gecko-dev/dom/media/MediaData.h

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/* -*- 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(MediaData_h)
#define MediaData_h
#include "nsSize.h"
#include "mozilla/gfx/Rect.h"
#include "nsRect.h"
#include "AudioSampleFormat.h"
#include "nsIMemoryReporter.h"
#include "SharedBuffer.h"
namespace mozilla {
namespace layers {
class Image;
class ImageContainer;
}
// Container that holds media samples.
class MediaData {
public:
enum Type {
AUDIO_DATA = 0,
VIDEO_DATA
};
MediaData(Type aType,
int64_t aOffset,
int64_t aTimestamp,
int64_t aDuration)
: mType(aType)
, mOffset(aOffset)
, mTime(aTimestamp)
, mDuration(aDuration)
, mDiscontinuity(false)
{}
virtual ~MediaData() {}
// Type of contained data.
const Type mType;
// Approximate byte offset where this data was demuxed from its media.
const int64_t mOffset;
// Start time of sample, in microseconds.
const int64_t mTime;
// Duration of sample, in microseconds.
const int64_t mDuration;
// True if this is the first sample after a gap or discontinuity in
// the stream. This is true for the first sample in a stream after a seek.
bool mDiscontinuity;
int64_t GetEndTime() const { return mTime + mDuration; }
};
// Holds chunk a decoded audio frames.
class AudioData : public MediaData {
public:
AudioData(int64_t aOffset,
int64_t aTime,
int64_t aDuration,
uint32_t aFrames,
AudioDataValue* aData,
uint32_t aChannels,
uint32_t aRate)
: MediaData(AUDIO_DATA, aOffset, aTime, aDuration)
, mFrames(aFrames)
, mChannels(aChannels)
, mRate(aRate)
, mAudioData(aData)
{
MOZ_COUNT_CTOR(AudioData);
}
~AudioData()
{
MOZ_COUNT_DTOR(AudioData);
}
size_t SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const;
// If mAudioBuffer is null, creates it from mAudioData.
void EnsureAudioBuffer();
const uint32_t mFrames;
const uint32_t mChannels;
const uint32_t mRate;
// At least one of mAudioBuffer/mAudioData must be non-null.
// mChannels channels, each with mFrames frames
nsRefPtr<SharedBuffer> mAudioBuffer;
// mFrames frames, each with mChannels values
nsAutoArrayPtr<AudioDataValue> mAudioData;
};
namespace layers {
class TextureClient;
class PlanarYCbCrImage;
}
class VideoInfo;
// Holds a decoded video frame, in YCbCr format. These are queued in the reader.
class VideoData : public MediaData {
public:
typedef gfx::IntRect IntRect;
typedef gfx::IntSize IntSize;
typedef layers::ImageContainer ImageContainer;
typedef layers::Image Image;
typedef layers::PlanarYCbCrImage PlanarYCbCrImage;
// YCbCr data obtained from decoding the video. The index's are:
// 0 = Y
// 1 = Cb
// 2 = Cr
struct YCbCrBuffer {
struct Plane {
uint8_t* mData;
uint32_t mWidth;
uint32_t mHeight;
uint32_t mStride;
uint32_t mOffset;
uint32_t mSkip;
};
Plane mPlanes[3];
};
// Constructs a VideoData object. If aImage is nullptr, creates a new Image
// holding a copy of the YCbCr data passed in aBuffer. If aImage is not
// nullptr, it's stored as the underlying video image and aBuffer is assumed
// to point to memory within aImage so no copy is made. aTimecode is a codec
// specific number representing the timestamp of the frame of video data.
// Returns nsnull if an error occurs. This may indicate that memory couldn't
// be allocated to create the VideoData object, or it may indicate some
// problem with the input data (e.g. negative stride).
static VideoData* Create(VideoInfo& aInfo,
ImageContainer* aContainer,
Image* aImage,
int64_t aOffset,
int64_t aTime,
int64_t aDuration,
const YCbCrBuffer &aBuffer,
bool aKeyframe,
int64_t aTimecode,
const IntRect& aPicture);
// Variant that always makes a copy of aBuffer
static VideoData* Create(VideoInfo& aInfo,
ImageContainer* aContainer,
int64_t aOffset,
int64_t aTime,
int64_t aDuration,
const YCbCrBuffer &aBuffer,
bool aKeyframe,
int64_t aTimecode,
const IntRect& aPicture);
// Variant to create a VideoData instance given an existing aImage
static VideoData* Create(VideoInfo& aInfo,
Image* aImage,
int64_t aOffset,
int64_t aTime,
int64_t aDuration,
const YCbCrBuffer &aBuffer,
bool aKeyframe,
int64_t aTimecode,
const IntRect& aPicture);
static VideoData* Create(VideoInfo& aInfo,
ImageContainer* aContainer,
int64_t aOffset,
int64_t aTime,
int64_t aDuration,
layers::TextureClient* aBuffer,
bool aKeyframe,
int64_t aTimecode,
const IntRect& aPicture);
static VideoData* CreateFromImage(VideoInfo& aInfo,
ImageContainer* aContainer,
int64_t aOffset,
int64_t aTime,
int64_t aDuration,
const nsRefPtr<Image>& aImage,
bool aKeyframe,
int64_t aTimecode,
const IntRect& aPicture);
// Creates a new VideoData identical to aOther, but with a different
// specified duration. All data from aOther is copied into the new
// VideoData. The new VideoData's mImage field holds a reference to
// aOther's mImage, i.e. the Image is not copied. This function is useful
// in reader backends that can't determine the duration of a VideoData
// until the next frame is decoded, i.e. it's a way to change the const
// duration field on a VideoData.
static VideoData* ShallowCopyUpdateDuration(VideoData* aOther,
int64_t aDuration);
// Creates a new VideoData identical to aOther, but with a different
// specified timestamp. All data from aOther is copied into the new
// VideoData, as ShallowCopyUpdateDuration() does.
static VideoData* ShallowCopyUpdateTimestamp(VideoData* aOther,
int64_t aTimestamp);
// Creates a new VideoData identical to aOther, but with a different
// specified timestamp and duration. All data from aOther is copied
// into the new VideoData, as ShallowCopyUpdateDuration() does.
static VideoData* ShallowCopyUpdateTimestampAndDuration(VideoData* aOther,
int64_t aTimestamp,
int64_t aDuration);
// Initialize PlanarYCbCrImage. Only When aCopyData is true,
// video data is copied to PlanarYCbCrImage.
static void SetVideoDataToImage(PlanarYCbCrImage* aVideoImage,
VideoInfo& aInfo,
const YCbCrBuffer &aBuffer,
const IntRect& aPicture,
bool aCopyData);
// Constructs a duplicate VideoData object. This intrinsically tells the
// player that it does not need to update the displayed frame when this
// frame is played; this frame is identical to the previous.
static VideoData* CreateDuplicate(int64_t aOffset,
int64_t aTime,
int64_t aDuration,
int64_t aTimecode)
{
return new VideoData(aOffset, aTime, aDuration, aTimecode);
}
~VideoData();
size_t SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const;
// Dimensions at which to display the video frame. The picture region
// will be scaled to this size. This is should be the picture region's
// dimensions scaled with respect to its aspect ratio.
const IntSize mDisplay;
// Codec specific internal time code. For Ogg based codecs this is the
// granulepos.
const int64_t mTimecode;
// This frame's image.
nsRefPtr<Image> mImage;
// When true, denotes that this frame is identical to the frame that
// came before; it's a duplicate. mBuffer will be empty.
const bool mDuplicate;
const bool mKeyframe;
public:
VideoData(int64_t aOffset,
int64_t aTime,
int64_t aDuration,
int64_t aTimecode);
VideoData(int64_t aOffset,
int64_t aTime,
int64_t aDuration,
bool aKeyframe,
int64_t aTimecode,
IntSize aDisplay);
};
} // namespace mozilla
#endif // MediaData_h