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audio: probe pcm card for jack & dac

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Konsta
2023-11-21 14:27:51 +02:00
parent ef056e1f91
commit 0205059ddb
1 changed files with 35 additions and 0 deletions
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35
audio/audio_hw.c
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@@ -84,9 +84,44 @@ struct alsa_stream_out {
unsigned int written;
};
static int probe_pcm_out_card() {
FILE *fp;
char card_node[] = "/proc/asound/card0/id";
char card_id[64];
char card_prop[PROPERTY_VALUE_MAX];
property_get("persist.audio.device", card_prop, "");
for (int i = 0; i < 5; i++) {
card_node[17] = i + '0';
if ((fp = fopen(card_node, "r")) != NULL) {
fgets(card_id, sizeof(card_id), fp);
ALOGV("%s: %s", card_node, card_id);
if (!strcmp(card_prop, "jack") && !strncmp(card_id, "Headphones", 10)) {
fclose(fp);
ALOGI("Using PCM card %d for 3.5mm audio jack", i);
return i;
} else if (!strcmp(card_prop, "dac") && strncmp(card_id, "Headphones", 10)
&& strncmp(card_id, "vc4hdmi", 7)) {
fclose(fp);
ALOGI("Using PCM card %d for audio DAC %s", i, card_id);
return i;
}
fclose(fp);
}
}
ALOGE("Could not probe PCM card for %s, using PCM card 0", card_prop);
return 0;
}
static int get_pcm_card()
{
char card[PROPERTY_VALUE_MAX];
property_get("persist.audio.pcm.card.auto", card, "false");
if (!strcmp(card, "true"))
return probe_pcm_out_card();
property_get("persist.audio.pcm.card", card, "0");
return atoi(card);
}