зеркало из https://github.com/mozilla/gecko-dev.git
97 строки
3.1 KiB
C++
97 строки
3.1 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-*/
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef VP8TrackEncoder_h_
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#define VP8TrackEncoder_h_
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#include "TrackEncoder.h"
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#include "vpx/vpx_codec.h"
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namespace mozilla {
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typedef struct vpx_codec_ctx vpx_codec_ctx_t;
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typedef struct vpx_codec_enc_cfg vpx_codec_enc_cfg_t;
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typedef struct vpx_image vpx_image_t;
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/**
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* VP8TrackEncoder implements VideoTrackEncoder by using libvpx library.
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* We implement a realtime and fixed FPS encoder. In order to achieve that,
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* there is a pick target frame and drop frame encoding policy implemented in
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* GetEncodedTrack.
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*/
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class VP8TrackEncoder : public VideoTrackEncoder
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{
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enum EncodeOperation {
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ENCODE_NORMAL_FRAME, // VP8 track encoder works normally.
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ENCODE_I_FRAME, // The next frame will be encoded as I-Frame.
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SKIP_FRAME, // Skip the next frame.
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};
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public:
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VP8TrackEncoder();
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virtual ~VP8TrackEncoder();
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already_AddRefed<TrackMetadataBase> GetMetadata() final override;
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nsresult GetEncodedTrack(EncodedFrameContainer& aData) final override;
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protected:
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nsresult Init(int32_t aWidth, int32_t aHeight,
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int32_t aDisplayWidth, int32_t aDisplayHeight,
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TrackRate aTrackRate) final override;
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private:
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// Calculate the target frame's encoded duration.
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StreamTime CalculateEncodedDuration(StreamTime aDurationCopied);
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// Calculate the mRemainingTicks for next target frame.
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StreamTime CalculateRemainingTicks(StreamTime aDurationCopied,
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StreamTime aEncodedDuration);
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// Get the EncodeOperation for next target frame.
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EncodeOperation GetNextEncodeOperation(TimeDuration aTimeElapsed,
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StreamTime aProcessedDuration);
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// Get the encoded data from encoder to aData.
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// Return value: false if the vpx_codec_get_cx_data returns null
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// for EOS detection.
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bool GetEncodedPartitions(EncodedFrameContainer& aData);
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// Prepare the input data to the mVPXImageWrapper for encoding.
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nsresult PrepareRawFrame(VideoChunk &aChunk);
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// Output frame rate.
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uint32_t mEncodedFrameRate;
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// Duration for the output frame, reciprocal to mEncodedFrameRate.
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StreamTime mEncodedFrameDuration;
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// Encoded timestamp.
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StreamTime mEncodedTimestamp;
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// Duration to the next encode frame.
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StreamTime mRemainingTicks;
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// Muted frame, we only create it once.
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RefPtr<layers::Image> mMuteFrame;
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// I420 frame, for converting to I420.
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nsTArray<uint8_t> mI420Frame;
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/**
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* A local segment queue which takes the raw data out from mRawSegment in the
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* call of GetEncodedTrack(). Since we implement the fixed FPS encoding
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* policy, it needs to be global in order to store the leftover segments
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* taken from mRawSegment.
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*/
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VideoSegment mSourceSegment;
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// VP8 relative members.
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// Codec context structure.
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nsAutoPtr<vpx_codec_ctx_t> mVPXContext;
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// Image Descriptor.
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nsAutoPtr<vpx_image_t> mVPXImageWrapper;
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};
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} // namespace mozilla
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#endif
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