diff options
Diffstat (limited to 'third_party/webrtc/src/webrtc/common_audio/ring_buffer.h')
-rw-r--r-- | third_party/webrtc/src/webrtc/common_audio/ring_buffer.h | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/third_party/webrtc/src/webrtc/common_audio/ring_buffer.h b/third_party/webrtc/src/webrtc/common_audio/ring_buffer.h new file mode 100644 index 00000000..4125c48d --- /dev/null +++ b/third_party/webrtc/src/webrtc/common_audio/ring_buffer.h @@ -0,0 +1,66 @@ +/* + * Copyright (c) 2011 The WebRTC project authors. All Rights Reserved. + * + * Use of this source code is governed by a BSD-style license + * that can be found in the LICENSE file in the root of the source + * tree. An additional intellectual property rights grant can be found + * in the file PATENTS. All contributing project authors may + * be found in the AUTHORS file in the root of the source tree. + */ + +// A ring buffer to hold arbitrary data. Provides no thread safety. Unless +// otherwise specified, functions return 0 on success and -1 on error. + +#ifndef WEBRTC_COMMON_AUDIO_RING_BUFFER_H_ +#define WEBRTC_COMMON_AUDIO_RING_BUFFER_H_ + +#ifdef __cplusplus +extern "C" { +#endif + +#include <stddef.h> // size_t + +typedef struct RingBuffer RingBuffer; + +// Creates and initializes the buffer. Returns NULL on failure. +RingBuffer* WebRtc_CreateBuffer(size_t element_count, size_t element_size); +void WebRtc_InitBuffer(RingBuffer* handle); +void WebRtc_FreeBuffer(void* handle); + +// Reads data from the buffer. The |data_ptr| will point to the address where +// it is located. If all |element_count| data are feasible to read without +// buffer wrap around |data_ptr| will point to the location in the buffer. +// Otherwise, the data will be copied to |data| (memory allocation done by the +// user) and |data_ptr| points to the address of |data|. |data_ptr| is only +// guaranteed to be valid until the next call to WebRtc_WriteBuffer(). +// +// To force a copying to |data|, pass a NULL |data_ptr|. +// +// Returns number of elements read. +size_t WebRtc_ReadBuffer(RingBuffer* handle, + void** data_ptr, + void* data, + size_t element_count); + +// Writes |data| to buffer and returns the number of elements written. +size_t WebRtc_WriteBuffer(RingBuffer* handle, const void* data, + size_t element_count); + +// Moves the buffer read position and returns the number of elements moved. +// Positive |element_count| moves the read position towards the write position, +// that is, flushing the buffer. Negative |element_count| moves the read +// position away from the the write position, that is, stuffing the buffer. +// Returns number of elements moved. +int WebRtc_MoveReadPtr(RingBuffer* handle, int element_count); + +// Returns number of available elements to read. +size_t WebRtc_available_read(const RingBuffer* handle); + +// Returns number of available elements for write. +size_t WebRtc_available_write(const RingBuffer* handle); + +#ifdef __cplusplus +} +#endif + +#endif // WEBRTC_COMMON_AUDIO_RING_BUFFER_H_ |