FFMPEG plugin: Refactor video decoding function.
- We factor out the code that does the decoding, deinterlacing and color space converting into its own function. This prepares auto detection of video frame properties in a later commit. Auto detection means (for example), that you don't need to know the size of the decoded video frame -before- intitializing the video codec as it is the case with the current implementation. - Use the already existent private member variable fHeader to fill out and return video frame properties. - Rename some variables to be more self describing. - No functional change intended. Signed-off-by: Colin Günther <coling@gmx.de> (cherry picked from commit 6beab04f48e98022041895750f38c5a35a5f4f9e)
This commit is contained in:
Colin Günther
parent
29da3b5548
commit
172c55faf1
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@ -80,8 +80,10 @@ AVCodecDecoder::AVCodecDecoder()
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fIsAudio(false),
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fCodec(NULL),
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fContext(avcodec_alloc_context3(NULL)),
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fInputPicture(avcodec_alloc_frame()),
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fOutputPicture(avcodec_alloc_frame()),
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fDecodedData(NULL),
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fDecodedDataSizeInBytes(0),
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fPostProcessedDecodedPicture(avcodec_alloc_frame()),
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fRawDecodedPicture(avcodec_alloc_frame()),
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fCodecInitDone(false),
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@ -135,8 +137,10 @@ AVCodecDecoder::~AVCodecDecoder()
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if (fCodecInitDone)
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avcodec_close(fContext);
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av_free(fOutputPicture);
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av_free(fInputPicture);
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free(fDecodedData);
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av_free(fPostProcessedDecodedPicture);
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av_free(fRawDecodedPicture);
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av_free(fContext);
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av_free(fOutputFrame);
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@ -256,6 +260,7 @@ AVCodecDecoder::SeekedTo(int64 frame, bigtime_t time)
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fChunkBufferSize = 0;
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fOutputBufferOffset = 0;
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fOutputBufferSize = 0;
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fDecodedDataSizeInBytes = 0;
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fFrame = frame;
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fStartTime = time;
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@ -635,6 +640,43 @@ AVCodecDecoder::_DecodeAudio(void* _buffer, int64* outFrameCount,
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status_t
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AVCodecDecoder::_DecodeVideo(void* outBuffer, int64* outFrameCount,
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media_header* mediaHeader, media_decode_info* info)
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{
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status_t videoDecodingStatus
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= fDecodedDataSizeInBytes > 0 ? B_OK : _DecodeNextVideoFrame();
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if (videoDecodingStatus != B_OK)
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return videoDecodingStatus;
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*outFrameCount = 1;
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*mediaHeader = fHeader;
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memcpy(outBuffer, fDecodedData, fDecodedDataSizeInBytes);
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fDecodedDataSizeInBytes = 0;
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return B_OK;
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}
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/*! Decode next video frame
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We decode exactly one video frame into fDecodedData. To achieve this goal,
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we might need to request several chunks of encoded data resulting in a
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variable execution time of this function.
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The length of the decoded video frame is stored in
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fDecodedDataSizeInBytes. If this variable is greater than zero, you can
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assert that there is a valid video frame available in fDecodedData.
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The decoded video frame in fDecodedData has color space conversion and
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deinterlacing already applied.
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To every decoded video frame there is a media_header populated in
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fHeader, containing the corresponding video frame properties.
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@return B_OK, when we successfully decoded one video frame
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*/
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status_t
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AVCodecDecoder::_DecodeNextVideoFrame()
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{
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bool firstRun = true;
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while (true) {
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@ -658,24 +700,24 @@ AVCodecDecoder::_DecodeVideo(void* outBuffer, int64* outFrameCount,
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if (firstRun) {
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firstRun = false;
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mediaHeader->type = B_MEDIA_RAW_VIDEO;
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mediaHeader->start_time = chunkMediaHeader.start_time;
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fHeader.type = B_MEDIA_RAW_VIDEO;
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fHeader.start_time = chunkMediaHeader.start_time;
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fStartTime = chunkMediaHeader.start_time;
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mediaHeader->file_pos = 0;
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mediaHeader->orig_size = 0;
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mediaHeader->u.raw_video.field_gamma = 1.0;
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mediaHeader->u.raw_video.field_sequence = fFrame;
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mediaHeader->u.raw_video.field_number = 0;
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mediaHeader->u.raw_video.pulldown_number = 0;
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mediaHeader->u.raw_video.first_active_line = 1;
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mediaHeader->u.raw_video.line_count
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fHeader.file_pos = 0;
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fHeader.orig_size = 0;
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fHeader.u.raw_video.field_gamma = 1.0;
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fHeader.u.raw_video.field_sequence = fFrame;
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fHeader.u.raw_video.field_number = 0;
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fHeader.u.raw_video.pulldown_number = 0;
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fHeader.u.raw_video.first_active_line = 1;
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fHeader.u.raw_video.line_count
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= fOutputVideoFormat.display.line_count;
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TRACE("[v] start_time=%02d:%02d.%02d field_sequence=%lu\n",
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int((mediaHeader->start_time / 60000000) % 60),
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int((mediaHeader->start_time / 1000000) % 60),
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int((mediaHeader->start_time / 10000) % 100),
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mediaHeader->u.raw_video.field_sequence);
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int((fHeader.start_time / 60000000) % 60),
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int((fHeader.start_time / 1000000) % 60),
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int((fHeader.start_time / 10000) % 100),
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fHeader.u.raw_video.field_sequence);
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}
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#if DO_PROFILING
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@ -690,8 +732,8 @@ AVCodecDecoder::_DecodeVideo(void* outBuffer, int64* outFrameCount,
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fTempPacket.data = (uint8_t*)fChunkBuffer;
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fTempPacket.size = fChunkBufferSize;
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int gotPicture = 0;
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int len = avcodec_decode_video2(fContext, fInputPicture, &gotPicture,
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&fTempPacket);
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int len = avcodec_decode_video2(fContext, fRawDecodedPicture,
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&gotPicture, &fTempPacket);
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if (len < 0) {
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TRACE("[v] AVCodecDecoder: error in decoding frame %lld: %d\n",
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fFrame, len);
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@ -708,10 +750,10 @@ AVCodecDecoder::_DecodeVideo(void* outBuffer, int64* outFrameCount,
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// fContext->frame_rate);
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//TRACE("FFDEC: PTS = %d:%d:%d.%d - fContext->frame_number = %ld "
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// "fContext->frame_rate = %ld\n",
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// (int)(fInputPicture->pts / (60*60*1000000)),
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// (int)(fInputPicture->pts / (60*1000000)),
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// (int)(fInputPicture->pts / (1000000)),
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// (int)(fInputPicture->pts % 1000000), fContext->frame_number,
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// (int)(fRawDecodedPicture->pts / (60*60*1000000)),
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// (int)(fRawDecodedPicture->pts / (60*1000000)),
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// (int)(fRawDecodedPicture->pts / (1000000)),
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// (int)(fRawDecodedPicture->pts % 1000000), fContext->frame_number,
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// fContext->frame_rate);
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if (gotPicture) {
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@ -720,21 +762,21 @@ AVCodecDecoder::_DecodeVideo(void* outBuffer, int64* outFrameCount,
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AVPicture deinterlacedPicture;
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bool useDeinterlacedPicture = false;
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if (fInputPicture->interlaced_frame) {
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AVPicture source;
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source.data[0] = fInputPicture->data[0];
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source.data[1] = fInputPicture->data[1];
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source.data[2] = fInputPicture->data[2];
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source.data[3] = fInputPicture->data[3];
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source.linesize[0] = fInputPicture->linesize[0];
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source.linesize[1] = fInputPicture->linesize[1];
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source.linesize[2] = fInputPicture->linesize[2];
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source.linesize[3] = fInputPicture->linesize[3];
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if (fRawDecodedPicture->interlaced_frame) {
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AVPicture rawPicture;
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rawPicture.data[0] = fRawDecodedPicture->data[0];
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rawPicture.data[1] = fRawDecodedPicture->data[1];
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rawPicture.data[2] = fRawDecodedPicture->data[2];
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rawPicture.data[3] = fRawDecodedPicture->data[3];
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rawPicture.linesize[0] = fRawDecodedPicture->linesize[0];
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rawPicture.linesize[1] = fRawDecodedPicture->linesize[1];
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rawPicture.linesize[2] = fRawDecodedPicture->linesize[2];
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rawPicture.linesize[3] = fRawDecodedPicture->linesize[3];
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avpicture_alloc(&deinterlacedPicture,
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fContext->pix_fmt, width, height);
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if (avpicture_deinterlace(&deinterlacedPicture, &source,
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if (avpicture_deinterlace(&deinterlacedPicture, &rawPicture,
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fContext->pix_fmt, width, height) < 0) {
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TRACE("[v] avpicture_deinterlace() - error\n");
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} else
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@ -763,8 +805,16 @@ AVCodecDecoder::_DecodeVideo(void* outBuffer, int64* outFrameCount,
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}
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#endif
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fOutputPicture->data[0] = (uint8_t*)outBuffer;
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fOutputPicture->linesize[0]
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fDecodedDataSizeInBytes = avpicture_get_size(
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colorspace_to_pixfmt(fOutputVideoFormat.display.format),
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fContext->width, fContext->height);
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if (fDecodedData == NULL)
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fDecodedData
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= static_cast<uint8_t*>(malloc(fDecodedDataSizeInBytes));
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fPostProcessedDecodedPicture->data[0] = fDecodedData;
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fPostProcessedDecodedPicture->linesize[0]
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= fOutputVideoFormat.display.bytes_per_row;
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#if USE_SWS_FOR_COLOR_SPACE_CONVERSION
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@ -773,42 +823,47 @@ AVCodecDecoder::_DecodeVideo(void* outBuffer, int64* outFrameCount,
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if (fFormatConversionFunc != NULL) {
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#endif
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if (useDeinterlacedPicture) {
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AVFrame inputFrame;
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inputFrame.data[0] = deinterlacedPicture.data[0];
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inputFrame.data[1] = deinterlacedPicture.data[1];
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inputFrame.data[2] = deinterlacedPicture.data[2];
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inputFrame.data[3] = deinterlacedPicture.data[3];
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inputFrame.linesize[0] = deinterlacedPicture.linesize[0];
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inputFrame.linesize[1] = deinterlacedPicture.linesize[1];
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inputFrame.linesize[2] = deinterlacedPicture.linesize[2];
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inputFrame.linesize[3] = deinterlacedPicture.linesize[3];
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AVFrame deinterlacedFrame;
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deinterlacedFrame.data[0] = deinterlacedPicture.data[0];
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deinterlacedFrame.data[1] = deinterlacedPicture.data[1];
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deinterlacedFrame.data[2] = deinterlacedPicture.data[2];
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deinterlacedFrame.data[3] = deinterlacedPicture.data[3];
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deinterlacedFrame.linesize[0]
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= deinterlacedPicture.linesize[0];
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deinterlacedFrame.linesize[1]
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= deinterlacedPicture.linesize[1];
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deinterlacedFrame.linesize[2]
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= deinterlacedPicture.linesize[2];
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deinterlacedFrame.linesize[3]
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= deinterlacedPicture.linesize[3];
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#if USE_SWS_FOR_COLOR_SPACE_CONVERSION
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sws_scale(fSwsContext, inputFrame.data,
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inputFrame.linesize, 0, fContext->height,
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fOutputPicture->data, fOutputPicture->linesize);
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sws_scale(fSwsContext, deinterlacedFrame.data,
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deinterlacedFrame.linesize, 0, fContext->height,
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fPostProcessedDecodedPicture->data,
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fPostProcessedDecodedPicture->linesize);
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#else
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(*fFormatConversionFunc)(&inputFrame,
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fOutputPicture, width, height);
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(*fFormatConversionFunc)(&deinterlacedFrame,
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fPostProcessedDecodedPicture, width, height);
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#endif
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} else {
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#if USE_SWS_FOR_COLOR_SPACE_CONVERSION
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sws_scale(fSwsContext, fInputPicture->data,
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fInputPicture->linesize, 0, fContext->height,
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fOutputPicture->data, fOutputPicture->linesize);
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sws_scale(fSwsContext, fRawDecodedPicture->data,
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fRawDecodedPicture->linesize, 0, fContext->height,
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fPostProcessedDecodedPicture->data,
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fPostProcessedDecodedPicture->linesize);
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#else
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(*fFormatConversionFunc)(fInputPicture, fOutputPicture,
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width, height);
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(*fFormatConversionFunc)(fRawDecodedPicture,
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fPostProcessedDecodedPicture, width, height);
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#endif
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}
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}
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if (fInputPicture->interlaced_frame)
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if (fRawDecodedPicture->interlaced_frame)
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avpicture_free(&deinterlacedPicture);
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#ifdef DEBUG
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dump_ffframe(fInputPicture, "ffpict");
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// dump_ffframe(fOutputPicture, "opict");
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dump_ffframe(fRawDecodedPicture, "ffpict");
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// dump_ffframe(fPostProcessedDecodedPicture, "opict");
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#endif
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*outFrameCount = 1;
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fFrame++;
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#if DO_PROFILING
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@ -842,5 +897,3 @@ AVCodecDecoder::_DecodeVideo(void* outBuffer, int64* outFrameCount,
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}
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}
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}
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@ -64,6 +64,8 @@ private:
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media_header* mediaHeader,
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media_decode_info* info);
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status_t _DecodeNextVideoFrame();
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media_header fHeader;
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media_format fInputFormat;
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@ -75,8 +77,10 @@ private:
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// FFmpeg related members
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AVCodec* fCodec;
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AVCodecContext* fContext;
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AVFrame* fInputPicture;
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AVFrame* fOutputPicture;
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uint8_t* fDecodedData;
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size_t fDecodedDataSizeInBytes;
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AVFrame* fPostProcessedDecodedPicture;
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AVFrame* fRawDecodedPicture;
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bool fCodecInitDone;
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