gecko/dom/media/MediaInfo.h

247 lines
5.2 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 "nsRect.h"
#include "nsRefPtr.h"
#include "nsSize.h"
#include "nsString.h"
#include "nsTArray.h"
#include "ImageTypes.h"
#include "MediaData.h"
#include "StreamBuffer.h" // for TrackID
namespace mozilla {
class TrackInfo {
public:
enum TrackType {
kUndefinedTrack,
kAudioTrack,
kVideoTrack,
kTextTrack
};
TrackInfo(TrackType aType,
const nsAString& aId,
const nsAString& aKind,
const nsAString& aLabel,
const nsAString& aLanguage,
bool aEnabled,
TrackID aTrackId = TRACK_INVALID)
: mId(aId)
, mKind(aKind)
, mLabel(aLabel)
, mLanguage(aLanguage)
, mEnabled(aEnabled)
, mTrackId(aTrackId)
, mDuration(0)
, mMediaTime(0)
, mType(aType)
{
}
// Only used for backward compatibility. Do not use in new code.
void Init(TrackType aType,
const nsAString& aId,
const nsAString& aKind,
const nsAString& aLabel,
const nsAString& aLanguage,
bool aEnabled,
TrackID aTrackId = TRACK_INVALID)
{
mId = aId;
mKind = aKind;
mLabel = aLabel;
mLanguage = aLanguage;
mEnabled = aEnabled;
mTrackId = aTrackId;
mType = aType;
}
// Fields common with MediaTrack object.
nsString mId;
nsString mKind;
nsString mLabel;
nsString mLanguage;
bool mEnabled;
TrackID mTrackId;
nsAutoCString mMimeType;
int64_t mDuration;
int64_t mMediaTime;
CryptoTrack mCrypto;
bool IsAudio() const
{
return mType == kAudioTrack;
}
bool IsVideo() const
{
return mType == kVideoTrack;
}
bool IsText() const
{
return mType == kTextTrack;
}
TrackType GetType() const
{
return mType;
}
bool virtual IsValid() const = 0;
private:
TrackType mType;
};
// Stores info relevant to presenting media frames.
class VideoInfo : public TrackInfo {
public:
VideoInfo()
: VideoInfo(-1, -1)
{
}
VideoInfo(int32_t aWidth, int32_t aHeight)
: TrackInfo(kVideoTrack, NS_LITERAL_STRING("2"), NS_LITERAL_STRING("main"),
EmptyString(), EmptyString(), true, 2)
, mDisplay(nsIntSize(aWidth, aHeight))
, mStereoMode(StereoMode::MONO)
, mImage(nsIntSize(aWidth, aHeight))
, mExtraData(new DataBuffer)
{
}
virtual bool IsValid() const override
{
return mDisplay.width > 0 && mDisplay.height > 0;
}
// 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;
// Size in pixels of decoded video's image.
nsIntSize mImage;
nsRefPtr<DataBuffer> mExtraData;
};
class AudioInfo : public TrackInfo {
public:
AudioInfo()
: TrackInfo(kAudioTrack, NS_LITERAL_STRING("1"), NS_LITERAL_STRING("main"),
EmptyString(), EmptyString(), true, 1)
, mRate(0)
, mChannels(0)
, mBitDepth(0)
, mProfile(0)
, mExtendedProfile(0)
, mCodecSpecificConfig(new DataBuffer)
, mExtraData(new DataBuffer)
{
}
// Sample rate.
uint32_t mRate;
// Number of audio channels.
uint32_t mChannels;
// Bits per sample.
uint32_t mBitDepth;
// Codec profile.
int8_t mProfile;
// Extended codec profile.
int8_t mExtendedProfile;
nsRefPtr<DataBuffer> mCodecSpecificConfig;
nsRefPtr<DataBuffer> mExtraData;
virtual bool IsValid() const override
{
return mChannels > 0 && mRate > 0;
}
};
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.IsValid();
}
bool HasAudio() const
{
return mAudio.IsValid();
}
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