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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 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 | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef MEDIA_BASE_AUDIO_RENDERER_H_ | 5 #ifndef MEDIA_BASE_AUDIO_RENDERER_H_ |
6 #define MEDIA_BASE_AUDIO_RENDERER_H_ | 6 #define MEDIA_BASE_AUDIO_RENDERER_H_ |
7 | 7 |
8 #include "base/callback.h" | 8 #include "base/callback.h" |
9 #include "base/macros.h" | 9 #include "base/macros.h" |
10 #include "base/time/time.h" | 10 #include "base/time/time.h" |
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25 | 25 |
26 // Stop all operations and fire all pending callbacks. | 26 // Stop all operations and fire all pending callbacks. |
27 virtual ~AudioRenderer(); | 27 virtual ~AudioRenderer(); |
28 | 28 |
29 // Initialize an AudioRenderer with |stream|, executing |init_cb| upon | 29 // Initialize an AudioRenderer with |stream|, executing |init_cb| upon |
30 // completion. If initialization fails, only |init_cb| | 30 // completion. If initialization fails, only |init_cb| |
31 // (not RendererClient::OnError) will be called. | 31 // (not RendererClient::OnError) will be called. |
32 // | 32 // |
33 // |cdm_context| can be used to handle encrypted streams. May be null if the | 33 // |cdm_context| can be used to handle encrypted streams. May be null if the |
34 // stream is not encrypted. | 34 // stream is not encrypted. |
| 35 // |
| 36 // AudioRenderer may be reinitialized for playback of a different demuxer |
| 37 // stream by calling Initialize again when the renderer is in a flushed |
| 38 // state (i.e. after Flush call, but before StartPlaying). This is used for |
| 39 // media track switching. |
35 virtual void Initialize(DemuxerStream* stream, | 40 virtual void Initialize(DemuxerStream* stream, |
36 CdmContext* cdm_context, | 41 CdmContext* cdm_context, |
37 RendererClient* client, | 42 RendererClient* client, |
38 const PipelineStatusCB& init_cb) = 0; | 43 const PipelineStatusCB& init_cb) = 0; |
39 | 44 |
40 // Returns the TimeSource associated with audio rendering. | 45 // Returns the TimeSource associated with audio rendering. |
41 virtual TimeSource* GetTimeSource() = 0; | 46 virtual TimeSource* GetTimeSource() = 0; |
42 | 47 |
43 // Discard any audio data, executing |callback| when completed. | 48 // Discard any audio data, executing |callback| when completed. |
44 // | 49 // |
45 // Clients should expect |buffering_state_cb| to be called with | 50 // Clients should expect |buffering_state_cb| to be called with |
46 // BUFFERING_HAVE_NOTHING while flushing is in progress. | 51 // BUFFERING_HAVE_NOTHING while flushing is in progress. |
47 virtual void Flush(const base::Closure& callback) = 0; | 52 virtual void Flush(const base::Closure& callback) = 0; |
48 | 53 |
49 // Starts playback by reading from |stream| and decoding and rendering audio. | 54 // Starts playback by reading from |stream| and decoding and rendering audio. |
50 // | 55 // |
51 // Only valid to call after a successful Initialize() or Flush(). | 56 // Only valid to call after a successful Initialize() or Flush(). |
52 virtual void StartPlaying() = 0; | 57 virtual void StartPlaying() = 0; |
53 | 58 |
54 // Sets the output volume. | 59 // Sets the output volume. |
55 virtual void SetVolume(float volume) = 0; | 60 virtual void SetVolume(float volume) = 0; |
56 | 61 |
57 private: | 62 private: |
58 DISALLOW_COPY_AND_ASSIGN(AudioRenderer); | 63 DISALLOW_COPY_AND_ASSIGN(AudioRenderer); |
59 }; | 64 }; |
60 | 65 |
61 } // namespace media | 66 } // namespace media |
62 | 67 |
63 #endif // MEDIA_BASE_AUDIO_RENDERER_H_ | 68 #endif // MEDIA_BASE_AUDIO_RENDERER_H_ |
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