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 #include "../../codec/a52.h"
41 /*****************************************************************************
43 *****************************************************************************/
44 static int Open ( vlc_object_t * );
45 static void Close( vlc_object_t * );
48 set_category( CAT_INPUT )
49 set_subcategory( SUBCAT_INPUT_DEMUX )
50 set_description( N_("MPEG-I/II/4 / A52 / DTS / MLP audio" ) )
51 set_capability( "demux", 155 )
52 set_callbacks( Open, Close )
54 add_shortcut( "mpga" )
58 add_shortcut( "mp4a" )
64 add_shortcut( "eac3" )
71 /*****************************************************************************
73 *****************************************************************************/
74 static int Demux ( demux_t * );
75 static int Control( demux_t *, int, va_list );
82 int (*pf_probe)( demux_t *p_demux, int64_t *pi_offset );
83 int (*pf_init)( demux_t *p_demux );
93 decoder_t *p_packetizer;
96 mtime_t i_time_offset;
100 bool b_estimate_bitrate;
101 int i_bitrate_avg; /* extracted from Xing header */
103 bool b_initial_sync_failed;
107 int64_t i_stream_offset;
119 static int MpgaProbe( demux_t *p_demux, int64_t *pi_offset );
120 static int MpgaInit( demux_t *p_demux );
122 static int AacProbe( demux_t *p_demux, int64_t *pi_offset );
123 static int AacInit( demux_t *p_demux );
125 static int EA52Probe( demux_t *p_demux, int64_t *pi_offset );
126 static int A52Probe( demux_t *p_demux, int64_t *pi_offset );
127 static int A52Init( demux_t *p_demux );
129 static int DtsProbe( demux_t *p_demux, int64_t *pi_offset );
130 static int DtsInit( demux_t *p_demux );
132 static int MlpProbe( demux_t *p_demux, int64_t *pi_offset );
133 static int MlpInit( demux_t *p_demux );
135 static const codec_t p_codec[] = {
136 { VLC_FOURCC( 'm', 'p', '4', 'a' ), false, "mp4 audio", AacProbe, AacInit },
137 { VLC_FOURCC( 'm', 'p', 'g', 'a' ), false, "mpeg audio", MpgaProbe, MpgaInit },
138 { VLC_FOURCC( 'a', '5', '2', ' ' ), true, "a52 audio", A52Probe, A52Init },
139 { VLC_FOURCC( 'e', 'a', 'c', '3' ), true, "eac3 audio", EA52Probe, A52Init },
140 { VLC_FOURCC( 'd', 't', 's', ' ' ), false, "dts audio", DtsProbe, DtsInit },
141 { VLC_FOURCC( 'm', 'l', 'p', ' ' ), false, "mlp audio", MlpProbe, MlpInit },
143 { 0, false, NULL, NULL, NULL }
146 /*****************************************************************************
147 * Open: initializes demux structures
148 *****************************************************************************/
149 static int Open( vlc_object_t * p_this )
151 demux_t *p_demux = (demux_t*)p_this;
158 for( i_index = 0; p_codec[i_index].i_codec != 0; i_index++ )
160 if( !p_codec[i_index].pf_probe( p_demux, &i_offset ) )
164 if( p_codec[i_index].i_codec == 0 )
167 DEMUX_INIT_COMMON(); p_sys = p_demux->p_sys;
168 memset( p_sys, 0, sizeof( demux_sys_t ) );
169 p_sys->codec = p_codec[i_index];
171 p_sys->b_start = true;
172 p_sys->i_stream_offset = i_offset;
173 p_sys->b_estimate_bitrate = true;
174 p_sys->i_bitrate_avg = 0;
175 p_sys->b_big_endian = false;
177 if( stream_Seek( p_demux->s, p_sys->i_stream_offset ) )
183 if( p_sys->codec.pf_init( p_demux ) )
189 msg_Dbg( p_demux, "detected format %4.4s", (const char*)&p_sys->codec.i_codec );
191 /* Load the audio packetizer */
192 es_format_Init( &fmt, AUDIO_ES, p_sys->codec.i_codec );
193 p_sys->p_packetizer = demux_PacketizerNew( p_demux, &fmt, p_sys->codec.psz_name );
194 if( !p_sys->p_packetizer )
202 /*****************************************************************************
203 * Demux: reads and demuxes data packets
204 *****************************************************************************
205 * Returns -1 in case of error, 0 in case of EOF, 1 otherwise
206 *****************************************************************************/
207 static int Demux( demux_t *p_demux )
209 demux_sys_t *p_sys = p_demux->p_sys;
210 block_t *p_block_in, *p_block_out;
212 if( p_sys->codec.b_use_word )
214 /* Make sure we are word aligned */
215 int64_t i_pos = stream_Tell( p_demux->s );
217 stream_Read( p_demux->s, NULL, 1 );
220 if( ( p_block_in = stream_Block( p_demux->s, p_sys->i_packet_size ) ) == NULL )
223 if( p_sys->codec.b_use_word && !p_sys->b_big_endian && p_block_in->i_buffer > 0 )
225 /* Convert to big endian */
226 swab( p_block_in->p_buffer, p_block_in->p_buffer, p_block_in->i_buffer );
229 p_block_in->i_pts = p_block_in->i_dts = p_sys->b_start || p_sys->b_initial_sync_failed ? 1 : 0;
230 p_sys->b_initial_sync_failed = p_sys->b_start; /* Only try to resync once */
232 while( ( p_block_out = p_sys->p_packetizer->pf_packetize( p_sys->p_packetizer, &p_block_in ) ) )
234 p_sys->b_initial_sync_failed = false;
237 block_t *p_next = p_block_out->p_next;
241 p_sys->p_packetizer->fmt_out.b_packetized = true;
242 p_sys->p_es = es_out_Add( p_demux->out,
243 &p_sys->p_packetizer->fmt_out);
246 /* Try the xing header */
247 if( p_sys->xing.i_bytes && p_sys->xing.i_frames &&
248 p_sys->xing.i_frame_samples )
250 p_sys->i_bitrate_avg = p_sys->xing.i_bytes * INT64_C(8) *
251 p_sys->p_packetizer->fmt_out.audio.i_rate /
252 p_sys->xing.i_frames / p_sys->xing.i_frame_samples;
254 if( p_sys->i_bitrate_avg > 0 )
255 p_sys->b_estimate_bitrate = false;
257 /* Use the bitrate as initual value */
258 if( p_sys->b_estimate_bitrate )
259 p_sys->i_bitrate_avg = p_sys->p_packetizer->fmt_out.i_bitrate;
262 p_sys->i_pts = p_block_out->i_pts;
264 /* Re-estimate bitrate */
265 if( p_sys->b_estimate_bitrate && p_sys->i_pts > 1 + INT64_C(500000) )
266 p_sys->i_bitrate_avg = 8*INT64_C(1000000)*p_sys->i_bytes/(p_sys->i_pts-1);
267 p_sys->i_bytes += p_block_out->i_buffer;
269 /* Correct timestamp */
270 p_block_out->i_pts += p_sys->i_time_offset;
271 p_block_out->i_dts += p_sys->i_time_offset;
273 es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_block_out->i_dts );
275 es_out_Send( p_demux->out, p_sys->p_es, p_block_out );
277 p_block_out = p_next;
281 if( p_sys->b_initial_sync_failed )
282 msg_Dbg( p_demux, "did not sync on first block" );
283 p_sys->b_start = false;
287 /*****************************************************************************
288 * Close: frees unused data
289 *****************************************************************************/
290 static void Close( vlc_object_t * p_this )
292 demux_t *p_demux = (demux_t*)p_this;
293 demux_sys_t *p_sys = p_demux->p_sys;
295 demux_PacketizerDestroy( p_sys->p_packetizer );
299 /*****************************************************************************
301 *****************************************************************************/
302 static int Control( demux_t *p_demux, int i_query, va_list args )
304 demux_sys_t *p_sys = p_demux->p_sys;
310 va_copy ( args_save, args );
314 case DEMUX_HAS_UNSUPPORTED_META:
315 pb_bool = (bool*)va_arg( args, bool* );
320 pi64 = (int64_t*)va_arg( args, int64_t * );
321 *pi64 = p_sys->i_pts + p_sys->i_time_offset;
324 case DEMUX_GET_LENGTH:
325 i_ret = demux_vaControlHelper( p_demux->s, p_sys->i_stream_offset, -1,
326 p_sys->i_bitrate_avg, 1, i_query,
328 /* No bitrate, we can't have it precisely, but we can compute
329 * a raw approximation with time/position */
330 if( i_ret && !p_sys->i_bitrate_avg )
332 float f_pos = (double)(uint64_t)( stream_Tell( p_demux->s ) ) /
333 (double)(uint64_t)( stream_Size( p_demux->s ) );
334 /* The first few seconds are guaranteed to be very whacky,
335 * don't bother trying ... Too bad */
337 (p_sys->i_pts + p_sys->i_time_offset) < 8000000 )
340 pi64 = (int64_t *)va_arg( args_save, int64_t * );
341 *pi64 = (p_sys->i_pts + p_sys->i_time_offset) / f_pos;
348 /* FIXME TODO: implement a high precision seek (with mp3 parsing)
349 * needed for multi-input */
351 i_ret = demux_vaControlHelper( p_demux->s, p_sys->i_stream_offset, -1,
352 p_sys->i_bitrate_avg, 1, i_query,
354 if( !i_ret && p_sys->i_bitrate_avg > 0 &&
355 (i_query == DEMUX_SET_POSITION || i_query == DEMUX_SET_TIME) )
357 int64_t i_time = INT64_C(8000000) * ( stream_Tell(p_demux->s) - p_sys->i_stream_offset ) /
358 p_sys->i_bitrate_avg;
360 /* Fix time_offset */
362 p_sys->i_time_offset = i_time - p_sys->i_pts;
368 /*****************************************************************************
370 *****************************************************************************/
371 static int MpgaCheckSync( const uint8_t *p_peek )
373 uint32_t h = GetDWBE( p_peek );
375 if( ((( h >> 21 )&0x07FF) != 0x07FF ) /* header sync */
376 || (((h >> 17)&0x03) == 0 ) /* valid layer ?*/
377 || (((h >> 12)&0x0F) == 0x0F )
378 || (((h >> 12)&0x0F) == 0x00 ) /* valid bitrate ? */
379 || (((h >> 10) & 0x03) == 0x03 ) /* valide sampling freq ? */
380 || ((h & 0x03) == 0x02 )) /* valid emphasis ? */
387 #define MPGA_VERSION( h ) ( 1 - (((h)>>19)&0x01) )
388 #define MPGA_MODE(h) (((h)>> 6)&0x03)
390 static int MpgaGetFrameSamples( uint32_t h )
392 const int i_layer = 3 - (((h)>>17)&0x03);
400 return MPGA_VERSION(h) ? 576 : 1152;
406 static int MpgaProbe( demux_t *p_demux, int64_t *pi_offset )
412 const uint8_t *p_peek;
414 b_forced = demux_IsPathExtension( p_demux, ".mp3" );
415 b_forced_demux = demux_IsForced( p_demux, "mp3" ) ||
416 demux_IsForced( p_demux, "mpga" );
418 i_offset = stream_Tell( p_demux->s );
419 if( stream_Peek( p_demux->s, &p_peek, 4 ) < 4 )
422 if( !MpgaCheckSync( p_peek ) )
427 if( !b_forced_demux && !b_forced )
430 i_peek = stream_Peek( p_demux->s, &p_peek, 8096 );
433 if( MpgaCheckSync( p_peek ) )
442 if( !b_ok && !b_forced_demux )
445 *pi_offset = i_offset;
449 static void MpgaXingSkip( const uint8_t **pp_xing, int *pi_xing, int i_count )
451 if(i_count > *pi_xing )
454 (*pp_xing) += i_count;
455 (*pi_xing) -= i_count;
458 static uint32_t MpgaXingGetDWBE( const uint8_t **pp_xing, int *pi_xing, uint32_t i_default )
463 uint32_t v = GetDWBE( *pp_xing );
465 MpgaXingSkip( pp_xing, pi_xing, 4 );
470 static int MpgaInit( demux_t *p_demux )
472 demux_sys_t *p_sys = p_demux->p_sys;
474 const uint8_t *p_peek;
478 p_sys->i_packet_size = 1024;
480 /* Load a potential xing header */
481 i_peek = stream_Peek( p_demux->s, &p_peek, 4 + 1024 );
482 if( i_peek < 4 + 21 )
485 const uint32_t header = GetDWBE( p_peek );
486 if( !MpgaCheckSync( p_peek ) )
490 const uint8_t *p_xing = p_peek;
494 if( MPGA_VERSION( header ) == 0 )
495 i_skip = MPGA_MODE( header ) != 3 ? 36 : 21;
497 i_skip = MPGA_MODE( header ) != 3 ? 21 : 13;
499 if( i_skip + 8 >= i_xing || memcmp( &p_xing[i_skip], "Xing", 4 ) )
502 const uint32_t i_flags = GetDWBE( &p_xing[i_skip+4] );
504 MpgaXingSkip( &p_xing, &i_xing, i_skip + 8 );
507 p_sys->xing.i_frames = MpgaXingGetDWBE( &p_xing, &i_xing, 0 );
509 p_sys->xing.i_bytes = MpgaXingGetDWBE( &p_xing, &i_xing, 0 );
510 if( i_flags&0x04 ) /* TODO Support XING TOC to improve seeking accuracy */
511 MpgaXingSkip( &p_xing, &i_xing, 100 );
514 /* FIXME: doesn't return the right bitrage average, at least
516 p_sys->xing.i_bitrate_avg = MpgaXingGetDWBE( &p_xing, &i_xing, 0 );
517 msg_Dbg( p_demux, "xing vbr value present (%d)",
518 p_sys->xing.i_bitrate_avg );
521 if( p_sys->xing.i_frames > 0 && p_sys->xing.i_bytes > 0 )
523 p_sys->xing.i_frame_samples = MpgaGetFrameSamples( header );
524 msg_Dbg( p_demux, "xing frames&bytes value present "
525 "(%d bytes, %d frames, %d samples/frame)",
526 p_sys->xing.i_bytes, p_sys->xing.i_frames,
527 p_sys->xing.i_frame_samples );
532 /*****************************************************************************
534 *****************************************************************************/
535 static int AacProbe( demux_t *p_demux, int64_t *pi_offset )
541 const uint8_t *p_peek;
543 b_forced = demux_IsPathExtension( p_demux, ".aac" ) ||
544 demux_IsPathExtension( p_demux, ".aacp" );
545 b_forced_demux = demux_IsForced( p_demux, "m4a" ) ||
546 demux_IsForced( p_demux, "aac" ) ||
547 demux_IsForced( p_demux, "mp4a" );
549 if( !b_forced_demux && !b_forced )
552 i_offset = stream_Tell( p_demux->s );
554 /* peek the begining (10 is for adts header) */
555 if( stream_Peek( p_demux->s, &p_peek, 10 ) < 10 )
557 msg_Err( p_demux, "cannot peek" );
560 if( !strncmp( (char *)p_peek, "ADIF", 4 ) )
562 msg_Err( p_demux, "ADIF file. Not yet supported. (Please report)" );
566 *pi_offset = i_offset;
569 static int AacInit( demux_t *p_demux )
571 demux_sys_t *p_sys = p_demux->p_sys;
573 p_sys->i_packet_size = 4096;
578 /*****************************************************************************
580 *****************************************************************************/
581 #define WAV_PROBE_SIZE (512*1024)
582 static int WavSkipHeader( demux_t *p_demux, int *pi_skip )
584 const uint8_t *p_peek;
590 /* Check if we are dealing with a WAV file */
591 if( stream_Peek( p_demux->s, &p_peek, 12+8 ) != 12 + 8 )
594 if( memcmp( p_peek, "RIFF", 4 ) || memcmp( &p_peek[8], "WAVE", 4 ) )
597 /* Find the wave format header */
599 while( memcmp( p_peek + i_peek - 8, "fmt ", 4 ) )
601 uint32_t i_len = GetDWLE( p_peek + i_peek - 4 );
602 if( i_len > WAV_PROBE_SIZE || i_peek + i_len > WAV_PROBE_SIZE )
606 if( stream_Peek( p_demux->s, &p_peek, i_peek ) != i_peek )
610 /* Sanity check the wave format header */
611 uint32_t i_len = GetDWLE( p_peek + i_peek - 4 );
612 if( i_len > WAV_PROBE_SIZE )
616 if( stream_Peek( p_demux->s, &p_peek, i_peek ) != i_peek )
618 if( GetWLE( p_peek + i_peek - i_len - 8 /* wFormatTag */ ) !=
619 1 /* WAVE_FORMAT_PCM */ )
621 if( GetWLE( p_peek + i_peek - i_len - 6 /* nChannels */ ) != 2 )
623 if( GetDWLE( p_peek + i_peek - i_len - 4 /* nSamplesPerSec */ ) !=
627 /* Skip the wave header */
628 while( memcmp( p_peek + i_peek - 8, "data", 4 ) )
630 uint32_t i_len = GetDWLE( p_peek + i_peek - 4 );
631 if( i_len > WAV_PROBE_SIZE || i_peek + i_len > WAV_PROBE_SIZE )
635 if( stream_Peek( p_demux->s, &p_peek, i_peek ) != i_peek )
642 static int GenericProbe( demux_t *p_demux, int64_t *pi_offset,
643 const char * ppsz_name[],
644 int (*pf_check)( const uint8_t * ), int i_check_size )
649 const uint8_t *p_peek;
652 b_forced_demux = false;
653 for( int i = 0; ppsz_name[i] != NULL; i++ )
655 b_forced_demux |= demux_IsForced( p_demux, ppsz_name[i] );
658 i_offset = stream_Tell( p_demux->s );
660 if( WavSkipHeader( p_demux, &i_skip ) )
662 if( !b_forced_demux )
665 const bool b_wav = i_skip > 0;
668 * It is common that wav files have some sort of garbage at the begining */
669 const int i_probe = i_skip + i_check_size + ( b_wav ? 16000 : 0);
670 const int i_peek = stream_Peek( p_demux->s, &p_peek, i_probe );
671 if( i_peek < i_skip + i_check_size )
673 msg_Err( p_demux, "cannot peek" );
678 if( i_skip + i_check_size > i_peek )
680 if( !b_forced_demux )
684 const int i_size = pf_check( &p_peek[i_skip] );
687 if( i_size == 0 || 1)
690 /* If we have the frame size, check the next frame for
691 * extra robustness */
692 if( i_skip + i_check_size + i_size <= i_peek )
694 if( pf_check( &p_peek[i_skip+i_size] ) >= 0 )
701 *pi_offset = i_offset + i_skip;
705 /*****************************************************************************
707 *****************************************************************************/
708 static int A52CheckSync( const uint8_t *p_peek, bool *p_big_endian, bool b_eac3 )
710 vlc_a52_header_t header;
711 uint8_t p_tmp[VLC_A52_HEADER_SIZE];
713 *p_big_endian = p_peek[0] == 0x0b && p_peek[1] == 0x77;
716 swab( p_peek, p_tmp, VLC_A52_HEADER_SIZE );
720 if( vlc_a52_header_Parse( &header, p_peek, VLC_A52_HEADER_SIZE ) )
723 if( !header.b_eac3 != !b_eac3 )
725 return header.i_size;
727 static int EA52CheckSyncProbe( const uint8_t *p_peek )
730 return A52CheckSync( p_peek, &b_dummy, true );
733 static int EA52Probe( demux_t *p_demux, int64_t *pi_offset )
735 const char *ppsz_name[] = { "eac3", NULL };
737 return GenericProbe( p_demux, pi_offset, ppsz_name, EA52CheckSyncProbe, VLC_A52_HEADER_SIZE );
740 static int A52CheckSyncProbe( const uint8_t *p_peek )
743 return A52CheckSync( p_peek, &b_dummy, false );
746 static int A52Probe( demux_t *p_demux, int64_t *pi_offset )
748 const char *ppsz_name[] = { "a52", "ac3", NULL };
750 return GenericProbe( p_demux, pi_offset, ppsz_name, A52CheckSyncProbe, VLC_A52_HEADER_SIZE );
753 static int A52Init( demux_t *p_demux )
755 demux_sys_t *p_sys = p_demux->p_sys;
757 p_sys->b_big_endian = false;
758 p_sys->i_packet_size = 1024;
760 const uint8_t *p_peek;
762 /* peek the begining */
763 if( stream_Peek( p_demux->s, &p_peek, VLC_A52_HEADER_SIZE ) >= VLC_A52_HEADER_SIZE )
765 A52CheckSync( p_peek, &p_sys->b_big_endian, true );
770 /*****************************************************************************
772 *****************************************************************************/
773 static int DtsCheckSync( const uint8_t *p_peek )
775 /* TODO return frame size for robustness */
777 /* 14 bits, little endian version of the bitstream */
778 if( p_peek[0] == 0xff && p_peek[1] == 0x1f &&
779 p_peek[2] == 0x00 && p_peek[3] == 0xe8 &&
780 (p_peek[4] & 0xf0) == 0xf0 && p_peek[5] == 0x07 )
784 /* 14 bits, big endian version of the bitstream */
785 else if( p_peek[0] == 0x1f && p_peek[1] == 0xff &&
786 p_peek[2] == 0xe8 && p_peek[3] == 0x00 &&
787 p_peek[4] == 0x07 && (p_peek[5] & 0xf0) == 0xf0)
791 /* 16 bits, big endian version of the bitstream */
792 else if( p_peek[0] == 0x7f && p_peek[1] == 0xfe &&
793 p_peek[2] == 0x80 && p_peek[3] == 0x01 )
797 /* 16 bits, little endian version of the bitstream */
798 else if( p_peek[0] == 0xfe && p_peek[1] == 0x7f &&
799 p_peek[2] == 0x01 && p_peek[3] == 0x80 )
807 static int DtsProbe( demux_t *p_demux, int64_t *pi_offset )
809 const char *ppsz_name[] = { "dts", NULL };
811 return GenericProbe( p_demux, pi_offset, ppsz_name, DtsCheckSync, 11 );
813 static int DtsInit( demux_t *p_demux )
815 demux_sys_t *p_sys = p_demux->p_sys;
817 p_sys->i_packet_size = 16384;
822 /*****************************************************************************
824 *****************************************************************************/
825 static int MlpCheckSync( const uint8_t *p_peek )
827 if( p_peek[4+0] != 0xf8 || p_peek[4+1] != 0x72 || p_peek[4+2] != 0x6f )
830 if( p_peek[4+3] != 0xba && p_peek[4+3] != 0xbb )
833 /* TODO checksum and real size for robustness */
836 static int MlpProbe( demux_t *p_demux, int64_t *pi_offset )
838 const char *ppsz_name[] = { "mlp", NULL };
840 return GenericProbe( p_demux, pi_offset, ppsz_name, MlpCheckSync, 4+28+16*4 );
842 static int MlpInit( demux_t *p_demux )
845 demux_sys_t *p_sys = p_demux->p_sys;
847 p_sys->i_packet_size = 4096;