audio_source.h (1702B)
1 /* 2 * Copyright (c) 2013 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 MEDIA_BASE_AUDIO_SOURCE_H_ 12 #define MEDIA_BASE_AUDIO_SOURCE_H_ 13 14 #include <cstddef> 15 #include <cstdint> 16 #include <optional> 17 18 namespace webrtc { 19 20 // Abstract interface for providing the audio data. 21 // TODO(deadbeef): Rename this to AudioSourceInterface, and rename 22 // AudioSourceInterface to AudioTrackSourceInterface. 23 class AudioSource { 24 public: 25 class Sink { 26 public: 27 // Callback to receive data from the AudioSource. 28 virtual void OnData( 29 const void* audio_data, 30 int bits_per_sample, 31 int sample_rate, 32 size_t number_of_channels, 33 size_t number_of_frames, 34 std::optional<int64_t> absolute_capture_timestamp_ms) = 0; 35 36 // Called when the AudioSource is going away. 37 virtual void OnClose() = 0; 38 39 // Returns the number of channels encoded by the sink. This can be less than 40 // the number_of_channels if down-mixing occur. A value of -1 means an 41 // unknown number. 42 virtual int NumPreferredChannels() const = 0; 43 44 protected: 45 virtual ~Sink() {} 46 }; 47 48 // Sets a sink to the AudioSource. There can be only one sink connected 49 // to the source at a time. 50 virtual void SetSink(Sink* sink) = 0; 51 52 protected: 53 virtual ~AudioSource() {} 54 }; 55 56 } // namespace webrtc 57 58 59 #endif // MEDIA_BASE_AUDIO_SOURCE_H_