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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           0 : class TrackMetadataBase
      15             : {
      16             : public:
      17           0 :   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           0 :   virtual ~TrackMetadataBase() {}
      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