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add new wrapper pa_alsa_safe_delay() around snd_pcm_delay()

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This commit is contained in:
Lennart Poettering 2009-02-23 22:55:33 +01:00
parent 5cc9d970c8
commit 557a90c487
2 changed files with 38 additions and 0 deletions
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37
src/modules/alsa/alsa-util.c
View file

@ -1586,6 +1586,43 @@ 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) {
ssize_t k;
size_t abs_k;
int r;
pa_assert(pcm);
pa_assert(delay);
pa_assert(hwbuf_size > 0);
pa_assert(ss);
/* Some ALSA driver expose weird bugs, let's inform the user about
* what is going on */
if ((r = snd_pcm_delay(pcm, delay)) < 0)
return r;
k = (ssize_t) *delay * (ssize_t) pa_frame_size(ss);
abs_k = k >= 0 ? (size_t) k : (size_t) -k;
if (abs_k >= hwbuf_size * 3 ||
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_delay() returned a value that is exceptionally large: %li bytes (%s%lu ms).\n"
"Most likely this is a bug in the ALSA driver '%s'. Please report this issue to the ALSA developers."),
(signed long) k,
k < 0 ? "-" : "",
(unsigned long) (pa_bytes_to_usec(abs_k, ss) / PA_USEC_PER_MSEC),
pa_strnull(dn));
pa_xfree(dn);
} PA_ONCE_END;
return 0;
}
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) {
int r;
snd_pcm_uframes_t before;

1
src/modules/alsa/alsa-util.h
View file

@ -129,6 +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_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);