codec: implementation of Media Foundation Transform audio/video decoding

Media Foundation is a framework for encoding/decoding multimedia
content on Windows Vista and above. A Media Foundation Transform (MFT)
is a module implementing an encoder, a decoder or a filter.

MFTs can be enumerated and initialized using the function MFTEnumEx.
A MFT can be SW or HW, synchronous or asynchronous.

NEWS

@@ -26,6 +26,7 @@ Decoder:
  * Fix channel ordering of LPCM codec in m2ts files
  * New jpeg image decoder
  * Add tx3g subtitles decoder
+ * Add Media Foundation Transform decoder
 
 Encoder:
  * Support for MPEG-2 encoding using x262

modules/MODULES_LIST

@@ -200,6 +200,7 @@ $Id$
  * marq: Overlays a marquee on the video
  * mediacodec: Android Jelly Bean MediaCodec decoder module
  * mediadirs: Picture/Music/Video user directories as service discoveries
+ * mft: Media Foundation Transform audio/video decoder
  * minimal_macosx: a minimal Mac OS X GUI, using the FrameWork
  * mirror: mirror video filter
  * mjpeg: a demuxer for multipart and concatenated JPEG data

modules/codec/Makefile.am

@@ -459,6 +459,12 @@ libdmo_plugin_la_LIBADD += -lole32 -luuid
 codec_LTLIBRARIES += libdmo_plugin.la
 endif
 
+libmft_plugin_la_SOURCES = codec/mft.c
+if HAVE_WIN32
+libmft_plugin_la_LIBADD = -lole32 -luuid
+codec_LTLIBRARIES += libmft_plugin.la
+endif
+
 libquicktime_plugin_la_SOURCES = codec/quicktime.c
 libquicktime_plugin_la_LDFLAGS = $(AM_LDFLAGS) -rpath '$(codecdir)'
 libquicktime_plugin_la_LIBADD = $(LIBM)

modules/codec/mft.c

+/*****************************************************************************
+ * mft.c : Media Foundation Transform audio/video decoder
+ *****************************************************************************
+ * Copyright (C) 2014 VLC authors and VideoLAN
+ *
+ * Author: Felix Abecassis <felix.abecassis@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation; either version 2.1 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
+ *****************************************************************************/
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#undef WINVER
+#define WINVER 0x0601
+
+/* Needed for many mingw macros. */
+#define COBJMACROS
+
+/* Avoid having GUIDs being defined as "extern". */
+#define INITGUID
+
+#ifndef STDCALL
+# define STDCALL __stdcall
+#endif
+
+#include <vlc_common.h>
+#include <vlc_plugin.h>
+#include <vlc_codec.h>
+#include <h264_nal.h>
+#define _VIDEOINFOHEADER_
+#include <vlc_codecs.h>
+
+#include <mfapi.h>
+#include <mftransform.h>
+#include <mferror.h>
+#include <mfobjects.h>
+
+static int  Open(vlc_object_t *);
+static void Close(vlc_object_t *);
+
+vlc_module_begin()
+    set_description(N_("Media Foundation Transform decoder"))
+    add_shortcut("mft")
+    set_capability("decoder", 1)
+    set_callbacks(Open, Close)
+    set_category(CAT_INPUT)
+    set_subcategory(SUBCAT_INPUT_VCODEC)
+vlc_module_end()
+
+typedef struct
+{
+    HINSTANCE mfplat_dll;
+    HRESULT (STDCALL *MFTEnumEx)(GUID guidCategory, UINT32 Flags,
+                                 const MFT_REGISTER_TYPE_INFO *pInputType,
+                                 const MFT_REGISTER_TYPE_INFO *pOutputType,
+                                 IMFActivate ***pppMFTActivate, UINT32 *pcMFTActivate);
+    HRESULT (STDCALL *MFCreateSample)(IMFSample **ppIMFSample);
+    HRESULT (STDCALL *MFCreateMemoryBuffer)(DWORD cbMaxLength, IMFMediaBuffer **ppBuffer);
+    HRESULT (STDCALL *MFCreateAlignedMemoryBuffer)(DWORD cbMaxLength, DWORD fAlignmentFlags, IMFMediaBuffer **ppBuffer);
+} MFHandle;
+
+struct decoder_sys_t
+{
+    MFHandle mf_handle;
+
+    IMFTransform *mft;
+
+    const GUID* major_type;
+    const GUID* subtype;
+
+    /* For asynchronous MFT */
+    bool is_async;
+    IMFMediaEventGenerator *event_generator;
+    int pending_input_events;
+    int pending_output_events;
+
+    /* Input stream */
+    DWORD input_stream_id;
+    IMFMediaType *input_type;
+
+    /* Output stream */
+    DWORD output_stream_id;
+    IMFSample *output_sample;
+    IMFMediaType *output_type;
+
+    /* H264 only. */
+    uint32_t nal_size;
+};
+
+static const int pi_channels_maps[9] =
+{
+    0,
+    AOUT_CHAN_CENTER,
+    AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT,
+    AOUT_CHAN_CENTER | AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT,
+    AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_REARLEFT
+     | AOUT_CHAN_REARRIGHT,
+    AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
+     | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT,
+    AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
+     | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT | AOUT_CHAN_LFE,
+    AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
+     | AOUT_CHAN_REARCENTER | AOUT_CHAN_MIDDLELEFT
+     | AOUT_CHAN_MIDDLERIGHT | AOUT_CHAN_LFE,
+    AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER | AOUT_CHAN_REARLEFT
+     | AOUT_CHAN_REARRIGHT | AOUT_CHAN_MIDDLELEFT | AOUT_CHAN_MIDDLERIGHT
+     | AOUT_CHAN_LFE,
+};
+
+/* Possibly missing from mingw headers */
+#ifndef MF_E_TRANSFORM_NEED_MORE_INPUT
+# define MF_E_TRANSFORM_NEED_MORE_INPUT _HRESULT_TYPEDEF_(0xc00d6d72)
+#endif
+
+#ifndef MF_E_TRANSFORM_STREAM_CHANGE
+# define MF_E_TRANSFORM_STREAM_CHANGE _HRESULT_TYPEDEF_(0xc00d6d61)
+#endif
+
+#ifndef MF_E_NO_EVENTS_AVAILABLE
+# define MF_E_NO_EVENTS_AVAILABLE _HRESULT_TYPEDEF_(0xC00D3E80L)
+#endif
+
+#ifndef MF_EVENT_FLAG_NO_WAIT
+# define MF_EVENT_FLAG_NO_WAIT 0x00000001
+#endif
+
+/*
+ * The MFTransformXXX values might not be defined in mingw headers,
+ * thus we use our own enum with the VLC prefix.
+ */
+enum
+{
+    VLC_METransformUnknown = 600,
+    VLC_METransformNeedInput,
+    VLC_METransformHaveOutput,
+    VLC_METransformDrainComplete,
+    VLC_METransformMarker,
+};
+
+typedef struct
+{
+    vlc_fourcc_t fourcc;
+    const GUID   *guid;
+} pair_format_guid;
+
+/*
+ * We need this table since the FOURCC used for GUID is not the same
+ * as the FOURCC used by VLC, for instance h264 vs H264.
+ */
+static const pair_format_guid video_format_table[] =
+{
+    { VLC_CODEC_H264, &MFVideoFormat_H264 },
+    { VLC_CODEC_MJPG, &MFVideoFormat_MJPG },
+    { VLC_CODEC_WMV1, &MFVideoFormat_WMV1 },
+    { VLC_CODEC_WMV2, &MFVideoFormat_WMV2 },
+    { VLC_CODEC_WMV3, &MFVideoFormat_WMV3 },
+    { VLC_CODEC_VC1,  &MFVideoFormat_WVC1 },
+    { 0, NULL }
+};
+
+DEFINE_GUID(MFAudioFormat_Dolby_AC3, 0xe06d802c, 0xdb46, 0x11cf, 0xb4, 0xd1, 0x00, 0x80, 0x5f, 0x6c, 0xbb, 0xea);
+/*
+ * We cannot use the FOURCC code for audio either since the
+ * WAVE_FORMAT value is used to create the GUID.
+ */
+static const pair_format_guid audio_format_table[] =
+{
+    { VLC_CODEC_MPGA, &MFAudioFormat_MPEG      },
+    { VLC_CODEC_MP3,  &MFAudioFormat_MP3       },
+    { VLC_CODEC_DTS,  &MFAudioFormat_DTS       },
+    { VLC_CODEC_MP4A, &MFAudioFormat_AAC       },
+    { VLC_CODEC_WMA2, &MFAudioFormat_WMAudioV8 },
+    { VLC_CODEC_A52,  &MFAudioFormat_Dolby_AC3 },
+    { 0, NULL }
+};
+
+static const GUID *FormatToGUID(const pair_format_guid table[], vlc_fourcc_t fourcc)
+{
+    for (int i = 0; table[i].fourcc; ++i)
+        if (table[i].fourcc == fourcc)
+            return table[i].guid;
+
+    return NULL;
+}
+
+/*
+ * Low latency mode for Windows 8. Without this option, the H264
+ * decoder will fill *all* its internal buffers before returning a
+ * frame. Because of this behavior, the decoder might return no frame
+ * for more than 500 ms, making it unusable for playback.
+ */
+DEFINE_GUID(CODECAPI_AVLowLatencyMode, 0x9c27891a, 0xed7a, 0x40e1, 0x88, 0xe8, 0xb2, 0x27, 0x27, 0xa0, 0x24, 0xee);
+
+static int SetInputType(decoder_t *p_dec, DWORD stream_id, IMFMediaType **result)
+{
+    decoder_sys_t *p_sys = p_dec->p_sys;
+    HRESULT hr;
+
+    *result = NULL;
+
+    IMFMediaType *input_media_type = NULL;
+
+    /* Search a suitable input type for the MFT. */
+    int input_type_index = 0;
+    bool found = false;
+    for (int i = 0; !found; ++i)
+    {
+        hr = IMFTransform_GetInputAvailableType(p_sys->mft, stream_id, i, &input_media_type);
+        if (hr == MF_E_NO_MORE_TYPES)
+            break;
+        else if (hr == MF_E_TRANSFORM_TYPE_NOT_SET)
+        {
+            /* The output type must be set before setting the input type for this MFT. */
+            return VLC_SUCCESS;
+        }
+        else if (FAILED(hr))
+            goto error;
+
+        GUID subtype;
+        hr = IMFMediaType_GetGUID(input_media_type, &MF_MT_SUBTYPE, &subtype);
+        if (FAILED(hr))
+            goto error;
+
+        if (IsEqualGUID(&subtype, p_sys->subtype))
+            found = true;
+
+        if (found)
+            input_type_index = i;
+
+        IMFMediaType_Release(input_media_type);
+        input_media_type = NULL;
+    }
+    if (!found)
+        goto error;
+
+    hr = IMFTransform_GetInputAvailableType(p_sys->mft, stream_id, input_type_index, &input_media_type);
+    if (FAILED(hr))
+        goto error;
+
+    if (p_dec->fmt_in.i_cat == VIDEO_ES)
+    {
+        UINT64 width = p_dec->fmt_in.video.i_width;
+        UINT64 height = p_dec->fmt_in.video.i_height;
+        UINT64 frame_size = (width << 32) | height;
+        hr = IMFMediaType_SetUINT64(input_media_type, &MF_MT_FRAME_SIZE, frame_size);
+        if (FAILED(hr))
+            goto error;
+    }
+    else
+    {
+        hr = IMFMediaType_SetUINT32(input_media_type, &MF_MT_ORIGINAL_WAVE_FORMAT_TAG, p_sys->subtype->Data1);
+        if (FAILED(hr))
+            goto error;
+        if (p_dec->fmt_in.audio.i_rate)
+        {
+            hr = IMFMediaType_SetUINT32(input_media_type, &MF_MT_AUDIO_SAMPLES_PER_SECOND, p_dec->fmt_in.audio.i_rate);
+            if (FAILED(hr))
+                goto error;
+        }
+        if (p_dec->fmt_in.audio.i_channels)
+        {
+            hr = IMFMediaType_SetUINT32(input_media_type, &MF_MT_AUDIO_NUM_CHANNELS, p_dec->fmt_in.audio.i_channels);
+            if (FAILED(hr))
+                goto error;
+        }
+        if (p_dec->fmt_in.audio.i_bitspersample)
+        {
+            hr = IMFMediaType_SetUINT32(input_media_type, &MF_MT_AUDIO_BITS_PER_SAMPLE, p_dec->fmt_in.audio.i_bitspersample);
+            if (FAILED(hr))
+                goto error;
+        }
+        if (p_dec->fmt_in.audio.i_blockalign)
+        {
+            hr = IMFMediaType_SetUINT32(input_media_type, &MF_MT_AUDIO_BLOCK_ALIGNMENT, p_dec->fmt_in.audio.i_blockalign);
+            if (FAILED(hr))
+                goto error;
+        }
+        if (p_dec->fmt_in.i_bitrate)
+        {
+            hr = IMFMediaType_SetUINT32(input_media_type, &MF_MT_AUDIO_AVG_BYTES_PER_SECOND, p_dec->fmt_in.i_bitrate / 8);
+            if (FAILED(hr))
+                goto error;
+        }
+    }
+
+    if (p_dec->fmt_in.i_extra > 0)
+    {
+        UINT32 blob_size = 0;
+        hr = IMFMediaType_GetBlobSize(input_media_type, &MF_MT_USER_DATA, &blob_size);
+        /*
+         * Do not overwrite existing user data in the input type, this
+         * can cause the MFT to reject the type.
+         */
+        if (hr == MF_E_ATTRIBUTENOTFOUND)
+        {
+            hr = IMFMediaType_SetBlob(input_media_type, &MF_MT_USER_DATA,
+                                      (const UINT8*)p_dec->fmt_in.p_extra, p_dec->fmt_in.i_extra);
+            if (FAILED(hr))
+                goto error;
+        }
+    }
+
+    hr = IMFTransform_SetInputType(p_sys->mft, stream_id, input_media_type, 0);
+    if (FAILED(hr))
+        goto error;
+
+    *result = input_media_type;
+
+    return VLC_SUCCESS;
+
+error:
+    msg_Err(p_dec, "Error in SetInputType()");
+    if (input_media_type)
+        IMFMediaType_Release(input_media_type);
+    return VLC_EGENERIC;
+}
+
+static int SetOutputType(decoder_t *p_dec, DWORD stream_id, IMFMediaType **result)
+{
+    decoder_sys_t *p_sys = p_dec->p_sys;
+    HRESULT hr;
+
+    *result = NULL;
+
+    IMFMediaType *output_media_type = NULL;
+
+    /*
+     * Enumerate available output types. The list is ordered by
+     * preference thus we will use the first one unless YV12/I420 is
+     * available for video or float32 for audio.
+     */
+    int output_type_index = 0;
+    bool found = false;
+    for (int i = 0; !found; ++i)
+    {
+        hr = IMFTransform_GetOutputAvailableType(p_sys->mft, stream_id, i, &output_media_type);
+        if (hr == MF_E_NO_MORE_TYPES)
+            break;
+        else if (hr == MF_E_TRANSFORM_TYPE_NOT_SET)
+        {
+            /* The input type must be set before setting the output type for this MFT. */
+            return VLC_SUCCESS;
+        }
+        else if (FAILED(hr))
+            goto error;
+
+        GUID subtype;
+        hr = IMFMediaType_GetGUID(output_media_type, &MF_MT_SUBTYPE, &subtype);
+        if (FAILED(hr))
+            goto error;
+
+        if (p_dec->fmt_in.i_cat == VIDEO_ES)
+        {
+            if (IsEqualGUID(&subtype, &MFVideoFormat_YV12) || IsEqualGUID(&subtype, &MFVideoFormat_I420))
+                found = true;
+        }
+        else
+        {
+            UINT32 bits_per_sample;
+            hr = IMFMediaType_GetUINT32(output_media_type, &MF_MT_AUDIO_BITS_PER_SAMPLE, &bits_per_sample);
+            if (FAILED(hr))
+                continue;
+            if (bits_per_sample == 32 && IsEqualGUID(&subtype, &MFAudioFormat_Float))
+                found = true;
+        }
+
+        if (found)
+            output_type_index = i;
+
+        IMFMediaType_Release(output_media_type);
+        output_media_type = NULL;
+    }
+    /*
+     * It's not an error if we don't find the output type we were
+     * looking for, in this case we use the first available type which
+     * is the "preferred" output type for this MFT.
+     */
+
+    hr = IMFTransform_GetOutputAvailableType(p_sys->mft, stream_id, output_type_index, &output_media_type);
+    if (FAILED(hr))
+        goto error;
+
+    hr = IMFTransform_SetOutputType(p_sys->mft, stream_id, output_media_type, 0);
+    if (FAILED(hr))
+        goto error;
+
+    GUID subtype;
+    hr = IMFMediaType_GetGUID(output_media_type, &MF_MT_SUBTYPE, &subtype);
+    if (FAILED(hr))
+        goto error;
+
+    if (p_dec->fmt_in.i_cat == VIDEO_ES)
+    {
+        p_dec->fmt_out.video = p_dec->fmt_in.video;
+        p_dec->fmt_out.i_codec = vlc_fourcc_GetCodec(p_dec->fmt_in.i_cat, subtype.Data1);
+    }
+    else
+    {
+        p_dec->fmt_out.audio = p_dec->fmt_in.audio;
+
+        UINT32 bitspersample = 0;
+        hr = IMFMediaType_GetUINT32(output_media_type, &MF_MT_AUDIO_BITS_PER_SAMPLE, &bitspersample);
+        if (SUCCEEDED(hr) && bitspersample)
+            p_dec->fmt_out.audio.i_bitspersample = bitspersample;
+
+        UINT32 channels = 0;
+        hr = IMFMediaType_GetUINT32(output_media_type, &MF_MT_AUDIO_NUM_CHANNELS, &channels);
+        if (SUCCEEDED(hr) && channels)
+            p_dec->fmt_out.audio.i_channels = channels;
+
+        UINT32 rate = 0;
+        hr = IMFMediaType_GetUINT32(output_media_type, &MF_MT_AUDIO_SAMPLES_PER_SECOND, &rate);
+        if (SUCCEEDED(hr) && rate)
+            p_dec->fmt_out.audio.i_rate = rate;
+
+        vlc_fourcc_t fourcc;
+        wf_tag_to_fourcc(subtype.Data1, &fourcc, NULL);
+        p_dec->fmt_out.i_codec = vlc_fourcc_GetCodecAudio(fourcc, p_dec->fmt_out.audio.i_bitspersample);
+
+        p_dec->fmt_out.audio.i_physical_channels = pi_channels_maps[p_dec->fmt_out.audio.i_channels];
+        p_dec->fmt_out.audio.i_original_channels = p_dec->fmt_out.audio.i_physical_channels;
+    }
+
+    *result = output_media_type;
+
+    return VLC_SUCCESS;
+
+error:
+    msg_Err(p_dec, "Error in SetOutputType()");
+    if (output_media_type)
+        IMFMediaType_Release(output_media_type);
+    return VLC_EGENERIC;
+}
+
+static int AllocateInputSample(decoder_t *p_dec, DWORD stream_id, IMFSample** result, DWORD size)
+{
+    decoder_sys_t *p_sys = p_dec->p_sys;
+    MFHandle *mf = &p_sys->mf_handle;
+    HRESULT hr;
+
+    *result = NULL;
+
+    IMFSample *input_sample = NULL;
+
+    MFT_INPUT_STREAM_INFO input_info;
+    hr = IMFTransform_GetInputStreamInfo(p_sys->mft, stream_id, &input_info);
+    if (FAILED(hr))
+        goto error;
+
+    hr = mf->MFCreateSample(&input_sample);
+    if (FAILED(hr))
+        goto error;
+
+    IMFMediaBuffer *input_media_buffer = NULL;
+    DWORD allocation_size = __MAX(input_info.cbSize, size);
+    hr = mf->MFCreateMemoryBuffer(allocation_size, &input_media_buffer);
+    if (FAILED(hr))
+        goto error;
+
+    hr = IMFSample_AddBuffer(input_sample, input_media_buffer);
+    IMFMediaBuffer_Release(input_media_buffer);
+    if (FAILED(hr))
+        goto error;
+
+    *result = input_sample;
+
+    return VLC_SUCCESS;
+
+error:
+    msg_Err(p_dec, "Error in AllocateInputSample()");
+    if (input_sample)
+        IMFSample_Release(input_sample);
+    if (input_media_buffer)
+        IMFMediaBuffer_Release(input_media_buffer);
+    return VLC_EGENERIC;
+}
+
+static int AllocateOutputSample(decoder_t *p_dec, DWORD stream_id, IMFSample **result)
+{
+    decoder_sys_t *p_sys = p_dec->p_sys;
+    MFHandle *mf = &p_sys->mf_handle;
+    HRESULT hr;
+
+    *result = NULL;
+
+    IMFSample *output_sample = NULL;
+
+    MFT_OUTPUT_STREAM_INFO output_info;
+    hr = IMFTransform_GetOutputStreamInfo(p_sys->mft, stream_id, &output_info);
+    if (FAILED(hr))
+        goto error;
+
+    if (output_info.dwFlags & (MFT_OUTPUT_STREAM_PROVIDES_SAMPLES | MFT_OUTPUT_STREAM_CAN_PROVIDE_SAMPLES))
+    {
+        /* The MFT will provide an allocated sample. */
+        return VLC_SUCCESS;
+    }
+
+    DWORD expected_flags = 0;
+    if (p_dec->fmt_in.i_cat == VIDEO_ES)
+        expected_flags |= MFT_OUTPUT_STREAM_WHOLE_SAMPLES
+                        | MFT_OUTPUT_STREAM_SINGLE_SAMPLE_PER_BUFFER
+                        | MFT_OUTPUT_STREAM_FIXED_SAMPLE_SIZE;
+    if ((output_info.dwFlags & expected_flags) != expected_flags)
+        goto error;
+
+    hr = mf->MFCreateSample(&output_sample);
+    if (FAILED(hr))
+        goto error;
+
+    IMFMediaBuffer *output_media_buffer = NULL;
+    DWORD allocation_size = output_info.cbSize;
+    DWORD alignment = output_info.cbAlignment;
+    if (alignment > 0)
+        hr = mf->MFCreateAlignedMemoryBuffer(allocation_size, alignment - 1, &output_media_buffer);
+    else
+        hr = mf->MFCreateMemoryBuffer(allocation_size, &output_media_buffer);
+    if (FAILED(hr))
+        goto error;
+
+    hr = IMFSample_AddBuffer(output_sample, output_media_buffer);
+    if (FAILED(hr))
+        goto error;
+
+    *result = output_sample;
+
+    return VLC_SUCCESS;
+
+error:
+    msg_Err(p_dec, "Error in AllocateOutputSample()");
+    if (output_sample)
+        IMFSample_Release(output_sample);
+    return VLC_EGENERIC;
+}
+
+static int ProcessInputStream(decoder_t *p_dec, DWORD stream_id, block_t *p_block)
+{
+    decoder_sys_t *p_sys = p_dec->p_sys;
+    HRESULT hr;
+    IMFSample *input_sample = NULL;
+
+    if (AllocateInputSample(p_dec, stream_id, &input_sample, p_block->i_buffer))
+        goto error;
+
+    IMFMediaBuffer *input_media_buffer = NULL;
+    hr = IMFSample_GetBufferByIndex(input_sample, stream_id, &input_media_buffer);
+    if (FAILED(hr))
+        goto error;
+
+    BYTE *buffer_start;
+    hr = IMFMediaBuffer_Lock(input_media_buffer, &buffer_start, NULL, NULL);
+    if (FAILED(hr))
+        goto error;
+
+    memcpy(buffer_start, p_block->p_buffer, p_block->i_buffer);
+
+    if (p_dec->fmt_in.i_codec == VLC_CODEC_H264)
+    {
+        /* in-place NAL to annex B conversion. */
+        struct H264ConvertState convert_state = { 0, 0 };
+        convert_h264_to_annexb(buffer_start, p_block->i_buffer, p_sys->nal_size, &convert_state);
+    }
+
+    hr = IMFMediaBuffer_Unlock(input_media_buffer);
+    if (FAILED(hr))
+        goto error;
+
+    hr = IMFMediaBuffer_SetCurrentLength(input_media_buffer, p_block->i_buffer);
+    if (FAILED(hr))
+        goto error;
+
+    LONGLONG ts = p_block->i_pts;
+    if (!ts && p_block->i_dts)
+        ts = p_block->i_dts;
+
+    /* Convert from microseconds to 100 nanoseconds unit. */
+    hr = IMFSample_SetSampleTime(input_sample, ts * 10);
+    if (FAILED(hr))
+        goto error;
+
+    hr = IMFTransform_ProcessInput(p_sys->mft, stream_id, input_sample, 0);
+    if (FAILED(hr))
+        goto error;
+
+    IMFMediaBuffer_Release(input_media_buffer);
+    IMFSample_Release(input_sample);
+
+    return VLC_SUCCESS;
+
+error:
+    msg_Err(p_dec, "Error in ProcessInputStream()");
+    if (input_sample)
+        IMFSample_Release(input_sample);
+    return VLC_EGENERIC;
+}
+
+/* Copy a packed buffer (no padding) to a picture_t */
+static void CopyPackedBufferToPicture(picture_t *p_pic, const uint8_t *p_src)
+{
+    for (int i = 0; i < p_pic->i_planes; ++i)
+    {
+        uint8_t *p_dst = p_pic->p[i].p_pixels;
+
+        if (p_pic->p[i].i_visible_pitch == p_pic->p[i].i_pitch)
+        {
+            /* Plane is packed, only one memcpy is needed. */
+            uint32_t plane_size = p_pic->p[i].i_pitch * p_pic->p[i].i_visible_lines;
+            memcpy(p_dst, p_src, plane_size);
+            p_src += plane_size;
+            continue;
+        }
+
+        for (int i_line = 0; i_line < p_pic->p[i].i_visible_lines; i_line++)
+        {
+            memcpy(p_dst, p_src, p_pic->p[i].i_visible_pitch);
+            p_src += p_pic->p[i].i_visible_pitch;
+            p_dst += p_pic->p[i].i_pitch;
+        }
+    }
+}
+
+static int ProcessOutputStream(decoder_t *p_dec, DWORD stream_id, void **result)
+{
+    decoder_sys_t *p_sys = p_dec->p_sys;
+    HRESULT hr;
+    picture_t *picture = NULL;
+    block_t *aout_buffer = NULL;
+
+    *result = NULL;
+
+    DWORD output_status = 0;
+    MFT_OUTPUT_DATA_BUFFER output_buffer = { stream_id, p_sys->output_sample, 0, NULL };
+    hr = IMFTransform_ProcessOutput(p_sys->mft, 0, 1, &output_buffer, &output_status);
+    if (output_buffer.pEvents)
+        IMFCollection_Release(output_buffer.pEvents);
+    /* Use the returned sample since it can be provided by the MFT. */
+    IMFSample *output_sample = output_buffer.pSample;
+
+    if (hr == S_OK)
+    {
+        if (!output_sample)
+            return VLC_SUCCESS;
+
+        LONGLONG sample_time;
+        hr = IMFSample_GetSampleTime(output_sample, &sample_time);
+        if (FAILED(hr))
+            goto error;
+        /* Convert from 100 nanoseconds unit to microseconds. */
+        sample_time /= 10;
+
+        DWORD total_length = 0;
+        hr = IMFSample_GetTotalLength(output_sample, &total_length);
+        if (FAILED(hr))
+            goto error;
+
+        if (p_dec->fmt_in.i_cat == VIDEO_ES)
+        {
+            picture = decoder_NewPicture(p_dec);
+            if (!picture)
+                return VLC_SUCCESS;
+
+            UINT32 interlaced = false;
+            hr = IMFSample_GetUINT32(output_sample, &MFSampleExtension_Interlaced, &interlaced);
+            picture->b_progressive = !interlaced;
+
+            picture->date = sample_time;
+        }
+        else
+        {
+            if (p_dec->fmt_out.audio.i_bitspersample == 0 || p_dec->fmt_out.audio.i_channels == 0)
+                goto error;
+            int samples = total_length / (p_dec->fmt_out.audio.i_bitspersample * p_dec->fmt_out.audio.i_channels / 8);
+            aout_buffer = decoder_NewAudioBuffer(p_dec, samples);
+            if (!aout_buffer)
+                return VLC_SUCCESS;
+            if (aout_buffer->i_buffer < total_length)
+                goto error;
+
+            aout_buffer->i_pts = sample_time;
+        }
+
+        IMFMediaBuffer *output_media_buffer = NULL;
+        hr = IMFSample_GetBufferByIndex(output_sample, 0, &output_media_buffer);
+
+        BYTE *buffer_start;
+        hr = IMFMediaBuffer_Lock(output_media_buffer, &buffer_start, NULL, NULL);
+        if (FAILED(hr))
+            goto error;
+
+        if (p_dec->fmt_in.i_cat == VIDEO_ES)
+            CopyPackedBufferToPicture(picture, buffer_start);
+        else
+            memcpy(aout_buffer->p_buffer, buffer_start, total_length);
+
+        hr = IMFMediaBuffer_Unlock(output_media_buffer);
+        IMFSample_Release(output_media_buffer);
+        if (FAILED(hr))
+            goto error;
+
+        if (p_sys->output_sample)
+        {
+            /* Sample is not provided by the MFT: clear its content. */
+            hr = IMFMediaBuffer_SetCurrentLength(output_media_buffer, 0);
+            if (FAILED(hr))
+                goto error;
+        }
+        else
+        {
+            /* Sample is provided by the MFT: decrease refcount. */
+            IMFSample_Release(output_sample);
+        }
+    }
+    else if (hr == MF_E_TRANSFORM_STREAM_CHANGE || hr == MF_E_TRANSFORM_TYPE_NOT_SET)
+    {
+        if (p_sys->output_type)
+            IMFMediaType_Release(p_sys->output_type);
+        if (SetOutputType(p_dec, p_sys->output_stream_id, &p_sys->output_type))
+            goto error;
+
+        /* Reallocate output sample. */
+        if (p_sys->output_sample)
+            IMFSample_Release(p_sys->output_sample);
+        p_sys->output_sample = NULL;
+        if (AllocateOutputSample(p_dec, 0, &p_sys->output_sample))
+            goto error;
+        return VLC_SUCCESS;
+    }
+    else if (hr == MF_E_TRANSFORM_NEED_MORE_INPUT)
+    {
+        return VLC_SUCCESS;
+    }
+    else /* An error not listed above occurred */
+    {
+        msg_Err(p_dec, "Unexpected error in IMFTransform::ProcessOutput: %#x", hr);
+        goto error;
+    }
+
+    if (p_dec->fmt_in.i_cat == VIDEO_ES)
+        *result = picture;
+    else
+        *result = aout_buffer;
+
+    return VLC_SUCCESS;
+
+error:
+    msg_Err(p_dec, "Error in ProcessOutputStream()");
+    if (picture)
+        picture_Release(picture);
+    if (aout_buffer)
+        block_Release(aout_buffer);
+    return VLC_EGENERIC;
+}
+
+static void *DecodeSync(decoder_t *p_dec, block_t **pp_block)
+{
+    decoder_sys_t *p_sys = p_dec->p_sys;
+
+    if (!pp_block || !*pp_block)
+        return NULL;
+
+    block_t *p_block = *pp_block;
+    if (p_block->i_flags & (BLOCK_FLAG_DISCONTINUITY | BLOCK_FLAG_CORRUPTED))
+    {
+        block_Release(p_block);
+        return NULL;
+    }
+
+    /* Drain the output stream before sending the input packet. */
+    void *result = NULL;
+    if (ProcessOutputStream(p_dec, p_sys->output_stream_id, &result))
+        goto error;
+    if (result)
+        return result;
+
+    if (ProcessInputStream(p_dec, p_sys->input_stream_id, p_block))
+        goto error;
+
+    block_Release(p_block);
+    *pp_block = NULL;
+
+    return NULL;
+
+error:
+    msg_Err(p_dec, "Error in DecodeSync()");
+    if (p_block)
+        block_Release(p_block);
+    return NULL;
+}
+
+static HRESULT DequeueMediaEvent(decoder_t *p_dec)
+{
+    decoder_sys_t *p_sys = p_dec->p_sys;
+    HRESULT hr;
+
+    IMFMediaEvent *event = NULL;
+    hr = IMFMediaEventGenerator_GetEvent(p_sys->event_generator, MF_EVENT_FLAG_NO_WAIT, &event);
+    if (FAILED(hr))
+        return hr;
+    MediaEventType event_type;
+    hr = IMFMediaEvent_GetType(event, &event_type);
+    IMFMediaEvent_Release(event);
+    if (FAILED(hr))
+        return hr;
+
+    if (event_type == VLC_METransformNeedInput)
+        p_sys->pending_input_events += 1;
+    else if (event_type == VLC_METransformHaveOutput)
+        p_sys->pending_output_events += 1;
+    else
+        msg_Err(p_dec, "Unsupported asynchronous event.");
+
+    return S_OK;
+}
+
+static void *DecodeAsync(decoder_t *p_dec, block_t **pp_block)
+{
+    decoder_sys_t *p_sys = p_dec->p_sys;
+    HRESULT hr;
+
+    if (!pp_block || !*pp_block)
+        return NULL;
+
+    block_t *p_block = *pp_block;
+    if (p_block->i_flags & (BLOCK_FLAG_DISCONTINUITY | BLOCK_FLAG_CORRUPTED))
+    {
+        block_Release(p_block);
+
+        return NULL;
+    }
+
+    /* Dequeue all pending media events. */
+    while ((hr = DequeueMediaEvent(p_dec)) == S_OK)
+        continue;
+    if (hr != MF_E_NO_EVENTS_AVAILABLE && FAILED(hr))
+        goto error;
+
+    /* Drain the output stream of the MFT before sending the input packet. */
+    if (p_sys->pending_output_events > 0)
+    {
+        p_sys->pending_output_events -= 1;
+        void *result = NULL;
+        if (ProcessOutputStream(p_dec, p_sys->output_stream_id, &result))
+            goto error;
+        return result;
+    }
+
+    /* Poll the MFT and return decoded frames until the input stream is ready. */
+    while (p_sys->pending_input_events == 0)
+    {
+        hr = DequeueMediaEvent(p_dec);
+        if (hr == MF_E_NO_EVENTS_AVAILABLE)
+        {
+            /* Sleep for 1 ms to avoid excessive polling. */
+            Sleep(1);
+            continue;
+        }
+        if (FAILED(hr))
+            goto error;
+
+        if (p_sys->pending_output_events > 0)
+        {
+            p_sys->pending_output_events -= 1;
+            void *result = NULL;
+            if (ProcessOutputStream(p_dec, p_sys->output_stream_id, &result))
+                goto error;
+            return result;
+        }
+    }
+
+    p_sys->pending_input_events -= 1;
+    if (ProcessInputStream(p_dec, p_sys->input_stream_id, p_block))
+        goto error;
+
+    block_Release(p_block);
+    *pp_block = NULL;
+
+    return NULL;
+
+error:
+    msg_Err(p_dec, "Error in DecodeAsync()");
+    block_Release(p_block);
+    return NULL;
+}
+
+static void DestroyMFT(decoder_t *p_dec);
+
+static int InitializeMFT(decoder_t *p_dec)
+{
+    decoder_sys_t *p_sys = p_dec->p_sys;
+    HRESULT hr;
+
+    IMFAttributes *attributes = NULL;
+    hr = IMFTransform_GetAttributes(p_sys->mft, &attributes);
+    if (hr != E_NOTIMPL && FAILED(hr))
+        goto error;
+    if (SUCCEEDED(hr))
+    {
+        UINT32 is_async = false;
+        hr = IMFAttributes_GetUINT32(attributes, &MF_TRANSFORM_ASYNC, &is_async);
+        if (hr != MF_E_ATTRIBUTENOTFOUND && FAILED(hr))
+            goto error;
+        p_sys->is_async = is_async;
+        if (p_sys->is_async)
+        {
+            hr = IMFAttributes_SetUINT32(attributes, &MF_TRANSFORM_ASYNC_UNLOCK, true);
+            if (FAILED(hr))
+                goto error;
+            hr = IMFTransform_QueryInterface(p_sys->mft, &IID_IMFMediaEventGenerator, (void**)&p_sys->event_generator);
+            if (FAILED(hr))
+                goto error;
+        }
+    }
+
+    DWORD input_streams_count;
+    DWORD output_streams_count;
+    hr = IMFTransform_GetStreamCount(p_sys->mft, &input_streams_count, &output_streams_count);
+    if (FAILED(hr))
+        goto error;
+    if (input_streams_count != 1 || output_streams_count != 1)
+    {
+        msg_Err(p_dec, "MFT decoder should have 1 input stream and 1 output stream.");
+        goto error;
+    }
+
+    hr = IMFTransform_GetStreamIDs(p_sys->mft, 1, &p_sys->input_stream_id, 1, &p_sys->output_stream_id);
+    if (hr == E_NOTIMPL)
+    {
+        /*
+         * This is not an error, it happens if:
+         * - there is a fixed number of streams.
+         * AND
+         * - streams are numbered consecutively from 0 to N-1.
+         */
+        p_sys->input_stream_id = 0;
+        p_sys->output_stream_id = 0;
+    }
+    else if (FAILED(hr))
+        goto error;
+
+    if (SetInputType(p_dec, p_sys->input_stream_id, &p_sys->input_type))
+        goto error;
+
+    if (SetOutputType(p_dec, p_sys->output_stream_id, &p_sys->output_type))
+        goto error;
+
+    /*
+     * The input type was not set by the previous call to
+     * SetInputType, try again after setting the output type.
+     */
+    if (!p_sys->input_type)
+        if (SetInputType(p_dec, p_sys->input_stream_id, &p_sys->input_type) || !p_sys->input_type)
+            goto error;
+
+    /* This call can be a no-op for some MFT decoders, but it can potentially reduce starting time. */
+    hr = IMFTransform_ProcessMessage(p_sys->mft, MFT_MESSAGE_NOTIFY_BEGIN_STREAMING, (ULONG_PTR)0);
+    if (FAILED(hr))
+        goto error;
+
+    /* This event is required for asynchronous MFTs, optional otherwise. */
+    hr = IMFTransform_ProcessMessage(p_sys->mft, MFT_MESSAGE_NOTIFY_START_OF_STREAM, (ULONG_PTR)0);
+    if (FAILED(hr))
+        goto error;
+
+    if (p_dec->fmt_in.i_codec == VLC_CODEC_H264)
+    {
+        /* It's not an error if the following call fails. */
+        IMFAttributes_SetUINT32(attributes, &CODECAPI_AVLowLatencyMode, true);
+
+        if (p_dec->fmt_in.i_extra)
+        {
+            int buf_size = p_dec->fmt_in.i_extra + 20;
+            uint32_t size = p_dec->fmt_in.i_extra;
+            uint8_t *buf = malloc(buf_size);
+            if (((uint8_t*)p_dec->fmt_in.p_extra)[0] == 1)
+            {
+                convert_sps_pps(p_dec, p_dec->fmt_in.p_extra, p_dec->fmt_in.i_extra,
+                                buf, buf_size,
+                                &size, &p_sys->nal_size);
+            }
+            free(buf);
+        }
+    }
+    return VLC_SUCCESS;
+
+error:
+    msg_Err(p_dec, "Error in InitializeMFT()");
+    DestroyMFT(p_dec);
+    return VLC_EGENERIC;
+}
+
+static void DestroyMFT(decoder_t *p_dec)
+{
+    decoder_sys_t *p_sys = p_dec->p_sys;
+
+    if (p_sys->event_generator)
+        IMFMediaEventGenerator_Release(p_sys->event_generator);
+    if (p_sys->input_type)
+        IMFMediaType_Release(p_sys->input_type);
+    if (p_sys->output_sample)
+    {
+        IMFMediaBuffer *output_media_buffer = NULL;
+        HRESULT hr = IMFSample_GetBufferByIndex(p_sys->output_sample, 0, &output_media_buffer);
+        if (SUCCEEDED(hr))
+            IMFSample_Release(output_media_buffer);
+        IMFSample_Release(p_sys->output_sample);
+    }
+    if (p_sys->output_type)
+        IMFMediaType_Release(p_sys->output_type);
+    if (p_sys->mft)
+        IMFTransform_Release(p_sys->mft);
+
+    p_sys->event_generator = NULL;
+    p_sys->input_type = NULL;
+    p_sys->output_sample = NULL;
+    p_sys->output_type = NULL;
+    p_sys->mft = NULL;
+}
+
+static int FindMFT(decoder_t *p_dec)
+{
+    decoder_sys_t *p_sys = p_dec->p_sys;
+    MFHandle *mf = &p_sys->mf_handle;
+    HRESULT hr;
+
+    /* Try to create a MFT using MFTEnumEx. */
+    GUID category;
+    if (p_dec->fmt_in.i_cat == VIDEO_ES)
+    {
+        category = MFT_CATEGORY_VIDEO_DECODER;
+        p_sys->major_type = &MFMediaType_Video;
+        p_sys->subtype = FormatToGUID(video_format_table, p_dec->fmt_in.i_codec);
+    }
+    else
+    {
+        category = MFT_CATEGORY_AUDIO_DECODER;
+        p_sys->major_type = &MFMediaType_Audio;
+        p_sys->subtype = FormatToGUID(audio_format_table, p_dec->fmt_in.i_codec);
+    }
+    if (!p_sys->subtype)
+        return VLC_EGENERIC;
+
+    UINT32 flags = MFT_ENUM_FLAG_SORTANDFILTER | MFT_ENUM_FLAG_LOCALMFT
+                 | MFT_ENUM_FLAG_SYNCMFT | MFT_ENUM_FLAG_ASYNCMFT
+                 | MFT_ENUM_FLAG_HARDWARE | MFT_ENUM_FLAG_TRANSCODE_ONLY;
+    MFT_REGISTER_TYPE_INFO input_type = { *p_sys->major_type, *p_sys->subtype };
+    IMFActivate **activate_objects = NULL;
+    UINT32 activate_objects_count = 0;
+    hr = mf->MFTEnumEx(category, flags, &input_type, NULL, &activate_objects, &activate_objects_count);
+    if (FAILED(hr))
+        return VLC_EGENERIC;
+
+    msg_Dbg(p_dec, "Found %d available MFT module(s)", activate_objects_count);
+    if (activate_objects_count == 0)
+        return VLC_EGENERIC;
+
+    for (UINT32 i = 0; i < activate_objects_count; ++i)
+    {
+        hr = IMFActivate_ActivateObject(activate_objects[i], &IID_IMFTransform, (void**)&p_sys->mft);
+        IMFActivate_Release(activate_objects[i]);
+        if (FAILED(hr))
+            continue;
+
+        if (InitializeMFT(p_dec) == VLC_SUCCESS)
+        {
+            CoTaskMemFree(activate_objects);
+            return VLC_SUCCESS;
+        }
+    }
+    CoTaskMemFree(activate_objects);
+
+    return VLC_EGENERIC;
+}
+
+static int LoadMFTLibrary(MFHandle *mf)
+{
+    mf->mfplat_dll = LoadLibrary(TEXT("mfplat.dll"));
+    if (!mf->mfplat_dll)
+        return VLC_EGENERIC;
+
+    mf->MFTEnumEx = (void*)GetProcAddress(mf->mfplat_dll, "MFTEnumEx");
+    mf->MFCreateSample = (void*)GetProcAddress(mf->mfplat_dll, "MFCreateSample");
+    mf->MFCreateMemoryBuffer = (void*)GetProcAddress(mf->mfplat_dll, "MFCreateMemoryBuffer");
+    mf->MFCreateAlignedMemoryBuffer = (void*)GetProcAddress(mf->mfplat_dll, "MFCreateAlignedMemoryBuffer");
+    if (!mf->MFTEnumEx || !mf->MFCreateSample || !mf->MFCreateMemoryBuffer || !mf->MFCreateAlignedMemoryBuffer)
+        return VLC_EGENERIC;
+
+    return VLC_SUCCESS;
+}
+
+int Open(vlc_object_t *p_this)
+{
+    decoder_t *p_dec = (decoder_t *)p_this;
+    decoder_sys_t *p_sys;
+
+    if (p_dec->fmt_in.i_cat != VIDEO_ES && p_dec->fmt_in.i_cat != AUDIO_ES)
+        return VLC_EGENERIC;
+
+    p_sys = p_dec->p_sys = calloc(1, sizeof(*p_sys));
+    if (!p_sys)
+        return VLC_ENOMEM;
+
+    CoInitializeEx(NULL, COINIT_MULTITHREADED);
+
+    if (LoadMFTLibrary(&p_sys->mf_handle))
+    {
+        msg_Err(p_dec, "Failed to load MFT library.");
+        goto error;
+    }
+
+    if (FindMFT(p_dec))
+    {
+        msg_Err(p_dec, "Could not find suitable MFT decoder");
+        goto error;
+    }
+
+    /* Only one output sample is needed, we can allocate one and reuse it. */
+    if (AllocateOutputSample(p_dec, 0, &p_sys->output_sample))
+        goto error;
+
+    if (p_sys->is_async)
+    {
+        p_dec->pf_decode_video = (picture_t *(*)(decoder_t *, block_t **))DecodeAsync;
+        p_dec->pf_decode_audio = (block_t   *(*)(decoder_t *, block_t **))DecodeAsync;
+    }
+    else
+    {
+        p_dec->pf_decode_video = (picture_t *(*)(decoder_t *, block_t **))DecodeSync;
+        p_dec->pf_decode_audio = (block_t   *(*)(decoder_t *, block_t **))DecodeSync;
+    }
+
+    p_dec->fmt_out.i_cat = p_dec->fmt_in.i_cat;
+    p_dec->b_need_packetized = true;
+
+    return VLC_SUCCESS;
+
+error:
+    Close(p_this);
+    return VLC_EGENERIC;
+}
+
+void Close(vlc_object_t *p_this)
+{
+    decoder_t *p_dec = (decoder_t *)p_this;
+    decoder_sys_t *p_sys = p_dec->p_sys;
+    MFHandle *mf = &p_sys->mf_handle;
+
+    DestroyMFT(p_dec);
+
+    if (mf->mfplat_dll)
+        FreeLibrary(mf->mfplat_dll);
+
+    free(p_sys);
+
+    CoUninitialize();
+}

po/POTFILES.in

@@ -377,6 +377,7 @@ modules/codec/kate.c
 modules/codec/libass.c
 modules/codec/libmpeg2.c
 modules/codec/lpcm.c
+modules/codec/mft.c
 modules/codec/mpeg_audio.c
 modules/codec/omxil/android_mediacodec.c
 modules/codec/omxil/omxil.c