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/*
* Copyright (C) 2018 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#define LOG_TAG "audio_hw_generic_caremu"
// #define LOG_NDEBUG 0
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <log/log.h>
#include "audio_vbuffer.h"
#define MIN(a, b) (((a) < (b)) ? (a) : (b))
int audio_vbuffer_init(audio_vbuffer_t *audio_vbuffer, size_t frame_count,
size_t frame_size) {
if (!audio_vbuffer) {
return -EINVAL;
}
audio_vbuffer->frame_size = frame_size;
audio_vbuffer->frame_count = frame_count;
size_t bytes = frame_count * frame_size;
audio_vbuffer->data = calloc(bytes, 1);
if (!audio_vbuffer->data) {
return -ENOMEM;
}
audio_vbuffer->head = 0;
audio_vbuffer->tail = 0;
audio_vbuffer->live = 0;
pthread_mutex_init(&audio_vbuffer->lock, (const pthread_mutexattr_t *)NULL);
return 0;
}
int audio_vbuffer_destroy(audio_vbuffer_t *audio_vbuffer) {
if (!audio_vbuffer) {
return -EINVAL;
}
free(audio_vbuffer->data);
pthread_mutex_destroy(&audio_vbuffer->lock);
return 0;
}
int audio_vbuffer_live(audio_vbuffer_t *audio_vbuffer) {
if (!audio_vbuffer) {
return -EINVAL;
}
pthread_mutex_lock(&audio_vbuffer->lock);
int live = audio_vbuffer->live;
pthread_mutex_unlock(&audio_vbuffer->lock);
return live;
}
int audio_vbuffer_dead(audio_vbuffer_t *audio_vbuffer) {
if (!audio_vbuffer) {
return -EINVAL;
}
pthread_mutex_lock(&audio_vbuffer->lock);
int dead = audio_vbuffer->frame_count - audio_vbuffer->live;
pthread_mutex_unlock(&audio_vbuffer->lock);
return dead;
}
size_t audio_vbuffer_write(audio_vbuffer_t *audio_vbuffer, const void *buffer,
size_t frame_count) {
size_t frames_written = 0;
pthread_mutex_lock(&audio_vbuffer->lock);
while (frame_count != 0) {
int frames = 0;
if (audio_vbuffer->live == 0 || audio_vbuffer->head > audio_vbuffer->tail) {
frames =
MIN(frame_count, audio_vbuffer->frame_count - audio_vbuffer->head);
} else if (audio_vbuffer->head < audio_vbuffer->tail) {
frames = MIN(frame_count, audio_vbuffer->tail - (audio_vbuffer->head));
} else {
ALOGD("%s audio_vbuffer is full", __func__);
break;
}
memcpy(
&audio_vbuffer->data[audio_vbuffer->head * audio_vbuffer->frame_size],
&((uint8_t *)buffer)[frames_written * audio_vbuffer->frame_size],
frames * audio_vbuffer->frame_size);
audio_vbuffer->live += frames;
frames_written += frames;
frame_count -= frames;
audio_vbuffer->head =
(audio_vbuffer->head + frames) % audio_vbuffer->frame_count;
}
pthread_mutex_unlock(&audio_vbuffer->lock);
return frames_written;
}
size_t audio_vbuffer_read(audio_vbuffer_t *audio_vbuffer, void *buffer,
size_t frame_count) {
size_t frames_read = 0;
pthread_mutex_lock(&audio_vbuffer->lock);
while (frame_count != 0) {
int frames = 0;
if (audio_vbuffer->live == audio_vbuffer->frame_count ||
audio_vbuffer->tail > audio_vbuffer->head) {
frames =
MIN(frame_count, audio_vbuffer->frame_count - audio_vbuffer->tail);
} else if (audio_vbuffer->tail < audio_vbuffer->head) {
frames = MIN(frame_count, audio_vbuffer->head - audio_vbuffer->tail);
} else {
break;
}
memcpy(
&((uint8_t *)buffer)[frames_read * audio_vbuffer->frame_size],
&audio_vbuffer->data[audio_vbuffer->tail * audio_vbuffer->frame_size],
frames * audio_vbuffer->frame_size);
audio_vbuffer->live -= frames;
frames_read += frames;
frame_count -= frames;
audio_vbuffer->tail =
(audio_vbuffer->tail + frames) % audio_vbuffer->frame_count;
}
pthread_mutex_unlock(&audio_vbuffer->lock);
return frames_read;
}
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