gecko-dev/dom/media/MediaInfo.h

134 строки
3.0 KiB
C++

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#if !defined(MediaInfo_h)
#define MediaInfo_h
#include "nsSize.h"
#include "nsRect.h"
#include "ImageTypes.h"
#include "nsString.h"
#include "StreamBuffer.h" // for TrackID
namespace mozilla {
struct TrackInfo {
void Init(const nsAString& aId,
const nsAString& aKind,
const nsAString& aLabel,
const nsAString& aLanguage,
bool aEnabled,
TrackID aOutputId = TRACK_INVALID)
{
mId = aId;
mKind = aKind;
mLabel = aLabel;
mLanguage = aLanguage;
mEnabled = aEnabled;
mOutputId = aOutputId;
}
nsString mId;
nsString mKind;
nsString mLabel;
nsString mLanguage;
bool mEnabled;
TrackID mOutputId;
};
// Stores info relevant to presenting media frames.
class VideoInfo {
private:
void Init(int32_t aWidth, int32_t aHeight, bool aHasVideo)
{
mDisplay = nsIntSize(aWidth, aHeight);
mStereoMode = StereoMode::MONO;
mHasVideo = aHasVideo;
// TODO: TrackInfo should be initialized by its specific codec decoder.
// This following call should be removed once we have that implemented.
mTrackInfo.Init(NS_LITERAL_STRING("2"), NS_LITERAL_STRING("main"),
EmptyString(), EmptyString(), true, 2);
}
public:
VideoInfo()
{
Init(0, 0, false);
}
VideoInfo(int32_t aWidth, int32_t aHeight)
{
Init(aWidth, aHeight, true);
}
// Size in pixels at which the video is rendered. This is after it has
// been scaled by its aspect ratio.
nsIntSize mDisplay;
// Indicates the frame layout for single track stereo videos.
StereoMode mStereoMode;
// True if we have an active video bitstream.
bool mHasVideo;
TrackInfo mTrackInfo;
};
class AudioInfo {
public:
AudioInfo()
: mRate(44100)
, mChannels(2)
, mHasAudio(false)
{
// TODO: TrackInfo should be initialized by its specific codec decoder.
// This following call should be removed once we have that implemented.
mTrackInfo.Init(NS_LITERAL_STRING("1"), NS_LITERAL_STRING("main"),
EmptyString(), EmptyString(), true, 1);
}
// Sample rate.
uint32_t mRate;
// Number of audio channels.
uint32_t mChannels;
// True if we have an active audio bitstream.
bool mHasAudio;
TrackInfo mTrackInfo;
};
class MediaInfo {
public:
MediaInfo() : mIsEncrypted(false) {}
bool HasVideo() const
{
return mVideo.mHasVideo;
}
bool HasAudio() const
{
return mAudio.mHasAudio;
}
bool HasValidMedia() const
{
return HasVideo() || HasAudio();
}
bool mIsEncrypted;
// TODO: Store VideoInfo and AudioIndo in arrays to support multi-tracks.
VideoInfo mVideo;
AudioInfo mAudio;
};
} // namespace mozilla
#endif // MediaInfo_h