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alsa: Don't disable timer-based scheduling on USB devices

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This isn't a great fix, but we need ALSA API to do this right. In the
mean time, USB devices work fine with timer-based scheduling, so there's
no reason to force a large minimum latency by disabling tsched on them.
This commit is contained in:
Arun Raghavan 2015-12-29 06:00:14 +05:30
parent 5e8161448e
commit 810aa36189
1 changed files with 19 additions and 2 deletions
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21
src/modules/alsa/alsa-util.c
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@ -261,8 +261,25 @@ int pa_alsa_set_hw_params(
/* The PCM pointer is only updated with period granularity */ /* The PCM pointer is only updated with period granularity */
if (snd_pcm_hw_params_is_batch(hwparams)) { if (snd_pcm_hw_params_is_batch(hwparams)) {
pa_log_info("Disabling tsched mode since BATCH flag is set"); bool is_usb = false;
_use_tsched = false; const char *id;
snd_pcm_info_t* pcm_info;
snd_pcm_info_alloca(&pcm_info);
if (snd_pcm_info(pcm_handle, pcm_info) == 0 &&
(id = snd_pcm_info_get_id(pcm_info))) {
/* This horrible hack makes sure we don't disable tsched on USB
* devices, which have a low enough transfer size for timer-based
* scheduling to work. This can go away when the ALSA API supprots
* querying the block transfer size. */
if (pa_streq(id, "USB Audio"))
is_usb = true;
}
if (!is_usb) {
pa_log_info("Disabling tsched mode since BATCH flag is set");
_use_tsched = false;
}
} }
#if (SND_LIB_VERSION >= ((1<<16)|(0<<8)|24)) /* API additions in 1.0.24 */ #if (SND_LIB_VERSION >= ((1<<16)|(0<<8)|24)) /* API additions in 1.0.24 */