libavdevice/dshow.c

   1 /*
   2  * Directshow capture interface
   3  * Copyright (c) 2010 Ramiro Polla
   4  *
   5  * This file is part of FFmpeg.
   6  *
   7  * FFmpeg is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * FFmpeg is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with FFmpeg; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 #include "dshow_capture.h"
  23 #include "libavutil/parseutils.h"
  24 #include "libavutil/pixdesc.h"
  25 #include "libavutil/opt.h"
  26 #include "libavformat/internal.h"
  27 #include "libavformat/riff.h"
  28 #include "avdevice.h"
  29 #include "libavcodec/raw.h"
  30 #include "objidl.h"
  31 #include "shlwapi.h"
  32
  33
  34 static enum AVPixelFormat dshow_pixfmt(DWORD biCompression, WORD biBitCount)
  35 {
  36     switch(biCompression) {
  37     case BI_BITFIELDS:
  38     case BI_RGB:
  39         switch(biBitCount) { /* 1-8 are untested */
  40             case 1:
  41                 return AV_PIX_FMT_MONOWHITE;
  42             case 4:
  43                 return AV_PIX_FMT_RGB4;
  44             case 8:
  45                 return AV_PIX_FMT_RGB8;
  46             case 16:
  47                 return AV_PIX_FMT_RGB555;
  48             case 24:
  49                 return AV_PIX_FMT_BGR24;
  50             case 32:
  51                 return AV_PIX_FMT_0RGB32;
  52         }
  53     }
  54     return avpriv_find_pix_fmt(avpriv_get_raw_pix_fmt_tags(), biCompression); // all others
  55 }
  56
  57 static int
  58 dshow_read_close(AVFormatContext *s)
  59 {
  60     struct dshow_ctx *ctx = s->priv_data;
  61     AVPacketList *pktl;
  62
  63     if (ctx->control) {
  64         IMediaControl_Stop(ctx->control);
  65         IMediaControl_Release(ctx->control);
  66     }
  67
  68     if (ctx->media_event)
  69         IMediaEvent_Release(ctx->media_event);
  70
  71     if (ctx->graph) {
  72         IEnumFilters *fenum;
  73         int r;
  74         r = IGraphBuilder_EnumFilters(ctx->graph, &fenum);
  75         if (r == S_OK) {
  76             IBaseFilter *f;
  77             IEnumFilters_Reset(fenum);
  78             while (IEnumFilters_Next(fenum, 1, &f, NULL) == S_OK) {
  79                 if (IGraphBuilder_RemoveFilter(ctx->graph, f) == S_OK)
  80                     IEnumFilters_Reset(fenum); /* When a filter is removed,
  81                                                 * the list must be reset. */
  82                 IBaseFilter_Release(f);
  83             }
  84             IEnumFilters_Release(fenum);
  85         }
  86         IGraphBuilder_Release(ctx->graph);
  87     }
  88
  89     if (ctx->capture_pin[VideoDevice])
  90         libAVPin_Release(ctx->capture_pin[VideoDevice]);
  91     if (ctx->capture_pin[AudioDevice])
  92         libAVPin_Release(ctx->capture_pin[AudioDevice]);
  93     if (ctx->capture_filter[VideoDevice])
  94         libAVFilter_Release(ctx->capture_filter[VideoDevice]);
  95     if (ctx->capture_filter[AudioDevice])
  96         libAVFilter_Release(ctx->capture_filter[AudioDevice]);
  97
  98     if (ctx->device_pin[VideoDevice])
  99         IPin_Release(ctx->device_pin[VideoDevice]);
 100     if (ctx->device_pin[AudioDevice])
 101         IPin_Release(ctx->device_pin[AudioDevice]);
 102     if (ctx->device_filter[VideoDevice])
 103         IBaseFilter_Release(ctx->device_filter[VideoDevice]);
 104     if (ctx->device_filter[AudioDevice])
 105         IBaseFilter_Release(ctx->device_filter[AudioDevice]);
 106
 107     av_freep(&ctx->device_name[0]);
 108     av_freep(&ctx->device_name[1]);
 109     av_freep(&ctx->device_unique_name[0]);
 110     av_freep(&ctx->device_unique_name[1]);
 111
 112     if(ctx->mutex)
 113         CloseHandle(ctx->mutex);
 114     if(ctx->event[0])
 115         CloseHandle(ctx->event[0]);
 116     if(ctx->event[1])
 117         CloseHandle(ctx->event[1]);
 118
 119     pktl = ctx->pktl;
 120     while (pktl) {
 121         AVPacketList *next = pktl->next;
 122         av_packet_unref(&pktl->pkt);
 123         av_free(pktl);
 124         pktl = next;
 125     }
 126
 127     CoUninitialize();
 128
 129     return 0;
 130 }
 131
 132 static char *dup_wchar_to_utf8(wchar_t *w)
 133 {
 134     char *s = NULL;
 135     int l = WideCharToMultiByte(CP_UTF8, 0, w, -1, 0, 0, 0, 0);
 136     s = av_malloc(l);
 137     if (s)
 138         WideCharToMultiByte(CP_UTF8, 0, w, -1, s, l, 0, 0);
 139     return s;
 140 }
 141
 142 static int shall_we_drop(AVFormatContext *s, int index, enum dshowDeviceType devtype)
 143 {
 144     struct dshow_ctx *ctx = s->priv_data;
 145     static const uint8_t dropscore[] = {62, 75, 87, 100};
 146     const int ndropscores = FF_ARRAY_ELEMS(dropscore);
 147     unsigned int buffer_fullness = (ctx->curbufsize[index]*100)/s->max_picture_buffer;
 148     const char *devtypename = (devtype == VideoDevice) ? "video" : "audio";
 149
 150     if(dropscore[++ctx->video_frame_num%ndropscores] <= buffer_fullness) {
 151         av_log(s, AV_LOG_ERROR,
 152               "real-time buffer [%s] [%s input] too full or near too full (%d%% of size: %d [rtbufsize parameter])! frame dropped!\n",
 153               ctx->device_name[devtype], devtypename, buffer_fullness, s->max_picture_buffer);
 154         return 1;
 155     }
 156
 157     return 0;
 158 }
 159
 160 static void
 161 callback(void *priv_data, int index, uint8_t *buf, int buf_size, int64_t time, enum dshowDeviceType devtype)
 162 {
 163     AVFormatContext *s = priv_data;
 164     struct dshow_ctx *ctx = s->priv_data;
 165     AVPacketList **ppktl, *pktl_next;
 166
 167 //    dump_videohdr(s, vdhdr);
 168
 169     WaitForSingleObject(ctx->mutex, INFINITE);
 170
 171     if(shall_we_drop(s, index, devtype))
 172         goto fail;
 173
 174     pktl_next = av_mallocz(sizeof(AVPacketList));
 175     if(!pktl_next)
 176         goto fail;
 177
 178     if(av_new_packet(&pktl_next->pkt, buf_size) < 0) {
 179         av_free(pktl_next);
 180         goto fail;
 181     }
 182
 183     pktl_next->pkt.stream_index = index;
 184     pktl_next->pkt.pts = time;
 185     memcpy(pktl_next->pkt.data, buf, buf_size);
 186
 187     for(ppktl = &ctx->pktl ; *ppktl ; ppktl = &(*ppktl)->next);
 188     *ppktl = pktl_next;
 189     ctx->curbufsize[index] += buf_size;
 190
 191     SetEvent(ctx->event[1]);
 192     ReleaseMutex(ctx->mutex);
 193
 194     return;
 195 fail:
 196     ReleaseMutex(ctx->mutex);
 197     return;
 198 }
 199
 200 /**
 201  * Cycle through available devices using the device enumerator devenum,
 202  * retrieve the device with type specified by devtype and return the
 203  * pointer to the object found in *pfilter.
 204  * If pfilter is NULL, list all device names.
 205  */
 206 static int
 207 dshow_cycle_devices(AVFormatContext *avctx, ICreateDevEnum *devenum,
 208                     enum dshowDeviceType devtype, enum dshowSourceFilterType sourcetype,
 209                     IBaseFilter **pfilter, char **device_unique_name)
 210 {
 211     struct dshow_ctx *ctx = avctx->priv_data;
 212     IBaseFilter *device_filter = NULL;
 213     IEnumMoniker *classenum = NULL;
 214     IMoniker *m = NULL;
 215     const char *device_name = ctx->device_name[devtype];
 216     int skip = (devtype == VideoDevice) ? ctx->video_device_number
 217                                         : ctx->audio_device_number;
 218     int r;
 219
 220     const GUID *device_guid[2] = { &CLSID_VideoInputDeviceCategory,
 221                                    &CLSID_AudioInputDeviceCategory };
 222     const char *devtypename = (devtype == VideoDevice) ? "video" : "audio only";
 223     const char *sourcetypename = (sourcetype == VideoSourceDevice) ? "video" : "audio";
 224
 225     r = ICreateDevEnum_CreateClassEnumerator(devenum, device_guid[sourcetype],
 226                                              (IEnumMoniker **) &classenum, 0);
 227     if (r != S_OK) {
 228         av_log(avctx, AV_LOG_ERROR, "Could not enumerate %s devices (or none found).\n",
 229                devtypename);
 230         return AVERROR(EIO);
 231     }
 232
 233     while (!device_filter && IEnumMoniker_Next(classenum, 1, &m, NULL) == S_OK) {
 234         IPropertyBag *bag = NULL;
 235         char *friendly_name = NULL;
 236         char *unique_name = NULL;
 237         VARIANT var;
 238         IBindCtx *bind_ctx = NULL;
 239         LPOLESTR olestr = NULL;
 240         LPMALLOC co_malloc = NULL;
 241         int i;
 242
 243         r = CoGetMalloc(1, &co_malloc);
 244         if (r != S_OK)
 245             goto fail1;
 246         r = CreateBindCtx(0, &bind_ctx);
 247         if (r != S_OK)
 248             goto fail1;
 249         /* GetDisplayname works for both video and audio, DevicePath doesn't */
 250         r = IMoniker_GetDisplayName(m, bind_ctx, NULL, &olestr);
 251         if (r != S_OK)
 252             goto fail1;
 253         unique_name = dup_wchar_to_utf8(olestr);
 254         /* replace ':' with '_' since we use : to delineate between sources */
 255         for (i = 0; i < strlen(unique_name); i++) {
 256             if (unique_name[i] == ':')
 257                 unique_name[i] = '_';
 258         }
 259
 260         r = IMoniker_BindToStorage(m, 0, 0, &IID_IPropertyBag, (void *) &bag);
 261         if (r != S_OK)
 262             goto fail1;
 263
 264         var.vt = VT_BSTR;
 265         r = IPropertyBag_Read(bag, L"FriendlyName", &var, NULL);
 266         if (r != S_OK)
 267             goto fail1;
 268         friendly_name = dup_wchar_to_utf8(var.bstrVal);
 269
 270         if (pfilter) {
 271             if (strcmp(device_name, friendly_name) && strcmp(device_name, unique_name))
 272                 goto fail1;
 273
 274             if (!skip--) {
 275                 r = IMoniker_BindToObject(m, 0, 0, &IID_IBaseFilter, (void *) &device_filter);
 276                 if (r != S_OK) {
 277                     av_log(avctx, AV_LOG_ERROR, "Unable to BindToObject for %s\n", device_name);
 278                     goto fail1;
 279                 }
 280                 *device_unique_name = unique_name;
 281                 unique_name = NULL;
 282                 // success, loop will end now
 283             }
 284         } else {
 285             av_log(avctx, AV_LOG_INFO, " \"%s\"\n", friendly_name);
 286             av_log(avctx, AV_LOG_INFO, "    Alternative name \"%s\"\n", unique_name);
 287         }
 288
 289 fail1:
 290         if (olestr && co_malloc)
 291             IMalloc_Free(co_malloc, olestr);
 292         if (bind_ctx)
 293             IBindCtx_Release(bind_ctx);
 294         av_freep(&friendly_name);
 295         av_freep(&unique_name);
 296         if (bag)
 297             IPropertyBag_Release(bag);
 298         IMoniker_Release(m);
 299     }
 300
 301     IEnumMoniker_Release(classenum);
 302
 303     if (pfilter) {
 304         if (!device_filter) {
 305             av_log(avctx, AV_LOG_ERROR, "Could not find %s device with name [%s] among source devices of type %s.\n",
 306                    devtypename, device_name, sourcetypename);
 307             return AVERROR(EIO);
 308         }
 309         *pfilter = device_filter;
 310     }
 311
 312     return 0;
 313 }
 314
 315 /**
 316  * Cycle through available formats using the specified pin,
 317  * try to set parameters specified through AVOptions and if successful
 318  * return 1 in *pformat_set.
 319  * If pformat_set is NULL, list all pin capabilities.
 320  */
 321 static void
 322 dshow_cycle_formats(AVFormatContext *avctx, enum dshowDeviceType devtype,
 323                     IPin *pin, int *pformat_set)
 324 {
 325     struct dshow_ctx *ctx = avctx->priv_data;
 326     IAMStreamConfig *config = NULL;
 327     AM_MEDIA_TYPE *type = NULL;
 328     int format_set = 0;
 329     void *caps = NULL;
 330     int i, n, size, r;
 331
 332     if (IPin_QueryInterface(pin, &IID_IAMStreamConfig, (void **) &config) != S_OK)
 333         return;
 334     if (IAMStreamConfig_GetNumberOfCapabilities(config, &n, &size) != S_OK)
 335         goto end;
 336
 337     caps = av_malloc(size);
 338     if (!caps)
 339         goto end;
 340
 341     for (i = 0; i < n && !format_set; i++) {
 342         r = IAMStreamConfig_GetStreamCaps(config, i, &type, (void *) caps);
 343         if (r != S_OK)
 344             goto next;
 345 #if DSHOWDEBUG
 346         ff_print_AM_MEDIA_TYPE(type);
 347 #endif
 348
 349         if (devtype == VideoDevice) {
 350             VIDEO_STREAM_CONFIG_CAPS *vcaps = caps;
 351             BITMAPINFOHEADER *bih;
 352             int64_t *fr;
 353             const AVCodecTag *const tags[] = { avformat_get_riff_video_tags(), NULL };
 354 #if DSHOWDEBUG
 355             ff_print_VIDEO_STREAM_CONFIG_CAPS(vcaps);
 356 #endif
 357             if (IsEqualGUID(&type->formattype, &FORMAT_VideoInfo)) {
 358                 VIDEOINFOHEADER *v = (void *) type->pbFormat;
 359                 fr = &v->AvgTimePerFrame;
 360                 bih = &v->bmiHeader;
 361             } else if (IsEqualGUID(&type->formattype, &FORMAT_VideoInfo2)) {
 362                 VIDEOINFOHEADER2 *v = (void *) type->pbFormat;
 363                 fr = &v->AvgTimePerFrame;
 364                 bih = &v->bmiHeader;
 365             } else {
 366                 goto next;
 367             }
 368             if (!pformat_set) {
 369                 enum AVPixelFormat pix_fmt = dshow_pixfmt(bih->biCompression, bih->biBitCount);
 370                 if (pix_fmt == AV_PIX_FMT_NONE) {
 371                     enum AVCodecID codec_id = av_codec_get_id(tags, bih->biCompression);
 372                     AVCodec *codec = avcodec_find_decoder(codec_id);
 373                     if (codec_id == AV_CODEC_ID_NONE || !codec) {
 374                         av_log(avctx, AV_LOG_INFO, "  unknown compression type 0x%X", (int) bih->biCompression);
 375                     } else {
 376                         av_log(avctx, AV_LOG_INFO, "  vcodec=%s", codec->name);
 377                     }
 378                 } else {
 379                     av_log(avctx, AV_LOG_INFO, "  pixel_format=%s", av_get_pix_fmt_name(pix_fmt));
 380                 }
 381                 av_log(avctx, AV_LOG_INFO, "  min s=%ldx%ld fps=%g max s=%ldx%ld fps=%g\n",
 382                        vcaps->MinOutputSize.cx, vcaps->MinOutputSize.cy,
 383                        1e7 / vcaps->MaxFrameInterval,
 384                        vcaps->MaxOutputSize.cx, vcaps->MaxOutputSize.cy,
 385                        1e7 / vcaps->MinFrameInterval);
 386                 continue;
 387             }
 388             if (ctx->video_codec_id != AV_CODEC_ID_RAWVIDEO) {
 389                 if (ctx->video_codec_id != av_codec_get_id(tags, bih->biCompression))
 390                     goto next;
 391             }
 392             if (ctx->pixel_format != AV_PIX_FMT_NONE &&
 393                 ctx->pixel_format != dshow_pixfmt(bih->biCompression, bih->biBitCount)) {
 394                 goto next;
 395             }
 396             if (ctx->framerate) {
 397                 int64_t framerate = ((int64_t) ctx->requested_framerate.den*10000000)
 398                                             /  ctx->requested_framerate.num;
 399                 if (framerate > vcaps->MaxFrameInterval ||
 400                     framerate < vcaps->MinFrameInterval)
 401                     goto next;
 402                 *fr = framerate;
 403             }
 404             if (ctx->requested_width && ctx->requested_height) {
 405                 if (ctx->requested_width  > vcaps->MaxOutputSize.cx ||
 406                     ctx->requested_width  < vcaps->MinOutputSize.cx ||
 407                     ctx->requested_height > vcaps->MaxOutputSize.cy ||
 408                     ctx->requested_height < vcaps->MinOutputSize.cy)
 409                     goto next;
 410                 bih->biWidth  = ctx->requested_width;
 411                 bih->biHeight = ctx->requested_height;
 412             }
 413         } else {
 414             AUDIO_STREAM_CONFIG_CAPS *acaps = caps;
 415             WAVEFORMATEX *fx;
 416 #if DSHOWDEBUG
 417             ff_print_AUDIO_STREAM_CONFIG_CAPS(acaps);
 418 #endif
 419             if (IsEqualGUID(&type->formattype, &FORMAT_WaveFormatEx)) {
 420                 fx = (void *) type->pbFormat;
 421             } else {
 422                 goto next;
 423             }
 424             if (!pformat_set) {
 425                 av_log(avctx, AV_LOG_INFO, "  min ch=%lu bits=%lu rate=%6lu max ch=%lu bits=%lu rate=%6lu\n",
 426                        acaps->MinimumChannels, acaps->MinimumBitsPerSample, acaps->MinimumSampleFrequency,
 427                        acaps->MaximumChannels, acaps->MaximumBitsPerSample, acaps->MaximumSampleFrequency);
 428                 continue;
 429             }
 430             if (ctx->sample_rate) {
 431                 if (ctx->sample_rate > acaps->MaximumSampleFrequency ||
 432                     ctx->sample_rate < acaps->MinimumSampleFrequency)
 433                     goto next;
 434                 fx->nSamplesPerSec = ctx->sample_rate;
 435             }
 436             if (ctx->sample_size) {
 437                 if (ctx->sample_size > acaps->MaximumBitsPerSample ||
 438                     ctx->sample_size < acaps->MinimumBitsPerSample)
 439                     goto next;
 440                 fx->wBitsPerSample = ctx->sample_size;
 441             }
 442             if (ctx->channels) {
 443                 if (ctx->channels > acaps->MaximumChannels ||
 444                     ctx->channels < acaps->MinimumChannels)
 445                     goto next;
 446                 fx->nChannels = ctx->channels;
 447             }
 448         }
 449         if (IAMStreamConfig_SetFormat(config, type) != S_OK)
 450             goto next;
 451         format_set = 1;
 452 next:
 453         if (type->pbFormat)
 454             CoTaskMemFree(type->pbFormat);
 455         CoTaskMemFree(type);
 456     }
 457 end:
 458     IAMStreamConfig_Release(config);
 459     av_free(caps);
 460     if (pformat_set)
 461         *pformat_set = format_set;
 462 }
 463
 464 /**
 465  * Set audio device buffer size in milliseconds (which can directly impact
 466  * latency, depending on the device).
 467  */
 468 static int
 469 dshow_set_audio_buffer_size(AVFormatContext *avctx, IPin *pin)
 470 {
 471     struct dshow_ctx *ctx = avctx->priv_data;
 472     IAMBufferNegotiation *buffer_negotiation = NULL;
 473     ALLOCATOR_PROPERTIES props = { -1, -1, -1, -1 };
 474     IAMStreamConfig *config = NULL;
 475     AM_MEDIA_TYPE *type = NULL;
 476     int ret = AVERROR(EIO);
 477
 478     if (IPin_QueryInterface(pin, &IID_IAMStreamConfig, (void **) &config) != S_OK)
 479         goto end;
 480     if (IAMStreamConfig_GetFormat(config, &type) != S_OK)
 481         goto end;
 482     if (!IsEqualGUID(&type->formattype, &FORMAT_WaveFormatEx))
 483         goto end;
 484
 485     props.cbBuffer = (((WAVEFORMATEX *) type->pbFormat)->nAvgBytesPerSec)
 486                    * ctx->audio_buffer_size / 1000;
 487
 488     if (IPin_QueryInterface(pin, &IID_IAMBufferNegotiation, (void **) &buffer_negotiation) != S_OK)
 489         goto end;
 490     if (IAMBufferNegotiation_SuggestAllocatorProperties(buffer_negotiation, &props) != S_OK)
 491         goto end;
 492
 493     ret = 0;
 494
 495 end:
 496     if (buffer_negotiation)
 497         IAMBufferNegotiation_Release(buffer_negotiation);
 498     if (type) {
 499         if (type->pbFormat)
 500             CoTaskMemFree(type->pbFormat);
 501         CoTaskMemFree(type);
 502     }
 503     if (config)
 504         IAMStreamConfig_Release(config);
 505
 506     return ret;
 507 }
 508
 509 /**
 510  * Pops up a user dialog allowing them to adjust properties for the given filter, if possible.
 511  */
 512 void
 513 dshow_show_filter_properties(IBaseFilter *device_filter, AVFormatContext *avctx) {
 514     ISpecifyPropertyPages *property_pages = NULL;
 515     IUnknown *device_filter_iunknown = NULL;
 516     HRESULT hr;
 517     FILTER_INFO filter_info = {0}; /* a warning on this line is false positive GCC bug 53119 AFAICT */
 518     CAUUID ca_guid = {0};
 519
 520     hr  = IBaseFilter_QueryInterface(device_filter, &IID_ISpecifyPropertyPages, (void **)&property_pages);
 521     if (hr != S_OK) {
 522         av_log(avctx, AV_LOG_WARNING, "requested filter does not have a property page to show");
 523         goto end;
 524     }
 525     hr = IBaseFilter_QueryFilterInfo(device_filter, &filter_info);
 526     if (hr != S_OK) {
 527         goto fail;
 528     }
 529     hr = IBaseFilter_QueryInterface(device_filter, &IID_IUnknown, (void **)&device_filter_iunknown);
 530     if (hr != S_OK) {
 531         goto fail;
 532     }
 533     hr = ISpecifyPropertyPages_GetPages(property_pages, &ca_guid);
 534     if (hr != S_OK) {
 535         goto fail;
 536     }
 537     hr = OleCreatePropertyFrame(NULL, 0, 0, filter_info.achName, 1, &device_filter_iunknown, ca_guid.cElems,
 538         ca_guid.pElems, 0, 0, NULL);
 539     if (hr != S_OK) {
 540         goto fail;
 541     }
 542     goto end;
 543 fail:
 544     av_log(avctx, AV_LOG_ERROR, "Failure showing property pages for filter");
 545 end:
 546     if (property_pages)
 547         ISpecifyPropertyPages_Release(property_pages);
 548     if (device_filter_iunknown)
 549         IUnknown_Release(device_filter_iunknown);
 550     if (filter_info.pGraph)
 551         IFilterGraph_Release(filter_info.pGraph);
 552     if (ca_guid.pElems)
 553         CoTaskMemFree(ca_guid.pElems);
 554 }
 555
 556 /**
 557  * Cycle through available pins using the device_filter device, of type
 558  * devtype, retrieve the first output pin and return the pointer to the
 559  * object found in *ppin.
 560  * If ppin is NULL, cycle through all pins listing audio/video capabilities.
 561  */
 562 static int
 563 dshow_cycle_pins(AVFormatContext *avctx, enum dshowDeviceType devtype,
 564                  enum dshowSourceFilterType sourcetype, IBaseFilter *device_filter, IPin **ppin)
 565 {
 566     struct dshow_ctx *ctx = avctx->priv_data;
 567     IEnumPins *pins = 0;
 568     IPin *device_pin = NULL;
 569     IPin *pin;
 570     int r;
 571
 572     const GUID *mediatype[2] = { &MEDIATYPE_Video, &MEDIATYPE_Audio };
 573     const char *devtypename = (devtype == VideoDevice) ? "video" : "audio only";
 574     const char *sourcetypename = (sourcetype == VideoSourceDevice) ? "video" : "audio";
 575
 576     int set_format = (devtype == VideoDevice && (ctx->framerate ||
 577                                                 (ctx->requested_width && ctx->requested_height) ||
 578                                                  ctx->pixel_format != AV_PIX_FMT_NONE ||
 579                                                  ctx->video_codec_id != AV_CODEC_ID_RAWVIDEO))
 580                   || (devtype == AudioDevice && (ctx->channels || ctx->sample_rate));
 581     int format_set = 0;
 582     int should_show_properties = (devtype == VideoDevice) ? ctx->show_video_device_dialog : ctx->show_audio_device_dialog;
 583
 584     if (should_show_properties)
 585         dshow_show_filter_properties(device_filter, avctx);
 586
 587     r = IBaseFilter_EnumPins(device_filter, &pins);
 588     if (r != S_OK) {
 589         av_log(avctx, AV_LOG_ERROR, "Could not enumerate pins.\n");
 590         return AVERROR(EIO);
 591     }
 592
 593     if (!ppin) {
 594         av_log(avctx, AV_LOG_INFO, "DirectShow %s device options (from %s devices)\n",
 595                devtypename, sourcetypename);
 596     }
 597
 598     while (!device_pin && IEnumPins_Next(pins, 1, &pin, NULL) == S_OK) {
 599         IKsPropertySet *p = NULL;
 600         IEnumMediaTypes *types = NULL;
 601         PIN_INFO info = {0};
 602         AM_MEDIA_TYPE *type;
 603         GUID category;
 604         DWORD r2;
 605         char *name_buf = NULL;
 606         wchar_t *pin_id = NULL;
 607         char *pin_buf = NULL;
 608         char *desired_pin_name = devtype == VideoDevice ? ctx->video_pin_name : ctx->audio_pin_name;
 609
 610         IPin_QueryPinInfo(pin, &info);
 611         IBaseFilter_Release(info.pFilter);
 612
 613         if (info.dir != PINDIR_OUTPUT)
 614             goto next;
 615         if (IPin_QueryInterface(pin, &IID_IKsPropertySet, (void **) &p) != S_OK)
 616             goto next;
 617         if (IKsPropertySet_Get(p, &AMPROPSETID_Pin, AMPROPERTY_PIN_CATEGORY,
 618                                NULL, 0, &category, sizeof(GUID), &r2) != S_OK)
 619             goto next;
 620         if (!IsEqualGUID(&category, &PIN_CATEGORY_CAPTURE))
 621             goto next;
 622         name_buf = dup_wchar_to_utf8(info.achName);
 623
 624         r = IPin_QueryId(pin, &pin_id);
 625         if (r != S_OK) {
 626             av_log(avctx, AV_LOG_ERROR, "Could not query pin id\n");
 627             return AVERROR(EIO);
 628         }
 629         pin_buf = dup_wchar_to_utf8(pin_id);
 630
 631         if (!ppin) {
 632             av_log(avctx, AV_LOG_INFO, " Pin \"%s\" (alternative pin name \"%s\")\n", name_buf, pin_buf);
 633             dshow_cycle_formats(avctx, devtype, pin, NULL);
 634             goto next;
 635         }
 636
 637         if (desired_pin_name) {
 638             if(strcmp(name_buf, desired_pin_name) && strcmp(pin_buf, desired_pin_name)) {
 639                 av_log(avctx, AV_LOG_DEBUG, "skipping pin \"%s\" (\"%s\") != requested \"%s\"\n",
 640                     name_buf, pin_buf, desired_pin_name);
 641                 goto next;
 642             }
 643         }
 644
 645         if (set_format) {
 646             dshow_cycle_formats(avctx, devtype, pin, &format_set);
 647             if (!format_set) {
 648                 goto next;
 649             }
 650         }
 651         if (devtype == AudioDevice && ctx->audio_buffer_size) {
 652             if (dshow_set_audio_buffer_size(avctx, pin) < 0) {
 653                 av_log(avctx, AV_LOG_ERROR, "unable to set audio buffer size %d to pin, using pin anyway...", ctx->audio_buffer_size);
 654             }
 655         }
 656
 657         if (IPin_EnumMediaTypes(pin, &types) != S_OK)
 658             goto next;
 659
 660         IEnumMediaTypes_Reset(types);
 661         /* in case format_set was not called, just verify the majortype */
 662         while (!device_pin && IEnumMediaTypes_Next(types, 1, &type, NULL) == S_OK) {
 663             if (IsEqualGUID(&type->majortype, mediatype[devtype])) {
 664                 device_pin = pin;
 665                 av_log(avctx, AV_LOG_DEBUG, "Selecting pin %s on %s\n", name_buf, devtypename);
 666                 goto next;
 667             }
 668             CoTaskMemFree(type);
 669         }
 670
 671 next:
 672         if (types)
 673             IEnumMediaTypes_Release(types);
 674         if (p)
 675             IKsPropertySet_Release(p);
 676         if (device_pin != pin)
 677             IPin_Release(pin);
 678         av_free(name_buf);
 679         av_free(pin_buf);
 680         if (pin_id)
 681             CoTaskMemFree(pin_id);
 682     }
 683
 684     IEnumPins_Release(pins);
 685
 686     if (ppin) {
 687         if (set_format && !format_set) {
 688             av_log(avctx, AV_LOG_ERROR, "Could not set %s options\n", devtypename);
 689             return AVERROR(EIO);
 690         }
 691         if (!device_pin) {
 692             av_log(avctx, AV_LOG_ERROR,
 693                 "Could not find output pin from %s capture device.\n", devtypename);
 694             return AVERROR(EIO);
 695         }
 696         *ppin = device_pin;
 697     }
 698
 699     return 0;
 700 }
 701
 702 /**
 703  * List options for device with type devtype, source filter type sourcetype
 704  *
 705  * @param devenum device enumerator used for accessing the device
 706  */
 707 static int
 708 dshow_list_device_options(AVFormatContext *avctx, ICreateDevEnum *devenum,
 709                           enum dshowDeviceType devtype, enum dshowSourceFilterType sourcetype)
 710 {
 711     struct dshow_ctx *ctx = avctx->priv_data;
 712     IBaseFilter *device_filter = NULL;
 713     char *device_unique_name = NULL;
 714     int r;
 715
 716     if ((r = dshow_cycle_devices(avctx, devenum, devtype, sourcetype, &device_filter, &device_unique_name)) < 0)
 717         return r;
 718     ctx->device_filter[devtype] = device_filter;
 719     if ((r = dshow_cycle_pins(avctx, devtype, sourcetype, device_filter, NULL)) < 0)
 720         return r;
 721     av_freep(&device_unique_name);
 722     return 0;
 723 }
 724
 725 static int
 726 dshow_open_device(AVFormatContext *avctx, ICreateDevEnum *devenum,
 727                   enum dshowDeviceType devtype, enum dshowSourceFilterType sourcetype)
 728 {
 729     struct dshow_ctx *ctx = avctx->priv_data;
 730     IBaseFilter *device_filter = NULL;
 731     char *device_filter_unique_name = NULL;
 732     IGraphBuilder *graph = ctx->graph;
 733     IPin *device_pin = NULL;
 734     libAVPin *capture_pin = NULL;
 735     libAVFilter *capture_filter = NULL;
 736     ICaptureGraphBuilder2 *graph_builder2 = NULL;
 737     int ret = AVERROR(EIO);
 738     int r;
 739     IStream *ifile_stream = NULL;
 740     IStream *ofile_stream = NULL;
 741     IPersistStream *pers_stream = NULL;
 742     enum dshowDeviceType otherDevType = (devtype == VideoDevice) ? AudioDevice : VideoDevice;
 743
 744     const wchar_t *filter_name[2] = { L"Audio capture filter", L"Video capture filter" };
 745
 746
 747     if ( ((ctx->audio_filter_load_file) && (strlen(ctx->audio_filter_load_file)>0) && (sourcetype == AudioSourceDevice)) ||
 748             ((ctx->video_filter_load_file) && (strlen(ctx->video_filter_load_file)>0) && (sourcetype == VideoSourceDevice)) ) {
 749         HRESULT hr;
 750         char *filename = NULL;
 751
 752         if (sourcetype == AudioSourceDevice)
 753             filename = ctx->audio_filter_load_file;
 754         else
 755             filename = ctx->video_filter_load_file;
 756
 757         hr = SHCreateStreamOnFile ((LPCSTR) filename, STGM_READ, &ifile_stream);
 758         if (S_OK != hr) {
 759             av_log(avctx, AV_LOG_ERROR, "Could not open capture filter description file.\n");
 760             goto error;
 761         }
 762
 763         hr = OleLoadFromStream(ifile_stream, &IID_IBaseFilter, (void **) &device_filter);
 764         if (hr != S_OK) {
 765             av_log(avctx, AV_LOG_ERROR, "Could not load capture filter from file.\n");
 766             goto error;
 767         }
 768
 769         if (sourcetype == AudioSourceDevice)
 770             av_log(avctx, AV_LOG_INFO, "Audio-");
 771         else
 772             av_log(avctx, AV_LOG_INFO, "Video-");
 773         av_log(avctx, AV_LOG_INFO, "Capture filter loaded successfully from file \"%s\".\n", filename);
 774     } else {
 775
 776         if ((r = dshow_cycle_devices(avctx, devenum, devtype, sourcetype, &device_filter, &device_filter_unique_name)) < 0) {
 777             ret = r;
 778             goto error;
 779         }
 780     }
 781     if (ctx->device_filter[otherDevType]) {
 782         // avoid adding add two instances of the same device to the graph, one for video, one for audio
 783         // a few devices don't support this (could also do this check earlier to avoid double crossbars, etc. but they seem OK)
 784         if (!device_filter_unique_name || strcmp(device_filter_unique_name, ctx->device_unique_name[otherDevType]) == 0) {
 785           av_log(avctx, AV_LOG_DEBUG, "reusing previous graph capture filter... %s\n", device_filter_unique_name);
 786           IBaseFilter_Release(device_filter);
 787           device_filter = ctx->device_filter[otherDevType];
 788           IBaseFilter_AddRef(ctx->device_filter[otherDevType]);
 789         } else {
 790             av_log(avctx, AV_LOG_DEBUG, "not reusing previous graph capture filter %s != %s\n", device_filter_unique_name, ctx->device_unique_name[otherDevType]);
 791         }
 792     }
 793
 794     ctx->device_filter [devtype] = device_filter;
 795     ctx->device_unique_name [devtype] = device_filter_unique_name;
 796
 797     r = IGraphBuilder_AddFilter(graph, device_filter, NULL);
 798     if (r != S_OK) {
 799         av_log(avctx, AV_LOG_ERROR, "Could not add device filter to graph.\n");
 800         goto error;
 801     }
 802
 803     if ((r = dshow_cycle_pins(avctx, devtype, sourcetype, device_filter, &device_pin)) < 0) {
 804         ret = r;
 805         goto error;
 806     }
 807
 808     ctx->device_pin[devtype] = device_pin;
 809
 810     capture_filter = libAVFilter_Create(avctx, callback, devtype);
 811     if (!capture_filter) {
 812         av_log(avctx, AV_LOG_ERROR, "Could not create grabber filter.\n");
 813         goto error;
 814     }
 815     ctx->capture_filter[devtype] = capture_filter;
 816
 817     if ( ((ctx->audio_filter_save_file) && (strlen(ctx->audio_filter_save_file)>0) && (sourcetype == AudioSourceDevice)) ||
 818             ((ctx->video_filter_save_file) && (strlen(ctx->video_filter_save_file)>0) && (sourcetype == VideoSourceDevice)) ) {
 819
 820         HRESULT hr;
 821         char *filename = NULL;
 822
 823         if (sourcetype == AudioSourceDevice)
 824             filename = ctx->audio_filter_save_file;
 825         else
 826             filename = ctx->video_filter_save_file;
 827
 828         hr = SHCreateStreamOnFile ((LPCSTR) filename, STGM_CREATE | STGM_READWRITE, &ofile_stream);
 829         if (S_OK != hr) {
 830             av_log(avctx, AV_LOG_ERROR, "Could not create capture filter description file.\n");
 831             goto error;
 832         }
 833
 834         hr  = IBaseFilter_QueryInterface(device_filter, &IID_IPersistStream, (void **) &pers_stream);
 835         if (hr != S_OK) {
 836             av_log(avctx, AV_LOG_ERROR, "Query for IPersistStream failed.\n");
 837             goto error;
 838         }
 839
 840         hr = OleSaveToStream(pers_stream, ofile_stream);
 841         if (hr != S_OK) {
 842             av_log(avctx, AV_LOG_ERROR, "Could not save capture filter \n");
 843             goto error;
 844         }
 845
 846         hr = IStream_Commit(ofile_stream, STGC_DEFAULT);
 847         if (S_OK != hr) {
 848             av_log(avctx, AV_LOG_ERROR, "Could not commit capture filter data to file.\n");
 849             goto error;
 850         }
 851
 852         if (sourcetype == AudioSourceDevice)
 853             av_log(avctx, AV_LOG_INFO, "Audio-");
 854         else
 855             av_log(avctx, AV_LOG_INFO, "Video-");
 856         av_log(avctx, AV_LOG_INFO, "Capture filter saved successfully to file \"%s\".\n", filename);
 857     }
 858
 859     r = IGraphBuilder_AddFilter(graph, (IBaseFilter *) capture_filter,
 860                                 filter_name[devtype]);
 861     if (r != S_OK) {
 862         av_log(avctx, AV_LOG_ERROR, "Could not add capture filter to graph\n");
 863         goto error;
 864     }
 865
 866     libAVPin_AddRef(capture_filter->pin);
 867     capture_pin = capture_filter->pin;
 868     ctx->capture_pin[devtype] = capture_pin;
 869
 870     r = CoCreateInstance(&CLSID_CaptureGraphBuilder2, NULL, CLSCTX_INPROC_SERVER,
 871                          &IID_ICaptureGraphBuilder2, (void **) &graph_builder2);
 872     if (r != S_OK) {
 873         av_log(avctx, AV_LOG_ERROR, "Could not create CaptureGraphBuilder2\n");
 874         goto error;
 875     }
 876     r = ICaptureGraphBuilder2_SetFiltergraph(graph_builder2, graph);
 877     if (r != S_OK) {
 878         av_log(avctx, AV_LOG_ERROR, "Could not set graph for CaptureGraphBuilder2\n");
 879         goto error;
 880     }
 881
 882     r = ICaptureGraphBuilder2_RenderStream(graph_builder2, NULL, NULL, (IUnknown *) device_pin, NULL /* no intermediate filter */,
 883         (IBaseFilter *) capture_filter); /* connect pins, optionally insert intermediate filters like crossbar if necessary */
 884
 885     if (r != S_OK) {
 886         av_log(avctx, AV_LOG_ERROR, "Could not RenderStream to connect pins\n");
 887         goto error;
 888     }
 889
 890     r = dshow_try_setup_crossbar_options(graph_builder2, device_filter, devtype, avctx);
 891
 892     if (r != S_OK) {
 893         av_log(avctx, AV_LOG_ERROR, "Could not setup CrossBar\n");
 894         goto error;
 895     }
 896
 897     ret = 0;
 898
 899 error:
 900     if (graph_builder2 != NULL)
 901         ICaptureGraphBuilder2_Release(graph_builder2);
 902
 903     if (pers_stream)
 904         IPersistStream_Release(pers_stream);
 905
 906     if (ifile_stream)
 907         IStream_Release(ifile_stream);
 908
 909     if (ofile_stream)
 910         IStream_Release(ofile_stream);
 911
 912     return ret;
 913 }
 914
 915 static enum AVCodecID waveform_codec_id(enum AVSampleFormat sample_fmt)
 916 {
 917     switch (sample_fmt) {
 918     case AV_SAMPLE_FMT_U8:  return AV_CODEC_ID_PCM_U8;
 919     case AV_SAMPLE_FMT_S16: return AV_CODEC_ID_PCM_S16LE;
 920     case AV_SAMPLE_FMT_S32: return AV_CODEC_ID_PCM_S32LE;
 921     default:                return AV_CODEC_ID_NONE; /* Should never happen. */
 922     }
 923 }
 924
 925 static enum AVSampleFormat sample_fmt_bits_per_sample(int bits)
 926 {
 927     switch (bits) {
 928     case 8:  return AV_SAMPLE_FMT_U8;
 929     case 16: return AV_SAMPLE_FMT_S16;
 930     case 32: return AV_SAMPLE_FMT_S32;
 931     default: return AV_SAMPLE_FMT_NONE; /* Should never happen. */
 932     }
 933 }
 934
 935 static int
 936 dshow_add_device(AVFormatContext *avctx,
 937                  enum dshowDeviceType devtype)
 938 {
 939     struct dshow_ctx *ctx = avctx->priv_data;
 940     AM_MEDIA_TYPE type;
 941     AVCodecParameters *par;
 942     AVStream *st;
 943     int ret = AVERROR(EIO);
 944
 945     type.pbFormat = NULL;
 946
 947     st = avformat_new_stream(avctx, NULL);
 948     if (!st) {
 949         ret = AVERROR(ENOMEM);
 950         goto error;
 951     }
 952     st->id = devtype;
 953
 954     ctx->capture_filter[devtype]->stream_index = st->index;
 955
 956     libAVPin_ConnectionMediaType(ctx->capture_pin[devtype], &type);
 957
 958     par = st->codecpar;
 959     if (devtype == VideoDevice) {
 960         BITMAPINFOHEADER *bih = NULL;
 961         AVRational time_base;
 962
 963         if (IsEqualGUID(&type.formattype, &FORMAT_VideoInfo)) {
 964             VIDEOINFOHEADER *v = (void *) type.pbFormat;
 965             time_base = (AVRational) { v->AvgTimePerFrame, 10000000 };
 966             bih = &v->bmiHeader;
 967         } else if (IsEqualGUID(&type.formattype, &FORMAT_VideoInfo2)) {
 968             VIDEOINFOHEADER2 *v = (void *) type.pbFormat;
 969             time_base = (AVRational) { v->AvgTimePerFrame, 10000000 };
 970             bih = &v->bmiHeader;
 971         }
 972         if (!bih) {
 973             av_log(avctx, AV_LOG_ERROR, "Could not get media type.\n");
 974             goto error;
 975         }
 976
 977         st->avg_frame_rate = av_inv_q(time_base);
 978         st->r_frame_rate = av_inv_q(time_base);
 979
 980         par->codec_type = AVMEDIA_TYPE_VIDEO;
 981         par->width      = bih->biWidth;
 982         par->height     = bih->biHeight;
 983         par->codec_tag  = bih->biCompression;
 984         par->format     = dshow_pixfmt(bih->biCompression, bih->biBitCount);
 985         if (bih->biCompression == MKTAG('H', 'D', 'Y', 'C')) {
 986             av_log(avctx, AV_LOG_DEBUG, "attempt to use full range for HDYC...\n");
 987             par->color_range = AVCOL_RANGE_MPEG; // just in case it needs this...
 988         }
 989         if (par->format == AV_PIX_FMT_NONE) {
 990             const AVCodecTag *const tags[] = { avformat_get_riff_video_tags(), NULL };
 991             par->codec_id = av_codec_get_id(tags, bih->biCompression);
 992             if (par->codec_id == AV_CODEC_ID_NONE) {
 993                 av_log(avctx, AV_LOG_ERROR, "Unknown compression type. "
 994                                  "Please report type 0x%X.\n", (int) bih->biCompression);
 995                 ret = AVERROR_PATCHWELCOME;
 996                 goto error;
 997             }
 998             par->bits_per_coded_sample = bih->biBitCount;
 999         } else {
1000             par->codec_id = AV_CODEC_ID_RAWVIDEO;
1001             if (bih->biCompression == BI_RGB || bih->biCompression == BI_BITFIELDS) {
1002                 par->bits_per_coded_sample = bih->biBitCount;
1003                 if (par->height < 0) {
1004                     par->height *= -1;
1005                 } else {
1006                     par->extradata = av_malloc(9 + AV_INPUT_BUFFER_PADDING_SIZE);
1007                     if (par->extradata) {
1008                         par->extradata_size = 9;
1009                         memcpy(par->extradata, "BottomUp", 9);
1010                     }
1011                 }
1012             }
1013         }
1014     } else {
1015         WAVEFORMATEX *fx = NULL;
1016
1017         if (IsEqualGUID(&type.formattype, &FORMAT_WaveFormatEx)) {
1018             fx = (void *) type.pbFormat;
1019         }
1020         if (!fx) {
1021             av_log(avctx, AV_LOG_ERROR, "Could not get media type.\n");
1022             goto error;
1023         }
1024
1025         par->codec_type  = AVMEDIA_TYPE_AUDIO;
1026         par->format      = sample_fmt_bits_per_sample(fx->wBitsPerSample);
1027         par->codec_id    = waveform_codec_id(par->format);
1028         par->sample_rate = fx->nSamplesPerSec;
1029         par->channels    = fx->nChannels;
1030     }
1031
1032     avpriv_set_pts_info(st, 64, 1, 10000000);
1033
1034     ret = 0;
1035
1036 error:
1037     if (type.pbFormat)
1038         CoTaskMemFree(type.pbFormat);
1039     return ret;
1040 }
1041
1042 static int parse_device_name(AVFormatContext *avctx)
1043 {
1044     struct dshow_ctx *ctx = avctx->priv_data;
1045     char **device_name = ctx->device_name;
1046     char *name = av_strdup(avctx->url);
1047     char *tmp = name;
1048     int ret = 1;
1049     char *type;
1050
1051     while ((type = strtok(tmp, "="))) {
1052         char *token = strtok(NULL, ":");
1053         tmp = NULL;
1054
1055         if        (!strcmp(type, "video")) {
1056             device_name[0] = token;
1057         } else if (!strcmp(type, "audio")) {
1058             device_name[1] = token;
1059         } else {
1060             device_name[0] = NULL;
1061             device_name[1] = NULL;
1062             break;
1063         }
1064     }
1065
1066     if (!device_name[0] && !device_name[1]) {
1067         ret = 0;
1068     } else {
1069         if (device_name[0])
1070             device_name[0] = av_strdup(device_name[0]);
1071         if (device_name[1])
1072             device_name[1] = av_strdup(device_name[1]);
1073     }
1074
1075     av_free(name);
1076     return ret;
1077 }
1078
1079 static int dshow_read_header(AVFormatContext *avctx)
1080 {
1081     struct dshow_ctx *ctx = avctx->priv_data;
1082     IGraphBuilder *graph = NULL;
1083     ICreateDevEnum *devenum = NULL;
1084     IMediaControl *control = NULL;
1085     IMediaEvent *media_event = NULL;
1086     HANDLE media_event_handle;
1087     HANDLE proc;
1088     int ret = AVERROR(EIO);
1089     int r;
1090
1091     CoInitialize(0);
1092
1093     if (!ctx->list_devices && !parse_device_name(avctx)) {
1094         av_log(avctx, AV_LOG_ERROR, "Malformed dshow input string.\n");
1095         goto error;
1096     }
1097
1098     ctx->video_codec_id = avctx->video_codec_id ? avctx->video_codec_id
1099                                                 : AV_CODEC_ID_RAWVIDEO;
1100     if (ctx->pixel_format != AV_PIX_FMT_NONE) {
1101         if (ctx->video_codec_id != AV_CODEC_ID_RAWVIDEO) {
1102             av_log(avctx, AV_LOG_ERROR, "Pixel format may only be set when "
1103                               "video codec is not set or set to rawvideo\n");
1104             ret = AVERROR(EINVAL);
1105             goto error;
1106         }
1107     }
1108     if (ctx->framerate) {
1109         r = av_parse_video_rate(&ctx->requested_framerate, ctx->framerate);
1110         if (r < 0) {
1111             av_log(avctx, AV_LOG_ERROR, "Could not parse framerate '%s'.\n", ctx->framerate);
1112             goto error;
1113         }
1114     }
1115
1116     r = CoCreateInstance(&CLSID_FilterGraph, NULL, CLSCTX_INPROC_SERVER,
1117                          &IID_IGraphBuilder, (void **) &graph);
1118     if (r != S_OK) {
1119         av_log(avctx, AV_LOG_ERROR, "Could not create capture graph.\n");
1120         goto error;
1121     }
1122     ctx->graph = graph;
1123
1124     r = CoCreateInstance(&CLSID_SystemDeviceEnum, NULL, CLSCTX_INPROC_SERVER,
1125                          &IID_ICreateDevEnum, (void **) &devenum);
1126     if (r != S_OK) {
1127         av_log(avctx, AV_LOG_ERROR, "Could not enumerate system devices.\n");
1128         goto error;
1129     }
1130
1131     if (ctx->list_devices) {
1132         av_log(avctx, AV_LOG_INFO, "DirectShow video devices (some may be both video and audio devices)\n");
1133         dshow_cycle_devices(avctx, devenum, VideoDevice, VideoSourceDevice, NULL, NULL);
1134         av_log(avctx, AV_LOG_INFO, "DirectShow audio devices\n");
1135         dshow_cycle_devices(avctx, devenum, AudioDevice, AudioSourceDevice, NULL, NULL);
1136         ret = AVERROR_EXIT;
1137         goto error;
1138     }
1139     if (ctx->list_options) {
1140         if (ctx->device_name[VideoDevice])
1141             if ((r = dshow_list_device_options(avctx, devenum, VideoDevice, VideoSourceDevice))) {
1142                 ret = r;
1143                 goto error;
1144             }
1145         if (ctx->device_name[AudioDevice]) {
1146             if (dshow_list_device_options(avctx, devenum, AudioDevice, AudioSourceDevice)) {
1147                 /* show audio options from combined video+audio sources as fallback */
1148                 if ((r = dshow_list_device_options(avctx, devenum, AudioDevice, VideoSourceDevice))) {
1149                     ret = r;
1150                     goto error;
1151                 }
1152             }
1153         }
1154     }
1155     if (ctx->device_name[VideoDevice]) {
1156         if ((r = dshow_open_device(avctx, devenum, VideoDevice, VideoSourceDevice)) < 0 ||
1157             (r = dshow_add_device(avctx, VideoDevice)) < 0) {
1158             ret = r;
1159             goto error;
1160         }
1161     }
1162     if (ctx->device_name[AudioDevice]) {
1163         if ((r = dshow_open_device(avctx, devenum, AudioDevice, AudioSourceDevice)) < 0 ||
1164             (r = dshow_add_device(avctx, AudioDevice)) < 0) {
1165             av_log(avctx, AV_LOG_INFO, "Searching for audio device within video devices for %s\n", ctx->device_name[AudioDevice]);
1166             /* see if there's a video source with an audio pin with the given audio name */
1167             if ((r = dshow_open_device(avctx, devenum, AudioDevice, VideoSourceDevice)) < 0 ||
1168                 (r = dshow_add_device(avctx, AudioDevice)) < 0) {
1169                 ret = r;
1170                 goto error;
1171             }
1172         }
1173     }
1174     if (ctx->list_options) {
1175         /* allow it to list crossbar options in dshow_open_device */
1176         ret = AVERROR_EXIT;
1177         goto error;
1178     }
1179     ctx->curbufsize[0] = 0;
1180     ctx->curbufsize[1] = 0;
1181     ctx->mutex = CreateMutex(NULL, 0, NULL);
1182     if (!ctx->mutex) {
1183         av_log(avctx, AV_LOG_ERROR, "Could not create Mutex\n");
1184         goto error;
1185     }
1186     ctx->event[1] = CreateEvent(NULL, 1, 0, NULL);
1187     if (!ctx->event[1]) {
1188         av_log(avctx, AV_LOG_ERROR, "Could not create Event\n");
1189         goto error;
1190     }
1191
1192     r = IGraphBuilder_QueryInterface(graph, &IID_IMediaControl, (void **) &control);
1193     if (r != S_OK) {
1194         av_log(avctx, AV_LOG_ERROR, "Could not get media control.\n");
1195         goto error;
1196     }
1197     ctx->control = control;
1198
1199     r = IGraphBuilder_QueryInterface(graph, &IID_IMediaEvent, (void **) &media_event);
1200     if (r != S_OK) {
1201         av_log(avctx, AV_LOG_ERROR, "Could not get media event.\n");
1202         goto error;
1203     }
1204     ctx->media_event = media_event;
1205
1206     r = IMediaEvent_GetEventHandle(media_event, (void *) &media_event_handle);
1207     if (r != S_OK) {
1208         av_log(avctx, AV_LOG_ERROR, "Could not get media event handle.\n");
1209         goto error;
1210     }
1211     proc = GetCurrentProcess();
1212     r = DuplicateHandle(proc, media_event_handle, proc, &ctx->event[0],
1213                         0, 0, DUPLICATE_SAME_ACCESS);
1214     if (!r) {
1215         av_log(avctx, AV_LOG_ERROR, "Could not duplicate media event handle.\n");
1216         goto error;
1217     }
1218
1219     r = IMediaControl_Run(control);
1220     if (r == S_FALSE) {
1221         OAFilterState pfs;
1222         r = IMediaControl_GetState(control, 0, &pfs);
1223     }
1224     if (r != S_OK) {
1225         av_log(avctx, AV_LOG_ERROR, "Could not run graph (sometimes caused by a device already in use by other application)\n");
1226         goto error;
1227     }
1228
1229     ret = 0;
1230
1231 error:
1232
1233     if (devenum)
1234         ICreateDevEnum_Release(devenum);
1235
1236     if (ret < 0)
1237         dshow_read_close(avctx);
1238
1239     return ret;
1240 }
1241
1242 /**
1243  * Checks media events from DirectShow and returns -1 on error or EOF. Also
1244  * purges all events that might be in the event queue to stop the trigger
1245  * of event notification.
1246  */
1247 static int dshow_check_event_queue(IMediaEvent *media_event)
1248 {
1249     LONG_PTR p1, p2;
1250     long code;
1251     int ret = 0;
1252
1253     while (IMediaEvent_GetEvent(media_event, &code, &p1, &p2, 0) != E_ABORT) {
1254         if (code == EC_COMPLETE || code == EC_DEVICE_LOST || code == EC_ERRORABORT)
1255             ret = -1;
1256         IMediaEvent_FreeEventParams(media_event, code, p1, p2);
1257     }
1258
1259     return ret;
1260 }
1261
1262 static int dshow_read_packet(AVFormatContext *s, AVPacket *pkt)
1263 {
1264     struct dshow_ctx *ctx = s->priv_data;
1265     AVPacketList *pktl = NULL;
1266
1267     while (!ctx->eof && !pktl) {
1268         WaitForSingleObject(ctx->mutex, INFINITE);
1269         pktl = ctx->pktl;
1270         if (pktl) {
1271             *pkt = pktl->pkt;
1272             ctx->pktl = ctx->pktl->next;
1273             av_free(pktl);
1274             ctx->curbufsize[pkt->stream_index] -= pkt->size;
1275         }
1276         ResetEvent(ctx->event[1]);
1277         ReleaseMutex(ctx->mutex);
1278         if (!pktl) {
1279             if (dshow_check_event_queue(ctx->media_event) < 0) {
1280                 ctx->eof = 1;
1281             } else if (s->flags & AVFMT_FLAG_NONBLOCK) {
1282                 return AVERROR(EAGAIN);
1283             } else {
1284                 WaitForMultipleObjects(2, ctx->event, 0, INFINITE);
1285             }
1286         }
1287     }
1288
1289     return ctx->eof ? AVERROR(EIO) : pkt->size;
1290 }
1291
1292 #define OFFSET(x) offsetof(struct dshow_ctx, x)
1293 #define DEC AV_OPT_FLAG_DECODING_PARAM
1294 static const AVOption options[] = {
1295     { "video_size", "set video size given a string such as 640x480 or hd720.", OFFSET(requested_width), AV_OPT_TYPE_IMAGE_SIZE, {.str = NULL}, 0, 0, DEC },
1296     { "pixel_format", "set video pixel format", OFFSET(pixel_format), AV_OPT_TYPE_PIXEL_FMT, {.i64 = AV_PIX_FMT_NONE}, -1, INT_MAX, DEC },
1297     { "framerate", "set video frame rate", OFFSET(framerate), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
1298     { "sample_rate", "set audio sample rate", OFFSET(sample_rate), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, DEC },
1299     { "sample_size", "set audio sample size", OFFSET(sample_size), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 16, DEC },
1300     { "channels", "set number of audio channels, such as 1 or 2", OFFSET(channels), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, DEC },
1301     { "audio_buffer_size", "set audio device buffer latency size in milliseconds (default is the device's default)", OFFSET(audio_buffer_size), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, DEC },
1302     { "list_devices", "list available devices",                      OFFSET(list_devices), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, DEC },
1303     { "list_options", "list available options for specified device", OFFSET(list_options), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, DEC },
1304     { "video_device_number", "set video device number for devices with same name (starts at 0)", OFFSET(video_device_number), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, DEC },
1305     { "audio_device_number", "set audio device number for devices with same name (starts at 0)", OFFSET(audio_device_number), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, DEC },
1306     { "video_pin_name", "select video capture pin by name", OFFSET(video_pin_name),AV_OPT_TYPE_STRING, {.str = NULL},  0, 0, AV_OPT_FLAG_ENCODING_PARAM },
1307     { "audio_pin_name", "select audio capture pin by name", OFFSET(audio_pin_name),AV_OPT_TYPE_STRING, {.str = NULL},  0, 0, AV_OPT_FLAG_ENCODING_PARAM },
1308     { "crossbar_video_input_pin_number", "set video input pin number for crossbar device", OFFSET(crossbar_video_input_pin_number), AV_OPT_TYPE_INT, {.i64 = -1}, -1, INT_MAX, DEC },
1309     { "crossbar_audio_input_pin_number", "set audio input pin number for crossbar device", OFFSET(crossbar_audio_input_pin_number), AV_OPT_TYPE_INT, {.i64 = -1}, -1, INT_MAX, DEC },
1310     { "show_video_device_dialog",              "display property dialog for video capture device",                            OFFSET(show_video_device_dialog),              AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, DEC },
1311     { "show_audio_device_dialog",              "display property dialog for audio capture device",                            OFFSET(show_audio_device_dialog),              AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, DEC },
1312     { "show_video_crossbar_connection_dialog", "display property dialog for crossbar connecting pins filter on video device", OFFSET(show_video_crossbar_connection_dialog), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, DEC },
1313     { "show_audio_crossbar_connection_dialog", "display property dialog for crossbar connecting pins filter on audio device", OFFSET(show_audio_crossbar_connection_dialog), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, DEC },
1314     { "show_analog_tv_tuner_dialog",           "display property dialog for analog tuner filter",                             OFFSET(show_analog_tv_tuner_dialog),           AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, DEC },
1315     { "show_analog_tv_tuner_audio_dialog",     "display property dialog for analog tuner audio filter",                       OFFSET(show_analog_tv_tuner_audio_dialog),     AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, DEC },
1316     { "audio_device_load", "load audio capture filter device (and properties) from file", OFFSET(audio_filter_load_file), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
1317     { "audio_device_save", "save audio capture filter device (and properties) to file", OFFSET(audio_filter_save_file), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
1318     { "video_device_load", "load video capture filter device (and properties) from file", OFFSET(video_filter_load_file), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
1319     { "video_device_save", "save video capture filter device (and properties) to file", OFFSET(video_filter_save_file), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
1320     { NULL },
1321 };
1322
1323 static const AVClass dshow_class = {
1324     .class_name = "dshow indev",
1325     .item_name  = av_default_item_name,
1326     .option     = options,
1327     .version    = LIBAVUTIL_VERSION_INT,
1328     .category   = AV_CLASS_CATEGORY_DEVICE_VIDEO_INPUT,
1329 };
1330
1331 AVInputFormat ff_dshow_demuxer = {
1332     .name           = "dshow",
1333     .long_name      = NULL_IF_CONFIG_SMALL("DirectShow capture"),
1334     .priv_data_size = sizeof(struct dshow_ctx),
1335     .read_header    = dshow_read_header,
1336     .read_packet    = dshow_read_packet,
1337     .read_close     = dshow_read_close,
1338     .flags          = AVFMT_NOFILE,
1339     .priv_class     = &dshow_class,
1340 };