153 lines
4.1 KiB
C
153 lines
4.1 KiB
C
/*
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* Copyright (C) 2014 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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#define LOG_TAG "alsa_device_proxy"
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/*#define LOG_NDEBUG 0*/
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/*#define LOG_PCM_PARAMS 0*/
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#include <log/log.h>
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#include "alsa_device_proxy.h"
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#include "audio_logging.h"
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#define DEFAULT_PERIOD_SIZE 1024
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#define DEFAULT_PERIOD_COUNT 2
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void proxy_prepare(alsa_device_proxy * proxy, alsa_device_profile* profile,
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struct pcm_config * config)
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{
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ALOGV("proxy_prepare()");
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proxy->profile = profile;
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#ifdef LOG_PCM_PARAMS
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log_pcm_config(config, "proxy_setup()");
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#endif
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proxy->alsa_config.format =
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config->format != PCM_FORMAT_INVALID && profile_is_format_valid(profile, config->format)
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? config->format : profile->default_config.format;
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proxy->alsa_config.rate =
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config->rate != 0 && profile_is_sample_rate_valid(profile, config->rate)
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? config->rate : profile->default_config.rate;
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proxy->alsa_config.channels =
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config->channels != 0 && profile_is_channel_count_valid(profile, config->channels)
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? config->channels : profile->default_config.channels;
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proxy->alsa_config.period_count = profile->default_config.period_count;
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proxy->alsa_config.period_size =
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profile_get_period_size(proxy->profile, proxy->alsa_config.rate);
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// Hack for USB accessory audio.
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// Here we set the correct value for period_count if tinyalsa fails to get it from the
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// f_audio_source driver.
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if (proxy->alsa_config.period_count == 0) {
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proxy->alsa_config.period_count = 4;
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}
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proxy->pcm = NULL;
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}
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int proxy_open(alsa_device_proxy * proxy)
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{
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alsa_device_profile* profile = proxy->profile;
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ALOGV("proxy_open(card:%d device:%d %s)", profile->card, profile->device,
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profile->direction == PCM_OUT ? "PCM_OUT" : "PCM_IN");
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proxy->pcm = pcm_open(profile->card, profile->device, profile->direction, &proxy->alsa_config);
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if (proxy->pcm == NULL) {
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return -ENOMEM;
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}
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if (!pcm_is_ready(proxy->pcm)) {
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ALOGE("[%s] proxy_open() pcm_open() failed: %s", LOG_TAG, pcm_get_error(proxy->pcm));
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#ifdef LOG_PCM_PARAMS
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log_pcm_config(&proxy->alsa_config, "config");
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#endif
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pcm_close(proxy->pcm);
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proxy->pcm = NULL;
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return -ENOMEM;
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}
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return 0;
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}
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void proxy_close(alsa_device_proxy * proxy)
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{
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ALOGV("proxy_close() [pcm:%p]", proxy->pcm);
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if (proxy->pcm != NULL) {
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pcm_close(proxy->pcm);
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proxy->pcm = NULL;
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}
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}
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/*
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* Sample Rate
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*/
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unsigned proxy_get_sample_rate(const alsa_device_proxy * proxy)
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{
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return proxy->alsa_config.rate;
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}
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/*
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* Format
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*/
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enum pcm_format proxy_get_format(const alsa_device_proxy * proxy)
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{
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return proxy->alsa_config.format;
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}
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/*
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* Channel Count
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*/
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unsigned proxy_get_channel_count(const alsa_device_proxy * proxy)
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{
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return proxy->alsa_config.channels;
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}
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/*
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* Other
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*/
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unsigned int proxy_get_period_size(const alsa_device_proxy * proxy)
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{
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return proxy->alsa_config.period_size;
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}
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unsigned int proxy_get_period_count(const alsa_device_proxy * proxy)
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{
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return proxy->alsa_config.period_count;
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}
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unsigned proxy_get_latency(const alsa_device_proxy * proxy)
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{
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return (proxy_get_period_size(proxy) * proxy_get_period_count(proxy) * 1000)
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/ proxy_get_sample_rate(proxy);
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}
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/*
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* I/O
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*/
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int proxy_write(const alsa_device_proxy * proxy, const void *data, unsigned int count)
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{
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return pcm_write(proxy->pcm, data, count);
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}
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int proxy_read(const alsa_device_proxy * proxy, void *data, unsigned int count)
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{
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return pcm_read(proxy->pcm, data, count);
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}
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