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| 1 /* |
| 2 * Copyright (c) 2015 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 #ifndef WEBRTC_COMMON_AUDIO_AUDIO_RING_BUFFER_H_ |
| 11 #define WEBRTC_COMMON_AUDIO_AUDIO_RING_BUFFER_H_ |
| 12 |
| 13 #include <stddef.h> |
| 14 #include <vector> |
| 15 |
| 16 struct RingBuffer; |
| 17 |
| 18 namespace webrtc { |
| 19 |
| 20 // A ring buffer tailored for float deinterleaved audio. Any operation that |
| 21 // cannot be performed as requested will cause a crash (e.g. insufficient data |
| 22 // in the buffer to fulfill a read request.) |
| 23 class AudioRingBuffer final { |
| 24 public: |
| 25 // Specify the number of channels and maximum number of frames the buffer will |
| 26 // contain. |
| 27 AudioRingBuffer(size_t channels, size_t max_frames); |
| 28 ~AudioRingBuffer(); |
| 29 |
| 30 // Copies |data| to the buffer and advances the write pointer. |channels| must |
| 31 // be the same as at creation time. |
| 32 void Write(const float* const* data, size_t channels, size_t frames); |
| 33 |
| 34 // Copies from the buffer to |data| and advances the read pointer. |channels| |
| 35 // must be the same as at creation time. |
| 36 void Read(float* const* data, size_t channels, size_t frames); |
| 37 |
| 38 size_t ReadFramesAvailable() const; |
| 39 size_t WriteFramesAvailable() const; |
| 40 |
| 41 // Moves the read position. The forward version advances the read pointer |
| 42 // towards the write pointer and the backward verison withdraws the read |
| 43 // pointer away from the write pointer (i.e. flushing and stuffing the buffer |
| 44 // respectively.) |
| 45 void MoveReadPositionForward(size_t frames); |
| 46 void MoveReadPositionBackward(size_t frames); |
| 47 |
| 48 private: |
| 49 // TODO(kwiberg): Use std::vector<std::unique_ptr<RingBuffer>> instead. |
| 50 std::vector<RingBuffer*> buffers_; |
| 51 }; |
| 52 |
| 53 } // namespace webrtc |
| 54 |
| 55 #endif // WEBRTC_COMMON_AUDIO_AUDIO_RING_BUFFER_H_ |
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