gecko-dev/dom/media/MediaInfo.h

177 lines
3.9 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 "nsTArray.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 EncryptionInfo {
public:
struct InitData {
template<typename AInitDatas>
InitData(const nsAString& aType, AInitDatas&& aInitData)
: mType(aType)
, mInitData(Forward<AInitDatas>(aInitData))
{
}
// Encryption type to be passed to JS. Usually `cenc'.
nsString mType;
// Encryption data.
nsTArray<uint8_t> mInitData;
};
typedef nsTArray<InitData> InitDatas;
// True if the stream has encryption metadata
bool IsEncrypted() const
{
return !mInitDatas.IsEmpty();
}
template<typename AInitDatas>
void AddInitData(const nsAString& aType, AInitDatas&& aInitData)
{
mInitDatas.AppendElement(InitData(aType, Forward<AInitDatas>(aInitData)));
}
void AddInitData(const EncryptionInfo& aInfo)
{
mInitDatas.AppendElements(aInfo.mInitDatas);
}
// One 'InitData' per encrypted buffer.
InitDatas mInitDatas;
};
class MediaInfo {
public:
bool HasVideo() const
{
return mVideo.mHasVideo;
}
bool HasAudio() const
{
return mAudio.mHasAudio;
}
bool IsEncrypted() const
{
return mCrypto.IsEncrypted();
}
bool HasValidMedia() const
{
return HasVideo() || HasAudio();
}
// TODO: Store VideoInfo and AudioIndo in arrays to support multi-tracks.
VideoInfo mVideo;
AudioInfo mAudio;
EncryptionInfo mCrypto;
};
} // namespace mozilla
#endif // MediaInfo_h