mirror of
https://gitlab.winehq.org/wine/wine-gecko.git
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136 lines
3.6 KiB
C++
136 lines
3.6 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 "nsDOMMediaStream.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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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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class MediaEngine
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{
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public:
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virtual ~MediaEngine() {};
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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() = 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, StreamTime aDesiredTime) = 0;
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/* Stop the device and release the corresponding MediaStream */
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virtual nsresult Stop() = 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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enum MediaEngineVideoCodecType {
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kVideoCodecH263,
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kVideoCodecVP8,
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kVideoCodecI420
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};
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struct MediaEngineVideoOptions {
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uint32_t mWidth;
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uint32_t mHeight;
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uint32_t mMaxFPS;
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MediaEngineVideoCodecType codecType;
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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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/* Return a MediaEngineVideoOptions struct with appropriate values for all
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* fields. */
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virtual const MediaEngineVideoOptions *GetOptions() = 0;
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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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