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/*
* 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.
*/
/*
* Provides a generic ring buffer that can be written to and read from with
* arbitrarily sized blocks. The AEC uses this for several different tasks.
*/
#include <stdlib.h>
#include <string.h>
#include "ring_buffer.h"
typedef struct {
int readPos;
int writePos;
int size;
char rwWrap;
bufdata_t *data;
} buf_t;
enum {SAME_WRAP, DIFF_WRAP};
int WebRtcApm_CreateBuffer(void **bufInst, int size)
{
buf_t *buf = NULL;
if (size < 0) {
return -1;
}
buf = malloc(sizeof(buf_t));
*bufInst = buf;
if (buf == NULL) {
return -1;
}
buf->data = malloc(size*sizeof(bufdata_t));
if (buf->data == NULL) {
free(buf);
buf = NULL;
return -1;
}
buf->size = size;
return 0;
}
int WebRtcApm_InitBuffer(void *bufInst)
{
buf_t *buf = (buf_t*)bufInst;
buf->readPos = 0;
buf->writePos = 0;
buf->rwWrap = SAME_WRAP;
// Initialize buffer to zeros
memset(buf->data, 0, sizeof(bufdata_t)*buf->size);
return 0;
}
int WebRtcApm_FreeBuffer(void *bufInst)
{
buf_t *buf = (buf_t*)bufInst;
if (buf == NULL) {
return -1;
}
free(buf->data);
free(buf);
return 0;
}
int WebRtcApm_ReadBuffer(void *bufInst, bufdata_t *data, int size)
{
buf_t *buf = (buf_t*)bufInst;
int n = 0, margin = 0;
if (size <= 0 || size > buf->size) {
return -1;
}
n = size;
if (buf->rwWrap == DIFF_WRAP) {
margin = buf->size - buf->readPos;
if (n > margin) {
buf->rwWrap = SAME_WRAP;
memcpy(data, buf->data + buf->readPos,
sizeof(bufdata_t)*margin);
buf->readPos = 0;
n = size - margin;
}
else {
memcpy(data, buf->data + buf->readPos,
sizeof(bufdata_t)*n);
buf->readPos += n;
return n;
}
}
if (buf->rwWrap == SAME_WRAP) {
margin = buf->writePos - buf->readPos;
if (margin > n)
margin = n;
memcpy(data + size - n, buf->data + buf->readPos,
sizeof(bufdata_t)*margin);
buf->readPos += margin;
n -= margin;
}
return size - n;
}
int WebRtcApm_WriteBuffer(void *bufInst, const bufdata_t *data, int size)
{
buf_t *buf = (buf_t*)bufInst;
int n = 0, margin = 0;
if (size < 0 || size > buf->size) {
return -1;
}
n = size;
if (buf->rwWrap == SAME_WRAP) {
margin = buf->size - buf->writePos;
if (n > margin) {
buf->rwWrap = DIFF_WRAP;
memcpy(buf->data + buf->writePos, data,
sizeof(bufdata_t)*margin);
buf->writePos = 0;
n = size - margin;
}
else {
memcpy(buf->data + buf->writePos, data,
sizeof(bufdata_t)*n);
buf->writePos += n;
return n;
}
}
if (buf->rwWrap == DIFF_WRAP) {
margin = buf->readPos - buf->writePos;
if (margin > n)
margin = n;
memcpy(buf->data + buf->writePos, data + size - n,
sizeof(bufdata_t)*margin);
buf->writePos += margin;
n -= margin;
}
return size - n;
}
int WebRtcApm_FlushBuffer(void *bufInst, int size)
{
buf_t *buf = (buf_t*)bufInst;
int n = 0, margin = 0;
if (size <= 0 || size > buf->size) {
return -1;
}
n = size;
if (buf->rwWrap == DIFF_WRAP) {
margin = buf->size - buf->readPos;
if (n > margin) {
buf->rwWrap = SAME_WRAP;
buf->readPos = 0;
n = size - margin;
}
else {
buf->readPos += n;
return n;
}
}
if (buf->rwWrap == SAME_WRAP) {
margin = buf->writePos - buf->readPos;
if (margin > n)
margin = n;
buf->readPos += margin;
n -= margin;
}
return size - n;
}
int WebRtcApm_StuffBuffer(void *bufInst, int size)
{
buf_t *buf = (buf_t*)bufInst;
int n = 0, margin = 0;
if (size <= 0 || size > buf->size) {
return -1;
}
n = size;
if (buf->rwWrap == SAME_WRAP) {
margin = buf->readPos;
if (n > margin) {
buf->rwWrap = DIFF_WRAP;
buf->readPos = buf->size - 1;
n -= margin + 1;
}
else {
buf->readPos -= n;
return n;
}
}
if (buf->rwWrap == DIFF_WRAP) {
margin = buf->readPos - buf->writePos;
if (margin > n)
margin = n;
buf->readPos -= margin;
n -= margin;
}
return size - n;
}
int WebRtcApm_get_buffer_size(const void *bufInst)
{
const buf_t *buf = (buf_t*)bufInst;
if (buf->rwWrap == SAME_WRAP)
return buf->writePos - buf->readPos;
else
return buf->size - buf->readPos + buf->writePos;
}
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