зеркало из https://github.com/mozilla/gecko-dev.git
77 строки
2.7 KiB
C++
77 строки
2.7 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim:set ts=2 sw=2 sts=2 et cindent: */
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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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#if !defined(RtspMediaCodecReader_h_)
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#define RtspMediaCodecReader_h_
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#include "MediaCodecReader.h"
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namespace mozilla {
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class AbstractMediaDecoder;
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class RtspMediaResource;
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/* RtspMediaCodecReader is a subclass of MediaCodecReader.
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* The major reason that RtspMediaCodecReader inherit from MediaCodecReader is
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* the same video/audio decoding logic we can reuse.
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*/
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class RtspMediaCodecReader final : public MediaCodecReader
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{
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protected:
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// Provide a Rtsp extractor.
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virtual bool CreateExtractor() override;
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// Ensure the play command is sent to Rtsp server.
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void EnsureActive();
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public:
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RtspMediaCodecReader(AbstractMediaDecoder* aDecoder);
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virtual ~RtspMediaCodecReader();
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// Implement a time-based seek instead of byte-based.
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virtual nsRefPtr<SeekPromise>
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Seek(int64_t aTime, int64_t aEndTime) override;
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// Override GetBuffered() to do nothing for below reasons:
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// 1. Because the Rtsp stream is a/v separated. The buffered data in a/v
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// tracks are not consistent with time stamp.
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// For example: audio buffer: 1~2s, video buffer: 1.5~2.5s
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// 2. Since the Rtsp is a realtime streaming, the buffer we made for
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// RtspMediaResource is quite small. The small buffer implies the time ranges
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// we returned are not useful for the MediaDecodeStateMachine. Unlike the
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// ChannelMediaResource, it has a "cache" that can store the whole streaming
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// data so the |GetBuffered| function can retrieve useful time ranges.
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virtual media::TimeIntervals GetBuffered() override {
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return media::TimeIntervals::Invalid();
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}
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virtual void SetIdle() override;
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// Disptach a DecodeVideoFrameTask to decode video data.
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virtual nsRefPtr<VideoDataPromise>
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RequestVideoData(bool aSkipToNextKeyframe,
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int64_t aTimeThreshold) override;
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// Disptach a DecodeAudioDataTask to decode audio data.
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virtual nsRefPtr<AudioDataPromise> RequestAudioData() override;
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virtual nsRefPtr<MediaDecoderReader::MetadataPromise> AsyncReadMetadata()
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override;
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virtual void HandleResourceAllocated() override;
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private:
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// A pointer to RtspMediaResource for calling the Rtsp specific function.
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// The lifetime of mRtspResource is controlled by MediaDecoder. MediaDecoder
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// holds the MediaDecoderStateMachine and RtspMediaResource.
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// And MediaDecoderStateMachine holds this RtspMediaCodecReader.
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RtspMediaResource* mRtspResource;
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};
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} // namespace mozilla
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#endif
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