mirror of
https://github.com/alsa-project/alsa-utils
synced 2024-11-10 00:15:43 +01:00
819e04c7a1
- container-voc.c - out of array access - container-voc.c - handle correctly eof - frame_cache.c - correct memory allocation - container.c - byte_count might be used uninitialized - xfer-libasound-irq-mmap.c - fix avail signess - xfer-options.c - fix potential 32-bit wrap for duration Signed-off-by: Jaroslav Kysela <perex@perex.cz>
113 lines
2.8 KiB
C
113 lines
2.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
//
|
|
// frame-cache.c - maintainer of cache for data frame.
|
|
//
|
|
// Copyright (c) 2018 Takashi Sakamoto <o-takashi@sakamocchi.jp>
|
|
//
|
|
// Licensed under the terms of the GNU General Public License, version 2.
|
|
|
|
#include "frame-cache.h"
|
|
|
|
static void align_frames_in_i(struct frame_cache *cache,
|
|
unsigned int consumed_count)
|
|
{
|
|
char *buf = cache->buf;
|
|
unsigned int offset;
|
|
unsigned int size;
|
|
|
|
cache->remained_count -= consumed_count;
|
|
|
|
offset = cache->bytes_per_sample * cache->samples_per_frame *
|
|
consumed_count;
|
|
size = cache->bytes_per_sample * cache->samples_per_frame *
|
|
cache->remained_count;
|
|
memmove(buf, buf + offset, size);
|
|
|
|
cache->buf_ptr = buf + size;
|
|
}
|
|
|
|
static void align_frames_in_n(struct frame_cache *cache,
|
|
unsigned int consumed_count)
|
|
{
|
|
char **bufs = cache->buf;
|
|
char **buf_ptrs = cache->buf_ptr;
|
|
unsigned int offset;
|
|
unsigned int size;
|
|
int i;
|
|
|
|
cache->remained_count -= consumed_count;
|
|
|
|
for (i = 0; i < cache->samples_per_frame; ++i) {
|
|
offset = cache->bytes_per_sample * consumed_count;
|
|
size = cache->bytes_per_sample * cache->remained_count;
|
|
memmove(bufs[i], bufs[i] + offset, size);
|
|
buf_ptrs[i] = bufs[i] + size;
|
|
}
|
|
}
|
|
|
|
int frame_cache_init(struct frame_cache *cache, snd_pcm_access_t access,
|
|
unsigned int bytes_per_sample,
|
|
unsigned int samples_per_frame,
|
|
unsigned int frames_per_cache)
|
|
{
|
|
cache->access = access;
|
|
cache->remained_count = 0;
|
|
cache->bytes_per_sample = bytes_per_sample;
|
|
cache->samples_per_frame = samples_per_frame;
|
|
cache->frames_per_cache = frames_per_cache;
|
|
|
|
if (access == SND_PCM_ACCESS_RW_INTERLEAVED)
|
|
cache->align_frames = align_frames_in_i;
|
|
else if (access == SND_PCM_ACCESS_RW_NONINTERLEAVED)
|
|
cache->align_frames = align_frames_in_n;
|
|
else
|
|
return -EINVAL;
|
|
|
|
if (access == SND_PCM_ACCESS_RW_INTERLEAVED) {
|
|
char *buf;
|
|
|
|
buf = calloc(frames_per_cache,
|
|
bytes_per_sample * samples_per_frame);
|
|
if (buf == NULL)
|
|
goto nomem;
|
|
cache->buf = buf;
|
|
cache->buf_ptr = buf;
|
|
} else {
|
|
char **bufs = calloc(samples_per_frame, sizeof(*bufs));
|
|
char **buf_ptrs = calloc(samples_per_frame, sizeof(*buf_ptrs));
|
|
int i;
|
|
|
|
cache->buf = bufs;
|
|
cache->buf_ptr = buf_ptrs;
|
|
if (bufs == NULL || buf_ptrs == NULL)
|
|
goto nomem;
|
|
for (i = 0; i < samples_per_frame; ++i) {
|
|
bufs[i] = calloc(frames_per_cache, bytes_per_sample);
|
|
if (bufs[i] == NULL)
|
|
goto nomem;
|
|
buf_ptrs[i] = bufs[i];
|
|
}
|
|
}
|
|
|
|
|
|
return 0;
|
|
|
|
nomem:
|
|
frame_cache_destroy(cache);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
void frame_cache_destroy(struct frame_cache *cache)
|
|
{
|
|
if (cache->access == SND_PCM_ACCESS_RW_NONINTERLEAVED) {
|
|
char **bufs = cache->buf;
|
|
if (bufs) {
|
|
int i;
|
|
for (i = 0; i < cache->samples_per_frame; ++i)
|
|
free(bufs[i]);
|
|
}
|
|
free(cache->buf_ptr);
|
|
}
|
|
free(cache->buf);
|
|
memset(cache, 0, sizeof(*cache));
|
|
}
|