// Copyright 2014 Google Inc. All rights reserved. // // Use of this source code is governed by a BSD-style // license that can be found in the LICENSE file or at // https://developers.google.com/open-source/licenses/bsd #ifndef MEDIA_BASE_AUDIO_STREAM_INFO_H_ #define MEDIA_BASE_AUDIO_STREAM_INFO_H_ #include #include "media/base/stream_info.h" namespace media { enum AudioCodec { kUnknownAudioCodec = 0, kCodecAAC, kCodecMP3, kCodecPCM, kCodecVorbis, kCodecFLAC, kCodecAMR_NB, kCodecAMR_WB, kCodecPCM_MULAW, kCodecGSM_MS, kCodecPCM_S16BE, kCodecPCM_S24BE, kCodecOpus, kCodecEAC3, kNumAudioCodec }; /// Holds audio stream information. class AudioStreamInfo : public StreamInfo { public: /// Construct an initialized audio stream info object. AudioStreamInfo(int track_id, uint32 time_scale, uint64 duration, AudioCodec codec, const std::string& codec_string, const std::string& language, uint8 sample_bits, uint8 num_channels, uint32 sampling_frequency, const uint8* extra_data, size_t extra_data_size, bool is_encrypted); /// @name StreamInfo implementation overrides. /// @{ virtual bool IsValidConfig() const OVERRIDE; virtual std::string ToString() const OVERRIDE; /// @} AudioCodec codec() const { return codec_; } uint8 sample_bits() const { return sample_bits_; } uint8 sample_bytes() const { return sample_bits_ / 8; } uint8 num_channels() const { return num_channels_; } uint32 sampling_frequency() const { return sampling_frequency_; } uint32 bytes_per_frame() const { return static_cast(num_channels_) * sample_bits_ / 8; } /// @param audio_object_type is only used by AAC Codec, ignored otherwise. /// @return The codec string. static std::string GetCodecString(AudioCodec codec, uint8 audio_object_type); private: virtual ~AudioStreamInfo(); AudioCodec codec_; uint8 sample_bits_; uint8 num_channels_; uint32 sampling_frequency_; // Not using DISALLOW_COPY_AND_ASSIGN here intentionally to allow the compiler // generated copy constructor and assignment operator. Since the extra data is // typically small, the performance impact is minimal. }; } // namespace media #endif // MEDIA_BASE_AUDIO_STREAM_INFO_H_