The Tor Browser: content/media/encoder/TrackMetadataBase.h@44a2da4a2ab2

Replace accessor implementation with direct member state manipulation, by
request https://trac.torproject.org/projects/tor/ticket/9701#comment:32

     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/. */

     6 #ifndef TrackMetadataBase_h_

     7 #define TrackMetadataBase_h_

     9 #include "nsTArray.h"

    10 #include "nsCOMPtr.h"

    11 namespace mozilla {

    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;

    30 protected:

    31   // Protected destructor, to discourage deletion outside of Release():

    32   virtual ~TrackMetadataBase() {}

    33 };

    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;

    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;

    46   // AudioSampleRate is the number of audio sample per second.

    47   virtual uint32_t GetAudioSampleRate() = 0;

    49   virtual uint32_t GetAudioChannels() = 0;

    50 };

    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;

    59   // VideoDisplayHeight and VideoDisplayWidth are the display frame size.

    60   virtual uint32_t GetVideoDisplayHeight() = 0;

    61   virtual uint32_t GetVideoDisplayWidth() = 0;

    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;

    69   // VideoFrameRate is numner of frames per second.

    70   virtual uint32_t GetVideoFrameRate() = 0;

    71 };

    73 }

    74 #endif

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