#include <vlc_codec.h>
#include <vlc_aout.h>
#include <vlc_block_helper.h>
-#include <vlc_bits.h>
+
+#include "a52.h"
/*****************************************************************************
* Module descriptor
* decoder_sys_t : decoder descriptor
*****************************************************************************/
-#define A52_HEADER_SIZE 7
-
struct decoder_sys_t
{
/* Module mode */
audio_date_t end_date;
mtime_t i_pts;
- int i_frame_size, i_bit_rate;
- unsigned int i_rate, i_channels, i_channels_conf;
+
+ vlc_a52_header_t frame;
};
enum {
****************************************************************************/
static void *DecodeBlock ( decoder_t *, block_t ** );
-static int SyncInfo ( const uint8_t *, unsigned int *, unsigned int *,
- unsigned int *, int * );
-
static uint8_t *GetOutBuffer ( decoder_t *, void ** );
static aout_buffer_t *GetAoutBuffer( decoder_t * );
static block_t *GetSoutBuffer( decoder_t * );
static void *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
{
decoder_sys_t *p_sys = p_dec->p_sys;
- uint8_t p_header[A52_HEADER_SIZE];
+ uint8_t p_header[VLC_A52_HEADER_SIZE];
uint8_t *p_buf;
void *p_out_buffer;
p_sys->i_state = STATE_HEADER;
case STATE_HEADER:
- /* Get A/52 frame header (A52_HEADER_SIZE bytes) */
+ /* Get A/52 frame header (VLC_A52_HEADER_SIZE bytes) */
if( block_PeekBytes( &p_sys->bytestream, p_header,
- A52_HEADER_SIZE ) != VLC_SUCCESS )
+ VLC_A52_HEADER_SIZE ) != VLC_SUCCESS )
{
/* Need more data */
return NULL;
}
/* Check if frame is valid and get frame info */
- p_sys->i_frame_size = SyncInfo( p_header,
- &p_sys->i_channels,
- &p_sys->i_channels_conf,
- &p_sys->i_rate,
- &p_sys->i_bit_rate );
- if( !p_sys->i_frame_size )
+ if( vlc_a52_header_Parse( &p_sys->frame, p_header, VLC_A52_HEADER_SIZE ) )
{
msg_Dbg( p_dec, "emulated sync word" );
block_SkipByte( &p_sys->bytestream );
p_sys->i_state = STATE_NOSYNC;
break;
}
+
p_sys->i_state = STATE_NEXT_SYNC;
case STATE_NEXT_SYNC:
/* Check if next expected frame contains the sync word */
if( block_PeekOffsetBytes( &p_sys->bytestream,
- p_sys->i_frame_size, p_header, 2 )
+ p_sys->frame.i_size, p_header, 2 )
!= VLC_SUCCESS )
{
/* Need more data */
/* Make sure we have enough data.
* (Not useful if we went through NEXT_SYNC) */
if( block_WaitBytes( &p_sys->bytestream,
- p_sys->i_frame_size ) != VLC_SUCCESS )
+ p_sys->frame.i_size ) != VLC_SUCCESS )
{
/* Need more data */
return NULL;
/* Copy the whole frame into the buffer. When we reach this point
* we already know we have enough data available. */
- block_GetBytes( &p_sys->bytestream, p_buf, p_sys->i_frame_size );
+ block_GetBytes( &p_sys->bytestream, p_buf, p_sys->frame.i_size );
/* Make sure we don't reuse the same pts twice */
if( p_sys->i_pts == p_sys->bytestream.p_block->i_pts )
decoder_sys_t *p_sys = p_dec->p_sys;
uint8_t *p_buf;
- if( p_dec->fmt_out.audio.i_rate != p_sys->i_rate )
+ if( p_dec->fmt_out.audio.i_rate != p_sys->frame.i_rate )
{
msg_Info( p_dec, "A/52 channels:%d samplerate:%d bitrate:%d",
- p_sys->i_channels, p_sys->i_rate, p_sys->i_bit_rate );
+ p_sys->frame.i_channels, p_sys->frame.i_rate, p_sys->frame.i_bitrate );
- aout_DateInit( &p_sys->end_date, p_sys->i_rate );
+ aout_DateInit( &p_sys->end_date, p_sys->frame.i_rate );
aout_DateSet( &p_sys->end_date, p_sys->i_pts );
}
- p_dec->fmt_out.audio.i_rate = p_sys->i_rate;
- p_dec->fmt_out.audio.i_channels = p_sys->i_channels;
- if( p_dec->fmt_out.audio.i_bytes_per_frame < p_sys->i_frame_size )
- p_dec->fmt_out.audio.i_bytes_per_frame = p_sys->i_frame_size;
+ p_dec->fmt_out.audio.i_rate = p_sys->frame.i_rate;
+ p_dec->fmt_out.audio.i_channels = p_sys->frame.i_channels;
+ if( p_dec->fmt_out.audio.i_bytes_per_frame < p_sys->frame.i_size )
+ p_dec->fmt_out.audio.i_bytes_per_frame = p_sys->frame.i_size;
p_dec->fmt_out.audio.i_frame_length = A52_FRAME_NB;
- p_dec->fmt_out.audio.i_original_channels = p_sys->i_channels_conf;
+ p_dec->fmt_out.audio.i_original_channels = p_sys->frame.i_channels_conf;
p_dec->fmt_out.audio.i_physical_channels =
- p_sys->i_channels_conf & AOUT_CHAN_PHYSMASK;
+ p_sys->frame.i_channels_conf & AOUT_CHAN_PHYSMASK;
- p_dec->fmt_out.i_bitrate = p_sys->i_bit_rate;
+ p_dec->fmt_out.i_bitrate = p_sys->frame.i_bitrate;
if( p_sys->b_packetizer )
{
decoder_sys_t *p_sys = p_dec->p_sys;
block_t *p_block;
- p_block = block_New( p_dec, p_sys->i_frame_size );
+ p_block = block_New( p_dec, p_sys->frame.i_size );
if( p_block == NULL ) return NULL;
p_block->i_pts = p_block->i_dts = aout_DateGet( &p_sys->end_date );
return p_block;
}
-/* Tables */
-static const struct
-{
- unsigned int i_count;
- unsigned int i_configuration;
-} p_acmod[8] = {
- { 2, AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_DUALMONO }, /* Dual-channel 1+1 */
- { 1, AOUT_CHAN_CENTER }, /* Mono 1/0 */
- { 2, AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT }, /* Stereo 2/0 */
- { 3, AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER }, /* 3F 3/0 */
- { 3, AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_REARCENTER }, /* 2F1R 2/1 */
- { 4, AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER |
- AOUT_CHAN_REARCENTER }, /* 3F1R 3/1 */
- { 5, AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT |
- AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT }, /* 2F2R 2/2 */
- { 6, AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER |
- AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT }, /* 3F2R 3/2 */
-};
-
-/**
- * It parse AC3 sync info.
- *
- * This code is borrowed from liba52 by Aaron Holtzman & Michel Lespinasse,
- * since we don't want to oblige S/PDIF people to use liba52 just to get
- * their SyncInfo...
- */
-static int SyncInfoAC3( const uint8_t *p_buf,
- unsigned int *pi_channels,
- unsigned int *pi_channels_conf,
- unsigned int *pi_sample_rate, int *pi_bit_rate )
-{
- static const uint8_t halfrate[12] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 3 };
- static const int rate[] = { 32, 40, 48, 56, 64, 80, 96, 112,
- 128, 160, 192, 224, 256, 320, 384, 448,
- 512, 576, 640 };
- static const uint8_t lfeon[8] = { 0x10, 0x10, 0x04, 0x04,
- 0x04, 0x01, 0x04, 0x01 };
- int frmsizecod;
- int bitrate;
- int half;
- int acmod;
-
- /* */
- half = halfrate[p_buf[5] >> 3];
-
- /* acmod, dsurmod and lfeon */
- acmod = p_buf[6] >> 5;
- if ( (p_buf[6] & 0xf8) == 0x50 )
- {
- /* Dolby surround = stereo + Dolby */
- *pi_channels = 2;
- *pi_channels_conf = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
- | AOUT_CHAN_DOLBYSTEREO;
- }
- else
- {
- *pi_channels = p_acmod[acmod].i_count;
- *pi_channels_conf = p_acmod[acmod].i_configuration;
- }
-
- if ( p_buf[6] & lfeon[acmod] )
- {
- (*pi_channels)++;
- *pi_channels_conf |= AOUT_CHAN_LFE;
- }
-
- frmsizecod = p_buf[4] & 63;
- if (frmsizecod >= 38)
- return 0;
- bitrate = rate [frmsizecod >> 1];
- *pi_bit_rate = (bitrate * 1000) >> half;
-
- switch (p_buf[4] & 0xc0) {
- case 0:
- *pi_sample_rate = 48000 >> half;
- return 4 * bitrate;
- case 0x40:
- *pi_sample_rate = 44100 >> half;
- return 2 * (320 * bitrate / 147 + (frmsizecod & 1));
- case 0x80:
- *pi_sample_rate = 32000 >> half;
- return 6 * bitrate;
- default:
- return 0;
- }
-}
-
-/**
- * It parse E-AC3 sync info
- */
-static int SyncInfoEAC3( const uint8_t *p_buf,
- unsigned int *pi_channels,
- unsigned int *pi_channels_conf,
- unsigned int *pi_sample_rate, int *pi_bit_rate )
-{
- static const int pi_samplerate[3] = { 48000, 44100, 32000 };
- bs_t s;
- int i_frame_size;
- int i_fscod, i_fscod2;
- int i_numblkscod;
- int i_acmod, i_lfeon;
- int i_bytes;
-
-
- bs_init( &s, (void*)p_buf, A52_HEADER_SIZE );
- bs_skip( &s, 16 + /* start code */
- 2 + /* stream type */
- 3 ); /* substream id */
- i_frame_size = bs_read( &s, 11 );
- if( i_frame_size < 2 )
- return 0;
- i_bytes = 2 * ( i_frame_size + 1 );
-
- i_fscod = bs_read( &s, 2 );
- if( i_fscod == 0x03 )
- {
- i_fscod2 = bs_read( &s, 2 );
- if( i_fscod2 == 0X03 )
- return 0;
- *pi_sample_rate = pi_samplerate[i_fscod2] / 2;
- i_numblkscod = 6;
- }
- else
- {
- static const int pi_blocks[4] = { 1, 2, 3, 6 };
-
- *pi_sample_rate = pi_samplerate[i_fscod];
- i_numblkscod = pi_blocks[bs_read( &s, 2 )];
- }
-
- i_acmod = bs_read( &s, 3 );
- i_lfeon = bs_read1( &s );
-
- *pi_channels = p_acmod[i_acmod].i_count + i_lfeon;
- *pi_channels_conf = p_acmod[i_acmod].i_configuration | ( i_lfeon ? AOUT_CHAN_LFE : 0);
- *pi_bit_rate = 8 * i_bytes * (*pi_sample_rate) / (i_numblkscod * 256);
-
- return i_bytes;
-}
-
-static int SyncInfo( const uint8_t *p_buf,
- unsigned int *pi_channels,
- unsigned int *pi_channels_conf,
- unsigned int *pi_sample_rate, int *pi_bit_rate )
-{
- int bsid;
-
- /* Check synword */
- if( p_buf[0] != 0x0b || p_buf[1] != 0x77 )
- return 0;
-
- /* Check bsid */
- bsid = p_buf[5] >> 3;
- if( bsid > 16 )
- return 0;
-
- if( bsid <= 10 )
- return SyncInfoAC3( p_buf, pi_channels, pi_channels_conf,
- pi_sample_rate, pi_bit_rate );
- else
- return SyncInfoEAC3( p_buf, pi_channels, pi_channels_conf,
- pi_sample_rate, pi_bit_rate );
-}
-
--- /dev/null
+/*****************************************************************************
+ * a52.h
+ *****************************************************************************
+ * Copyright (C) 2001-2009 Laurent Aimar
+ * $Id$
+ *
+ * Authors: Stéphane Borel <stef@via.ecp.fr>
+ * Christophe Massiot <massiot@via.ecp.fr>
+ * Gildas Bazin <gbazin@videolan.org>
+ * Laurent Aimar <fenrir@via.ecp.fr>
+ *
+ * This program 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.
+ *
+ * This program 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., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
+ *****************************************************************************/
+
+#ifndef _VLC_A52_H
+#define _VLC_A52_H 1
+
+#include <vlc_aout.h>
+#include <vlc_bits.h>
+
+typedef struct
+{
+ unsigned int i_count;
+ unsigned int i_configuration;
+} vlc_a52_acmod_t;
+
+/**
+ * Minimum AC3 header size that vlc_a52_header_Parse needs.
+ */
+#define VLC_A52_HEADER_SIZE (8)
+
+/**
+ * AC3 header information.
+ */
+typedef struct
+{
+ bool b_eac3;
+
+ unsigned int i_channels;
+ unsigned int i_channels_conf;
+ unsigned int i_rate;
+ unsigned int i_bitrate;
+
+ unsigned int i_size;
+
+} vlc_a52_header_t;
+
+/**
+ * It parse AC3 sync info.
+ *
+ * This code is borrowed from liba52 by Aaron Holtzman & Michel Lespinasse,
+ * since we don't want to oblige S/PDIF people to use liba52 just to get
+ * their SyncInfo...
+ */
+static inline int vlc_a52_header_ParseAc3( vlc_a52_header_t *p_header,
+ const uint8_t *p_buf,
+ const vlc_a52_acmod_t *p_acmod )
+{
+ static const uint8_t pi_halfrate[12] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 3 };
+ static const unsigned int pi_bitrate[] = { 32, 40, 48, 56, 64, 80, 96, 112,
+ 128, 160, 192, 224, 256, 320, 384, 448,
+ 512, 576, 640 };
+ static const uint8_t pi_lfeon[8] = { 0x10, 0x10, 0x04, 0x04,
+ 0x04, 0x01, 0x04, 0x01 };
+
+ /* */
+ const unsigned i_rate_shift = pi_halfrate[p_buf[5] >> 3];
+
+ /* acmod, dsurmod and lfeon */
+ const unsigned i_acmod = p_buf[6] >> 5;
+ if( (p_buf[6] & 0xf8) == 0x50 )
+ {
+ /* Dolby surround = stereo + Dolby */
+ p_header->i_channels = 2;
+ p_header->i_channels_conf = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
+ | AOUT_CHAN_DOLBYSTEREO;
+ }
+ else
+ {
+ p_header->i_channels = p_acmod[i_acmod].i_count;
+ p_header->i_channels_conf = p_acmod[i_acmod].i_configuration;
+ }
+
+ if( p_buf[6] & pi_lfeon[i_acmod] )
+ {
+ p_header->i_channels++;
+ p_header->i_channels_conf |= AOUT_CHAN_LFE;
+ }
+
+ const unsigned i_frmsizecod = p_buf[4] & 63;
+ if( i_frmsizecod >= 38 )
+ return VLC_EGENERIC;
+ const unsigned i_bitrate_base = pi_bitrate[i_frmsizecod >> 1];
+ p_header->i_bitrate = (i_bitrate_base * 1000) >> i_rate_shift;
+
+ switch( p_buf[4] & 0xc0 )
+ {
+ case 0:
+ p_header->i_rate = 48000 >> i_rate_shift;
+ p_header->i_size = 4 * i_bitrate_base;
+ break;
+ case 0x40:
+ p_header->i_rate = 44100 >> i_rate_shift;
+ p_header->i_size = 2 * (320 * i_bitrate_base / 147 + (i_frmsizecod & 1));
+ break;
+ case 0x80:
+ p_header->i_rate = 32000 >> i_rate_shift;
+ p_header->i_size = 6 * i_bitrate_base;
+ break;
+ default:
+ return VLC_EGENERIC;
+ }
+ p_header->b_eac3 = false;
+ return VLC_SUCCESS;
+}
+
+/**
+ * It parse E-AC3 sync info
+ */
+static inline int vlc_a52_header_ParseEac3( vlc_a52_header_t *p_header,
+ const uint8_t *p_buf,
+ const vlc_a52_acmod_t *p_acmod )
+{
+ static const unsigned pi_samplerate[3] = { 48000, 44100, 32000 };
+ unsigned i_numblkscod;
+ bs_t s;
+
+
+ bs_init( &s, (void*)p_buf, VLC_A52_HEADER_SIZE );
+ bs_skip( &s, 16 + /* start code */
+ 2 + /* stream type */
+ 3 ); /* substream id */
+ const unsigned i_frame_size = bs_read( &s, 11 );
+ if( i_frame_size < 2 )
+ return VLC_EGENERIC;
+ p_header->i_size = 2 * ( i_frame_size + 1 );
+
+ const unsigned i_fscod = bs_read( &s, 2 );
+ if( i_fscod == 0x03 )
+ {
+ const unsigned i_fscod2 = bs_read( &s, 2 );
+ if( i_fscod2 == 0X03 )
+ return VLC_EGENERIC;
+ p_header->i_rate = pi_samplerate[i_fscod2] / 2;
+ i_numblkscod = 6;
+ }
+ else
+ {
+ static const int pi_blocks[4] = { 1, 2, 3, 6 };
+
+ p_header->i_rate = pi_samplerate[i_fscod];
+ i_numblkscod = pi_blocks[bs_read( &s, 2 )];
+ }
+
+ const unsigned i_acmod = bs_read( &s, 3 );
+ const unsigned i_lfeon = bs_read1( &s );
+
+ p_header->i_channels = p_acmod[i_acmod].i_count + i_lfeon;
+ p_header->i_channels_conf = p_acmod[i_acmod].i_configuration | ( i_lfeon ? AOUT_CHAN_LFE : 0);
+ p_header->i_bitrate = 8 * p_header->i_size * (p_header->i_rate) / (i_numblkscod * 256);
+
+ p_header->b_eac3 = true;
+ return VLC_SUCCESS;
+}
+
+/**
+ * It will parse the header AC3 frame and fill vlc_a52_header_t* if
+ * it is valid or return VLC_EGENERIC.
+ *
+ * XXX It will only recognize big endian bitstream ie starting with 0x0b, 0x77
+ */
+static inline int vlc_a52_header_Parse( vlc_a52_header_t *p_header,
+ const uint8_t *p_buffer, int i_buffer )
+{
+ static const vlc_a52_acmod_t p_acmod[8] = {
+ { 2, AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_DUALMONO }, /* Dual-channel 1+1 */
+ { 1, AOUT_CHAN_CENTER }, /* Mono 1/0 */
+ { 2, AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT }, /* Stereo 2/0 */
+ { 3, AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER }, /* 3F 3/0 */
+ { 3, AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_REARCENTER }, /* 2F1R 2/1 */
+ { 4, AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER |
+ AOUT_CHAN_REARCENTER }, /* 3F1R 3/1 */
+ { 5, AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT |
+ AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT }, /* 2F2R 2/2 */
+ { 6, AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER |
+ AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT }, /* 3F2R 3/2 */
+ };
+
+ if( i_buffer < VLC_A52_HEADER_SIZE )
+ return VLC_EGENERIC;
+
+ /* Check synword */
+ if( p_buffer[0] != 0x0b || p_buffer[1] != 0x77 )
+ return VLC_EGENERIC;
+
+ /* Check bsid */
+ const int bsid = p_buffer[5] >> 3;
+ if( bsid > 16 )
+ return VLC_EGENERIC;
+
+ if( bsid <= 10 )
+ {
+ if( vlc_a52_header_ParseAc3( p_header, p_buffer, p_acmod ) )
+ return VLC_EGENERIC;
+ }
+ else
+ {
+ if( vlc_a52_header_ParseEac3( p_header, p_buffer, p_acmod ) )
+ return VLC_EGENERIC;
+ }
+ return VLC_SUCCESS;
+}
+
+#endif
+
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