зеркало из https://github.com/mozilla/gecko-dev.git
107 строки
3.6 KiB
C++
107 строки
3.6 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 the libvpx library.
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* We implement a realtime and variable frame rate encoder. In order to achieve
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* that, there is a frame-drop encoding policy implemented in GetEncodedTrack.
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*/
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class VP8TrackEncoder : public VideoTrackEncoder {
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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(RefPtr<DriftCompensator> aDriftCompensator,
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TrackRate aTrackRate, FrameDroppingMode aFrameDroppingMode);
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virtual ~VP8TrackEncoder();
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already_AddRefed<TrackMetadataBase> GetMetadata() final;
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nsresult GetEncodedTrack(nsTArray<RefPtr<EncodedFrame>>& aData) final;
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protected:
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nsresult Init(int32_t aWidth, int32_t aHeight, int32_t aDisplayWidth,
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int32_t aDisplayHeight) final;
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private:
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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: NS_ERROR_NOT_AVAILABABLE if the vpx_codec_get_cx_data returns
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// null for EOS detection.
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// NS_OK if some data was appended to aData.
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// An error nsresult otherwise.
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nsresult GetEncodedPartitions(nsTArray<RefPtr<EncodedFrame>>& 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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// Re-configures an existing encoder with a new frame size.
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nsresult Reconfigure(int32_t aWidth, int32_t aHeight, int32_t aDisplayWidth,
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int32_t aDisplayHeight);
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// Destroys the context and image wrapper. Does not de-allocate the structs.
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void Destroy();
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// Helper method to set the values on a VPX configuration.
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nsresult SetConfigurationValues(int32_t aWidth, int32_t aHeight,
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int32_t aDisplayWidth, int32_t aDisplayHeight,
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vpx_codec_enc_cfg_t& config);
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// Encoded timestamp.
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StreamTime mEncodedTimestamp = 0;
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// Total duration in mTrackRate extracted by GetEncodedPartitions().
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CheckedInt64 mExtractedDuration;
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// Total duration in microseconds extracted by GetEncodedPartitions().
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CheckedInt64 mExtractedDurationUs;
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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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UniquePtr<uint8_t[]> mI420Frame;
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size_t mI420FrameSize = 0;
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/**
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* A duration of non-key frames in milliseconds.
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*/
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StreamTime mDurationSinceLastKeyframe = 0;
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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().
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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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