1 /*****************************************************************************
2 * es.c : Generic audio ES input module for vlc
3 *****************************************************************************
4 * Copyright (C) 2001-2008 the VideoLAN team
7 * Authors: Laurent Aimar <fenrir@via.ecp.fr>
8 * Gildas Bazin <gbazin@videolan.org>
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
23 *****************************************************************************/
25 /*****************************************************************************
27 *****************************************************************************/
33 #include <vlc_common.h>
34 #include <vlc_plugin.h>
35 #include <vlc_demux.h>
36 #include <vlc_codec.h>
37 #include <vlc_input.h>
39 /*****************************************************************************
41 *****************************************************************************/
42 static int Open ( vlc_object_t * );
43 static void Close( vlc_object_t * );
46 set_category( CAT_INPUT )
47 set_subcategory( SUBCAT_INPUT_DEMUX )
48 set_description( N_("MPEG-I/II/4 / A52 / DTS audio" ) )
49 set_capability( "demux", 155 )
50 set_callbacks( Open, Close )
52 add_shortcut( "mpga" )
56 add_shortcut( "mp4a" )
62 add_shortcut( "eac3" )
67 /*****************************************************************************
69 *****************************************************************************/
70 static int Demux ( demux_t * );
71 static int Control( demux_t *, int, va_list );
78 int (*pf_probe)( demux_t *p_demux, int64_t *pi_offset );
79 int (*pf_init)( demux_t *p_demux );
89 decoder_t *p_packetizer;
92 mtime_t i_time_offset;
96 bool b_estimate_bitrate;
97 int i_bitrate_avg; /* extracted from Xing header */
99 bool b_initial_sync_failed;
103 int64_t i_stream_offset;
115 static int MpgaProbe( demux_t *p_demux, int64_t *pi_offset );
116 static int MpgaInit( demux_t *p_demux );
118 static int AacProbe( demux_t *p_demux, int64_t *pi_offset );
119 static int AacInit( demux_t *p_demux );
121 static int EA52Probe( demux_t *p_demux, int64_t *pi_offset );
122 static int A52Probe( demux_t *p_demux, int64_t *pi_offset );
123 static int A52Init( demux_t *p_demux );
125 static int DtsProbe( demux_t *p_demux, int64_t *pi_offset );
126 static int DtsInit( demux_t *p_demux );
128 static const codec_t p_codec[] = {
129 { VLC_FOURCC( 'm', 'p', '4', 'a' ), false, "mp4 audio", AacProbe, AacInit },
130 { VLC_FOURCC( 'm', 'p', 'g', 'a' ), false, "mpeg audio", MpgaProbe, MpgaInit },
131 { VLC_FOURCC( 'a', '5', '2', ' ' ), true, "a52 audio", A52Probe, A52Init },
132 { VLC_FOURCC( 'e', 'a', 'c', '3' ), true, "eac3 audio", EA52Probe, A52Init },
133 { VLC_FOURCC( 'd', 't', 's', ' ' ), false, "dts audio", DtsProbe, DtsInit },
135 { 0, false, NULL, NULL, NULL }
138 /*****************************************************************************
139 * Open: initializes demux structures
140 *****************************************************************************/
141 static int Open( vlc_object_t * p_this )
143 demux_t *p_demux = (demux_t*)p_this;
150 for( i_index = 0; p_codec[i_index].i_codec != 0; i_index++ )
152 if( !p_codec[i_index].pf_probe( p_demux, &i_offset ) )
156 if( p_codec[i_index].i_codec == 0 )
159 DEMUX_INIT_COMMON(); p_sys = p_demux->p_sys;
160 memset( p_sys, 0, sizeof( demux_sys_t ) );
161 p_sys->codec = p_codec[i_index];
163 p_sys->b_start = true;
164 p_sys->i_stream_offset = i_offset;
165 p_sys->b_estimate_bitrate = true;
166 p_sys->i_bitrate_avg = 0;
167 p_sys->b_big_endian = false;
169 if( stream_Seek( p_demux->s, p_sys->i_stream_offset ) )
175 if( p_sys->codec.pf_init( p_demux ) )
181 msg_Dbg( p_demux, "detected format %4.4s", (const char*)&p_sys->codec.i_codec );
183 /* Load the audio packetizer */
184 es_format_Init( &fmt, AUDIO_ES, p_sys->codec.i_codec );
185 p_sys->p_packetizer = demux_PacketizerNew( p_demux, &fmt, p_sys->codec.psz_name );
186 if( !p_sys->p_packetizer )
194 /*****************************************************************************
195 * Demux: reads and demuxes data packets
196 *****************************************************************************
197 * Returns -1 in case of error, 0 in case of EOF, 1 otherwise
198 *****************************************************************************/
199 static int Demux( demux_t *p_demux )
201 demux_sys_t *p_sys = p_demux->p_sys;
202 block_t *p_block_in, *p_block_out;
204 if( p_sys->codec.b_use_word )
206 /* Make sure we are word aligned */
207 int64_t i_pos = stream_Tell( p_demux->s );
209 stream_Read( p_demux->s, NULL, 1 );
212 if( ( p_block_in = stream_Block( p_demux->s, p_sys->i_packet_size ) ) == NULL )
215 if( p_sys->codec.b_use_word && !p_sys->b_big_endian && p_block_in->i_buffer > 0 )
217 /* Convert to big endian */
219 swab( p_block_in->p_buffer, p_block_in->p_buffer, p_block_in->i_buffer );
221 uint8_t *p_tmp = p_block_in->p_buffer;
222 for( int i = p_block_in->i_buffer / 2 ; i-- ; )
224 uint8_t tmp = p_tmp[0];
232 p_block_in->i_pts = p_block_in->i_dts = p_sys->b_start || p_sys->b_initial_sync_failed ? 1 : 0;
233 p_sys->b_initial_sync_failed = p_sys->b_start; /* Only try to resync once */
235 while( ( p_block_out = p_sys->p_packetizer->pf_packetize( p_sys->p_packetizer, &p_block_in ) ) )
237 p_sys->b_initial_sync_failed = false;
240 block_t *p_next = p_block_out->p_next;
244 p_sys->p_packetizer->fmt_out.b_packetized = true;
245 p_sys->p_es = es_out_Add( p_demux->out,
246 &p_sys->p_packetizer->fmt_out);
249 /* Try the xing header */
250 if( p_sys->xing.i_bytes && p_sys->xing.i_frames &&
251 p_sys->xing.i_frame_samples )
253 p_sys->i_bitrate_avg = p_sys->xing.i_bytes * INT64_C(8) *
254 p_sys->p_packetizer->fmt_out.audio.i_rate /
255 p_sys->xing.i_frames / p_sys->xing.i_frame_samples;
257 if( p_sys->i_bitrate_avg > 0 )
258 p_sys->b_estimate_bitrate = false;
260 /* Use the bitrate as initual value */
261 if( p_sys->b_estimate_bitrate )
262 p_sys->i_bitrate_avg = p_sys->p_packetizer->fmt_out.i_bitrate;
265 p_sys->i_pts = p_block_out->i_pts;
267 /* Re-estimate bitrate */
268 if( p_sys->b_estimate_bitrate && p_sys->i_pts > 1 + INT64_C(500000) )
269 p_sys->i_bitrate_avg = 8*INT64_C(1000000)*p_sys->i_bytes/(p_sys->i_pts-1);
270 p_sys->i_bytes += p_block_out->i_buffer;
272 /* Correct timestamp */
273 p_block_out->i_pts += p_sys->i_time_offset;
274 p_block_out->i_dts += p_sys->i_time_offset;
276 es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_block_out->i_dts );
278 es_out_Send( p_demux->out, p_sys->p_es, p_block_out );
280 p_block_out = p_next;
284 if( p_sys->b_initial_sync_failed )
285 msg_Dbg( p_demux, "did not sync on first block" );
286 p_sys->b_start = false;
290 /*****************************************************************************
291 * Close: frees unused data
292 *****************************************************************************/
293 static void Close( vlc_object_t * p_this )
295 demux_t *p_demux = (demux_t*)p_this;
296 demux_sys_t *p_sys = p_demux->p_sys;
298 demux_PacketizerDestroy( p_sys->p_packetizer );
302 /*****************************************************************************
304 *****************************************************************************/
305 static int Control( demux_t *p_demux, int i_query, va_list args )
307 demux_sys_t *p_sys = p_demux->p_sys;
313 va_copy ( args_save, args );
317 case DEMUX_HAS_UNSUPPORTED_META:
318 pb_bool = (bool*)va_arg( args, bool* );
323 pi64 = (int64_t*)va_arg( args, int64_t * );
324 *pi64 = p_sys->i_pts + p_sys->i_time_offset;
327 case DEMUX_GET_LENGTH:
328 i_ret = demux_vaControlHelper( p_demux->s, p_sys->i_stream_offset, -1,
329 p_sys->i_bitrate_avg, 1, i_query,
331 /* No bitrate, we can't have it precisely, but we can compute
332 * a raw approximation with time/position */
333 if( i_ret && !p_sys->i_bitrate_avg )
335 float f_pos = (double)(uint64_t)( stream_Tell( p_demux->s ) ) /
336 (double)(uint64_t)( stream_Size( p_demux->s ) );
337 /* The first few seconds are guaranteed to be very whacky,
338 * don't bother trying ... Too bad */
340 (p_sys->i_pts + p_sys->i_time_offset) < 8000000 )
343 pi64 = (int64_t *)va_arg( args_save, int64_t * );
344 *pi64 = (p_sys->i_pts + p_sys->i_time_offset) / f_pos;
351 /* FIXME TODO: implement a high precision seek (with mp3 parsing)
352 * needed for multi-input */
354 i_ret = demux_vaControlHelper( p_demux->s, p_sys->i_stream_offset, -1,
355 p_sys->i_bitrate_avg, 1, i_query,
357 if( !i_ret && p_sys->i_bitrate_avg > 0 &&
358 (i_query == DEMUX_SET_POSITION || i_query == DEMUX_SET_TIME) )
360 int64_t i_time = INT64_C(8000000) * ( stream_Tell(p_demux->s) - p_sys->i_stream_offset ) /
361 p_sys->i_bitrate_avg;
363 /* Fix time_offset */
365 p_sys->i_time_offset = i_time - p_sys->i_pts;
371 /*****************************************************************************
373 *****************************************************************************/
374 static int MpgaCheckSync( const uint8_t *p_peek )
376 uint32_t h = GetDWBE( p_peek );
378 if( ((( h >> 21 )&0x07FF) != 0x07FF ) /* header sync */
379 || (((h >> 17)&0x03) == 0 ) /* valid layer ?*/
380 || (((h >> 12)&0x0F) == 0x0F )
381 || (((h >> 12)&0x0F) == 0x00 ) /* valid bitrate ? */
382 || (((h >> 10) & 0x03) == 0x03 ) /* valide sampling freq ? */
383 || ((h & 0x03) == 0x02 )) /* valid emphasis ? */
390 #define MPGA_VERSION( h ) ( 1 - (((h)>>19)&0x01) )
391 #define MPGA_MODE(h) (((h)>> 6)&0x03)
393 static int MpgaGetFrameSamples( uint32_t h )
395 const int i_layer = 3 - (((h)>>17)&0x03);
403 return MPGA_VERSION(h) ? 576 : 1152;
409 static int MpgaProbe( demux_t *p_demux, int64_t *pi_offset )
415 const uint8_t *p_peek;
417 b_forced = demux_IsPathExtension( p_demux, ".mp3" );
418 b_forced_demux = demux_IsForced( p_demux, "mp3" ) ||
419 demux_IsForced( p_demux, "mpga" );
421 i_offset = stream_Tell( p_demux->s );
422 if( stream_Peek( p_demux->s, &p_peek, 4 ) < 4 )
425 if( !MpgaCheckSync( p_peek ) )
430 if( !b_forced_demux && !b_forced )
433 i_peek = stream_Peek( p_demux->s, &p_peek, 8096 );
436 if( MpgaCheckSync( p_peek ) )
445 if( !b_ok && !b_forced_demux )
448 *pi_offset = i_offset;
452 static void MpgaXingSkip( const uint8_t **pp_xing, int *pi_xing, int i_count )
454 if(i_count > *pi_xing )
457 (*pp_xing) += i_count;
458 (*pi_xing) -= i_count;
461 static uint32_t MpgaXingGetDWBE( const uint8_t **pp_xing, int *pi_xing, uint32_t i_default )
466 uint32_t v = GetDWBE( *pp_xing );
468 MpgaXingSkip( pp_xing, pi_xing, 4 );
473 static int MpgaInit( demux_t *p_demux )
475 demux_sys_t *p_sys = p_demux->p_sys;
477 const uint8_t *p_peek;
481 p_sys->i_packet_size = 1024;
483 /* Load a potential xing header */
484 i_peek = stream_Peek( p_demux->s, &p_peek, 4 + 1024 );
485 if( i_peek < 4 + 21 )
488 const uint32_t header = GetDWBE( p_peek );
489 if( !MpgaCheckSync( p_peek ) )
493 const uint8_t *p_xing = p_peek;
497 if( MPGA_VERSION( header ) == 0 )
498 i_skip = MPGA_MODE( header ) != 3 ? 36 : 21;
500 i_skip = MPGA_MODE( header ) != 3 ? 21 : 13;
502 if( i_skip + 8 >= i_xing || memcmp( &p_xing[i_skip], "Xing", 4 ) )
505 const uint32_t i_flags = GetDWBE( &p_xing[i_skip+4] );
507 MpgaXingSkip( &p_xing, &i_xing, i_skip + 8 );
510 p_sys->xing.i_frames = MpgaXingGetDWBE( &p_xing, &i_xing, 0 );
512 p_sys->xing.i_bytes = MpgaXingGetDWBE( &p_xing, &i_xing, 0 );
513 if( i_flags&0x04 ) /* TODO Support XING TOC to improve seeking accuracy */
514 MpgaXingSkip( &p_xing, &i_xing, 100 );
517 /* FIXME: doesn't return the right bitrage average, at least
519 p_sys->xing.i_bitrate_avg = MpgaXingGetDWBE( &p_xing, &i_xing, 0 );
520 msg_Dbg( p_demux, "xing vbr value present (%d)",
521 p_sys->xing.i_bitrate_avg );
524 if( p_sys->xing.i_frames > 0 && p_sys->xing.i_bytes > 0 )
526 p_sys->xing.i_frame_samples = MpgaGetFrameSamples( header );
527 msg_Dbg( p_demux, "xing frames&bytes value present "
528 "(%d bytes, %d frames, %d samples/frame)",
529 p_sys->xing.i_bytes, p_sys->xing.i_frames,
530 p_sys->xing.i_frame_samples );
535 /*****************************************************************************
537 *****************************************************************************/
538 static int AacProbe( demux_t *p_demux, int64_t *pi_offset )
544 const uint8_t *p_peek;
546 b_forced = demux_IsPathExtension( p_demux, ".aac" ) ||
547 demux_IsPathExtension( p_demux, ".aacp" );
548 b_forced_demux = demux_IsForced( p_demux, "m4a" ) ||
549 demux_IsForced( p_demux, "aac" ) ||
550 demux_IsForced( p_demux, "mp4a" );
552 if( !b_forced_demux && !b_forced )
555 i_offset = stream_Tell( p_demux->s );
557 /* peek the begining (10 is for adts header) */
558 if( stream_Peek( p_demux->s, &p_peek, 10 ) < 10 )
560 msg_Err( p_demux, "cannot peek" );
563 if( !strncmp( (char *)p_peek, "ADIF", 4 ) )
565 msg_Err( p_demux, "ADIF file. Not yet supported. (Please report)" );
569 *pi_offset = i_offset;
572 static int AacInit( demux_t *p_demux )
574 demux_sys_t *p_sys = p_demux->p_sys;
576 p_sys->i_packet_size = 4096;
581 /*****************************************************************************
583 *****************************************************************************/
584 #define WAV_PROBE_SIZE (512*1024)
585 static int WavSkipHeader( demux_t *p_demux, int *pi_skip )
587 const uint8_t *p_peek;
593 /* Check if we are dealing with a WAV file */
594 if( stream_Peek( p_demux->s, &p_peek, 12+8 ) != 12 + 8 )
597 if( memcmp( p_peek, "RIFF", 4 ) || memcmp( &p_peek[8], "WAVE", 4 ) )
600 /* Find the wave format header */
602 while( memcmp( p_peek + i_peek - 8, "fmt ", 4 ) )
604 uint32_t i_len = GetDWLE( p_peek + i_peek - 4 );
605 if( i_len > WAV_PROBE_SIZE || i_peek + i_len > WAV_PROBE_SIZE )
609 if( stream_Peek( p_demux->s, &p_peek, i_peek ) != i_peek )
613 /* Sanity check the wave format header */
614 uint32_t i_len = GetDWLE( p_peek + i_peek - 4 );
615 if( i_len > WAV_PROBE_SIZE )
619 if( stream_Peek( p_demux->s, &p_peek, i_peek ) != i_peek )
621 if( GetWLE( p_peek + i_peek - i_len - 8 /* wFormatTag */ ) !=
622 1 /* WAVE_FORMAT_PCM */ )
624 if( GetWLE( p_peek + i_peek - i_len - 6 /* nChannels */ ) != 2 )
626 if( GetDWLE( p_peek + i_peek - i_len - 4 /* nSamplesPerSec */ ) !=
630 /* Skip the wave header */
631 while( memcmp( p_peek + i_peek - 8, "data", 4 ) )
633 uint32_t i_len = GetDWLE( p_peek + i_peek - 4 );
634 if( i_len > WAV_PROBE_SIZE || i_peek + i_len > WAV_PROBE_SIZE )
638 if( stream_Peek( p_demux->s, &p_peek, i_peek ) != i_peek )
645 static int GenericProbe( demux_t *p_demux, int64_t *pi_offset,
646 const char * ppsz_name[],
647 bool (*pf_check)( const uint8_t * ), int i_check_size )
652 const uint8_t *p_peek;
655 b_forced_demux = false;
656 for( int i = 0; ppsz_name[i] != NULL; i++ )
658 b_forced_demux |= demux_IsForced( p_demux, ppsz_name[i] );
661 i_offset = stream_Tell( p_demux->s );
663 if( WavSkipHeader( p_demux, &i_skip ) )
665 if( !b_forced_demux )
669 /* peek the begining */
670 if( stream_Peek( p_demux->s, &p_peek, i_skip + i_check_size ) < i_skip + i_check_size )
672 msg_Err( p_demux, "cannot peek" );
675 if( !pf_check( &p_peek[i_skip] ) )
677 if( !b_forced_demux )
681 *pi_offset = i_offset + i_skip;
685 /*****************************************************************************
687 *****************************************************************************/
688 static bool A52CheckSync( const uint8_t *p_peek, bool *p_big_endian, bool b_eac3 )
690 /* bsid: 0-8 11-16 */
692 /* Little endian version of the bitstream */
693 if( p_peek[0] == 0x77 && p_peek[1] == 0x0b &&
694 ( p_peek[4] >> 3 ) <= ( b_eac3 ? 16 : 10 ) /* bsid */ )
696 *p_big_endian = false;
699 /* Big endian version of the bitstream */
700 else if( p_peek[0] == 0x0b && p_peek[1] == 0x77 &&
701 ( p_peek[5] >> 3 ) <= ( b_eac3 ? 16 : 10 ) /* bsid */ )
703 *p_big_endian = true;
709 static bool EA52CheckSyncProbe( const uint8_t *p_peek )
712 return A52CheckSync( p_peek, &b_dummy, true );
715 static int EA52Probe( demux_t *p_demux, int64_t *pi_offset )
717 const char *ppsz_name[] = { "eac3", NULL };
719 return GenericProbe( p_demux, pi_offset, ppsz_name, EA52CheckSyncProbe, 10 );
722 static bool A52CheckSyncProbe( const uint8_t *p_peek )
725 return A52CheckSync( p_peek, &b_dummy, false );
728 static int A52Probe( demux_t *p_demux, int64_t *pi_offset )
730 const char *ppsz_name[] = { "a52", "ac3", NULL };
732 return GenericProbe( p_demux, pi_offset, ppsz_name, A52CheckSyncProbe, 10 );
735 static int A52Init( demux_t *p_demux )
737 demux_sys_t *p_sys = p_demux->p_sys;
739 p_sys->b_big_endian = false;
740 p_sys->i_packet_size = 1024;
742 const uint8_t *p_peek;
744 /* peek the begining (10 is for a52 header) */
745 if( stream_Peek( p_demux->s, &p_peek, 10 ) >= 10 )
747 A52CheckSync( p_peek, &p_sys->b_big_endian, true );
752 /*****************************************************************************
754 *****************************************************************************/
755 static bool DtsCheckSync( const uint8_t *p_peek )
757 /* 14 bits, little endian version of the bitstream */
758 if( p_peek[0] == 0xff && p_peek[1] == 0x1f &&
759 p_peek[2] == 0x00 && p_peek[3] == 0xe8 &&
760 (p_peek[4] & 0xf0) == 0xf0 && p_peek[5] == 0x07 )
764 /* 14 bits, big endian version of the bitstream */
765 else if( p_peek[0] == 0x1f && p_peek[1] == 0xff &&
766 p_peek[2] == 0xe8 && p_peek[3] == 0x00 &&
767 p_peek[4] == 0x07 && (p_peek[5] & 0xf0) == 0xf0)
771 /* 16 bits, big endian version of the bitstream */
772 else if( p_peek[0] == 0x7f && p_peek[1] == 0xfe &&
773 p_peek[2] == 0x80 && p_peek[3] == 0x01 )
777 /* 16 bits, little endian version of the bitstream */
778 else if( p_peek[0] == 0xfe && p_peek[1] == 0x7f &&
779 p_peek[2] == 0x01 && p_peek[3] == 0x80 )
787 static int DtsProbe( demux_t *p_demux, int64_t *pi_offset )
789 const char *ppsz_name[] = { "dts", NULL };
791 return GenericProbe( p_demux, pi_offset, ppsz_name, DtsCheckSync, 11 );
793 static int DtsInit( demux_t *p_demux )
795 demux_sys_t *p_sys = p_demux->p_sys;
797 p_sys->i_packet_size = 16384;