TrackMetadataBase.h (2495B)
1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-*/ 2 /* This Source Code Form is subject to the terms of the Mozilla Public 3 * License, v. 2.0. If a copy of the MPL was not distributed with this file, 4 * You can obtain one at http://mozilla.org/MPL/2.0/. */ 5 6 #ifndef TrackMetadataBase_h_ 7 #define TrackMetadataBase_h_ 8 9 #include "nsCOMPtr.h" 10 #include "nsTArray.h" 11 namespace mozilla { 12 13 // A class represent meta data for various codec format. Only support one track 14 // information. 15 class TrackMetadataBase { 16 public: 17 NS_INLINE_DECL_THREADSAFE_REFCOUNTING(TrackMetadataBase) 18 enum MetadataKind { 19 METADATA_OPUS, // Represent the Opus metadata 20 METADATA_VP8, 21 METADATA_VORBIS, 22 METADATA_AVC, 23 METADATA_AAC, 24 METADATA_AMR, 25 METADATA_EVRC, 26 METADATA_UNKNOWN // Metadata Kind not set 27 }; 28 // Return the specific metadata kind 29 virtual MetadataKind GetKind() const = 0; 30 31 protected: 32 // Protected destructor, to discourage deletion outside of Release(): 33 virtual ~TrackMetadataBase() = default; 34 }; 35 36 // The base class for audio metadata. 37 class AudioTrackMetadata : public TrackMetadataBase { 38 public: 39 // The duration of each sample set generated by encoder. (counted by samples) 40 // If the duration is variant, this value should return 0. 41 virtual uint32_t GetAudioFrameDuration() = 0; 42 43 // The size of each sample set generated by encoder. (counted by byte) 44 // If the size is variant, this value should return 0. 45 virtual uint32_t GetAudioFrameSize() = 0; 46 47 // AudioSampleRate is the number of audio sample per second. 48 virtual uint32_t GetAudioSampleRate() = 0; 49 50 virtual uint32_t GetAudioChannels() = 0; 51 }; 52 53 // The base class for video metadata. 54 class VideoTrackMetadata : public TrackMetadataBase { 55 public: 56 // VideoHeight and VideoWidth are the frame size of the elementary stream. 57 virtual uint32_t GetVideoHeight() = 0; 58 virtual uint32_t GetVideoWidth() = 0; 59 60 // VideoDisplayHeight and VideoDisplayWidth are the display frame size. 61 virtual uint32_t GetVideoDisplayHeight() = 0; 62 virtual uint32_t GetVideoDisplayWidth() = 0; 63 64 // VideoClockRate is the number of samples per second in video frame's 65 // timestamp. 66 // For example, if VideoClockRate is 90k Hz and VideoFrameRate is 67 // 30 fps, each frame's sample duration will be 3000 Hz. 68 virtual uint32_t GetVideoClockRate() = 0; 69 70 // VideoFrameRate is numner of frames per second. 71 virtual uint32_t GetVideoFrameRate() = 0; 72 }; 73 74 } // namespace mozilla 75 76 #endif