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  *
   8  * This library is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2.1 of the License, or (at your option) any later version.
  12  *
  13  * This library is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with this library; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  21  */
  22
  23 #include <assert.h>
  24 #include <math.h>
  25
  26 #include "quartz_private.h"
  27 #include "control_private.h"
  28 #include "pin.h"
  29
  30 #include "uuids.h"
  31 #include "mmreg.h"
  32 #include "mmsystem.h"
  33
  34 #include "winternl.h"
  35
  36 #include "wine/unicode.h"
  37 #include "wine/debug.h"
  38
  39 #include "parser.h"
  40
  41 WINE_DEFAULT_DEBUG_CHANNEL(quartz);
  42
  43 #define SEQUENCE_HEADER_CODE     0xB3
  44 #define PACK_START_CODE          0xBA
  45
  46 #define SYSTEM_START_CODE        0xBB
  47 #define AUDIO_ELEMENTARY_STREAM  0xC0
  48 #define VIDEO_ELEMENTARY_STREAM  0xE0
  49
  50 #define MPEG_SYSTEM_HEADER 3
  51 #define MPEG_VIDEO_HEADER 2
  52 #define MPEG_AUDIO_HEADER 1
  53 #define MPEG_NO_HEADER 0
  54
  55 typedef struct MPEGSplitterImpl
  56 {
  57     ParserImpl Parser;
  58     IMediaSample *pCurrentSample;
  59     LONGLONG EndOfFile;
  60     DWORD dwSampleSize, dwLength;
  61     FLOAT fSamplesPerSec;
  62 } MPEGSplitterImpl;
  63
  64 static int MPEGSplitter_head_check(const BYTE *header)
  65 {
  66     /* If this is a possible start code, check for a system or video header */
  67     if (header[0] == 0 && header[1] == 0 && header[2] == 1)
  68     {
  69         /* Check if we got a system or elementary stream start code */
  70         if (header[3] == PACK_START_CODE ||
  71             header[3] == VIDEO_ELEMENTARY_STREAM ||
  72             header[3] == AUDIO_ELEMENTARY_STREAM)
  73             return MPEG_SYSTEM_HEADER;
  74
  75         /* Check for a MPEG video sequence start code */
  76         if (header[3] == SEQUENCE_HEADER_CODE)
  77             return MPEG_VIDEO_HEADER;
  78     }
  79
  80     /* This should give a good guess if we have an MPEG audio header */
  81     if(header[0] == 0xff && ((header[1]>>5)&0x7) == 0x7 &&
  82        ((header[1]>>1)&0x3) != 0 && ((header[2]>>4)&0xf) != 0xf &&
  83        ((header[2]>>2)&0x3) != 0x3)
  84         return MPEG_AUDIO_HEADER;
  85
  86     /* Nothing yet.. */
  87     return MPEG_NO_HEADER;
  88 }
  89
  90
  91 static HRESULT MPEGSplitter_process_sample(LPVOID iface, IMediaSample * pSample)
  92 {
  93     MPEGSplitterImpl *This = (MPEGSplitterImpl*)iface;
  94     LPBYTE pbSrcStream = NULL;
  95     DWORD cbSrcStream = 0;
  96     DWORD used_bytes = 0;
  97     REFERENCE_TIME tStart, tStop;
  98     HRESULT hr;
  99     BYTE *pbDstStream;
 100     DWORD cbDstStream;
 101     long remaining_bytes = 0;
 102     Parser_OutputPin * pOutputPin;
 103     DWORD bytes_written = 0;
 104
 105     pOutputPin = (Parser_OutputPin*)This->Parser.ppPins[1];
 106
 107     hr = IMediaSample_GetTime(pSample, &tStart, &tStop);
 108     if (SUCCEEDED(hr))
 109     {
 110         cbSrcStream = IMediaSample_GetActualDataLength(pSample);
 111         hr = IMediaSample_GetPointer(pSample, &pbSrcStream);
 112     }
 113
 114     /* trace removed for performance reasons */
 115     /* TRACE("(%p), %llu -> %llu\n", pSample, tStart, tStop); */
 116
 117     if (This->pCurrentSample)
 118         bytes_written = IMediaSample_GetActualDataLength(This->pCurrentSample);
 119
 120     while (hr == S_OK && used_bytes < cbSrcStream)
 121     {
 122         remaining_bytes = (long)(This->EndOfFile - BYTES_FROM_MEDIATIME(tStart) - used_bytes);
 123         if (remaining_bytes <= 0)
 124             break;
 125
 126         if (!This->pCurrentSample)
 127         {
 128             /* cache media sample until it is ready to be despatched
 129              * (i.e. we reach the end of the chunk) */
 130             hr = OutputPin_GetDeliveryBuffer(&pOutputPin->pin, &This->pCurrentSample, NULL, NULL, 0);
 131             if (FAILED(hr))
 132             {
 133                 TRACE("Skipping sending sample due to error (%x)\n", hr);
 134                 This->pCurrentSample = NULL;
 135                 break;
 136             }
 137
 138             IMediaSample_SetTime(This->pCurrentSample, NULL, NULL);
 139             hr = IMediaSample_SetActualDataLength(This->pCurrentSample, 0);
 140             assert(hr == S_OK);
 141             bytes_written = 0;
 142         }
 143
 144         hr = IMediaSample_GetPointer(This->pCurrentSample, &pbDstStream);
 145         if (SUCCEEDED(hr))
 146         {
 147             cbDstStream = IMediaSample_GetSize(This->pCurrentSample);
 148             remaining_bytes = min(remaining_bytes, (long)(cbDstStream - bytes_written));
 149
 150             assert(remaining_bytes >= 0);
 151
 152             /* trace removed for performance reasons */
 153             /* TRACE("remaining_bytes: %d, cbSrcStream: 0x%x\n", remaining_bytes, cbSrcStream); */
 154         }
 155
 156         if (remaining_bytes <= (long)(cbSrcStream-used_bytes))
 157         {
 158             if (SUCCEEDED(hr))
 159             {
 160                 memcpy(pbDstStream + bytes_written, pbSrcStream + used_bytes, remaining_bytes);
 161                 bytes_written += remaining_bytes;
 162
 163                 hr = IMediaSample_SetActualDataLength(This->pCurrentSample, bytes_written);
 164                 assert(hr == S_OK);
 165
 166                 used_bytes += remaining_bytes;
 167             }
 168
 169             if (SUCCEEDED(hr))
 170             {
 171                 REFERENCE_TIME tMPEGStart, tMPEGStop;
 172
 173                 pOutputPin->dwSamplesProcessed = (BYTES_FROM_MEDIATIME(tStart)+used_bytes) / This->dwSampleSize;
 174
 175                 tMPEGStart = (tStart + MEDIATIME_FROM_BYTES(used_bytes-bytes_written)) /
 176                              (This->fSamplesPerSec*This->dwSampleSize);
 177                 tMPEGStop  = (tStart + MEDIATIME_FROM_BYTES(used_bytes)) /
 178                              (This->fSamplesPerSec*This->dwSampleSize);
 179
 180                 /* If the start of the sample has a valid MPEG header, it's a
 181                  * sync point */
 182                 if (MPEGSplitter_head_check(pbDstStream) == MPEG_AUDIO_HEADER)
 183                     IMediaSample_SetSyncPoint(This->pCurrentSample, TRUE);
 184                 else
 185                     IMediaSample_SetSyncPoint(This->pCurrentSample, FALSE);
 186                 IMediaSample_SetTime(This->pCurrentSample, &tMPEGStart, &tMPEGStop);
 187
 188                 hr = OutputPin_SendSample(&pOutputPin->pin, This->pCurrentSample);
 189                 if (FAILED(hr))
 190                     WARN("Error sending sample (%x)\n", hr);
 191             }
 192
 193             if (This->pCurrentSample)
 194                 IMediaSample_Release(This->pCurrentSample);
 195             This->pCurrentSample = NULL;
 196         }
 197         else
 198         {
 199             if (SUCCEEDED(hr))
 200             {
 201                 memcpy(pbDstStream + bytes_written, pbSrcStream + used_bytes, cbSrcStream - used_bytes);
 202                 bytes_written += cbSrcStream - used_bytes;
 203                 IMediaSample_SetActualDataLength(This->pCurrentSample, bytes_written);
 204
 205                 used_bytes += cbSrcStream - used_bytes;
 206             }
 207         }
 208     }
 209
 210     if (BYTES_FROM_MEDIATIME(tStop) >= This->EndOfFile)
 211     {
 212         int i;
 213
 214         TRACE("End of file reached (%d out of %d bytes used)\n", used_bytes, cbSrcStream);
 215
 216         if (This->pCurrentSample)
 217         {
 218             /* Make sure the last bit of data, if any, is sent */
 219             if (IMediaSample_GetActualDataLength(This->pCurrentSample) > 0)
 220             {
 221                 REFERENCE_TIME tMPEGStart, tMPEGStop;
 222
 223                 pOutputPin->dwSamplesProcessed = (BYTES_FROM_MEDIATIME(tStart)+used_bytes) / This->dwSampleSize;
 224
 225                 tMPEGStart = (tStart + MEDIATIME_FROM_BYTES(used_bytes-bytes_written)) /
 226                              (This->fSamplesPerSec*This->dwSampleSize);
 227                 tMPEGStop  = (tStart + MEDIATIME_FROM_BYTES(used_bytes)) /
 228                              (This->fSamplesPerSec*This->dwSampleSize);
 229
 230                 if (MPEGSplitter_head_check(pbDstStream) == MPEG_AUDIO_HEADER)
 231                     IMediaSample_SetSyncPoint(This->pCurrentSample, TRUE);
 232                 else
 233                     IMediaSample_SetSyncPoint(This->pCurrentSample, FALSE);
 234                 IMediaSample_SetTime(This->pCurrentSample, &tMPEGStart, &tMPEGStop);
 235
 236                 hr = OutputPin_SendSample(&pOutputPin->pin, This->pCurrentSample);
 237                 if (FAILED(hr))
 238                     WARN("Error sending sample (%x)\n", hr);
 239             }
 240             IMediaSample_Release(This->pCurrentSample);
 241         }
 242         This->pCurrentSample = NULL;
 243
 244         for (i = 0; i < This->Parser.cStreams; i++)
 245         {
 246             IPin* ppin;
 247             HRESULT hr;
 248
 249             TRACE("Send End Of Stream to output pin %d\n", i);
 250
 251             hr = IPin_ConnectedTo(This->Parser.ppPins[i+1], &ppin);
 252             if (SUCCEEDED(hr))
 253             {
 254                 hr = IPin_EndOfStream(ppin);
 255                 IPin_Release(ppin);
 256             }
 257             if (FAILED(hr))
 258                 WARN("Error sending EndOfStream to pin %d (%x)\n", i, hr);
 259         }
 260
 261         /* Force the pullpin thread to stop */
 262         hr = S_FALSE;
 263     }
 264
 265     return hr;
 266 }
 267
 268
 269 static HRESULT MPEGSplitter_query_accept(LPVOID iface, const AM_MEDIA_TYPE *pmt)
 270 {
 271     if (!IsEqualIID(&pmt->majortype, &MEDIATYPE_Stream))
 272         return S_FALSE;
 273
 274     if (IsEqualIID(&pmt->subtype, &MEDIASUBTYPE_MPEG1Audio))
 275         return S_OK;
 276
 277     if (IsEqualIID(&pmt->subtype, &MEDIASUBTYPE_MPEG1Video))
 278         FIXME("MPEG-1 video streams not yet supported.\n");
 279     else if (IsEqualIID(&pmt->subtype, &MEDIASUBTYPE_MPEG1System))
 280         FIXME("MPEG-1 system streams not yet supported.\n");
 281     else if (IsEqualIID(&pmt->subtype, &MEDIASUBTYPE_MPEG1VideoCD))
 282         FIXME("MPEG-1 VideoCD streams not yet supported.\n");
 283
 284     return S_FALSE;
 285 }
 286
 287
 288 static const WCHAR wszAudioStream[] = {'A','u','d','i','o',0};
 289 static const WCHAR wszVideoStream[] = {'V','i','d','e','o',0};
 290
 291 static HRESULT MPEGSplitter_init_audio(MPEGSplitterImpl *This, const BYTE *header, PIN_INFO *ppiOutput, AM_MEDIA_TYPE *pamt)
 292 {
 293     static const DWORD freqs[10] = { 44100, 48000, 32000, 22050, 24000,
 294                                      16000, 11025, 12000,  8000, 0 };
 295     static const DWORD tabsel_123[2][3][16] = {
 296         { {0,32,64,96,128,160,192,224,256,288,320,352,384,416,448,},
 297           {0,32,48,56, 64, 80, 96,112,128,160,192,224,256,320,384,},
 298           {0,32,40,48, 56, 64, 80, 96,112,128,160,192,224,256,320,} },
 299
 300         { {0,32,48,56,64,80,96,112,128,144,160,176,192,224,256,},
 301           {0,8,16,24,32,40,48,56,64,80,96,112,128,144,160,},
 302           {0,8,16,24,32,40,48,56,64,80,96,112,128,144,160,} }
 303     };
 304
 305     WAVEFORMATEX *format;
 306     int bitrate_index;
 307     int freq_index;
 308     int mode_ext;
 309     int emphasis;
 310     int padding;
 311     int lsf = 1;
 312     int mpeg1;
 313     int layer;
 314     int mode;
 315
 316     ZeroMemory(pamt, sizeof(*pamt));
 317     ppiOutput->dir = PINDIR_OUTPUT;
 318     ppiOutput->pFilter = (IBaseFilter*)This;
 319     wsprintfW(ppiOutput->achName, wszAudioStream);
 320
 321     pamt->formattype = FORMAT_WaveFormatEx;
 322     pamt->majortype = MEDIATYPE_Audio;
 323     pamt->subtype = MEDIASUBTYPE_MPEG1AudioPayload;
 324
 325     pamt->lSampleSize = 0;
 326     pamt->bFixedSizeSamples = TRUE;
 327     pamt->bTemporalCompression = 0;
 328
 329     mpeg1 = (header[1]>>4)&0x1;
 330     if (mpeg1)
 331         lsf = ((header[1]>>3)&0x1)^1;
 332
 333     layer         = 4-((header[1]>>1)&0x3);
 334     bitrate_index =   ((header[2]>>4)&0xf);
 335     freq_index    =   ((header[2]>>2)&0x3) + (mpeg1?(lsf*3):6);
 336     padding       =   ((header[2]>>1)&0x1);
 337     mode          =   ((header[3]>>6)&0x3);
 338     mode_ext      =   ((header[3]>>4)&0x3);
 339     emphasis      =   ((header[3]>>0)&0x3);
 340
 341     pamt->cbFormat = ((layer==3)? sizeof(MPEGLAYER3WAVEFORMAT) :
 342                                   sizeof(MPEG1WAVEFORMAT));
 343     pamt->pbFormat = CoTaskMemAlloc(pamt->cbFormat);
 344     if (!pamt->pbFormat)
 345         return E_OUTOFMEMORY;
 346     ZeroMemory(pamt->pbFormat, pamt->cbFormat);
 347     format = (WAVEFORMATEX*)pamt->pbFormat;
 348
 349     format->wFormatTag      = ((layer == 3) ? WAVE_FORMAT_MPEGLAYER3 :
 350                                               WAVE_FORMAT_MPEG);
 351     format->nChannels       = ((mode == 3) ? 1 : 2);
 352     format->nSamplesPerSec  = freqs[freq_index];
 353     format->nAvgBytesPerSec = tabsel_123[lsf][layer-1][bitrate_index] * 1000 / 8;
 354     if (format->nAvgBytesPerSec == 0)
 355     {
 356         WARN("Variable-bitrate audio is not supported.\n");
 357         return E_FAIL;
 358     }
 359
 360     if (layer == 3)
 361         format->nBlockAlign = format->nAvgBytesPerSec * 8 * 144 /
 362                               (format->nSamplesPerSec<<lsf) +
 363                               (padding - 4);
 364     else if (layer == 2)
 365         format->nBlockAlign = format->nAvgBytesPerSec * 8 * 144 /
 366                               format->nSamplesPerSec + (padding - 4);
 367     else
 368         format->nBlockAlign = ((format->nAvgBytesPerSec * 8 * 12 /
 369                                 format->nSamplesPerSec + padding) << 2) - 4;
 370
 371     format->wBitsPerSample = 0;
 372
 373     if (layer == 3)
 374     {
 375         MPEGLAYER3WAVEFORMAT *mp3format = (MPEGLAYER3WAVEFORMAT*)format;
 376
 377         format->cbSize = MPEGLAYER3_WFX_EXTRA_BYTES;
 378
 379         mp3format->wID = MPEGLAYER3_ID_MPEG;
 380         mp3format->fdwFlags = (padding ?
 381                                MPEGLAYER3_FLAG_PADDING_OFF :
 382                                MPEGLAYER3_FLAG_PADDING_ON);
 383         mp3format->nBlockSize = format->nBlockAlign;
 384         mp3format->nFramesPerBlock = 1;
 385
 386         /* Beware the evil magic numbers. This struct is apparently horribly
 387          * under-documented, and the only references I could find had it being
 388          * set to this with no real explanation. It works fine though, so I'm
 389          * not complaining (yet).
 390          */
 391         mp3format->nCodecDelay = 1393;
 392     }
 393     else
 394     {
 395         MPEG1WAVEFORMAT *mpgformat = (MPEG1WAVEFORMAT*)format;
 396
 397         format->cbSize = 22;
 398
 399         mpgformat->fwHeadLayer   = ((layer == 1) ? ACM_MPEG_LAYER1 :
 400                                     ((layer == 2) ? ACM_MPEG_LAYER2 :
 401                                      ACM_MPEG_LAYER3));
 402         mpgformat->dwHeadBitrate = format->nAvgBytesPerSec * 8;
 403         mpgformat->fwHeadMode    = ((mode == 3) ? ACM_MPEG_SINGLECHANNEL :
 404                                     ((mode == 2) ? ACM_MPEG_DUALCHANNEL :
 405                                      ((mode == 1) ? ACM_MPEG_JOINTSTEREO :
 406                                       ACM_MPEG_STEREO)));
 407         mpgformat->fwHeadModeExt = ((mode == 1) ? 0x0F : (1<<mode_ext));
 408         mpgformat->wHeadEmphasis = emphasis + 1;
 409         mpgformat->fwHeadFlags   = ACM_MPEG_ID_MPEG1;
 410     }
 411     pamt->subtype.Data1 = format->wFormatTag;
 412
 413     TRACE("MPEG audio stream detected:\n"
 414           "\tLayer %d (%#x)\n"
 415           "\tFrequency: %d\n"
 416           "\tChannels: %d (%d)\n"
 417           "\tBytesPerSec: %d\n",
 418           layer, format->wFormatTag, format->nSamplesPerSec,
 419           format->nChannels, mode, format->nAvgBytesPerSec);
 420
 421     dump_AM_MEDIA_TYPE(pamt);
 422
 423     return S_OK;
 424 }
 425
 426
 427 static HRESULT MPEGSplitter_pre_connect(IPin *iface, IPin *pConnectPin)
 428 {
 429     PullPin *pPin = (PullPin *)iface;
 430     MPEGSplitterImpl *This = (MPEGSplitterImpl*)pPin->pin.pinInfo.pFilter;
 431     ALLOCATOR_PROPERTIES props;
 432     HRESULT hr;
 433     LONGLONG pos = 0; /* in bytes */
 434     BYTE header[10];
 435     int streamtype = 0;
 436     LONGLONG total, avail;
 437     AM_MEDIA_TYPE amt;
 438     PIN_INFO piOutput;
 439
 440     IAsyncReader_Length(pPin->pReader, &total, &avail);
 441     This->EndOfFile = total;
 442
 443     hr = IAsyncReader_SyncRead(pPin->pReader, pos, 4, header);
 444     if (SUCCEEDED(hr))
 445         pos += 4;
 446
 447     /* Skip ID3 v2 tag, if any */
 448     if (SUCCEEDED(hr) && !strncmp("ID3", (char*)header, 3))
 449     do {
 450         UINT length;
 451         hr = IAsyncReader_SyncRead(pPin->pReader, pos, 6, header + 4);
 452         if (FAILED(hr))
 453             break;
 454         pos += 6;
 455         TRACE("Found ID3 v2.%d.%d\n", header[3], header[4]);
 456         length  = (header[6] & 0x7F) << 21;
 457         length += (header[7] & 0x7F) << 14;
 458         length += (header[8] & 0x7F) << 7;
 459         length += (header[9] & 0x7F);
 460         TRACE("Length: %u\n", length);
 461         pos += length;
 462
 463         /* Read the real header for the mpeg splitter */
 464         hr = IAsyncReader_SyncRead(pPin->pReader, pos, 4, header);
 465         if (SUCCEEDED(hr))
 466             pos += 4;
 467         TRACE("%x:%x:%x:%x\n", header[0], header[1], header[2], header[3]);
 468     } while (0);
 469
 470     while(SUCCEEDED(hr) && !(streamtype=MPEGSplitter_head_check(header)))
 471     {
 472         TRACE("%x:%x:%x:%x\n", header[0], header[1], header[2], header[3]);
 473         /* No valid header yet; shift by a byte and check again */
 474         memcpy(header, header+1, 3);
 475         hr = IAsyncReader_SyncRead(pPin->pReader, pos++, 1, header + 3);
 476     }
 477     if (FAILED(hr))
 478         return hr;
 479
 480     switch(streamtype)
 481     {
 482         case MPEG_AUDIO_HEADER:
 483             hr = MPEGSplitter_init_audio(This, header, &piOutput, &amt);
 484             if (SUCCEEDED(hr))
 485             {
 486                 WAVEFORMATEX *format = (WAVEFORMATEX*)amt.pbFormat;
 487
 488                 props.cbAlign = 1;
 489                 props.cbPrefix = 0;
 490                 /* Make the output buffer a multiple of the frame size */
 491                 props.cbBuffer = 0x4000 / format->nBlockAlign *
 492                                  format->nBlockAlign;
 493                 props.cBuffers = 1;
 494                 This->fSamplesPerSec = (float)format->nAvgBytesPerSec / (float)format->nBlockAlign;
 495                 This->dwSampleSize = format->nBlockAlign;
 496                 This->dwLength = total;
 497                 hr = Parser_AddPin(&(This->Parser), &piOutput, &props, &amt);
 498             }
 499
 500             if (FAILED(hr))
 501             {
 502                 if (amt.pbFormat)
 503                     CoTaskMemFree(amt.pbFormat);
 504                 ERR("Could not create pin for MPEG audio stream (%x)\n", hr);
 505             }
 506             break;
 507         case MPEG_VIDEO_HEADER:
 508             FIXME("MPEG video processing not yet supported!\n");
 509             hr = E_FAIL;
 510             break;
 511         case MPEG_SYSTEM_HEADER:
 512             FIXME("MPEG system streams not yet supported!\n");
 513             hr = E_FAIL;
 514             break;
 515
 516         default:
 517             break;
 518     }
 519
 520     return hr;
 521 }
 522
 523 static HRESULT MPEGSplitter_cleanup(LPVOID iface)
 524 {
 525     MPEGSplitterImpl *This = (MPEGSplitterImpl*)iface;
 526
 527     TRACE("(%p)->()\n", This);
 528
 529     if (This->pCurrentSample)
 530         IMediaSample_Release(This->pCurrentSample);
 531     This->pCurrentSample = NULL;
 532
 533     return S_OK;
 534 }
 535
 536 HRESULT MPEGSplitter_create(IUnknown * pUnkOuter, LPVOID * ppv)
 537 {
 538     MPEGSplitterImpl *This;
 539     HRESULT hr = E_FAIL;
 540
 541     TRACE("(%p, %p)\n", pUnkOuter, ppv);
 542
 543     *ppv = NULL;
 544
 545     if (pUnkOuter)
 546         return CLASS_E_NOAGGREGATION;
 547
 548     This = CoTaskMemAlloc(sizeof(MPEGSplitterImpl));
 549     if (!This)
 550         return E_OUTOFMEMORY;
 551
 552     ZeroMemory(This, sizeof(MPEGSplitterImpl));
 553     hr = Parser_Create(&(This->Parser), &CLSID_MPEG1Splitter, MPEGSplitter_process_sample, MPEGSplitter_query_accept, MPEGSplitter_pre_connect, MPEGSplitter_cleanup);
 554     if (FAILED(hr))
 555     {
 556         CoTaskMemFree(This);
 557         return hr;
 558     }
 559
 560     /* Note: This memory is managed by the parser filter once created */
 561     *ppv = (LPVOID)This;
 562
 563     return hr;
 564 }