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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"
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <log/log.h>
#include <cutils/str_parms.h>
#include "ext_pcm.h"
static pthread_mutex_t ext_pcm_init_lock = PTHREAD_MUTEX_INITIALIZER;
static struct ext_pcm *shared_ext_pcm = NULL;
// Sleep 10ms between each mixing, this interval value is arbitrary chosen
#define MIXER_INTERVAL_MS 10
#define MAX(a, b) (((a) > (b)) ? (a) : (b))
#define MIN(a, b) (((a) < (b)) ? (a) : (b))
/* copied from libcutils/str_parms.c */
static bool str_eq(void *key_a, void *key_b) {
return !strcmp((const char *)key_a, (const char *)key_b);
}
/**
* use djb hash unless we find it inadequate.
* copied from libcutils/str_parms.c
*/
#ifdef __clang__
__attribute__((no_sanitize("integer")))
#endif
static int str_hash_fn(void *str) {
uint32_t hash = 5381;
char *p;
for (p = str; p && *p; p++) {
hash = ((hash << 5) + hash) + *p;
}
return (int)hash;
}
static bool mixer_thread_mix(__unused void *key, void *value, void *context) {
struct ext_mixer_pipeline *pipeline_out = (struct ext_mixer_pipeline *)context;
struct ext_mixer_pipeline *pipeline_in = (struct ext_mixer_pipeline *)value;
pipeline_out->position = MAX(pipeline_out->position, pipeline_in->position);
for (int i = 0; i < pipeline_out->position; i++) {
float mixed = pipeline_out->buffer[i] + pipeline_in->buffer[i];
if (mixed > INT16_MAX) pipeline_out->buffer[i] = INT16_MAX;
else if (mixed < INT16_MIN) pipeline_out->buffer[i] = INT16_MIN;
else pipeline_out->buffer[i] = (int16_t)mixed;
}
memset(pipeline_in, 0, sizeof(struct ext_mixer_pipeline));
return true;
}
static void *mixer_thread_loop(void *context) {
ALOGD("%s: __enter__", __func__);
struct ext_pcm *ext_pcm = (struct ext_pcm *)context;
do {
pthread_mutex_lock(&ext_pcm->mixer_lock);
ext_pcm->mixer_pipeline.position = 0;
// Combine the output from every pipeline into one output buffer
hashmapForEach(ext_pcm->mixer_pipeline_map, mixer_thread_mix,
&ext_pcm->mixer_pipeline);
if (ext_pcm->mixer_pipeline.position > 0) {
pcm_write(ext_pcm->pcm, (void *)ext_pcm->mixer_pipeline.buffer,
ext_pcm->mixer_pipeline.position * sizeof(int16_t));
}
memset(&ext_pcm->mixer_pipeline, 0, sizeof(struct ext_mixer_pipeline));
pthread_mutex_unlock(&ext_pcm->mixer_lock);
usleep(MIXER_INTERVAL_MS * 1000);
} while (1);
}
static int mixer_pipeline_write(struct ext_pcm *ext_pcm, const char *bus_address,
const void *data, unsigned int count) {
pthread_mutex_lock(&ext_pcm->mixer_lock);
struct ext_mixer_pipeline *pipeline = hashmapGet(
ext_pcm->mixer_pipeline_map, bus_address);
if (!pipeline) {
pipeline = calloc(1, sizeof(struct ext_mixer_pipeline));
hashmapPut(ext_pcm->mixer_pipeline_map, bus_address, pipeline);
}
unsigned int byteCount = MIN(count,
(MIXER_BUFFER_SIZE - pipeline->position) * sizeof(int16_t));
unsigned int int16Count = byteCount / sizeof(int16_t);
if (int16Count > 0) {
memcpy(&pipeline->buffer[pipeline->position], data, byteCount);
pipeline->position += int16Count;
}
pthread_mutex_unlock(&ext_pcm->mixer_lock);
return 0;
}
struct ext_pcm *ext_pcm_open(unsigned int card, unsigned int device,
unsigned int flags, struct pcm_config *config) {
pthread_mutex_lock(&ext_pcm_init_lock);
if (shared_ext_pcm == NULL) {
shared_ext_pcm = calloc(1, sizeof(struct ext_pcm));
pthread_mutex_init(&shared_ext_pcm->lock, (const pthread_mutexattr_t *) NULL);
shared_ext_pcm->pcm = pcm_open(card, device, flags, config);
pthread_mutex_init(&shared_ext_pcm->mixer_lock, (const pthread_mutexattr_t *)NULL);
pthread_create(&shared_ext_pcm->mixer_thread, (const pthread_attr_t *)NULL,
mixer_thread_loop, shared_ext_pcm);
shared_ext_pcm->mixer_pipeline_map = hashmapCreate(8, str_hash_fn, str_eq);
}
pthread_mutex_unlock(&ext_pcm_init_lock);
pthread_mutex_lock(&shared_ext_pcm->lock);
shared_ext_pcm->ref_count += 1;
pthread_mutex_unlock(&shared_ext_pcm->lock);
return shared_ext_pcm;
}
static bool mixer_free_pipeline(__unused void *key, void *value, void *context) {
struct ext_mixer_pipeline *pipeline = (struct ext_mixer_pipeline *)value;
free(pipeline);
return true;
}
int ext_pcm_close(struct ext_pcm *ext_pcm) {
if (ext_pcm == NULL || ext_pcm->pcm == NULL) {
return -EINVAL;
}
pthread_mutex_lock(&ext_pcm->lock);
ext_pcm->ref_count -= 1;
pthread_mutex_unlock(&ext_pcm->lock);
pthread_mutex_lock(&ext_pcm_init_lock);
if (ext_pcm->ref_count <= 0) {
pthread_mutex_destroy(&ext_pcm->lock);
pcm_close(ext_pcm->pcm);
pthread_mutex_destroy(&ext_pcm->mixer_lock);
hashmapForEach(ext_pcm->mixer_pipeline_map, mixer_free_pipeline,
(void *)NULL);
hashmapFree(ext_pcm->mixer_pipeline_map);
pthread_kill(ext_pcm->mixer_thread, SIGINT);
free(ext_pcm);
shared_ext_pcm = NULL;
}
pthread_mutex_unlock(&ext_pcm_init_lock);
return 0;
}
int ext_pcm_is_ready(struct ext_pcm *ext_pcm) {
if (ext_pcm == NULL || ext_pcm->pcm == NULL) {
return 0;
}
return pcm_is_ready(ext_pcm->pcm);
}
int ext_pcm_write(struct ext_pcm *ext_pcm, const char *address,
const void *data, unsigned int count) {
if (ext_pcm == NULL || ext_pcm->pcm == NULL) {
return -EINVAL;
}
return mixer_pipeline_write(ext_pcm, address, data, count);
}
const char *ext_pcm_get_error(struct ext_pcm *ext_pcm) {
if (ext_pcm == NULL || ext_pcm->pcm == NULL) {
return NULL;
}
return pcm_get_error(ext_pcm->pcm);
}
unsigned int ext_pcm_frames_to_bytes(struct ext_pcm *ext_pcm,
unsigned int frames) {
if (ext_pcm == NULL || ext_pcm->pcm == NULL) {
return -EINVAL;
}
return pcm_frames_to_bytes(ext_pcm->pcm, frames);
}
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