1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef MEDIA_FILTERS_OPUS_AUDIO_DECODER_H_ 6 #define MEDIA_FILTERS_OPUS_AUDIO_DECODER_H_ 7 8 #include "base/callback.h" 9 #include "base/memory/weak_ptr.h" 10 #include "base/time/time.h" 11 #include "media/base/audio_decoder.h" 12 #include "media/base/demuxer_stream.h" 13 14 struct OpusMSDecoder; 15 16 namespace base { 17 class MessageLoopProxy; 18 } 19 20 namespace media { 21 22 class AudioBuffer; 23 class AudioTimestampHelper; 24 class DecoderBuffer; 25 struct QueuedAudioBuffer; 26 27 class MEDIA_EXPORT OpusAudioDecoder : public AudioDecoder { 28 public: 29 explicit OpusAudioDecoder( 30 const scoped_refptr<base::MessageLoopProxy>& message_loop); 31 virtual ~OpusAudioDecoder(); 32 33 // AudioDecoder implementation. 34 virtual void Initialize(DemuxerStream* stream, 35 const PipelineStatusCB& status_cb, 36 const StatisticsCB& statistics_cb) OVERRIDE; 37 virtual void Read(const ReadCB& read_cb) OVERRIDE; 38 virtual int bits_per_channel() OVERRIDE; 39 virtual ChannelLayout channel_layout() OVERRIDE; 40 virtual int samples_per_second() OVERRIDE; 41 virtual void Reset(const base::Closure& closure) OVERRIDE; 42 43 private: 44 // Reads from the demuxer stream with corresponding callback method. 45 void ReadFromDemuxerStream(); 46 void BufferReady(DemuxerStream::Status status, 47 const scoped_refptr<DecoderBuffer>& input); 48 49 50 bool ConfigureDecoder(); 51 void CloseDecoder(); 52 void ResetTimestampState(); 53 bool Decode(const scoped_refptr<DecoderBuffer>& input, 54 scoped_refptr<AudioBuffer>* output_buffer); 55 56 scoped_refptr<base::MessageLoopProxy> message_loop_; 57 base::WeakPtrFactory<OpusAudioDecoder> weak_factory_; 58 base::WeakPtr<OpusAudioDecoder> weak_this_; 59 60 DemuxerStream* demuxer_stream_; 61 StatisticsCB statistics_cb_; 62 OpusMSDecoder* opus_decoder_; 63 64 // Decoded audio format. 65 int bits_per_channel_; 66 ChannelLayout channel_layout_; 67 int samples_per_second_; 68 69 // Used for computing output timestamps. 70 scoped_ptr<AudioTimestampHelper> output_timestamp_helper_; 71 base::TimeDelta last_input_timestamp_; 72 73 // Number of output sample bytes to drop before generating 74 // output buffers. 75 int output_bytes_to_drop_; 76 77 ReadCB read_cb_; 78 79 int skip_samples_; 80 81 // Buffer for output from libopus. 82 scoped_ptr<int16[]> output_buffer_; 83 84 DISALLOW_IMPLICIT_CONSTRUCTORS(OpusAudioDecoder); 85 }; 86 87 } // namespace media 88 89 #endif // MEDIA_FILTERS_OPUS_AUDIO_DECODER_H_ 90
