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alsa: work around slightly broken _delay implementations

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Use snd_pcm_avail_delay() in pa_alsa_safe_delay() so that we can check the delay
value against the avail value and patch it up when it looks invalid. Only do
this for capture.
This commit is contained in:
Wim Taymans 2010-09-08 13:26:39 +02:00 • committed by Colin Guthrie
parent 74c117f49f
commit 1c29f5582d
4 changed files with 46 additions and 6 deletions
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2
src/modules/alsa/alsa-sink.c
View file

@ -803,7 +803,7 @@ static void update_smoother(struct userdata *u) {
/* Let's update the time smoother */
if (PA_UNLIKELY((err = pa_alsa_safe_delay(u->pcm_handle, &delay, u->hwbuf_size, &u->sink->sample_spec)) < 0)) {
if (PA_UNLIKELY((err = pa_alsa_safe_delay(u->pcm_handle, &delay, u->hwbuf_size, &u->sink->sample_spec, FALSE)) < 0)) {
pa_log_warn("Failed to query DSP status data: %s", pa_alsa_strerror(err));
return;
}

2
src/modules/alsa/alsa-source.c
View file

@ -760,7 +760,7 @@ static void update_smoother(struct userdata *u) {
/* Let's update the time smoother */
if (PA_UNLIKELY((err = pa_alsa_safe_delay(u->pcm_handle, &delay, u->hwbuf_size, &u->source->sample_spec)) < 0)) {
if (PA_UNLIKELY((err = pa_alsa_safe_delay(u->pcm_handle, &delay, u->hwbuf_size, &u->source->sample_spec, TRUE)) < 0)) {
pa_log_warn("Failed to get delay: %s", pa_alsa_strerror(err));
return;
}

46
src/modules/alsa/alsa-util.c
View file

@ -1125,10 +1125,11 @@ snd_pcm_sframes_t pa_alsa_safe_avail(snd_pcm_t *pcm, size_t hwbuf_size, const pa
return n;
}
int pa_alsa_safe_delay(snd_pcm_t *pcm, snd_pcm_sframes_t *delay, size_t hwbuf_size, const pa_sample_spec *ss) {
int pa_alsa_safe_delay(snd_pcm_t *pcm, snd_pcm_sframes_t *delay, size_t hwbuf_size, const pa_sample_spec *ss, pa_bool_t capture) {
ssize_t k;
size_t abs_k;
int r;
snd_pcm_sframes_t avail = 0;
pa_assert(pcm);
pa_assert(delay);
@ -1136,9 +1137,10 @@ int pa_alsa_safe_delay(snd_pcm_t *pcm, snd_pcm_sframes_t *delay, size_t hwbuf_si
pa_assert(ss);
/* Some ALSA driver expose weird bugs, let's inform the user about
* what is going on */
* what is going on. We're going to get both the avail and delay values so
* that we can compare and check them for capture */
if ((r = snd_pcm_delay(pcm, delay)) < 0)
if ((r = snd_pcm_avail_delay(pcm, &avail, delay)) < 0)
return r;
k = (ssize_t) *delay * (ssize_t) pa_frame_size(ss);
@ -1167,6 +1169,44 @@ int pa_alsa_safe_delay(snd_pcm_t *pcm, snd_pcm_sframes_t *delay, size_t hwbuf_si
*delay = (snd_pcm_sframes_t) (hwbuf_size / pa_frame_size(ss));
}
if (capture) {
abs_k = (size_t) avail * pa_frame_size(ss);
if (abs_k >= hwbuf_size * 5 ||
abs_k >= pa_bytes_per_second(ss)*10) {
PA_ONCE_BEGIN {
char *dn = pa_alsa_get_driver_name_by_pcm(pcm);
pa_log(_("snd_pcm_avail() returned a value that is exceptionally large: %lu bytes (%lu ms).\n"
"Most likely this is a bug in the ALSA driver '%s'. Please report this issue to the ALSA developers."),
(unsigned long) k,
(unsigned long) (pa_bytes_to_usec(k, ss) / PA_USEC_PER_MSEC),
pa_strnull(dn));
pa_xfree(dn);
pa_alsa_dump(PA_LOG_ERROR, pcm);
} PA_ONCE_END;
/* Mhmm, let's try not to fail completely */
avail = (snd_pcm_sframes_t) (hwbuf_size / pa_frame_size(ss));
}
if (*delay < avail) {
PA_ONCE_BEGIN {
char *dn = pa_alsa_get_driver_name_by_pcm(pcm);
pa_log(_("snd_pcm_avail_delay() returned strange values: delay %lu is less than avail %lu.\n"
"Most likely this is a bug in the ALSA driver '%s'. Please report this issue to the ALSA developers."),
(unsigned long) *delay,
(unsigned long) avail,
pa_strnull(dn));
pa_xfree(dn);
pa_alsa_dump(PA_LOG_ERROR, pcm);
} PA_ONCE_END;
/* try to fixup */
*delay = avail;
}
}
return 0;
}

2
src/modules/alsa/alsa-util.h
View file

@ -129,7 +129,7 @@ int pa_alsa_recover_from_poll(snd_pcm_t *pcm, int revents);
pa_rtpoll_item* pa_alsa_build_pollfd(snd_pcm_t *pcm, pa_rtpoll *rtpoll);
snd_pcm_sframes_t pa_alsa_safe_avail(snd_pcm_t *pcm, size_t hwbuf_size, const pa_sample_spec *ss);
int pa_alsa_safe_delay(snd_pcm_t *pcm, snd_pcm_sframes_t *delay, size_t hwbuf_size, const pa_sample_spec *ss);
int pa_alsa_safe_delay(snd_pcm_t *pcm, snd_pcm_sframes_t *delay, size_t hwbuf_size, const pa_sample_spec *ss, pa_bool_t capture);
int pa_alsa_safe_mmap_begin(snd_pcm_t *pcm, const snd_pcm_channel_area_t **areas, snd_pcm_uframes_t *offset, snd_pcm_uframes_t *frames, size_t hwbuf_size, const pa_sample_spec *ss);
char *pa_alsa_get_driver_name(int card);