зеркало из https://github.com/mozilla/gecko-dev.git
147 строки
4.1 KiB
C++
147 строки
4.1 KiB
C++
/* 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 MEDIAENGINE_H_
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#define MEDIAENGINE_H_
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#include "nsIDOMFile.h"
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#include "DOMMediaStream.h"
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#include "MediaStreamGraph.h"
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namespace mozilla {
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/**
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* Abstract interface for managing audio and video devices. Each platform
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* must implement a concrete class that will map these classes and methods
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* to the appropriate backend. For example, on Desktop platforms, these will
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* correspond to equivalent webrtc (GIPS) calls, and on B2G they will map to
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* a Gonk interface.
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*/
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class MediaEngineVideoSource;
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class MediaEngineAudioSource;
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struct MediaEnginePrefs;
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enum MediaEngineState {
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kAllocated,
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kStarted,
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kStopped,
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kReleased
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};
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// We only support 1 audio and 1 video track for now.
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enum {
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kVideoTrack = 1,
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kAudioTrack = 2
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};
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class MediaEngine
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{
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public:
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virtual ~MediaEngine() {}
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static const int DEFAULT_VIDEO_FPS = 30;
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static const int DEFAULT_VIDEO_MIN_FPS = 10;
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static const int DEFAULT_VIDEO_WIDTH = 640;
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static const int DEFAULT_VIDEO_HEIGHT = 480;
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/* Populate an array of video sources in the nsTArray. Also include devices
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* that are currently unavailable. */
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virtual void EnumerateVideoDevices(nsTArray<nsRefPtr<MediaEngineVideoSource> >*) = 0;
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/* Populate an array of audio sources in the nsTArray. Also include devices
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* that are currently unavailable. */
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virtual void EnumerateAudioDevices(nsTArray<nsRefPtr<MediaEngineAudioSource> >*) = 0;
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};
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/**
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* Common abstract base class for audio and video sources.
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*/
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class MediaEngineSource : public nsISupports
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{
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public:
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virtual ~MediaEngineSource() {}
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/* Populate the human readable name of this device in the nsAString */
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virtual void GetName(nsAString&) = 0;
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/* Populate the UUID of this device in the nsAString */
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virtual void GetUUID(nsAString&) = 0;
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/* This call reserves but does not start the device. */
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virtual nsresult Allocate(const MediaEnginePrefs &aPrefs) = 0;
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/* Release the device back to the system. */
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virtual nsresult Deallocate() = 0;
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/* Start the device and add the track to the provided SourceMediaStream, with
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* the provided TrackID. You may start appending data to the track
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* immediately after. */
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virtual nsresult Start(SourceMediaStream*, TrackID) = 0;
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/* Take a snapshot from this source. In the case of video this is a single
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* image, and for audio, it is a snippet lasting aDuration milliseconds. The
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* duration argument is ignored for a MediaEngineVideoSource.
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*/
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virtual nsresult Snapshot(uint32_t aDuration, nsIDOMFile** aFile) = 0;
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/* Called when the stream wants more data */
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virtual void NotifyPull(MediaStreamGraph* aGraph,
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SourceMediaStream *aSource,
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TrackID aId,
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StreamTime aDesiredTime,
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TrackTicks &aLastEndTime) = 0;
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/* Stop the device and release the corresponding MediaStream */
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virtual nsresult Stop(SourceMediaStream *aSource, TrackID aID) = 0;
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/* Change device configuration. */
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virtual nsresult Config(bool aEchoOn, uint32_t aEcho,
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bool aAgcOn, uint32_t aAGC,
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bool aNoiseOn, uint32_t aNoise) = 0;
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/* Return false if device is currently allocated or started */
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bool IsAvailable() {
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if (mState == kAllocated || mState == kStarted) {
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return false;
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} else {
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return true;
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}
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}
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/* It is an error to call Start() before an Allocate(), and Stop() before
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* a Start(). Only Allocate() may be called after a Deallocate(). */
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protected:
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MediaEngineState mState;
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};
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/**
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* Video source and friends.
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*/
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struct MediaEnginePrefs {
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int32_t mWidth;
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int32_t mHeight;
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int32_t mFPS;
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int32_t mMinFPS;
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};
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class MediaEngineVideoSource : public MediaEngineSource
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{
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public:
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virtual ~MediaEngineVideoSource() {}
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};
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/**
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* Audio source and friends.
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*/
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class MediaEngineAudioSource : public MediaEngineSource
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{
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public:
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virtual ~MediaEngineAudioSource() {}
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};
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}
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#endif /* MEDIAENGINE_H_ */
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