コード例 #1
0
        private void devicesCombo_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            var item = (DeviceItem)devicesCombo.SelectedItem;

            if (item != null)
            {
                mediaCombo.Items.Clear();

                using (var releaser = new ComReleaser())
                {
                    MF.CreateVideoDeviceSource(item.SymLink, out IMFMediaSource source);
                    releaser.Add(source);
                    source.CreatePresentationDescriptor(out IMFPresentationDescriptor presDesc);
                    releaser.Add(presDesc);
                    presDesc.GetStreamDescriptorCount(out int descCount);
                    for (int descIndex = 0; descIndex < descCount; descIndex++)
                    {
                        presDesc.GetStreamDescriptorByIndex(descIndex, out bool selected, out IMFStreamDescriptor strmDesc);
                        releaser.Add(strmDesc);
                        strmDesc.GetMediaTypeHandler(out IMFMediaTypeHandler handler);
                        releaser.Add(handler);
                        handler.GetMediaTypeCount(out int typeCount);
                        for (int typeIndex = 0; typeIndex < typeCount; typeIndex++)
                        {
                            handler.GetMediaTypeByIndex(typeIndex, out IMFMediaType type);
                            releaser.Add(type);
                            type.GetSize(MFAttributesClsid.MF_MT_FRAME_SIZE, out uint width, out uint height);
                            type.GetGUID(MFAttributesClsid.MF_MT_SUBTYPE, out Guid subType);
                            type.GetUINT32(MFAttributesClsid.MF_MT_DEFAULT_STRIDE, out uint stride);
                            type.GetUINT32(MFAttributesClsid.MF_MT_SAMPLE_SIZE, out uint sampleSize);

                            mediaCombo.Items.Add(
                                new MediaItem
                            {
                                Name       = $"#{descIndex}.{typeIndex}: {width}x{height}, {GetSubTypeName(subType)}, {((int)stride)}, {sampleSize}",
                                DescIndex  = descIndex,
                                TypeIndex  = typeIndex,
                                Width      = (int)width,
                                Height     = (int)height,
                                Stride     = (int)stride,
                                SampleSize = (int)sampleSize,
                                DeviceItem = item,
                                SubType    = subType,
                            }
                                );
                        }
                    }
                }
            }
        }
コード例 #2
0
        private void CaptureStillImages(MediaItem item)
        {
            using (var releaser = new ComReleaser())
            {
                MF.CreateVideoDeviceSource(item.DeviceItem.SymLink, out IMFMediaSource source);
                releaser.Add(source);
                source.CreatePresentationDescriptor(out IMFPresentationDescriptor presDesc);
                releaser.Add(presDesc);
                presDesc.GetStreamDescriptorByIndex(item.DescIndex, out bool selected, out IMFStreamDescriptor strmDesc);
                releaser.Add(strmDesc);
                strmDesc.GetMediaTypeHandler(out IMFMediaTypeHandler handler);
                releaser.Add(handler);
                handler.GetMediaTypeByIndex(item.TypeIndex, out IMFMediaType type);
                handler.SetCurrentMediaType(type);

                MF.CreateSourceReaderFromMediaSource(source, out IMFSourceReader reader);
                if (reader == null)
                {
                    return;
                }
                releaser.Add(reader);

                IMFTransform          transform      = null;
                MFTOutputDataBuffer[] outSamples     = null;
                IMFSample             outRgb24Sample = null;
                IMFMediaBuffer        outRgb24Buffer = null;

                int rgbSize = item.Width * item.Height * 3;

                var needToConvert = item.SubType != MFMediaType.RGB24;
                if (needToConvert)
                {
                    var processor = new VideoProcessorMFT();
                    releaser.Add(processor);
                    transform = (IMFTransform)processor;
                    HR(transform.SetInputType(0, type, MFTSetTypeFlags.None));
                    var rgbMediaType = MF.CreateMediaType();
                    releaser.Add(rgbMediaType);
                    HR(type.CopyAllItems(rgbMediaType));
                    HR(rgbMediaType.SetGUID(MFAttributesClsid.MF_MT_SUBTYPE, MFMediaType.RGB24));
                    HR(rgbMediaType.SetUINT32(MFAttributesClsid.MF_MT_DEFAULT_STRIDE, 3 * item.Width));
                    HR(rgbMediaType.SetUINT32(MFAttributesClsid.MF_MT_SAMPLE_SIZE, rgbSize));
                    HR(transform.SetOutputType(0, rgbMediaType, MFTSetTypeFlags.None));

                    outSamples     = new MFTOutputDataBuffer[1];
                    outSamples[0]  = new MFTOutputDataBuffer();
                    outRgb24Sample = MF.CreateSample();
                    releaser.Add(outRgb24Sample);
                    outRgb24Buffer = MF.CreateMemoryBuffer(rgbSize);
                    releaser.Add(outRgb24Buffer);
                    outRgb24Sample.AddBuffer(outRgb24Buffer);
                    outSamples[0].pSample = Marshal.GetIUnknownForObject(outRgb24Sample);
                }

                while (true)
                {
                    int frames = 0;
                    var hrRS   = reader.ReadSample(
                        (int)MF_SOURCE_READER.AnyStream,
                        MF_SOURCE_READER_CONTROL_FLAG.None,
                        out int streamIndex,
                        out MF_SOURCE_READER_FLAG flags,
                        out long timeStamp,
                        out IMFSample sample
                        );

                    if (sample != null)
                    {
                        try
                        {
                            IMFSample rgbSample = sample;

                            if (transform != null)
                            {
                                transform.ProcessInput(0, sample, 0);
                                while (true)
                                {
                                    var hrPO = transform.ProcessOutput(
                                        MFTProcessOutputFlags.None,
                                        1,
                                        outSamples,
                                        out ProcessOutputStatus status
                                        );
                                    if (hrPO.Succeeded())
                                    {
                                        ConsumeBuffer(outRgb24Buffer, item);
                                        frames++;
                                        Marshal.ReleaseComObject(sample);
                                        return;
                                        //break;
                                    }
                                    else
                                    {
                                        break;
                                    }
                                }
                                //var hrPI = transform.ProcessInput(0, sample, 0);
                                continue;
                            }

                            rgbSample.GetBufferByIndex(0, out IMFMediaBuffer buff);
                            if (ConsumeBuffer(buff, item))
                            {
                                frames++;
                            }
                            else
                            {
                                return;
                            }
                        }
                        finally
                        {
                            Marshal.ReleaseComObject(sample);
                        }
                        break;
                    }
                }
            }
        }