PawletOS/android_device_brcm_rpi4
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audio: cache pcm card and device

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* It's always been intended that changing audio output devices requires
  a reboot. Get the PCM card and device once when the HAL is initialized.
  Might save a few ms on start_output_stream.
This commit is contained in:
Konsta
2025-03-31 00:38:12 +03:00
parent efd4ccabbe
commit c163d769fd
1 changed files with 9 additions and 2 deletions
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11
audio/audio_hw.c
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@@ -57,6 +57,9 @@
#define CHANNEL_STEREO 2
#define MIN_WRITE_SLEEP_US 5000
int pcm_card;
int pcm_device;
struct stub_stream_in {
struct audio_stream_in stream;
};
@@ -148,7 +151,7 @@ static int start_output_stream(struct alsa_stream_out *out)
out->config.start_threshold = PLAYBACK_PERIOD_START_THRESHOLD * PERIOD_SIZE;
out->config.avail_min = PERIOD_SIZE;
out->pcm = pcm_open(get_pcm_card(), get_pcm_device(), PCM_OUT | PCM_MMAP | PCM_NOIRQ | PCM_MONOTONIC, &out->config);
out->pcm = pcm_open(pcm_card, pcm_device, PCM_OUT | PCM_MMAP | PCM_NOIRQ | PCM_MONOTONIC, &out->config);
if (!pcm_is_ready(out->pcm)) {
ALOGE("cannot open pcm_out driver: %s", pcm_get_error(out->pcm));
@@ -484,7 +487,7 @@ static int adev_open_output_stream(struct audio_hw_device *dev,
struct pcm_params *params;
int ret = 0;
params = pcm_params_get(get_pcm_card(), get_pcm_device(), PCM_OUT);
params = pcm_params_get(pcm_card, pcm_device, PCM_OUT);
if (!params)
return -ENOSYS;
@@ -690,6 +693,10 @@ static int adev_open(const hw_module_t* module, const char* name,
ALOGV("adev_open: %s", name);
pcm_card = get_pcm_card();
pcm_device = get_pcm_device();
ALOGI("adev_open: pcm_card %d, pcm_device %d", pcm_card, pcm_device);
if (strcmp(name, AUDIO_HARDWARE_INTERFACE) != 0)
return -EINVAL;