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55 lines
1.7 KiB
55 lines
1.7 KiB
/*
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* Copyright (C) 2018 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef EXT_PCM_H
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#define EXT_PCM_H
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#include <pthread.h>
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#include <cutils/hashmap.h>
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#include <tinyalsa/asoundlib.h>
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// Holds up to 4KB buffer for each mixer pipeline, this value is arbitrary chosen
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#define MIXER_BUFFER_SIZE (1024 * 4)
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struct ext_mixer_pipeline {
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int16_t buffer[MIXER_BUFFER_SIZE];
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unsigned int position;
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};
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struct ext_pcm {
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struct pcm *pcm;
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pthread_mutex_t lock;
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unsigned int ref_count;
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pthread_mutex_t mixer_lock;
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pthread_cond_t mixer_wake;
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struct ext_mixer_pipeline mixer_pipeline;
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pthread_t mixer_thread;
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Hashmap *mixer_pipeline_map;
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};
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struct ext_pcm *ext_pcm_open(unsigned int card, unsigned int device,
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unsigned int flags, struct pcm_config *config);
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int ext_pcm_close(struct ext_pcm *ext_pcm);
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int ext_pcm_is_ready(struct ext_pcm *ext_pcm);
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int ext_pcm_write(struct ext_pcm *ext_pcm, const char *bus_address,
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const void *data, unsigned int count);
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const char *ext_pcm_get_error(struct ext_pcm *ext_pcm);
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unsigned int ext_pcm_frames_to_bytes(struct ext_pcm *ext_pcm,
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unsigned int frames);
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#endif // EXT_PCM_H
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