modules/codec/mft.c

   1 /*****************************************************************************
   2  * mft.c : Media Foundation Transform audio/video decoder
   3  *****************************************************************************
   4  * Copyright (C) 2014 VLC authors and VideoLAN
   5  *
   6  * Author: Felix Abecassis <felix.abecassis@gmail.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify it
   9  * under the terms of the GNU Lesser General Public License as published by
  10  * the Free Software Foundation; either version 2.1 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program 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
  16  * GNU Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public License
  19  * along with this program; if not, write to the Free Software Foundation,
  20  * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  21  *****************************************************************************/
  22
  23 #ifdef HAVE_CONFIG_H
  24 # include "config.h"
  25 #endif
  26
  27 #undef WINVER
  28 #define WINVER 0x0601
  29
  30 /* Needed for many mingw macros. */
  31 #define COBJMACROS
  32
  33 /* Avoid having GUIDs being defined as "extern". */
  34 #define INITGUID
  35
  36 #ifndef STDCALL
  37 # define STDCALL __stdcall
  38 #endif
  39
  40 #include <winapifamily.h>
  41 #undef WINAPI_FAMILY
  42 #define WINAPI_FAMILY WINAPI_FAMILY_DESKTOP_APP
  43
  44 #include <assert.h>
  45
  46 #include <vlc_common.h>
  47 #include <vlc_plugin.h>
  48 #include <vlc_codec.h>
  49 #include "../packetizer/h264_nal.h"
  50 #define _VIDEOINFOHEADER_
  51 #include <vlc_codecs.h>
  52
  53 #include <mfapi.h>
  54 #include <mftransform.h>
  55 #include <mferror.h>
  56 #include <mfobjects.h>
  57
  58 static int  Open(vlc_object_t *);
  59 static void Close(vlc_object_t *);
  60
  61 vlc_module_begin()
  62     set_description(N_("Media Foundation Transform decoder"))
  63     add_shortcut("mft")
  64     set_capability("video decoder", 1)
  65     set_callbacks(Open, Close)
  66     set_category(CAT_INPUT)
  67     set_subcategory(SUBCAT_INPUT_VCODEC)
  68
  69     add_submodule()
  70     add_shortcut("mft")
  71     set_capability("audio decoder", 1)
  72     set_callbacks(Open, Close)
  73 vlc_module_end()
  74
  75 typedef struct
  76 {
  77     HINSTANCE mfplat_dll;
  78     HRESULT (STDCALL *fptr_MFTEnumEx)(GUID guidCategory, UINT32 Flags,
  79                                  const MFT_REGISTER_TYPE_INFO *pInputType,
  80                                  const MFT_REGISTER_TYPE_INFO *pOutputType,
  81                                  IMFActivate ***pppMFTActivate, UINT32 *pcMFTActivate);
  82     HRESULT (STDCALL *fptr_MFCreateSample)(IMFSample **ppIMFSample);
  83     HRESULT (STDCALL *fptr_MFCreateMemoryBuffer)(DWORD cbMaxLength, IMFMediaBuffer **ppBuffer);
  84     HRESULT (STDCALL *fptr_MFCreateAlignedMemoryBuffer)(DWORD cbMaxLength, DWORD fAlignmentFlags, IMFMediaBuffer **ppBuffer);
  85 } MFHandle;
  86
  87 typedef struct
  88 {
  89     MFHandle mf_handle;
  90
  91     IMFTransform *mft;
  92
  93     const GUID* major_type;
  94     const GUID* subtype;
  95     /* Container for a dynamically constructed subtype */
  96     GUID custom_subtype;
  97
  98     /* For asynchronous MFT */
  99     bool is_async;
 100     IMFMediaEventGenerator *event_generator;
 101     int pending_input_events;
 102     int pending_output_events;
 103
 104     /* Input stream */
 105     DWORD input_stream_id;
 106     IMFMediaType *input_type;
 107
 108     /* Output stream */
 109     DWORD output_stream_id;
 110     IMFSample *output_sample;
 111     IMFMediaType *output_type;
 112
 113     /* H264 only. */
 114     uint8_t nal_length_size;
 115 } decoder_sys_t;
 116
 117 static const int pi_channels_maps[9] =
 118 {
 119     0,
 120     AOUT_CHAN_CENTER,
 121     AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT,
 122     AOUT_CHAN_CENTER | AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT,
 123     AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_REARLEFT
 124      | AOUT_CHAN_REARRIGHT,
 125     AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
 126      | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT,
 127     AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
 128      | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT | AOUT_CHAN_LFE,
 129     AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
 130      | AOUT_CHAN_REARCENTER | AOUT_CHAN_MIDDLELEFT
 131      | AOUT_CHAN_MIDDLERIGHT | AOUT_CHAN_LFE,
 132     AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER | AOUT_CHAN_REARLEFT
 133      | AOUT_CHAN_REARRIGHT | AOUT_CHAN_MIDDLELEFT | AOUT_CHAN_MIDDLERIGHT
 134      | AOUT_CHAN_LFE,
 135 };
 136
 137 /* Possibly missing from mingw headers */
 138 #ifndef MF_E_TRANSFORM_NEED_MORE_INPUT
 139 # define MF_E_TRANSFORM_NEED_MORE_INPUT _HRESULT_TYPEDEF_(0xc00d6d72)
 140 #endif
 141
 142 #ifndef MF_E_TRANSFORM_STREAM_CHANGE
 143 # define MF_E_TRANSFORM_STREAM_CHANGE _HRESULT_TYPEDEF_(0xc00d6d61)
 144 #endif
 145
 146 #ifndef MF_E_NO_EVENTS_AVAILABLE
 147 # define MF_E_NO_EVENTS_AVAILABLE _HRESULT_TYPEDEF_(0xC00D3E80L)
 148 #endif
 149
 150 #ifndef MF_EVENT_FLAG_NO_WAIT
 151 # define MF_EVENT_FLAG_NO_WAIT 0x00000001
 152 #endif
 153
 154 /*
 155  * The MFTransformXXX values might not be defined in mingw headers,
 156  * thus we use our own enum with the VLC prefix.
 157  */
 158 enum
 159 {
 160     VLC_METransformUnknown = 600,
 161     VLC_METransformNeedInput,
 162     VLC_METransformHaveOutput,
 163     VLC_METransformDrainComplete,
 164     VLC_METransformMarker,
 165 };
 166
 167 typedef struct
 168 {
 169     vlc_fourcc_t fourcc;
 170     const GUID   *guid;
 171 } pair_format_guid;
 172
 173 /*
 174  * We need this table since the FOURCC used for GUID is not the same
 175  * as the FOURCC used by VLC, for instance h264 vs H264.
 176  */
 177 static const pair_format_guid video_format_table[] =
 178 {
 179     { VLC_CODEC_H264, &MFVideoFormat_H264 },
 180     { VLC_CODEC_MJPG, &MFVideoFormat_MJPG },
 181     { VLC_CODEC_WMV1, &MFVideoFormat_WMV1 },
 182     { VLC_CODEC_WMV2, &MFVideoFormat_WMV2 },
 183     { VLC_CODEC_WMV3, &MFVideoFormat_WMV3 },
 184     { VLC_CODEC_VC1,  &MFVideoFormat_WVC1 },
 185     { 0, NULL }
 186 };
 187
 188 // 8-bit luminance only
 189 DEFINE_MEDIATYPE_GUID (MFVideoFormat_L8, 50);
 190
 191 /*
 192  * Table to map MF Transform raw 3D3 output formats to native VLC FourCC
 193  */
 194 static const pair_format_guid d3d_format_table[] = {
 195     { VLC_CODEC_RGB32, &MFVideoFormat_RGB32  },
 196     { VLC_CODEC_RGB24, &MFVideoFormat_RGB24  },
 197     { VLC_CODEC_RGBA,  &MFVideoFormat_ARGB32 },
 198     { VLC_CODEC_GREY,  &MFVideoFormat_L8     },
 199     { 0, NULL }
 200 };
 201
 202 #if defined(__MINGW64_VERSION_MAJOR) && __MINGW64_VERSION_MAJOR < 4
 203 DEFINE_GUID(MFAudioFormat_Dolby_AC3, 0xe06d802c, 0xdb46, 0x11cf, 0xb4, 0xd1, 0x00, 0x80, 0x5f, 0x6c, 0xbb, 0xea);
 204 #endif
 205 /*
 206  * We cannot use the FOURCC code for audio either since the
 207  * WAVE_FORMAT value is used to create the GUID.
 208  */
 209 static const pair_format_guid audio_format_table[] =
 210 {
 211     { VLC_CODEC_MPGA, &MFAudioFormat_MPEG      },
 212     { VLC_CODEC_MP3,  &MFAudioFormat_MP3       },
 213     { VLC_CODEC_DTS,  &MFAudioFormat_DTS       },
 214     { VLC_CODEC_MP4A, &MFAudioFormat_AAC       },
 215     { VLC_CODEC_WMA2, &MFAudioFormat_WMAudioV8 },
 216     { VLC_CODEC_A52,  &MFAudioFormat_Dolby_AC3 },
 217     { 0, NULL }
 218 };
 219
 220 static const GUID *FormatToGUID(const pair_format_guid table[], vlc_fourcc_t fourcc)
 221 {
 222     for (int i = 0; table[i].fourcc; ++i)
 223         if (table[i].fourcc == fourcc)
 224             return table[i].guid;
 225
 226     return NULL;
 227 }
 228
 229 static vlc_fourcc_t GUIDToFormat(const pair_format_guid table[], const GUID* guid)
 230 {
 231     for (int i = 0; table[i].fourcc; ++i)
 232         if (IsEqualGUID(table[i].guid, guid))
 233             return table[i].fourcc;
 234
 235     return 0;
 236 }
 237
 238 /*
 239  * Low latency mode for Windows 8. Without this option, the H264
 240  * decoder will fill *all* its internal buffers before returning a
 241  * frame. Because of this behavior, the decoder might return no frame
 242  * for more than 500 ms, making it unusable for playback.
 243  */
 244 DEFINE_GUID(CODECAPI_AVLowLatencyMode, 0x9c27891a, 0xed7a, 0x40e1, 0x88, 0xe8, 0xb2, 0x27, 0x27, 0xa0, 0x24, 0xee);
 245
 246 static int SetInputType(decoder_t *p_dec, DWORD stream_id, IMFMediaType **result)
 247 {
 248     decoder_sys_t *p_sys = p_dec->p_sys;
 249     HRESULT hr;
 250
 251     *result = NULL;
 252
 253     IMFMediaType *input_media_type = NULL;
 254
 255     /* Search a suitable input type for the MFT. */
 256     int input_type_index = 0;
 257     bool found = false;
 258     for (int i = 0; !found; ++i)
 259     {
 260         hr = IMFTransform_GetInputAvailableType(p_sys->mft, stream_id, i, &input_media_type);
 261         if (hr == MF_E_NO_MORE_TYPES)
 262             break;
 263         else if (hr == MF_E_TRANSFORM_TYPE_NOT_SET)
 264         {
 265             /* The output type must be set before setting the input type for this MFT. */
 266             return VLC_SUCCESS;
 267         }
 268         else if (FAILED(hr))
 269             goto error;
 270
 271         GUID subtype;
 272         hr = IMFMediaType_GetGUID(input_media_type, &MF_MT_SUBTYPE, &subtype);
 273         if (FAILED(hr))
 274             goto error;
 275
 276         if (IsEqualGUID(&subtype, p_sys->subtype))
 277             found = true;
 278
 279         if (found)
 280             input_type_index = i;
 281
 282         IMFMediaType_Release(input_media_type);
 283         input_media_type = NULL;
 284     }
 285     if (!found)
 286         goto error;
 287
 288     hr = IMFTransform_GetInputAvailableType(p_sys->mft, stream_id, input_type_index, &input_media_type);
 289     if (FAILED(hr))
 290         goto error;
 291
 292     if (p_dec->fmt_in.i_cat == VIDEO_ES)
 293     {
 294         UINT64 width = p_dec->fmt_in.video.i_width;
 295         UINT64 height = p_dec->fmt_in.video.i_height;
 296         UINT64 frame_size = (width << 32) | height;
 297         hr = IMFMediaType_SetUINT64(input_media_type, &MF_MT_FRAME_SIZE, frame_size);
 298         if (FAILED(hr))
 299             goto error;
 300
 301         /* Some transforms like to know the frame rate and may reject the input type otherwise. */
 302         UINT64 frame_ratio_num = p_dec->fmt_in.video.i_frame_rate;
 303         UINT64 frame_ratio_dem = p_dec->fmt_in.video.i_frame_rate_base;
 304         if(frame_ratio_num && frame_ratio_dem) {
 305             UINT64 frame_rate = (frame_ratio_num << 32) | frame_ratio_dem;
 306             hr = IMFMediaType_SetUINT64(input_media_type, &MF_MT_FRAME_RATE, frame_rate);
 307             if(FAILED(hr))
 308                 goto error;
 309         }
 310     }
 311     else
 312     {
 313         hr = IMFMediaType_SetUINT32(input_media_type, &MF_MT_ORIGINAL_WAVE_FORMAT_TAG, p_sys->subtype->Data1);
 314         if (FAILED(hr))
 315             goto error;
 316         if (p_dec->fmt_in.audio.i_rate)
 317         {
 318             hr = IMFMediaType_SetUINT32(input_media_type, &MF_MT_AUDIO_SAMPLES_PER_SECOND, p_dec->fmt_in.audio.i_rate);
 319             if (FAILED(hr))
 320                 goto error;
 321         }
 322         if (p_dec->fmt_in.audio.i_channels)
 323         {
 324             hr = IMFMediaType_SetUINT32(input_media_type, &MF_MT_AUDIO_NUM_CHANNELS, p_dec->fmt_in.audio.i_channels);
 325             if (FAILED(hr))
 326                 goto error;
 327         }
 328         if (p_dec->fmt_in.audio.i_bitspersample)
 329         {
 330             hr = IMFMediaType_SetUINT32(input_media_type, &MF_MT_AUDIO_BITS_PER_SAMPLE, p_dec->fmt_in.audio.i_bitspersample);
 331             if (FAILED(hr))
 332                 goto error;
 333         }
 334         if (p_dec->fmt_in.audio.i_blockalign)
 335         {
 336             hr = IMFMediaType_SetUINT32(input_media_type, &MF_MT_AUDIO_BLOCK_ALIGNMENT, p_dec->fmt_in.audio.i_blockalign);
 337             if (FAILED(hr))
 338                 goto error;
 339         }
 340         if (p_dec->fmt_in.i_bitrate)
 341         {
 342             hr = IMFMediaType_SetUINT32(input_media_type, &MF_MT_AUDIO_AVG_BYTES_PER_SECOND, p_dec->fmt_in.i_bitrate / 8);
 343             if (FAILED(hr))
 344                 goto error;
 345         }
 346     }
 347
 348     if (p_dec->fmt_in.i_extra > 0)
 349     {
 350         UINT32 blob_size = 0;
 351         hr = IMFMediaType_GetBlobSize(input_media_type, &MF_MT_USER_DATA, &blob_size);
 352         /*
 353          * Do not overwrite existing user data in the input type, this
 354          * can cause the MFT to reject the type.
 355          */
 356         if (hr == MF_E_ATTRIBUTENOTFOUND)
 357         {
 358             hr = IMFMediaType_SetBlob(input_media_type, &MF_MT_USER_DATA,
 359                                       (const UINT8*)p_dec->fmt_in.p_extra, p_dec->fmt_in.i_extra);
 360             if (FAILED(hr))
 361                 goto error;
 362         }
 363     }
 364
 365     hr = IMFTransform_SetInputType(p_sys->mft, stream_id, input_media_type, 0);
 366     if (FAILED(hr))
 367         goto error;
 368
 369     *result = input_media_type;
 370
 371     return VLC_SUCCESS;
 372
 373 error:
 374     msg_Err(p_dec, "Error in SetInputType()");
 375     if (input_media_type)
 376         IMFMediaType_Release(input_media_type);
 377     return VLC_EGENERIC;
 378 }
 379
 380 static int SetOutputType(decoder_t *p_dec, DWORD stream_id, IMFMediaType **result)
 381 {
 382     decoder_sys_t *p_sys = p_dec->p_sys;
 383     HRESULT hr;
 384
 385     *result = NULL;
 386
 387     IMFMediaType *output_media_type = NULL;
 388
 389     /*
 390      * Enumerate available output types. The list is ordered by
 391      * preference thus we will use the first one unless YV12/I420 is
 392      * available for video or float32 for audio.
 393      */
 394     int output_type_index = -1;
 395     bool found = false;
 396     for (int i = 0; !found; ++i)
 397     {
 398         hr = IMFTransform_GetOutputAvailableType(p_sys->mft, stream_id, i, &output_media_type);
 399         if (hr == MF_E_NO_MORE_TYPES)
 400             break;
 401         else if (hr == MF_E_TRANSFORM_TYPE_NOT_SET)
 402         {
 403             /* The input type must be set before setting the output type for this MFT. */
 404             return VLC_SUCCESS;
 405         }
 406         else if (FAILED(hr))
 407             goto error;
 408
 409         GUID subtype;
 410         hr = IMFMediaType_GetGUID(output_media_type, &MF_MT_SUBTYPE, &subtype);
 411         if (FAILED(hr))
 412             goto error;
 413
 414         if (p_dec->fmt_in.i_cat == VIDEO_ES)
 415         {
 416             if (IsEqualGUID(&subtype, &MFVideoFormat_YV12) || IsEqualGUID(&subtype, &MFVideoFormat_I420))
 417                 found = true;
 418             /* Transform might offer output in a D3DFMT propietary FCC. If we can
 419              * use it, fall back to it in case we do not find YV12 or I420 */
 420             else if(output_type_index < 0 && GUIDToFormat(d3d_format_table, &subtype) > 0)
 421                     output_type_index = i;
 422         }
 423         else
 424         {
 425             UINT32 bits_per_sample;
 426             hr = IMFMediaType_GetUINT32(output_media_type, &MF_MT_AUDIO_BITS_PER_SAMPLE, &bits_per_sample);
 427             if (FAILED(hr))
 428                 continue;
 429             if (bits_per_sample == 32 && IsEqualGUID(&subtype, &MFAudioFormat_Float))
 430                 found = true;
 431         }
 432
 433         if (found)
 434             output_type_index = i;
 435
 436         IMFMediaType_Release(output_media_type);
 437         output_media_type = NULL;
 438     }
 439     /*
 440      * It's not an error if we don't find the output type we were
 441      * looking for, in this case we use the first available type.
 442      */
 443     if(output_type_index < 0)
 444         /* No output format found we prefer, just pick the first one preferred
 445          * by the MFT */
 446         output_type_index = 0;
 447
 448     hr = IMFTransform_GetOutputAvailableType(p_sys->mft, stream_id, output_type_index, &output_media_type);
 449     if (FAILED(hr))
 450         goto error;
 451
 452     hr = IMFTransform_SetOutputType(p_sys->mft, stream_id, output_media_type, 0);
 453     if (FAILED(hr))
 454         goto error;
 455
 456     GUID subtype;
 457     hr = IMFMediaType_GetGUID(output_media_type, &MF_MT_SUBTYPE, &subtype);
 458     if (FAILED(hr))
 459         goto error;
 460
 461     if (p_dec->fmt_in.i_cat == VIDEO_ES)
 462     {
 463         video_format_Copy( &p_dec->fmt_out.video, &p_dec->fmt_in.video );
 464
 465         /* Transform might offer output in a D3DFMT propietary FCC */
 466         vlc_fourcc_t fcc = GUIDToFormat(d3d_format_table, &subtype);
 467         if(fcc) {
 468             /* D3D formats are upside down */
 469             p_dec->fmt_out.video.orientation = ORIENT_BOTTOM_LEFT;
 470         } else {
 471             fcc = vlc_fourcc_GetCodec(p_dec->fmt_in.i_cat, subtype.Data1);
 472         }
 473
 474         p_dec->fmt_out.i_codec = fcc;
 475     }
 476     else
 477     {
 478         p_dec->fmt_out.audio = p_dec->fmt_in.audio;
 479
 480         UINT32 bitspersample = 0;
 481         hr = IMFMediaType_GetUINT32(output_media_type, &MF_MT_AUDIO_BITS_PER_SAMPLE, &bitspersample);
 482         if (SUCCEEDED(hr) && bitspersample)
 483             p_dec->fmt_out.audio.i_bitspersample = bitspersample;
 484
 485         UINT32 channels = 0;
 486         hr = IMFMediaType_GetUINT32(output_media_type, &MF_MT_AUDIO_NUM_CHANNELS, &channels);
 487         if (SUCCEEDED(hr) && channels)
 488             p_dec->fmt_out.audio.i_channels = channels;
 489
 490         UINT32 rate = 0;
 491         hr = IMFMediaType_GetUINT32(output_media_type, &MF_MT_AUDIO_SAMPLES_PER_SECOND, &rate);
 492         if (SUCCEEDED(hr) && rate)
 493             p_dec->fmt_out.audio.i_rate = rate;
 494
 495         vlc_fourcc_t fourcc;
 496         wf_tag_to_fourcc(subtype.Data1, &fourcc, NULL);
 497         p_dec->fmt_out.i_codec = vlc_fourcc_GetCodecAudio(fourcc, p_dec->fmt_out.audio.i_bitspersample);
 498
 499         p_dec->fmt_out.audio.i_physical_channels = pi_channels_maps[p_dec->fmt_out.audio.i_channels];
 500     }
 501
 502     *result = output_media_type;
 503
 504     return VLC_SUCCESS;
 505
 506 error:
 507     msg_Err(p_dec, "Error in SetOutputType()");
 508     if (output_media_type)
 509         IMFMediaType_Release(output_media_type);
 510     return VLC_EGENERIC;
 511 }
 512
 513 static int AllocateInputSample(decoder_t *p_dec, DWORD stream_id, IMFSample** result, DWORD size)
 514 {
 515     decoder_sys_t *p_sys = p_dec->p_sys;
 516     MFHandle *mf = &p_sys->mf_handle;
 517     HRESULT hr;
 518
 519     *result = NULL;
 520
 521     IMFSample *input_sample = NULL;
 522
 523     MFT_INPUT_STREAM_INFO input_info;
 524     hr = IMFTransform_GetInputStreamInfo(p_sys->mft, stream_id, &input_info);
 525     if (FAILED(hr))
 526         goto error;
 527
 528     hr = mf->fptr_MFCreateSample(&input_sample);
 529     if (FAILED(hr))
 530         goto error;
 531
 532     IMFMediaBuffer *input_media_buffer = NULL;
 533     DWORD allocation_size = __MAX(input_info.cbSize, size);
 534     hr = mf->fptr_MFCreateMemoryBuffer(allocation_size, &input_media_buffer);
 535     if (FAILED(hr))
 536         goto error;
 537
 538     hr = IMFSample_AddBuffer(input_sample, input_media_buffer);
 539     IMFMediaBuffer_Release(input_media_buffer);
 540     if (FAILED(hr))
 541         goto error;
 542
 543     *result = input_sample;
 544
 545     return VLC_SUCCESS;
 546
 547 error:
 548     msg_Err(p_dec, "Error in AllocateInputSample()");
 549     if (input_sample)
 550         IMFSample_Release(input_sample);
 551     if (input_media_buffer)
 552         IMFMediaBuffer_Release(input_media_buffer);
 553     return VLC_EGENERIC;
 554 }
 555
 556 static int AllocateOutputSample(decoder_t *p_dec, DWORD stream_id, IMFSample **result)
 557 {
 558     decoder_sys_t *p_sys = p_dec->p_sys;
 559     MFHandle *mf = &p_sys->mf_handle;
 560     HRESULT hr;
 561
 562     *result = NULL;
 563
 564     IMFSample *output_sample = NULL;
 565
 566     MFT_OUTPUT_STREAM_INFO output_info;
 567     hr = IMFTransform_GetOutputStreamInfo(p_sys->mft, stream_id, &output_info);
 568     if (FAILED(hr))
 569         goto error;
 570
 571     if (output_info.dwFlags & (MFT_OUTPUT_STREAM_PROVIDES_SAMPLES | MFT_OUTPUT_STREAM_CAN_PROVIDE_SAMPLES))
 572     {
 573         /* The MFT will provide an allocated sample. */
 574         return VLC_SUCCESS;
 575     }
 576
 577     DWORD expected_flags = 0;
 578     if (p_dec->fmt_in.i_cat == VIDEO_ES)
 579         expected_flags |= MFT_OUTPUT_STREAM_WHOLE_SAMPLES
 580                         | MFT_OUTPUT_STREAM_SINGLE_SAMPLE_PER_BUFFER
 581                         | MFT_OUTPUT_STREAM_FIXED_SAMPLE_SIZE;
 582     if ((output_info.dwFlags & expected_flags) != expected_flags)
 583         goto error;
 584
 585     hr = mf->fptr_MFCreateSample(&output_sample);
 586     if (FAILED(hr))
 587         goto error;
 588
 589     IMFMediaBuffer *output_media_buffer = NULL;
 590     DWORD allocation_size = output_info.cbSize;
 591     DWORD alignment = output_info.cbAlignment;
 592     if (alignment > 0)
 593         hr = mf->fptr_MFCreateAlignedMemoryBuffer(allocation_size, alignment - 1, &output_media_buffer);
 594     else
 595         hr = mf->fptr_MFCreateMemoryBuffer(allocation_size, &output_media_buffer);
 596     if (FAILED(hr))
 597         goto error;
 598
 599     hr = IMFSample_AddBuffer(output_sample, output_media_buffer);
 600     if (FAILED(hr))
 601         goto error;
 602
 603     *result = output_sample;
 604
 605     return VLC_SUCCESS;
 606
 607 error:
 608     msg_Err(p_dec, "Error in AllocateOutputSample()");
 609     if (output_sample)
 610         IMFSample_Release(output_sample);
 611     return VLC_EGENERIC;
 612 }
 613
 614 static int ProcessInputStream(decoder_t *p_dec, DWORD stream_id, block_t *p_block)
 615 {
 616     decoder_sys_t *p_sys = p_dec->p_sys;
 617     HRESULT hr;
 618     IMFSample *input_sample = NULL;
 619
 620     if (AllocateInputSample(p_dec, stream_id, &input_sample, p_block->i_buffer))
 621         goto error;
 622
 623     IMFMediaBuffer *input_media_buffer = NULL;
 624     hr = IMFSample_GetBufferByIndex(input_sample, 0, &input_media_buffer);
 625     if (FAILED(hr))
 626         goto error;
 627
 628     BYTE *buffer_start;
 629     hr = IMFMediaBuffer_Lock(input_media_buffer, &buffer_start, NULL, NULL);
 630     if (FAILED(hr))
 631         goto error;
 632
 633     memcpy(buffer_start, p_block->p_buffer, p_block->i_buffer);
 634
 635     if (p_dec->fmt_in.i_codec == VLC_CODEC_H264)
 636     {
 637         /* in-place NAL to annex B conversion. */
 638         h264_AVC_to_AnnexB(buffer_start, p_block->i_buffer, p_sys->nal_length_size);
 639     }
 640
 641     hr = IMFMediaBuffer_Unlock(input_media_buffer);
 642     if (FAILED(hr))
 643         goto error;
 644
 645     hr = IMFMediaBuffer_SetCurrentLength(input_media_buffer, p_block->i_buffer);
 646     if (FAILED(hr))
 647         goto error;
 648
 649     LONGLONG ts = p_block->i_pts;
 650     if (!ts && p_block->i_dts)
 651         ts = p_block->i_dts;
 652
 653     /* Convert from microseconds to 100 nanoseconds unit. */
 654     hr = IMFSample_SetSampleTime(input_sample, ts * 10);
 655     if (FAILED(hr))
 656         goto error;
 657
 658     hr = IMFTransform_ProcessInput(p_sys->mft, stream_id, input_sample, 0);
 659     if (FAILED(hr))
 660         goto error;
 661
 662     IMFMediaBuffer_Release(input_media_buffer);
 663     IMFSample_Release(input_sample);
 664
 665     return VLC_SUCCESS;
 666
 667 error:
 668     msg_Err(p_dec, "Error in ProcessInputStream()");
 669     if (input_sample)
 670         IMFSample_Release(input_sample);
 671     return VLC_EGENERIC;
 672 }
 673
 674 /* Copy a packed buffer (no padding) to a picture_t */
 675 static void CopyPackedBufferToPicture(picture_t *p_pic, const uint8_t *p_src)
 676 {
 677     for (int i = 0; i < p_pic->i_planes; ++i)
 678     {
 679         uint8_t *p_dst = p_pic->p[i].p_pixels;
 680
 681         if (p_pic->p[i].i_visible_pitch == p_pic->p[i].i_pitch)
 682         {
 683             /* Plane is packed, only one memcpy is needed. */
 684             uint32_t plane_size = p_pic->p[i].i_pitch * p_pic->p[i].i_visible_lines;
 685             memcpy(p_dst, p_src, plane_size);
 686             p_src += plane_size;
 687             continue;
 688         }
 689
 690         for (int i_line = 0; i_line < p_pic->p[i].i_visible_lines; i_line++)
 691         {
 692             memcpy(p_dst, p_src, p_pic->p[i].i_visible_pitch);
 693             p_src += p_pic->p[i].i_visible_pitch;
 694             p_dst += p_pic->p[i].i_pitch;
 695         }
 696     }
 697 }
 698
 699 static int ProcessOutputStream(decoder_t *p_dec, DWORD stream_id)
 700 {
 701     decoder_sys_t *p_sys = p_dec->p_sys;
 702     HRESULT hr;
 703     picture_t *picture = NULL;
 704     block_t *aout_buffer = NULL;
 705
 706     DWORD output_status = 0;
 707     MFT_OUTPUT_DATA_BUFFER output_buffer = { stream_id, p_sys->output_sample, 0, NULL };
 708     hr = IMFTransform_ProcessOutput(p_sys->mft, 0, 1, &output_buffer, &output_status);
 709     if (output_buffer.pEvents)
 710         IMFCollection_Release(output_buffer.pEvents);
 711     /* Use the returned sample since it can be provided by the MFT. */
 712     IMFSample *output_sample = output_buffer.pSample;
 713
 714     if (hr == S_OK)
 715     {
 716         if (!output_sample)
 717             return VLC_SUCCESS;
 718
 719         LONGLONG sample_time;
 720         hr = IMFSample_GetSampleTime(output_sample, &sample_time);
 721         if (FAILED(hr))
 722             goto error;
 723         /* Convert from 100 nanoseconds unit to microseconds. */
 724         sample_time /= 10;
 725
 726         DWORD total_length = 0;
 727         hr = IMFSample_GetTotalLength(output_sample, &total_length);
 728         if (FAILED(hr))
 729             goto error;
 730
 731         if (p_dec->fmt_in.i_cat == VIDEO_ES)
 732         {
 733             if (decoder_UpdateVideoFormat(p_dec))
 734                 return VLC_SUCCESS;
 735             picture = decoder_NewPicture(p_dec);
 736             if (!picture)
 737                 return VLC_SUCCESS;
 738
 739             UINT32 interlaced = false;
 740             hr = IMFSample_GetUINT32(output_sample, &MFSampleExtension_Interlaced, &interlaced);
 741             picture->b_progressive = !interlaced;
 742
 743             picture->date = sample_time;
 744         }
 745         else
 746         {
 747             if (decoder_UpdateAudioFormat(p_dec))
 748                 goto error;
 749             if (p_dec->fmt_out.audio.i_bitspersample == 0 || p_dec->fmt_out.audio.i_channels == 0)
 750                 goto error;
 751             int samples = total_length / (p_dec->fmt_out.audio.i_bitspersample * p_dec->fmt_out.audio.i_channels / 8);
 752             aout_buffer = decoder_NewAudioBuffer(p_dec, samples);
 753             if (!aout_buffer)
 754                 return VLC_SUCCESS;
 755             if (aout_buffer->i_buffer < total_length)
 756                 goto error;
 757
 758             aout_buffer->i_pts = sample_time;
 759         }
 760
 761         IMFMediaBuffer *output_media_buffer = NULL;
 762         hr = IMFSample_GetBufferByIndex(output_sample, 0, &output_media_buffer);
 763
 764         BYTE *buffer_start;
 765         hr = IMFMediaBuffer_Lock(output_media_buffer, &buffer_start, NULL, NULL);
 766         if (FAILED(hr))
 767             goto error;
 768
 769         if (p_dec->fmt_in.i_cat == VIDEO_ES)
 770             CopyPackedBufferToPicture(picture, buffer_start);
 771         else
 772             memcpy(aout_buffer->p_buffer, buffer_start, total_length);
 773
 774         hr = IMFMediaBuffer_Unlock(output_media_buffer);
 775         IMFSample_Release(output_media_buffer);
 776         if (FAILED(hr))
 777             goto error;
 778
 779         if (p_sys->output_sample)
 780         {
 781             /* Sample is not provided by the MFT: clear its content. */
 782             hr = IMFMediaBuffer_SetCurrentLength(output_media_buffer, 0);
 783             if (FAILED(hr))
 784                 goto error;
 785         }
 786         else
 787         {
 788             /* Sample is provided by the MFT: decrease refcount. */
 789             IMFSample_Release(output_sample);
 790         }
 791     }
 792     else if (hr == MF_E_TRANSFORM_STREAM_CHANGE || hr == MF_E_TRANSFORM_TYPE_NOT_SET)
 793     {
 794         if (p_sys->output_type)
 795             IMFMediaType_Release(p_sys->output_type);
 796         if (SetOutputType(p_dec, p_sys->output_stream_id, &p_sys->output_type))
 797             goto error;
 798
 799         /* Reallocate output sample. */
 800         if (p_sys->output_sample)
 801             IMFSample_Release(p_sys->output_sample);
 802         p_sys->output_sample = NULL;
 803         if (AllocateOutputSample(p_dec, 0, &p_sys->output_sample))
 804             goto error;
 805         return VLC_SUCCESS;
 806     }
 807     else if (hr == MF_E_TRANSFORM_NEED_MORE_INPUT)
 808     {
 809         return VLC_SUCCESS;
 810     }
 811     else /* An error not listed above occurred */
 812     {
 813         msg_Err(p_dec, "Unexpected error in IMFTransform::ProcessOutput: %#lx",
 814                 hr);
 815         goto error;
 816     }
 817
 818     if (p_dec->fmt_in.i_cat == VIDEO_ES)
 819         decoder_QueueVideo(p_dec, picture);
 820     else
 821         decoder_QueueAudio(p_dec, aout_buffer);
 822
 823     return VLC_SUCCESS;
 824
 825 error:
 826     msg_Err(p_dec, "Error in ProcessOutputStream()");
 827     if (picture)
 828         picture_Release(picture);
 829     if (aout_buffer)
 830         block_Release(aout_buffer);
 831     return VLC_EGENERIC;
 832 }
 833
 834 static int DecodeSync(decoder_t *p_dec, block_t *p_block)
 835 {
 836     decoder_sys_t *p_sys = p_dec->p_sys;
 837
 838     if (!p_block) /* No Drain */
 839         return VLCDEC_SUCCESS;
 840
 841     if (p_block->i_flags & (BLOCK_FLAG_CORRUPTED))
 842     {
 843         block_Release(p_block);
 844         return VLCDEC_SUCCESS;
 845     }
 846
 847     /* Drain the output stream before sending the input packet. */
 848     if (ProcessOutputStream(p_dec, p_sys->output_stream_id))
 849         goto error;
 850     if (ProcessInputStream(p_dec, p_sys->input_stream_id, p_block))
 851         goto error;
 852     block_Release(p_block);
 853
 854     return VLCDEC_SUCCESS;
 855
 856 error:
 857     msg_Err(p_dec, "Error in DecodeSync()");
 858     block_Release(p_block);
 859     return VLCDEC_SUCCESS;
 860 }
 861
 862 static HRESULT DequeueMediaEvent(decoder_t *p_dec)
 863 {
 864     decoder_sys_t *p_sys = p_dec->p_sys;
 865     HRESULT hr;
 866
 867     IMFMediaEvent *event = NULL;
 868     hr = IMFMediaEventGenerator_GetEvent(p_sys->event_generator, MF_EVENT_FLAG_NO_WAIT, &event);
 869     if (FAILED(hr))
 870         return hr;
 871     MediaEventType event_type;
 872     hr = IMFMediaEvent_GetType(event, &event_type);
 873     IMFMediaEvent_Release(event);
 874     if (FAILED(hr))
 875         return hr;
 876
 877     if (event_type == VLC_METransformNeedInput)
 878         p_sys->pending_input_events += 1;
 879     else if (event_type == VLC_METransformHaveOutput)
 880         p_sys->pending_output_events += 1;
 881     else
 882         msg_Err(p_dec, "Unsupported asynchronous event.");
 883
 884     return S_OK;
 885 }
 886
 887 static int DecodeAsync(decoder_t *p_dec, block_t *p_block)
 888 {
 889     decoder_sys_t *p_sys = p_dec->p_sys;
 890     HRESULT hr;
 891
 892     if (!p_block) /* No Drain */
 893         return VLCDEC_SUCCESS;
 894
 895     if (p_block->i_flags & (BLOCK_FLAG_CORRUPTED))
 896     {
 897         block_Release(p_block);
 898         return VLCDEC_SUCCESS;
 899     }
 900
 901     /* Dequeue all pending media events. */
 902     while ((hr = DequeueMediaEvent(p_dec)) == S_OK)
 903         continue;
 904     if (hr != MF_E_NO_EVENTS_AVAILABLE && FAILED(hr))
 905         goto error;
 906
 907     /* Drain the output stream of the MFT before sending the input packet. */
 908     if (p_sys->pending_output_events > 0)
 909     {
 910         p_sys->pending_output_events -= 1;
 911         if (ProcessOutputStream(p_dec, p_sys->output_stream_id))
 912             goto error;
 913     }
 914
 915     /* Poll the MFT and return decoded frames until the input stream is ready. */
 916     while (p_sys->pending_input_events == 0)
 917     {
 918         hr = DequeueMediaEvent(p_dec);
 919         if (hr == MF_E_NO_EVENTS_AVAILABLE)
 920         {
 921             /* Sleep for 1 ms to avoid excessive polling. */
 922             Sleep(1);
 923             continue;
 924         }
 925         if (FAILED(hr))
 926             goto error;
 927
 928         if (p_sys->pending_output_events > 0)
 929         {
 930             p_sys->pending_output_events -= 1;
 931             if (ProcessOutputStream(p_dec, p_sys->output_stream_id))
 932                 goto error;
 933             break;
 934         }
 935     }
 936
 937     p_sys->pending_input_events -= 1;
 938     if (ProcessInputStream(p_dec, p_sys->input_stream_id, p_block))
 939         goto error;
 940
 941     block_Release(p_block);
 942
 943     return VLCDEC_SUCCESS;
 944
 945 error:
 946     msg_Err(p_dec, "Error in DecodeAsync()");
 947     block_Release(p_block);
 948     return VLCDEC_SUCCESS;
 949 }
 950
 951 static void DestroyMFT(decoder_t *p_dec);
 952
 953 static int InitializeMFT(decoder_t *p_dec)
 954 {
 955     decoder_sys_t *p_sys = p_dec->p_sys;
 956     HRESULT hr;
 957
 958     IMFAttributes *attributes = NULL;
 959     hr = IMFTransform_GetAttributes(p_sys->mft, &attributes);
 960     if (hr != E_NOTIMPL && FAILED(hr))
 961         goto error;
 962     if (SUCCEEDED(hr))
 963     {
 964         UINT32 is_async = false;
 965         hr = IMFAttributes_GetUINT32(attributes, &MF_TRANSFORM_ASYNC, &is_async);
 966         if (hr != MF_E_ATTRIBUTENOTFOUND && FAILED(hr))
 967             goto error;
 968         p_sys->is_async = is_async;
 969         if (p_sys->is_async)
 970         {
 971             hr = IMFAttributes_SetUINT32(attributes, &MF_TRANSFORM_ASYNC_UNLOCK, true);
 972             if (FAILED(hr))
 973                 goto error;
 974             hr = IMFTransform_QueryInterface(p_sys->mft, &IID_IMFMediaEventGenerator, (void**)&p_sys->event_generator);
 975             if (FAILED(hr))
 976                 goto error;
 977         }
 978     }
 979
 980     DWORD input_streams_count;
 981     DWORD output_streams_count;
 982     hr = IMFTransform_GetStreamCount(p_sys->mft, &input_streams_count, &output_streams_count);
 983     if (FAILED(hr))
 984         goto error;
 985     if (input_streams_count != 1 || output_streams_count != 1)
 986     {
 987         msg_Err(p_dec, "MFT decoder should have 1 input stream and 1 output stream.");
 988         goto error;
 989     }
 990
 991     hr = IMFTransform_GetStreamIDs(p_sys->mft, 1, &p_sys->input_stream_id, 1, &p_sys->output_stream_id);
 992     if (hr == E_NOTIMPL)
 993     {
 994         /*
 995          * This is not an error, it happens if:
 996          * - there is a fixed number of streams.
 997          * AND
 998          * - streams are numbered consecutively from 0 to N-1.
 999          */
1000         p_sys->input_stream_id = 0;
1001         p_sys->output_stream_id = 0;
1002     }
1003     else if (FAILED(hr))
1004         goto error;
1005
1006     if (SetInputType(p_dec, p_sys->input_stream_id, &p_sys->input_type))
1007         goto error;
1008
1009     if (SetOutputType(p_dec, p_sys->output_stream_id, &p_sys->output_type))
1010         goto error;
1011
1012     /*
1013      * The input type was not set by the previous call to
1014      * SetInputType, try again after setting the output type.
1015      */
1016     if (!p_sys->input_type)
1017         if (SetInputType(p_dec, p_sys->input_stream_id, &p_sys->input_type) || !p_sys->input_type)
1018             goto error;
1019
1020     /* This call can be a no-op for some MFT decoders, but it can potentially reduce starting time. */
1021     hr = IMFTransform_ProcessMessage(p_sys->mft, MFT_MESSAGE_NOTIFY_BEGIN_STREAMING, (ULONG_PTR)0);
1022     if (FAILED(hr))
1023         goto error;
1024
1025     /* This event is required for asynchronous MFTs, optional otherwise. */
1026     hr = IMFTransform_ProcessMessage(p_sys->mft, MFT_MESSAGE_NOTIFY_START_OF_STREAM, (ULONG_PTR)0);
1027     if (FAILED(hr))
1028         goto error;
1029
1030     if (p_dec->fmt_in.i_codec == VLC_CODEC_H264)
1031     {
1032         /* It's not an error if the following call fails. */
1033         IMFAttributes_SetUINT32(attributes, &CODECAPI_AVLowLatencyMode, true);
1034
1035         if (p_dec->fmt_in.i_extra)
1036         {
1037             if (h264_isavcC((uint8_t*)p_dec->fmt_in.p_extra, p_dec->fmt_in.i_extra))
1038             {
1039                 size_t i_buf;
1040                 uint8_t *buf = h264_avcC_to_AnnexB_NAL(p_dec->fmt_in.p_extra,
1041                                                        p_dec->fmt_in.i_extra,
1042                                                       &i_buf, &p_sys->nal_length_size);
1043                 if(buf)
1044                 {
1045                     free(p_dec->fmt_in.p_extra);
1046                     p_dec->fmt_in.p_extra = buf;
1047                     p_dec->fmt_in.i_extra = i_buf;
1048                 }
1049             }
1050         }
1051     }
1052     return VLC_SUCCESS;
1053
1054 error:
1055     msg_Err(p_dec, "Error in InitializeMFT()");
1056     DestroyMFT(p_dec);
1057     return VLC_EGENERIC;
1058 }
1059
1060 static void DestroyMFT(decoder_t *p_dec)
1061 {
1062     decoder_sys_t *p_sys = p_dec->p_sys;
1063
1064     if (p_sys->event_generator)
1065         IMFMediaEventGenerator_Release(p_sys->event_generator);
1066     if (p_sys->input_type)
1067         IMFMediaType_Release(p_sys->input_type);
1068     if (p_sys->output_sample)
1069     {
1070         IMFMediaBuffer *output_media_buffer = NULL;
1071         HRESULT hr = IMFSample_GetBufferByIndex(p_sys->output_sample, 0, &output_media_buffer);
1072         if (SUCCEEDED(hr))
1073             IMFSample_Release(output_media_buffer);
1074         IMFSample_Release(p_sys->output_sample);
1075     }
1076     if (p_sys->output_type)
1077         IMFMediaType_Release(p_sys->output_type);
1078     if (p_sys->mft)
1079         IMFTransform_Release(p_sys->mft);
1080
1081     p_sys->event_generator = NULL;
1082     p_sys->input_type = NULL;
1083     p_sys->output_sample = NULL;
1084     p_sys->output_type = NULL;
1085     p_sys->mft = NULL;
1086 }
1087
1088 static int FindMFT(decoder_t *p_dec)
1089 {
1090     decoder_sys_t *p_sys = p_dec->p_sys;
1091     MFHandle *mf = &p_sys->mf_handle;
1092     HRESULT hr;
1093
1094     /* Try to create a MFT using MFTEnumEx. */
1095     GUID category;
1096     if (p_dec->fmt_in.i_cat == VIDEO_ES)
1097     {
1098         category = MFT_CATEGORY_VIDEO_DECODER;
1099         p_sys->major_type = &MFMediaType_Video;
1100         p_sys->subtype = FormatToGUID(video_format_table, p_dec->fmt_in.i_codec);
1101         if(!p_sys->subtype) {
1102             /* Codec is not well known. Construct a MF transform subtype from the fourcc */
1103             p_sys->custom_subtype = MFVideoFormat_Base;
1104             p_sys->custom_subtype.Data1 = p_dec->fmt_in.i_codec;
1105             p_sys->subtype = &p_sys->custom_subtype;
1106         }
1107     }
1108     else
1109     {
1110         category = MFT_CATEGORY_AUDIO_DECODER;
1111         p_sys->major_type = &MFMediaType_Audio;
1112         p_sys->subtype = FormatToGUID(audio_format_table, p_dec->fmt_in.i_codec);
1113     }
1114     if (!p_sys->subtype)
1115         return VLC_EGENERIC;
1116
1117     UINT32 flags = MFT_ENUM_FLAG_SORTANDFILTER | MFT_ENUM_FLAG_LOCALMFT
1118                  | MFT_ENUM_FLAG_SYNCMFT | MFT_ENUM_FLAG_ASYNCMFT
1119                  | MFT_ENUM_FLAG_HARDWARE | MFT_ENUM_FLAG_TRANSCODE_ONLY;
1120     MFT_REGISTER_TYPE_INFO input_type = { *p_sys->major_type, *p_sys->subtype };
1121     IMFActivate **activate_objects = NULL;
1122     UINT32 activate_objects_count = 0;
1123     hr = mf->fptr_MFTEnumEx(category, flags, &input_type, NULL, &activate_objects, &activate_objects_count);
1124     if (FAILED(hr))
1125         return VLC_EGENERIC;
1126
1127     msg_Dbg(p_dec, "Found %d available MFT module(s)", activate_objects_count);
1128     if (activate_objects_count == 0)
1129         return VLC_EGENERIC;
1130
1131     for (UINT32 i = 0; i < activate_objects_count; ++i)
1132     {
1133         hr = IMFActivate_ActivateObject(activate_objects[i], &IID_IMFTransform, (void**)&p_sys->mft);
1134         IMFActivate_Release(activate_objects[i]);
1135         if (FAILED(hr))
1136             continue;
1137
1138         if (InitializeMFT(p_dec) == VLC_SUCCESS)
1139         {
1140             CoTaskMemFree(activate_objects);
1141             return VLC_SUCCESS;
1142         }
1143     }
1144     CoTaskMemFree(activate_objects);
1145
1146     return VLC_EGENERIC;
1147 }
1148
1149 static int LoadMFTLibrary(MFHandle *mf)
1150 {
1151 #if _WIN32_WINNT < _WIN32_WINNT_WIN7 || VLC_WINSTORE_APP || __MINGW64_VERSION_MAJOR < 6
1152     mf->mfplat_dll = LoadLibrary(TEXT("mfplat.dll"));
1153     if (!mf->mfplat_dll)
1154         return VLC_EGENERIC;
1155
1156     mf->fptr_MFTEnumEx = (void*)GetProcAddress(mf->mfplat_dll, "MFTEnumEx");
1157     mf->fptr_MFCreateSample = (void*)GetProcAddress(mf->mfplat_dll, "MFCreateSample");
1158     mf->fptr_MFCreateMemoryBuffer = (void*)GetProcAddress(mf->mfplat_dll, "MFCreateMemoryBuffer");
1159     mf->fptr_MFCreateAlignedMemoryBuffer = (void*)GetProcAddress(mf->mfplat_dll, "MFCreateAlignedMemoryBuffer");
1160     if (!mf->fptr_MFTEnumEx || !mf->fptr_MFCreateSample || !mf->fptr_MFCreateMemoryBuffer || !mf->fptr_MFCreateAlignedMemoryBuffer)
1161         return VLC_EGENERIC;
1162 #else
1163     mf->fptr_MFTEnumEx = &MFTEnumEx;
1164     mf->fptr_MFCreateSample = &MFCreateSample;
1165     mf->fptr_MFCreateMemoryBuffer = &MFCreateMemoryBuffer;
1166     mf->fptr_MFCreateAlignedMemoryBuffer = &MFCreateAlignedMemoryBuffer;
1167 #endif
1168
1169     return VLC_SUCCESS;
1170 }
1171
1172 static int Open(vlc_object_t *p_this)
1173 {
1174     decoder_t *p_dec = (decoder_t *)p_this;
1175     decoder_sys_t *p_sys;
1176
1177     p_sys = p_dec->p_sys = calloc(1, sizeof(*p_sys));
1178     if (!p_sys)
1179         return VLC_ENOMEM;
1180
1181     if( FAILED(CoInitializeEx(NULL, COINIT_MULTITHREADED)) )
1182     {
1183         free(p_sys);
1184         return VLC_EGENERIC;
1185     }
1186
1187     if (LoadMFTLibrary(&p_sys->mf_handle))
1188     {
1189         msg_Err(p_dec, "Failed to load MFT library.");
1190         goto error;
1191     }
1192
1193     if (FindMFT(p_dec))
1194     {
1195         msg_Err(p_dec, "Could not find suitable MFT decoder");
1196         goto error;
1197     }
1198
1199     /* Only one output sample is needed, we can allocate one and reuse it. */
1200     if (AllocateOutputSample(p_dec, 0, &p_sys->output_sample))
1201         goto error;
1202
1203     p_dec->pf_decode = p_sys->is_async ? DecodeAsync : DecodeSync;
1204
1205     return VLC_SUCCESS;
1206
1207 error:
1208     Close(p_this);
1209     return VLC_EGENERIC;
1210 }
1211
1212 static void Close(vlc_object_t *p_this)
1213 {
1214     decoder_t *p_dec = (decoder_t *)p_this;
1215     decoder_sys_t *p_sys = p_dec->p_sys;
1216     MFHandle *mf = &p_sys->mf_handle;
1217
1218     DestroyMFT(p_dec);
1219
1220     if (mf->mfplat_dll)
1221         FreeLibrary(mf->mfplat_dll);
1222
1223     free(p_sys);
1224
1225     CoUninitialize();
1226 }