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