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alsa: rework batch handling a bit

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By default, use a 512 period for batch and use 512 headroom
Add a property to disable special batch handling.
This commit is contained in:
Wim Taymans 2021-01-21 17:10:48 +01:00
parent af092a9a7e
commit 73896bfa83
5 changed files with 28 additions and 31 deletions
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14
spa/plugins/alsa/alsa-pcm-source.c
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@ -797,6 +797,7 @@ impl_init(const struct spa_handle_factory *factory,
snd_config_update_free_global();
for (i = 0; info && i < info->n_items; i++) {
const char *s = info->items[i].value;
if (!strcmp(info->items[i].key, SPA_KEY_API_ALSA_PATH)) {
snprintf(this->props.device, 63, "%s", info->items[i].value);
} else if (!strcmp(info->items[i].key, SPA_KEY_AUDIO_CHANNELS)) {
@ -807,20 +808,21 @@ impl_init(const struct spa_handle_factory *factory,
this->default_format = spa_alsa_format_from_name(info->items[i].value, 128);
} else if (!strcmp(info->items[i].key, SPA_KEY_AUDIO_POSITION)) {
size_t len;
const char *p = info->items[i].value;
while (*p && this->default_pos.channels < SPA_AUDIO_MAX_CHANNELS) {
if ((len = strcspn(p, ",")) == 0)
while (*s && this->default_pos.channels < SPA_AUDIO_MAX_CHANNELS) {
if ((len = strcspn(s, ",")) == 0)
break;
this->default_pos.pos[this->default_pos.channels++] =
spa_alsa_channel_from_name(p, len);
p += len + strspn(p+len, ",");
spa_alsa_channel_from_name(s, len);
s += len + strspn(s+len, ",");
}
} else if (!strcmp(info->items[i].key, "api.alsa.period-size")) {
this->default_period_size = atoi(info->items[i].value);
} else if (!strcmp(info->items[i].key, "api.alsa.headroom")) {
this->default_headroom = atoi(info->items[i].value);
} else if (!strcmp(info->items[i].key, "api.alsa.disable-mmap")) {
this->disable_mmap = atoi(info->items[i].value);
this->disable_mmap = (strcmp(s, "true") == 0 || atoi(s) == 1);
} else if (!strcmp(info->items[i].key, "api.alsa.disable-batch")) {
this->disable_batch = (strcmp(s, "true") == 0 || atoi(s) == 1);
}
}
return 0;