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/*
* This file is part of mpv.
*
* mpv is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* mpv is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with mpv. If not, see <http://www.gnu.org/licenses/>.
*/
#include <libavutil/fifo.h>
#include "talloc.h"
#include "ca_ringbuffer_internal.h"
struct ca_ringbuffer {
AVFifoBuffer *fifo;
int len;
int chunks;
int chunk_size;
};
struct ca_ringbuffer *ca_ringbuffer_new(void *talloc_ctx, int chunks, int chunk_size)
{
struct ca_ringbuffer *buffer =
talloc_zero(talloc_ctx, struct ca_ringbuffer);
*buffer = (struct ca_ringbuffer) {
.fifo = av_fifo_alloc(chunks * chunk_size),
.len = chunks * chunk_size,
.chunks = chunks,
.chunk_size = chunk_size,
};
return buffer;
}
struct ca_ringbuffer *ca_ringbuffer_new2(void *talloc_ctx, int bps, int chunk_size)
{
int chunks = (bps + chunk_size - 1) / chunk_size;
return ca_ringbuffer_new(talloc_ctx, chunks, chunk_size);
}
int ca_ringbuffer_read(struct ca_ringbuffer *buffer,
unsigned char *data, int len)
{
int buffered = ca_ringbuffer_buffered(buffer);
if (len > buffered)
len = buffered;
if (data)
av_fifo_generic_read(buffer->fifo, data, len, NULL);
else
av_fifo_drain(buffer->fifo, len);
return len;
}
int ca_ringbuffer_write(struct ca_ringbuffer *buffer,
unsigned char *data, int len)
{
int free = buffer->len - av_fifo_size(buffer->fifo);
if (len > free)
len = free;
return av_fifo_generic_write(buffer->fifo, data, len, NULL);
}
void ca_ringbuffer_reset(struct ca_ringbuffer *buffer)
{
av_fifo_reset(buffer->fifo);
}
int ca_ringbuffer_available(struct ca_ringbuffer *buffer)
{
return ca_ringbuffer_size(buffer) - ca_ringbuffer_buffered(buffer);
}
int ca_ringbuffer_size(struct ca_ringbuffer *buffer)
{
return buffer->len;
}
int ca_ringbuffer_buffered(struct ca_ringbuffer *buffer)
{
return av_fifo_size(buffer->fifo);
}
int ca_ringbuffer_chunk_size(struct ca_ringbuffer *buffer)
{
return buffer->chunk_size;
}
char *ca_ringbuffer_repr(struct ca_ringbuffer *buffer, void *talloc_ctx)
{
return talloc_asprintf(
talloc_ctx,
"Ringbuffer { .chunks = %d bytes, .chunk_size = %d bytes, .size = %d bytes }",
buffer->chunks,
ca_ringbuffer_chunk_size(buffer),
ca_ringbuffer_size(buffer));
}
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