1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/content/media/encoder/TrackMetadataBase.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,74 @@
1.4 +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-*/
1.5 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.6 + * License, v. 2.0. If a copy of the MPL was not distributed with this file,
1.7 + * You can obtain one at http://mozilla.org/MPL/2.0/. */
1.8 +
1.9 +#ifndef TrackMetadataBase_h_
1.10 +#define TrackMetadataBase_h_
1.11 +
1.12 +#include "nsTArray.h"
1.13 +#include "nsCOMPtr.h"
1.14 +namespace mozilla {
1.15 +
1.16 +// A class represent meta data for various codec format. Only support one track information.
1.17 +class TrackMetadataBase
1.18 +{
1.19 +public:
1.20 + NS_INLINE_DECL_THREADSAFE_REFCOUNTING(TrackMetadataBase)
1.21 + enum MetadataKind {
1.22 + METADATA_OPUS, // Represent the Opus metadata
1.23 + METADATA_VP8,
1.24 + METADATA_VORBIS,
1.25 + METADATA_AVC,
1.26 + METADATA_AAC,
1.27 + METADATA_AMR,
1.28 + METADATA_UNKNOWN // Metadata Kind not set
1.29 + };
1.30 + // Return the specific metadata kind
1.31 + virtual MetadataKind GetKind() const = 0;
1.32 +
1.33 +protected:
1.34 + // Protected destructor, to discourage deletion outside of Release():
1.35 + virtual ~TrackMetadataBase() {}
1.36 +};
1.37 +
1.38 +// The base class for audio metadata.
1.39 +class AudioTrackMetadata : public TrackMetadataBase {
1.40 +public:
1.41 + // The duration of each sample set generated by encoder. (counted by samples)
1.42 + // If the duration is variant, this value should return 0.
1.43 + virtual uint32_t GetAudioFrameDuration() = 0;
1.44 +
1.45 + // The size of each sample set generated by encoder. (counted by byte)
1.46 + // If the size is variant, this value should return 0.
1.47 + virtual uint32_t GetAudioFrameSize() = 0;
1.48 +
1.49 + // AudioSampleRate is the number of audio sample per second.
1.50 + virtual uint32_t GetAudioSampleRate() = 0;
1.51 +
1.52 + virtual uint32_t GetAudioChannels() = 0;
1.53 +};
1.54 +
1.55 +// The base class for video metadata.
1.56 +class VideoTrackMetadata : public TrackMetadataBase {
1.57 +public:
1.58 + // VideoHeight and VideoWidth are the frame size of the elementary stream.
1.59 + virtual uint32_t GetVideoHeight() = 0;
1.60 + virtual uint32_t GetVideoWidth() = 0;
1.61 +
1.62 + // VideoDisplayHeight and VideoDisplayWidth are the display frame size.
1.63 + virtual uint32_t GetVideoDisplayHeight() = 0;
1.64 + virtual uint32_t GetVideoDisplayWidth() = 0;
1.65 +
1.66 + // VideoClockRate is the number of samples per second in video frame's
1.67 + // timestamp.
1.68 + // For example, if VideoClockRate is 90k Hz and VideoFrameRate is
1.69 + // 30 fps, each frame's sample duration will be 3000 Hz.
1.70 + virtual uint32_t GetVideoClockRate() = 0;
1.71 +
1.72 + // VideoFrameRate is numner of frames per second.
1.73 + virtual uint32_t GetVideoFrameRate() = 0;
1.74 +};
1.75 +
1.76 +}
1.77 +#endif
