media/filters/opus_audio_decoder.h

   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/time/time.h"
  10 #include "media/base/audio_decoder.h"
  11 #include "media/base/demuxer_stream.h"
  12 #include "media/base/sample_format.h"
  13
  14 struct OpusMSDecoder;
  15
  16 namespace base {
  17 class SingleThreadTaskRunner;
  18 }
  19
  20 namespace media {
  21
  22 class AudioBuffer;
  23 class AudioDiscardHelper;
  24 class DecoderBuffer;
  25 struct QueuedAudioBuffer;
  26
  27 class MEDIA_EXPORT OpusAudioDecoder : public AudioDecoder {
  28  public:
  29   explicit OpusAudioDecoder(
  30       const scoped_refptr<base::SingleThreadTaskRunner>& task_runner);
  31   virtual ~OpusAudioDecoder();
  32
  33   // AudioDecoder implementation.
  34   virtual void Initialize(const AudioDecoderConfig& config,
  35                           const PipelineStatusCB& status_cb,
  36                           const OutputCB& output_cb) OVERRIDE;
  37   virtual void Decode(const scoped_refptr<DecoderBuffer>& buffer,
  38                       const DecodeCB& decode_cb) OVERRIDE;
  39   virtual void Reset(const base::Closure& closure) OVERRIDE;
  40   virtual void Stop() OVERRIDE;
  41
  42  private:
  43   // Reads from the demuxer stream with corresponding callback method.
  44   void ReadFromDemuxerStream();
  45   void DecodeBuffer(const scoped_refptr<DecoderBuffer>& input,
  46                     const DecodeCB& decode_cb);
  47
  48   bool ConfigureDecoder();
  49   void CloseDecoder();
  50   void ResetTimestampState();
  51   bool Decode(const scoped_refptr<DecoderBuffer>& input,
  52               scoped_refptr<AudioBuffer>* output_buffer);
  53
  54   scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
  55
  56   AudioDecoderConfig config_;
  57   OutputCB output_cb_;
  58   OpusMSDecoder* opus_decoder_;
  59
  60   // When the input timestamp is |start_input_timestamp_| the decoder needs to
  61   // drop |config_.codec_delay()| frames.
  62   base::TimeDelta start_input_timestamp_;
  63
  64   scoped_ptr<AudioDiscardHelper> discard_helper_;
  65
  66   DISALLOW_IMPLICIT_CONSTRUCTORS(OpusAudioDecoder);
  67 };
  68
  69 }  // namespace media
  70
  71 #endif  // MEDIA_FILTERS_OPUS_AUDIO_DECODER_H_