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 inline MPEGSplitterImpl *impl_from_IMediaSeeking( IMediaSeeking *iface )
  81 {
  82     return (MPEGSplitterImpl *)((char*)iface - FIELD_OFFSET(MPEGSplitterImpl, Parser.sourceSeeking.lpVtbl));
  83 }
  84
  85 static int MPEGSplitter_head_check(const BYTE *header)
  86 {
  87     /* If this is a possible start code, check for a system or video header */
  88     if (header[0] == 0 && header[1] == 0 && header[2] == 1)
  89     {
  90         /* Check if we got a system or elementary stream start code */
  91         if (header[3] == PACK_START_CODE ||
  92             header[3] == VIDEO_ELEMENTARY_STREAM ||
  93             header[3] == AUDIO_ELEMENTARY_STREAM)
  94             return MPEG_SYSTEM_HEADER;
  95
  96         /* Check for a MPEG video sequence start code */
  97         if (header[3] == SEQUENCE_HEADER_CODE)
  98             return MPEG_VIDEO_HEADER;
  99     }
 100
 101     /* This should give a good guess if we have an MPEG audio header */
 102     if(header[0] == 0xff && ((header[1]>>5)&0x7) == 0x7 &&
 103        ((header[1]>>1)&0x3) != 0 && ((header[2]>>4)&0xf) != 0xf &&
 104        ((header[2]>>2)&0x3) != 0x3)
 105         return MPEG_AUDIO_HEADER;
 106
 107     /* Nothing yet.. */
 108     return MPEG_NO_HEADER;
 109 }
 110
 111 static const WCHAR wszAudioStream[] = {'A','u','d','i','o',0};
 112 static const WCHAR wszVideoStream[] = {'V','i','d','e','o',0};
 113
 114 static const DWORD freqs[10] = { 44100, 48000, 32000, 22050, 24000, 16000, 11025, 12000,  8000, 0 };
 115
 116 static const DWORD tabsel_123[2][3][16] = {
 117     { {0,32,64,96,128,160,192,224,256,288,320,352,384,416,448,},
 118       {0,32,48,56, 64, 80, 96,112,128,160,192,224,256,320,384,},
 119       {0,32,40,48, 56, 64, 80, 96,112,128,160,192,224,256,320,} },
 120
 121     { {0,32,48,56,64,80,96,112,128,144,160,176,192,224,256,},
 122       {0,8,16,24,32,40,48,56,64,80,96,112,128,144,160,},
 123       {0,8,16,24,32,40,48,56,64,80,96,112,128,144,160,} }
 124 };
 125
 126 static HRESULT parse_header(BYTE *header, LONGLONG *plen, LONGLONG *pduration)
 127 {
 128     LONGLONG duration;
 129
 130     int bitrate_index, freq_index, lsf = 1, mpeg1, layer, padding, bitrate, length;
 131
 132     if (!(header[0] == 0xff && ((header[1]>>5)&0x7) == 0x7 &&
 133        ((header[1]>>1)&0x3) != 0 && ((header[2]>>4)&0xf) != 0xf &&
 134        ((header[2]>>2)&0x3) != 0x3))
 135     {
 136         FIXME("Not a valid header: %02x:%02x\n", header[0], header[1]);
 137         return E_INVALIDARG;
 138     }
 139
 140     mpeg1 = (header[1]>>4)&0x1;
 141     if (mpeg1)
 142         lsf = ((header[1]>>3)&0x1)^1;
 143
 144     layer = 4-((header[1]>>1)&0x3);
 145     bitrate_index = ((header[2]>>4)&0xf);
 146     freq_index = ((header[2]>>2)&0x3) + (mpeg1?(lsf*3):6);
 147     padding = ((header[2]>>1)&0x1);
 148
 149     bitrate = tabsel_123[lsf][layer-1][bitrate_index] * 1000;
 150     if (!bitrate || layer != 3)
 151     {
 152         FIXME("Not a valid header: %02x:%02x:%02x:%02x\n", header[0], header[1], header[2], header[3]);
 153         return E_INVALIDARG;
 154     }
 155
 156
 157     if (layer == 3 || layer == 2)
 158         length = 144 * bitrate / freqs[freq_index] + padding;
 159     else
 160         length = 4 * (12 * bitrate / freqs[freq_index] + padding);
 161
 162     duration = (ULONGLONG)10000000 * (ULONGLONG)(length) / (ULONGLONG)(bitrate/8);
 163     *plen = length;
 164     if (pduration)
 165         *pduration += duration;
 166     return S_OK;
 167 }
 168
 169 static HRESULT FillBuffer(MPEGSplitterImpl *This, IMediaSample *pCurrentSample)
 170 {
 171     Parser_OutputPin * pOutputPin = (Parser_OutputPin*)This->Parser.ppPins[1];
 172     LONGLONG length = 0;
 173     LONGLONG pos = BYTES_FROM_MEDIATIME(This->Parser.pInputPin->rtNext);
 174     LONGLONG time = This->position;
 175     HRESULT hr;
 176     BYTE *fbuf = NULL;
 177     DWORD len = IMediaSample_GetActualDataLength(pCurrentSample);
 178
 179     TRACE("Source length: %u\n", len);
 180     IMediaSample_GetPointer(pCurrentSample, &fbuf);
 181
 182     /* Find the next valid header.. it <SHOULD> be right here */
 183     assert(parse_header(fbuf, &length, &This->position) == S_OK);
 184     IMediaSample_SetActualDataLength(pCurrentSample, length);
 185
 186     /* Queue the next sample */
 187     if (length + 4 == len)
 188     {
 189         PullPin *pin = This->Parser.pInputPin;
 190         LONGLONG stop = BYTES_FROM_MEDIATIME(pin->rtStop);
 191
 192         hr = S_OK;
 193         memcpy(This->header, fbuf + length, 4);
 194         while (FAILED(hr = parse_header(This->header, &length, NULL)))
 195         {
 196             memmove(This->header, This->header+1, 3);
 197             if (pos + 4 >= stop)
 198                 break;
 199             IAsyncReader_SyncRead(pin->pReader, ++pos, 1, This->header + 3);
 200         }
 201         pin->rtNext = MEDIATIME_FROM_BYTES(pos);
 202
 203         if (SUCCEEDED(hr))
 204         {
 205             /* Remove 4 for the last header, which should hopefully work */
 206             IMediaSample *sample = NULL;
 207             LONGLONG rtSampleStart = pin->rtNext - MEDIATIME_FROM_BYTES(4);
 208             LONGLONG rtSampleStop = rtSampleStart + MEDIATIME_FROM_BYTES(length + 4);
 209
 210             if (rtSampleStop > pin->rtStop)
 211                 rtSampleStop = MEDIATIME_FROM_BYTES(ALIGNUP(BYTES_FROM_MEDIATIME(pin->rtStop), pin->cbAlign));
 212
 213             hr = IMemAllocator_GetBuffer(pin->pAlloc, &sample, NULL, NULL, 0);
 214             if (SUCCEEDED(hr))
 215             {
 216                 IMediaSample_SetTime(sample, &rtSampleStart, &rtSampleStop);
 217                 IMediaSample_SetPreroll(sample, 0);
 218                 IMediaSample_SetDiscontinuity(sample, 0);
 219                 IMediaSample_SetSyncPoint(sample, 1);
 220                 pin->rtCurrent = rtSampleStart;
 221                 pin->rtNext = rtSampleStop;
 222                 hr = IAsyncReader_Request(pin->pReader, sample, 0);
 223             }
 224             if (FAILED(hr))
 225                 FIXME("o_Ox%08x\n", hr);
 226         }
 227     }
 228     /* If not, we're presumably at the end of file */
 229
 230     TRACE("Media time : %u.%03u\n", (DWORD)(This->position/10000000), (DWORD)((This->position/10000)%1000));
 231
 232     IMediaSample_SetTime(pCurrentSample, &time, &This->position);
 233
 234     hr = BaseOutputPinImpl_Deliver((BaseOutputPin*)&pOutputPin->pin, pCurrentSample);
 235
 236     if (hr != S_OK)
 237     {
 238         if (hr != S_FALSE)
 239             TRACE("Error sending sample (%x)\n", hr);
 240         else
 241             TRACE("S_FALSE (%d), holding\n", IMediaSample_GetActualDataLength(pCurrentSample));
 242     }
 243
 244     return hr;
 245 }
 246
 247
 248 static HRESULT MPEGSplitter_process_sample(LPVOID iface, IMediaSample * pSample, DWORD_PTR cookie)
 249 {
 250     MPEGSplitterImpl *This = iface;
 251     BYTE *pbSrcStream;
 252     DWORD cbSrcStream = 0;
 253     REFERENCE_TIME tStart, tStop, tAviStart = This->position;
 254     HRESULT hr;
 255
 256     hr = IMediaSample_GetTime(pSample, &tStart, &tStop);
 257     if (SUCCEEDED(hr))
 258     {
 259         cbSrcStream = IMediaSample_GetActualDataLength(pSample);
 260         hr = IMediaSample_GetPointer(pSample, &pbSrcStream);
 261     }
 262
 263     /* Flush occurring */
 264     if (cbSrcStream == 0)
 265     {
 266         FIXME(".. Why do I need you?\n");
 267         return S_OK;
 268     }
 269
 270     /* trace removed for performance reasons */
 271     /* TRACE("(%p), %llu -> %llu\n", pSample, tStart, tStop); */
 272
 273     /* Now, try to find a new header */
 274     hr = FillBuffer(This, pSample);
 275     if (hr != S_OK)
 276     {
 277         WARN("Failed with hres: %08x!\n", hr);
 278
 279         /* Unset progression if denied! */
 280         if (hr == VFW_E_WRONG_STATE || hr == S_FALSE)
 281         {
 282             memcpy(This->header, pbSrcStream, 4);
 283             This->Parser.pInputPin->rtCurrent = tStart;
 284             This->position = tAviStart;
 285         }
 286     }
 287
 288     if (BYTES_FROM_MEDIATIME(tStop) >= This->EndOfFile || This->position >= This->Parser.sourceSeeking.llStop)
 289     {
 290         unsigned int i;
 291
 292         TRACE("End of file reached\n");
 293
 294         for (i = 0; i < This->Parser.cStreams; i++)
 295         {
 296             IPin* ppin;
 297
 298             hr = IPin_ConnectedTo(This->Parser.ppPins[i+1], &ppin);
 299             if (SUCCEEDED(hr))
 300             {
 301                 hr = IPin_EndOfStream(ppin);
 302                 IPin_Release(ppin);
 303             }
 304             if (FAILED(hr))
 305                 WARN("Error sending EndOfStream to pin %u (%x)\n", i, hr);
 306         }
 307
 308         /* Force the pullpin thread to stop */
 309         hr = S_FALSE;
 310     }
 311
 312     return hr;
 313 }
 314
 315
 316 static HRESULT MPEGSplitter_query_accept(LPVOID iface, const AM_MEDIA_TYPE *pmt)
 317 {
 318     if (!IsEqualIID(&pmt->majortype, &MEDIATYPE_Stream))
 319         return S_FALSE;
 320
 321     if (IsEqualIID(&pmt->subtype, &MEDIASUBTYPE_MPEG1Audio))
 322         return S_OK;
 323
 324     if (IsEqualIID(&pmt->subtype, &MEDIASUBTYPE_MPEG1Video))
 325         FIXME("MPEG-1 video streams not yet supported.\n");
 326     else if (IsEqualIID(&pmt->subtype, &MEDIASUBTYPE_MPEG1System))
 327         FIXME("MPEG-1 system streams not yet supported.\n");
 328     else if (IsEqualIID(&pmt->subtype, &MEDIASUBTYPE_MPEG1VideoCD))
 329         FIXME("MPEG-1 VideoCD streams not yet supported.\n");
 330
 331     return S_FALSE;
 332 }
 333
 334
 335 static HRESULT MPEGSplitter_init_audio(MPEGSplitterImpl *This, const BYTE *header, PIN_INFO *ppiOutput, AM_MEDIA_TYPE *pamt)
 336 {
 337     WAVEFORMATEX *format;
 338     int bitrate_index;
 339     int freq_index;
 340     int mode_ext;
 341     int emphasis;
 342     int lsf = 1;
 343     int mpeg1;
 344     int layer;
 345     int mode;
 346
 347     ZeroMemory(pamt, sizeof(*pamt));
 348     ppiOutput->dir = PINDIR_OUTPUT;
 349     ppiOutput->pFilter = (IBaseFilter*)This;
 350     wsprintfW(ppiOutput->achName, wszAudioStream);
 351
 352     pamt->formattype = FORMAT_WaveFormatEx;
 353     pamt->majortype = MEDIATYPE_Audio;
 354     pamt->subtype = MEDIASUBTYPE_MPEG1AudioPayload;
 355
 356     pamt->lSampleSize = 0;
 357     pamt->bFixedSizeSamples = FALSE;
 358     pamt->bTemporalCompression = 0;
 359
 360     mpeg1 = (header[1]>>4)&0x1;
 361     if (mpeg1)
 362         lsf = ((header[1]>>3)&0x1)^1;
 363
 364     layer         = 4-((header[1]>>1)&0x3);
 365     bitrate_index =   ((header[2]>>4)&0xf);
 366     freq_index    =   ((header[2]>>2)&0x3) + (mpeg1?(lsf*3):6);
 367     mode          =   ((header[3]>>6)&0x3);
 368     mode_ext      =   ((header[3]>>4)&0x3);
 369     emphasis      =   ((header[3]>>0)&0x3);
 370
 371     if (!bitrate_index)
 372     {
 373         /* Set to highest bitrate so samples will fit in for sure */
 374         FIXME("Variable-bitrate audio not fully supported.\n");
 375         bitrate_index = 15;
 376     }
 377
 378     pamt->cbFormat = ((layer==3)? sizeof(MPEGLAYER3WAVEFORMAT) :
 379                                   sizeof(MPEG1WAVEFORMAT));
 380     pamt->pbFormat = CoTaskMemAlloc(pamt->cbFormat);
 381     if (!pamt->pbFormat)
 382         return E_OUTOFMEMORY;
 383     ZeroMemory(pamt->pbFormat, pamt->cbFormat);
 384     format = (WAVEFORMATEX*)pamt->pbFormat;
 385
 386     format->wFormatTag      = ((layer == 3) ? WAVE_FORMAT_MPEGLAYER3 :
 387                                               WAVE_FORMAT_MPEG);
 388     format->nChannels       = ((mode == 3) ? 1 : 2);
 389     format->nSamplesPerSec  = freqs[freq_index];
 390     format->nAvgBytesPerSec = tabsel_123[lsf][layer-1][bitrate_index] * 1000 / 8;
 391
 392     if (layer == 3)
 393         format->nBlockAlign = format->nAvgBytesPerSec * 8 * 144 /
 394                               (format->nSamplesPerSec<<lsf) + 1;
 395     else if (layer == 2)
 396         format->nBlockAlign = format->nAvgBytesPerSec * 8 * 144 /
 397                               format->nSamplesPerSec + 1;
 398     else
 399         format->nBlockAlign = 4 * (format->nAvgBytesPerSec * 8 * 12 / format->nSamplesPerSec + 1);
 400
 401     format->wBitsPerSample = 0;
 402
 403     if (layer == 3)
 404     {
 405         MPEGLAYER3WAVEFORMAT *mp3format = (MPEGLAYER3WAVEFORMAT*)format;
 406
 407         format->cbSize = MPEGLAYER3_WFX_EXTRA_BYTES;
 408
 409         mp3format->wID = MPEGLAYER3_ID_MPEG;
 410         mp3format->fdwFlags = MPEGLAYER3_FLAG_PADDING_ON;
 411         mp3format->nBlockSize = format->nBlockAlign;
 412         mp3format->nFramesPerBlock = 1;
 413
 414         /* Beware the evil magic numbers. This struct is apparently horribly
 415          * under-documented, and the only references I could find had it being
 416          * set to this with no real explanation. It works fine though, so I'm
 417          * not complaining (yet).
 418          */
 419         mp3format->nCodecDelay = 1393;
 420     }
 421     else
 422     {
 423         MPEG1WAVEFORMAT *mpgformat = (MPEG1WAVEFORMAT*)format;
 424
 425         format->cbSize = 22;
 426
 427         mpgformat->fwHeadLayer   = ((layer == 1) ? ACM_MPEG_LAYER1 :
 428                                     ((layer == 2) ? ACM_MPEG_LAYER2 :
 429                                      ACM_MPEG_LAYER3));
 430         mpgformat->dwHeadBitrate = format->nAvgBytesPerSec * 8;
 431         mpgformat->fwHeadMode    = ((mode == 3) ? ACM_MPEG_SINGLECHANNEL :
 432                                     ((mode == 2) ? ACM_MPEG_DUALCHANNEL :
 433                                      ((mode == 1) ? ACM_MPEG_JOINTSTEREO :
 434                                       ACM_MPEG_STEREO)));
 435         mpgformat->fwHeadModeExt = ((mode == 1) ? 0x0F : (1<<mode_ext));
 436         mpgformat->wHeadEmphasis = emphasis + 1;
 437         mpgformat->fwHeadFlags   = ACM_MPEG_ID_MPEG1;
 438     }
 439     pamt->subtype.Data1 = format->wFormatTag;
 440
 441     TRACE("MPEG audio stream detected:\n"
 442           "\tLayer %d (%#x)\n"
 443           "\tFrequency: %d\n"
 444           "\tChannels: %d (%d)\n"
 445           "\tBytesPerSec: %d\n",
 446           layer, format->wFormatTag, format->nSamplesPerSec,
 447           format->nChannels, mode, format->nAvgBytesPerSec);
 448
 449     dump_AM_MEDIA_TYPE(pamt);
 450
 451     return S_OK;
 452 }
 453
 454
 455 static HRESULT MPEGSplitter_pre_connect(IPin *iface, IPin *pConnectPin, ALLOCATOR_PROPERTIES *props)
 456 {
 457     PullPin *pPin = (PullPin *)iface;
 458     MPEGSplitterImpl *This = (MPEGSplitterImpl*)pPin->pin.pinInfo.pFilter;
 459     HRESULT hr;
 460     LONGLONG pos = 0; /* in bytes */
 461     BYTE header[10];
 462     int streamtype = 0;
 463     LONGLONG total, avail;
 464     AM_MEDIA_TYPE amt;
 465     PIN_INFO piOutput;
 466
 467     IAsyncReader_Length(pPin->pReader, &total, &avail);
 468     This->EndOfFile = total;
 469
 470     hr = IAsyncReader_SyncRead(pPin->pReader, pos, 4, header);
 471     if (SUCCEEDED(hr))
 472         pos += 4;
 473
 474     /* Skip ID3 v2 tag, if any */
 475     if (SUCCEEDED(hr) && !memcmp("ID3", header, 3))
 476     do {
 477         UINT length;
 478         hr = IAsyncReader_SyncRead(pPin->pReader, pos, 6, header + 4);
 479         if (FAILED(hr))
 480             break;
 481         pos += 6;
 482         TRACE("Found ID3 v2.%d.%d\n", header[3], header[4]);
 483         length  = (header[6] & 0x7F) << 21;
 484         length += (header[7] & 0x7F) << 14;
 485         length += (header[8] & 0x7F) << 7;
 486         length += (header[9] & 0x7F);
 487         TRACE("Length: %u\n", length);
 488         pos += length;
 489
 490         /* Read the real header for the mpeg splitter */
 491         hr = IAsyncReader_SyncRead(pPin->pReader, pos, 4, header);
 492         if (SUCCEEDED(hr))
 493             pos += 4;
 494         TRACE("%x:%x:%x:%x\n", header[0], header[1], header[2], header[3]);
 495     } while (0);
 496
 497     while(SUCCEEDED(hr) && !(streamtype=MPEGSplitter_head_check(header)))
 498     {
 499         TRACE("%x:%x:%x:%x\n", header[0], header[1], header[2], header[3]);
 500         /* No valid header yet; shift by a byte and check again */
 501         memmove(header, header+1, 3);
 502         hr = IAsyncReader_SyncRead(pPin->pReader, pos++, 1, header + 3);
 503     }
 504     if (FAILED(hr))
 505         return hr;
 506     pos -= 4;
 507     This->begin_offset = pos;
 508     memcpy(This->header, header, 4);
 509
 510     This->seektable[0].bytepos = pos;
 511     This->seektable[0].timepos = 0;
 512
 513     switch(streamtype)
 514     {
 515         case MPEG_AUDIO_HEADER:
 516         {
 517             LONGLONG duration = 0;
 518             DWORD last_entry = 0;
 519
 520             DWORD ticks = GetTickCount();
 521
 522             hr = MPEGSplitter_init_audio(This, header, &piOutput, &amt);
 523             if (SUCCEEDED(hr))
 524             {
 525                 WAVEFORMATEX *format = (WAVEFORMATEX*)amt.pbFormat;
 526
 527                 props->cbAlign = 1;
 528                 props->cbPrefix = 0;
 529                 /* Make the output buffer a multiple of the frame size */
 530                 props->cbBuffer = 0x4000 / format->nBlockAlign *
 531                                  format->nBlockAlign;
 532                 props->cBuffers = 3;
 533                 hr = Parser_AddPin(&(This->Parser), &piOutput, props, &amt);
 534             }
 535
 536             if (FAILED(hr))
 537             {
 538                 if (amt.pbFormat)
 539                     CoTaskMemFree(amt.pbFormat);
 540                 ERR("Could not create pin for MPEG audio stream (%x)\n", hr);
 541                 break;
 542             }
 543
 544             /* Check for idv1 tag, and remove it from stream if found */
 545             hr = IAsyncReader_SyncRead(pPin->pReader, This->EndOfFile-128, 3, header+4);
 546             if (FAILED(hr))
 547                 break;
 548             if (!strncmp((char*)header+4, "TAG", 3))
 549                 This->EndOfFile -= 128;
 550             This->Parser.pInputPin->rtStop = MEDIATIME_FROM_BYTES(This->EndOfFile);
 551             This->Parser.pInputPin->rtStart = This->Parser.pInputPin->rtCurrent = MEDIATIME_FROM_BYTES(This->begin_offset);
 552
 553             /* http://mpgedit.org/mpgedit/mpeg_format/mpeghdr.htm has a whole read up on audio headers */
 554             while (pos + 3 < This->EndOfFile)
 555             {
 556                 LONGLONG length = 0;
 557                 hr = IAsyncReader_SyncRead(pPin->pReader, pos, 4, header);
 558                 if (hr != S_OK)
 559                     break;
 560                 while (parse_header(header, &length, &duration))
 561                 {
 562                     /* No valid header yet; shift by a byte and check again */
 563                     memmove(header, header+1, 3);
 564                     hr = IAsyncReader_SyncRead(pPin->pReader, pos++, 1, header + 3);
 565                     if (hr != S_OK || This->EndOfFile - pos < 4)
 566                        break;
 567                 }
 568                 pos += length;
 569
 570                 if (This->seektable && (duration / SEEK_INTERVAL) > last_entry)
 571                 {
 572                     if (last_entry + 1 > duration / SEEK_INTERVAL)
 573                     {
 574                         ERR("Somehow skipped %d interval lengths instead of 1\n", (DWORD)(duration/SEEK_INTERVAL) - (last_entry + 1));
 575                     }
 576                     ++last_entry;
 577
 578                     TRACE("Entry: %u\n", last_entry);
 579                     if (last_entry >= This->seek_entries)
 580                     {
 581                         This->seek_entries += 64;
 582                         This->seektable = CoTaskMemRealloc(This->seektable, (This->seek_entries)*sizeof(struct seek_entry));
 583                     }
 584                     This->seektable[last_entry].bytepos = pos;
 585                     This->seektable[last_entry].timepos = duration;
 586                 }
 587
 588                 TRACE("Pos: %x%08x/%x%08x\n", (DWORD)(pos >> 32), (DWORD)pos, (DWORD)(This->EndOfFile>>32), (DWORD)This->EndOfFile);
 589             }
 590             hr = S_OK;
 591             TRACE("Duration: %d seconds\n", (DWORD)(duration / 10000000));
 592             TRACE("Parsing took %u ms\n", GetTickCount() - ticks);
 593             This->duration = duration;
 594
 595             This->Parser.sourceSeeking.llCurrent = 0;
 596             This->Parser.sourceSeeking.llDuration = duration;
 597             This->Parser.sourceSeeking.llStop = duration;
 598             break;
 599         }
 600         case MPEG_VIDEO_HEADER:
 601             FIXME("MPEG video processing not yet supported!\n");
 602             hr = E_FAIL;
 603             break;
 604         case MPEG_SYSTEM_HEADER:
 605             FIXME("MPEG system streams not yet supported!\n");
 606             hr = E_FAIL;
 607             break;
 608
 609         default:
 610             break;
 611     }
 612     This->position = 0;
 613
 614     return hr;
 615 }
 616
 617 static HRESULT MPEGSplitter_cleanup(LPVOID iface)
 618 {
 619     MPEGSplitterImpl *This = iface;
 620
 621     TRACE("(%p)\n", This);
 622
 623     return S_OK;
 624 }
 625
 626 static HRESULT WINAPI MPEGSplitter_seek(IMediaSeeking *iface)
 627 {
 628     MPEGSplitterImpl *This = impl_from_IMediaSeeking(iface);
 629     PullPin *pPin = This->Parser.pInputPin;
 630     LONGLONG newpos, timepos, bytepos;
 631     HRESULT hr = S_OK;
 632     BYTE header[4];
 633
 634     newpos = This->Parser.sourceSeeking.llCurrent;
 635
 636     if (newpos > This->duration)
 637     {
 638         WARN("Requesting position %x%08x beyond end of stream %x%08x\n", (DWORD)(newpos>>32), (DWORD)newpos, (DWORD)(This->duration>>32), (DWORD)This->duration);
 639         return E_INVALIDARG;
 640     }
 641
 642     if (This->position/1000000 == newpos/1000000)
 643     {
 644         TRACE("Requesting position %x%08x same as current position %x%08x\n", (DWORD)(newpos>>32), (DWORD)newpos, (DWORD)(This->position>>32), (DWORD)This->position);
 645         return S_OK;
 646     }
 647
 648     /* Position, cached */
 649     bytepos = This->seektable[newpos / SEEK_INTERVAL].bytepos;
 650     timepos = This->seektable[newpos / SEEK_INTERVAL].timepos;
 651
 652     hr = IAsyncReader_SyncRead(pPin->pReader, bytepos, 4, header);
 653     while (bytepos + 3 < This->EndOfFile)
 654     {
 655         LONGLONG length = 0;
 656         hr = IAsyncReader_SyncRead(pPin->pReader, bytepos, 4, header);
 657         if (hr != S_OK || timepos >= newpos)
 658             break;
 659
 660         while (parse_header(header, &length, &timepos) && bytepos + 3 < This->EndOfFile)
 661         {
 662             /* No valid header yet; shift by a byte and check again */
 663             memmove(header, header+1, 3);
 664             hr = IAsyncReader_SyncRead(pPin->pReader, ++bytepos, 1, header + 3);
 665             if (hr != S_OK)
 666                 break;
 667          }
 668          bytepos += length;
 669          TRACE("Pos: %x%08x/%x%08x\n", (DWORD)(bytepos >> 32), (DWORD)bytepos, (DWORD)(This->EndOfFile>>32), (DWORD)This->EndOfFile);
 670     }
 671
 672     if (SUCCEEDED(hr))
 673     {
 674         PullPin *pin = This->Parser.pInputPin;
 675         IPin *victim = NULL;
 676
 677         TRACE("Moving sound to %08u bytes!\n", (DWORD)bytepos);
 678
 679         EnterCriticalSection(&pin->thread_lock);
 680         IPin_BeginFlush((IPin *)pin);
 681
 682         /* Make sure this is done while stopped, BeginFlush takes care of this */
 683         EnterCriticalSection(&This->Parser.filter.csFilter);
 684         memcpy(This->header, header, 4);
 685         IPin_ConnectedTo(This->Parser.ppPins[1], &victim);
 686         if (victim)
 687         {
 688             IPin_NewSegment(victim, newpos, This->duration, pin->dRate);
 689             IPin_Release(victim);
 690         }
 691
 692         pin->rtStart = pin->rtCurrent = MEDIATIME_FROM_BYTES(bytepos);
 693         pin->rtStop = MEDIATIME_FROM_BYTES((REFERENCE_TIME)This->EndOfFile);
 694         This->seek = TRUE;
 695         This->position = newpos;
 696         LeaveCriticalSection(&This->Parser.filter.csFilter);
 697
 698         TRACE("Done flushing\n");
 699         IPin_EndFlush((IPin *)pin);
 700         LeaveCriticalSection(&pin->thread_lock);
 701     }
 702     return hr;
 703 }
 704
 705 static HRESULT MPEGSplitter_disconnect(LPVOID iface)
 706 {
 707     /* TODO: Find memory leaks etc */
 708     return S_OK;
 709 }
 710
 711 static HRESULT MPEGSplitter_first_request(LPVOID iface)
 712 {
 713     MPEGSplitterImpl *This = iface;
 714     PullPin *pin = This->Parser.pInputPin;
 715     HRESULT hr;
 716     LONGLONG length;
 717     IMediaSample *sample;
 718
 719     TRACE("Seeking? %d\n", This->seek);
 720     assert(parse_header(This->header, &length, NULL) == S_OK);
 721
 722     if (pin->rtCurrent >= pin->rtStop)
 723     {
 724         /* Last sample has already been queued, request nothing more */
 725         FIXME("Done!\n");
 726         return S_OK;
 727     }
 728
 729     hr = IMemAllocator_GetBuffer(pin->pAlloc, &sample, NULL, NULL, 0);
 730
 731     pin->rtNext = pin->rtCurrent;
 732     if (SUCCEEDED(hr))
 733     {
 734         LONGLONG rtSampleStart = pin->rtNext;
 735         /* Add 4 for the next header, which should hopefully work */
 736         LONGLONG rtSampleStop = rtSampleStart + MEDIATIME_FROM_BYTES(length + 4);
 737
 738         if (rtSampleStop > pin->rtStop)
 739             rtSampleStop = MEDIATIME_FROM_BYTES(ALIGNUP(BYTES_FROM_MEDIATIME(pin->rtStop), pin->cbAlign));
 740
 741         hr = IMediaSample_SetTime(sample, &rtSampleStart, &rtSampleStop);
 742
 743         pin->rtCurrent = pin->rtNext;
 744         pin->rtNext = rtSampleStop;
 745
 746         IMediaSample_SetPreroll(sample, FALSE);
 747         IMediaSample_SetDiscontinuity(sample, This->seek);
 748         IMediaSample_SetSyncPoint(sample, 1);
 749         This->seek = 0;
 750
 751         hr = IAsyncReader_Request(pin->pReader, sample, 0);
 752     }
 753     if (FAILED(hr))
 754         ERR("Horsemen of the apocalypse came to bring error 0x%08x\n", hr);
 755
 756     return hr;
 757 }
 758
 759 static const IBaseFilterVtbl MPEGSplitter_Vtbl =
 760 {
 761     Parser_QueryInterface,
 762     Parser_AddRef,
 763     Parser_Release,
 764     Parser_GetClassID,
 765     Parser_Stop,
 766     Parser_Pause,
 767     Parser_Run,
 768     Parser_GetState,
 769     Parser_SetSyncSource,
 770     Parser_GetSyncSource,
 771     Parser_EnumPins,
 772     Parser_FindPin,
 773     Parser_QueryFilterInfo,
 774     Parser_JoinFilterGraph,
 775     Parser_QueryVendorInfo
 776 };
 777
 778 HRESULT MPEGSplitter_create(IUnknown * pUnkOuter, LPVOID * ppv)
 779 {
 780     MPEGSplitterImpl *This;
 781     HRESULT hr = E_FAIL;
 782
 783     TRACE("(%p, %p)\n", pUnkOuter, ppv);
 784
 785     *ppv = NULL;
 786
 787     if (pUnkOuter)
 788         return CLASS_E_NOAGGREGATION;
 789
 790     This = CoTaskMemAlloc(sizeof(MPEGSplitterImpl));
 791     if (!This)
 792         return E_OUTOFMEMORY;
 793
 794     ZeroMemory(This, sizeof(MPEGSplitterImpl));
 795     This->seektable = CoTaskMemAlloc(sizeof(struct seek_entry) * 64);
 796     if (!This->seektable)
 797     {
 798         CoTaskMemFree(This);
 799         return E_OUTOFMEMORY;
 800     }
 801     This->seek_entries = 64;
 802
 803     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);
 804     if (FAILED(hr))
 805     {
 806         CoTaskMemFree(This);
 807         return hr;
 808     }
 809     This->seek = 1;
 810
 811     /* Note: This memory is managed by the parser filter once created */
 812     *ppv = This;
 813
 814     return hr;
 815 }