dlls/quartz/mpegsplit.c

   1 /*
   2  * MPEG Splitter Filter
   3  *
   4  * Copyright 2003 Robert Shearman
   5  * Copyright 2004-2005 Christian Costa
   6  * Copyright 2007 Chris Robinson
   7  * Copyright 2008 Maarten Lankhorst
   8  *
   9  * This library is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU Lesser General Public
  11  * License as published by the Free Software Foundation; either
  12  * version 2.1 of the License, or (at your option) any later version.
  13  *
  14  * This library is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * Lesser General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public
  20  * License along with this library; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  22  */
  23
  24 #include <assert.h>
  25 #include <math.h>
  26
  27 #include "quartz_private.h"
  28 #include "control_private.h"
  29 #include "pin.h"
  30
  31 #include "uuids.h"
  32 #include "mmreg.h"
  33 #include "mmsystem.h"
  34
  35 #include "winternl.h"
  36
  37 #include "wine/unicode.h"
  38 #include "wine/debug.h"
  39
  40 #include "parser.h"
  41
  42 WINE_DEFAULT_DEBUG_CHANNEL(quartz);
  43
  44 #define SEQUENCE_HEADER_CODE     0xB3
  45 #define PACK_START_CODE          0xBA
  46
  47 #define SYSTEM_START_CODE        0xBB
  48 #define AUDIO_ELEMENTARY_STREAM  0xC0
  49 #define VIDEO_ELEMENTARY_STREAM  0xE0
  50
  51 #define MPEG_SYSTEM_HEADER 3
  52 #define MPEG_VIDEO_HEADER 2
  53 #define MPEG_AUDIO_HEADER 1
  54 #define MPEG_NO_HEADER 0
  55
  56 #define SEEK_INTERVAL (ULONGLONG)(10 * 10000000) /* Add an entry every 10 seconds */
  57
  58 struct seek_entry {
  59     ULONGLONG bytepos;
  60     ULONGLONG timepos;
  61 };
  62
  63 typedef struct MPEGSplitterImpl
  64 {
  65     ParserImpl Parser;
  66     LONGLONG EndOfFile;
  67     LONGLONG duration;
  68     LONGLONG position;
  69     DWORD begin_offset;
  70     BYTE header[4];
  71
  72     /* Whether we just seeked (or started playing) */
  73     BOOL seek;
  74
  75     /* Seeking cache */
  76     ULONG seek_entries;
  77     struct seek_entry *seektable;
  78 } MPEGSplitterImpl;
  79
  80 static int MPEGSplitter_head_check(const BYTE *header)
  81 {
  82     /* If this is a possible start code, check for a system or video header */
  83     if (header[0] == 0 && header[1] == 0 && header[2] == 1)
  84     {
  85         /* Check if we got a system or elementary stream start code */
  86         if (header[3] == PACK_START_CODE ||
  87             header[3] == VIDEO_ELEMENTARY_STREAM ||
  88             header[3] == AUDIO_ELEMENTARY_STREAM)
  89             return MPEG_SYSTEM_HEADER;
  90
  91         /* Check for a MPEG video sequence start code */
  92         if (header[3] == SEQUENCE_HEADER_CODE)
  93             return MPEG_VIDEO_HEADER;
  94     }
  95
  96     /* This should give a good guess if we have an MPEG audio header */
  97     if(header[0] == 0xff && ((header[1]>>5)&0x7) == 0x7 &&
  98        ((header[1]>>1)&0x3) != 0 && ((header[2]>>4)&0xf) != 0xf &&
  99        ((header[2]>>2)&0x3) != 0x3)
 100         return MPEG_AUDIO_HEADER;
 101
 102     /* Nothing yet.. */
 103     return MPEG_NO_HEADER;
 104 }
 105
 106 static const WCHAR wszAudioStream[] = {'A','u','d','i','o',0};
 107 static const WCHAR wszVideoStream[] = {'V','i','d','e','o',0};
 108
 109 static const DWORD freqs[10] = { 44100, 48000, 32000, 22050, 24000, 16000, 11025, 12000,  8000, 0 };
 110
 111 static const DWORD tabsel_123[2][3][16] = {
 112     { {0,32,64,96,128,160,192,224,256,288,320,352,384,416,448,},
 113       {0,32,48,56, 64, 80, 96,112,128,160,192,224,256,320,384,},
 114       {0,32,40,48, 56, 64, 80, 96,112,128,160,192,224,256,320,} },
 115
 116     { {0,32,48,56,64,80,96,112,128,144,160,176,192,224,256,},
 117       {0,8,16,24,32,40,48,56,64,80,96,112,128,144,160,},
 118       {0,8,16,24,32,40,48,56,64,80,96,112,128,144,160,} }
 119 };
 120
 121 static HRESULT parse_header(BYTE *header, LONGLONG *plen, LONGLONG *pduration)
 122 {
 123     LONGLONG duration;
 124
 125     int bitrate_index, freq_index, lsf = 1, mpeg1, layer, padding, bitrate, length;
 126
 127     if (!(header[0] == 0xff && ((header[1]>>5)&0x7) == 0x7 &&
 128        ((header[1]>>1)&0x3) != 0 && ((header[2]>>4)&0xf) != 0xf &&
 129        ((header[2]>>2)&0x3) != 0x3))
 130     {
 131         FIXME("Not a valid header: %02x:%02x\n", header[0], header[1]);
 132         return E_INVALIDARG;
 133     }
 134
 135     mpeg1 = (header[1]>>4)&0x1;
 136     if (mpeg1)
 137         lsf = ((header[1]>>3)&0x1)^1;
 138
 139     layer = 4-((header[1]>>1)&0x3);
 140     bitrate_index = ((header[2]>>4)&0xf);
 141     freq_index = ((header[2]>>2)&0x3) + (mpeg1?(lsf*3):6);
 142     padding = ((header[2]>>1)&0x1);
 143
 144     bitrate = tabsel_123[lsf][layer-1][bitrate_index] * 1000;
 145     if (!bitrate || layer != 3)
 146     {
 147         FIXME("Not a valid header: %02x:%02x:%02x:%02x\n", header[0], header[1], header[2], header[3]);
 148         return E_INVALIDARG;
 149     }
 150
 151
 152     if (layer == 3 || layer == 2)
 153         length = 144 * bitrate / freqs[freq_index] + padding;
 154     else
 155         length = 4 * (12 * bitrate / freqs[freq_index] + padding);
 156
 157     duration = (ULONGLONG)10000000 * (ULONGLONG)(length) / (ULONGLONG)(bitrate/8);
 158     *plen = length;
 159     if (pduration)
 160         *pduration += duration;
 161     return S_OK;
 162 }
 163
 164 static HRESULT FillBuffer(MPEGSplitterImpl *This, IMediaSample *pCurrentSample)
 165 {
 166     Parser_OutputPin * pOutputPin = (Parser_OutputPin*)This->Parser.ppPins[1];
 167     LONGLONG length = 0;
 168     LONGLONG pos = BYTES_FROM_MEDIATIME(This->Parser.pInputPin->rtNext);
 169     LONGLONG time = This->position;
 170     HRESULT hr;
 171     BYTE *fbuf = NULL;
 172     DWORD len = IMediaSample_GetActualDataLength(pCurrentSample);
 173
 174     TRACE("Source length: %u\n", len);
 175     IMediaSample_GetPointer(pCurrentSample, &fbuf);
 176
 177     /* Find the next valid header.. it <SHOULD> be right here */
 178     assert(parse_header(fbuf, &length, &This->position) == S_OK);
 179     assert(length == len || length + 4 == len);
 180     IMediaSample_SetActualDataLength(pCurrentSample, length);
 181
 182     /* Queue the next sample */
 183     if (length + 4 == len)
 184     {
 185         PullPin *pin = This->Parser.pInputPin;
 186         LONGLONG stop = BYTES_FROM_MEDIATIME(pin->rtStop);
 187
 188         hr = S_OK;
 189         memcpy(This->header, fbuf + length, 4);
 190         while (FAILED(hr = parse_header(This->header, &length, NULL)))
 191         {
 192             memmove(This->header, This->header+1, 3);
 193             if (pos + 4 >= stop)
 194                 break;
 195             IAsyncReader_SyncRead(pin->pReader, ++pos, 1, This->header + 3);
 196         }
 197         pin->rtNext = MEDIATIME_FROM_BYTES(pos);
 198
 199         if (SUCCEEDED(hr))
 200         {
 201             /* Remove 4 for the last header, which should hopefully work */
 202             IMediaSample *sample = NULL;
 203             LONGLONG rtSampleStart = pin->rtNext - MEDIATIME_FROM_BYTES(4);
 204             LONGLONG rtSampleStop = rtSampleStart + MEDIATIME_FROM_BYTES(length + 4);
 205
 206             hr = IMemAllocator_GetBuffer(pin->pAlloc, &sample, NULL, NULL, 0);
 207
 208             if (rtSampleStop > pin->rtStop)
 209                 rtSampleStop = MEDIATIME_FROM_BYTES(ALIGNUP(BYTES_FROM_MEDIATIME(pin->rtStop), pin->cbAlign));
 210
 211             IMediaSample_SetTime(sample, &rtSampleStart, &rtSampleStop);
 212             IMediaSample_SetPreroll(sample, 0);
 213             IMediaSample_SetDiscontinuity(sample, 0);
 214             IMediaSample_SetSyncPoint(sample, 1);
 215             pin->rtCurrent = rtSampleStart;
 216             pin->rtNext = rtSampleStop;
 217
 218             if (SUCCEEDED(hr))
 219                 hr = IAsyncReader_Request(pin->pReader, sample, 0);
 220             if (FAILED(hr))
 221                 FIXME("o_Ox%08x\n", hr);
 222         }
 223     }
 224     /* If not, we're presumably at the end of file */
 225
 226     TRACE("Media time : %u.%03u\n", (DWORD)(This->position/10000000), (DWORD)((This->position/10000)%1000));
 227
 228     IMediaSample_SetTime(pCurrentSample, &time, &This->position);
 229
 230     hr = OutputPin_SendSample(&pOutputPin->pin, pCurrentSample);
 231
 232     if (hr != S_OK)
 233     {
 234         if (hr != S_FALSE)
 235             TRACE("Error sending sample (%x)\n", hr);
 236         else
 237             TRACE("S_FALSE (%d), holding\n", IMediaSample_GetActualDataLength(pCurrentSample));
 238     }
 239
 240     return hr;
 241 }
 242
 243
 244 static HRESULT MPEGSplitter_process_sample(LPVOID iface, IMediaSample * pSample, DWORD_PTR cookie)
 245 {
 246     MPEGSplitterImpl *This = (MPEGSplitterImpl*)iface;
 247     BYTE *pbSrcStream;
 248     DWORD cbSrcStream = 0;
 249     REFERENCE_TIME tStart, tStop, tAviStart = This->position;
 250     Parser_OutputPin * pOutputPin;
 251     HRESULT hr;
 252
 253     pOutputPin = (Parser_OutputPin*)This->Parser.ppPins[1];
 254
 255     hr = IMediaSample_GetTime(pSample, &tStart, &tStop);
 256     if (SUCCEEDED(hr))
 257     {
 258         cbSrcStream = IMediaSample_GetActualDataLength(pSample);
 259         hr = IMediaSample_GetPointer(pSample, &pbSrcStream);
 260     }
 261
 262     /* Flush occurring */
 263     if (cbSrcStream == 0)
 264     {
 265         FIXME(".. Why do I need you?\n");
 266         return S_OK;
 267     }
 268
 269     /* trace removed for performance reasons */
 270     /* TRACE("(%p), %llu -> %llu\n", pSample, tStart, tStop); */
 271
 272     /* Now, try to find a new header */
 273     hr = FillBuffer(This, pSample);
 274     if (hr != S_OK)
 275     {
 276         WARN("Failed with hres: %08x!\n", hr);
 277
 278         /* Unset progression if denied! */
 279         if (hr == VFW_E_WRONG_STATE || hr == S_FALSE)
 280         {
 281             memcpy(This->header, pbSrcStream, 4);
 282             This->Parser.pInputPin->rtCurrent = tStart;
 283             This->position = tAviStart;
 284         }
 285     }
 286
 287     if (BYTES_FROM_MEDIATIME(tStop) >= This->EndOfFile || This->position >= This->Parser.mediaSeeking.llStop)
 288     {
 289         int i;
 290
 291         TRACE("End of file reached\n");
 292
 293         for (i = 0; i < This->Parser.cStreams; i++)
 294         {
 295             IPin* ppin;
 296
 297             hr = IPin_ConnectedTo(This->Parser.ppPins[i+1], &ppin);
 298             if (SUCCEEDED(hr))
 299             {
 300                 hr = IPin_EndOfStream(ppin);
 301                 IPin_Release(ppin);
 302             }
 303             if (FAILED(hr))
 304                 WARN("Error sending EndOfStream to pin %d (%x)\n", i, hr);
 305         }
 306
 307         /* Force the pullpin thread to stop */
 308         hr = S_FALSE;
 309     }
 310
 311     return hr;
 312 }
 313
 314
 315 static HRESULT MPEGSplitter_query_accept(LPVOID iface, const AM_MEDIA_TYPE *pmt)
 316 {
 317     if (!IsEqualIID(&pmt->majortype, &MEDIATYPE_Stream))
 318         return S_FALSE;
 319
 320     if (IsEqualIID(&pmt->subtype, &MEDIASUBTYPE_MPEG1Audio))
 321         return S_OK;
 322
 323     if (IsEqualIID(&pmt->subtype, &MEDIASUBTYPE_MPEG1Video))
 324         FIXME("MPEG-1 video streams not yet supported.\n");
 325     else if (IsEqualIID(&pmt->subtype, &MEDIASUBTYPE_MPEG1System))
 326         FIXME("MPEG-1 system streams not yet supported.\n");
 327     else if (IsEqualIID(&pmt->subtype, &MEDIASUBTYPE_MPEG1VideoCD))
 328         FIXME("MPEG-1 VideoCD streams not yet supported.\n");
 329
 330     return S_FALSE;
 331 }
 332
 333
 334 static HRESULT MPEGSplitter_init_audio(MPEGSplitterImpl *This, const BYTE *header, PIN_INFO *ppiOutput, AM_MEDIA_TYPE *pamt)
 335 {
 336     WAVEFORMATEX *format;
 337     int bitrate_index;
 338     int freq_index;
 339     int mode_ext;
 340     int emphasis;
 341     int lsf = 1;
 342     int mpeg1;
 343     int layer;
 344     int mode;
 345
 346     ZeroMemory(pamt, sizeof(*pamt));
 347     ppiOutput->dir = PINDIR_OUTPUT;
 348     ppiOutput->pFilter = (IBaseFilter*)This;
 349     wsprintfW(ppiOutput->achName, wszAudioStream);
 350
 351     pamt->formattype = FORMAT_WaveFormatEx;
 352     pamt->majortype = MEDIATYPE_Audio;
 353     pamt->subtype = MEDIASUBTYPE_MPEG1AudioPayload;
 354
 355     pamt->lSampleSize = 0;
 356     pamt->bFixedSizeSamples = FALSE;
 357     pamt->bTemporalCompression = 0;
 358
 359     mpeg1 = (header[1]>>4)&0x1;
 360     if (mpeg1)
 361         lsf = ((header[1]>>3)&0x1)^1;
 362
 363     layer         = 4-((header[1]>>1)&0x3);
 364     bitrate_index =   ((header[2]>>4)&0xf);
 365     freq_index    =   ((header[2]>>2)&0x3) + (mpeg1?(lsf*3):6);
 366     mode          =   ((header[3]>>6)&0x3);
 367     mode_ext      =   ((header[3]>>4)&0x3);
 368     emphasis      =   ((header[3]>>0)&0x3);
 369
 370     if (!bitrate_index)
 371     {
 372         /* Set to highest bitrate so samples will fit in for sure */
 373         FIXME("Variable-bitrate audio not fully supported.\n");
 374         bitrate_index = 15;
 375     }
 376
 377     pamt->cbFormat = ((layer==3)? sizeof(MPEGLAYER3WAVEFORMAT) :
 378                                   sizeof(MPEG1WAVEFORMAT));
 379     pamt->pbFormat = CoTaskMemAlloc(pamt->cbFormat);
 380     if (!pamt->pbFormat)
 381         return E_OUTOFMEMORY;
 382     ZeroMemory(pamt->pbFormat, pamt->cbFormat);
 383     format = (WAVEFORMATEX*)pamt->pbFormat;
 384
 385     format->wFormatTag      = ((layer == 3) ? WAVE_FORMAT_MPEGLAYER3 :
 386                                               WAVE_FORMAT_MPEG);
 387     format->nChannels       = ((mode == 3) ? 1 : 2);
 388     format->nSamplesPerSec  = freqs[freq_index];
 389     format->nAvgBytesPerSec = tabsel_123[lsf][layer-1][bitrate_index] * 1000 / 8;
 390
 391     if (layer == 3)
 392         format->nBlockAlign = format->nAvgBytesPerSec * 8 * 144 /
 393                               (format->nSamplesPerSec<<lsf) + 1;
 394     else if (layer == 2)
 395         format->nBlockAlign = format->nAvgBytesPerSec * 8 * 144 /
 396                               format->nSamplesPerSec + 1;
 397     else
 398         format->nBlockAlign = 4 * (format->nAvgBytesPerSec * 8 * 12 / format->nSamplesPerSec + 1);
 399
 400     format->wBitsPerSample = 0;
 401
 402     if (layer == 3)
 403     {
 404         MPEGLAYER3WAVEFORMAT *mp3format = (MPEGLAYER3WAVEFORMAT*)format;
 405
 406         format->cbSize = MPEGLAYER3_WFX_EXTRA_BYTES;
 407
 408         mp3format->wID = MPEGLAYER3_ID_MPEG;
 409         mp3format->fdwFlags = MPEGLAYER3_FLAG_PADDING_ON;
 410         mp3format->nBlockSize = format->nBlockAlign;
 411         mp3format->nFramesPerBlock = 1;
 412
 413         /* Beware the evil magic numbers. This struct is apparently horribly
 414          * under-documented, and the only references I could find had it being
 415          * set to this with no real explanation. It works fine though, so I'm
 416          * not complaining (yet).
 417          */
 418         mp3format->nCodecDelay = 1393;
 419     }
 420     else
 421     {
 422         MPEG1WAVEFORMAT *mpgformat = (MPEG1WAVEFORMAT*)format;
 423
 424         format->cbSize = 22;
 425
 426         mpgformat->fwHeadLayer   = ((layer == 1) ? ACM_MPEG_LAYER1 :
 427                                     ((layer == 2) ? ACM_MPEG_LAYER2 :
 428                                      ACM_MPEG_LAYER3));
 429         mpgformat->dwHeadBitrate = format->nAvgBytesPerSec * 8;
 430         mpgformat->fwHeadMode    = ((mode == 3) ? ACM_MPEG_SINGLECHANNEL :
 431                                     ((mode == 2) ? ACM_MPEG_DUALCHANNEL :
 432                                      ((mode == 1) ? ACM_MPEG_JOINTSTEREO :
 433                                       ACM_MPEG_STEREO)));
 434         mpgformat->fwHeadModeExt = ((mode == 1) ? 0x0F : (1<<mode_ext));
 435         mpgformat->wHeadEmphasis = emphasis + 1;
 436         mpgformat->fwHeadFlags   = ACM_MPEG_ID_MPEG1;
 437     }
 438     pamt->subtype.Data1 = format->wFormatTag;
 439
 440     TRACE("MPEG audio stream detected:\n"
 441           "\tLayer %d (%#x)\n"
 442           "\tFrequency: %d\n"
 443           "\tChannels: %d (%d)\n"
 444           "\tBytesPerSec: %d\n",
 445           layer, format->wFormatTag, format->nSamplesPerSec,
 446           format->nChannels, mode, format->nAvgBytesPerSec);
 447
 448     dump_AM_MEDIA_TYPE(pamt);
 449
 450     return S_OK;
 451 }
 452
 453
 454 static HRESULT MPEGSplitter_pre_connect(IPin *iface, IPin *pConnectPin, ALLOCATOR_PROPERTIES *props)
 455 {
 456     PullPin *pPin = (PullPin *)iface;
 457     MPEGSplitterImpl *This = (MPEGSplitterImpl*)pPin->pin.pinInfo.pFilter;
 458     HRESULT hr;
 459     LONGLONG pos = 0; /* in bytes */
 460     BYTE header[10];
 461     int streamtype = 0;
 462     LONGLONG total, avail;
 463     AM_MEDIA_TYPE amt;
 464     PIN_INFO piOutput;
 465
 466     IAsyncReader_Length(pPin->pReader, &total, &avail);
 467     This->EndOfFile = total;
 468
 469     hr = IAsyncReader_SyncRead(pPin->pReader, pos, 4, header);
 470     if (SUCCEEDED(hr))
 471         pos += 4;
 472
 473     /* Skip ID3 v2 tag, if any */
 474     if (SUCCEEDED(hr) && !strncmp("ID3", (char*)header, 3))
 475     do {
 476         UINT length;
 477         hr = IAsyncReader_SyncRead(pPin->pReader, pos, 6, header + 4);
 478         if (FAILED(hr))
 479             break;
 480         pos += 6;
 481         TRACE("Found ID3 v2.%d.%d\n", header[3], header[4]);
 482         length  = (header[6] & 0x7F) << 21;
 483         length += (header[7] & 0x7F) << 14;
 484         length += (header[8] & 0x7F) << 7;
 485         length += (header[9] & 0x7F);
 486         TRACE("Length: %u\n", length);
 487         pos += length;
 488
 489         /* Read the real header for the mpeg splitter */
 490         hr = IAsyncReader_SyncRead(pPin->pReader, pos, 4, header);
 491         if (SUCCEEDED(hr))
 492             pos += 4;
 493         TRACE("%x:%x:%x:%x\n", header[0], header[1], header[2], header[3]);
 494     } while (0);
 495
 496     while(SUCCEEDED(hr) && !(streamtype=MPEGSplitter_head_check(header)))
 497     {
 498         TRACE("%x:%x:%x:%x\n", header[0], header[1], header[2], header[3]);
 499         /* No valid header yet; shift by a byte and check again */
 500         memmove(header, header+1, 3);
 501         hr = IAsyncReader_SyncRead(pPin->pReader, pos++, 1, header + 3);
 502     }
 503     if (FAILED(hr))
 504         return hr;
 505     pos -= 4;
 506     This->begin_offset = pos;
 507     memcpy(This->header, header, 4);
 508
 509     This->seektable[0].bytepos = pos;
 510     This->seektable[0].timepos = 0;
 511
 512     switch(streamtype)
 513     {
 514         case MPEG_AUDIO_HEADER:
 515         {
 516             LONGLONG duration = 0;
 517             DWORD last_entry = 0;
 518
 519             DWORD ticks = GetTickCount();
 520
 521             hr = MPEGSplitter_init_audio(This, header, &piOutput, &amt);
 522             if (SUCCEEDED(hr))
 523             {
 524                 WAVEFORMATEX *format = (WAVEFORMATEX*)amt.pbFormat;
 525
 526                 props->cbAlign = 1;
 527                 props->cbPrefix = 0;
 528                 /* Make the output buffer a multiple of the frame size */
 529                 props->cbBuffer = 0x4000 / format->nBlockAlign *
 530                                  format->nBlockAlign;
 531                 props->cBuffers = 3;
 532                 hr = Parser_AddPin(&(This->Parser), &piOutput, props, &amt);
 533             }
 534
 535             if (FAILED(hr))
 536             {
 537                 if (amt.pbFormat)
 538                     CoTaskMemFree(amt.pbFormat);
 539                 ERR("Could not create pin for MPEG audio stream (%x)\n", hr);
 540                 break;
 541             }
 542
 543             /* Check for idv1 tag, and remove it from stream if found */
 544             hr = IAsyncReader_SyncRead(pPin->pReader, This->EndOfFile-128, 3, header+4);
 545             if (FAILED(hr))
 546                 break;
 547             if (!strncmp((char*)header+4, "TAG", 3))
 548                 This->EndOfFile -= 128;
 549             This->Parser.pInputPin->rtStop = MEDIATIME_FROM_BYTES(This->EndOfFile);
 550             This->Parser.pInputPin->rtStart = This->Parser.pInputPin->rtCurrent = MEDIATIME_FROM_BYTES(This->begin_offset);
 551
 552             /* http://mpgedit.org/mpgedit/mpeg_format/mpeghdr.htm has a whole read up on audio headers */
 553             while (pos + 3 < This->EndOfFile)
 554             {
 555                 LONGLONG length = 0;
 556                 hr = IAsyncReader_SyncRead(pPin->pReader, pos, 4, header);
 557                 if (hr != S_OK)
 558                     break;
 559                 while (parse_header(header, &length, &duration))
 560                 {
 561                     /* No valid header yet; shift by a byte and check again */
 562                     memmove(header, header+1, 3);
 563                     hr = IAsyncReader_SyncRead(pPin->pReader, pos++, 1, header + 3);
 564                     if (hr != S_OK || This->EndOfFile - pos < 4)
 565                        break;
 566                 }
 567                 pos += length;
 568
 569                 if (This->seektable && (duration / SEEK_INTERVAL) > last_entry)
 570                 {
 571                     if (last_entry + 1 > duration / SEEK_INTERVAL)
 572                     {
 573                         ERR("Somehow skipped %d interval lengths instead of 1\n", (DWORD)(duration/SEEK_INTERVAL) - (last_entry + 1));
 574                     }
 575                     ++last_entry;
 576
 577                     TRACE("Entry: %u\n", last_entry);
 578                     if (last_entry >= This->seek_entries)
 579                     {
 580                         This->seek_entries += 64;
 581                         This->seektable = CoTaskMemRealloc(This->seektable, (This->seek_entries)*sizeof(struct seek_entry));
 582                     }
 583                     This->seektable[last_entry].bytepos = pos;
 584                     This->seektable[last_entry].timepos = duration;
 585                 }
 586
 587                 TRACE("Pos: %x%08x/%x%08x\n", (DWORD)(pos >> 32), (DWORD)pos, (DWORD)(This->EndOfFile>>32), (DWORD)This->EndOfFile);
 588             }
 589             hr = S_OK;
 590             TRACE("Duration: %d seconds\n", (DWORD)(duration / 10000000));
 591             TRACE("Parsing took %u ms\n", GetTickCount() - ticks);
 592             This->duration = duration;
 593
 594             This->Parser.mediaSeeking.llCurrent = 0;
 595             This->Parser.mediaSeeking.llDuration = duration;
 596             This->Parser.mediaSeeking.llStop = duration;
 597             break;
 598         }
 599         case MPEG_VIDEO_HEADER:
 600             FIXME("MPEG video processing not yet supported!\n");
 601             hr = E_FAIL;
 602             break;
 603         case MPEG_SYSTEM_HEADER:
 604             FIXME("MPEG system streams not yet supported!\n");
 605             hr = E_FAIL;
 606             break;
 607
 608         default:
 609             break;
 610     }
 611     This->position = 0;
 612
 613     return hr;
 614 }
 615
 616 static HRESULT MPEGSplitter_cleanup(LPVOID iface)
 617 {
 618     MPEGSplitterImpl *This = (MPEGSplitterImpl*)iface;
 619
 620     TRACE("(%p)\n", This);
 621
 622     return S_OK;
 623 }
 624
 625 static HRESULT MPEGSplitter_seek(IBaseFilter *iface)
 626 {
 627     MPEGSplitterImpl *This = (MPEGSplitterImpl*)iface;
 628     PullPin *pPin = This->Parser.pInputPin;
 629     LONGLONG newpos, timepos, bytepos;
 630     HRESULT hr = S_OK;
 631     BYTE header[4];
 632
 633     newpos = This->Parser.mediaSeeking.llCurrent;
 634
 635     if (newpos > This->duration)
 636     {
 637         WARN("Requesting position %x%08x beyond end of stream %x%08x\n", (DWORD)(newpos>>32), (DWORD)newpos, (DWORD)(This->duration>>32), (DWORD)This->duration);
 638         return E_INVALIDARG;
 639     }
 640
 641     if (This->position/1000000 == newpos/1000000)
 642     {
 643         TRACE("Requesting position %x%08x same as current position %x%08x\n", (DWORD)(newpos>>32), (DWORD)newpos, (DWORD)(This->position>>32), (DWORD)This->position);
 644         return S_OK;
 645     }
 646
 647     /* Position, cached */
 648     bytepos = This->seektable[newpos / SEEK_INTERVAL].bytepos;
 649     timepos = This->seektable[newpos / SEEK_INTERVAL].timepos;
 650
 651     hr = IAsyncReader_SyncRead(pPin->pReader, bytepos, 4, header);
 652     while (bytepos + 3 < This->EndOfFile)
 653     {
 654         LONGLONG length = 0;
 655         hr = IAsyncReader_SyncRead(pPin->pReader, bytepos, 4, header);
 656         if (hr != S_OK || timepos >= newpos)
 657             break;
 658
 659         while (parse_header(header, &length, &timepos) && bytepos + 3 < This->EndOfFile)
 660         {
 661             /* No valid header yet; shift by a byte and check again */
 662             memmove(header, header+1, 3);
 663             hr = IAsyncReader_SyncRead(pPin->pReader, ++bytepos, 1, header + 3);
 664             if (hr != S_OK)
 665                 break;
 666          }
 667          bytepos += length;
 668          TRACE("Pos: %x%08x/%x%08x\n", (DWORD)(bytepos >> 32), (DWORD)bytepos, (DWORD)(This->EndOfFile>>32), (DWORD)This->EndOfFile);
 669     }
 670
 671     if (SUCCEEDED(hr))
 672     {
 673         PullPin *pin = This->Parser.pInputPin;
 674         IPin *victim = NULL;
 675
 676         TRACE("Moving sound to %08u bytes!\n", (DWORD)bytepos);
 677
 678         EnterCriticalSection(&pin->thread_lock);
 679         IPin_BeginFlush((IPin *)pin);
 680
 681         /* Make sure this is done while stopped, BeginFlush takes care of this */
 682         EnterCriticalSection(&This->Parser.csFilter);
 683         memcpy(This->header, header, 4);
 684         IPin_ConnectedTo(This->Parser.ppPins[1], &victim);
 685         if (victim)
 686         {
 687             IPin_NewSegment(victim, newpos, This->duration, pin->dRate);
 688             IPin_Release(victim);
 689         }
 690
 691         pin->rtStart = pin->rtCurrent = MEDIATIME_FROM_BYTES(bytepos);
 692         pin->rtStop = MEDIATIME_FROM_BYTES((REFERENCE_TIME)This->EndOfFile);
 693         This->seek = TRUE;
 694         This->position = newpos;
 695         LeaveCriticalSection(&This->Parser.csFilter);
 696
 697         TRACE("Done flushing\n");
 698         IPin_EndFlush((IPin *)pin);
 699         LeaveCriticalSection(&pin->thread_lock);
 700     }
 701     return hr;
 702 }
 703
 704 static HRESULT MPEGSplitter_disconnect(LPVOID iface)
 705 {
 706     /* TODO: Find memory leaks etc */
 707     return S_OK;
 708 }
 709
 710 static HRESULT MPEGSplitter_first_request(LPVOID iface)
 711 {
 712     MPEGSplitterImpl *This = (MPEGSplitterImpl*)iface;
 713     PullPin *pin = This->Parser.pInputPin;
 714     HRESULT hr;
 715     LONGLONG length;
 716     IMediaSample *sample;
 717
 718     TRACE("Seeking? %d\n", This->seek);
 719     assert(parse_header(This->header, &length, NULL) == S_OK);
 720
 721     if (pin->rtCurrent >= pin->rtStop)
 722     {
 723         /* Last sample has already been queued, request nothing more */
 724         FIXME("Done!\n");
 725         return S_OK;
 726     }
 727
 728     hr = IMemAllocator_GetBuffer(pin->pAlloc, &sample, NULL, NULL, 0);
 729
 730     pin->rtNext = pin->rtCurrent;
 731     if (SUCCEEDED(hr))
 732     {
 733         LONGLONG rtSampleStart = pin->rtNext;
 734         /* Add 4 for the next header, which should hopefully work */
 735         LONGLONG rtSampleStop = rtSampleStart + MEDIATIME_FROM_BYTES(length + 4);
 736
 737         if (rtSampleStop > pin->rtStop)
 738             rtSampleStop = MEDIATIME_FROM_BYTES(ALIGNUP(BYTES_FROM_MEDIATIME(pin->rtStop), pin->cbAlign));
 739
 740         hr = IMediaSample_SetTime(sample, &rtSampleStart, &rtSampleStop);
 741
 742         pin->rtCurrent = pin->rtNext;
 743         pin->rtNext = rtSampleStop;
 744
 745         IMediaSample_SetPreroll(sample, FALSE);
 746         IMediaSample_SetDiscontinuity(sample, This->seek);
 747         IMediaSample_SetSyncPoint(sample, 1);
 748         This->seek = 0;
 749
 750         hr = IAsyncReader_Request(pin->pReader, sample, 0);
 751     }
 752     if (FAILED(hr))
 753         ERR("Horsemen of the apocalypse came to bring error 0x%08x\n", hr);
 754
 755     return hr;
 756 }
 757
 758 static const IBaseFilterVtbl MPEGSplitter_Vtbl =
 759 {
 760     Parser_QueryInterface,
 761     Parser_AddRef,
 762     Parser_Release,
 763     Parser_GetClassID,
 764     Parser_Stop,
 765     Parser_Pause,
 766     Parser_Run,
 767     Parser_GetState,
 768     Parser_SetSyncSource,
 769     Parser_GetSyncSource,
 770     Parser_EnumPins,
 771     Parser_FindPin,
 772     Parser_QueryFilterInfo,
 773     Parser_JoinFilterGraph,
 774     Parser_QueryVendorInfo
 775 };
 776
 777 HRESULT MPEGSplitter_create(IUnknown * pUnkOuter, LPVOID * ppv)
 778 {
 779     MPEGSplitterImpl *This;
 780     HRESULT hr = E_FAIL;
 781
 782     TRACE("(%p, %p)\n", pUnkOuter, ppv);
 783
 784     *ppv = NULL;
 785
 786     if (pUnkOuter)
 787         return CLASS_E_NOAGGREGATION;
 788
 789     This = CoTaskMemAlloc(sizeof(MPEGSplitterImpl));
 790     if (!This)
 791         return E_OUTOFMEMORY;
 792
 793     ZeroMemory(This, sizeof(MPEGSplitterImpl));
 794     This->seektable = CoTaskMemAlloc(sizeof(struct seek_entry) * 64);
 795     if (!This->seektable)
 796     {
 797         CoTaskMemFree(This);
 798         return E_OUTOFMEMORY;
 799     }
 800     This->seek_entries = 64;
 801
 802     hr = Parser_Create(&(This->Parser), &MPEGSplitter_Vtbl, &CLSID_MPEG1Splitter, MPEGSplitter_process_sample, MPEGSplitter_query_accept, MPEGSplitter_pre_connect, MPEGSplitter_cleanup, MPEGSplitter_disconnect, MPEGSplitter_first_request, NULL, NULL, MPEGSplitter_seek, NULL);
 803     if (FAILED(hr))
 804     {
 805         CoTaskMemFree(This);
 806         return hr;
 807     }
 808     This->seek = 1;
 809
 810     /* Note: This memory is managed by the parser filter once created */
 811     *ppv = (LPVOID)This;
 812
 813     return hr;
 814 }