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 / MLP audio" ) )
49 set_capability( "demux", 155 )
50 set_callbacks( Open, Close )
52 add_shortcut( "mpga" )
56 add_shortcut( "mp4a" )
62 add_shortcut( "eac3" )
69 /*****************************************************************************
71 *****************************************************************************/
72 static int Demux ( demux_t * );
73 static int Control( demux_t *, int, va_list );
80 int (*pf_probe)( demux_t *p_demux, int64_t *pi_offset );
81 int (*pf_init)( demux_t *p_demux );
91 decoder_t *p_packetizer;
94 mtime_t i_time_offset;
98 bool b_estimate_bitrate;
99 int i_bitrate_avg; /* extracted from Xing header */
101 bool b_initial_sync_failed;
105 int64_t i_stream_offset;
117 static int MpgaProbe( demux_t *p_demux, int64_t *pi_offset );
118 static int MpgaInit( demux_t *p_demux );
120 static int AacProbe( demux_t *p_demux, int64_t *pi_offset );
121 static int AacInit( demux_t *p_demux );
123 static int EA52Probe( demux_t *p_demux, int64_t *pi_offset );
124 static int A52Probe( demux_t *p_demux, int64_t *pi_offset );
125 static int A52Init( demux_t *p_demux );
127 static int DtsProbe( demux_t *p_demux, int64_t *pi_offset );
128 static int DtsInit( demux_t *p_demux );
130 static int MlpProbe( demux_t *p_demux, int64_t *pi_offset );
131 static int MlpInit( demux_t *p_demux );
133 static const codec_t p_codec[] = {
134 { VLC_FOURCC( 'm', 'p', '4', 'a' ), false, "mp4 audio", AacProbe, AacInit },
135 { VLC_FOURCC( 'm', 'p', 'g', 'a' ), false, "mpeg audio", MpgaProbe, MpgaInit },
136 { VLC_FOURCC( 'a', '5', '2', ' ' ), true, "a52 audio", A52Probe, A52Init },
137 { VLC_FOURCC( 'e', 'a', 'c', '3' ), true, "eac3 audio", EA52Probe, A52Init },
138 { VLC_FOURCC( 'd', 't', 's', ' ' ), false, "dts audio", DtsProbe, DtsInit },
139 { VLC_FOURCC( 'm', 'l', 'p', ' ' ), false, "mlp audio", MlpProbe, MlpInit },
141 { 0, false, NULL, NULL, NULL }
144 /*****************************************************************************
145 * Open: initializes demux structures
146 *****************************************************************************/
147 static int Open( vlc_object_t * p_this )
149 demux_t *p_demux = (demux_t*)p_this;
156 for( i_index = 0; p_codec[i_index].i_codec != 0; i_index++ )
158 if( !p_codec[i_index].pf_probe( p_demux, &i_offset ) )
162 if( p_codec[i_index].i_codec == 0 )
165 DEMUX_INIT_COMMON(); p_sys = p_demux->p_sys;
166 memset( p_sys, 0, sizeof( demux_sys_t ) );
167 p_sys->codec = p_codec[i_index];
169 p_sys->b_start = true;
170 p_sys->i_stream_offset = i_offset;
171 p_sys->b_estimate_bitrate = true;
172 p_sys->i_bitrate_avg = 0;
173 p_sys->b_big_endian = false;
175 if( stream_Seek( p_demux->s, p_sys->i_stream_offset ) )
181 if( p_sys->codec.pf_init( p_demux ) )
187 msg_Dbg( p_demux, "detected format %4.4s", (const char*)&p_sys->codec.i_codec );
189 /* Load the audio packetizer */
190 es_format_Init( &fmt, AUDIO_ES, p_sys->codec.i_codec );
191 p_sys->p_packetizer = demux_PacketizerNew( p_demux, &fmt, p_sys->codec.psz_name );
192 if( !p_sys->p_packetizer )
200 /*****************************************************************************
201 * Demux: reads and demuxes data packets
202 *****************************************************************************
203 * Returns -1 in case of error, 0 in case of EOF, 1 otherwise
204 *****************************************************************************/
205 static int Demux( demux_t *p_demux )
207 demux_sys_t *p_sys = p_demux->p_sys;
208 block_t *p_block_in, *p_block_out;
210 if( p_sys->codec.b_use_word )
212 /* Make sure we are word aligned */
213 int64_t i_pos = stream_Tell( p_demux->s );
215 stream_Read( p_demux->s, NULL, 1 );
218 if( ( p_block_in = stream_Block( p_demux->s, p_sys->i_packet_size ) ) == NULL )
221 if( p_sys->codec.b_use_word && !p_sys->b_big_endian && p_block_in->i_buffer > 0 )
223 /* Convert to big endian */
225 swab( p_block_in->p_buffer, p_block_in->p_buffer, p_block_in->i_buffer );
227 uint8_t *p_tmp = p_block_in->p_buffer;
228 for( int i = p_block_in->i_buffer / 2 ; i-- ; )
230 uint8_t tmp = p_tmp[0];
238 p_block_in->i_pts = p_block_in->i_dts = p_sys->b_start || p_sys->b_initial_sync_failed ? 1 : 0;
239 p_sys->b_initial_sync_failed = p_sys->b_start; /* Only try to resync once */
241 while( ( p_block_out = p_sys->p_packetizer->pf_packetize( p_sys->p_packetizer, &p_block_in ) ) )
243 p_sys->b_initial_sync_failed = false;
246 block_t *p_next = p_block_out->p_next;
250 p_sys->p_packetizer->fmt_out.b_packetized = true;
251 p_sys->p_es = es_out_Add( p_demux->out,
252 &p_sys->p_packetizer->fmt_out);
255 /* Try the xing header */
256 if( p_sys->xing.i_bytes && p_sys->xing.i_frames &&
257 p_sys->xing.i_frame_samples )
259 p_sys->i_bitrate_avg = p_sys->xing.i_bytes * INT64_C(8) *
260 p_sys->p_packetizer->fmt_out.audio.i_rate /
261 p_sys->xing.i_frames / p_sys->xing.i_frame_samples;
263 if( p_sys->i_bitrate_avg > 0 )
264 p_sys->b_estimate_bitrate = false;
266 /* Use the bitrate as initual value */
267 if( p_sys->b_estimate_bitrate )
268 p_sys->i_bitrate_avg = p_sys->p_packetizer->fmt_out.i_bitrate;
271 p_sys->i_pts = p_block_out->i_pts;
273 /* Re-estimate bitrate */
274 if( p_sys->b_estimate_bitrate && p_sys->i_pts > 1 + INT64_C(500000) )
275 p_sys->i_bitrate_avg = 8*INT64_C(1000000)*p_sys->i_bytes/(p_sys->i_pts-1);
276 p_sys->i_bytes += p_block_out->i_buffer;
278 /* Correct timestamp */
279 p_block_out->i_pts += p_sys->i_time_offset;
280 p_block_out->i_dts += p_sys->i_time_offset;
282 es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_block_out->i_dts );
284 es_out_Send( p_demux->out, p_sys->p_es, p_block_out );
286 p_block_out = p_next;
290 if( p_sys->b_initial_sync_failed )
291 msg_Dbg( p_demux, "did not sync on first block" );
292 p_sys->b_start = false;
296 /*****************************************************************************
297 * Close: frees unused data
298 *****************************************************************************/
299 static void Close( vlc_object_t * p_this )
301 demux_t *p_demux = (demux_t*)p_this;
302 demux_sys_t *p_sys = p_demux->p_sys;
304 demux_PacketizerDestroy( p_sys->p_packetizer );
308 /*****************************************************************************
310 *****************************************************************************/
311 static int Control( demux_t *p_demux, int i_query, va_list args )
313 demux_sys_t *p_sys = p_demux->p_sys;
319 va_copy ( args_save, args );
323 case DEMUX_HAS_UNSUPPORTED_META:
324 pb_bool = (bool*)va_arg( args, bool* );
329 pi64 = (int64_t*)va_arg( args, int64_t * );
330 *pi64 = p_sys->i_pts + p_sys->i_time_offset;
333 case DEMUX_GET_LENGTH:
334 i_ret = demux_vaControlHelper( p_demux->s, p_sys->i_stream_offset, -1,
335 p_sys->i_bitrate_avg, 1, i_query,
337 /* No bitrate, we can't have it precisely, but we can compute
338 * a raw approximation with time/position */
339 if( i_ret && !p_sys->i_bitrate_avg )
341 float f_pos = (double)(uint64_t)( stream_Tell( p_demux->s ) ) /
342 (double)(uint64_t)( stream_Size( p_demux->s ) );
343 /* The first few seconds are guaranteed to be very whacky,
344 * don't bother trying ... Too bad */
346 (p_sys->i_pts + p_sys->i_time_offset) < 8000000 )
349 pi64 = (int64_t *)va_arg( args_save, int64_t * );
350 *pi64 = (p_sys->i_pts + p_sys->i_time_offset) / f_pos;
357 /* FIXME TODO: implement a high precision seek (with mp3 parsing)
358 * needed for multi-input */
360 i_ret = demux_vaControlHelper( p_demux->s, p_sys->i_stream_offset, -1,
361 p_sys->i_bitrate_avg, 1, i_query,
363 if( !i_ret && p_sys->i_bitrate_avg > 0 &&
364 (i_query == DEMUX_SET_POSITION || i_query == DEMUX_SET_TIME) )
366 int64_t i_time = INT64_C(8000000) * ( stream_Tell(p_demux->s) - p_sys->i_stream_offset ) /
367 p_sys->i_bitrate_avg;
369 /* Fix time_offset */
371 p_sys->i_time_offset = i_time - p_sys->i_pts;
377 /*****************************************************************************
379 *****************************************************************************/
380 static int MpgaCheckSync( const uint8_t *p_peek )
382 uint32_t h = GetDWBE( p_peek );
384 if( ((( h >> 21 )&0x07FF) != 0x07FF ) /* header sync */
385 || (((h >> 17)&0x03) == 0 ) /* valid layer ?*/
386 || (((h >> 12)&0x0F) == 0x0F )
387 || (((h >> 12)&0x0F) == 0x00 ) /* valid bitrate ? */
388 || (((h >> 10) & 0x03) == 0x03 ) /* valide sampling freq ? */
389 || ((h & 0x03) == 0x02 )) /* valid emphasis ? */
396 #define MPGA_VERSION( h ) ( 1 - (((h)>>19)&0x01) )
397 #define MPGA_MODE(h) (((h)>> 6)&0x03)
399 static int MpgaGetFrameSamples( uint32_t h )
401 const int i_layer = 3 - (((h)>>17)&0x03);
409 return MPGA_VERSION(h) ? 576 : 1152;
415 static int MpgaProbe( demux_t *p_demux, int64_t *pi_offset )
421 const uint8_t *p_peek;
423 b_forced = demux_IsPathExtension( p_demux, ".mp3" );
424 b_forced_demux = demux_IsForced( p_demux, "mp3" ) ||
425 demux_IsForced( p_demux, "mpga" );
427 i_offset = stream_Tell( p_demux->s );
428 if( stream_Peek( p_demux->s, &p_peek, 4 ) < 4 )
431 if( !MpgaCheckSync( p_peek ) )
436 if( !b_forced_demux && !b_forced )
439 i_peek = stream_Peek( p_demux->s, &p_peek, 8096 );
442 if( MpgaCheckSync( p_peek ) )
451 if( !b_ok && !b_forced_demux )
454 *pi_offset = i_offset;
458 static void MpgaXingSkip( const uint8_t **pp_xing, int *pi_xing, int i_count )
460 if(i_count > *pi_xing )
463 (*pp_xing) += i_count;
464 (*pi_xing) -= i_count;
467 static uint32_t MpgaXingGetDWBE( const uint8_t **pp_xing, int *pi_xing, uint32_t i_default )
472 uint32_t v = GetDWBE( *pp_xing );
474 MpgaXingSkip( pp_xing, pi_xing, 4 );
479 static int MpgaInit( demux_t *p_demux )
481 demux_sys_t *p_sys = p_demux->p_sys;
483 const uint8_t *p_peek;
487 p_sys->i_packet_size = 1024;
489 /* Load a potential xing header */
490 i_peek = stream_Peek( p_demux->s, &p_peek, 4 + 1024 );
491 if( i_peek < 4 + 21 )
494 const uint32_t header = GetDWBE( p_peek );
495 if( !MpgaCheckSync( p_peek ) )
499 const uint8_t *p_xing = p_peek;
503 if( MPGA_VERSION( header ) == 0 )
504 i_skip = MPGA_MODE( header ) != 3 ? 36 : 21;
506 i_skip = MPGA_MODE( header ) != 3 ? 21 : 13;
508 if( i_skip + 8 >= i_xing || memcmp( &p_xing[i_skip], "Xing", 4 ) )
511 const uint32_t i_flags = GetDWBE( &p_xing[i_skip+4] );
513 MpgaXingSkip( &p_xing, &i_xing, i_skip + 8 );
516 p_sys->xing.i_frames = MpgaXingGetDWBE( &p_xing, &i_xing, 0 );
518 p_sys->xing.i_bytes = MpgaXingGetDWBE( &p_xing, &i_xing, 0 );
519 if( i_flags&0x04 ) /* TODO Support XING TOC to improve seeking accuracy */
520 MpgaXingSkip( &p_xing, &i_xing, 100 );
523 /* FIXME: doesn't return the right bitrage average, at least
525 p_sys->xing.i_bitrate_avg = MpgaXingGetDWBE( &p_xing, &i_xing, 0 );
526 msg_Dbg( p_demux, "xing vbr value present (%d)",
527 p_sys->xing.i_bitrate_avg );
530 if( p_sys->xing.i_frames > 0 && p_sys->xing.i_bytes > 0 )
532 p_sys->xing.i_frame_samples = MpgaGetFrameSamples( header );
533 msg_Dbg( p_demux, "xing frames&bytes value present "
534 "(%d bytes, %d frames, %d samples/frame)",
535 p_sys->xing.i_bytes, p_sys->xing.i_frames,
536 p_sys->xing.i_frame_samples );
541 /*****************************************************************************
543 *****************************************************************************/
544 static int AacProbe( demux_t *p_demux, int64_t *pi_offset )
550 const uint8_t *p_peek;
552 b_forced = demux_IsPathExtension( p_demux, ".aac" ) ||
553 demux_IsPathExtension( p_demux, ".aacp" );
554 b_forced_demux = demux_IsForced( p_demux, "m4a" ) ||
555 demux_IsForced( p_demux, "aac" ) ||
556 demux_IsForced( p_demux, "mp4a" );
558 if( !b_forced_demux && !b_forced )
561 i_offset = stream_Tell( p_demux->s );
563 /* peek the begining (10 is for adts header) */
564 if( stream_Peek( p_demux->s, &p_peek, 10 ) < 10 )
566 msg_Err( p_demux, "cannot peek" );
569 if( !strncmp( (char *)p_peek, "ADIF", 4 ) )
571 msg_Err( p_demux, "ADIF file. Not yet supported. (Please report)" );
575 *pi_offset = i_offset;
578 static int AacInit( demux_t *p_demux )
580 demux_sys_t *p_sys = p_demux->p_sys;
582 p_sys->i_packet_size = 4096;
587 /*****************************************************************************
589 *****************************************************************************/
590 #define WAV_PROBE_SIZE (512*1024)
591 static int WavSkipHeader( demux_t *p_demux, int *pi_skip )
593 const uint8_t *p_peek;
599 /* Check if we are dealing with a WAV file */
600 if( stream_Peek( p_demux->s, &p_peek, 12+8 ) != 12 + 8 )
603 if( memcmp( p_peek, "RIFF", 4 ) || memcmp( &p_peek[8], "WAVE", 4 ) )
606 /* Find the wave format header */
608 while( memcmp( p_peek + i_peek - 8, "fmt ", 4 ) )
610 uint32_t i_len = GetDWLE( p_peek + i_peek - 4 );
611 if( i_len > WAV_PROBE_SIZE || i_peek + i_len > WAV_PROBE_SIZE )
615 if( stream_Peek( p_demux->s, &p_peek, i_peek ) != i_peek )
619 /* Sanity check the wave format header */
620 uint32_t i_len = GetDWLE( p_peek + i_peek - 4 );
621 if( i_len > WAV_PROBE_SIZE )
625 if( stream_Peek( p_demux->s, &p_peek, i_peek ) != i_peek )
627 if( GetWLE( p_peek + i_peek - i_len - 8 /* wFormatTag */ ) !=
628 1 /* WAVE_FORMAT_PCM */ )
630 if( GetWLE( p_peek + i_peek - i_len - 6 /* nChannels */ ) != 2 )
632 if( GetDWLE( p_peek + i_peek - i_len - 4 /* nSamplesPerSec */ ) !=
636 /* Skip the wave header */
637 while( memcmp( p_peek + i_peek - 8, "data", 4 ) )
639 uint32_t i_len = GetDWLE( p_peek + i_peek - 4 );
640 if( i_len > WAV_PROBE_SIZE || i_peek + i_len > WAV_PROBE_SIZE )
644 if( stream_Peek( p_demux->s, &p_peek, i_peek ) != i_peek )
651 static int GenericProbe( demux_t *p_demux, int64_t *pi_offset,
652 const char * ppsz_name[],
653 bool (*pf_check)( const uint8_t * ), int i_check_size )
658 const uint8_t *p_peek;
661 b_forced_demux = false;
662 for( int i = 0; ppsz_name[i] != NULL; i++ )
664 b_forced_demux |= demux_IsForced( p_demux, ppsz_name[i] );
667 i_offset = stream_Tell( p_demux->s );
669 if( WavSkipHeader( p_demux, &i_skip ) )
671 if( !b_forced_demux )
674 const bool b_wav = i_skip > 0;
677 * It is common that wav files have some sort of garbage at the begining */
678 const int i_probe = i_skip + i_check_size + ( b_wav ? 16000 : 0);
679 const int i_peek = stream_Peek( p_demux->s, &p_peek, i_probe );
680 if( i_peek < i_skip + i_check_size )
682 msg_Err( p_demux, "cannot peek" );
687 if( i_skip + i_check_size > i_peek )
689 if( !b_forced_demux )
693 if( pf_check( &p_peek[i_skip] ) )
698 *pi_offset = i_offset + i_skip;
702 /*****************************************************************************
704 *****************************************************************************/
705 static bool A52CheckSync( const uint8_t *p_peek, bool *p_big_endian, bool b_eac3 )
707 /* bsid: 0-8 11-16 */
709 /* Little endian version of the bitstream */
710 if( p_peek[0] == 0x77 && p_peek[1] == 0x0b &&
711 ( p_peek[4] >> 3 ) <= ( b_eac3 ? 16 : 10 ) /* bsid */ )
713 *p_big_endian = false;
716 /* Big endian version of the bitstream */
717 else if( p_peek[0] == 0x0b && p_peek[1] == 0x77 &&
718 ( p_peek[5] >> 3 ) <= ( b_eac3 ? 16 : 10 ) /* bsid */ )
720 *p_big_endian = true;
726 static bool EA52CheckSyncProbe( const uint8_t *p_peek )
729 return A52CheckSync( p_peek, &b_dummy, true );
732 static int EA52Probe( demux_t *p_demux, int64_t *pi_offset )
734 const char *ppsz_name[] = { "eac3", NULL };
736 return GenericProbe( p_demux, pi_offset, ppsz_name, EA52CheckSyncProbe, 10 );
739 static bool A52CheckSyncProbe( const uint8_t *p_peek )
742 return A52CheckSync( p_peek, &b_dummy, false );
745 static int A52Probe( demux_t *p_demux, int64_t *pi_offset )
747 const char *ppsz_name[] = { "a52", "ac3", NULL };
749 return GenericProbe( p_demux, pi_offset, ppsz_name, A52CheckSyncProbe, 10 );
752 static int A52Init( demux_t *p_demux )
754 demux_sys_t *p_sys = p_demux->p_sys;
756 p_sys->b_big_endian = false;
757 p_sys->i_packet_size = 1024;
759 const uint8_t *p_peek;
761 /* peek the begining (10 is for a52 header) */
762 if( stream_Peek( p_demux->s, &p_peek, 10 ) >= 10 )
764 A52CheckSync( p_peek, &p_sys->b_big_endian, true );
769 /*****************************************************************************
771 *****************************************************************************/
772 static bool DtsCheckSync( const uint8_t *p_peek )
774 /* 14 bits, little endian version of the bitstream */
775 if( p_peek[0] == 0xff && p_peek[1] == 0x1f &&
776 p_peek[2] == 0x00 && p_peek[3] == 0xe8 &&
777 (p_peek[4] & 0xf0) == 0xf0 && p_peek[5] == 0x07 )
781 /* 14 bits, big endian version of the bitstream */
782 else if( p_peek[0] == 0x1f && p_peek[1] == 0xff &&
783 p_peek[2] == 0xe8 && p_peek[3] == 0x00 &&
784 p_peek[4] == 0x07 && (p_peek[5] & 0xf0) == 0xf0)
788 /* 16 bits, big endian version of the bitstream */
789 else if( p_peek[0] == 0x7f && p_peek[1] == 0xfe &&
790 p_peek[2] == 0x80 && p_peek[3] == 0x01 )
794 /* 16 bits, little endian version of the bitstream */
795 else if( p_peek[0] == 0xfe && p_peek[1] == 0x7f &&
796 p_peek[2] == 0x01 && p_peek[3] == 0x80 )
804 static int DtsProbe( demux_t *p_demux, int64_t *pi_offset )
806 const char *ppsz_name[] = { "dts", NULL };
808 return GenericProbe( p_demux, pi_offset, ppsz_name, DtsCheckSync, 11 );
810 static int DtsInit( demux_t *p_demux )
812 demux_sys_t *p_sys = p_demux->p_sys;
814 p_sys->i_packet_size = 16384;
819 /*****************************************************************************
821 *****************************************************************************/
822 static bool MlpCheckSync( const uint8_t *p_peek )
824 if( p_peek[4+0] != 0xf8 || p_peek[4+1] != 0x72 || p_peek[4+2] != 0x6f )
827 if( p_peek[4+3] != 0xba && p_peek[4+3] != 0xbb )
834 static int MlpProbe( demux_t *p_demux, int64_t *pi_offset )
836 const char *ppsz_name[] = { "mlp", NULL };
838 return GenericProbe( p_demux, pi_offset, ppsz_name, MlpCheckSync, 4+28+16*4 );
840 static int MlpInit( demux_t *p_demux )
843 demux_sys_t *p_sys = p_demux->p_sys;
845 p_sys->i_packet_size = 4096;