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comparison: content/media/encoder/TrackMetadataBase.h
content/media/encoder/TrackMetadataBase.h
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| 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 "nsTArray.h" | |
| 10 #include "nsCOMPtr.h" | |
| 11 namespace mozilla { | |
| 12 | |
| 13 // A class represent meta data for various codec format. Only support one track information. | |
| 14 class TrackMetadataBase | |
| 15 { | |
| 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_UNKNOWN // Metadata Kind not set | |
| 26 }; | |
| 27 // Return the specific metadata kind | |
| 28 virtual MetadataKind GetKind() const = 0; | |
| 29 | |
| 30 protected: | |
| 31 // Protected destructor, to discourage deletion outside of Release(): | |
| 32 virtual ~TrackMetadataBase() {} | |
| 33 }; | |
| 34 | |
| 35 // The base class for audio metadata. | |
| 36 class AudioTrackMetadata : public TrackMetadataBase { | |
| 37 public: | |
| 38 // The duration of each sample set generated by encoder. (counted by samples) | |
| 39 // If the duration is variant, this value should return 0. | |
| 40 virtual uint32_t GetAudioFrameDuration() = 0; | |
| 41 | |
| 42 // The size of each sample set generated by encoder. (counted by byte) | |
| 43 // If the size is variant, this value should return 0. | |
| 44 virtual uint32_t GetAudioFrameSize() = 0; | |
| 45 | |
| 46 // AudioSampleRate is the number of audio sample per second. | |
| 47 virtual uint32_t GetAudioSampleRate() = 0; | |
| 48 | |
| 49 virtual uint32_t GetAudioChannels() = 0; | |
| 50 }; | |
| 51 | |
| 52 // The base class for video metadata. | |
| 53 class VideoTrackMetadata : public TrackMetadataBase { | |
| 54 public: | |
| 55 // VideoHeight and VideoWidth are the frame size of the elementary stream. | |
| 56 virtual uint32_t GetVideoHeight() = 0; | |
| 57 virtual uint32_t GetVideoWidth() = 0; | |
| 58 | |
| 59 // VideoDisplayHeight and VideoDisplayWidth are the display frame size. | |
| 60 virtual uint32_t GetVideoDisplayHeight() = 0; | |
| 61 virtual uint32_t GetVideoDisplayWidth() = 0; | |
| 62 | |
| 63 // VideoClockRate is the number of samples per second in video frame's | |
| 64 // timestamp. | |
| 65 // For example, if VideoClockRate is 90k Hz and VideoFrameRate is | |
| 66 // 30 fps, each frame's sample duration will be 3000 Hz. | |
| 67 virtual uint32_t GetVideoClockRate() = 0; | |
| 68 | |
| 69 // VideoFrameRate is numner of frames per second. | |
| 70 virtual uint32_t GetVideoFrameRate() = 0; | |
| 71 }; | |
| 72 | |
| 73 } | |
| 74 #endif |
