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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-*/
/* 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/. */
#ifndef TrackMetadataBase_h_
#define TrackMetadataBase_h_
#include "nsTArray.h"
#include "nsCOMPtr.h"
namespace mozilla {
// A class represent meta data for various codec format. Only support one track
// information.
class TrackMetadataBase {
public:
NS_INLINE_DECL_THREADSAFE_REFCOUNTING(TrackMetadataBase)
enum MetadataKind {
METADATA_OPUS, // Represent the Opus metadata
METADATA_VP8,
METADATA_VORBIS,
METADATA_AVC,
METADATA_AAC,
METADATA_AMR,
METADATA_EVRC,
METADATA_UNKNOWN // Metadata Kind not set
};
// Return the specific metadata kind
virtual MetadataKind GetKind() const = 0;
protected:
// Protected destructor, to discourage deletion outside of Release():
virtual ~TrackMetadataBase() = default;
};
// The base class for audio metadata.
class AudioTrackMetadata : public TrackMetadataBase {
public:
// The duration of each sample set generated by encoder. (counted by samples)
// If the duration is variant, this value should return 0.
virtual uint32_t GetAudioFrameDuration() = 0;
// The size of each sample set generated by encoder. (counted by byte)
// If the size is variant, this value should return 0.
virtual uint32_t GetAudioFrameSize() = 0;
// AudioSampleRate is the number of audio sample per second.
virtual uint32_t GetAudioSampleRate() = 0;
virtual uint32_t GetAudioChannels() = 0;
};
// The base class for video metadata.
class VideoTrackMetadata : public TrackMetadataBase {
public:
// VideoHeight and VideoWidth are the frame size of the elementary stream.
virtual uint32_t GetVideoHeight() = 0;
virtual uint32_t GetVideoWidth() = 0;
// VideoDisplayHeight and VideoDisplayWidth are the display frame size.
virtual uint32_t GetVideoDisplayHeight() = 0;
virtual uint32_t GetVideoDisplayWidth() = 0;
// VideoClockRate is the number of samples per second in video frame's
// timestamp.
// For example, if VideoClockRate is 90k Hz and VideoFrameRate is
// 30 fps, each frame's sample duration will be 3000 Hz.
virtual uint32_t GetVideoClockRate() = 0;
// VideoFrameRate is numner of frames per second.
virtual uint32_t GetVideoFrameRate() = 0;
};
} // namespace mozilla
#endif