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1 /* | |
2 * Copyright (c) 2011 The WebRTC project authors. All Rights Reserved. | |
3 * | |
4 * Use of this source code is governed by a BSD-style license | |
5 * that can be found in the LICENSE file in the root of the source | |
6 * tree. An additional intellectual property rights grant can be found | |
7 * in the file PATENTS. All contributing project authors may | |
8 * be found in the AUTHORS file in the root of the source tree. | |
9 */ | |
10 | |
11 #ifndef WEBRTC_MODULES_AUDIO_MIXER_INCLUDE_AUDIO_MIXER_DEFINES_H_ | |
12 #define WEBRTC_MODULES_AUDIO_MIXER_INCLUDE_AUDIO_MIXER_DEFINES_H_ | |
13 | |
14 #include "webrtc/base/checks.h" | |
15 #include "webrtc/modules/include/module_common_types.h" | |
16 #include "webrtc/typedefs.h" | |
17 | |
18 namespace webrtc { | |
19 class NewMixHistory; | |
20 | |
21 // A callback class that all mixer participants must inherit from/implement. | |
22 class MixerAudioSource { | |
23 public: | |
24 enum class AudioFrameInfo { | |
25 kNormal, // The samples in audio_frame are valid and should be used. | |
26 kMuted, // The samples in audio_frame should not be used, but should be | |
27 // implicitly interpreted as zero. Other fields in audio_frame | |
28 // may be read and should contain meaningful values. | |
29 kError // audio_frame will not be used. | |
30 }; | |
31 | |
32 struct AudioFrameWithMuted { | |
33 AudioFrame* audio_frame; | |
34 AudioFrameInfo audio_frame_info; | |
35 }; | |
36 | |
37 // The implementation of GetAudioFrameWithMuted should update | |
38 // audio_frame with new audio every time it's called. Implementing | |
39 // classes are allowed to return the same AudioFrame pointer on | |
40 // different calls. The pointer must stay valid until the next | |
41 // mixing call or until this audio source is disconnected from the | |
42 // mixer. | |
43 virtual AudioFrameWithMuted GetAudioFrameWithMuted(int32_t id, | |
44 int sample_rate_hz) = 0; | |
45 | |
46 // Returns true if the participant was mixed this mix iteration. | |
47 bool IsMixed() const; | |
48 | |
49 NewMixHistory* _mixHistory; | |
50 | |
51 protected: | |
52 MixerAudioSource(); | |
53 virtual ~MixerAudioSource(); | |
54 }; | |
55 } // namespace webrtc | |
56 | |
57 #endif // WEBRTC_MODULES_AUDIO_MIXER_INCLUDE_AUDIO_MIXER_DEFINES_H_ | |
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