git.sesse.net Git - vlc/blob - modules/demux/mpeg/es.c

   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 "../../codec/a52.h"
  41 #include "../../codec/dts_header.h"
  42
  43 /*****************************************************************************
  44  * Module descriptor
  45  *****************************************************************************/
  46 static int  OpenAudio( vlc_object_t * );
  47 static int  OpenVideo( vlc_object_t * );
  48 static void Close    ( vlc_object_t * );
  49
  50 #define FPS_TEXT N_("Frames per Second")
  51 #define FPS_LONGTEXT N_("This is the frame rate used as a fallback when " \
  52     "playing MPEG video elementary streams.")
  53
  54 vlc_module_begin ()
  55     set_category( CAT_INPUT )
  56     set_subcategory( SUBCAT_INPUT_DEMUX )
  57     set_description( N_("MPEG-I/II/4 / A52 / DTS / MLP audio" ) )
  58     set_shortname( N_("Audio ES") )
  59     set_capability( "demux", 155 )
  60     set_callbacks( OpenAudio, Close )
  61
  62     add_shortcut( "mpga", "mp3",
  63                   "m4a", "mp4a", "aac",
  64                   "ac3", "a52",
  65                   "eac3",
  66                   "dts",
  67                   "mlp", "thd" )
  68
  69     add_submodule()
  70     set_description( N_("MPEG-4 video" ) )
  71     set_capability( "demux", 0 )
  72     set_callbacks( OpenVideo, Close )
  73     add_float( "es-fps", 25, FPS_TEXT, FPS_LONGTEXT, false )
  74
  75     add_shortcut( "m4v" )
  76     add_shortcut( "mp4v" )
  77 vlc_module_end ()
  78
  79 /*****************************************************************************
  80  * Local prototypes
  81  *****************************************************************************/
  82 static int Demux  ( demux_t * );
  83 static int Control( demux_t *, int, va_list );
  84
  85 typedef struct
  86 {
  87     vlc_fourcc_t i_codec;
  88     bool       b_use_word;
  89     const char *psz_name;
  90     int  (*pf_probe)( demux_t *p_demux, int64_t *pi_offset );
  91     int  (*pf_init)( demux_t *p_demux );
  92 } codec_t;
  93
  94 struct demux_sys_t
  95 {
  96     codec_t codec;
  97
  98     es_out_id_t *p_es;
  99
 100     bool  b_start;
 101     decoder_t   *p_packetizer;
 102     block_t     *p_packetized_data;
 103
 104     mtime_t     i_pts;
 105     mtime_t     i_time_offset;
 106     int64_t     i_bytes;
 107
 108     bool        b_big_endian;
 109     bool        b_estimate_bitrate;
 110     int         i_bitrate_avg;  /* extracted from Xing header */
 111
 112     bool b_initial_sync_failed;
 113
 114     int i_packet_size;
 115
 116     int64_t i_stream_offset;
 117
 118     float   f_fps;
 119
 120     /* Mpga specific */
 121     struct
 122     {
 123         int i_frames;
 124         int i_bytes;
 125         int i_bitrate_avg;
 126         int i_frame_samples;
 127     } xing;
 128 };
 129
 130 static int MpgaProbe( demux_t *p_demux, int64_t *pi_offset );
 131 static int MpgaInit( demux_t *p_demux );
 132
 133 static int AacProbe( demux_t *p_demux, int64_t *pi_offset );
 134 static int AacInit( demux_t *p_demux );
 135
 136 static int EA52Probe( demux_t *p_demux, int64_t *pi_offset );
 137 static int A52Probe( demux_t *p_demux, int64_t *pi_offset );
 138 static int A52Init( demux_t *p_demux );
 139
 140 static int DtsProbe( demux_t *p_demux, int64_t *pi_offset );
 141 static int DtsInit( demux_t *p_demux );
 142
 143 static int MlpProbe( demux_t *p_demux, int64_t *pi_offset );
 144 static int ThdProbe( demux_t *p_demux, int64_t *pi_offset );
 145 static int MlpInit( demux_t *p_demux );
 146
 147 static bool Parse( demux_t *p_demux, block_t **pp_output );
 148
 149 static const codec_t p_codecs[] = {
 150     { VLC_CODEC_MP4A, false, "mp4 audio",  AacProbe,  AacInit },
 151     { VLC_CODEC_MPGA, false, "mpeg audio", MpgaProbe, MpgaInit },
 152     { VLC_CODEC_A52, true,  "a52 audio",  A52Probe,  A52Init },
 153     { VLC_CODEC_EAC3, true,  "eac3 audio", EA52Probe, A52Init },
 154     { VLC_CODEC_DTS, false, "dts audio",  DtsProbe,  DtsInit },
 155     { VLC_CODEC_MLP, false, "mlp audio",  MlpProbe,  MlpInit },
 156     { VLC_CODEC_TRUEHD, false, "TrueHD audio",  ThdProbe,  MlpInit },
 157
 158     { 0, false, NULL, NULL, NULL }
 159 };
 160
 161 static int VideoInit( demux_t *p_demux );
 162
 163 static const codec_t codec_m4v = {
 164     VLC_CODEC_MP4V, false, "mp4 video", NULL,  VideoInit
 165 };
 166
 167 /*****************************************************************************
 168  * OpenCommon: initializes demux structures
 169  *****************************************************************************/
 170 static int OpenCommon( demux_t *p_demux,
 171                        int i_cat, const codec_t *p_codec, int64_t i_bs_offset )
 172 {
 173     demux_sys_t *p_sys;
 174
 175     es_format_t fmt;
 176
 177     DEMUX_INIT_COMMON(); p_sys = p_demux->p_sys;
 178     memset( p_sys, 0, sizeof( demux_sys_t ) );
 179     p_sys->codec = *p_codec;
 180     p_sys->p_es = NULL;
 181     p_sys->b_start = true;
 182     p_sys->i_stream_offset = i_bs_offset;
 183     p_sys->b_estimate_bitrate = true;
 184     p_sys->i_bitrate_avg = 0;
 185     p_sys->b_big_endian = false;
 186     p_sys->f_fps = var_InheritFloat( p_demux, "es-fps" );
 187     p_sys->p_packetized_data = NULL;
 188
 189     if( stream_Seek( p_demux->s, p_sys->i_stream_offset ) )
 190     {
 191         free( p_sys );
 192         return VLC_EGENERIC;
 193     }
 194
 195     if( p_sys->codec.pf_init( p_demux ) )
 196     {
 197         free( p_sys );
 198         return VLC_EGENERIC;
 199     }
 200
 201     msg_Dbg( p_demux, "detected format %4.4s", (const char*)&p_sys->codec.i_codec );
 202
 203     /* Load the audio packetizer */
 204     es_format_Init( &fmt, i_cat, p_sys->codec.i_codec );
 205     p_sys->p_packetizer = demux_PacketizerNew( p_demux, &fmt, p_sys->codec.psz_name );
 206     if( !p_sys->p_packetizer )
 207     {
 208         free( p_sys );
 209         return VLC_EGENERIC;
 210     }
 211
 212     while( vlc_object_alive( p_demux ) )
 213     {
 214         if( Parse( p_demux, &p_sys->p_packetized_data ) )
 215             break;
 216         if( p_sys->p_packetized_data )
 217             break;
 218     }
 219     return VLC_SUCCESS;
 220 }
 221 static int OpenAudio( vlc_object_t *p_this )
 222 {
 223     demux_t *p_demux = (demux_t*)p_this;
 224     for( int i = 0; p_codecs[i].i_codec != 0; i++ )
 225     {
 226         int64_t i_offset;
 227         if( !p_codecs[i].pf_probe( p_demux, &i_offset ) )
 228             return OpenCommon( p_demux, AUDIO_ES, &p_codecs[i], i_offset );
 229     }
 230     return VLC_EGENERIC;
 231 }
 232 static int OpenVideo( vlc_object_t *p_this )
 233 {
 234     demux_t *p_demux = (demux_t*)p_this;
 235
 236     /* Only m4v is supported for the moment */
 237     bool b_m4v_ext    = demux_IsPathExtension( p_demux, ".m4v" );
 238     bool b_m4v_forced = demux_IsForced( p_demux, "m4v" ) ||
 239                         demux_IsForced( p_demux, "mp4v" );
 240     if( !b_m4v_ext && !b_m4v_forced )
 241         return VLC_EGENERIC;
 242
 243     const uint8_t *p_peek;
 244     if( stream_Peek( p_demux->s, &p_peek, 4 ) < 4 )
 245         return VLC_EGENERIC;
 246     if( p_peek[0] != 0x00 || p_peek[1] != 0x00 || p_peek[2] != 0x01 )
 247     {
 248         if( !b_m4v_forced)
 249             return VLC_EGENERIC;
 250         msg_Warn( p_demux,
 251                   "this doesn't look like an MPEG ES stream, continuing anyway" );
 252     }
 253     return OpenCommon( p_demux, VIDEO_ES, &codec_m4v, 0 );
 254 }
 255 /*****************************************************************************
 256  * Demux: reads and demuxes data packets
 257  *****************************************************************************
 258  * Returns -1 in case of error, 0 in case of EOF, 1 otherwise
 259  *****************************************************************************/
 260 static int Demux( demux_t *p_demux )
 261 {
 262     int ret = 1;
 263     demux_sys_t *p_sys = p_demux->p_sys;
 264
 265     block_t *p_block_out = p_sys->p_packetized_data;
 266     if( p_block_out )
 267         p_sys->p_packetized_data = NULL;
 268     else
 269         ret = Parse( p_demux, &p_block_out ) ? 0 : 1;
 270
 271     while( p_block_out )
 272     {
 273         block_t *p_next = p_block_out->p_next;
 274
 275         /* Correct timestamp */
 276         if( p_sys->p_packetizer->fmt_out.i_cat == VIDEO_ES )
 277         {
 278             if( p_block_out->i_pts <= VLC_TS_INVALID &&
 279                 p_block_out->i_dts <= VLC_TS_INVALID )
 280                 p_block_out->i_dts = VLC_TS_0 + p_sys->i_pts + 1000000 / p_sys->f_fps;
 281             if( p_block_out->i_dts > VLC_TS_INVALID )
 282                 p_sys->i_pts = p_block_out->i_dts - VLC_TS_0;
 283         }
 284         else
 285         {
 286             p_sys->i_pts = p_block_out->i_pts - VLC_TS_0;
 287         }
 288
 289         if( p_block_out->i_pts > VLC_TS_INVALID )
 290         {
 291             p_block_out->i_pts += p_sys->i_time_offset;
 292         }
 293         if( p_block_out->i_dts > VLC_TS_INVALID )
 294         {
 295             p_block_out->i_dts += p_sys->i_time_offset;
 296             es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_block_out->i_dts );
 297         }
 298         /* Re-estimate bitrate */
 299         if( p_sys->b_estimate_bitrate && p_sys->i_pts > INT64_C(500000) )
 300             p_sys->i_bitrate_avg = 8*INT64_C(1000000)*p_sys->i_bytes/(p_sys->i_pts-1);
 301         p_sys->i_bytes += p_block_out->i_buffer;
 302
 303
 304         p_block_out->p_next = NULL;
 305         es_out_Send( p_demux->out, p_sys->p_es, p_block_out );
 306
 307         p_block_out = p_next;
 308     }
 309     return ret;
 310 }
 311
 312 /*****************************************************************************
 313  * Close: frees unused data
 314  *****************************************************************************/
 315 static void Close( vlc_object_t * p_this )
 316 {
 317     demux_t     *p_demux = (demux_t*)p_this;
 318     demux_sys_t *p_sys = p_demux->p_sys;
 319
 320     if( p_sys->p_packetized_data )
 321         block_ChainRelease( p_sys->p_packetized_data );
 322     demux_PacketizerDestroy( p_sys->p_packetizer );
 323     free( p_sys );
 324 }
 325
 326 /*****************************************************************************
 327  * Control:
 328  *****************************************************************************/
 329 static int Control( demux_t *p_demux, int i_query, va_list args )
 330 {
 331     demux_sys_t *p_sys  = p_demux->p_sys;
 332     int64_t *pi64;
 333     bool *pb_bool;
 334     int i_ret;
 335
 336     switch( i_query )
 337     {
 338         case DEMUX_HAS_UNSUPPORTED_META:
 339             pb_bool = (bool*)va_arg( args, bool* );
 340             *pb_bool = true;
 341             return VLC_SUCCESS;
 342
 343         case DEMUX_GET_TIME:
 344             pi64 = (int64_t*)va_arg( args, int64_t * );
 345             *pi64 = p_sys->i_pts + p_sys->i_time_offset;
 346             return VLC_SUCCESS;
 347
 348         case DEMUX_GET_LENGTH:
 349         {
 350             va_list ap;
 351
 352             va_copy ( ap, args );
 353             i_ret = demux_vaControlHelper( p_demux->s, p_sys->i_stream_offset,
 354                                     -1, p_sys->i_bitrate_avg, 1, i_query, ap );
 355             va_end( ap );
 356
 357             /* No bitrate, we can't have it precisely, but we can compute
 358              * a raw approximation with time/position */
 359             if( i_ret && !p_sys->i_bitrate_avg )
 360             {
 361                 float f_pos = (double)(uint64_t)( stream_Tell( p_demux->s ) ) /
 362                               (double)(uint64_t)( stream_Size( p_demux->s ) );
 363                 /* The first few seconds are guaranteed to be very whacky,
 364                  * don't bother trying ... Too bad */
 365                 if( f_pos < 0.01f ||
 366                     (p_sys->i_pts + p_sys->i_time_offset) < 8000000 )
 367                 {
 368                     return VLC_EGENERIC;
 369                 }
 370
 371                 pi64 = (int64_t *)va_arg( args, int64_t * );
 372                 *pi64 = (p_sys->i_pts + p_sys->i_time_offset) / f_pos;
 373                 return VLC_SUCCESS;
 374             }
 375             return i_ret;
 376         }
 377
 378         case DEMUX_SET_TIME:
 379             /* FIXME TODO: implement a high precision seek (with mp3 parsing)
 380              * needed for multi-input */
 381         default:
 382             i_ret = demux_vaControlHelper( p_demux->s, p_sys->i_stream_offset, -1,
 383                                             p_sys->i_bitrate_avg, 1, i_query,
 384                                             args );
 385             if( !i_ret && p_sys->i_bitrate_avg > 0 &&
 386                 (i_query == DEMUX_SET_POSITION || i_query == DEMUX_SET_TIME) )
 387             {
 388                 int64_t i_time = INT64_C(8000000) * ( stream_Tell(p_demux->s) - p_sys->i_stream_offset ) /
 389                     p_sys->i_bitrate_avg;
 390
 391                 /* Fix time_offset */
 392                 if( i_time >= 0 )
 393                     p_sys->i_time_offset = i_time - p_sys->i_pts;
 394                 /* And reset buffered data */
 395                 if( p_sys->p_packetized_data )
 396                     block_ChainRelease( p_sys->p_packetized_data );
 397                 p_sys->p_packetized_data = NULL;
 398             }
 399             return i_ret;
 400     }
 401 }
 402
 403 /*****************************************************************************
 404  * Makes a link list of buffer of parsed data
 405  * Returns true if EOF
 406  *****************************************************************************/
 407 static bool Parse( demux_t *p_demux, block_t **pp_output )
 408 {
 409     demux_sys_t *p_sys = p_demux->p_sys;
 410     block_t *p_block_in, *p_block_out;
 411
 412     *pp_output = NULL;
 413
 414     if( p_sys->codec.b_use_word )
 415     {
 416         /* Make sure we are word aligned */
 417         int64_t i_pos = stream_Tell( p_demux->s );
 418         if( i_pos % 2 )
 419             stream_Read( p_demux->s, NULL, 1 );
 420     }
 421
 422     p_block_in = stream_Block( p_demux->s, p_sys->i_packet_size );
 423     bool b_eof = p_block_in == NULL;
 424
 425     if( p_block_in )
 426     {
 427         if( p_sys->codec.b_use_word && !p_sys->b_big_endian && p_block_in->i_buffer > 0 )
 428         {
 429             /* Convert to big endian */
 430             swab( p_block_in->p_buffer, p_block_in->p_buffer, p_block_in->i_buffer );
 431         }
 432
 433         p_block_in->i_pts = p_block_in->i_dts = p_sys->b_start || p_sys->b_initial_sync_failed ? VLC_TS_0 : VLC_TS_INVALID;
 434     }
 435     p_sys->b_initial_sync_failed = p_sys->b_start; /* Only try to resync once */
 436
 437     while( ( p_block_out = p_sys->p_packetizer->pf_packetize( p_sys->p_packetizer, p_block_in ? &p_block_in : NULL ) ) )
 438     {
 439         p_sys->b_initial_sync_failed = false;
 440         while( p_block_out )
 441         {
 442             if( !p_sys->p_es )
 443             {
 444                 p_sys->p_packetizer->fmt_out.b_packetized = true;
 445                 p_sys->p_es = es_out_Add( p_demux->out,
 446                                           &p_sys->p_packetizer->fmt_out);
 447
 448
 449                 /* Try the xing header */
 450                 if( p_sys->xing.i_bytes && p_sys->xing.i_frames &&
 451                     p_sys->xing.i_frame_samples )
 452                 {
 453                     p_sys->i_bitrate_avg = p_sys->xing.i_bytes * INT64_C(8) *
 454                         p_sys->p_packetizer->fmt_out.audio.i_rate /
 455                         p_sys->xing.i_frames / p_sys->xing.i_frame_samples;
 456
 457                     if( p_sys->i_bitrate_avg > 0 )
 458                         p_sys->b_estimate_bitrate = false;
 459                 }
 460                 /* Use the bitrate as initual value */
 461                 if( p_sys->b_estimate_bitrate )
 462                     p_sys->i_bitrate_avg = p_sys->p_packetizer->fmt_out.i_bitrate;
 463             }
 464
 465             block_t *p_next = p_block_out->p_next;
 466             p_block_out->p_next = NULL;
 467
 468             block_ChainLastAppend( &pp_output, p_block_out );
 469
 470             p_block_out = p_next;
 471         }
 472     }
 473
 474     if( p_sys->b_initial_sync_failed )
 475         msg_Dbg( p_demux, "did not sync on first block" );
 476     p_sys->b_start = false;
 477
 478     return b_eof;
 479 }
 480
 481 /*****************************************************************************
 482  * Wav header skipper
 483  *****************************************************************************/
 484 #define WAV_PROBE_SIZE (512*1024)
 485 static int WavSkipHeader( demux_t *p_demux, int *pi_skip, const int pi_format[] )
 486 {
 487     const uint8_t *p_peek;
 488     int         i_peek = 0;
 489
 490     /* */
 491     *pi_skip = 0;
 492
 493     /* Check if we are dealing with a WAV file */
 494     if( stream_Peek( p_demux->s, &p_peek, 12+8 ) != 12 + 8 )
 495         return VLC_SUCCESS;
 496
 497     if( memcmp( p_peek, "RIFF", 4 ) || memcmp( &p_peek[8], "WAVE", 4 ) )
 498         return VLC_SUCCESS;
 499
 500     /* Find the wave format header */
 501     i_peek = 12 + 8;
 502     while( memcmp( p_peek + i_peek - 8, "fmt ", 4 ) )
 503     {
 504         uint32_t i_len = GetDWLE( p_peek + i_peek - 4 );
 505         if( i_len > WAV_PROBE_SIZE || i_peek + i_len > WAV_PROBE_SIZE )
 506             return VLC_EGENERIC;
 507
 508         i_peek += i_len + 8;
 509         if( stream_Peek( p_demux->s, &p_peek, i_peek ) != i_peek )
 510             return VLC_EGENERIC;
 511     }
 512
 513     /* Sanity check the wave format header */
 514     uint32_t i_len = GetDWLE( p_peek + i_peek - 4 );
 515     if( i_len > WAV_PROBE_SIZE )
 516         return VLC_EGENERIC;
 517
 518     i_peek += i_len + 8;
 519     if( stream_Peek( p_demux->s, &p_peek, i_peek ) != i_peek )
 520         return VLC_EGENERIC;
 521     const int i_format = GetWLE( p_peek + i_peek - i_len - 8 /* wFormatTag */ );
 522     int i_format_idx;
 523     for( i_format_idx = 0; pi_format[i_format_idx] != WAVE_FORMAT_UNKNOWN; i_format_idx++ )
 524     {
 525         if( i_format == pi_format[i_format_idx] )
 526             break;
 527     }
 528     if( pi_format[i_format_idx] == WAVE_FORMAT_UNKNOWN )
 529         return VLC_EGENERIC;
 530
 531     if( i_format == WAVE_FORMAT_PCM )
 532     {
 533         if( GetWLE( p_peek + i_peek - i_len - 6 /* nChannels */ ) != 2 )
 534             return VLC_EGENERIC;
 535         if( GetDWLE( p_peek + i_peek - i_len - 4 /* nSamplesPerSec */ ) !=
 536             44100 )
 537             return VLC_EGENERIC;
 538     }
 539
 540     /* Skip the wave header */
 541     while( memcmp( p_peek + i_peek - 8, "data", 4 ) )
 542     {
 543         uint32_t i_len = GetDWLE( p_peek + i_peek - 4 );
 544         if( i_len > WAV_PROBE_SIZE || i_peek + i_len > WAV_PROBE_SIZE )
 545             return VLC_EGENERIC;
 546
 547         i_peek += i_len + 8;
 548         if( stream_Peek( p_demux->s, &p_peek, i_peek ) != i_peek )
 549             return VLC_EGENERIC;
 550     }
 551     *pi_skip = i_peek;
 552     return VLC_SUCCESS;
 553 }
 554
 555 static int GenericProbe( demux_t *p_demux, int64_t *pi_offset,
 556                          const char * ppsz_name[],
 557                          int (*pf_check)( const uint8_t *, int * ), int i_check_size,
 558                          const int pi_wav_format[] )
 559 {
 560     bool   b_forced_demux;
 561
 562     int64_t i_offset;
 563     const uint8_t *p_peek;
 564     int i_skip;
 565
 566     b_forced_demux = false;
 567     for( int i = 0; ppsz_name[i] != NULL; i++ )
 568     {
 569         b_forced_demux |= demux_IsForced( p_demux, ppsz_name[i] );
 570     }
 571
 572     i_offset = stream_Tell( p_demux->s );
 573
 574     if( WavSkipHeader( p_demux, &i_skip, pi_wav_format ) )
 575     {
 576         if( !b_forced_demux )
 577             return VLC_EGENERIC;
 578     }
 579     const bool b_wav = i_skip > 0;
 580
 581     /* peek the begining
 582      * It is common that wav files have some sort of garbage at the begining
 583      * We will accept probing 0.5s of data in this case.
 584      */
 585     const int i_probe = i_skip + i_check_size + 8000 + ( b_wav ? (44000/2*2*2) : 0);
 586     const int i_peek = stream_Peek( p_demux->s, &p_peek, i_probe );
 587     if( i_peek < i_skip + i_check_size )
 588     {
 589         msg_Err( p_demux, "cannot peek" );
 590         return VLC_EGENERIC;
 591     }
 592     for( ;; )
 593     {
 594         if( i_skip + i_check_size > i_peek )
 595         {
 596             if( !b_forced_demux )
 597                 return VLC_EGENERIC;
 598             break;
 599         }
 600         int i_samples = 0;
 601         int i_size = pf_check( &p_peek[i_skip], &i_samples );
 602         if( i_size >= 0 )
 603         {
 604             if( i_size == 0 )
 605                 break;
 606
 607             /* If we have the frame size, check the next frame for
 608              * extra robustness
 609              * The second test is because some .wav have paddings
 610              */
 611             bool b_ok = false;
 612             for( int t = 0; t < 1 + !!b_wav; t++ )
 613             {
 614                 if( t == 1 )
 615                     i_size = i_samples * 2 * 2;
 616                 if( i_skip + i_check_size + i_size <= i_peek )
 617                 {
 618                     b_ok = pf_check( &p_peek[i_skip+i_size], NULL ) >= 0;
 619                     if( b_ok )
 620                         break;
 621                 }
 622             }
 623             if( b_ok )
 624                 break;
 625         }
 626         i_skip++;
 627         if( !b_wav && !b_forced_demux )
 628             return VLC_EGENERIC;
 629     }
 630
 631     *pi_offset = i_offset + i_skip;
 632     return VLC_SUCCESS;
 633 }
 634
 635 /*****************************************************************************
 636  * Mpeg I/II Audio
 637  *****************************************************************************/
 638 static int MpgaCheckSync( const uint8_t *p_peek )
 639 {
 640     uint32_t h = GetDWBE( p_peek );
 641
 642     if( ((( h >> 21 )&0x07FF) != 0x07FF )   /* header sync */
 643         || (((h >> 19)&0x03) == 1 )         /* valid version ID ? */
 644         || (((h >> 17)&0x03) == 0 )         /* valid layer ?*/
 645         || (((h >> 12)&0x0F) == 0x0F )      /* valid bitrate ?*/
 646         || (((h >> 10) & 0x03) == 0x03 )    /* valide sampling freq ? */
 647         || ((h & 0x03) == 0x02 ))           /* valid emphasis ? */
 648     {
 649         return false;
 650     }
 651     return true;
 652 }
 653
 654 #define MPGA_VERSION( h )   ( 1 - (((h)>>19)&0x01) )
 655 #define MPGA_MODE(h)        (((h)>> 6)&0x03)
 656
 657 static int MpgaGetFrameSamples( uint32_t h )
 658 {
 659     const int i_layer = 3 - (((h)>>17)&0x03);
 660     switch( i_layer )
 661     {
 662     case 0:
 663         return 384;
 664     case 1:
 665         return 1152;
 666     case 2:
 667         return MPGA_VERSION(h) ? 576 : 1152;
 668     default:
 669         return 0;
 670     }
 671 }
 672
 673 static int MpgaProbe( demux_t *p_demux, int64_t *pi_offset )
 674 {
 675     const int pi_wav[] = { WAVE_FORMAT_MPEG, WAVE_FORMAT_MPEGLAYER3, WAVE_FORMAT_UNKNOWN };
 676     bool   b_forced;
 677     bool   b_forced_demux;
 678     int64_t i_offset;
 679
 680     const uint8_t *p_peek;
 681     int i_skip;
 682
 683     b_forced = demux_IsPathExtension( p_demux, ".mp3" );
 684     b_forced_demux = demux_IsForced( p_demux, "mp3" ) ||
 685                      demux_IsForced( p_demux, "mpga" );
 686
 687     i_offset = stream_Tell( p_demux->s );
 688
 689     if( WavSkipHeader( p_demux, &i_skip, pi_wav ) )
 690     {
 691         if( !b_forced_demux )
 692             return VLC_EGENERIC;
 693
 694         return VLC_EGENERIC;
 695     }
 696
 697     if( stream_Peek( p_demux->s, &p_peek, i_skip + 4 ) < i_skip + 4 )
 698         return VLC_EGENERIC;
 699
 700     if( !MpgaCheckSync( &p_peek[i_skip] ) )
 701     {
 702         bool b_ok = false;
 703         int i_peek;
 704
 705         if( !b_forced_demux && !b_forced )
 706             return VLC_EGENERIC;
 707
 708         i_peek = stream_Peek( p_demux->s, &p_peek, i_skip + 8096 );
 709         while( i_skip + 4 < i_peek )
 710         {
 711             if( MpgaCheckSync( &p_peek[i_skip] ) )
 712             {
 713                 b_ok = true;
 714                 break;
 715             }
 716             i_skip++;
 717         }
 718         if( !b_ok && !b_forced_demux )
 719             return VLC_EGENERIC;
 720     }
 721     *pi_offset = i_offset + i_skip;
 722     return VLC_SUCCESS;
 723 }
 724
 725 static void MpgaXingSkip( const uint8_t **pp_xing, int *pi_xing, int i_count )
 726 {
 727     if(i_count > *pi_xing )
 728         i_count = *pi_xing;
 729
 730     (*pp_xing) += i_count;
 731     (*pi_xing) -= i_count;
 732 }
 733
 734 static uint32_t MpgaXingGetDWBE( const uint8_t **pp_xing, int *pi_xing, uint32_t i_default )
 735 {
 736     if( *pi_xing < 4 )
 737         return i_default;
 738
 739     uint32_t v = GetDWBE( *pp_xing );
 740
 741     MpgaXingSkip( pp_xing, pi_xing, 4 );
 742
 743     return v;
 744 }
 745
 746 static int MpgaInit( demux_t *p_demux )
 747 {
 748     demux_sys_t *p_sys = p_demux->p_sys;
 749
 750     const uint8_t *p_peek;
 751     int i_peek;
 752
 753     /* */
 754     p_sys->i_packet_size = 1024;
 755
 756     /* Load a potential xing header */
 757     i_peek = stream_Peek( p_demux->s, &p_peek, 4 + 1024 );
 758     if( i_peek < 4 + 21 )
 759         return VLC_SUCCESS;
 760
 761     const uint32_t header = GetDWBE( p_peek );
 762     if( !MpgaCheckSync( p_peek ) )
 763         return VLC_SUCCESS;
 764
 765     /* Xing header */
 766     const uint8_t *p_xing = p_peek;
 767     int i_xing = i_peek;
 768     int i_skip;
 769
 770     if( MPGA_VERSION( header ) == 0 )
 771         i_skip = MPGA_MODE( header ) != 3 ? 36 : 21;
 772     else
 773         i_skip = MPGA_MODE( header ) != 3 ? 21 : 13;
 774
 775     if( i_skip + 8 >= i_xing || memcmp( &p_xing[i_skip], "Xing", 4 ) )
 776         return VLC_SUCCESS;
 777
 778     const uint32_t i_flags = GetDWBE( &p_xing[i_skip+4] );
 779
 780     MpgaXingSkip( &p_xing, &i_xing, i_skip + 8 );
 781
 782     if( i_flags&0x01 )
 783         p_sys->xing.i_frames = MpgaXingGetDWBE( &p_xing, &i_xing, 0 );
 784     if( i_flags&0x02 )
 785         p_sys->xing.i_bytes = MpgaXingGetDWBE( &p_xing, &i_xing, 0 );
 786     if( i_flags&0x04 ) /* TODO Support XING TOC to improve seeking accuracy */
 787         MpgaXingSkip( &p_xing, &i_xing, 100 );
 788     if( i_flags&0x08 )
 789     {
 790         /* FIXME: doesn't return the right bitrage average, at least
 791            with some MP3's */
 792         p_sys->xing.i_bitrate_avg = MpgaXingGetDWBE( &p_xing, &i_xing, 0 );
 793         msg_Dbg( p_demux, "xing vbr value present (%d)",
 794                  p_sys->xing.i_bitrate_avg );
 795     }
 796
 797     if( p_sys->xing.i_frames > 0 && p_sys->xing.i_bytes > 0 )
 798     {
 799         p_sys->xing.i_frame_samples = MpgaGetFrameSamples( header );
 800         msg_Dbg( p_demux, "xing frames&bytes value present "
 801                  "(%d bytes, %d frames, %d samples/frame)",
 802                  p_sys->xing.i_bytes, p_sys->xing.i_frames,
 803                  p_sys->xing.i_frame_samples );
 804     }
 805     return VLC_SUCCESS;
 806 }
 807
 808 /*****************************************************************************
 809  * AAC
 810  *****************************************************************************/
 811 static int AacProbe( demux_t *p_demux, int64_t *pi_offset )
 812 {
 813     bool   b_forced;
 814     bool   b_forced_demux;
 815
 816     int64_t i_offset;
 817     const uint8_t *p_peek;
 818
 819     b_forced = demux_IsPathExtension( p_demux, ".aac" ) ||
 820                demux_IsPathExtension( p_demux, ".aacp" );
 821     b_forced_demux = demux_IsForced( p_demux, "m4a" ) ||
 822                      demux_IsForced( p_demux, "aac" ) ||
 823                      demux_IsForced( p_demux, "mp4a" );
 824
 825     if( !b_forced_demux && !b_forced )
 826         return VLC_EGENERIC;
 827
 828     i_offset = stream_Tell( p_demux->s );
 829
 830     /* peek the begining (10 is for adts header) */
 831     if( stream_Peek( p_demux->s, &p_peek, 10 ) < 10 )
 832     {
 833         msg_Err( p_demux, "cannot peek" );
 834         return VLC_EGENERIC;
 835     }
 836     if( !strncmp( (char *)p_peek, "ADIF", 4 ) )
 837     {
 838         msg_Err( p_demux, "ADIF file. Not yet supported. (Please report)" );
 839         return VLC_EGENERIC;
 840     }
 841
 842     *pi_offset = i_offset;
 843     return VLC_SUCCESS;
 844 }
 845 static int AacInit( demux_t *p_demux )
 846 {
 847     demux_sys_t *p_sys = p_demux->p_sys;
 848
 849     p_sys->i_packet_size = 4096;
 850
 851     return VLC_SUCCESS;
 852 }
 853
 854
 855 /*****************************************************************************
 856  * A52
 857  *****************************************************************************/
 858 static int A52CheckSync( const uint8_t *p_peek, bool *p_big_endian, int *pi_samples, bool b_eac3 )
 859 {
 860     vlc_a52_header_t header;
 861     uint8_t p_tmp[VLC_A52_HEADER_SIZE];
 862
 863     *p_big_endian =  p_peek[0] == 0x0b && p_peek[1] == 0x77;
 864     if( !*p_big_endian )
 865     {
 866         swab( p_peek, p_tmp, VLC_A52_HEADER_SIZE );
 867         p_peek = p_tmp;
 868     }
 869
 870     if( vlc_a52_header_Parse( &header, p_peek, VLC_A52_HEADER_SIZE ) )
 871         return VLC_EGENERIC;
 872
 873     if( !header.b_eac3 != !b_eac3 )
 874         return VLC_EGENERIC;
 875     if( pi_samples )
 876         *pi_samples = header.i_samples;
 877     return header.i_size;
 878 }
 879 static int EA52CheckSyncProbe( const uint8_t *p_peek, int *pi_samples )
 880 {
 881     bool b_dummy;
 882     return A52CheckSync( p_peek, &b_dummy, pi_samples, true );
 883 }
 884
 885 static int EA52Probe( demux_t *p_demux, int64_t *pi_offset )
 886 {
 887     const char *ppsz_name[] = { "eac3", NULL };
 888     const int pi_wav[] = { WAVE_FORMAT_PCM, WAVE_FORMAT_A52, WAVE_FORMAT_UNKNOWN };
 889
 890     return GenericProbe( p_demux, pi_offset, ppsz_name, EA52CheckSyncProbe, VLC_A52_HEADER_SIZE, pi_wav );
 891 }
 892
 893 static int A52CheckSyncProbe( const uint8_t *p_peek, int *pi_samples )
 894 {
 895     bool b_dummy;
 896     return A52CheckSync( p_peek, &b_dummy, pi_samples, false );
 897 }
 898
 899 static int A52Probe( demux_t *p_demux, int64_t *pi_offset )
 900 {
 901     const char *ppsz_name[] = { "a52", "ac3", NULL };
 902     const int pi_wav[] = { WAVE_FORMAT_PCM, WAVE_FORMAT_A52, WAVE_FORMAT_UNKNOWN };
 903
 904     return GenericProbe( p_demux, pi_offset, ppsz_name, A52CheckSyncProbe, VLC_A52_HEADER_SIZE, pi_wav );
 905 }
 906
 907 static int A52Init( demux_t *p_demux )
 908 {
 909     demux_sys_t *p_sys = p_demux->p_sys;
 910
 911     p_sys->b_big_endian = false;
 912     p_sys->i_packet_size = 1024;
 913
 914     const uint8_t *p_peek;
 915
 916     /* peek the begining */
 917     if( stream_Peek( p_demux->s, &p_peek, VLC_A52_HEADER_SIZE ) >= VLC_A52_HEADER_SIZE )
 918     {
 919         A52CheckSync( p_peek, &p_sys->b_big_endian, NULL, true );
 920     }
 921     return VLC_SUCCESS;
 922 }
 923
 924 /*****************************************************************************
 925  * DTS
 926  *****************************************************************************/
 927 static int DtsCheckSync( const uint8_t *p_peek, int *pi_samples )
 928 {
 929     unsigned int i_sample_rate, i_bit_rate, i_frame_length, i_audio_mode;
 930     bool b_dts_hd;
 931
 932     VLC_UNUSED(pi_samples);
 933
 934     int i_frame_size = GetSyncInfo( p_peek,
 935                                     &b_dts_hd,
 936                                     &i_sample_rate,
 937                                     &i_bit_rate,
 938                                     &i_frame_length,
 939                                     &i_audio_mode );
 940
 941     if( i_frame_size != VLC_EGENERIC && i_frame_size <= 8192 )
 942         return VLC_SUCCESS;
 943     else
 944         return VLC_EGENERIC;
 945 }
 946
 947 static int DtsProbe( demux_t *p_demux, int64_t *pi_offset )
 948 {
 949     const char *ppsz_name[] = { "dts", NULL };
 950     const int pi_wav[] = { WAVE_FORMAT_PCM, WAVE_FORMAT_DTS, WAVE_FORMAT_UNKNOWN };
 951
 952     return GenericProbe( p_demux, pi_offset, ppsz_name, DtsCheckSync, 11, pi_wav );
 953 }
 954 static int DtsInit( demux_t *p_demux )
 955 {
 956     demux_sys_t *p_sys = p_demux->p_sys;
 957
 958     p_sys->i_packet_size = 16384;
 959
 960     return VLC_SUCCESS;
 961 }
 962
 963 /*****************************************************************************
 964  * MLP
 965  *****************************************************************************/
 966 static int MlpCheckSync( const uint8_t *p_peek, int *pi_samples )
 967 {
 968     if( p_peek[4+0] != 0xf8 || p_peek[4+1] != 0x72 || p_peek[4+2] != 0x6f )
 969         return -1;
 970
 971     if( p_peek[4+3] != 0xbb )
 972         return -1;
 973
 974     /* TODO checksum and real size for robustness */
 975     VLC_UNUSED(pi_samples);
 976     return 0;
 977 }
 978 static int ThdCheckSync( const uint8_t *p_peek, int *pi_samples )
 979 {
 980     if( p_peek[4+0] != 0xf8 || p_peek[4+1] != 0x72 || p_peek[4+2] != 0x6f )
 981         return -1;
 982
 983     if( p_peek[4+3] != 0xba )
 984         return -1;
 985
 986     /* TODO checksum and real size for robustness */
 987     VLC_UNUSED(pi_samples);
 988     return 0;
 989 }
 990 static int MlpProbe( demux_t *p_demux, int64_t *pi_offset )
 991 {
 992     const char *ppsz_name[] = { "mlp", NULL };
 993     const int pi_wav[] = { WAVE_FORMAT_PCM, WAVE_FORMAT_UNKNOWN };
 994
 995     return GenericProbe( p_demux, pi_offset, ppsz_name, MlpCheckSync, 4+28+16*4, pi_wav );
 996 }
 997 static int ThdProbe( demux_t *p_demux, int64_t *pi_offset )
 998 {
 999     const char *ppsz_name[] = { "thd", NULL };
1000     const int pi_wav[] = { WAVE_FORMAT_PCM, WAVE_FORMAT_UNKNOWN };
1001
1002     return GenericProbe( p_demux, pi_offset, ppsz_name, ThdCheckSync, 4+28+16*4, pi_wav );
1003 }
1004 static int MlpInit( demux_t *p_demux )
1005
1006 {
1007     demux_sys_t *p_sys = p_demux->p_sys;
1008
1009     p_sys->i_packet_size = 4096;
1010
1011     return VLC_SUCCESS;
1012 }
1013
1014 /*****************************************************************************
1015  * Video
1016  *****************************************************************************/
1017 static int VideoInit( demux_t *p_demux )
1018 {
1019     demux_sys_t *p_sys = p_demux->p_sys;
1020
1021     p_sys->i_packet_size = 4096;
1022
1023     return VLC_SUCCESS;
1024 }