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alsa: rework buffer/period configuration

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- As discussed on alsa-devel it's probably better to initialize the
  buffer size first, followed by the period size. If that fails try the
  other way round. If that fails try to configure only buffer size. If
  that fails try to configure only period size. Finally, try to
  configure neither.

- Don't require integral periods anymore.

Both of these changes should help improving compatibility with various
weirder sound devices, such as TV cards.
This commit is contained in:
Lennart Poettering 2009-09-09 04:28:52 +02:00
parent 71e066c873
commit 557c429510
4 changed files with 216 additions and 129 deletions
Download patch file Download diff file Expand all files Collapse all files

10
src/modules/alsa/alsa-util.h
View file

@ -42,8 +42,8 @@
int pa_alsa_set_hw_params(
snd_pcm_t *pcm_handle,
pa_sample_spec *ss, /* modified at return */
uint32_t *periods, /* modified at return */
snd_pcm_uframes_t *period_size, /* modified at return */
snd_pcm_uframes_t *buffer_size, /* modified at return */
snd_pcm_uframes_t tsched_size,
pa_bool_t *use_mmap, /* modified at return */
pa_bool_t *use_tsched, /* modified at return */
@ -60,8 +60,8 @@ snd_pcm_t *pa_alsa_open_by_device_id_auto(
pa_sample_spec *ss, /* modified at return */
pa_channel_map* map, /* modified at return */
int mode,
uint32_t *nfrags, /* modified at return */
snd_pcm_uframes_t *period_size, /* modified at return */
snd_pcm_uframes_t *buffer_size, /* modified at return */
snd_pcm_uframes_t tsched_size,
pa_bool_t *use_mmap, /* modified at return */
pa_bool_t *use_tsched, /* modified at return */
@ -75,8 +75,8 @@ snd_pcm_t *pa_alsa_open_by_device_id_mapping(
pa_sample_spec *ss, /* modified at return */
pa_channel_map* map, /* modified at return */
int mode,
uint32_t *nfrags, /* modified at return */
snd_pcm_uframes_t *period_size, /* modified at return */
snd_pcm_uframes_t *buffer_size, /* modified at return */
snd_pcm_uframes_t tsched_size,
pa_bool_t *use_mmap, /* modified at return */
pa_bool_t *use_tsched, /* modified at return */
@ -89,8 +89,8 @@ snd_pcm_t *pa_alsa_open_by_device_string(
pa_sample_spec *ss, /* modified at return */
pa_channel_map* map, /* modified at return */
int mode,
uint32_t *nfrags, /* modified at return */
snd_pcm_uframes_t *period_size, /* modified at return */
snd_pcm_uframes_t *buffer_size, /* modified at return */
snd_pcm_uframes_t tsched_size,
pa_bool_t *use_mmap, /* modified at return */
pa_bool_t *use_tsched, /* modified at return */
@ -104,8 +104,8 @@ snd_pcm_t *pa_alsa_open_by_template(
pa_sample_spec *ss, /* modified at return */
pa_channel_map* map, /* modified at return */
int mode,
uint32_t *nfrags, /* modified at return */
snd_pcm_uframes_t *period_size, /* modified at return */
snd_pcm_uframes_t *buffer_size, /* modified at return */
snd_pcm_uframes_t tsched_size,
pa_bool_t *use_mmap, /* modified at return */
pa_bool_t *use_tsched, /* modified at return */