зеркало из https://github.com/mozilla/gecko-dev.git
75 строки
2.4 KiB
C++
75 строки
2.4 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-*/
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef TrackMetadataBase_h_
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#define TrackMetadataBase_h_
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#include "nsTArray.h"
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#include "nsCOMPtr.h"
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namespace mozilla {
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// A class represent meta data for various codec format. Only support one track information.
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class TrackMetadataBase
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{
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public:
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NS_INLINE_DECL_THREADSAFE_REFCOUNTING(TrackMetadataBase)
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enum MetadataKind {
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METADATA_OPUS, // Represent the Opus metadata
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METADATA_VP8,
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METADATA_VORBIS,
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METADATA_AVC,
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METADATA_AAC,
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METADATA_AMR,
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METADATA_UNKNOWN // Metadata Kind not set
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};
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// Return the specific metadata kind
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virtual MetadataKind GetKind() const = 0;
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protected:
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// Protected destructor, to discourage deletion outside of Release():
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virtual ~TrackMetadataBase() {}
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};
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// The base class for audio metadata.
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class AudioTrackMetadata : public TrackMetadataBase {
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public:
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// The duration of each sample set generated by encoder. (counted by samples)
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// If the duration is variant, this value should return 0.
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virtual uint32_t GetAudioFrameDuration() = 0;
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// The size of each sample set generated by encoder. (counted by byte)
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// If the size is variant, this value should return 0.
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virtual uint32_t GetAudioFrameSize() = 0;
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// AudioSampleRate is the number of audio sample per second.
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virtual uint32_t GetAudioSampleRate() = 0;
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virtual uint32_t GetAudioChannels() = 0;
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};
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// The base class for video metadata.
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class VideoTrackMetadata : public TrackMetadataBase {
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public:
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// VideoHeight and VideoWidth are the frame size of the elementary stream.
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virtual uint32_t GetVideoHeight() = 0;
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virtual uint32_t GetVideoWidth() = 0;
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// VideoDisplayHeight and VideoDisplayWidth are the display frame size.
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virtual uint32_t GetVideoDisplayHeight() = 0;
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virtual uint32_t GetVideoDisplayWidth() = 0;
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// VideoClockRate is the number of samples per second in video frame's
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// timestamp.
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// For example, if VideoClockRate is 90k Hz and VideoFrameRate is
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// 30 fps, each frame's sample duration will be 3000 Hz.
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virtual uint32_t GetVideoClockRate() = 0;
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// VideoFrameRate is numner of frames per second.
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virtual uint32_t GetVideoFrameRate() = 0;
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};
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}
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#endif
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