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| 1 /* | 1 /* |
| 2 * Copyright (c) 2011 The WebRTC project authors. All Rights Reserved. | 2 * Copyright (c) 2011 The WebRTC project authors. All Rights Reserved. |
| 3 * | 3 * |
| 4 * Use of this source code is governed by a BSD-style license | 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 | 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 | 6 * tree. An additional intellectual property rights grant can be found |
| 7 * in the file PATENTS. All contributing project authors may | 7 * in the file PATENTS. All contributing project authors may |
| 8 * be found in the AUTHORS file in the root of the source tree. | 8 * be found in the AUTHORS file in the root of the source tree. |
| 9 */ | 9 */ |
| 10 | 10 |
| 11 // A ring buffer to hold arbitrary data. Provides no thread safety. Unless | 11 // A ring buffer to hold arbitrary data. Provides no thread safety. Unless |
| 12 // otherwise specified, functions return 0 on success and -1 on error. | 12 // otherwise specified, functions return 0 on success and -1 on error. |
| 13 | 13 |
| 14 #include "webrtc/common_audio/ring_buffer.h" | 14 #include "webrtc/common_audio/ring_buffer.h" |
| 15 | 15 |
| 16 #include <stddef.h> // size_t | 16 #include <stddef.h> // size_t |
| 17 #include <stdlib.h> | 17 #include <stdlib.h> |
| 18 #include <string.h> | 18 #include <string.h> |
| 19 | 19 |
| 20 enum Wrap { | |
| 21 SAME_WRAP, | |
| 22 DIFF_WRAP | |
| 23 }; | |
| 24 | |
| 25 struct RingBuffer { | |
| 26 size_t read_pos; | |
| 27 size_t write_pos; | |
| 28 size_t element_count; | |
| 29 size_t element_size; | |
| 30 enum Wrap rw_wrap; | |
| 31 char* data; | |
| 32 }; | |
| 33 | |
| 34 // Get address of region(s) from which we can read data. | 20 // Get address of region(s) from which we can read data. |
| 35 // If the region is contiguous, |data_ptr_bytes_2| will be zero. | 21 // If the region is contiguous, |data_ptr_bytes_2| will be zero. |
| 36 // If non-contiguous, |data_ptr_bytes_2| will be the size in bytes of the second | 22 // If non-contiguous, |data_ptr_bytes_2| will be the size in bytes of the second |
| 37 // region. Returns room available to be read or |element_count|, whichever is | 23 // region. Returns room available to be read or |element_count|, whichever is |
| 38 // smaller. | 24 // smaller. |
| 39 static size_t GetBufferReadRegions(RingBuffer* buf, | 25 static size_t GetBufferReadRegions(RingBuffer* buf, |
| 40 size_t element_count, | 26 size_t element_count, |
| 41 void** data_ptr_1, | 27 void** data_ptr_1, |
| 42 size_t* data_ptr_bytes_1, | 28 size_t* data_ptr_bytes_1, |
| 43 void** data_ptr_2, | 29 void** data_ptr_2, |
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| 238 } | 224 } |
| 239 } | 225 } |
| 240 | 226 |
| 241 size_t WebRtc_available_write(const RingBuffer* self) { | 227 size_t WebRtc_available_write(const RingBuffer* self) { |
| 242 if (!self) { | 228 if (!self) { |
| 243 return 0; | 229 return 0; |
| 244 } | 230 } |
| 245 | 231 |
| 246 return self->element_count - WebRtc_available_read(self); | 232 return self->element_count - WebRtc_available_read(self); |
| 247 } | 233 } |
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