void proxy_prepare(alsa_device_proxy * proxy, alsa_device_profile* profile,
struct pcm_config * config)
{
ALOGV("proxy_prepare()");
proxy->profile = profile;
#ifdef LOG_PCM_PARAMS
log_pcm_config(config, "proxy_setup()");
#endif
proxy->alsa_config.format =
config->format != PCM_FORMAT_INVALID && profile_is_format_valid(profile, config->format)
? config->format : profile->default_config.format;
proxy->alsa_config.rate =
config->rate != 0 && profile_is_sample_rate_valid(profile, config->rate)
? config->rate : profile->default_config.rate;
proxy->alsa_config.channels =
config->channels != 0 && profile_is_channel_count_valid(profile, config->channels)
? config->channels : profile->default_config.channels;
proxy->alsa_config.period_count = profile->default_config.period_count;
proxy->alsa_config.period_size =
profile_get_period_size(proxy->profile, proxy->alsa_config.rate);
// Hack for USB accessory audio.
// Here we set the correct value for period_count if tinyalsa fails to get it from the
// f_audio_source driver.
if (proxy->alsa_config.period_count == 0) {
proxy->alsa_config.period_count = 4;
}
proxy->pcm = NULL;
}
int proxy_open(alsa_device_proxy * proxy)
{
alsa_device_profile* profile = proxy->profile;
ALOGV("proxy_open(card:%d device:%d %s)", profile->card, profile->device,
profile->direction == PCM_OUT ? "PCM_OUT" : "PCM_IN");
if (profile->card < 0 || profile->device < 0) {
return -EINVAL;
}
proxy->pcm = pcm_open(profile->card, profile->device,
profile->direction | PCM_MONOTONIC, &proxy->alsa_config);
if (proxy->pcm == NULL) {
return -ENOMEM;
}
if (!pcm_is_ready(proxy->pcm)) {
ALOGE(" proxy_open() pcm_open() failed: %s", pcm_get_error(proxy->pcm));
#if defined(LOG_PCM_PARAMS)
log_pcm_config(&proxy->alsa_config, "config");
#endif
pcm_close(proxy->pcm);
proxy->pcm = NULL;
return -ENOMEM;
}
return 0;
}
/*
* Reads and decodes configuration info from the specified ALSA card/device.
*/
static int read_alsa_device_config(alsa_device_profile * profile, struct pcm_config * config)
{
ALOGV("usb:audio_hw - read_alsa_device_config(c:%d d:%d t:0x%X)",
profile->card, profile->device, profile->direction);
if (profile->card < 0 || profile->device < 0) {
return -EINVAL;
}
struct pcm_params * alsa_hw_params =
pcm_params_get(profile->card, profile->device, profile->direction);
if (alsa_hw_params == NULL) {
return -EINVAL;
}
profile->min_period_size = pcm_params_get_min(alsa_hw_params, PCM_PARAM_PERIOD_SIZE);
profile->max_period_size = pcm_params_get_max(alsa_hw_params, PCM_PARAM_PERIOD_SIZE);
profile->min_channel_count = pcm_params_get_min(alsa_hw_params, PCM_PARAM_CHANNELS);
profile->max_channel_count = pcm_params_get_max(alsa_hw_params, PCM_PARAM_CHANNELS);
int ret = 0;
/*
* This Logging will be useful when testing new USB devices.
*/
#ifdef LOG_PCM_PARAMS
log_pcm_params(alsa_hw_params);
#endif
config->channels = pcm_params_get_min(alsa_hw_params, PCM_PARAM_CHANNELS);
config->rate = pcm_params_get_min(alsa_hw_params, PCM_PARAM_RATE);
config->period_size = profile_calc_min_period_size(profile, config->rate);
config->period_count = pcm_params_get_min(alsa_hw_params, PCM_PARAM_PERIODS);
config->format = get_pcm_format_for_mask(pcm_params_get_mask(alsa_hw_params, PCM_PARAM_FORMAT));
#ifdef LOG_PCM_PARAMS
log_pcm_config(config, "read_alsa_device_config");
#endif
if (config->format == PCM_FORMAT_INVALID) {
ret = -EINVAL;
}
pcm_params_free(alsa_hw_params);
return ret;
}
void proxy_prepare(alsa_device_proxy * proxy, alsa_device_profile* profile,
struct pcm_config * config)
{
ALOGV("proxy_prepare(c:%d, d:%d)", profile->card, profile->device);
proxy->profile = profile;
#ifdef LOG_PCM_PARAMS
log_pcm_config(config, "proxy_setup()");
#endif
proxy->alsa_config.format =
config->format != PCM_FORMAT_INVALID && profile_is_format_valid(profile, config->format)
? config->format : profile->default_config.format;
proxy->alsa_config.rate =
config->rate != 0 && profile_is_sample_rate_valid(profile, config->rate)
? config->rate : profile->default_config.rate;
proxy->alsa_config.channels =
config->channels != 0 && profile_is_channel_count_valid(profile, config->channels)
? config->channels : profile->default_config.channels;
proxy->alsa_config.period_count = profile->default_config.period_count;
proxy->alsa_config.period_size =
profile_get_period_size(proxy->profile, proxy->alsa_config.rate);
// Hack for USB accessory audio.
// Here we set the correct value for period_count if tinyalsa fails to get it from the
// f_audio_source driver.
if (proxy->alsa_config.period_count == 0) {
proxy->alsa_config.period_count = 4;
}
proxy->pcm = NULL;
// config format should be checked earlier against profile.
if (config->format >= 0 && (size_t)config->format < ARRAY_SIZE(format_byte_size_map)) {
proxy->frame_size = format_byte_size_map[config->format] * proxy->alsa_config.channels;
} else {
proxy->frame_size = 1;
}
}