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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.
*/
#ifndef EXT_PCM_H
#define EXT_PCM_H
#include <pthread.h>
#include <cutils/hashmap.h>
#include <tinyalsa/asoundlib.h>
// Holds up to 4KB buffer for each mixer pipeline, this value is arbitrary chosen
#define MIXER_BUFFER_SIZE (1024 * 4)
struct ext_mixer_pipeline {
int16_t buffer[MIXER_BUFFER_SIZE];
unsigned int position;
};
struct ext_pcm {
struct pcm *pcm;
pthread_mutex_t lock;
unsigned int ref_count;
pthread_mutex_t mixer_lock;
struct ext_mixer_pipeline mixer_pipeline;
pthread_t mixer_thread;
Hashmap *mixer_pipeline_map;
};
struct ext_pcm *ext_pcm_open(unsigned int card, unsigned int device,
unsigned int flags, struct pcm_config *config);
int ext_pcm_close(struct ext_pcm *ext_pcm);
int ext_pcm_is_ready(struct ext_pcm *ext_pcm);
int ext_pcm_write(struct ext_pcm *ext_pcm, const char *bus_address,
const void *data, unsigned int count);
const char *ext_pcm_get_error(struct ext_pcm *ext_pcm);
unsigned int ext_pcm_frames_to_bytes(struct ext_pcm *ext_pcm,
unsigned int frames);
#endif // EXT_PCM_H
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