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
  56 typedef struct MPEGSplitterImpl
  57 {
  58     ParserImpl Parser;
  59     IMediaSample *pCurrentSample;
  60     LONGLONG EndOfFile;
  61 } MPEGSplitterImpl;
  62
  63 static int MPEGSplitter_head_check(const BYTE *header)
  64 {
  65     /* If this is a possible start code, check for a system or video header */
  66     if (header[0] == 0 && header[1] == 0 && header[2] == 1)
  67     {
  68         /* Check if we got a system or elementary stream start code */
  69         if (header[3] == PACK_START_CODE ||
  70             header[3] == VIDEO_ELEMENTARY_STREAM ||
  71             header[3] == AUDIO_ELEMENTARY_STREAM)
  72             return MPEG_SYSTEM_HEADER;
  73
  74         /* Check for a MPEG video sequence start code */
  75         if (header[3] == SEQUENCE_HEADER_CODE)
  76             return MPEG_VIDEO_HEADER;
  77     }
  78
  79     /* This should give a good guess if we have an MPEG audio header */
  80     if(header[0] == 0xff && ((header[1]>>5)&0x7) == 0x7 &&
  81        ((header[1]>>1)&0x3) != 0 && ((header[2]>>4)&0xf) != 0xf &&
  82        ((header[2]>>2)&0x3) != 0x3)
  83         return MPEG_AUDIO_HEADER;
  84
  85     /* Nothing yet.. */
  86     return MPEG_NO_HEADER;
  87 }
  88
  89
  90 static HRESULT MPEGSplitter_process_sample(LPVOID iface, IMediaSample * pSample)
  91 {
  92     MPEGSplitterImpl *This = (MPEGSplitterImpl*)iface;
  93     LPBYTE pbSrcStream = NULL;
  94     DWORD cbSrcStream = 0;
  95     DWORD used_bytes = 0;
  96     REFERENCE_TIME tStart, tStop;
  97     HRESULT hr;
  98     BYTE *pbDstStream;
  99     DWORD cbDstStream;
 100     long remaining_bytes = 0;
 101     Parser_OutputPin * pOutputPin;
 102     DWORD bytes_written = 0;
 103
 104     pOutputPin = (Parser_OutputPin*)This->Parser.ppPins[1];
 105
 106     hr = IMediaSample_GetTime(pSample, &tStart, &tStop);
 107     if (SUCCEEDED(hr))
 108     {
 109         cbSrcStream = IMediaSample_GetActualDataLength(pSample);
 110         hr = IMediaSample_GetPointer(pSample, &pbSrcStream);
 111     }
 112
 113     /* trace removed for performance reasons */
 114     /* TRACE("(%p), %llu -> %llu\n", pSample, tStart, tStop); */
 115
 116     if (This->pCurrentSample)
 117         bytes_written = IMediaSample_GetActualDataLength(This->pCurrentSample);
 118
 119     while (hr == S_OK && used_bytes < cbSrcStream)
 120     {
 121         remaining_bytes = (long)(This->EndOfFile - BYTES_FROM_MEDIATIME(tStart) - used_bytes);
 122         if (remaining_bytes <= 0)
 123             break;
 124
 125         if (!This->pCurrentSample)
 126         {
 127             /* cache media sample until it is ready to be despatched
 128              * (i.e. we reach the end of the chunk) */
 129             hr = OutputPin_GetDeliveryBuffer(&pOutputPin->pin, &This->pCurrentSample, NULL, NULL, 0);
 130             if (FAILED(hr))
 131             {
 132                 TRACE("Skipping sending sample due to error (%x)\n", hr);
 133                 This->pCurrentSample = NULL;
 134                 break;
 135             }
 136
 137             IMediaSample_SetTime(This->pCurrentSample, NULL, NULL);
 138             hr = IMediaSample_SetActualDataLength(This->pCurrentSample, 0);
 139             assert(hr == S_OK);
 140             bytes_written = 0;
 141         }
 142
 143         hr = IMediaSample_GetPointer(This->pCurrentSample, &pbDstStream);
 144         if (SUCCEEDED(hr))
 145         {
 146             cbDstStream = IMediaSample_GetSize(This->pCurrentSample);
 147             remaining_bytes = min(remaining_bytes, (long)(cbDstStream - bytes_written));
 148
 149             assert(remaining_bytes >= 0);
 150
 151             /* trace removed for performance reasons */
 152             /* TRACE("remaining_bytes: %d, cbSrcStream: 0x%x\n", remaining_bytes, cbSrcStream); */
 153         }
 154
 155         if (remaining_bytes <= (long)(cbSrcStream-used_bytes))
 156         {
 157             if (SUCCEEDED(hr))
 158             {
 159                 memcpy(pbDstStream + bytes_written, pbSrcStream + used_bytes, remaining_bytes);
 160                 bytes_written += remaining_bytes;
 161
 162                 hr = IMediaSample_SetActualDataLength(This->pCurrentSample, bytes_written);
 163                 assert(hr == S_OK);
 164
 165                 used_bytes += remaining_bytes;
 166             }
 167
 168             if (SUCCEEDED(hr))
 169             {
 170                 REFERENCE_TIME tMPEGStart, tMPEGStop;
 171
 172                 pOutputPin->dwSamplesProcessed = (BYTES_FROM_MEDIATIME(tStart)+used_bytes) / pOutputPin->dwSampleSize;
 173
 174                 tMPEGStart = (tStart + MEDIATIME_FROM_BYTES(used_bytes-bytes_written)) /
 175                              (pOutputPin->fSamplesPerSec*pOutputPin->dwSampleSize);
 176                 tMPEGStop  = (tStart + MEDIATIME_FROM_BYTES(used_bytes)) /
 177                              (pOutputPin->fSamplesPerSec*pOutputPin->dwSampleSize);
 178
 179                 /* If the start of the sample has a valid MPEG header, it's a
 180                  * sync point */
 181                 if (MPEGSplitter_head_check(pbDstStream) == MPEG_AUDIO_HEADER)
 182                     IMediaSample_SetSyncPoint(This->pCurrentSample, TRUE);
 183                 else
 184                     IMediaSample_SetSyncPoint(This->pCurrentSample, FALSE);
 185                 IMediaSample_SetTime(This->pCurrentSample, &tMPEGStart, &tMPEGStop);
 186
 187                 hr = OutputPin_SendSample(&pOutputPin->pin, This->pCurrentSample);
 188                 if (FAILED(hr))
 189                     WARN("Error sending sample (%x)\n", hr);
 190             }
 191
 192             if (This->pCurrentSample)
 193                 IMediaSample_Release(This->pCurrentSample);
 194             This->pCurrentSample = NULL;
 195         }
 196         else
 197         {
 198             if (SUCCEEDED(hr))
 199             {
 200                 memcpy(pbDstStream + bytes_written, pbSrcStream + used_bytes, cbSrcStream - used_bytes);
 201                 bytes_written += cbSrcStream - used_bytes;
 202                 IMediaSample_SetActualDataLength(This->pCurrentSample, bytes_written);
 203
 204                 used_bytes += cbSrcStream - used_bytes;
 205             }
 206         }
 207     }
 208
 209     if (BYTES_FROM_MEDIATIME(tStop) >= This->EndOfFile)
 210     {
 211         int i;
 212
 213         TRACE("End of file reached (%d out of %d bytes used)\n", used_bytes, cbSrcStream);
 214
 215         if (This->pCurrentSample)
 216         {
 217             /* Make sure the last bit of data, if any, is sent */
 218             if (IMediaSample_GetActualDataLength(This->pCurrentSample) > 0)
 219             {
 220                 REFERENCE_TIME tMPEGStart, tMPEGStop;
 221
 222                 pOutputPin->dwSamplesProcessed = (BYTES_FROM_MEDIATIME(tStart)+used_bytes) / pOutputPin->dwSampleSize;
 223
 224                 tMPEGStart = (tStart + MEDIATIME_FROM_BYTES(used_bytes-bytes_written)) /
 225                              (pOutputPin->fSamplesPerSec*pOutputPin->dwSampleSize);
 226                 tMPEGStop  = (tStart + MEDIATIME_FROM_BYTES(used_bytes)) /
 227                              (pOutputPin->fSamplesPerSec*pOutputPin->dwSampleSize);
 228
 229                 if (MPEGSplitter_head_check(pbDstStream) == MPEG_AUDIO_HEADER)
 230                     IMediaSample_SetSyncPoint(This->pCurrentSample, TRUE);
 231                 else
 232                     IMediaSample_SetSyncPoint(This->pCurrentSample, FALSE);
 233                 IMediaSample_SetTime(This->pCurrentSample, &tMPEGStart, &tMPEGStop);
 234
 235                 hr = OutputPin_SendSample(&pOutputPin->pin, This->pCurrentSample);
 236                 if (FAILED(hr))
 237                     WARN("Error sending sample (%x)\n", hr);
 238             }
 239             IMediaSample_Release(This->pCurrentSample);
 240         }
 241         This->pCurrentSample = NULL;
 242
 243         for (i = 0; i < This->Parser.cStreams; i++)
 244         {
 245             IPin* ppin;
 246             HRESULT hr;
 247
 248             TRACE("Send End Of Stream to output pin %d\n", i);
 249
 250             hr = IPin_ConnectedTo(This->Parser.ppPins[i+1], &ppin);
 251             if (SUCCEEDED(hr))
 252             {
 253                 hr = IPin_EndOfStream(ppin);
 254                 IPin_Release(ppin);
 255             }
 256             if (FAILED(hr))
 257                 WARN("Error sending EndOfStream to pin %d (%x)\n", i, hr);
 258         }
 259
 260         /* Force the pullpin thread to stop */
 261         hr = S_FALSE;
 262     }
 263
 264     return hr;
 265 }
 266
 267
 268 static HRESULT MPEGSplitter_query_accept(LPVOID iface, const AM_MEDIA_TYPE *pmt)
 269 {
 270     if (!IsEqualIID(&pmt->majortype, &MEDIATYPE_Stream))
 271         return S_FALSE;
 272
 273     if (IsEqualIID(&pmt->subtype, &MEDIASUBTYPE_MPEG1Audio))
 274         return S_OK;
 275
 276     if (IsEqualIID(&pmt->subtype, &MEDIASUBTYPE_MPEG1Video))
 277         FIXME("MPEG-1 video streams not yet supported.\n");
 278     else if (IsEqualIID(&pmt->subtype, &MEDIASUBTYPE_MPEG1System))
 279         FIXME("MPEG-1 system streams not yet supported.\n");
 280     else if (IsEqualIID(&pmt->subtype, &MEDIASUBTYPE_MPEG1VideoCD))
 281         FIXME("MPEG-1 VideoCD streams not yet supported.\n");
 282
 283     return S_FALSE;
 284 }
 285
 286
 287 static const WCHAR wszAudioStream[] = {'A','u','d','i','o',0};
 288 static const WCHAR wszVideoStream[] = {'V','i','d','e','o',0};
 289
 290 static HRESULT MPEGSplitter_init_audio(MPEGSplitterImpl *This, const BYTE *header, PIN_INFO *ppiOutput, AM_MEDIA_TYPE *pamt)
 291 {
 292     static const DWORD freqs[10] = { 44100, 48000, 32000, 22050, 24000,
 293                                      16000, 11025, 12000,  8000, 0 };
 294     static const DWORD tabsel_123[2][3][16] = {
 295         { {0,32,64,96,128,160,192,224,256,288,320,352,384,416,448,},
 296           {0,32,48,56, 64, 80, 96,112,128,160,192,224,256,320,384,},
 297           {0,32,40,48, 56, 64, 80, 96,112,128,160,192,224,256,320,} },
 298
 299         { {0,32,48,56,64,80,96,112,128,144,160,176,192,224,256,},
 300           {0,8,16,24,32,40,48,56,64,80,96,112,128,144,160,},
 301           {0,8,16,24,32,40,48,56,64,80,96,112,128,144,160,} }
 302     };
 303
 304     WAVEFORMATEX *format;
 305     int bitrate_index;
 306     int freq_index;
 307     int mode_ext;
 308     int emphasis;
 309     int padding;
 310     int lsf = 1;
 311     int mpeg1;
 312     int layer;
 313     int mode;
 314
 315     ZeroMemory(pamt, sizeof(*pamt));
 316     ppiOutput->dir = PINDIR_OUTPUT;
 317     ppiOutput->pFilter = (IBaseFilter*)This;
 318     wsprintfW(ppiOutput->achName, wszAudioStream);
 319
 320     pamt->formattype = FORMAT_WaveFormatEx;
 321     pamt->majortype = MEDIATYPE_Audio;
 322     pamt->subtype = MEDIASUBTYPE_MPEG1AudioPayload;
 323
 324     pamt->lSampleSize = 0;
 325     pamt->bFixedSizeSamples = TRUE;
 326     pamt->bTemporalCompression = 0;
 327
 328     mpeg1 = (header[1]>>4)&0x1;
 329     if (mpeg1)
 330         lsf = ((header[1]>>3)&0x1)^1;
 331
 332     layer         = 4-((header[1]>>1)&0x3);
 333     bitrate_index =   ((header[2]>>4)&0xf);
 334     freq_index    =   ((header[2]>>2)&0x3) + (mpeg1?(lsf*3):6);
 335     padding       =   ((header[2]>>1)&0x1);
 336     mode          =   ((header[3]>>6)&0x3);
 337     mode_ext      =   ((header[3]>>4)&0x3);
 338     emphasis      =   ((header[3]>>0)&0x3);
 339
 340     pamt->cbFormat = ((layer==3)? sizeof(MPEGLAYER3WAVEFORMAT) :
 341                                   sizeof(MPEG1WAVEFORMAT));
 342     pamt->pbFormat = CoTaskMemAlloc(pamt->cbFormat);
 343     if (!pamt->pbFormat)
 344         return E_OUTOFMEMORY;
 345     ZeroMemory(pamt->pbFormat, pamt->cbFormat);
 346     format = (WAVEFORMATEX*)pamt->pbFormat;
 347
 348     format->wFormatTag      = ((layer == 3) ? WAVE_FORMAT_MPEGLAYER3 :
 349                                               WAVE_FORMAT_MPEG);
 350     format->nChannels       = ((mode == 3) ? 1 : 2);
 351     format->nSamplesPerSec  = freqs[freq_index];
 352     format->nAvgBytesPerSec = tabsel_123[lsf][layer-1][bitrate_index] * 1000 / 8;
 353     if (format->nAvgBytesPerSec == 0)
 354     {
 355         WARN("Variable-bitrate audio is not supported.\n");
 356         return E_FAIL;
 357     }
 358
 359     if (layer == 3)
 360         format->nBlockAlign = format->nAvgBytesPerSec * 8 * 144 /
 361                               (format->nSamplesPerSec<<lsf) +
 362                               (padding - 4);
 363     else if (layer == 2)
 364         format->nBlockAlign = format->nAvgBytesPerSec * 8 * 144 /
 365                               format->nSamplesPerSec + (padding - 4);
 366     else
 367         format->nBlockAlign = ((format->nAvgBytesPerSec * 8 * 12 /
 368                                 format->nSamplesPerSec + padding) << 2) - 4;
 369
 370     format->wBitsPerSample = 0;
 371
 372     if (layer == 3)
 373     {
 374         MPEGLAYER3WAVEFORMAT *mp3format = (MPEGLAYER3WAVEFORMAT*)format;
 375
 376         format->cbSize = MPEGLAYER3_WFX_EXTRA_BYTES;
 377
 378         mp3format->wID = MPEGLAYER3_ID_MPEG;
 379         mp3format->fdwFlags = (padding ?
 380                                MPEGLAYER3_FLAG_PADDING_OFF :
 381                                MPEGLAYER3_FLAG_PADDING_ON);
 382         mp3format->nBlockSize = format->nBlockAlign;
 383         mp3format->nFramesPerBlock = 1;
 384
 385         /* Beware the evil magic numbers. This struct is apparently horribly
 386          * under-documented, and the only references I could find had it being
 387          * set to this with no real explanation. It works fine though, so I'm
 388          * not complaining (yet).
 389          */
 390         mp3format->nCodecDelay = 1393;
 391     }
 392     else
 393     {
 394         MPEG1WAVEFORMAT *mpgformat = (MPEG1WAVEFORMAT*)format;
 395
 396         format->cbSize = 22;
 397
 398         mpgformat->fwHeadLayer   = ((layer == 1) ? ACM_MPEG_LAYER1 :
 399                                     ((layer == 2) ? ACM_MPEG_LAYER2 :
 400                                      ACM_MPEG_LAYER3));
 401         mpgformat->dwHeadBitrate = format->nAvgBytesPerSec * 8;
 402         mpgformat->fwHeadMode    = ((mode == 3) ? ACM_MPEG_SINGLECHANNEL :
 403                                     ((mode == 2) ? ACM_MPEG_DUALCHANNEL :
 404                                      ((mode == 1) ? ACM_MPEG_JOINTSTEREO :
 405                                       ACM_MPEG_STEREO)));
 406         mpgformat->fwHeadModeExt = ((mode == 1) ? 0x0F : (1<<mode_ext));
 407         mpgformat->wHeadEmphasis = emphasis + 1;
 408         mpgformat->fwHeadFlags   = ACM_MPEG_ID_MPEG1;
 409     }
 410     pamt->subtype.Data1 = format->wFormatTag;
 411
 412     TRACE("MPEG audio stream detected:\n"
 413           "\tLayer %d (%#x)\n"
 414           "\tFrequency: %d\n"
 415           "\tChannels: %d (%d)\n"
 416           "\tBytesPerSec: %d\n",
 417           layer, format->wFormatTag, format->nSamplesPerSec,
 418           format->nChannels, mode, format->nAvgBytesPerSec);
 419
 420     dump_AM_MEDIA_TYPE(pamt);
 421
 422     return S_OK;
 423 }
 424
 425
 426 static HRESULT MPEGSplitter_pre_connect(IPin *iface, IPin *pConnectPin)
 427 {
 428     PullPin *pPin = (PullPin *)iface;
 429     MPEGSplitterImpl *This = (MPEGSplitterImpl*)pPin->pin.pinInfo.pFilter;
 430     ALLOCATOR_PROPERTIES props;
 431     HRESULT hr;
 432     LONGLONG pos = 0; /* in bytes */
 433     BYTE header[10];
 434     int streamtype = 0;
 435     LONGLONG total, avail;
 436     AM_MEDIA_TYPE amt;
 437     PIN_INFO piOutput;
 438
 439     IAsyncReader_Length(pPin->pReader, &total, &avail);
 440     This->EndOfFile = total;
 441
 442     hr = IAsyncReader_SyncRead(pPin->pReader, pos, 4, header);
 443     if (SUCCEEDED(hr))
 444         pos += 4;
 445
 446     /* Skip ID3 v2 tag, if any */
 447     if (SUCCEEDED(hr) && !strncmp("ID3", (char*)header, 3))
 448     do {
 449         UINT length;
 450         hr = IAsyncReader_SyncRead(pPin->pReader, pos, 6, header + 4);
 451         if (FAILED(hr))
 452             break;
 453         pos += 6;
 454         TRACE("Found ID3 v2.%d.%d\n", header[3], header[4]);
 455         length  = (header[6] & 0x7F) << 21;
 456         length += (header[7] & 0x7F) << 14;
 457         length += (header[8] & 0x7F) << 7;
 458         length += (header[9] & 0x7F);
 459         TRACE("Length: %u\n", length);
 460         pos += length;
 461
 462         /* Read the real header for the mpeg splitter */
 463         hr = IAsyncReader_SyncRead(pPin->pReader, pos, 4, header);
 464         if (SUCCEEDED(hr))
 465             pos += 4;
 466         TRACE("%x:%x:%x:%x\n", header[0], header[1], header[2], header[3]);
 467     } while (0);
 468
 469     while(SUCCEEDED(hr) && !(streamtype=MPEGSplitter_head_check(header)))
 470     {
 471         TRACE("%x:%x:%x:%x\n", header[0], header[1], header[2], header[3]);
 472         /* No valid header yet; shift by a byte and check again */
 473         memcpy(header, header+1, 3);
 474         hr = IAsyncReader_SyncRead(pPin->pReader, pos++, 1, header + 3);
 475     }
 476     if (FAILED(hr))
 477         return hr;
 478
 479     switch(streamtype)
 480     {
 481         case MPEG_AUDIO_HEADER:
 482             hr = MPEGSplitter_init_audio(This, header, &piOutput, &amt);
 483             if (SUCCEEDED(hr))
 484             {
 485                 WAVEFORMATEX *format = (WAVEFORMATEX*)amt.pbFormat;
 486
 487                 props.cbAlign = 1;
 488                 props.cbPrefix = 0;
 489                 /* Make the output buffer a multiple of the frame size */
 490                 props.cbBuffer = 0x4000 / format->nBlockAlign *
 491                                  format->nBlockAlign;
 492                 props.cBuffers = 1;
 493
 494                 hr = Parser_AddPin(&(This->Parser), &piOutput, &props, &amt,
 495                                    (float)format->nAvgBytesPerSec /
 496                                     (float)format->nBlockAlign,
 497                                    format->nBlockAlign,
 498                                    total);
 499             }
 500
 501             if (FAILED(hr))
 502             {
 503                 if (amt.pbFormat)
 504                     CoTaskMemFree(amt.pbFormat);
 505                 ERR("Could not create pin for MPEG audio stream (%x)\n", hr);
 506             }
 507             break;
 508         case MPEG_VIDEO_HEADER:
 509             FIXME("MPEG video processing not yet supported!\n");
 510             hr = E_FAIL;
 511             break;
 512         case MPEG_SYSTEM_HEADER:
 513             FIXME("MPEG system streams not yet supported!\n");
 514             hr = E_FAIL;
 515             break;
 516
 517         default:
 518             break;
 519     }
 520
 521     return hr;
 522 }
 523
 524 static HRESULT MPEGSplitter_cleanup(LPVOID iface)
 525 {
 526     MPEGSplitterImpl *This = (MPEGSplitterImpl*)iface;
 527
 528     TRACE("(%p)->()\n", This);
 529
 530     if (This->pCurrentSample)
 531         IMediaSample_Release(This->pCurrentSample);
 532     This->pCurrentSample = NULL;
 533
 534     return S_OK;
 535 }
 536
 537 HRESULT MPEGSplitter_create(IUnknown * pUnkOuter, LPVOID * ppv)
 538 {
 539     MPEGSplitterImpl *This;
 540     HRESULT hr = E_FAIL;
 541
 542     TRACE("(%p, %p)\n", pUnkOuter, ppv);
 543
 544     *ppv = NULL;
 545
 546     if (pUnkOuter)
 547         return CLASS_E_NOAGGREGATION;
 548
 549     This = CoTaskMemAlloc(sizeof(MPEGSplitterImpl));
 550     if (!This)
 551         return E_OUTOFMEMORY;
 552
 553     ZeroMemory(This, sizeof(MPEGSplitterImpl));
 554     hr = Parser_Create(&(This->Parser), &CLSID_MPEG1Splitter, MPEGSplitter_process_sample, MPEGSplitter_query_accept, MPEGSplitter_pre_connect, MPEGSplitter_cleanup);
 555     if (FAILED(hr))
 556     {
 557         CoTaskMemFree(This);
 558         return hr;
 559     }
 560
 561     /* Note: This memory is managed by the parser filter once created */
 562     *ppv = (LPVOID)This;
 563
 564     return hr;
 565 }