mirror of
https://github.com/alsa-project/alsa-utils
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113 lines
2.8 KiB
C
113 lines
2.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
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//
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// frame-cache.c - maintainer of cache for data frame.
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//
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// Copyright (c) 2018 Takashi Sakamoto <o-takashi@sakamocchi.jp>
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//
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// Licensed under the terms of the GNU General Public License, version 2.
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#include "frame-cache.h"
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static void align_frames_in_i(struct frame_cache *cache,
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unsigned int consumed_count)
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{
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char *buf = cache->buf;
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unsigned int offset;
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unsigned int size;
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cache->remained_count -= consumed_count;
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offset = cache->bytes_per_sample * cache->samples_per_frame *
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consumed_count;
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size = cache->bytes_per_sample * cache->samples_per_frame *
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cache->remained_count;
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memmove(buf, buf + offset, size);
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cache->buf_ptr = buf + size;
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}
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static void align_frames_in_n(struct frame_cache *cache,
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unsigned int consumed_count)
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{
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char **bufs = cache->buf;
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char **buf_ptrs = cache->buf_ptr;
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unsigned int offset;
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unsigned int size;
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unsigned int i;
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cache->remained_count -= consumed_count;
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for (i = 0; i < cache->samples_per_frame; ++i) {
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offset = cache->bytes_per_sample * consumed_count;
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size = cache->bytes_per_sample * cache->remained_count;
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memmove(bufs[i], bufs[i] + offset, size);
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buf_ptrs[i] = bufs[i] + size;
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}
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}
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int frame_cache_init(struct frame_cache *cache, snd_pcm_access_t access,
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unsigned int bytes_per_sample,
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unsigned int samples_per_frame,
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unsigned int frames_per_cache)
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{
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cache->access = access;
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cache->remained_count = 0;
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cache->bytes_per_sample = bytes_per_sample;
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cache->samples_per_frame = samples_per_frame;
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cache->frames_per_cache = frames_per_cache;
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if (access == SND_PCM_ACCESS_RW_INTERLEAVED)
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cache->align_frames = align_frames_in_i;
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else if (access == SND_PCM_ACCESS_RW_NONINTERLEAVED)
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cache->align_frames = align_frames_in_n;
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else
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return -EINVAL;
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if (access == SND_PCM_ACCESS_RW_INTERLEAVED) {
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char *buf;
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buf = calloc(frames_per_cache,
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bytes_per_sample * samples_per_frame);
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if (buf == NULL)
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goto nomem;
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cache->buf = buf;
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cache->buf_ptr = buf;
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} else {
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char **bufs = calloc(samples_per_frame, sizeof(*bufs));
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char **buf_ptrs = calloc(samples_per_frame, sizeof(*buf_ptrs));
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unsigned int i;
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cache->buf = bufs;
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cache->buf_ptr = buf_ptrs;
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if (bufs == NULL || buf_ptrs == NULL)
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goto nomem;
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for (i = 0; i < samples_per_frame; ++i) {
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bufs[i] = calloc(frames_per_cache, bytes_per_sample);
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if (bufs[i] == NULL)
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goto nomem;
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buf_ptrs[i] = bufs[i];
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}
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}
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return 0;
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nomem:
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frame_cache_destroy(cache);
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return -ENOMEM;
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}
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void frame_cache_destroy(struct frame_cache *cache)
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{
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if (cache->access == SND_PCM_ACCESS_RW_NONINTERLEAVED) {
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char **bufs = cache->buf;
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if (bufs) {
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unsigned int i;
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for (i = 0; i < cache->samples_per_frame; ++i)
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free(bufs[i]);
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}
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free(cache->buf_ptr);
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}
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free(cache->buf);
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memset(cache, 0, sizeof(*cache));
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}
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