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/* Copyright 2018 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef FLOAT_BUFFER_H_
#define FLOAT_BUFFER_H_
#include "byte_buffer.h"
/*
* Circular buffer storing deinterleaved floating point data.
* Members:
* fp - Pointer to be filled wtih read/write position of the buffer.
* num_channels - Number of channels.
*/
struct float_buffer {
struct byte_buffer *buf;
float **fp;
unsigned int num_channels;
};
/*
* Creates an float_buffer.
* Args:
* max_size - The max number of frames this buffer may store.
* num_channels - Number of channels of the deinterleaved data.
*/
static inline struct float_buffer *
float_buffer_create(unsigned int max_size, unsigned int num_channels)
{
struct float_buffer *b;
b = (struct float_buffer *)calloc(1, sizeof(*b));
b->num_channels = num_channels;
b->fp = (float **)malloc(num_channels * sizeof(float *));
b->buf = (struct byte_buffer *)calloc(
1, sizeof(struct byte_buffer) +
sizeof(float) * max_size * num_channels);
b->buf->max_size = max_size;
b->buf->used_size = max_size;
return b;
}
/* Destroys the float buffer. */
static inline void float_buffer_destroy(struct float_buffer **b)
{
if (*b == NULL)
return;
byte_buffer_destroy(&(*b)->buf);
free((*b)->fp);
free(*b);
*b = NULL;
}
/* Gets the write pointer of given float_buffer. */
static inline float *const *float_buffer_write_pointer(struct float_buffer *b)
{
unsigned int i;
float *data = (float *)b->buf->bytes;
for (i = 0; i < b->num_channels; i++, data += b->buf->max_size)
b->fp[i] = data + b->buf->write_idx;
return b->fp;
}
/* Gets the number of frames can write to the float_buffer. */
static inline unsigned int float_buffer_writable(struct float_buffer *b)
{
return buf_writable(b->buf);
}
/* Marks |nwritten| of frames as written to float_buffer. */
static inline void float_buffer_written(struct float_buffer *b,
unsigned int nwritten)
{
buf_increment_write(b->buf, nwritten);
}
/* Gets the read pointer of given float_buffer. */
static inline float *const *float_buffer_read_pointer(struct float_buffer *b,
unsigned int offset,
unsigned int *readable)
{
unsigned int i;
float *data = (float *)b->buf->bytes;
unsigned int nread = buf_readable(b->buf);
if (offset >= buf_queued(b->buf)) {
*readable = 0;
offset = 0;
} else if (offset >= nread) {
/* wraps */
offset = offset + b->buf->read_idx - b->buf->max_size;
*readable = MIN(*readable, b->buf->write_idx - offset);
} else {
*readable = MIN(*readable, nread - offset);
offset += b->buf->read_idx;
}
for (i = 0; i < b->num_channels; i++, data += b->buf->max_size)
b->fp[i] = data + offset;
return b->fp;
}
/* Gets the buffer level in frames queued in float_buffer. */
static inline unsigned int float_buffer_level(struct float_buffer *b)
{
return buf_queued(b->buf);
}
/* Resets float_buffer to initial state. */
static inline void float_buffer_reset(struct float_buffer *b)
{
buf_reset(b->buf);
}
/* Marks |nread| frames as read in float_buffer. */
static inline void float_buffer_read(struct float_buffer *b, unsigned int nread)
{
buf_increment_read(b->buf, nread);
}
#endif /* FLOAT_BUFFER_H_ */
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