vdr/xine-lib-vdr/src/liba52 Makefile.am Makefile.in a52.h a52_internal.h bit_allocate.c bitstream.c bitstream.h crc.c downmix.c imdct.c parse.c tables.h xine_decoder.c
Darren Salt
pkg-vdr-dvb-changes@lists.alioth.debian.org
Mon, 04 Apr 2005 22:29:48 +0000
Update of /cvsroot/pkg-vdr-dvb/vdr/xine-lib-vdr/src/liba52
In directory haydn:/tmp/cvs-serv2129/src/liba52
Added Files:
Makefile.am Makefile.in a52.h a52_internal.h bit_allocate.c
bitstream.c bitstream.h crc.c downmix.c imdct.c parse.c
tables.h xine_decoder.c
Log Message:
Import of VDR-patched xine-lib.
--- NEW FILE: Makefile.in ---
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host_cpu = @host_cpu@
host_os = @host_os@
host_vendor = @host_vendor@
includedir = @includedir@
infodir = @infodir@
install_sh = @install_sh@
libdir = $(XINE_PLUGINDIR)
libexecdir = @libexecdir@
localstatedir = @localstatedir@
mandir = @mandir@
mkdir_p = @mkdir_p@
oldincludedir = @oldincludedir@
prefix = @prefix@
program_transform_name = @program_transform_name@
sbindir = @sbindir@
sharedstatedir = @sharedstatedir@
sysconfdir = @sysconfdir@
target = @target@
target_alias = @target_alias@
target_cpu = @target_cpu@
target_os = @target_os@
target_vendor = @target_vendor@
w32_path = @w32_path@
XINE_LIB = $(top_builddir)/src/xine-engine/libxine.la
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crc.c \
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xineplug_decode_a52_la_LDFLAGS = -avoid-version -module @XINE_PLUGIN_MIN_SYMS@
noinst_HEADERS = \
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bitstream.h \
tables.h
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# Tell versions [3.59,3.63) of GNU make to not export all variables.
# Otherwise a system limit (for SysV at least) may be exceeded.
.NOEXPORT:
--- NEW FILE: xine_decoder.c ---
/*
* Copyright (C) 2000-2003 the xine project
*
* This file is part of xine, a free video player.
*
* xine is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* xine is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*
* $Id: xine_decoder.c,v 1.1 2005/04/04 22:29:46 dsalt-guest Exp $
*
* stuff needed to turn liba52 into a xine decoder plugin
*/
#ifndef __sun
/* required for swab() */
#define _XOPEN_SOURCE 500
#endif
/* avoid compiler warnings */
#define _BSD_SOURCE 1
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <assert.h>
#define LOG_MODULE "a52_decoder"
#define LOG_VERBOSE
/*
#define LOG
#define LOG_PTS
*/
#include "xine_internal.h"
#include "audio_out.h"
#include "a52.h"
#include "a52_internal.h"
#include "buffer.h"
#include "xineutils.h"
#undef DEBUG_A52
#ifdef DEBUG_A52
int a52file;
#endif
typedef struct {
audio_decoder_class_t decoder_class;
config_values_t *config;
float a52_level;
int disable_dynrng_compress;
int enable_surround_downmix;
} a52dec_class_t;
typedef struct a52dec_decoder_s {
audio_decoder_t audio_decoder;
a52dec_class_t *class;
xine_stream_t *stream;
int64_t pts;
int64_t pts_list[5];
int32_t pts_list_position;
uint8_t frame_buffer[3840];
uint8_t *frame_ptr;
int sync_state;
int frame_length, frame_todo;
uint16_t syncword;
a52_state_t *a52_state;
int a52_flags;
int a52_bit_rate;
int a52_sample_rate;
int have_lfe;
int a52_flags_map[11];
int ao_flags_map[11];
int audio_caps;
int bypass_mode;
int output_sampling_rate;
int output_open;
int output_mode;
} a52dec_decoder_t;
struct frmsize_s
{
uint16_t bit_rate;
uint16_t frm_size[3];
};
static const struct frmsize_s frmsizecod_tbl[64] =
{
{ 32 ,{64 ,69 ,96 } },
{ 32 ,{64 ,70 ,96 } },
{ 40 ,{80 ,87 ,120 } },
{ 40 ,{80 ,88 ,120 } },
{ 48 ,{96 ,104 ,144 } },
{ 48 ,{96 ,105 ,144 } },
{ 56 ,{112 ,121 ,168 } },
{ 56 ,{112 ,122 ,168 } },
{ 64 ,{128 ,139 ,192 } },
{ 64 ,{128 ,140 ,192 } },
{ 80 ,{160 ,174 ,240 } },
{ 80 ,{160 ,175 ,240 } },
{ 96 ,{192 ,208 ,288 } },
{ 96 ,{192 ,209 ,288 } },
{ 112 ,{224 ,243 ,336 } },
{ 112 ,{224 ,244 ,336 } },
{ 128 ,{256 ,278 ,384 } },
{ 128 ,{256 ,279 ,384 } },
{ 160 ,{320 ,348 ,480 } },
{ 160 ,{320 ,349 ,480 } },
{ 192 ,{384 ,417 ,576 } },
{ 192 ,{384 ,418 ,576 } },
{ 224 ,{448 ,487 ,672 } },
{ 224 ,{448 ,488 ,672 } },
{ 256 ,{512 ,557 ,768 } },
{ 256 ,{512 ,558 ,768 } },
{ 320 ,{640 ,696 ,960 } },
{ 320 ,{640 ,697 ,960 } },
{ 384 ,{768 ,835 ,1152 } },
{ 384 ,{768 ,836 ,1152 } },
{ 448 ,{896 ,975 ,1344 } },
{ 448 ,{896 ,976 ,1344 } },
{ 512 ,{1024 ,1114 ,1536 } },
{ 512 ,{1024 ,1115 ,1536 } },
{ 576 ,{1152 ,1253 ,1728 } },
{ 576 ,{1152 ,1254 ,1728 } },
{ 640 ,{1280 ,1393 ,1920 } },
{ 640 ,{1280 ,1394 ,1920 } }
};
/* config callbacks */
static void a52_level_change_cb(void *this_gen, xine_cfg_entry_t *entry);
static void dynrng_compress_change_cb(void *this_gen, xine_cfg_entry_t *entry);
static void surround_downmix_change_cb(void *this_gen, xine_cfg_entry_t *entry);
static void a52dec_reset (audio_decoder_t *this_gen) {
a52dec_decoder_t *this = (a52dec_decoder_t *) this_gen;
this->syncword = 0;
this->sync_state = 0;
this->pts = 0;
this->pts_list[0] = 0;
this->pts_list_position = 0;
}
static void a52dec_discontinuity (audio_decoder_t *this_gen) {
a52dec_decoder_t *this = (a52dec_decoder_t *) this_gen;
this->pts = 0;
this->pts_list[0] = 0;
this->pts_list_position = 0;
}
static inline int16_t blah (int32_t i) {
if (i > 0x43c07fff)
return 32767;
else if (i < 0x43bf8000)
return -32768;
else
return i - 0x43c00000;
}
static inline void float_to_int (float * _f, int16_t * s16, int num_channels) {
int i;
int32_t * f = (int32_t *) _f; /* XXX assumes IEEE float format */
for (i = 0; i < 256; i++) {
s16[num_channels*i] = blah (f[i]);
}
}
static inline void mute_channel (int16_t * s16, int num_channels) {
int i;
for (i = 0; i < 256; i++) {
s16[num_channels*i] = 0;
}
}
static void a52dec_decode_frame (a52dec_decoder_t *this, int64_t pts, int preview_mode) {
int output_mode = AO_CAP_MODE_STEREO;
/*
* do we want to decode this frame in software?
*/
#ifdef LOG_PTS
printf("a52dec:decode_frame:pts=%lld\n",pts);
#endif
if (!this->bypass_mode) {
int a52_output_flags, i;
sample_t level = this->class->a52_level;
audio_buffer_t *buf;
int16_t *int_samples;
sample_t *samples = a52_samples(this->a52_state);
/*
* oki, decode this frame in software
*/
/* determine output mode */
a52_output_flags = this->a52_flags_map[this->a52_flags & A52_CHANNEL_MASK];
if (a52_frame (this->a52_state,
this->frame_buffer,
&a52_output_flags,
&level, 384)) {
xprintf (this->stream->xine, XINE_VERBOSITY_DEBUG, "liba52: a52_frame error\n");
return;
}
if (this->class->disable_dynrng_compress)
a52_dynrng (this->a52_state, NULL, NULL);
this->have_lfe = a52_output_flags & A52_LFE;
if (this->have_lfe)
if (this->audio_caps & AO_CAP_MODE_5_1CHANNEL) {
output_mode = AO_CAP_MODE_5_1CHANNEL;
} else if (this->audio_caps & AO_CAP_MODE_4_1CHANNEL) {
output_mode = AO_CAP_MODE_4_1CHANNEL;
} else {
xprintf(this->stream->xine, XINE_VERBOSITY_DEBUG, "liba52: WHAT DO I DO!!!\n");
output_mode = this->ao_flags_map[a52_output_flags];
}
else
output_mode = this->ao_flags_map[a52_output_flags];
/*
* (re-)open output device
*/
if (!this->output_open
|| (this->a52_sample_rate != this->output_sampling_rate)
|| (output_mode != this->output_mode)) {
if (this->output_open)
this->stream->audio_out->close (this->stream->audio_out, this->stream);
this->output_open = this->stream->audio_out->open (this->stream->audio_out,
this->stream, 16,
this->a52_sample_rate,
output_mode) ;
this->output_sampling_rate = this->a52_sample_rate;
this->output_mode = output_mode;
}
if (!this->output_open || preview_mode)
return;
/*
* decode a52 and convert/interleave samples
*/
buf = this->stream->audio_out->get_buffer (this->stream->audio_out);
int_samples = buf->mem;
buf->num_frames = 256*6;
for (i = 0; i < 6; i++) {
if (a52_block (this->a52_state)) {
xprintf (this->stream->xine, XINE_VERBOSITY_DEBUG, "liba52: a52_block error on audio channel %d\n", i);
#if 0
for(n=0;n<2000;n++) {
printf("%02x ",this->frame_buffer[n]);
if ((n % 32) == 0) printf("\n");
}
printf("\n");
#endif
buf->num_frames = 0;
break;
}
switch (output_mode) {
case AO_CAP_MODE_MONO:
float_to_int (&samples[0], int_samples+(i*256), 1);
break;
case AO_CAP_MODE_STEREO:
float_to_int (&samples[0*256], int_samples+(i*256*2), 2);
float_to_int (&samples[1*256], int_samples+(i*256*2)+1, 2);
break;
case AO_CAP_MODE_4CHANNEL:
float_to_int (&samples[0*256], int_samples+(i*256*4), 4); /* L */
float_to_int (&samples[1*256], int_samples+(i*256*4)+1, 4); /* R */
float_to_int (&samples[2*256], int_samples+(i*256*4)+2, 4); /* RL */
float_to_int (&samples[3*256], int_samples+(i*256*4)+3, 4); /* RR */
break;
case AO_CAP_MODE_4_1CHANNEL:
float_to_int (&samples[0*256], int_samples+(i*256*6)+5, 6); /* LFE */
float_to_int (&samples[1*256], int_samples+(i*256*6)+0, 6); /* L */
float_to_int (&samples[2*256], int_samples+(i*256*6)+1, 6); /* R */
float_to_int (&samples[3*256], int_samples+(i*256*6)+2, 6); /* RL */
float_to_int (&samples[4*256], int_samples+(i*256*6)+3, 6); /* RR */
mute_channel ( int_samples+(i*256*6)+4, 6); /* C */
break;
case AO_CAP_MODE_5CHANNEL:
float_to_int (&samples[0*256], int_samples+(i*256*6)+0, 6); /* L */
float_to_int (&samples[1*256], int_samples+(i*256*6)+4, 6); /* C */
float_to_int (&samples[2*256], int_samples+(i*256*6)+1, 6); /* R */
float_to_int (&samples[3*256], int_samples+(i*256*6)+2, 6); /* RL */
float_to_int (&samples[4*256], int_samples+(i*256*6)+3, 6); /* RR */
mute_channel ( int_samples+(i*256*6)+5, 6); /* LFE */
break;
case AO_CAP_MODE_5_1CHANNEL:
float_to_int (&samples[0*256], int_samples+(i*256*6)+5, 6); /* lfe */
float_to_int (&samples[1*256], int_samples+(i*256*6)+0, 6); /* L */
float_to_int (&samples[2*256], int_samples+(i*256*6)+4, 6); /* C */
float_to_int (&samples[3*256], int_samples+(i*256*6)+1, 6); /* R */
float_to_int (&samples[4*256], int_samples+(i*256*6)+2, 6); /* RL */
float_to_int (&samples[5*256], int_samples+(i*256*6)+3, 6); /* RR */
break;
default:
xprintf (this->stream->xine, XINE_VERBOSITY_DEBUG, "liba52: help - unsupported mode %08x\n", output_mode);
}
}
lprintf ("%d frames output\n", buf->num_frames);
/* output decoded samples */
buf->vpts = pts;
this->stream->audio_out->put_buffer (this->stream->audio_out, buf, this->stream);
} else {
/*
* loop through a52 data
*/
if (!this->output_open) {
int sample_rate, bit_rate, flags;
a52_syncinfo (this->frame_buffer, &flags, &sample_rate, &bit_rate);
this->output_open = this->stream->audio_out->open (this->stream->audio_out,
this->stream, 16,
sample_rate,
AO_CAP_MODE_A52) ;
this->output_mode = AO_CAP_MODE_A52;
}
if (this->output_open && !preview_mode) {
/* SPDIF Passthrough
* Build SPDIF Header and encaps the A52 audio data in it.
*/
uint32_t syncword, crc1, fscod,frmsizecod,bsid,bsmod,frame_size;
uint8_t *data_out,*data_in;
audio_buffer_t *buf = this->stream->audio_out->get_buffer (this->stream->audio_out);
data_in=(uint8_t *) this->frame_buffer;
data_out=(uint8_t *) buf->mem;
syncword = data_in[0] | (data_in[1] << 8);
crc1 = data_in[2] | (data_in[3] << 8);
fscod = (data_in[4] >> 6) & 0x3;
frmsizecod = data_in[4] & 0x3f;
bsid = (data_in[5] >> 3) & 0x1f;
bsmod = data_in[5] & 0x7; /* bsmod, stream = 0 */
frame_size = frmsizecod_tbl[frmsizecod].frm_size[fscod] ;
data_out[0] = 0x72; data_out[1] = 0xf8; /* spdif syncword */
data_out[2] = 0x1f; data_out[3] = 0x4e; /* .............. */
data_out[4] = 0x01; /* AC3 data */
data_out[5] = bsmod; /* bsmod, stream = 0 */
data_out[6] = (frame_size << 4) & 0xff; /* frame_size * 16 */
data_out[7] = ((frame_size ) >> 4) & 0xff;
swab(data_in, &data_out[8], frame_size * 2 );
buf->num_frames = 1536;
buf->vpts = pts;
this->stream->audio_out->put_buffer (this->stream->audio_out, buf, this->stream);
}
}
}
static void a52dec_decode_data (audio_decoder_t *this_gen, buf_element_t *buf) {
a52dec_decoder_t *this = (a52dec_decoder_t *) this_gen;
uint8_t *current = buf->content;
uint8_t *sync_start=current + 1;
uint8_t *end = buf->content + buf->size;
uint8_t byte;
int32_t n;
uint16_t crc16;
uint16_t crc16_result;
lprintf ("decode data %d bytes of type %08x, pts=%lld\n",
buf->size, buf->type, buf->pts);
lprintf ("decode data decoder_info=%d, %d\n",buf->decoder_info[1],buf->decoder_info[2]);
if (buf->decoder_flags & BUF_FLAG_HEADER)
return;
/* swap byte pairs if this is RealAudio DNET data */
if (buf->type == BUF_AUDIO_DNET) {
lprintf ("byte-swapping dnet\n");
while (current != end) {
byte = *current++;
*(current - 1) = *current;
*current++ = byte;
}
/* reset */
current = buf->content;
end = buf->content + buf->size;
}
/* A52 packs come from the DVD in blocks of about 2048 bytes.
* Only 1 PTS values can be assigned to each block.
* An A52 frame is about 1700 bytes long.
* So, a single A52 packs can contain 2 A52 frames (or the beginning of an A52 frame at least).
* If we have a PTS value, which A52 frame does it apply to? The A52 pack tells us that.
* So, the info about which A52 frame the PTS applies to is contained in decoder_info sent from the demuxer.
*
* The PTS value from the A52 pack (DVD sector) can only be applied at the start of an A52 frame.
* We call the start of an A52 frame a frame header.
* So, if a A52 pack has 2 "Number of frame headers" is means that the A52 pack contains 2 A52 frame headers.
* The "First access unit" then tells us which A52 frame the PTS value applies to.
*
* Take the following example: -
* PACK1: PTS = 10. Contains the entire A52 frame1, followed by the beginning of the frame2. PTS applies to frame1.
* PACK2: PTS = 1000, Contains the rest of frame2, and the whole of frame3. and the start of frame4. PTS applies to frame4.
* PACK3: PTS = 0 (none), Contains the rest of frame4.
*
* Output should be: -
* frame1, PTS=10
* frame2, PTS=0
* frame3, PTS=0
* frame4, PTS=1000
*
* So, we have to keep track of PTS values from previous A52 packs here, otherwise they get put on the wrong frame.
*/
/* FIXME: the code here does not match the explanation above */
if (buf->pts) {
int32_t info;
info = buf->decoder_info[1];
this->pts = buf->pts;
this->pts_list[this->pts_list_position]=buf->pts;
this->pts_list_position++;
if( this->pts_list_position > 3 )
this->pts_list_position = 3;
if (info == 2) {
this->pts_list[this->pts_list_position]=0;
this->pts_list_position++;
if( this->pts_list_position > 3 )
this->pts_list_position = 3;
}
}
#if 0
for(n=0;n < buf->size;n++) {
if ((n % 32) == 0) printf("\n");
printf("%x ", current[n]);
}
printf("\n");
#endif
lprintf ("processing...state %d\n", this->sync_state);
while (current < end) {
switch (this->sync_state) {
case 0: /* Looking for sync header */
this->syncword = (this->syncword << 8) | *current++;
if (this->syncword == 0x0b77) {
this->frame_buffer[0] = 0x0b;
this->frame_buffer[1] = 0x77;
this->sync_state = 1;
this->frame_ptr = this->frame_buffer+2;
}
break;
case 1: /* Looking for enough bytes for sync_info. */
sync_start = current - 1;
*this->frame_ptr++ = *current++;
if ((this->frame_ptr - this->frame_buffer) > 16) {
int a52_flags_old = this->a52_flags;
int a52_sample_rate_old = this->a52_sample_rate;
int a52_bit_rate_old = this->a52_bit_rate;
this->frame_length = a52_syncinfo (this->frame_buffer,
&this->a52_flags,
&this->a52_sample_rate,
&this->a52_bit_rate);
if (this->frame_length < 80) { /* Invalid a52 frame_length */
this->syncword = 0;
current = sync_start;
this->sync_state = 0;
break;
}
lprintf("Frame length = %d\n",this->frame_length);
this->frame_todo = this->frame_length - 17;
this->sync_state = 2;
if (!_x_meta_info_get(this->stream, XINE_META_INFO_AUDIOCODEC) ||
a52_flags_old != this->a52_flags ||
a52_sample_rate_old != this->a52_sample_rate ||
a52_bit_rate_old != this->a52_bit_rate) {
if (((this->a52_flags & A52_CHANNEL_MASK) == A52_3F2R) && (this->a52_flags & A52_LFE))
_x_meta_info_set_utf8(this->stream, XINE_META_INFO_AUDIOCODEC, "A/52 5.1");
else if ((((this->a52_flags & A52_CHANNEL_MASK) == A52_2F2R) && (this->a52_flags & A52_LFE)) ||
(((this->a52_flags & A52_CHANNEL_MASK) == A52_3F1R) && (this->a52_flags & A52_LFE)))
_x_meta_info_set_utf8(this->stream, XINE_META_INFO_AUDIOCODEC, "A/52 4.1");
else if ((this->a52_flags & A52_CHANNEL_MASK) == A52_3F2R)
_x_meta_info_set_utf8(this->stream, XINE_META_INFO_AUDIOCODEC, "A/52 5.0");
else if (((this->a52_flags & A52_CHANNEL_MASK) == A52_2F2R) ||
((this->a52_flags & A52_CHANNEL_MASK) == A52_3F1R))
_x_meta_info_set_utf8(this->stream, XINE_META_INFO_AUDIOCODEC, "A/52 4.0");
else if (((this->a52_flags & A52_CHANNEL_MASK) == A52_2F1R) ||
((this->a52_flags & A52_CHANNEL_MASK) == A52_3F))
_x_meta_info_set_utf8(this->stream, XINE_META_INFO_AUDIOCODEC, "A/52 3.0");
else if ((this->a52_flags & A52_CHANNEL_MASK) == A52_STEREO)
_x_meta_info_set_utf8(this->stream, XINE_META_INFO_AUDIOCODEC, "A/52 2.0 (stereo)");
else if ((this->a52_flags & A52_CHANNEL_MASK) == A52_DOLBY)
_x_meta_info_set_utf8(this->stream, XINE_META_INFO_AUDIOCODEC, "A/52 2.0 (dolby)");
else if ((this->a52_flags & A52_CHANNEL_MASK) == A52_MONO)
_x_meta_info_set_utf8(this->stream, XINE_META_INFO_AUDIOCODEC, "A/52 1.0");
else
_x_meta_info_set_utf8(this->stream, XINE_META_INFO_AUDIOCODEC, "A/52");
_x_stream_info_set(this->stream, XINE_STREAM_INFO_AUDIO_BITRATE, this->a52_bit_rate);
_x_stream_info_set(this->stream, XINE_STREAM_INFO_AUDIO_SAMPLERATE, this->a52_sample_rate);
}
}
break;
case 2: /* Filling frame_buffer with sync_info bytes */
*this->frame_ptr++ = *current++;
this->frame_todo--;
if (this->frame_todo < 1) {
this->sync_state = 3;
} else break;
case 3: /* Ready for decode */
crc16 = (uint16_t) ((this->frame_buffer[2] << 8) | this->frame_buffer[3]) ;
crc16_result = crc16_block(&this->frame_buffer[2], this->frame_length - 2) ; /* frame_length */
if (crc16_result != 0) { /* CRC16 failed */
xprintf(this->stream->xine, XINE_VERBOSITY_DEBUG, "liba52:a52 frame failed crc16 checksum.\n");
current = sync_start;
this->pts = 0;
this->syncword = 0;
this->sync_state = 0;
break;
}
#if 0
a52dec_decode_frame (this, this->pts_list[0], buf->decoder_flags & BUF_FLAG_PREVIEW);
#else
a52dec_decode_frame (this, this->pts, buf->decoder_flags & BUF_FLAG_PREVIEW);
#endif
for(n=0;n<4;n++) {
this->pts_list[n] = this->pts_list[n+1];
}
this->pts_list_position--;
if( this->pts_list_position < 0 )
this->pts_list_position = 0;
#if 0
printf("liba52: pts_list = %lld, %lld, %lld\n",
this->pts_list[0],
this->pts_list[1],
this->pts_list[2]);
#endif
case 4: /* Clear up ready for next frame */
this->pts = 0;
this->syncword = 0;
this->sync_state = 0;
break;
default: /* No come here */
break;
}
}
#ifdef DEBUG_A52
write (a52file, this->frame_buffer, this->frame_length);
#endif
}
static void a52dec_dispose (audio_decoder_t *this_gen) {
a52dec_decoder_t *this = (a52dec_decoder_t *) this_gen;
if (this->output_open)
this->stream->audio_out->close (this->stream->audio_out, this->stream);
this->output_open = 0;
a52_free(this->a52_state);
this->a52_state = NULL;
#ifdef DEBUG_A52
close (a52file);
#endif
free (this_gen);
}
static audio_decoder_t *open_plugin (audio_decoder_class_t *class_gen, xine_stream_t *stream) {
a52dec_decoder_t *this ;
lprintf ("open_plugin called\n");
this = (a52dec_decoder_t *) xine_xmalloc (sizeof (a52dec_decoder_t));
this->audio_decoder.decode_data = a52dec_decode_data;
this->audio_decoder.reset = a52dec_reset;
this->audio_decoder.discontinuity = a52dec_discontinuity;
this->audio_decoder.dispose = a52dec_dispose;
this->stream = stream;
this->class = (a52dec_class_t *) class_gen;
/* int i; */
this->audio_caps = stream->audio_out->get_capabilities(stream->audio_out);
this->syncword = 0;
this->sync_state = 0;
this->output_open = 0;
this->pts = 0;
this->pts_list[0] = 0;
this->pts_list_position = 0;
if( !this->a52_state )
this->a52_state = a52_init (xine_mm_accel());
/*
* find out if this driver supports a52 output
* or, if not, how many channels we've got
*/
if (this->audio_caps & AO_CAP_MODE_A52)
this->bypass_mode = 1;
else {
this->bypass_mode = 0;
this->a52_flags_map[A52_MONO] = A52_MONO;
this->a52_flags_map[A52_STEREO] = ((this->class->enable_surround_downmix ? A52_DOLBY : A52_STEREO));
this->a52_flags_map[A52_3F] = ((this->class->enable_surround_downmix ? A52_DOLBY : A52_STEREO));
this->a52_flags_map[A52_2F1R] = ((this->class->enable_surround_downmix ? A52_DOLBY : A52_STEREO));
this->a52_flags_map[A52_3F1R] = ((this->class->enable_surround_downmix ? A52_DOLBY : A52_STEREO));
this->a52_flags_map[A52_2F2R] = ((this->class->enable_surround_downmix ? A52_DOLBY : A52_STEREO));
this->a52_flags_map[A52_3F2R] = ((this->class->enable_surround_downmix ? A52_DOLBY : A52_STEREO));
this->a52_flags_map[A52_DOLBY] = ((this->class->enable_surround_downmix ? A52_DOLBY : A52_STEREO));
this->ao_flags_map[A52_MONO] = AO_CAP_MODE_MONO;
this->ao_flags_map[A52_STEREO] = AO_CAP_MODE_STEREO;
this->ao_flags_map[A52_3F] = AO_CAP_MODE_STEREO;
this->ao_flags_map[A52_2F1R] = AO_CAP_MODE_STEREO;
this->ao_flags_map[A52_3F1R] = AO_CAP_MODE_STEREO;
this->ao_flags_map[A52_2F2R] = AO_CAP_MODE_STEREO;
this->ao_flags_map[A52_3F2R] = AO_CAP_MODE_STEREO;
this->ao_flags_map[A52_DOLBY] = AO_CAP_MODE_STEREO;
/* find best mode */
if (this->audio_caps & AO_CAP_MODE_5_1CHANNEL) {
this->a52_flags_map[A52_2F2R] = A52_2F2R;
this->a52_flags_map[A52_3F2R] = A52_3F2R | A52_LFE;
this->ao_flags_map[A52_2F2R] = AO_CAP_MODE_4CHANNEL;
this->ao_flags_map[A52_3F2R] = AO_CAP_MODE_5CHANNEL;
} else if (this->audio_caps & AO_CAP_MODE_5CHANNEL) {
this->a52_flags_map[A52_2F2R] = A52_2F2R;
this->a52_flags_map[A52_3F2R] = A52_3F2R;
this->ao_flags_map[A52_2F2R] = AO_CAP_MODE_4CHANNEL;
this->ao_flags_map[A52_3F2R] = AO_CAP_MODE_5CHANNEL;
} else if (this->audio_caps & AO_CAP_MODE_4_1CHANNEL) {
this->a52_flags_map[A52_2F2R] = A52_2F2R;
this->a52_flags_map[A52_3F2R] = A52_2F2R | A52_LFE;
this->ao_flags_map[A52_2F2R] = AO_CAP_MODE_4CHANNEL;
this->ao_flags_map[A52_3F2R] = AO_CAP_MODE_4CHANNEL;
} else if (this->audio_caps & AO_CAP_MODE_4CHANNEL) {
this->a52_flags_map[A52_2F2R] = A52_2F2R;
this->a52_flags_map[A52_3F2R] = A52_2F2R;
this->ao_flags_map[A52_2F2R] = AO_CAP_MODE_4CHANNEL;
this->ao_flags_map[A52_3F2R] = AO_CAP_MODE_4CHANNEL;
/* else if (this->audio_caps & AO_CAP_MODE_STEREO)
defaults are ok */
} else if (!(this->audio_caps & AO_CAP_MODE_STEREO)) {
xprintf (this->stream->xine, XINE_VERBOSITY_LOG, _("HELP! a mono-only audio driver?!\n"));
this->a52_flags_map[A52_MONO] = A52_MONO;
this->a52_flags_map[A52_STEREO] = A52_MONO;
this->a52_flags_map[A52_3F] = A52_MONO;
this->a52_flags_map[A52_2F1R] = A52_MONO;
this->a52_flags_map[A52_3F1R] = A52_MONO;
this->a52_flags_map[A52_2F2R] = A52_MONO;
this->a52_flags_map[A52_3F2R] = A52_MONO;
this->a52_flags_map[A52_DOLBY] = A52_MONO;
this->ao_flags_map[A52_MONO] = AO_CAP_MODE_MONO;
this->ao_flags_map[A52_STEREO] = AO_CAP_MODE_MONO;
this->ao_flags_map[A52_3F] = AO_CAP_MODE_MONO;
this->ao_flags_map[A52_2F1R] = AO_CAP_MODE_MONO;
this->ao_flags_map[A52_3F1R] = AO_CAP_MODE_MONO;
this->ao_flags_map[A52_2F2R] = AO_CAP_MODE_MONO;
this->ao_flags_map[A52_3F2R] = AO_CAP_MODE_MONO;
this->ao_flags_map[A52_DOLBY] = AO_CAP_MODE_MONO;
}
}
/*
for (i = 0; i<8; i++)
this->a52_flags_map[i] |= A52_ADJUST_LEVEL;
*/
#ifdef DEBUG_A52
a52file = open ("test.a52", O_CREAT | O_WRONLY | O_TRUNC, 0644);
#endif
return &this->audio_decoder;
}
static char *get_identifier (audio_decoder_class_t *this) {
lprintf ("get_identifier called\n");
return "a/52dec";
}
static char *get_description (audio_decoder_class_t *this) {
lprintf ("get_description called\n");
return "liba52 based a52 audio decoder plugin";
}
static void dispose_class (audio_decoder_class_t *this) {
lprintf ("dispose_class called\n");
free (this);
}
static void *init_plugin (xine_t *xine, void *data) {
a52dec_class_t *this;
config_values_t *cfg;
this = (a52dec_class_t *) xine_xmalloc (sizeof (a52dec_class_t));
this->decoder_class.open_plugin = open_plugin;
this->decoder_class.get_identifier = get_identifier;
this->decoder_class.get_description = get_description;
this->decoder_class.dispose = dispose_class;
cfg = this->config = xine->config;
this->a52_level = (float) cfg->register_range (cfg, "audio.a52.level", 100,
0, 200,
_("A/52 volume"),
_("With A/52 audio, you can modify the volume "
"at the decoder level. This has the advantage "
"of the audio being already decoded for the "
"specified volume, so later operations like "
"channel downmixing will work on an audio stream "
"of the given volume."),
10, a52_level_change_cb, this) / 100.0;
this->disable_dynrng_compress = !cfg->register_bool (cfg, "audio.a52.dynamic_range", 0,
_("use A/52 dynamic range compression"),
_("Dynamic range compression limits the dynamic "
"range of the audio. This means making the loud "
"sounds softer, and the soft sounds louder, so you can "
"more easily listen to the audio in a noisy "
"environment without disturbing anyone."),
0, dynrng_compress_change_cb, this);
this->enable_surround_downmix = cfg->register_bool (cfg, "audio.a52.surround_downmix", 0,
_("downmix audio to 2 channel surround stereo"),
_("When you want to listen to multichannel surround "
"sound, but you have only two speakers or a "
"surround decoder or amplifier which does some "
"sort of matrix surround decoding like prologic, "
"you should enable this option so that the "
"additional channels are mixed into the stereo "
"signal."),
0, surround_downmix_change_cb, this);
lprintf ("init_plugin called\n");
return this;
}
static void a52_level_change_cb(void *this_gen, xine_cfg_entry_t *entry)
{
((a52dec_class_t *)this_gen)->a52_level = entry->num_value / 100.0;
}
static void dynrng_compress_change_cb(void *this_gen, xine_cfg_entry_t *entry)
{
((a52dec_class_t *)this_gen)->disable_dynrng_compress = !entry->num_value;
}
static void surround_downmix_change_cb(void *this_gen, xine_cfg_entry_t *entry)
{
((a52dec_class_t *)this_gen)->enable_surround_downmix = entry->num_value;
}
static uint32_t audio_types[] = {
BUF_AUDIO_A52,
BUF_AUDIO_DNET,
0
};
static decoder_info_t dec_info_audio = {
audio_types, /* supported types */
5 /* priority */
};
plugin_info_t xine_plugin_info[] = {
/* type, API, "name", version, special_info, init_function */
{ PLUGIN_AUDIO_DECODER | PLUGIN_MUST_PRELOAD, 15, "a/52", XINE_VERSION_CODE, &dec_info_audio, init_plugin },
{ PLUGIN_NONE, 0, "", 0, NULL, NULL }
};
--- NEW FILE: a52.h ---
/*
* a52.h
* Copyright (C) 2000-2002 Michel Lespinasse <walken@zoy.org>
* Copyright (C) 1999-2000 Aaron Holtzman <aholtzma@ess.engr.uvic.ca>
*
* This file is part of a52dec, a free ATSC A-52 stream decoder.
* See http://liba52.sourceforge.net/ for updates.
*
* a52dec is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* a52dec is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef A52_H
#define A52_H
#ifndef LIBA52_DOUBLE
typedef float sample_t;
#else
typedef double sample_t;
#endif
typedef struct a52_state_s a52_state_t;
#define A52_CHANNEL 0
#define A52_MONO 1
#define A52_STEREO 2
#define A52_3F 3
#define A52_2F1R 4
#define A52_3F1R 5
#define A52_2F2R 6
#define A52_3F2R 7
#define A52_CHANNEL1 8
#define A52_CHANNEL2 9
#define A52_DOLBY 10
#define A52_CHANNEL_MASK 15
#define A52_LFE 16
#define A52_ADJUST_LEVEL 32
a52_state_t * a52_init (uint32_t mm_accel);
sample_t * a52_samples (a52_state_t * state);
int a52_syncinfo (uint8_t * buf, int * flags,
int * sample_rate, int * bit_rate);
int a52_frame (a52_state_t * state, uint8_t * buf, int * flags,
sample_t * level, sample_t bias);
void a52_dynrng (a52_state_t * state,
sample_t (* call) (sample_t, void *), void * data);
int a52_block (a52_state_t * state);
void a52_free (a52_state_t * state);
uint16_t crc16_block(uint8_t *data,uint32_t num_bytes);
#endif /* A52_H */
--- NEW FILE: imdct.c ---
/*
* imdct.c
* Copyright (C) 2000-2002 Michel Lespinasse <walken@zoy.org>
* Copyright (C) 1999-2000 Aaron Holtzman <aholtzma@ess.engr.uvic.ca>
*
* The ifft algorithms in this file have been largely inspired by Dan
* Bernstein's work, djbfft, available at http://cr.yp.to/djbfft.html
*
* This file is part of a52dec, a free ATSC A-52 stream decoder.
* See http://liba52.sourceforge.net/ for updates.
*
* a52dec is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* a52dec is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "config.h"
#include <math.h>
#include <stdio.h>
#ifdef LIBA52_DJBFFT
#include <fftc4.h>
#endif
#ifndef M_PI
#define M_PI 3.1415926535897932384626433832795029
#endif
#include <inttypes.h>
#include "a52.h"
#include "a52_internal.h"
#include "xineutils.h"
typedef struct complex_s {
sample_t real;
sample_t imag;
} complex_t;
static uint8_t fftorder[] = {
0,128, 64,192, 32,160,224, 96, 16,144, 80,208,240,112, 48,176,
8,136, 72,200, 40,168,232,104,248,120, 56,184, 24,152,216, 88,
4,132, 68,196, 36,164,228,100, 20,148, 84,212,244,116, 52,180,
252,124, 60,188, 28,156,220, 92, 12,140, 76,204,236,108, 44,172,
2,130, 66,194, 34,162,226, 98, 18,146, 82,210,242,114, 50,178,
10,138, 74,202, 42,170,234,106,250,122, 58,186, 26,154,218, 90,
254,126, 62,190, 30,158,222, 94, 14,142, 78,206,238,110, 46,174,
6,134, 70,198, 38,166,230,102,246,118, 54,182, 22,150,214, 86
};
/* Root values for IFFT */
static sample_t roots16[3];
static sample_t roots32[7];
static sample_t roots64[15];
static sample_t roots128[31];
/* Twiddle factors for IMDCT */
static complex_t pre1[128];
static complex_t post1[64];
static complex_t pre2[64];
static complex_t post2[32];
static sample_t a52_imdct_window[256];
static void (* ifft128) (complex_t * buf);
static void (* ifft64) (complex_t * buf);
static inline void ifft2 (complex_t * buf)
{
double r, i;
r = buf[0].real;
i = buf[0].imag;
buf[0].real += buf[1].real;
buf[0].imag += buf[1].imag;
buf[1].real = r - buf[1].real;
buf[1].imag = i - buf[1].imag;
}
static inline void ifft4 (complex_t * buf)
{
double tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7, tmp8;
tmp1 = buf[0].real + buf[1].real;
tmp2 = buf[3].real + buf[2].real;
tmp3 = buf[0].imag + buf[1].imag;
tmp4 = buf[2].imag + buf[3].imag;
tmp5 = buf[0].real - buf[1].real;
tmp6 = buf[0].imag - buf[1].imag;
tmp7 = buf[2].imag - buf[3].imag;
tmp8 = buf[3].real - buf[2].real;
buf[0].real = tmp1 + tmp2;
buf[0].imag = tmp3 + tmp4;
buf[2].real = tmp1 - tmp2;
buf[2].imag = tmp3 - tmp4;
buf[1].real = tmp5 + tmp7;
buf[1].imag = tmp6 + tmp8;
buf[3].real = tmp5 - tmp7;
buf[3].imag = tmp6 - tmp8;
}
/* the basic split-radix ifft butterfly */
#define BUTTERFLY(a0,a1,a2,a3,wr,wi) do { \
tmp5 = a2.real * wr + a2.imag * wi; \
tmp6 = a2.imag * wr - a2.real * wi; \
tmp7 = a3.real * wr - a3.imag * wi; \
tmp8 = a3.imag * wr + a3.real * wi; \
tmp1 = tmp5 + tmp7; \
tmp2 = tmp6 + tmp8; \
tmp3 = tmp6 - tmp8; \
tmp4 = tmp7 - tmp5; \
a2.real = a0.real - tmp1; \
a2.imag = a0.imag - tmp2; \
a3.real = a1.real - tmp3; \
a3.imag = a1.imag - tmp4; \
a0.real += tmp1; \
a0.imag += tmp2; \
a1.real += tmp3; \
a1.imag += tmp4; \
} while (0)
/* split-radix ifft butterfly, specialized for wr=1 wi=0 */
#define BUTTERFLY_ZERO(a0,a1,a2,a3) do { \
tmp1 = a2.real + a3.real; \
tmp2 = a2.imag + a3.imag; \
tmp3 = a2.imag - a3.imag; \
tmp4 = a3.real - a2.real; \
a2.real = a0.real - tmp1; \
a2.imag = a0.imag - tmp2; \
a3.real = a1.real - tmp3; \
a3.imag = a1.imag - tmp4; \
a0.real += tmp1; \
a0.imag += tmp2; \
a1.real += tmp3; \
a1.imag += tmp4; \
} while (0)
/* split-radix ifft butterfly, specialized for wr=wi */
#define BUTTERFLY_HALF(a0,a1,a2,a3,w) do { \
tmp5 = (a2.real + a2.imag) * w; \
tmp6 = (a2.imag - a2.real) * w; \
tmp7 = (a3.real - a3.imag) * w; \
tmp8 = (a3.imag + a3.real) * w; \
tmp1 = tmp5 + tmp7; \
tmp2 = tmp6 + tmp8; \
tmp3 = tmp6 - tmp8; \
tmp4 = tmp7 - tmp5; \
a2.real = a0.real - tmp1; \
a2.imag = a0.imag - tmp2; \
a3.real = a1.real - tmp3; \
a3.imag = a1.imag - tmp4; \
a0.real += tmp1; \
a0.imag += tmp2; \
a1.real += tmp3; \
a1.imag += tmp4; \
} while (0)
static inline void ifft8 (complex_t * buf)
{
double tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7, tmp8;
ifft4 (buf);
ifft2 (buf + 4);
ifft2 (buf + 6);
BUTTERFLY_ZERO (buf[0], buf[2], buf[4], buf[6]);
BUTTERFLY_HALF (buf[1], buf[3], buf[5], buf[7], roots16[1]);
}
static void ifft_pass (complex_t * buf, sample_t * weight, int n)
{
complex_t * buf1;
complex_t * buf2;
complex_t * buf3;
double tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7, tmp8;
int i;
buf++;
buf1 = buf + n;
buf2 = buf + 2 * n;
buf3 = buf + 3 * n;
BUTTERFLY_ZERO (buf[-1], buf1[-1], buf2[-1], buf3[-1]);
i = n - 1;
do {
BUTTERFLY (buf[0], buf1[0], buf2[0], buf3[0], weight[n], weight[2*i]);
buf++;
buf1++;
buf2++;
buf3++;
weight++;
} while (--i);
}
static void ifft16 (complex_t * buf)
{
ifft8 (buf);
ifft4 (buf + 8);
ifft4 (buf + 12);
ifft_pass (buf, roots16 - 4, 4);
}
static void ifft32 (complex_t * buf)
{
ifft16 (buf);
ifft8 (buf + 16);
ifft8 (buf + 24);
ifft_pass (buf, roots32 - 8, 8);
}
static void ifft64_c (complex_t * buf)
{
ifft32 (buf);
ifft16 (buf + 32);
ifft16 (buf + 48);
ifft_pass (buf, roots64 - 16, 16);
}
static void ifft128_c (complex_t * buf)
{
ifft32 (buf);
ifft16 (buf + 32);
ifft16 (buf + 48);
ifft_pass (buf, roots64 - 16, 16);
ifft32 (buf + 64);
ifft32 (buf + 96);
ifft_pass (buf, roots128 - 32, 32);
}
void a52_imdct_512 (sample_t * data, sample_t * delay, sample_t bias)
{
int i, k;
sample_t t_r, t_i, a_r, a_i, b_r, b_i, w_1, w_2;
const sample_t * window = a52_imdct_window;
complex_t buf[128];
for (i = 0; i < 128; i++) {
k = fftorder[i];
t_r = pre1[i].real;
t_i = pre1[i].imag;
buf[i].real = t_i * data[255-k] + t_r * data[k];
buf[i].imag = t_r * data[255-k] - t_i * data[k];
}
ifft128 (buf);
/* Post IFFT complex multiply plus IFFT complex conjugate*/
/* Window and convert to real valued signal */
for (i = 0; i < 64; i++) {
/* y[n] = z[n] * (xcos1[n] + j * xsin1[n]) ; */
t_r = post1[i].real;
t_i = post1[i].imag;
a_r = t_r * buf[i].real + t_i * buf[i].imag;
a_i = t_i * buf[i].real - t_r * buf[i].imag;
b_r = t_i * buf[127-i].real + t_r * buf[127-i].imag;
b_i = t_r * buf[127-i].real - t_i * buf[127-i].imag;
w_1 = window[2*i];
w_2 = window[255-2*i];
data[2*i] = delay[2*i] * w_2 - a_r * w_1 + bias;
data[255-2*i] = delay[2*i] * w_1 + a_r * w_2 + bias;
delay[2*i] = a_i;
w_1 = window[2*i+1];
w_2 = window[254-2*i];
data[2*i+1] = delay[2*i+1] * w_2 + b_r * w_1 + bias;
data[254-2*i] = delay[2*i+1] * w_1 - b_r * w_2 + bias;
delay[2*i+1] = b_i;
}
}
void a52_imdct_256(sample_t * data, sample_t * delay, sample_t bias)
{
int i, k;
sample_t t_r, t_i, a_r, a_i, b_r, b_i, c_r, c_i, d_r, d_i, w_1, w_2;
const sample_t * window = a52_imdct_window;
complex_t buf1[64], buf2[64];
/* Pre IFFT complex multiply plus IFFT cmplx conjugate */
for (i = 0; i < 64; i++) {
k = fftorder[i];
t_r = pre2[i].real;
t_i = pre2[i].imag;
buf1[i].real = t_i * data[254-k] + t_r * data[k];
buf1[i].imag = t_r * data[254-k] - t_i * data[k];
buf2[i].real = t_i * data[255-k] + t_r * data[k+1];
buf2[i].imag = t_r * data[255-k] - t_i * data[k+1];
}
ifft64 (buf1);
ifft64 (buf2);
/* Post IFFT complex multiply */
/* Window and convert to real valued signal */
for (i = 0; i < 32; i++) {
/* y1[n] = z1[n] * (xcos2[n] + j * xs in2[n]) ; */
t_r = post2[i].real;
t_i = post2[i].imag;
a_r = t_r * buf1[i].real + t_i * buf1[i].imag;
a_i = t_i * buf1[i].real - t_r * buf1[i].imag;
b_r = t_i * buf1[63-i].real + t_r * buf1[63-i].imag;
b_i = t_r * buf1[63-i].real - t_i * buf1[63-i].imag;
c_r = t_r * buf2[i].real + t_i * buf2[i].imag;
c_i = t_i * buf2[i].real - t_r * buf2[i].imag;
d_r = t_i * buf2[63-i].real + t_r * buf2[63-i].imag;
d_i = t_r * buf2[63-i].real - t_i * buf2[63-i].imag;
w_1 = window[2*i];
w_2 = window[255-2*i];
data[2*i] = delay[2*i] * w_2 - a_r * w_1 + bias;
data[255-2*i] = delay[2*i] * w_1 + a_r * w_2 + bias;
delay[2*i] = c_i;
w_1 = window[128+2*i];
w_2 = window[127-2*i];
data[128+2*i] = delay[127-2*i] * w_2 + a_i * w_1 + bias;
data[127-2*i] = delay[127-2*i] * w_1 - a_i * w_2 + bias;
delay[127-2*i] = c_r;
w_1 = window[2*i+1];
w_2 = window[254-2*i];
data[2*i+1] = delay[2*i+1] * w_2 - b_i * w_1 + bias;
data[254-2*i] = delay[2*i+1] * w_1 + b_i * w_2 + bias;
delay[2*i+1] = d_r;
w_1 = window[129+2*i];
w_2 = window[126-2*i];
data[129+2*i] = delay[126-2*i] * w_2 + b_r * w_1 + bias;
data[126-2*i] = delay[126-2*i] * w_1 - b_r * w_2 + bias;
delay[126-2*i] = d_i;
}
}
static double besselI0 (double x)
{
double bessel = 1;
int i = 100;
do
bessel = bessel * x / (i * i) + 1;
while (--i);
return bessel;
}
void a52_imdct_init (uint32_t mm_accel)
{
int i, k;
double sum;
/* compute imdct window - kaiser-bessel derived window, alpha = 5.0 */
sum = 0;
for (i = 0; i < 256; i++) {
sum += besselI0 (i * (256 - i) * (5 * M_PI / 256) * (5 * M_PI / 256));
a52_imdct_window[i] = sum;
}
sum++;
for (i = 0; i < 256; i++)
a52_imdct_window[i] = sqrt (a52_imdct_window[i] / sum);
for (i = 0; i < 3; i++)
roots16[i] = cos ((M_PI / 8) * (i + 1));
for (i = 0; i < 7; i++)
roots32[i] = cos ((M_PI / 16) * (i + 1));
for (i = 0; i < 15; i++)
roots64[i] = cos ((M_PI / 32) * (i + 1));
for (i = 0; i < 31; i++)
roots128[i] = cos ((M_PI / 64) * (i + 1));
for (i = 0; i < 64; i++) {
k = fftorder[i] / 2 + 64;
pre1[i].real = cos ((M_PI / 256) * (k - 0.25));
pre1[i].imag = sin ((M_PI / 256) * (k - 0.25));
}
for (i = 64; i < 128; i++) {
k = fftorder[i] / 2 + 64;
pre1[i].real = -cos ((M_PI / 256) * (k - 0.25));
pre1[i].imag = -sin ((M_PI / 256) * (k - 0.25));
}
for (i = 0; i < 64; i++) {
post1[i].real = cos ((M_PI / 256) * (i + 0.5));
post1[i].imag = sin ((M_PI / 256) * (i + 0.5));
}
for (i = 0; i < 64; i++) {
k = fftorder[i] / 4;
pre2[i].real = cos ((M_PI / 128) * (k - 0.25));
pre2[i].imag = sin ((M_PI / 128) * (k - 0.25));
}
for (i = 0; i < 32; i++) {
post2[i].real = cos ((M_PI / 128) * (i + 0.5));
post2[i].imag = sin ((M_PI / 128) * (i + 0.5));
}
#ifdef LIBA52_DJBFFT
if (mm_accel & MM_ACCEL_DJBFFT) {
fprintf (stderr, "liba52:Using djbfft for IMDCT transform\n");
ifft128 = (void (*) (complex_t *)) fftc4_un128;
ifft64 = (void (*) (complex_t *)) fftc4_un64;
} else
#endif
{
ifft128 = ifft128_c;
ifft64 = ifft64_c;
}
}
--- NEW FILE: Makefile.am ---
include $(top_srcdir)/misc/Makefile.common
libdir = $(XINE_PLUGINDIR)
lib_LTLIBRARIES = xineplug_decode_a52.la
xineplug_decode_a52_la_SOURCES = \
bitstream.c \
bit_allocate.c \
crc.c \
downmix.c \
imdct.c \
parse.c \
xine_decoder.c
xineplug_decode_a52_la_LIBADD = $(XINE_LIB)
xineplug_decode_a52_la_LDFLAGS = -avoid-version -module @XINE_PLUGIN_MIN_SYMS@
noinst_HEADERS = \
a52.h \
a52_internal.h \
bitstream.h \
tables.h
--- NEW FILE: tables.h ---
/*
* tables.h
* Copyright (C) 2000-2002 Michel Lespinasse <walken@zoy.org>
* Copyright (C) 1999-2000 Aaron Holtzman <aholtzma@ess.engr.uvic.ca>
*
* This file is part of a52dec, a free ATSC A-52 stream decoder.
* See http://liba52.sourceforge.net/ for updates.
*
* a52dec is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* a52dec is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
static const int8_t exp_1[128] = {
-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
25,25,25
};
static const int8_t exp_2[128] = {
-2,-2,-2,-2,-2,-1,-1,-1,-1,-1, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2,
-2,-2,-2,-2,-2,-1,-1,-1,-1,-1, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2,
-2,-2,-2,-2,-2,-1,-1,-1,-1,-1, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2,
-2,-2,-2,-2,-2,-1,-1,-1,-1,-1, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2,
-2,-2,-2,-2,-2,-1,-1,-1,-1,-1, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2,
25,25,25
};
static const int8_t exp_3[128] = {
-2,-1, 0, 1, 2,-2,-1, 0, 1, 2,-2,-1, 0, 1, 2,-2,-1, 0, 1, 2,-2,-1, 0, 1, 2,
-2,-1, 0, 1, 2,-2,-1, 0, 1, 2,-2,-1, 0, 1, 2,-2,-1, 0, 1, 2,-2,-1, 0, 1, 2,
-2,-1, 0, 1, 2,-2,-1, 0, 1, 2,-2,-1, 0, 1, 2,-2,-1, 0, 1, 2,-2,-1, 0, 1, 2,
-2,-1, 0, 1, 2,-2,-1, 0, 1, 2,-2,-1, 0, 1, 2,-2,-1, 0, 1, 2,-2,-1, 0, 1, 2,
-2,-1, 0, 1, 2,-2,-1, 0, 1, 2,-2,-1, 0, 1, 2,-2,-1, 0, 1, 2,-2,-1, 0, 1, 2,
25,25,25
};
#define Q0 ((-2 << 15) / 3.0)
#define Q1 (0)
#define Q2 ((2 << 15) / 3.0)
static const sample_t q_1_0[32] = {
Q0,Q0,Q0,Q0,Q0,Q0,Q0,Q0,Q0,
Q1,Q1,Q1,Q1,Q1,Q1,Q1,Q1,Q1,
Q2,Q2,Q2,Q2,Q2,Q2,Q2,Q2,Q2,
0,0,0,0,0
};
static const sample_t q_1_1[32] = {
Q0,Q0,Q0,Q1,Q1,Q1,Q2,Q2,Q2,
Q0,Q0,Q0,Q1,Q1,Q1,Q2,Q2,Q2,
Q0,Q0,Q0,Q1,Q1,Q1,Q2,Q2,Q2,
0,0,0,0,0
};
static const sample_t q_1_2[32] = {
Q0,Q1,Q2,Q0,Q1,Q2,Q0,Q1,Q2,
Q0,Q1,Q2,Q0,Q1,Q2,Q0,Q1,Q2,
Q0,Q1,Q2,Q0,Q1,Q2,Q0,Q1,Q2,
0,0,0,0,0
};
#undef Q0
#undef Q1
#undef Q2
#define Q0 ((-4 << 15) / 5.0)
#define Q1 ((-2 << 15) / 5.0)
#define Q2 (0)
#define Q3 ((2 << 15) / 5.0)
#define Q4 ((4 << 15) / 5.0)
static const sample_t q_2_0[128] = {
Q0,Q0,Q0,Q0,Q0,Q0,Q0,Q0,Q0,Q0,Q0,Q0,Q0,Q0,Q0,Q0,Q0,Q0,Q0,Q0,Q0,Q0,Q0,Q0,Q0,
Q1,Q1,Q1,Q1,Q1,Q1,Q1,Q1,Q1,Q1,Q1,Q1,Q1,Q1,Q1,Q1,Q1,Q1,Q1,Q1,Q1,Q1,Q1,Q1,Q1,
Q2,Q2,Q2,Q2,Q2,Q2,Q2,Q2,Q2,Q2,Q2,Q2,Q2,Q2,Q2,Q2,Q2,Q2,Q2,Q2,Q2,Q2,Q2,Q2,Q2,
Q3,Q3,Q3,Q3,Q3,Q3,Q3,Q3,Q3,Q3,Q3,Q3,Q3,Q3,Q3,Q3,Q3,Q3,Q3,Q3,Q3,Q3,Q3,Q3,Q3,
Q4,Q4,Q4,Q4,Q4,Q4,Q4,Q4,Q4,Q4,Q4,Q4,Q4,Q4,Q4,Q4,Q4,Q4,Q4,Q4,Q4,Q4,Q4,Q4,Q4,
0,0,0
};
static const sample_t q_2_1[128] = {
Q0,Q0,Q0,Q0,Q0,Q1,Q1,Q1,Q1,Q1,Q2,Q2,Q2,Q2,Q2,Q3,Q3,Q3,Q3,Q3,Q4,Q4,Q4,Q4,Q4,
Q0,Q0,Q0,Q0,Q0,Q1,Q1,Q1,Q1,Q1,Q2,Q2,Q2,Q2,Q2,Q3,Q3,Q3,Q3,Q3,Q4,Q4,Q4,Q4,Q4,
Q0,Q0,Q0,Q0,Q0,Q1,Q1,Q1,Q1,Q1,Q2,Q2,Q2,Q2,Q2,Q3,Q3,Q3,Q3,Q3,Q4,Q4,Q4,Q4,Q4,
Q0,Q0,Q0,Q0,Q0,Q1,Q1,Q1,Q1,Q1,Q2,Q2,Q2,Q2,Q2,Q3,Q3,Q3,Q3,Q3,Q4,Q4,Q4,Q4,Q4,
Q0,Q0,Q0,Q0,Q0,Q1,Q1,Q1,Q1,Q1,Q2,Q2,Q2,Q2,Q2,Q3,Q3,Q3,Q3,Q3,Q4,Q4,Q4,Q4,Q4,
0,0,0
};
static const sample_t q_2_2[128] = {
Q0,Q1,Q2,Q3,Q4,Q0,Q1,Q2,Q3,Q4,Q0,Q1,Q2,Q3,Q4,Q0,Q1,Q2,Q3,Q4,Q0,Q1,Q2,Q3,Q4,
Q0,Q1,Q2,Q3,Q4,Q0,Q1,Q2,Q3,Q4,Q0,Q1,Q2,Q3,Q4,Q0,Q1,Q2,Q3,Q4,Q0,Q1,Q2,Q3,Q4,
Q0,Q1,Q2,Q3,Q4,Q0,Q1,Q2,Q3,Q4,Q0,Q1,Q2,Q3,Q4,Q0,Q1,Q2,Q3,Q4,Q0,Q1,Q2,Q3,Q4,
Q0,Q1,Q2,Q3,Q4,Q0,Q1,Q2,Q3,Q4,Q0,Q1,Q2,Q3,Q4,Q0,Q1,Q2,Q3,Q4,Q0,Q1,Q2,Q3,Q4,
Q0,Q1,Q2,Q3,Q4,Q0,Q1,Q2,Q3,Q4,Q0,Q1,Q2,Q3,Q4,Q0,Q1,Q2,Q3,Q4,Q0,Q1,Q2,Q3,Q4,
0,0,0
};
#undef Q0
#undef Q1
#undef Q2
#undef Q3
#undef Q4
static const sample_t q_3[8] = {
(-6 << 15)/7.0, (-4 << 15)/7.0, (-2 << 15)/7.0, 0,
( 2 << 15)/7.0, ( 4 << 15)/7.0, ( 6 << 15)/7.0, 0
};
#define Q0 ((-10 << 15) / 11.0)
#define Q1 ((-8 << 15) / 11.0)
#define Q2 ((-6 << 15) / 11.0)
#define Q3 ((-4 << 15) / 11.0)
#define Q4 ((-2 << 15) / 11.0)
#define Q5 (0)
#define Q6 ((2 << 15) / 11.0)
#define Q7 ((4 << 15) / 11.0)
#define Q8 ((6 << 15) / 11.0)
#define Q9 ((8 << 15) / 11.0)
#define QA ((10 << 15) / 11.0)
static const sample_t q_4_0[128] = {
Q0, Q0, Q0, Q0, Q0, Q0, Q0, Q0, Q0, Q0, Q0,
Q1, Q1, Q1, Q1, Q1, Q1, Q1, Q1, Q1, Q1, Q1,
Q2, Q2, Q2, Q2, Q2, Q2, Q2, Q2, Q2, Q2, Q2,
Q3, Q3, Q3, Q3, Q3, Q3, Q3, Q3, Q3, Q3, Q3,
Q4, Q4, Q4, Q4, Q4, Q4, Q4, Q4, Q4, Q4, Q4,
Q5, Q5, Q5, Q5, Q5, Q5, Q5, Q5, Q5, Q5, Q5,
Q6, Q6, Q6, Q6, Q6, Q6, Q6, Q6, Q6, Q6, Q6,
Q7, Q7, Q7, Q7, Q7, Q7, Q7, Q7, Q7, Q7, Q7,
Q8, Q8, Q8, Q8, Q8, Q8, Q8, Q8, Q8, Q8, Q8,
Q9, Q9, Q9, Q9, Q9, Q9, Q9, Q9, Q9, Q9, Q9,
QA, QA, QA, QA, QA, QA, QA, QA, QA, QA, QA,
0, 0, 0, 0, 0, 0, 0
};
static const sample_t q_4_1[128] = {
Q0, Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, Q9, QA,
Q0, Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, Q9, QA,
Q0, Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, Q9, QA,
Q0, Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, Q9, QA,
Q0, Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, Q9, QA,
Q0, Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, Q9, QA,
Q0, Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, Q9, QA,
Q0, Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, Q9, QA,
Q0, Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, Q9, QA,
Q0, Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, Q9, QA,
Q0, Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, Q9, QA,
0, 0, 0, 0, 0, 0, 0
};
#undef Q0
#undef Q1
#undef Q2
#undef Q3
#undef Q4
#undef Q5
#undef Q6
#undef Q7
#undef Q8
#undef Q9
#undef QA
static const sample_t q_5[16] = {
(-14 << 15)/15.0,(-12 << 15)/15.0,(-10 << 15)/15.0,
( -8 << 15)/15.0,( -6 << 15)/15.0,( -4 << 15)/15.0,
( -2 << 15)/15.0, 0 ,( 2 << 15)/15.0,
( 4 << 15)/15.0,( 6 << 15)/15.0,( 8 << 15)/15.0,
( 10 << 15)/15.0,( 12 << 15)/15.0,( 14 << 15)/15.0,
0
};
static const sample_t scale_factor[25] = {
0.000030517578125,
0.0000152587890625,
0.00000762939453125,
0.000003814697265625,
0.0000019073486328125,
0.00000095367431640625,
0.000000476837158203125,
0.0000002384185791015625,
0.00000011920928955078125,
0.000000059604644775390625,
0.0000000298023223876953125,
0.00000001490116119384765625,
0.000000007450580596923828125,
0.0000000037252902984619140625,
0.00000000186264514923095703125,
0.000000000931322574615478515625,
0.0000000004656612873077392578125,
0.00000000023283064365386962890625,
0.000000000116415321826934814453125,
0.0000000000582076609134674072265625,
0.00000000002910383045673370361328125,
0.000000000014551915228366851806640625,
0.0000000000072759576141834259033203125,
0.00000000000363797880709171295166015625,
0.000000000001818989403545856475830078125
};
static const uint16_t dither_lut[256] = {
0x0000, 0xa011, 0xe033, 0x4022, 0x6077, 0xc066, 0x8044, 0x2055,
0xc0ee, 0x60ff, 0x20dd, 0x80cc, 0xa099, 0x0088, 0x40aa, 0xe0bb,
0x21cd, 0x81dc, 0xc1fe, 0x61ef, 0x41ba, 0xe1ab, 0xa189, 0x0198,
0xe123, 0x4132, 0x0110, 0xa101, 0x8154, 0x2145, 0x6167, 0xc176,
0x439a, 0xe38b, 0xa3a9, 0x03b8, 0x23ed, 0x83fc, 0xc3de, 0x63cf,
0x8374, 0x2365, 0x6347, 0xc356, 0xe303, 0x4312, 0x0330, 0xa321,
0x6257, 0xc246, 0x8264, 0x2275, 0x0220, 0xa231, 0xe213, 0x4202,
0xa2b9, 0x02a8, 0x428a, 0xe29b, 0xc2ce, 0x62df, 0x22fd, 0x82ec,
0x8734, 0x2725, 0x6707, 0xc716, 0xe743, 0x4752, 0x0770, 0xa761,
0x47da, 0xe7cb, 0xa7e9, 0x07f8, 0x27ad, 0x87bc, 0xc79e, 0x678f,
0xa6f9, 0x06e8, 0x46ca, 0xe6db, 0xc68e, 0x669f, 0x26bd, 0x86ac,
0x6617, 0xc606, 0x8624, 0x2635, 0x0660, 0xa671, 0xe653, 0x4642,
0xc4ae, 0x64bf, 0x249d, 0x848c, 0xa4d9, 0x04c8, 0x44ea, 0xe4fb,
0x0440, 0xa451, 0xe473, 0x4462, 0x6437, 0xc426, 0x8404, 0x2415,
0xe563, 0x4572, 0x0550, 0xa541, 0x8514, 0x2505, 0x6527, 0xc536,
0x258d, 0x859c, 0xc5be, 0x65af, 0x45fa, 0xe5eb, 0xa5c9, 0x05d8,
0xae79, 0x0e68, 0x4e4a, 0xee5b, 0xce0e, 0x6e1f, 0x2e3d, 0x8e2c,
0x6e97, 0xce86, 0x8ea4, 0x2eb5, 0x0ee0, 0xaef1, 0xeed3, 0x4ec2,
0x8fb4, 0x2fa5, 0x6f87, 0xcf96, 0xefc3, 0x4fd2, 0x0ff0, 0xafe1,
0x4f5a, 0xef4b, 0xaf69, 0x0f78, 0x2f2d, 0x8f3c, 0xcf1e, 0x6f0f,
0xede3, 0x4df2, 0x0dd0, 0xadc1, 0x8d94, 0x2d85, 0x6da7, 0xcdb6,
0x2d0d, 0x8d1c, 0xcd3e, 0x6d2f, 0x4d7a, 0xed6b, 0xad49, 0x0d58,
0xcc2e, 0x6c3f, 0x2c1d, 0x8c0c, 0xac59, 0x0c48, 0x4c6a, 0xec7b,
0x0cc0, 0xacd1, 0xecf3, 0x4ce2, 0x6cb7, 0xcca6, 0x8c84, 0x2c95,
0x294d, 0x895c, 0xc97e, 0x696f, 0x493a, 0xe92b, 0xa909, 0x0918,
0xe9a3, 0x49b2, 0x0990, 0xa981, 0x89d4, 0x29c5, 0x69e7, 0xc9f6,
0x0880, 0xa891, 0xe8b3, 0x48a2, 0x68f7, 0xc8e6, 0x88c4, 0x28d5,
0xc86e, 0x687f, 0x285d, 0x884c, 0xa819, 0x0808, 0x482a, 0xe83b,
0x6ad7, 0xcac6, 0x8ae4, 0x2af5, 0x0aa0, 0xaab1, 0xea93, 0x4a82,
0xaa39, 0x0a28, 0x4a0a, 0xea1b, 0xca4e, 0x6a5f, 0x2a7d, 0x8a6c,
0x4b1a, 0xeb0b, 0xab29, 0x0b38, 0x2b6d, 0x8b7c, 0xcb5e, 0x6b4f,
0x8bf4, 0x2be5, 0x6bc7, 0xcbd6, 0xeb83, 0x4b92, 0x0bb0, 0xaba1
};
--- NEW FILE: downmix.c ---
/*
* downmix.c
* Copyright (C) 2000-2002 Michel Lespinasse <walken@zoy.org>
* Copyright (C) 1999-2000 Aaron Holtzman <aholtzma@ess.engr.uvic.ca>
*
* This file is part of a52dec, a free ATSC A-52 stream decoder.
* See http://liba52.sourceforge.net/ for updates.
*
* a52dec is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* a52dec is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "config.h"
#include <string.h>
#include <inttypes.h>
#include "a52.h"
#include "a52_internal.h"
#define CONVERT(acmod,output) (((output) << 3) + (acmod))
int a52_downmix_init (int input, int flags, sample_t * level,
sample_t clev, sample_t slev)
{
static uint8_t table[11][8] = {
{A52_CHANNEL, A52_DOLBY, A52_STEREO, A52_STEREO,
A52_STEREO, A52_STEREO, A52_STEREO, A52_STEREO},
{A52_MONO, A52_MONO, A52_MONO, A52_MONO,
A52_MONO, A52_MONO, A52_MONO, A52_MONO},
{A52_CHANNEL, A52_DOLBY, A52_STEREO, A52_STEREO,
A52_STEREO, A52_STEREO, A52_STEREO, A52_STEREO},
{A52_CHANNEL, A52_DOLBY, A52_STEREO, A52_3F,
A52_STEREO, A52_3F, A52_STEREO, A52_3F},
{A52_CHANNEL, A52_DOLBY, A52_STEREO, A52_STEREO,
A52_2F1R, A52_2F1R, A52_2F1R, A52_2F1R},
{A52_CHANNEL, A52_DOLBY, A52_STEREO, A52_STEREO,
A52_2F1R, A52_3F1R, A52_2F1R, A52_3F1R},
{A52_CHANNEL, A52_DOLBY, A52_STEREO, A52_3F,
A52_2F2R, A52_2F2R, A52_2F2R, A52_2F2R},
{A52_CHANNEL, A52_DOLBY, A52_STEREO, A52_3F,
A52_2F2R, A52_3F2R, A52_2F2R, A52_3F2R},
{A52_CHANNEL1, A52_MONO, A52_MONO, A52_MONO,
A52_MONO, A52_MONO, A52_MONO, A52_MONO},
{A52_CHANNEL2, A52_MONO, A52_MONO, A52_MONO,
A52_MONO, A52_MONO, A52_MONO, A52_MONO},
{A52_CHANNEL, A52_DOLBY, A52_STEREO, A52_DOLBY,
A52_DOLBY, A52_DOLBY, A52_DOLBY, A52_DOLBY}
};
int output;
output = flags & A52_CHANNEL_MASK;
if (output > A52_DOLBY)
return -1;
output = table[output][input & 7];
if ((output == A52_STEREO) &&
((input == A52_DOLBY) || ((input == A52_3F) && (clev == LEVEL_3DB))))
output = A52_DOLBY;
if (flags & A52_ADJUST_LEVEL)
switch (CONVERT (input & 7, output)) {
case CONVERT (A52_3F, A52_MONO):
*level *= LEVEL_3DB / (1 + clev);
break;
case CONVERT (A52_STEREO, A52_MONO):
case CONVERT (A52_2F2R, A52_2F1R):
case CONVERT (A52_3F2R, A52_3F1R):
level_3db:
*level *= LEVEL_3DB;
break;
case CONVERT (A52_3F2R, A52_2F1R):
if (clev < LEVEL_PLUS3DB - 1)
goto level_3db;
/* break thru */
case CONVERT (A52_3F, A52_STEREO):
case CONVERT (A52_3F1R, A52_2F1R):
case CONVERT (A52_3F1R, A52_2F2R):
case CONVERT (A52_3F2R, A52_2F2R):
*level /= 1 + clev;
break;
case CONVERT (A52_2F1R, A52_MONO):
*level *= LEVEL_PLUS3DB / (2 + slev);
break;
case CONVERT (A52_2F1R, A52_STEREO):
case CONVERT (A52_3F1R, A52_3F):
*level /= 1 + slev * LEVEL_3DB;
break;
case CONVERT (A52_3F1R, A52_MONO):
*level *= LEVEL_3DB / (1 + clev + 0.5 * slev);
break;
case CONVERT (A52_3F1R, A52_STEREO):
*level /= 1 + clev + slev * LEVEL_3DB;
break;
case CONVERT (A52_2F2R, A52_MONO):
*level *= LEVEL_3DB / (1 + slev);
break;
case CONVERT (A52_2F2R, A52_STEREO):
case CONVERT (A52_3F2R, A52_3F):
*level /= 1 + slev;
break;
case CONVERT (A52_3F2R, A52_MONO):
*level *= LEVEL_3DB / (1 + clev + slev);
break;
case CONVERT (A52_3F2R, A52_STEREO):
*level /= 1 + clev + slev;
break;
case CONVERT (A52_MONO, A52_DOLBY):
*level *= LEVEL_PLUS3DB;
break;
case CONVERT (A52_3F, A52_DOLBY):
case CONVERT (A52_2F1R, A52_DOLBY):
*level *= 1 / (1 + LEVEL_3DB);
break;
case CONVERT (A52_3F1R, A52_DOLBY):
case CONVERT (A52_2F2R, A52_DOLBY):
*level *= 1 / (1 + 2 * LEVEL_3DB);
break;
case CONVERT (A52_3F2R, A52_DOLBY):
*level *= 1 / (1 + 3 * LEVEL_3DB);
break;
}
return output;
}
int a52_downmix_coeff (sample_t * coeff, int acmod, int output, sample_t level,
sample_t clev, sample_t slev)
{
switch (CONVERT (acmod, output & A52_CHANNEL_MASK)) {
case CONVERT (A52_CHANNEL, A52_CHANNEL):
case CONVERT (A52_MONO, A52_MONO):
case CONVERT (A52_STEREO, A52_STEREO):
case CONVERT (A52_3F, A52_3F):
case CONVERT (A52_2F1R, A52_2F1R):
case CONVERT (A52_3F1R, A52_3F1R):
case CONVERT (A52_2F2R, A52_2F2R):
case CONVERT (A52_3F2R, A52_3F2R):
case CONVERT (A52_STEREO, A52_DOLBY):
coeff[0] = coeff[1] = coeff[2] = coeff[3] = coeff[4] = level;
return 0;
case CONVERT (A52_CHANNEL, A52_MONO):
coeff[0] = coeff[1] = level * LEVEL_6DB;
return 3;
case CONVERT (A52_STEREO, A52_MONO):
coeff[0] = coeff[1] = level * LEVEL_3DB;
return 3;
case CONVERT (A52_3F, A52_MONO):
coeff[0] = coeff[2] = level * LEVEL_3DB;
coeff[1] = level * clev * LEVEL_PLUS3DB;
return 7;
case CONVERT (A52_2F1R, A52_MONO):
coeff[0] = coeff[1] = level * LEVEL_3DB;
coeff[2] = level * slev * LEVEL_3DB;
return 7;
case CONVERT (A52_2F2R, A52_MONO):
coeff[0] = coeff[1] = level * LEVEL_3DB;
coeff[2] = coeff[3] = level * slev * LEVEL_3DB;
return 15;
case CONVERT (A52_3F1R, A52_MONO):
coeff[0] = coeff[2] = level * LEVEL_3DB;
coeff[1] = level * clev * LEVEL_PLUS3DB;
coeff[3] = level * slev * LEVEL_3DB;
return 15;
case CONVERT (A52_3F2R, A52_MONO):
coeff[0] = coeff[2] = level * LEVEL_3DB;
coeff[1] = level * clev * LEVEL_PLUS3DB;
coeff[3] = coeff[4] = level * slev * LEVEL_3DB;
return 31;
case CONVERT (A52_MONO, A52_DOLBY):
coeff[0] = level * LEVEL_3DB;
return 0;
case CONVERT (A52_3F, A52_DOLBY):
clev = LEVEL_3DB;
case CONVERT (A52_3F, A52_STEREO):
case CONVERT (A52_3F1R, A52_2F1R):
case CONVERT (A52_3F2R, A52_2F2R):
coeff[0] = coeff[2] = coeff[3] = coeff[4] = level;
coeff[1] = level * clev;
return 7;
case CONVERT (A52_2F1R, A52_DOLBY):
slev = 1;
case CONVERT (A52_2F1R, A52_STEREO):
coeff[0] = coeff[1] = level;
coeff[2] = level * slev * LEVEL_3DB;
return 7;
case CONVERT (A52_3F1R, A52_DOLBY):
clev = LEVEL_3DB;
slev = 1;
case CONVERT (A52_3F1R, A52_STEREO):
coeff[0] = coeff[2] = level;
coeff[1] = level * clev;
coeff[3] = level * slev * LEVEL_3DB;
return 15;
case CONVERT (A52_2F2R, A52_DOLBY):
slev = LEVEL_3DB;
case CONVERT (A52_2F2R, A52_STEREO):
coeff[0] = coeff[1] = level;
coeff[2] = coeff[3] = level * slev;
return 15;
case CONVERT (A52_3F2R, A52_DOLBY):
clev = LEVEL_3DB;
case CONVERT (A52_3F2R, A52_2F1R):
slev = LEVEL_3DB;
case CONVERT (A52_3F2R, A52_STEREO):
coeff[0] = coeff[2] = level;
coeff[1] = level * clev;
coeff[3] = coeff[4] = level * slev;
return 31;
case CONVERT (A52_3F1R, A52_3F):
coeff[0] = coeff[1] = coeff[2] = level;
coeff[3] = level * slev * LEVEL_3DB;
return 13;
case CONVERT (A52_3F2R, A52_3F):
coeff[0] = coeff[1] = coeff[2] = level;
coeff[3] = coeff[4] = level * slev;
return 29;
case CONVERT (A52_2F2R, A52_2F1R):
coeff[0] = coeff[1] = level;
coeff[2] = coeff[3] = level * LEVEL_3DB;
return 12;
case CONVERT (A52_3F2R, A52_3F1R):
coeff[0] = coeff[1] = coeff[2] = level;
coeff[3] = coeff[4] = level * LEVEL_3DB;
return 24;
case CONVERT (A52_2F1R, A52_2F2R):
coeff[0] = coeff[1] = level;
coeff[2] = level * LEVEL_3DB;
return 0;
case CONVERT (A52_3F1R, A52_2F2R):
coeff[0] = coeff[2] = level;
coeff[1] = level * clev;
coeff[3] = level * LEVEL_3DB;
return 7;
case CONVERT (A52_3F1R, A52_3F2R):
coeff[0] = coeff[1] = coeff[2] = level;
coeff[3] = level * LEVEL_3DB;
return 0;
case CONVERT (A52_CHANNEL, A52_CHANNEL1):
coeff[0] = level;
coeff[1] = 0;
return 0;
case CONVERT (A52_CHANNEL, A52_CHANNEL2):
coeff[0] = 0;
coeff[1] = level;
return 0;
}
return -1; /* NOTREACHED */
}
static void mix2to1 (sample_t * dest, sample_t * src, sample_t bias)
{
int i;
for (i = 0; i < 256; i++)
dest[i] += src[i] + bias;
}
static void mix3to1 (sample_t * samples, sample_t bias)
{
int i;
for (i = 0; i < 256; i++)
samples[i] += samples[i + 256] + samples[i + 512] + bias;
}
static void mix4to1 (sample_t * samples, sample_t bias)
{
int i;
for (i = 0; i < 256; i++)
samples[i] += (samples[i + 256] + samples[i + 512] +
samples[i + 768] + bias);
}
static void mix5to1 (sample_t * samples, sample_t bias)
{
int i;
for (i = 0; i < 256; i++)
samples[i] += (samples[i + 256] + samples[i + 512] +
samples[i + 768] + samples[i + 1024] + bias);
}
static void mix3to2 (sample_t * samples, sample_t bias)
{
int i;
sample_t common;
for (i = 0; i < 256; i++) {
common = samples[i + 256] + bias;
samples[i] += common;
samples[i + 256] = samples[i + 512] + common;
}
}
static void mix21to2 (sample_t * left, sample_t * right, sample_t bias)
{
int i;
sample_t common;
for (i = 0; i < 256; i++) {
common = right[i + 256] + bias;
left[i] += common;
right[i] += common;
}
}
static void mix21toS (sample_t * samples, sample_t bias)
{
int i;
sample_t surround;
for (i = 0; i < 256; i++) {
surround = samples[i + 512];
samples[i] += bias - surround;
samples[i + 256] += bias + surround;
}
}
static void mix31to2 (sample_t * samples, sample_t bias)
{
int i;
sample_t common;
for (i = 0; i < 256; i++) {
common = samples[i + 256] + samples[i + 768] + bias;
samples[i] += common;
samples[i + 256] = samples[i + 512] + common;
}
}
static void mix31toS (sample_t * samples, sample_t bias)
{
int i;
sample_t common, surround;
for (i = 0; i < 256; i++) {
common = samples[i + 256] + bias;
surround = samples[i + 768];
samples[i] += common - surround;
samples[i + 256] = samples[i + 512] + common + surround;
}
}
static void mix22toS (sample_t * samples, sample_t bias)
{
int i;
sample_t surround;
for (i = 0; i < 256; i++) {
surround = samples[i + 512] + samples[i + 768];
samples[i] += bias - surround;
samples[i + 256] += bias + surround;
}
}
static void mix32to2 (sample_t * samples, sample_t bias)
{
int i;
sample_t common;
for (i = 0; i < 256; i++) {
common = samples[i + 256] + bias;
samples[i] += common + samples[i + 768];
samples[i + 256] = common + samples[i + 512] + samples[i + 1024];
}
}
static void mix32toS (sample_t * samples, sample_t bias)
{
int i;
sample_t common, surround;
for (i = 0; i < 256; i++) {
common = samples[i + 256] + bias;
surround = samples[i + 768] + samples[i + 1024];
samples[i] += common - surround;
samples[i + 256] = samples[i + 512] + common + surround;
}
}
static void move2to1 (sample_t * src, sample_t * dest, sample_t bias)
{
int i;
for (i = 0; i < 256; i++)
dest[i] = src[i] + src[i + 256] + bias;
}
static void zero (sample_t * samples)
{
int i;
for (i = 0; i < 256; i++)
samples[i] = 0;
}
void a52_downmix (sample_t * samples, int acmod, int output, sample_t bias,
sample_t clev, sample_t slev)
{
switch (CONVERT (acmod, output & A52_CHANNEL_MASK)) {
case CONVERT (A52_CHANNEL, A52_CHANNEL2):
memcpy (samples, samples + 256, 256 * sizeof (sample_t));
break;
case CONVERT (A52_CHANNEL, A52_MONO):
case CONVERT (A52_STEREO, A52_MONO):
mix_2to1:
mix2to1 (samples, samples + 256, bias);
break;
case CONVERT (A52_2F1R, A52_MONO):
if (slev == 0)
goto mix_2to1;
case CONVERT (A52_3F, A52_MONO):
mix_3to1:
mix3to1 (samples, bias);
break;
case CONVERT (A52_3F1R, A52_MONO):
if (slev == 0)
goto mix_3to1;
case CONVERT (A52_2F2R, A52_MONO):
if (slev == 0)
goto mix_2to1;
mix4to1 (samples, bias);
break;
case CONVERT (A52_3F2R, A52_MONO):
if (slev == 0)
goto mix_3to1;
mix5to1 (samples, bias);
break;
case CONVERT (A52_MONO, A52_DOLBY):
memcpy (samples + 256, samples, 256 * sizeof (sample_t));
break;
case CONVERT (A52_3F, A52_STEREO):
case CONVERT (A52_3F, A52_DOLBY):
mix_3to2:
mix3to2 (samples, bias);
break;
case CONVERT (A52_2F1R, A52_STEREO):
if (slev == 0)
break;
mix21to2 (samples, samples + 256, bias);
break;
case CONVERT (A52_2F1R, A52_DOLBY):
mix21toS (samples, bias);
break;
case CONVERT (A52_3F1R, A52_STEREO):
if (slev == 0)
goto mix_3to2;
mix31to2 (samples, bias);
break;
case CONVERT (A52_3F1R, A52_DOLBY):
mix31toS (samples, bias);
break;
case CONVERT (A52_2F2R, A52_STEREO):
if (slev == 0)
break;
mix2to1 (samples, samples + 512, bias);
mix2to1 (samples + 256, samples + 768, bias);
break;
case CONVERT (A52_2F2R, A52_DOLBY):
mix22toS (samples, bias);
break;
case CONVERT (A52_3F2R, A52_STEREO):
if (slev == 0)
goto mix_3to2;
mix32to2 (samples, bias);
break;
case CONVERT (A52_3F2R, A52_DOLBY):
mix32toS (samples, bias);
break;
case CONVERT (A52_3F1R, A52_3F):
if (slev == 0)
break;
mix21to2 (samples, samples + 512, bias);
break;
case CONVERT (A52_3F2R, A52_3F):
if (slev == 0)
break;
mix2to1 (samples, samples + 768, bias);
mix2to1 (samples + 512, samples + 1024, bias);
break;
case CONVERT (A52_3F1R, A52_2F1R):
mix3to2 (samples, bias);
memcpy (samples + 512, samples + 768, 256 * sizeof (sample_t));
break;
case CONVERT (A52_2F2R, A52_2F1R):
mix2to1 (samples + 512, samples + 768, bias);
break;
case CONVERT (A52_3F2R, A52_2F1R):
mix3to2 (samples, bias);
move2to1 (samples + 768, samples + 512, bias);
break;
case CONVERT (A52_3F2R, A52_3F1R):
mix2to1 (samples + 768, samples + 1024, bias);
break;
case CONVERT (A52_2F1R, A52_2F2R):
memcpy (samples + 768, samples + 512, 256 * sizeof (sample_t));
break;
case CONVERT (A52_3F1R, A52_2F2R):
mix3to2 (samples, bias);
memcpy (samples + 512, samples + 768, 256 * sizeof (sample_t));
break;
case CONVERT (A52_3F2R, A52_2F2R):
mix3to2 (samples, bias);
memcpy (samples + 512, samples + 768, 256 * sizeof (sample_t));
memcpy (samples + 768, samples + 1024, 256 * sizeof (sample_t));
break;
case CONVERT (A52_3F1R, A52_3F2R):
memcpy (samples + 1027, samples + 768, 256 * sizeof (sample_t));
break;
}
}
void a52_upmix (sample_t * samples, int acmod, int output)
{
switch (CONVERT (acmod, output & A52_CHANNEL_MASK)) {
case CONVERT (A52_CHANNEL, A52_CHANNEL2):
memcpy (samples + 256, samples, 256 * sizeof (sample_t));
break;
case CONVERT (A52_3F2R, A52_MONO):
zero (samples + 1024);
case CONVERT (A52_3F1R, A52_MONO):
case CONVERT (A52_2F2R, A52_MONO):
zero (samples + 768);
case CONVERT (A52_3F, A52_MONO):
case CONVERT (A52_2F1R, A52_MONO):
zero (samples + 512);
case CONVERT (A52_CHANNEL, A52_MONO):
case CONVERT (A52_STEREO, A52_MONO):
zero (samples + 256);
break;
case CONVERT (A52_3F2R, A52_STEREO):
case CONVERT (A52_3F2R, A52_DOLBY):
zero (samples + 1024);
case CONVERT (A52_3F1R, A52_STEREO):
case CONVERT (A52_3F1R, A52_DOLBY):
zero (samples + 768);
case CONVERT (A52_3F, A52_STEREO):
case CONVERT (A52_3F, A52_DOLBY):
mix_3to2:
memcpy (samples + 512, samples + 256, 256 * sizeof (sample_t));
zero (samples + 256);
break;
case CONVERT (A52_2F2R, A52_STEREO):
case CONVERT (A52_2F2R, A52_DOLBY):
zero (samples + 768);
case CONVERT (A52_2F1R, A52_STEREO):
case CONVERT (A52_2F1R, A52_DOLBY):
zero (samples + 512);
break;
case CONVERT (A52_3F2R, A52_3F):
zero (samples + 1024);
case CONVERT (A52_3F1R, A52_3F):
case CONVERT (A52_2F2R, A52_2F1R):
zero (samples + 768);
break;
case CONVERT (A52_3F2R, A52_3F1R):
zero (samples + 1024);
break;
case CONVERT (A52_3F2R, A52_2F1R):
zero (samples + 1024);
case CONVERT (A52_3F1R, A52_2F1R):
mix_31to21:
memcpy (samples + 768, samples + 512, 256 * sizeof (sample_t));
goto mix_3to2;
case CONVERT (A52_3F2R, A52_2F2R):
memcpy (samples + 1024, samples + 768, 256 * sizeof (sample_t));
goto mix_31to21;
}
}
--- NEW FILE: crc.c ---
/*
* crc.c
*
* Copyright (C) Aaron Holtzman - May 1999
*
* This file is part of ac3dec, a free Dolby AC-3 stream decoder.
*
* ac3dec is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* ac3dec is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNU Make; see the file COPYING. If not, write to
* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
#include <stdlib.h>
#include <stdio.h>
#include <inttypes.h>
uint16_t crc16_block(uint8_t *,uint32_t);
static const uint16_t crc_lut[256] =
{
0x0000,0x8005,0x800f,0x000a,0x801b,0x001e,0x0014,0x8011,
0x8033,0x0036,0x003c,0x8039,0x0028,0x802d,0x8027,0x0022,
0x8063,0x0066,0x006c,0x8069,0x0078,0x807d,0x8077,0x0072,
0x0050,0x8055,0x805f,0x005a,0x804b,0x004e,0x0044,0x8041,
0x80c3,0x00c6,0x00cc,0x80c9,0x00d8,0x80dd,0x80d7,0x00d2,
0x00f0,0x80f5,0x80ff,0x00fa,0x80eb,0x00ee,0x00e4,0x80e1,
0x00a0,0x80a5,0x80af,0x00aa,0x80bb,0x00be,0x00b4,0x80b1,
0x8093,0x0096,0x009c,0x8099,0x0088,0x808d,0x8087,0x0082,
0x8183,0x0186,0x018c,0x8189,0x0198,0x819d,0x8197,0x0192,
0x01b0,0x81b5,0x81bf,0x01ba,0x81ab,0x01ae,0x01a4,0x81a1,
0x01e0,0x81e5,0x81ef,0x01ea,0x81fb,0x01fe,0x01f4,0x81f1,
0x81d3,0x01d6,0x01dc,0x81d9,0x01c8,0x81cd,0x81c7,0x01c2,
0x0140,0x8145,0x814f,0x014a,0x815b,0x015e,0x0154,0x8151,
0x8173,0x0176,0x017c,0x8179,0x0168,0x816d,0x8167,0x0162,
0x8123,0x0126,0x012c,0x8129,0x0138,0x813d,0x8137,0x0132,
0x0110,0x8115,0x811f,0x011a,0x810b,0x010e,0x0104,0x8101,
0x8303,0x0306,0x030c,0x8309,0x0318,0x831d,0x8317,0x0312,
0x0330,0x8335,0x833f,0x033a,0x832b,0x032e,0x0324,0x8321,
0x0360,0x8365,0x836f,0x036a,0x837b,0x037e,0x0374,0x8371,
0x8353,0x0356,0x035c,0x8359,0x0348,0x834d,0x8347,0x0342,
0x03c0,0x83c5,0x83cf,0x03ca,0x83db,0x03de,0x03d4,0x83d1,
0x83f3,0x03f6,0x03fc,0x83f9,0x03e8,0x83ed,0x83e7,0x03e2,
0x83a3,0x03a6,0x03ac,0x83a9,0x03b8,0x83bd,0x83b7,0x03b2,
0x0390,0x8395,0x839f,0x039a,0x838b,0x038e,0x0384,0x8381,
0x0280,0x8285,0x828f,0x028a,0x829b,0x029e,0x0294,0x8291,
0x82b3,0x02b6,0x02bc,0x82b9,0x02a8,0x82ad,0x82a7,0x02a2,
0x82e3,0x02e6,0x02ec,0x82e9,0x02f8,0x82fd,0x82f7,0x02f2,
0x02d0,0x82d5,0x82df,0x02da,0x82cb,0x02ce,0x02c4,0x82c1,
0x8243,0x0246,0x024c,0x8249,0x0258,0x825d,0x8257,0x0252,
0x0270,0x8275,0x827f,0x027a,0x826b,0x026e,0x0264,0x8261,
0x0220,0x8225,0x822f,0x022a,0x823b,0x023e,0x0234,0x8231,
0x8213,0x0216,0x021c,0x8219,0x0208,0x820d,0x8207,0x0202
};
uint16_t crc16_block(uint8_t *data,uint32_t num_bytes)
{
uint32_t i;
uint16_t state=0;
for(i=0;i<num_bytes;i++)
state = crc_lut[data[i] ^ (state>>8)] ^ (state<<8);
return state;
}
--- NEW FILE: bitstream.c ---
/*
* bitstream.c
* Copyright (C) 2000-2002 Michel Lespinasse <walken@zoy.org>
* Copyright (C) 1999-2000 Aaron Holtzman <aholtzma@ess.engr.uvic.ca>
*
* This file is part of a52dec, a free ATSC A-52 stream decoder.
* See http://liba52.sourceforge.net/ for updates.
*
* a52dec is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* a52dec is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "config.h"
#include <inttypes.h>
#include "a52.h"
#include "a52_internal.h"
#include "bitstream.h"
#define BUFFER_SIZE 4096
void a52_bitstream_set_ptr (a52_state_t * state, uint8_t * buf)
{
int align;
align = (long)buf & 3;
state->buffer_start = (uint32_t *) (buf - align);
state->bits_left = 0;
bitstream_get (state, align * 8);
}
static inline void bitstream_fill_current (a52_state_t * state)
{
uint32_t tmp;
tmp = *(state->buffer_start++);
state->current_word = swab32 (tmp);
}
/*
* The fast paths for _get is in the
* bitstream.h header file so it can be inlined.
*
* The "bottom half" of this routine is suffixed _bh
*
* -ah
*/
uint32_t a52_bitstream_get_bh (a52_state_t * state, uint32_t num_bits)
{
uint32_t result;
num_bits -= state->bits_left;
result = ((state->current_word << (32 - state->bits_left)) >>
(32 - state->bits_left));
bitstream_fill_current (state);
if (num_bits != 0)
result = (result << num_bits) | (state->current_word >> (32 - num_bits));
state->bits_left = 32 - num_bits;
return result;
}
int32_t a52_bitstream_get_bh_2 (a52_state_t * state, uint32_t num_bits)
{
int32_t result;
num_bits -= state->bits_left;
result = ((((int32_t)state->current_word) << (32 - state->bits_left)) >>
(32 - state->bits_left));
bitstream_fill_current(state);
if (num_bits != 0)
result = (result << num_bits) | (state->current_word >> (32 - num_bits));
state->bits_left = 32 - num_bits;
return result;
}
--- NEW FILE: parse.c ---
/*
* parse.c
* Copyright (C) 2000-2002 Michel Lespinasse <walken@zoy.org>
* Copyright (C) 1999-2000 Aaron Holtzman <aholtzma@ess.engr.uvic.ca>
*
* This file is part of a52dec, a free ATSC A-52 stream decoder.
* See http://liba52.sourceforge.net/ for updates.
*
* a52dec is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* a52dec is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "config.h"
#include <stdlib.h>
#include <string.h>
#include <inttypes.h>
#include "a52.h"
#include "a52_internal.h"
#include "bitstream.h"
#include "tables.h"
#include "xineutils.h"
typedef struct {
sample_t q1[2];
sample_t q2[2];
sample_t q4;
int q1_ptr;
int q2_ptr;
int q4_ptr;
} quantizer_t;
static uint8_t halfrate[12] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 3};
a52_state_t * a52_init (uint32_t mm_accel)
{
a52_state_t * state;
int i;
state = malloc (sizeof (a52_state_t));
if (state == NULL)
return NULL;
state->samples = xine_xmalloc_aligned (16, 256 * 12 * sizeof (sample_t), &state->samples_base);
if (state->samples == NULL) {
free (state);
return NULL;
}
for (i = 0; i < 256 * 12; i++)
state->samples[i] = 0;
state->downmixed = 1;
state->lfsr_state = 1;
a52_imdct_init (mm_accel);
return state;
}
sample_t * a52_samples (a52_state_t * state)
{
return state->samples;
}
int a52_syncinfo (uint8_t * buf, int * flags,
int * sample_rate, int * bit_rate)
{
static int rate[] = { 32, 40, 48, 56, 64, 80, 96, 112,
128, 160, 192, 224, 256, 320, 384, 448,
512, 576, 640};
static uint8_t lfeon[8] = {0x10, 0x10, 0x04, 0x04, 0x04, 0x01, 0x04, 0x01};
int frmsizecod;
int bitrate;
int half;
int acmod;
if ((buf[0] != 0x0b) || (buf[1] != 0x77)) /* syncword */
return 0;
if (buf[5] >= 0x60) /* bsid >= 12 */
return 0;
half = halfrate[buf[5] >> 3];
/* acmod, dsurmod and lfeon */
acmod = buf[6] >> 5;
*flags = ((((buf[6] & 0xf8) == 0x50) ? A52_DOLBY : acmod) |
((buf[6] & lfeon[acmod]) ? A52_LFE : 0));
frmsizecod = buf[4] & 63;
if (frmsizecod >= 38)
return 0;
bitrate = rate [frmsizecod >> 1];
*bit_rate = (bitrate * 1000) >> half;
switch (buf[4] & 0xc0) {
case 0:
*sample_rate = 48000 >> half;
return 4 * bitrate;
case 0x40:
*sample_rate = 44100 >> half;
return 2 * (320 * bitrate / 147 + (frmsizecod & 1));
case 0x80:
*sample_rate = 32000 >> half;
return 6 * bitrate;
default:
return 0;
}
}
int a52_frame (a52_state_t * state, uint8_t * buf, int * flags,
sample_t * level, sample_t bias)
{
static sample_t clev[4] = {LEVEL_3DB, LEVEL_45DB, LEVEL_6DB, LEVEL_45DB};
static sample_t slev[4] = {LEVEL_3DB, LEVEL_6DB, 0, LEVEL_6DB};
int chaninfo;
int acmod;
state->fscod = buf[4] >> 6;
state->halfrate = halfrate[buf[5] >> 3];
state->acmod = acmod = buf[6] >> 5;
a52_bitstream_set_ptr (state, buf + 6);
bitstream_get (state, 3); /* skip acmod we already parsed */
if ((acmod == 2) && (bitstream_get (state, 2) == 2)) /* dsurmod */
acmod = A52_DOLBY;
if ((acmod & 1) && (acmod != 1))
state->clev = clev[bitstream_get (state, 2)]; /* cmixlev */
if (acmod & 4)
state->slev = slev[bitstream_get (state, 2)]; /* surmixlev */
state->lfeon = bitstream_get (state, 1);
state->output = a52_downmix_init (acmod, *flags, level,
state->clev, state->slev);
if (state->output < 0)
return 1;
if (state->lfeon && (*flags & A52_LFE))
state->output |= A52_LFE;
*flags = state->output;
/* the 2* compensates for differences in imdct */
state->dynrng = state->level = 2 * *level;
state->bias = bias;
state->dynrnge = 1;
state->dynrngcall = NULL;
state->cplba.deltbae = DELTA_BIT_NONE;
state->ba[0].deltbae = state->ba[1].deltbae = state->ba[2].deltbae =
state->ba[3].deltbae = state->ba[4].deltbae = DELTA_BIT_NONE;
chaninfo = !acmod;
do {
bitstream_get (state, 5); /* dialnorm */
if (bitstream_get (state, 1)) /* compre */
bitstream_get (state, 8); /* compr */
if (bitstream_get (state, 1)) /* langcode */
bitstream_get (state, 8); /* langcod */
if (bitstream_get (state, 1)) /* audprodie */
bitstream_get (state, 7); /* mixlevel + roomtyp */
} while (chaninfo--);
bitstream_get (state, 2); /* copyrightb + origbs */
if (bitstream_get (state, 1)) /* timecod1e */
bitstream_get (state, 14); /* timecod1 */
if (bitstream_get (state, 1)) /* timecod2e */
bitstream_get (state, 14); /* timecod2 */
if (bitstream_get (state, 1)) { /* addbsie */
int addbsil;
addbsil = bitstream_get (state, 6);
do {
bitstream_get (state, 8); /* addbsi */
} while (addbsil--);
}
return 0;
}
void a52_dynrng (a52_state_t * state,
sample_t (* call) (sample_t, void *), void * data)
{
state->dynrnge = 0;
if (call) {
state->dynrnge = 1;
state->dynrngcall = call;
state->dynrngdata = data;
}
}
static int parse_exponents (a52_state_t * state, int expstr, int ngrps,
uint8_t exponent, uint8_t * dest)
{
int exps;
while (ngrps--) {
exps = bitstream_get (state, 7);
exponent += exp_1[exps];
if (exponent > 24)
return 1;
switch (expstr) {
case EXP_D45:
*(dest++) = exponent;
*(dest++) = exponent;
case EXP_D25:
*(dest++) = exponent;
case EXP_D15:
*(dest++) = exponent;
}
exponent += exp_2[exps];
if (exponent > 24)
return 1;
switch (expstr) {
case EXP_D45:
*(dest++) = exponent;
*(dest++) = exponent;
case EXP_D25:
*(dest++) = exponent;
case EXP_D15:
*(dest++) = exponent;
}
exponent += exp_3[exps];
if (exponent > 24)
return 1;
switch (expstr) {
case EXP_D45:
*(dest++) = exponent;
*(dest++) = exponent;
case EXP_D25:
*(dest++) = exponent;
case EXP_D15:
*(dest++) = exponent;
}
}
return 0;
}
static int parse_deltba (a52_state_t * state, int8_t * deltba)
{
int deltnseg, deltlen, delta, j;
memset (deltba, 0, 50);
deltnseg = bitstream_get (state, 3);
j = 0;
do {
j += bitstream_get (state, 5);
deltlen = bitstream_get (state, 4);
delta = bitstream_get (state, 3);
delta -= (delta >= 4) ? 3 : 4;
if (!deltlen)
continue;
if (j + deltlen >= 50)
return 1;
while (deltlen--)
deltba[j++] = delta;
} while (deltnseg--);
return 0;
}
static inline int zero_snr_offsets (int nfchans, a52_state_t * state)
{
int i;
if ((state->csnroffst) ||
(state->chincpl && state->cplba.bai >> 3) || /* cplinu, fsnroffst */
(state->lfeon && state->lfeba.bai >> 3)) /* fsnroffst */
return 0;
for (i = 0; i < nfchans; i++)
if (state->ba[i].bai >> 3) /* fsnroffst */
return 0;
return 1;
}
static inline int16_t dither_gen (a52_state_t * state)
{
int16_t nstate;
nstate = dither_lut[state->lfsr_state >> 8] ^ (state->lfsr_state << 8);
state->lfsr_state = (uint16_t) nstate;
return nstate;
}
static void coeff_get (a52_state_t * state, sample_t * coeff,
expbap_t * expbap, quantizer_t * quantizer,
sample_t level, int dither, int end)
{
int i;
uint8_t * exp;
int8_t * bap;
sample_t factor[25];
for (i = 0; i <= 24; i++)
factor[i] = scale_factor[i] * level;
exp = expbap->exp;
bap = expbap->bap;
for (i = 0; i < end; i++) {
int bapi;
bapi = bap[i];
switch (bapi) {
case 0:
if (dither) {
coeff[i] = dither_gen (state) * LEVEL_3DB * factor[exp[i]];
continue;
} else {
coeff[i] = 0;
continue;
}
case -1:
if (quantizer->q1_ptr >= 0) {
coeff[i] = quantizer->q1[quantizer->q1_ptr--] * factor[exp[i]];
continue;
} else {
int code;
code = bitstream_get (state, 5);
quantizer->q1_ptr = 1;
quantizer->q1[0] = q_1_2[code];
quantizer->q1[1] = q_1_1[code];
coeff[i] = q_1_0[code] * factor[exp[i]];
continue;
}
case -2:
if (quantizer->q2_ptr >= 0) {
coeff[i] = quantizer->q2[quantizer->q2_ptr--] * factor[exp[i]];
continue;
} else {
int code;
code = bitstream_get (state, 7);
quantizer->q2_ptr = 1;
quantizer->q2[0] = q_2_2[code];
quantizer->q2[1] = q_2_1[code];
coeff[i] = q_2_0[code] * factor[exp[i]];
continue;
}
case 3:
coeff[i] = q_3[bitstream_get (state, 3)] * factor[exp[i]];
continue;
case -3:
if (quantizer->q4_ptr == 0) {
quantizer->q4_ptr = -1;
coeff[i] = quantizer->q4 * factor[exp[i]];
continue;
} else {
int code;
code = bitstream_get (state, 7);
quantizer->q4_ptr = 0;
quantizer->q4 = q_4_1[code];
coeff[i] = q_4_0[code] * factor[exp[i]];
continue;
}
case 4:
coeff[i] = q_5[bitstream_get (state, 4)] * factor[exp[i]];
continue;
default:
coeff[i] = ((bitstream_get_2 (state, bapi) << (16 - bapi)) *
factor[exp[i]]);
}
}
}
static void coeff_get_coupling (a52_state_t * state, int nfchans,
sample_t * coeff, sample_t (* samples)[256],
quantizer_t * quantizer, uint8_t dithflag[5])
{
int cplbndstrc, bnd, i, i_end, ch;
uint8_t * exp;
int8_t * bap;
sample_t cplco[5];
exp = state->cpl_expbap.exp;
bap = state->cpl_expbap.bap;
bnd = 0;
cplbndstrc = state->cplbndstrc;
i = state->cplstrtmant;
while (i < state->cplendmant) {
i_end = i + 12;
while (cplbndstrc & 1) {
cplbndstrc >>= 1;
i_end += 12;
}
cplbndstrc >>= 1;
for (ch = 0; ch < nfchans; ch++)
cplco[ch] = state->cplco[ch][bnd] * coeff[ch];
bnd++;
while (i < i_end) {
sample_t cplcoeff;
int bapi;
bapi = bap[i];
switch (bapi) {
case 0:
cplcoeff = LEVEL_3DB * scale_factor[exp[i]];
for (ch = 0; ch < nfchans; ch++)
if ((state->chincpl >> ch) & 1) {
if (dithflag[ch])
samples[ch][i] = (cplcoeff * cplco[ch] *
dither_gen (state));
else
samples[ch][i] = 0;
}
i++;
continue;
case -1:
if (quantizer->q1_ptr >= 0) {
cplcoeff = quantizer->q1[quantizer->q1_ptr--];
break;
} else {
int code;
code = bitstream_get (state, 5);
quantizer->q1_ptr = 1;
quantizer->q1[0] = q_1_2[code];
quantizer->q1[1] = q_1_1[code];
cplcoeff = q_1_0[code];
break;
}
case -2:
if (quantizer->q2_ptr >= 0) {
cplcoeff = quantizer->q2[quantizer->q2_ptr--];
break;
} else {
int code;
code = bitstream_get (state, 7);
quantizer->q2_ptr = 1;
quantizer->q2[0] = q_2_2[code];
quantizer->q2[1] = q_2_1[code];
cplcoeff = q_2_0[code];
break;
}
case 3:
cplcoeff = q_3[bitstream_get (state, 3)];
break;
case -3:
if (quantizer->q4_ptr == 0) {
quantizer->q4_ptr = -1;
cplcoeff = quantizer->q4;
break;
} else {
int code;
code = bitstream_get (state, 7);
quantizer->q4_ptr = 0;
quantizer->q4 = q_4_1[code];
cplcoeff = q_4_0[code];
break;
}
case 4:
cplcoeff = q_5[bitstream_get (state, 4)];
break;
default:
cplcoeff = bitstream_get_2 (state, bapi) << (16 - bapi);
}
cplcoeff *= scale_factor[exp[i]];
for (ch = 0; ch < nfchans; ch++)
if ((state->chincpl >> ch) & 1)
samples[ch][i] = cplcoeff * cplco[ch];
i++;
}
}
}
int a52_block (a52_state_t * state)
{
static const uint8_t nfchans_tbl[] = {2, 1, 2, 3, 3, 4, 4, 5, 1, 1, 2};
static int rematrix_band[4] = {25, 37, 61, 253};
int i, nfchans, chaninfo;
uint8_t cplexpstr, chexpstr[5], lfeexpstr, do_bit_alloc, done_cpl;
uint8_t blksw[5], dithflag[5];
sample_t coeff[5];
int chanbias;
quantizer_t quantizer;
sample_t * samples;
nfchans = nfchans_tbl[state->acmod];
for (i = 0; i < nfchans; i++)
blksw[i] = bitstream_get (state, 1);
for (i = 0; i < nfchans; i++)
dithflag[i] = bitstream_get (state, 1);
chaninfo = !state->acmod;
do {
if (bitstream_get (state, 1)) { /* dynrnge */
int dynrng;
dynrng = bitstream_get_2 (state, 8);
if (state->dynrnge) {
sample_t range;
range = ((((dynrng & 0x1f) | 0x20) << 13) *
scale_factor[3 - (dynrng >> 5)]);
if (state->dynrngcall)
range = state->dynrngcall (range, state->dynrngdata);
state->dynrng = state->level * range;
}
}
} while (chaninfo--);
if (bitstream_get (state, 1)) { /* cplstre */
state->chincpl = 0;
if (bitstream_get (state, 1)) { /* cplinu */
static uint8_t bndtab[16] = {31, 35, 37, 39, 41, 42, 43, 44,
45, 45, 46, 46, 47, 47, 48, 48};
int cplbegf;
int cplendf;
int ncplsubnd;
for (i = 0; i < nfchans; i++)
state->chincpl |= bitstream_get (state, 1) << i;
switch (state->acmod) {
case 0: case 1:
return 1;
case 2:
state->phsflginu = bitstream_get (state, 1);
}
cplbegf = bitstream_get (state, 4);
cplendf = bitstream_get (state, 4);
if (cplendf + 3 - cplbegf < 0)
return 1;
state->ncplbnd = ncplsubnd = cplendf + 3 - cplbegf;
state->cplstrtbnd = bndtab[cplbegf];
state->cplstrtmant = cplbegf * 12 + 37;
state->cplendmant = cplendf * 12 + 73;
state->cplbndstrc = 0;
for (i = 0; i < ncplsubnd - 1; i++)
if (bitstream_get (state, 1)) {
state->cplbndstrc |= 1 << i;
state->ncplbnd--;
}
}
}
if (state->chincpl) { /* cplinu */
int j, cplcoe;
cplcoe = 0;
for (i = 0; i < nfchans; i++)
if ((state->chincpl) >> i & 1)
if (bitstream_get (state, 1)) { /* cplcoe */
int mstrcplco, cplcoexp, cplcomant;
cplcoe = 1;
mstrcplco = 3 * bitstream_get (state, 2);
for (j = 0; j < state->ncplbnd; j++) {
cplcoexp = bitstream_get (state, 4);
cplcomant = bitstream_get (state, 4);
if (cplcoexp == 15)
cplcomant <<= 14;
else
cplcomant = (cplcomant | 0x10) << 13;
state->cplco[i][j] =
cplcomant * scale_factor[cplcoexp + mstrcplco];
}
}
if ((state->acmod == 2) && state->phsflginu && cplcoe)
for (j = 0; j < state->ncplbnd; j++)
if (bitstream_get (state, 1)) /* phsflg */
state->cplco[1][j] = -state->cplco[1][j];
}
if ((state->acmod == 2) && (bitstream_get (state, 1))) { /* rematstr */
int end;
state->rematflg = 0;
end = (state->chincpl) ? state->cplstrtmant : 253; /* cplinu */
i = 0;
do
state->rematflg |= bitstream_get (state, 1) << i;
while (rematrix_band[i++] < end);
}
cplexpstr = EXP_REUSE;
lfeexpstr = EXP_REUSE;
if (state->chincpl) /* cplinu */
cplexpstr = bitstream_get (state, 2);
for (i = 0; i < nfchans; i++)
chexpstr[i] = bitstream_get (state, 2);
if (state->lfeon)
lfeexpstr = bitstream_get (state, 1);
for (i = 0; i < nfchans; i++)
if (chexpstr[i] != EXP_REUSE) {
if ((state->chincpl >> i) & 1)
state->endmant[i] = state->cplstrtmant;
else {
int chbwcod;
chbwcod = bitstream_get (state, 6);
if (chbwcod > 60)
return 1;
state->endmant[i] = chbwcod * 3 + 73;
}
}
do_bit_alloc = 0;
if (cplexpstr != EXP_REUSE) {
int cplabsexp, ncplgrps;
do_bit_alloc = 64;
ncplgrps = ((state->cplendmant - state->cplstrtmant) /
(3 << (cplexpstr - 1)));
cplabsexp = bitstream_get (state, 4) << 1;
if (parse_exponents (state, cplexpstr, ncplgrps, cplabsexp,
state->cpl_expbap.exp + state->cplstrtmant))
return 1;
}
for (i = 0; i < nfchans; i++)
if (chexpstr[i] != EXP_REUSE) {
int grp_size, nchgrps;
do_bit_alloc |= 1 << i;
grp_size = 3 << (chexpstr[i] - 1);
nchgrps = (state->endmant[i] + grp_size - 4) / grp_size;
state->fbw_expbap[i].exp[0] = bitstream_get (state, 4);
if (parse_exponents (state, chexpstr[i], nchgrps,
state->fbw_expbap[i].exp[0],
state->fbw_expbap[i].exp + 1))
return 1;
bitstream_get (state, 2); /* gainrng */
}
if (lfeexpstr != EXP_REUSE) {
do_bit_alloc |= 32;
state->lfe_expbap.exp[0] = bitstream_get (state, 4);
if (parse_exponents (state, lfeexpstr, 2, state->lfe_expbap.exp[0],
state->lfe_expbap.exp + 1))
return 1;
}
if (bitstream_get (state, 1)) { /* baie */
do_bit_alloc = -1;
state->bai = bitstream_get (state, 11);
}
if (bitstream_get (state, 1)) { /* snroffste */
do_bit_alloc = -1;
state->csnroffst = bitstream_get (state, 6);
if (state->chincpl) /* cplinu */
state->cplba.bai = bitstream_get (state, 7);
for (i = 0; i < nfchans; i++)
state->ba[i].bai = bitstream_get (state, 7);
if (state->lfeon)
state->lfeba.bai = bitstream_get (state, 7);
}
if ((state->chincpl) && (bitstream_get (state, 1))) { /* cplleake */
do_bit_alloc |= 64;
state->cplfleak = 9 - bitstream_get (state, 3);
state->cplsleak = 9 - bitstream_get (state, 3);
}
if (bitstream_get (state, 1)) { /* deltbaie */
do_bit_alloc = -1;
if (state->chincpl) /* cplinu */
state->cplba.deltbae = bitstream_get (state, 2);
for (i = 0; i < nfchans; i++)
state->ba[i].deltbae = bitstream_get (state, 2);
if (state->chincpl && /* cplinu */
(state->cplba.deltbae == DELTA_BIT_NEW) &&
parse_deltba (state, state->cplba.deltba))
return 1;
for (i = 0; i < nfchans; i++)
if ((state->ba[i].deltbae == DELTA_BIT_NEW) &&
parse_deltba (state, state->ba[i].deltba))
return 1;
}
if (do_bit_alloc) {
if (zero_snr_offsets (nfchans, state)) {
memset (state->cpl_expbap.bap, 0, sizeof (state->cpl_expbap.bap));
for (i = 0; i < nfchans; i++)
memset (state->fbw_expbap[i].bap, 0,
sizeof (state->fbw_expbap[i].bap));
memset (state->lfe_expbap.bap, 0, sizeof (state->lfe_expbap.bap));
} else {
if (state->chincpl && (do_bit_alloc & 64)) /* cplinu */
a52_bit_allocate (state, &state->cplba, state->cplstrtbnd,
state->cplstrtmant, state->cplendmant,
state->cplfleak << 8, state->cplsleak << 8,
&state->cpl_expbap);
for (i = 0; i < nfchans; i++)
if (do_bit_alloc & (1 << i))
a52_bit_allocate (state, state->ba + i, 0, 0,
state->endmant[i], 0, 0,
state->fbw_expbap +i);
if (state->lfeon && (do_bit_alloc & 32)) {
state->lfeba.deltbae = DELTA_BIT_NONE;
a52_bit_allocate (state, &state->lfeba, 0, 0, 7, 0, 0,
&state->lfe_expbap);
}
}
}
if (bitstream_get (state, 1)) { /* skiple */
i = bitstream_get (state, 9); /* skipl */
while (i--)
bitstream_get (state, 8);
}
samples = state->samples;
if (state->output & A52_LFE)
samples += 256; /* shift for LFE channel */
chanbias = a52_downmix_coeff (coeff, state->acmod, state->output,
state->dynrng, state->clev, state->slev);
quantizer.q1_ptr = quantizer.q2_ptr = quantizer.q4_ptr = -1;
done_cpl = 0;
for (i = 0; i < nfchans; i++) {
int j;
coeff_get (state, samples + 256 * i, state->fbw_expbap +i, &quantizer,
coeff[i], dithflag[i], state->endmant[i]);
if ((state->chincpl >> i) & 1) {
if (!done_cpl) {
done_cpl = 1;
coeff_get_coupling (state, nfchans, coeff,
(sample_t (*)[256])samples, &quantizer,
dithflag);
}
j = state->cplendmant;
} else
j = state->endmant[i];
do
(samples + 256 * i)[j] = 0;
while (++j < 256);
}
if (state->acmod == 2) {
int j, end, band, rematflg;
end = ((state->endmant[0] < state->endmant[1]) ?
state->endmant[0] : state->endmant[1]);
i = 0;
j = 13;
rematflg = state->rematflg;
do {
if (! (rematflg & 1)) {
rematflg >>= 1;
j = rematrix_band[i++];
continue;
}
rematflg >>= 1;
band = rematrix_band[i++];
if (band > end)
band = end;
do {
sample_t tmp0, tmp1;
tmp0 = samples[j];
tmp1 = (samples+256)[j];
samples[j] = tmp0 + tmp1;
(samples+256)[j] = tmp0 - tmp1;
} while (++j < band);
} while (j < end);
}
if (state->lfeon) {
if (state->output & A52_LFE) {
coeff_get (state, samples - 256, &state->lfe_expbap, &quantizer,
state->dynrng, 0, 7);
for (i = 7; i < 256; i++)
(samples-256)[i] = 0;
a52_imdct_512 (samples - 256, samples + 1536 - 256, state->bias);
} else {
/* just skip the LFE coefficients */
coeff_get (state, samples + 1280, &state->lfe_expbap, &quantizer,
0, 0, 7);
}
}
i = 0;
if (nfchans_tbl[state->output & A52_CHANNEL_MASK] < nfchans)
for (i = 1; i < nfchans; i++)
if (blksw[i] != blksw[0])
break;
if (i < nfchans) {
if (state->downmixed) {
state->downmixed = 0;
a52_upmix (samples + 1536, state->acmod, state->output);
}
for (i = 0; i < nfchans; i++) {
sample_t bias;
bias = 0;
if (!(chanbias & (1 << i)))
bias = state->bias;
if (coeff[i]) {
if (blksw[i])
a52_imdct_256 (samples + 256 * i, samples + 1536 + 256 * i,
bias);
else
a52_imdct_512 (samples + 256 * i, samples + 1536 + 256 * i,
bias);
} else {
int j;
for (j = 0; j < 256; j++)
(samples + 256 * i)[j] = bias;
}
}
a52_downmix (samples, state->acmod, state->output, state->bias,
state->clev, state->slev);
} else {
nfchans = nfchans_tbl[state->output & A52_CHANNEL_MASK];
a52_downmix (samples, state->acmod, state->output, 0,
state->clev, state->slev);
if (!state->downmixed) {
state->downmixed = 1;
a52_downmix (samples + 1536, state->acmod, state->output, 0,
state->clev, state->slev);
}
if (blksw[0])
for (i = 0; i < nfchans; i++)
a52_imdct_256 (samples + 256 * i, samples + 1536 + 256 * i,
state->bias);
else
for (i = 0; i < nfchans; i++)
a52_imdct_512 (samples + 256 * i, samples + 1536 + 256 * i,
state->bias);
}
return 0;
}
void a52_free (a52_state_t * state)
{
free (state->samples_base);
free (state);
}
--- NEW FILE: a52_internal.h ---
/*
* a52_internal.h
* Copyright (C) 2000-2002 Michel Lespinasse <walken@zoy.org>
* Copyright (C) 1999-2000 Aaron Holtzman <aholtzma@ess.engr.uvic.ca>
*
* This file is part of a52dec, a free ATSC A-52 stream decoder.
* See http://liba52.sourceforge.net/ for updates.
*
* a52dec is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* a52dec is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
typedef struct {
uint8_t bai; /* fine SNR offset, fast gain */
uint8_t deltbae; /* delta bit allocation exists */
int8_t deltba[50]; /* per-band delta bit allocation */
} ba_t;
typedef struct {
uint8_t exp[256]; /* decoded channel exponents */
int8_t bap[256]; /* derived channel bit allocation */
} expbap_t;
struct a52_state_s {
uint8_t fscod; /* sample rate */
uint8_t halfrate; /* halfrate factor */
uint8_t acmod; /* coded channels */
uint8_t lfeon; /* coded lfe channel */
sample_t clev; /* centre channel mix level */
sample_t slev; /* surround channels mix level */
int output; /* type of output */
sample_t level; /* output level */
sample_t bias; /* output bias */
int dynrnge; /* apply dynamic range */
sample_t dynrng; /* dynamic range */
void * dynrngdata; /* dynamic range callback funtion and data */
sample_t (* dynrngcall) (sample_t range, void * dynrngdata);
uint8_t chincpl; /* channel coupled */
uint8_t phsflginu; /* phase flags in use (stereo only) */
uint8_t cplstrtmant; /* coupling channel start mantissa */
uint8_t cplendmant; /* coupling channel end mantissa */
uint32_t cplbndstrc; /* coupling band structure */
sample_t cplco[5][18]; /* coupling coordinates */
/* derived information */
uint8_t cplstrtbnd; /* coupling start band (for bit allocation) */
uint8_t ncplbnd; /* number of coupling bands */
uint8_t rematflg; /* stereo rematrixing */
uint8_t endmant[5]; /* channel end mantissa */
uint16_t bai; /* bit allocation information */
uint32_t * buffer_start;
uint16_t lfsr_state; /* dither state */
uint32_t bits_left;
uint32_t current_word;
uint8_t csnroffst; /* coarse SNR offset */
ba_t cplba; /* coupling bit allocation parameters */
ba_t ba[5]; /* channel bit allocation parameters */
ba_t lfeba; /* lfe bit allocation parameters */
uint8_t cplfleak; /* coupling fast leak init */
uint8_t cplsleak; /* coupling slow leak init */
expbap_t cpl_expbap;
expbap_t fbw_expbap[5];
expbap_t lfe_expbap;
sample_t * samples;
void * samples_base;
int downmixed;
};
#define LEVEL_PLUS6DB 2.0
#define LEVEL_PLUS3DB 1.4142135623730951
#define LEVEL_3DB 0.7071067811865476
#define LEVEL_45DB 0.5946035575013605
#define LEVEL_6DB 0.5
#define EXP_REUSE (0)
#define EXP_D15 (1)
#define EXP_D25 (2)
#define EXP_D45 (3)
#define DELTA_BIT_REUSE (0)
#define DELTA_BIT_NEW (1)
#define DELTA_BIT_NONE (2)
#define DELTA_BIT_RESERVED (3)
void a52_bit_allocate (a52_state_t * state, ba_t * ba, int bndstart,
int start, int end, int fastleak, int slowleak,
expbap_t * expbap);
int a52_downmix_init (int input, int flags, sample_t * level,
sample_t clev, sample_t slev);
int a52_downmix_coeff (sample_t * coeff, int acmod, int output, sample_t level,
sample_t clev, sample_t slev);
void a52_downmix (sample_t * samples, int acmod, int output, sample_t bias,
sample_t clev, sample_t slev);
void a52_upmix (sample_t * samples, int acmod, int output);
void a52_imdct_init (uint32_t mm_accel);
void a52_imdct_256 (sample_t * data, sample_t * delay, sample_t bias);
void a52_imdct_512 (sample_t * data, sample_t * delay, sample_t bias);
--- NEW FILE: bitstream.h ---
/*
* bitstream.h
* Copyright (C) 2000-2002 Michel Lespinasse <walken@zoy.org>
* Copyright (C) 1999-2000 Aaron Holtzman <aholtzma@ess.engr.uvic.ca>
*
* This file is part of a52dec, a free ATSC A-52 stream decoder.
* See http://liba52.sourceforge.net/ for updates.
*
* a52dec is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* a52dec is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifdef WIN32
#include <unistd.h>
#endif
/* (stolen from the kernel) */
#ifdef WORDS_BIGENDIAN
# define swab32(x) (x)
#else
# if 0 && defined (__i386__)
# define swab32(x) __i386_swab32(x)
static inline const uint32_t __i386_swab32(uint32_t x)
{
__asm__("bswap %0" : "=r" (x) : "0" (x));
return x;
}
# else
# define swab32(x)\
((((uint8_t*)&x)[0] << 24) | (((uint8_t*)&x)[1] << 16) | \
(((uint8_t*)&x)[2] << 8) | (((uint8_t*)&x)[3]))
# endif
#endif
void a52_bitstream_set_ptr (a52_state_t * state, uint8_t * buf);
uint32_t a52_bitstream_get_bh (a52_state_t * state, uint32_t num_bits);
int32_t a52_bitstream_get_bh_2 (a52_state_t * state, uint32_t num_bits);
static inline uint32_t bitstream_get (a52_state_t * state, uint32_t num_bits)
{
uint32_t result;
if (num_bits < state->bits_left) {
result = (state->current_word << (32 - state->bits_left)) >> (32 - num_bits);
state->bits_left -= num_bits;
return result;
}
return a52_bitstream_get_bh (state, num_bits);
}
static inline int32_t bitstream_get_2 (a52_state_t * state, uint32_t num_bits)
{
int32_t result;
if (num_bits < state->bits_left) {
result = (((int32_t)state->current_word) << (32 - state->bits_left)) >> (32 - num_bits);
state->bits_left -= num_bits;
return result;
}
return a52_bitstream_get_bh_2 (state, num_bits);
}
--- NEW FILE: bit_allocate.c ---
/*
* bit_allocate.c
* Copyright (C) 2000-2002 Michel Lespinasse <walken@zoy.org>
* Copyright (C) 1999-2000 Aaron Holtzman <aholtzma@ess.engr.uvic.ca>
*
* This file is part of a52dec, a free ATSC A-52 stream decoder.
* See http://liba52.sourceforge.net/ for updates.
*
* a52dec is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* a52dec is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "config.h"
#include <inttypes.h>
#include "a52.h"
#include "a52_internal.h"
static int hthtab[3][50] = {
{0x730, 0x730, 0x7c0, 0x800, 0x820, 0x840, 0x850, 0x850, 0x860, 0x860,
0x860, 0x860, 0x860, 0x870, 0x870, 0x870, 0x880, 0x880, 0x890, 0x890,
0x8a0, 0x8a0, 0x8b0, 0x8b0, 0x8c0, 0x8c0, 0x8d0, 0x8e0, 0x8f0, 0x900,
0x910, 0x910, 0x910, 0x910, 0x900, 0x8f0, 0x8c0, 0x870, 0x820, 0x7e0,
0x7a0, 0x770, 0x760, 0x7a0, 0x7c0, 0x7c0, 0x6e0, 0x400, 0x3c0, 0x3c0},
{0x710, 0x710, 0x7a0, 0x7f0, 0x820, 0x830, 0x840, 0x850, 0x850, 0x860,
0x860, 0x860, 0x860, 0x860, 0x870, 0x870, 0x870, 0x880, 0x880, 0x880,
0x890, 0x890, 0x8a0, 0x8a0, 0x8b0, 0x8b0, 0x8c0, 0x8c0, 0x8e0, 0x8f0,
0x900, 0x910, 0x910, 0x910, 0x910, 0x900, 0x8e0, 0x8b0, 0x870, 0x820,
0x7e0, 0x7b0, 0x760, 0x770, 0x7a0, 0x7c0, 0x780, 0x5d0, 0x3c0, 0x3c0},
{0x680, 0x680, 0x750, 0x7b0, 0x7e0, 0x810, 0x820, 0x830, 0x840, 0x850,
0x850, 0x850, 0x860, 0x860, 0x860, 0x860, 0x860, 0x860, 0x860, 0x860,
0x870, 0x870, 0x870, 0x870, 0x880, 0x880, 0x880, 0x890, 0x8a0, 0x8b0,
0x8c0, 0x8d0, 0x8e0, 0x8f0, 0x900, 0x910, 0x910, 0x910, 0x900, 0x8f0,
0x8d0, 0x8b0, 0x840, 0x7f0, 0x790, 0x760, 0x7a0, 0x7c0, 0x7b0, 0x720}
};
static int8_t baptab[305] = {
16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16,
16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16,
16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16,
16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16,
16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16,
16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, /* 93 padding elems */
16, 16, 16, 16, 16, 16, 16, 16, 16, 14, 14, 14, 14, 14, 14, 14,
14, 12, 12, 12, 12, 11, 11, 11, 11, 10, 10, 10, 10, 9, 9, 9,
9, 8, 8, 8, 8, 7, 7, 7, 7, 6, 6, 6, 6, 5, 5, 5,
5, 4, 4, -3, -3, 3, 3, 3, -2, -2, -1, -1, -1, -1, -1, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0 /* 148 padding elems */
};
static int bndtab[30] = {21, 22, 23, 24, 25, 26, 27, 28, 31, 34,
37, 40, 43, 46, 49, 55, 61, 67, 73, 79,
85, 97, 109, 121, 133, 157, 181, 205, 229, 253};
static int8_t latab[256] = {
-64, -63, -62, -61, -60, -59, -58, -57, -56, -55, -54, -53,
-52, -52, -51, -50, -49, -48, -47, -47, -46, -45, -44, -44,
-43, -42, -41, -41, -40, -39, -38, -38, -37, -36, -36, -35,
-35, -34, -33, -33, -32, -32, -31, -30, -30, -29, -29, -28,
-28, -27, -27, -26, -26, -25, -25, -24, -24, -23, -23, -22,
-22, -21, -21, -21, -20, -20, -19, -19, -19, -18, -18, -18,
-17, -17, -17, -16, -16, -16, -15, -15, -15, -14, -14, -14,
-13, -13, -13, -13, -12, -12, -12, -12, -11, -11, -11, -11,
-10, -10, -10, -10, -10, -9, -9, -9, -9, -9, -8, -8,
-8, -8, -8, -8, -7, -7, -7, -7, -7, -7, -6, -6,
-6, -6, -6, -6, -6, -6, -5, -5, -5, -5, -5, -5,
-5, -5, -4, -4, -4, -4, -4, -4, -4, -4, -4, -4,
-4, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3,
-3, -3, -3, -2, -2, -2, -2, -2, -2, -2, -2, -2,
-2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0
};
#define UPDATE_LEAK() \
do { \
fastleak += fdecay; \
if (fastleak > psd + fgain) \
fastleak = psd + fgain; \
slowleak += sdecay; \
if (slowleak > psd + sgain) \
slowleak = psd + sgain; \
} while (0)
#define COMPUTE_MASK() \
do { \
if (psd > dbknee) \
mask -= (psd - dbknee) >> 2; \
if (mask > hth [i >> halfrate]) \
mask = hth [i >> halfrate]; \
mask -= snroffset + 128 * deltba[i]; \
mask = (mask > 0) ? 0 : ((-mask) >> 5); \
mask -= floor; \
} while (0)
void a52_bit_allocate (a52_state_t * state, ba_t * ba, int bndstart,
int start, int end, int fastleak, int slowleak,
expbap_t * expbap)
{
static int slowgain[4] = {0x540, 0x4d8, 0x478, 0x410};
static int dbpbtab[4] = {0xc00, 0x500, 0x300, 0x100};
static int floortab[8] = {0x910, 0x950, 0x990, 0x9d0,
0xa10, 0xa90, 0xb10, 0x1400};
int i, j;
uint8_t * exp;
int8_t * bap;
int fdecay, fgain, sdecay, sgain, dbknee, floor, snroffset;
int psd, mask;
int8_t * deltba;
int * hth;
int halfrate;
halfrate = state->halfrate;
fdecay = (63 + 20 * ((state->bai >> 7) & 3)) >> halfrate; /* fdcycod */
fgain = 128 + 128 * (ba->bai & 7); /* fgaincod */
sdecay = (15 + 2 * (state->bai >> 9)) >> halfrate; /* sdcycod */
sgain = slowgain[(state->bai >> 5) & 3]; /* sgaincod */
dbknee = dbpbtab[(state->bai >> 3) & 3]; /* dbpbcod */
hth = hthtab[state->fscod];
/*
* if there is no delta bit allocation, make deltba point to an area
* known to contain zeroes. baptab+156 here.
*/
deltba = (ba->deltbae == DELTA_BIT_NONE) ? baptab + 156 : ba->deltba;
floor = floortab[state->bai & 7]; /* floorcod */
snroffset = 960 - 64 * state->csnroffst - 4 * (ba->bai >> 3) + floor;
floor >>= 5;
exp = expbap->exp;
bap = expbap->bap;
i = bndstart;
j = start;
if (start == 0) { /* not the coupling channel */
int lowcomp;
lowcomp = 0;
j = end - 1;
do {
if (i < j) {
if (exp[i+1] == exp[i] - 2)
lowcomp = 384;
else if (lowcomp && (exp[i+1] > exp[i]))
lowcomp -= 64;
}
psd = 128 * exp[i];
mask = psd + fgain + lowcomp;
COMPUTE_MASK ();
bap[i] = (baptab+156)[mask + 4 * exp[i]];
i++;
} while ((i < 3) || ((i < 7) && (exp[i] > exp[i-1])));
fastleak = psd + fgain;
slowleak = psd + sgain;
while (i < 7) {
if (i < j) {
if (exp[i+1] == exp[i] - 2)
lowcomp = 384;
else if (lowcomp && (exp[i+1] > exp[i]))
lowcomp -= 64;
}
psd = 128 * exp[i];
UPDATE_LEAK ();
mask = ((fastleak + lowcomp < slowleak) ?
fastleak + lowcomp : slowleak);
COMPUTE_MASK ();
bap[i] = (baptab+156)[mask + 4 * exp[i]];
i++;
}
if (end == 7) /* lfe channel */
return;
do {
if (exp[i+1] == exp[i] - 2)
lowcomp = 320;
else if (lowcomp && (exp[i+1] > exp[i]))
lowcomp -= 64;
psd = 128 * exp[i];
UPDATE_LEAK ();
mask = ((fastleak + lowcomp < slowleak) ?
fastleak + lowcomp : slowleak);
COMPUTE_MASK ();
bap[i] = (baptab+156)[mask + 4 * exp[i]];
i++;
} while (i < 20);
while (lowcomp > 128) { /* two iterations maximum */
lowcomp -= 128;
psd = 128 * exp[i];
UPDATE_LEAK ();
mask = ((fastleak + lowcomp < slowleak) ?
fastleak + lowcomp : slowleak);
COMPUTE_MASK ();
bap[i] = (baptab+156)[mask + 4 * exp[i]];
i++;
}
j = i;
}
do {
int startband, endband;
startband = j;
endband = ((bndtab-20)[i] < end) ? (bndtab-20)[i] : end;
psd = 128 * exp[j++];
while (j < endband) {
int next, delta;
next = 128 * exp[j++];
delta = next - psd;
switch (delta >> 9) {
case -6: case -5: case -4: case -3: case -2:
psd = next;
break;
case -1:
psd = next + latab[(-delta) >> 1];
break;
case 0:
psd += latab[delta >> 1];
break;
}
}
/* minpsd = -289 */
UPDATE_LEAK ();
mask = (fastleak < slowleak) ? fastleak : slowleak;
COMPUTE_MASK ();
i++;
j = startband;
do {
/* max(mask+4*exp)=147=-(minpsd+fgain-deltba-snroffset)>>5+4*exp */
/* min(mask+4*exp)=-156=-(sgain-deltba-snroffset)>>5 */
bap[j] = (baptab+156)[mask + 4 * exp[j]];
} while (++j < endband);
} while (j < end);
}