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demux: es: fix swab usage
[vlc.git] / modules / demux / mpeg / es.c
blob54daf63f644776bd89bf2d319c97d3f667a1f9b3
1 /*****************************************************************************
2 * es.c : Generic audio ES input module for vlc
3 *****************************************************************************
4 * Copyright (C) 2001-2008 VLC authors and VideoLAN
5 * $Id$
6 *
7 * Authors: Laurent Aimar <fenrir@via.ecp.fr>
8 * Gildas Bazin <gbazin@videolan.org>
9 *
10 * This program is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU Lesser General Public License as published by
12 * the Free Software Foundation; either version 2.1 of the License, or
13 * (at your option) any later version.
14 *
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 Lesser General Public License for more details.
19 *
20 * You should have received a copy of the GNU Lesser General Public License
21 * along with this program; if not, write to the Free Software Foundation,
22 * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
23 *****************************************************************************/
24
25 /*****************************************************************************
26 * Preamble
27 *****************************************************************************/
28
29 #ifdef HAVE_CONFIG_H
30 # include "config.h"
31 #endif
32
33 #include <vlc_common.h>
34 #include <vlc_plugin.h>
35 #include <vlc_demux.h>
36 #include <vlc_codec.h>
37 #include <vlc_codecs.h>
38 #include <vlc_input.h>
39
40 #include "../../packetizer/a52.h"
41 #include "../../packetizer/dts_header.h"
42 #include "../meta_engine/ID3Tag.h"
43 #include "../meta_engine/ID3Text.h"
44 #include "../meta_engine/ID3Meta.h"
45
46 /*****************************************************************************
47 * Module descriptor
48 *****************************************************************************/
49 static int OpenAudio( vlc_object_t * );
50 static int OpenVideo( vlc_object_t * );
51 static void Close ( vlc_object_t * );
52
53 #define FPS_TEXT N_("Frames per Second")
54 #define FPS_LONGTEXT N_("This is the frame rate used as a fallback when " \
55 "playing MPEG video elementary streams.")
56
57 vlc_module_begin ()
58 set_category( CAT_INPUT )
59 set_subcategory( SUBCAT_INPUT_DEMUX )
60 set_description( N_("MPEG-I/II/4 / A52 / DTS / MLP audio" ) )
61 set_shortname( N_("Audio ES") )
62 set_capability( "demux", 155 )
63 set_callbacks( OpenAudio, Close )
64
65 add_shortcut( "mpga", "mp3",
66 "m4a", "mp4a", "aac",
67 "ac3", "a52",
68 "eac3",
69 "dts",
70 "mlp", "thd" )
71
72 add_submodule()
73 set_description( N_("MPEG-4 video" ) )
74 set_capability( "demux", 5 )
75 set_callbacks( OpenVideo, Close )
76 add_float( "es-fps", 25, FPS_TEXT, FPS_LONGTEXT, false )
77
78 add_shortcut( "m4v" )
79 add_shortcut( "mp4v" )
80 vlc_module_end ()
81
82 /*****************************************************************************
83 * Local prototypes
84 *****************************************************************************/
85 static int Demux ( demux_t * );
86 static int Control( demux_t *, int, va_list );
87
88 #define WAV_PROBE_SIZE (512*1024)
89 #define BASE_PROBE_SIZE (8000)
90 #define WAV_EXTRA_PROBE_SIZE (44000/2*2*2)
91
92 typedef struct
93 {
94 vlc_fourcc_t i_codec;
95 bool b_use_word;
96 const char *psz_name;
97 int (*pf_probe)( demux_t *p_demux, uint64_t *pi_offset );
98 int (*pf_init)( demux_t *p_demux );
99 } codec_t;
100
101 typedef struct
102 {
103 char psz_version[10];
104 int i_lowpass;
105 } lame_extra_t;
106
107 typedef struct
108 {
109 vlc_tick_t i_time;
110 uint64_t i_pos;
111 bs_t br;
112 } sync_table_ctx_t;
113
114 typedef struct
115 {
116 uint16_t i_frames_btw_refs;
117 uint32_t i_bytes_btw_refs;
118 uint32_t i_ms_btw_refs;
119 uint8_t i_bits_per_bytes_dev;
120 uint8_t i_bits_per_ms_dev;
121 uint8_t *p_bits;
122 size_t i_bits;
123 sync_table_ctx_t current;
124 } sync_table_t;
125
126 typedef struct
127 {
128 codec_t codec;
129 vlc_fourcc_t i_original;
130
131 es_out_id_t *p_es;
132
133 bool b_start;
134 decoder_t *p_packetizer;
135 block_t *p_packetized_data;
136
137 vlc_tick_t i_pts;
138 vlc_tick_t i_time_offset;
139 int64_t i_bytes;
140
141 bool b_big_endian;
142 bool b_estimate_bitrate;
143 int i_bitrate_avg; /* extracted from Xing header */
144
145 bool b_initial_sync_failed;
146
147 int i_packet_size;
148
149 uint64_t i_stream_offset;
150
151 float f_fps;
152
153 /* Mpga specific */
154 struct
155 {
156 int i_frames;
157 int i_bytes;
158 int i_bitrate_avg;
159 int i_frame_samples;
160 lame_extra_t lame;
161 bool b_lame;
162 } xing;
163
164 float rgf_replay_gain[AUDIO_REPLAY_GAIN_MAX];
165 float rgf_replay_peak[AUDIO_REPLAY_GAIN_MAX];
166
167 sync_table_t mllt;
168 } demux_sys_t;
169
170 static int MpgaProbe( demux_t *p_demux, uint64_t *pi_offset );
171 static int MpgaInit( demux_t *p_demux );
172
173 static int AacProbe( demux_t *p_demux, uint64_t *pi_offset );
174 static int AacInit( demux_t *p_demux );
175
176 static int EA52Probe( demux_t *p_demux, uint64_t *pi_offset );
177 static int A52Probe( demux_t *p_demux, uint64_t *pi_offset );
178 static int A52Init( demux_t *p_demux );
179
180 static int DtsProbe( demux_t *p_demux, uint64_t *pi_offset );
181 static int DtsInit( demux_t *p_demux );
182
183 static int MlpProbe( demux_t *p_demux, uint64_t *pi_offset );
184 static int ThdProbe( demux_t *p_demux, uint64_t *pi_offset );
185 static int MlpInit( demux_t *p_demux );
186
187 static bool Parse( demux_t *p_demux, block_t **pp_output );
188 static uint64_t SeekByMlltTable( demux_t *p_demux, vlc_tick_t *pi_time );
189
190 static const codec_t p_codecs[] = {
191 { VLC_CODEC_MP4A, false, "mp4 audio", AacProbe, AacInit },
192 { VLC_CODEC_MPGA, false, "mpeg audio", MpgaProbe, MpgaInit },
193 { VLC_CODEC_A52, true, "a52 audio", A52Probe, A52Init },
194 { VLC_CODEC_EAC3, true, "eac3 audio", EA52Probe, A52Init },
195 { VLC_CODEC_DTS, false, "dts audio", DtsProbe, DtsInit },
196 { VLC_CODEC_MLP, false, "mlp audio", MlpProbe, MlpInit },
197 { VLC_CODEC_TRUEHD, false, "TrueHD audio", ThdProbe, MlpInit },
198
199 { 0, false, NULL, NULL, NULL }
200 };
201
202 static int VideoInit( demux_t *p_demux );
203
204 static const codec_t codec_m4v = {
205 VLC_CODEC_MP4V, false, "mp4 video", NULL, VideoInit
206 };
207
208 /*****************************************************************************
209 * OpenCommon: initializes demux structures
210 *****************************************************************************/
211 static int OpenCommon( demux_t *p_demux,
212 int i_cat, const codec_t *p_codec, uint64_t i_bs_offset )
213 {
214 demux_sys_t *p_sys;
215
216 es_format_t fmt;
217
218 DEMUX_INIT_COMMON(); p_sys = p_demux->p_sys;
219 memset( p_sys, 0, sizeof( demux_sys_t ) );
220 p_sys->codec = *p_codec;
221 p_sys->p_es = NULL;
222 p_sys->b_start = true;
223 p_sys->i_stream_offset = i_bs_offset;
224 p_sys->b_estimate_bitrate = true;
225 p_sys->i_bitrate_avg = 0;
226 p_sys->b_big_endian = false;
227 p_sys->f_fps = var_InheritFloat( p_demux, "es-fps" );
228 p_sys->p_packetized_data = NULL;
229
230 if( vlc_stream_Seek( p_demux->s, p_sys->i_stream_offset ) )
231 {
232 free( p_sys );
233 return VLC_EGENERIC;
234 }
235
236 if( p_sys->codec.pf_init( p_demux ) )
237 {
238 free( p_sys );
239 return VLC_EGENERIC;
240 }
241
242 msg_Dbg( p_demux, "detected format %4.4s", (const char*)&p_sys->codec.i_codec );
243
244 /* Load the audio packetizer */
245 es_format_Init( &fmt, i_cat, p_sys->codec.i_codec );
246 fmt.i_original_fourcc = p_sys->i_original;
247 p_sys->p_packetizer = demux_PacketizerNew( p_demux, &fmt, p_sys->codec.psz_name );
248 if( !p_sys->p_packetizer )
249 {
250 free( p_sys );
251 return VLC_EGENERIC;
252 }
253
254 es_format_t *p_fmt = &p_sys->p_packetizer->fmt_out;
255 for( int i = 0; i < AUDIO_REPLAY_GAIN_MAX; i++ )
256 {
257 if ( p_sys->rgf_replay_gain[i] != 0.0 )
258 {
259 p_fmt->audio_replay_gain.pb_gain[i] = true;
260 p_fmt->audio_replay_gain.pf_gain[i] = p_sys->rgf_replay_gain[i];
261 }
262 if ( p_sys->rgf_replay_peak[i] != 0.0 )
263 {
264 p_fmt->audio_replay_gain.pb_peak[i] = true;
265 p_fmt->audio_replay_gain.pf_peak[i] = p_sys->rgf_replay_peak[i];
266 }
267 }
268
269 for( ;; )
270 {
271 if( Parse( p_demux, &p_sys->p_packetized_data ) )
272 break;
273 if( p_sys->p_packetized_data )
274 break;
275 }
276
277 return VLC_SUCCESS;
278 }
279 static int OpenAudio( vlc_object_t *p_this )
280 {
281 demux_t *p_demux = (demux_t*)p_this;
282 for( int i = 0; p_codecs[i].i_codec != 0; i++ )
283 {
284 uint64_t i_offset;
285 if( !p_codecs[i].pf_probe( p_demux, &i_offset ) )
286 return OpenCommon( p_demux, AUDIO_ES, &p_codecs[i], i_offset );
287 }
288 return VLC_EGENERIC;
289 }
290 static int OpenVideo( vlc_object_t *p_this )
291 {
292 demux_t *p_demux = (demux_t*)p_this;
293
294 /* Only m4v is supported for the moment */
295 bool b_m4v_ext = demux_IsPathExtension( p_demux, ".m4v" );
296 bool b_re4_ext = !b_m4v_ext && demux_IsPathExtension( p_demux, ".re4" );
297 bool b_m4v_forced = demux_IsForced( p_demux, "m4v" ) ||
298 demux_IsForced( p_demux, "mp4v" );
299
300 if( !b_m4v_ext && !b_m4v_forced && !b_re4_ext )
301 return VLC_EGENERIC;
302
303 ssize_t i_off = b_re4_ext ? 220 : 0;
304 const uint8_t *p_peek;
305 if( vlc_stream_Peek( p_demux->s, &p_peek, i_off + 4 ) < i_off + 4 )
306 return VLC_EGENERIC;
307 if( p_peek[i_off + 0] != 0x00 || p_peek[i_off + 1] != 0x00 || p_peek[i_off + 2] != 0x01 )
308 {
309 if( !b_m4v_forced)
310 return VLC_EGENERIC;
311 msg_Warn( p_demux,
312 "this doesn't look like an MPEG ES stream, continuing anyway" );
313 }
314 return OpenCommon( p_demux, VIDEO_ES, &codec_m4v, i_off );
315 }
316 /*****************************************************************************
317 * Demux: reads and demuxes data packets
318 *****************************************************************************
319 * Returns -1 in case of error, 0 in case of EOF, 1 otherwise
320 *****************************************************************************/
321 static int Demux( demux_t *p_demux )
322 {
323 int ret = 1;
324 demux_sys_t *p_sys = p_demux->p_sys;
325
326 block_t *p_block_out = p_sys->p_packetized_data;
327 if( p_block_out )
328 p_sys->p_packetized_data = NULL;
329 else
330 ret = Parse( p_demux, &p_block_out ) ? 0 : 1;
331
332 while( p_block_out )
333 {
334 block_t *p_next = p_block_out->p_next;
335
336 /* Correct timestamp */
337 if( p_sys->p_packetizer->fmt_out.i_cat == VIDEO_ES )
338 {
339 if( p_block_out->i_pts == VLC_TICK_INVALID &&
340 p_block_out->i_dts == VLC_TICK_INVALID )
341 p_block_out->i_dts = VLC_TICK_0 + p_sys->i_pts + VLC_TICK_FROM_SEC(1) / p_sys->f_fps;
342 if( p_block_out->i_dts != VLC_TICK_INVALID )
343 p_sys->i_pts = p_block_out->i_dts - VLC_TICK_0;
344 }
345 else
346 {
347 p_sys->i_pts = p_block_out->i_pts - VLC_TICK_0;
348 }
349
350 if( p_block_out->i_pts != VLC_TICK_INVALID )
351 {
352 p_block_out->i_pts += p_sys->i_time_offset;
353 }
354 if( p_block_out->i_dts != VLC_TICK_INVALID )
355 {
356 p_block_out->i_dts += p_sys->i_time_offset;
357 es_out_SetPCR( p_demux->out, p_block_out->i_dts );
358 }
359 /* Re-estimate bitrate */
360 if( p_sys->b_estimate_bitrate && p_sys->i_pts > VLC_TICK_FROM_MS(500) )
361 p_sys->i_bitrate_avg = 8 * CLOCK_FREQ * p_sys->i_bytes
362 / (p_sys->i_pts - 1);
363 p_sys->i_bytes += p_block_out->i_buffer;
364
365
366 p_block_out->p_next = NULL;
367 es_out_Send( p_demux->out, p_sys->p_es, p_block_out );
368
369 p_block_out = p_next;
370 }
371 return ret;
372 }
373
374 /*****************************************************************************
375 * Close: frees unused data
376 *****************************************************************************/
377 static void Close( vlc_object_t * p_this )
378 {
379 demux_t *p_demux = (demux_t*)p_this;
380 demux_sys_t *p_sys = p_demux->p_sys;
381
382 if( p_sys->p_packetized_data )
383 block_ChainRelease( p_sys->p_packetized_data );
384 if( p_sys->mllt.p_bits )
385 free( p_sys->mllt.p_bits );
386 demux_PacketizerDestroy( p_sys->p_packetizer );
387 free( p_sys );
388 }
389
390 /*****************************************************************************
391 * Control:
392 *****************************************************************************/
393 static int Control( demux_t *p_demux, int i_query, va_list args )
394 {
395 demux_sys_t *p_sys = p_demux->p_sys;
396 bool *pb_bool;
397
398 switch( i_query )
399 {
400 case DEMUX_HAS_UNSUPPORTED_META:
401 pb_bool = va_arg( args, bool * );
402 *pb_bool = true;
403 return VLC_SUCCESS;
404
405 case DEMUX_GET_TIME:
406 *va_arg( args, vlc_tick_t * ) = p_sys->i_pts + p_sys->i_time_offset;
407 return VLC_SUCCESS;
408
409 case DEMUX_GET_LENGTH:
410 {
411 va_list ap;
412 int i_ret;
413
414 va_copy ( ap, args );
415 i_ret = demux_vaControlHelper( p_demux->s, p_sys->i_stream_offset,
416 -1, p_sys->i_bitrate_avg, 1, i_query, ap );
417 va_end( ap );
418
419 /* No bitrate, we can't have it precisely, but we can compute
420 * a raw approximation with time/position */
421 if( i_ret && !p_sys->i_bitrate_avg )
422 {
423 float f_pos = (double)(uint64_t)( vlc_stream_Tell( p_demux->s ) ) /
424 (double)(uint64_t)( stream_Size( p_demux->s ) );
425 /* The first few seconds are guaranteed to be very whacky,
426 * don't bother trying ... Too bad */
427 if( f_pos < 0.01f ||
428 (p_sys->i_pts + p_sys->i_time_offset) < VLC_TICK_FROM_SEC(8) )
429 {
430 return VLC_EGENERIC;
431 }
432
433 *va_arg( args, vlc_tick_t * ) =
434 (p_sys->i_pts + p_sys->i_time_offset) / f_pos;
435 return VLC_SUCCESS;
436 }
437 return i_ret;
438 }
439
440 case DEMUX_SET_TIME:
441 if( p_sys->mllt.p_bits )
442 {
443 vlc_tick_t i_time = va_arg(args, vlc_tick_t);
444 uint64_t i_pos = SeekByMlltTable( p_demux, &i_time );
445 int i_ret = vlc_stream_Seek( p_demux->s, p_sys->i_stream_offset + i_pos );
446 if( i_ret != VLC_SUCCESS )
447 return i_ret;
448 p_sys->i_time_offset = i_time - p_sys->i_pts;
449 /* And reset buffered data */
450 if( p_sys->p_packetized_data )
451 block_ChainRelease( p_sys->p_packetized_data );
452 p_sys->p_packetized_data = NULL;
453 return VLC_SUCCESS;
454 }
455 /* FIXME TODO: implement a high precision seek (with mp3 parsing)
456 * needed for multi-input */
457 break;
458 }
459
460 int ret = demux_vaControlHelper( p_demux->s, p_sys->i_stream_offset, -1,
461 p_sys->i_bitrate_avg, 1, i_query, args );
462 if( ret != VLC_SUCCESS )
463 return ret;
464
465 if( p_sys->i_bitrate_avg > 0
466 && (i_query == DEMUX_SET_POSITION || i_query == DEMUX_SET_TIME) )
467 {
468 int64_t i_time = INT64_C(8000000)
469 * ( vlc_stream_Tell(p_demux->s) - p_sys->i_stream_offset )
470 / p_sys->i_bitrate_avg;
471
472 /* Fix time_offset */
473 if( i_time >= 0 )
474 p_sys->i_time_offset = i_time - p_sys->i_pts;
475 /* And reset buffered data */
476 if( p_sys->p_packetized_data )
477 block_ChainRelease( p_sys->p_packetized_data );
478 p_sys->p_packetized_data = NULL;
479 }
480 return VLC_SUCCESS;
481 }
482
483 /*****************************************************************************
484 * Makes a link list of buffer of parsed data
485 * Returns true if EOF
486 *****************************************************************************/
487 static bool Parse( demux_t *p_demux, block_t **pp_output )
488 {
489 demux_sys_t *p_sys = p_demux->p_sys;
490 block_t *p_block_in, *p_block_out;
491
492 *pp_output = NULL;
493
494 if( p_sys->codec.b_use_word )
495 {
496 /* Make sure we are word aligned */
497 int64_t i_pos = vlc_stream_Tell( p_demux->s );
498 if( (i_pos & 1) && vlc_stream_Read( p_demux->s, NULL, 1 ) != 1 )
499 return true;
500 }
501
502 p_block_in = vlc_stream_Block( p_demux->s, p_sys->i_packet_size );
503 bool b_eof = p_block_in == NULL;
504
505 if( p_block_in )
506 {
507 if( p_sys->codec.b_use_word && !p_sys->b_big_endian && p_block_in->i_buffer > 0 )
508 {
509 /* Convert to big endian */
510 block_t *old = p_block_in;
511 p_block_in = block_Alloc( p_block_in->i_buffer );
512 if( p_block_in )
513 {
514 block_CopyProperties( p_block_in, old );
515 swab( old->p_buffer, p_block_in->p_buffer, old->i_buffer );
516 }
517 block_Release( old );
518 }
519
520 if( p_block_in )
521 {
522 p_block_in->i_pts =
523 p_block_in->i_dts = (p_sys->b_start || p_sys->b_initial_sync_failed) ?
524 VLC_TICK_0 : VLC_TICK_INVALID;
525 }
526 }
527 p_sys->b_initial_sync_failed = p_sys->b_start; /* Only try to resync once */
528
529 while( ( p_block_out = p_sys->p_packetizer->pf_packetize( p_sys->p_packetizer, p_block_in ? &p_block_in : NULL ) ) )
530 {
531 p_sys->b_initial_sync_failed = false;
532 while( p_block_out )
533 {
534 if( !p_sys->p_es )
535 {
536 p_sys->p_packetizer->fmt_out.b_packetized = true;
537 p_sys->p_es = es_out_Add( p_demux->out,
538 &p_sys->p_packetizer->fmt_out);
539
540
541 /* Try the xing header */
542 if( p_sys->xing.i_bytes && p_sys->xing.i_frames &&
543 p_sys->xing.i_frame_samples )
544 {
545 p_sys->i_bitrate_avg = p_sys->xing.i_bytes * INT64_C(8) *
546 p_sys->p_packetizer->fmt_out.audio.i_rate /
547 p_sys->xing.i_frames / p_sys->xing.i_frame_samples;
548
549 if( p_sys->i_bitrate_avg > 0 )
550 p_sys->b_estimate_bitrate = false;
551 }
552 /* Use the bitrate as initual value */
553 if( p_sys->b_estimate_bitrate )
554 p_sys->i_bitrate_avg = p_sys->p_packetizer->fmt_out.i_bitrate;
555 }
556
557 block_t *p_next = p_block_out->p_next;
558 p_block_out->p_next = NULL;
559
560 block_ChainLastAppend( &pp_output, p_block_out );
561
562 p_block_out = p_next;
563 }
564 }
565
566 if( p_sys->b_initial_sync_failed )
567 msg_Dbg( p_demux, "did not sync on first block" );
568 p_sys->b_start = false;
569
570 return b_eof;
571 }
572
573 /* Check to apply to WAVE fmt header */
574 static int GenericFormatCheck( int i_format, const uint8_t *p_head )
575 {
576 if ( i_format == WAVE_FORMAT_PCM )
577 {
578 if( GetWLE( p_head /* nChannels */ ) != 2 )
579 return VLC_EGENERIC;
580 if( GetDWLE( p_head + 2 /* nSamplesPerSec */ ) != 44100 )
581 return VLC_EGENERIC;
582 }
583 return VLC_SUCCESS;
584 }
585
586 /*****************************************************************************
587 * Wav header skipper
588 *****************************************************************************/
589 static int WavSkipHeader( demux_t *p_demux, uint64_t *pi_skip,
590 const uint16_t rgi_twocc[],
591 int (*pf_format_check)( int, const uint8_t * ) )
592 {
593 const uint8_t *p_peek;
594 size_t i_peek = 0;
595 uint32_t i_len;
596
597 /* */
598 *pi_skip = 0;
599
600 /* Check if we are dealing with a WAV file */
601 if( vlc_stream_Peek( p_demux->s, &p_peek, 12+8 ) != 12 + 8 )
602 return VLC_SUCCESS;
603
604 if( memcmp( p_peek, "RIFF", 4 ) || memcmp( &p_peek[8], "WAVE", 4 ) )
605 return VLC_SUCCESS;
606
607 /* Find the wave format header */
608 i_peek = 12 + 8;
609 while( memcmp( p_peek + i_peek - 8, "fmt ", 4 ) )
610 {
611 i_len = GetDWLE( p_peek + i_peek - 4 );
612 if( i_len > WAV_PROBE_SIZE || i_peek + i_len > WAV_PROBE_SIZE )
613 return VLC_EGENERIC;
614
615 i_peek += i_len + 8;
616 if( vlc_stream_Peek( p_demux->s, &p_peek, i_peek ) != (ssize_t) i_peek )
617 return VLC_EGENERIC;
618 }
619
620 /* Sanity check the wave format header */
621 i_len = GetDWLE( p_peek + i_peek - 4 );
622 if( i_len > WAV_PROBE_SIZE )
623 return VLC_EGENERIC;
624
625 i_peek += i_len + 8;
626 if( vlc_stream_Peek( p_demux->s, &p_peek, i_peek ) != (ssize_t) i_peek )
627 return VLC_EGENERIC;
628 const uint16_t i_twocc = GetWLE( p_peek + i_peek - i_len - 8 /* wFormatTag */ );
629 int i_format_idx;
630 for( i_format_idx = 0; rgi_twocc[i_format_idx] != WAVE_FORMAT_UNKNOWN; i_format_idx++ )
631 {
632 if( i_twocc == rgi_twocc[i_format_idx] )
633 break;
634 }
635 if( rgi_twocc[i_format_idx] == WAVE_FORMAT_UNKNOWN )
636 return VLC_EGENERIC;
637
638 if( pf_format_check &&
639 pf_format_check( i_twocc, p_peek + i_peek - i_len - 6 ) != VLC_SUCCESS )
640 return VLC_EGENERIC;
641
642 /* Skip the wave header */
643 while( memcmp( p_peek + i_peek - 8, "data", 4 ) )
644 {
645 i_len = GetDWLE( p_peek + i_peek - 4 );
646 if( i_len > WAV_PROBE_SIZE || i_peek + i_len > WAV_PROBE_SIZE )
647 return VLC_EGENERIC;
648
649 i_peek += i_len + 8;
650 if( vlc_stream_Peek( p_demux->s, &p_peek, i_peek ) != (ssize_t) i_peek )
651 return VLC_EGENERIC;
652 }
653 *pi_skip = i_peek;
654 return VLC_SUCCESS;
655 }
656
657 static int GenericProbe( demux_t *p_demux, uint64_t *pi_offset,
658 const char * ppsz_name[],
659 int (*pf_check)( const uint8_t *, unsigned * ),
660 unsigned i_check_size,
661 unsigned i_base_probing,
662 unsigned i_wav_extra_probing,
663 bool b_use_word,
664 const uint16_t pi_twocc[],
665 int (*pf_format_check)( int, const uint8_t * ) )
666 {
667 bool b_forced_demux;
668
669 uint64_t i_offset;
670 const uint8_t *p_peek;
671 uint64_t i_skip;
672
673 b_forced_demux = false;
674 for( size_t i = 0; ppsz_name[i] != NULL; i++ )
675 {
676 b_forced_demux |= demux_IsForced( p_demux, ppsz_name[i] );
677 }
678
679 i_offset = vlc_stream_Tell( p_demux->s );
680
681 if( WavSkipHeader( p_demux, &i_skip, pi_twocc, pf_format_check ) )
682 {
683 if( !b_forced_demux )
684 return VLC_EGENERIC;
685 }
686 const bool b_wav = i_skip > 0;
687
688 /* peek the begining
689 * It is common that wav files have some sort of garbage at the begining
690 * We will accept probing 0.5s of data in this case.
691 */
692 const size_t i_probe = i_skip + i_check_size + i_base_probing + ( b_wav ? i_wav_extra_probing : 0);
693 const size_t i_peek = vlc_stream_Peek( p_demux->s, &p_peek, i_probe );
694 if( i_peek < i_skip + i_check_size )
695 {
696 msg_Dbg( p_demux, "cannot peek" );
697 return VLC_EGENERIC;
698 }
699 for( ;; )
700 {
701 if( i_skip + i_check_size > i_peek )
702 {
703 if( !b_forced_demux )
704 return VLC_EGENERIC;
705 break;
706 }
707 unsigned i_samples = 0;
708 int i_size = pf_check( &p_peek[i_skip], &i_samples );
709 if( i_size >= 0 )
710 {
711 if( i_size == 0 || /* 0 sized frame ?? */
712 i_skip == 0 /* exact match from start, we're not WAVE either, so skip multiple checks (would break if padding) */ )
713 break;
714
715 /* If we have the frame size, check the next frame for
716 * extra robustness
717 * The second test is because some .wav have paddings
718 */
719 bool b_ok = false;
720 for( int t = 0; t < 1 + !!b_wav; t++ )
721 {
722 if( t == 1 )
723 {
724 if(!i_samples)
725 break;
726 i_size = i_samples * 2 * 2;
727 }
728
729 if( i_skip + i_check_size + i_size <= i_peek )
730 {
731 b_ok = pf_check( &p_peek[i_skip+i_size], NULL ) >= 0;
732 if( b_ok )
733 break;
734 }
735 }
736 if( b_ok )
737 break;
738 }
739 if( b_use_word )
740 i_skip += ((i_offset + i_skip) % 2 == 0) ? 2 : 1;
741 else
742 i_skip++;
743 if( !b_wav && !b_forced_demux )
744 return VLC_EGENERIC;
745 }
746
747 *pi_offset = i_offset + i_skip;
748 return VLC_SUCCESS;
749 }
750
751 /*****************************************************************************
752 * Mpeg I/II Audio
753 *****************************************************************************/
754 static int MpgaCheckSync( const uint8_t *p_peek )
755 {
756 uint32_t h = GetDWBE( p_peek );
757
758 if( ((( h >> 21 )&0x07FF) != 0x07FF ) /* header sync */
759 || (((h >> 19)&0x03) == 1 ) /* valid version ID ? */
760 || (((h >> 17)&0x03) == 0 ) /* valid layer ?*/
761 || (((h >> 12)&0x0F) == 0x0F ) /* valid bitrate ?*/
762 || (((h >> 10) & 0x03) == 0x03 ) /* valide sampling freq ? */
763 || ((h & 0x03) == 0x02 )) /* valid emphasis ? */
764 {
765 return false;
766 }
767 return true;
768 }
769
770 #define MPGA_VERSION( h ) ( 1 - (((h)>>19)&0x01) )
771 #define MPGA_MODE(h) (((h)>> 6)&0x03)
772
773 static int MpgaGetFrameSamples( uint32_t h )
774 {
775 const int i_layer = 3 - (((h)>>17)&0x03);
776 switch( i_layer )
777 {
778 case 0:
779 return 384;
780 case 1:
781 return 1152;
782 case 2:
783 return MPGA_VERSION(h) ? 576 : 1152;
784 default:
785 return 0;
786 }
787 }
788
789 static int MpgaProbe( demux_t *p_demux, uint64_t *pi_offset )
790 {
791 const uint16_t rgi_twocc[] = { WAVE_FORMAT_MPEG, WAVE_FORMAT_MPEGLAYER3, WAVE_FORMAT_UNKNOWN };
792 bool b_forced;
793 bool b_forced_demux;
794 uint64_t i_offset;
795
796 const uint8_t *p_peek;
797 uint64_t i_skip;
798 ssize_t i_peek;
799
800 b_forced = demux_IsPathExtension( p_demux, ".mp3" );
801 b_forced_demux = demux_IsForced( p_demux, "mp3" ) ||
802 demux_IsForced( p_demux, "mpga" );
803
804 i_offset = vlc_stream_Tell( p_demux->s );
805
806 if( WavSkipHeader( p_demux, &i_skip, rgi_twocc, NULL ) )
807 {
808 if( !b_forced_demux )
809 return VLC_EGENERIC;
810
811 return VLC_EGENERIC;
812 }
813
814 i_peek = vlc_stream_Peek( p_demux->s, &p_peek, i_skip + 4 );
815 if( i_peek <= 0 || (uint64_t) i_peek < i_skip + 4 )
816 return VLC_EGENERIC;
817
818 if( !MpgaCheckSync( &p_peek[i_skip] ) )
819 {
820 bool b_ok = false;
821
822 if( !b_forced_demux && !b_forced )
823 return VLC_EGENERIC;
824
825 i_peek = vlc_stream_Peek( p_demux->s, &p_peek, i_skip + 8096 );
826 while( i_peek > 0 && i_skip + 4 < (uint64_t) i_peek )
827 {
828 if( MpgaCheckSync( &p_peek[i_skip] ) )
829 {
830 b_ok = true;
831 break;
832 }
833 i_skip++;
834 }
835 if( !b_ok && !b_forced_demux )
836 return VLC_EGENERIC;
837 }
838 *pi_offset = i_offset + i_skip;
839 return VLC_SUCCESS;
840 }
841
842 static void MpgaXingSkip( const uint8_t **pp_xing, int *pi_xing, int i_count )
843 {
844 if(i_count > *pi_xing )
845 i_count = *pi_xing;
846
847 (*pp_xing) += i_count;
848 (*pi_xing) -= i_count;
849 }
850
851 static uint32_t MpgaXingGetDWBE( const uint8_t **pp_xing, int *pi_xing, uint32_t i_default )
852 {
853 if( *pi_xing < 4 )
854 return i_default;
855
856 uint32_t v = GetDWBE( *pp_xing );
857
858 MpgaXingSkip( pp_xing, pi_xing, 4 );
859
860 return v;
861 }
862
863 static uint16_t MpgaXingGetWBE( const uint8_t **pp_xing, int *pi_xing, uint16_t i_default )
864 {
865 if( *pi_xing < 2 )
866 return i_default;
867
868 uint16_t v = GetWBE( *pp_xing );
869
870 MpgaXingSkip( pp_xing, pi_xing, 2 );
871
872 return v;
873 }
874
875 static double MpgaXingLameConvertGain( uint16_t x )
876 {
877 double gain = (x & 0x1FF) / 10.0;
878
879 return x & 0x200 ? -gain : gain;
880 }
881
882 static double MpgaXingLameConvertPeak( uint32_t x )
883 {
884 return x / 8388608.0; /* pow(2, 23) */
885 }
886
887 static uint64_t SeekByMlltTable( demux_t *p_demux, vlc_tick_t *pi_time )
888 {
889 demux_sys_t *p_sys = p_demux->p_sys;
890 sync_table_ctx_t *p_cur = &p_sys->mllt.current;
891
892 /* reset or init context */
893 if( *pi_time < p_cur->i_time || !p_cur->br.p )
894 {
895 p_cur->i_time = 0;
896 p_cur->i_pos = 0;
897 bs_init(&p_cur->br, p_sys->mllt.p_bits, p_sys->mllt.i_bits);
898 }
899
900 while(bs_remain(&p_cur->br) >= p_sys->mllt.i_bits_per_bytes_dev + p_sys->mllt.i_bits_per_ms_dev)
901 {
902 const uint32_t i_bytesdev = bs_read(&p_cur->br, p_sys->mllt.i_bits_per_bytes_dev);
903 const uint32_t i_msdev = bs_read(&p_cur->br, p_sys->mllt.i_bits_per_ms_dev);
904 const vlc_tick_t i_deltatime = VLC_TICK_FROM_MS(p_sys->mllt.i_ms_btw_refs + i_msdev);
905 if( p_cur->i_time + i_deltatime > *pi_time )
906 break;
907 p_cur->i_time += i_deltatime;
908 p_cur->i_pos += p_sys->mllt.i_bytes_btw_refs + i_bytesdev;
909 }
910 *pi_time = p_cur->i_time;
911 return p_cur->i_pos;
912 }
913
914 static int ID3TAG_Parse_Handler( uint32_t i_tag, const uint8_t *p_payload, size_t i_payload, void *p_priv )
915 {
916 demux_t *p_demux = (demux_t *) p_priv;
917 demux_sys_t *p_sys = p_demux->p_sys;
918
919 if( i_tag == VLC_FOURCC('M', 'L', 'L', 'T') )
920 {
921 if( i_payload > 20 )
922 {
923 p_sys->mllt.i_frames_btw_refs = GetWBE(p_payload);
924 p_sys->mllt.i_bytes_btw_refs = GetDWBE(&p_payload[1]) & 0x00FFFFFF;
925 p_sys->mllt.i_ms_btw_refs = GetDWBE(&p_payload[4]) & 0x00FFFFFF;
926 if( !p_sys->mllt.i_frames_btw_refs || !p_sys->mllt.i_bytes_btw_refs ||
927 !p_sys->mllt.i_ms_btw_refs ||
928 p_payload[8] > 31 || p_payload[9] > 31 || /* bits length sanity check */
929 ((p_payload[8] + p_payload[9]) % 4) || p_payload[8] + p_payload[9] < 4 )
930 return VLC_EGENERIC;
931 p_sys->mllt.i_bits_per_bytes_dev = p_payload[8];
932 p_sys->mllt.i_bits_per_ms_dev = p_payload[9];
933 p_sys->mllt.p_bits = malloc(i_payload - 10);
934 if( likely(p_sys->mllt.p_bits) )
935 {
936 p_sys->mllt.i_bits = i_payload - 10;
937 memcpy(p_sys->mllt.p_bits, &p_payload[10], p_sys->mllt.i_bits);
938 msg_Dbg(p_demux, "read MLLT sync table with %zu entries",
939 (p_sys->mllt.i_bits * 8) / (p_sys->mllt.i_bits_per_bytes_dev + p_sys->mllt.i_bits_per_ms_dev) );
940 }
941 }
942 return VLC_EGENERIC;
943 }
944 else if( i_tag == VLC_FOURCC('T', 'X', 'X', 'X') )
945 {
946 vlc_meta_t *p_meta = vlc_meta_New();
947 if( p_meta )
948 {
949 bool b_updated;
950 if( ID3HandleTag( p_payload, i_payload, i_tag, p_meta, &b_updated ) )
951 {
952 char ** ppsz_keys = vlc_meta_CopyExtraNames( p_meta );
953 if( ppsz_keys )
954 {
955 for( size_t i = 0; ppsz_keys[i]; ++i )
956 {
957 float *pf = NULL;
958 if( !strcasecmp( ppsz_keys[i], "REPLAYGAIN_TRACK_GAIN" ) )
959 pf = &p_sys->rgf_replay_gain[AUDIO_REPLAY_GAIN_TRACK];
960 else if( !strcasecmp( ppsz_keys[i], "REPLAYGAIN_TRACK_PEAK" ) )
961 pf = &p_sys->rgf_replay_peak[AUDIO_REPLAY_GAIN_TRACK];
962 else if( !strcasecmp( ppsz_keys[i], "REPLAYGAIN_ALBUM_GAIN" ) )
963 pf = &p_sys->rgf_replay_gain[AUDIO_REPLAY_GAIN_ALBUM];
964 else if( !strcasecmp( ppsz_keys[i], "REPLAYGAIN_ALBUM_PEAK" ) )
965 pf = &p_sys->rgf_replay_peak[AUDIO_REPLAY_GAIN_ALBUM];
966 if( pf )
967 {
968 const char *psz_val = vlc_meta_GetExtra( p_meta, ppsz_keys[i] );
969 if( psz_val )
970 *pf = us_atof( psz_val );
971 }
972 free( ppsz_keys[i] );
973 }
974 free( ppsz_keys );
975 }
976 }
977 vlc_meta_Delete( p_meta );
978 }
979 }
980
981 return VLC_SUCCESS;
982 }
983
984 static int ID3Parse( demux_t *p_demux,
985 int (*pf_callback)(uint32_t, const uint8_t *, size_t, void *) )
986 {
987 const block_t *p_tags = NULL;
988
989 if( vlc_stream_Control( p_demux->s, STREAM_GET_TAGS, &p_tags ) != VLC_SUCCESS )
990 return VLC_EGENERIC;
991
992 for( ; p_tags; p_tags = p_tags->p_next )
993 ID3TAG_Parse( p_tags->p_buffer, p_tags->i_buffer, pf_callback, (void *) p_demux );
994
995 return VLC_SUCCESS;
996 }
997
998 static int MpgaInit( demux_t *p_demux )
999 {
1000 demux_sys_t *p_sys = p_demux->p_sys;
1001
1002 const uint8_t *p_peek;
1003 int i_peek;
1004
1005 /* */
1006 p_sys->i_packet_size = 1024;
1007
1008 ID3Parse( p_demux, ID3TAG_Parse_Handler );
1009
1010 /* Load a potential xing header */
1011 i_peek = vlc_stream_Peek( p_demux->s, &p_peek, 4 + 1024 );
1012 if( i_peek < 4 + 21 )
1013 return VLC_SUCCESS;
1014
1015 const uint32_t header = GetDWBE( p_peek );
1016 if( !MpgaCheckSync( p_peek ) )
1017 return VLC_SUCCESS;
1018
1019 /* Xing header */
1020 const uint8_t *p_xing = p_peek;
1021 int i_xing = i_peek;
1022 int i_skip;
1023
1024 if( MPGA_VERSION( header ) == 0 )
1025 i_skip = MPGA_MODE( header ) != 3 ? 36 : 21;
1026 else
1027 i_skip = MPGA_MODE( header ) != 3 ? 21 : 13;
1028
1029 if( i_skip + 8 >= i_xing || memcmp( &p_xing[i_skip], "Xing", 4 ) )
1030 return VLC_SUCCESS;
1031
1032 const uint32_t i_flags = GetDWBE( &p_xing[i_skip+4] );
1033
1034 MpgaXingSkip( &p_xing, &i_xing, i_skip + 8 );
1035
1036 if( i_flags&0x01 )
1037 p_sys->xing.i_frames = MpgaXingGetDWBE( &p_xing, &i_xing, 0 );
1038 if( i_flags&0x02 )
1039 p_sys->xing.i_bytes = MpgaXingGetDWBE( &p_xing, &i_xing, 0 );
1040 if( i_flags&0x04 ) /* TODO Support XING TOC to improve seeking accuracy */
1041 MpgaXingSkip( &p_xing, &i_xing, 100 );
1042 if( i_flags&0x08 )
1043 {
1044 /* FIXME: doesn't return the right bitrage average, at least
1045 with some MP3's */
1046 p_sys->xing.i_bitrate_avg = MpgaXingGetDWBE( &p_xing, &i_xing, 0 );
1047 msg_Dbg( p_demux, "xing vbr value present (%d)",
1048 p_sys->xing.i_bitrate_avg );
1049 }
1050
1051 if( p_sys->xing.i_frames > 0 && p_sys->xing.i_bytes > 0 )
1052 {
1053 p_sys->xing.i_frame_samples = MpgaGetFrameSamples( header );
1054 msg_Dbg( p_demux, "xing frames&bytes value present "
1055 "(%d bytes, %d frames, %d samples/frame)",
1056 p_sys->xing.i_bytes, p_sys->xing.i_frames,
1057 p_sys->xing.i_frame_samples );
1058 }
1059
1060 if( i_xing >= 20 && memcmp( p_xing, "LAME", 4 ) == 0)
1061 {
1062 p_sys->xing.b_lame = true;
1063 lame_extra_t *p_lame = &p_sys->xing.lame;
1064
1065 memcpy( p_lame->psz_version, p_xing, 9 );
1066 p_lame->psz_version[9] = '\0';
1067
1068 MpgaXingSkip( &p_xing, &i_xing, 9 );
1069 MpgaXingSkip( &p_xing, &i_xing, 1 ); /* rev_method */
1070
1071 p_lame->i_lowpass = (*p_xing) * 100;
1072 MpgaXingSkip( &p_xing, &i_xing, 1 );
1073
1074 uint32_t peak = MpgaXingGetDWBE( &p_xing, &i_xing, 0 );
1075 uint16_t track = MpgaXingGetWBE( &p_xing, &i_xing, 0 );
1076 uint16_t album = MpgaXingGetWBE( &p_xing, &i_xing, 0 );
1077
1078 p_sys->rgf_replay_peak[AUDIO_REPLAY_GAIN_TRACK] = (float) MpgaXingLameConvertPeak( peak );
1079 p_sys->rgf_replay_gain[AUDIO_REPLAY_GAIN_TRACK] = (float) MpgaXingLameConvertGain( track );
1080 p_sys->rgf_replay_gain[AUDIO_REPLAY_GAIN_ALBUM] = (float) MpgaXingLameConvertGain( album );
1081
1082 MpgaXingSkip( &p_xing, &i_xing, 1 ); /* flags */
1083 }
1084
1085 return VLC_SUCCESS;
1086 }
1087
1088 /*****************************************************************************
1089 * AAC
1090 *****************************************************************************/
1091 static int AacProbe( demux_t *p_demux, uint64_t *pi_offset )
1092 {
1093 bool b_forced;
1094 bool b_forced_demux;
1095
1096 uint64_t i_offset;
1097 const uint8_t *p_peek;
1098
1099 b_forced = demux_IsPathExtension( p_demux, ".aac" ) ||
1100 demux_IsPathExtension( p_demux, ".aacp" );
1101 b_forced_demux = demux_IsForced( p_demux, "m4a" ) ||
1102 demux_IsForced( p_demux, "aac" ) ||
1103 demux_IsForced( p_demux, "mp4a" );
1104
1105 if( !b_forced_demux && !b_forced )
1106 return VLC_EGENERIC;
1107
1108 i_offset = vlc_stream_Tell( p_demux->s );
1109
1110 /* peek the begining (10 is for adts header) */
1111 if( vlc_stream_Peek( p_demux->s, &p_peek, 10 ) < 10 )
1112 {
1113 msg_Dbg( p_demux, "cannot peek" );
1114 return VLC_EGENERIC;
1115 }
1116 if( !strncmp( (char *)p_peek, "ADIF", 4 ) )
1117 {
1118 msg_Err( p_demux, "ADIF file. Not yet supported. (Please report)" );
1119 return VLC_EGENERIC;
1120 }
1121
1122 *pi_offset = i_offset;
1123 return VLC_SUCCESS;
1124 }
1125 static int AacInit( demux_t *p_demux )
1126 {
1127 demux_sys_t *p_sys = p_demux->p_sys;
1128
1129 p_sys->i_packet_size = 4096;
1130 p_sys->i_original = VLC_FOURCC('H','E','A','D');
1131
1132 return VLC_SUCCESS;
1133 }
1134
1135
1136 /*****************************************************************************
1137 * A52
1138 *****************************************************************************/
1139 static int A52CheckSync( const uint8_t *p_peek, bool *p_big_endian, unsigned *pi_samples, bool b_eac3 )
1140 {
1141 vlc_a52_header_t header;
1142 uint8_t p_tmp[VLC_A52_MIN_HEADER_SIZE];
1143
1144 *p_big_endian = p_peek[0] == 0x0b && p_peek[1] == 0x77;
1145 if( !*p_big_endian )
1146 {
1147 swab( p_peek, p_tmp, VLC_A52_MIN_HEADER_SIZE );
1148 p_peek = p_tmp;
1149 }
1150
1151 if( vlc_a52_header_Parse( &header, p_peek, VLC_A52_MIN_HEADER_SIZE ) )
1152 return VLC_EGENERIC;
1153
1154 if( !header.b_eac3 != !b_eac3 )
1155 return VLC_EGENERIC;
1156 if( pi_samples )
1157 *pi_samples = header.i_samples;
1158 return header.i_size;
1159 }
1160 static int EA52CheckSyncProbe( const uint8_t *p_peek, unsigned *pi_samples )
1161 {
1162 bool b_dummy;
1163 return A52CheckSync( p_peek, &b_dummy, pi_samples, true );
1164 }
1165
1166 static int EA52Probe( demux_t *p_demux, uint64_t *pi_offset )
1167 {
1168 const char *ppsz_name[] = { "eac3", NULL };
1169 const uint16_t rgi_twocc[] = { WAVE_FORMAT_PCM, WAVE_FORMAT_A52, WAVE_FORMAT_UNKNOWN };
1170
1171 return GenericProbe( p_demux, pi_offset, ppsz_name, EA52CheckSyncProbe,
1172 VLC_A52_MIN_HEADER_SIZE,
1173 1920 + VLC_A52_MIN_HEADER_SIZE + 1,
1174 WAV_EXTRA_PROBE_SIZE,
1175 true, rgi_twocc, GenericFormatCheck );
1176 }
1177
1178 static int A52CheckSyncProbe( const uint8_t *p_peek, unsigned *pi_samples )
1179 {
1180 bool b_dummy;
1181 return A52CheckSync( p_peek, &b_dummy, pi_samples, false );
1182 }
1183
1184 static int A52Probe( demux_t *p_demux, uint64_t *pi_offset )
1185 {
1186 const char *ppsz_name[] = { "a52", "ac3", NULL };
1187 const uint16_t rgi_twocc[] = { WAVE_FORMAT_PCM, WAVE_FORMAT_A52, WAVE_FORMAT_UNKNOWN };
1188
1189 return GenericProbe( p_demux, pi_offset, ppsz_name, A52CheckSyncProbe,
1190 VLC_A52_MIN_HEADER_SIZE,
1191 1920 + VLC_A52_MIN_HEADER_SIZE + 1,
1192 WAV_EXTRA_PROBE_SIZE,
1193 true, rgi_twocc, GenericFormatCheck );
1194 }
1195
1196 static int A52Init( demux_t *p_demux )
1197 {
1198 demux_sys_t *p_sys = p_demux->p_sys;
1199
1200 p_sys->b_big_endian = false;
1201 p_sys->i_packet_size = 1024;
1202
1203 const uint8_t *p_peek;
1204
1205 /* peek the begining */
1206 if( vlc_stream_Peek( p_demux->s, &p_peek, VLC_A52_MIN_HEADER_SIZE ) >= VLC_A52_MIN_HEADER_SIZE )
1207 {
1208 A52CheckSync( p_peek, &p_sys->b_big_endian, NULL, true );
1209 }
1210 return VLC_SUCCESS;
1211 }
1212
1213 /*****************************************************************************
1214 * DTS
1215 *****************************************************************************/
1216 static int DtsCheckSync( const uint8_t *p_peek, unsigned *pi_samples )
1217 {
1218 VLC_UNUSED(pi_samples);
1219
1220 vlc_dts_header_t dts;
1221 if( vlc_dts_header_Parse( &dts, p_peek, VLC_DTS_HEADER_SIZE ) == VLC_SUCCESS
1222 && dts.i_frame_size > 0 && dts.i_frame_size <= 8192 )
1223 {
1224 if( pi_samples )
1225 *pi_samples = dts.i_frame_length;
1226 return dts.i_frame_size;
1227 }
1228 else
1229 return VLC_EGENERIC;
1230 }
1231
1232 static int DtsProbe( demux_t *p_demux, uint64_t *pi_offset )
1233 {
1234 const char *ppsz_name[] = { "dts", NULL };
1235 const uint16_t rgi_twocc[] = { WAVE_FORMAT_PCM, WAVE_FORMAT_DTS, WAVE_FORMAT_UNKNOWN };
1236
1237 return GenericProbe( p_demux, pi_offset, ppsz_name, DtsCheckSync,
1238 VLC_DTS_HEADER_SIZE,
1239 16384 + VLC_DTS_HEADER_SIZE + 1,
1240 WAV_EXTRA_PROBE_SIZE,
1241 false, rgi_twocc, NULL );
1242 }
1243 static int DtsInit( demux_t *p_demux )
1244 {
1245 demux_sys_t *p_sys = p_demux->p_sys;
1246
1247 p_sys->i_packet_size = 16384;
1248
1249 return VLC_SUCCESS;
1250 }
1251
1252 /*****************************************************************************
1253 * MLP
1254 *****************************************************************************/
1255 static int MlpCheckSync( const uint8_t *p_peek, unsigned *pi_samples )
1256 {
1257 if( p_peek[4+0] != 0xf8 || p_peek[4+1] != 0x72 || p_peek[4+2] != 0x6f )
1258 return -1;
1259
1260 if( p_peek[4+3] != 0xbb )
1261 return -1;
1262
1263 /* TODO checksum and real size for robustness */
1264 VLC_UNUSED(pi_samples);
1265 return 0;
1266 }
1267 static int ThdCheckSync( const uint8_t *p_peek, unsigned *pi_samples )
1268 {
1269 if( p_peek[4+0] != 0xf8 || p_peek[4+1] != 0x72 || p_peek[4+2] != 0x6f )
1270 return -1;
1271
1272 if( p_peek[4+3] != 0xba )
1273 return -1;
1274
1275 /* TODO checksum and real size for robustness */
1276 VLC_UNUSED(pi_samples);
1277 return 0;
1278 }
1279 static int MlpProbe( demux_t *p_demux, uint64_t *pi_offset )
1280 {
1281 const char *ppsz_name[] = { "mlp", NULL };
1282 const uint16_t rgi_twocc[] = { WAVE_FORMAT_PCM, WAVE_FORMAT_UNKNOWN };
1283
1284 return GenericProbe( p_demux, pi_offset, ppsz_name, MlpCheckSync,
1285 4+28+16*4, BASE_PROBE_SIZE, WAV_EXTRA_PROBE_SIZE,
1286 false, rgi_twocc, GenericFormatCheck );
1287 }
1288 static int ThdProbe( demux_t *p_demux, uint64_t *pi_offset )
1289 {
1290 const char *ppsz_name[] = { "thd", NULL };
1291 const uint16_t rgi_twocc[] = { WAVE_FORMAT_PCM, WAVE_FORMAT_UNKNOWN };
1292
1293 return GenericProbe( p_demux, pi_offset, ppsz_name, ThdCheckSync,
1294 4+28+16*4, BASE_PROBE_SIZE, WAV_EXTRA_PROBE_SIZE,
1295 false, rgi_twocc, GenericFormatCheck );
1296 }
1297 static int MlpInit( demux_t *p_demux )
1298
1299 {
1300 demux_sys_t *p_sys = p_demux->p_sys;
1301
1302 p_sys->i_packet_size = 4096;
1303
1304 return VLC_SUCCESS;
1305 }
1306
1307 /*****************************************************************************
1308 * Video
1309 *****************************************************************************/
1310 static int VideoInit( demux_t *p_demux )
1311 {
1312 demux_sys_t *p_sys = p_demux->p_sys;
1313
1314 p_sys->i_packet_size = 4096;
1315
1316 return VLC_SUCCESS;
1317 }
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