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pcm: introduce defaults.pcm.compat to change the params choose behaviour

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Having getenv directly in the function is not a good idea. Allow
configuration of the behaviour change in snd_pcm_param_choose() function
using alsa.conf. Use the environment variable LIBASOUND_COMPAT only
as fallback.

Signed-off-by: Jaroslav Kysela <perex@perex.cz>
This commit is contained in:
Jaroslav Kysela 2010-08-11 20:20:40 +02:00
parent 09879a4bb5
commit de606e9c25
4 changed files with 16 additions and 3 deletions
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1
src/conf/alsa.conf
View file

@ -63,6 +63,7 @@ defaults.pcm.card 0
defaults.pcm.device 0
defaults.pcm.subdevice -1
defaults.pcm.nonblock 1
defaults.pcm.compat 0
defaults.pcm.minperiodtime 5000 # in us
defaults.pcm.ipc_key 5678293
defaults.pcm.ipc_gid audio

12
src/pcm/pcm.c
View file

@ -2192,6 +2192,18 @@ static int snd_pcm_open_conf(snd_pcm_t **pcmp, const char *name,
}
}
if (err >= 0) {
err = snd_config_search(pcm_root, "defaults.pcm.compat", &tmp);
if (err >= 0) {
long i;
if (snd_config_get_integer(tmp, &i) >= 0) {
if (i > 0)
(*pcmp)->compat = 1;
}
} else {
char *str = getenv("LIBASOUND_COMPAT");
if (str && *str)
(*pcmp)->compat = 1;
}
err = snd_config_search(pcm_root, "defaults.pcm.minperiodtime", &tmp);
if (err >= 0)
snd_config_get_integer(tmp, &(*pcmp)->minperiodtime);

3
src/pcm/pcm_local.h
View file

@ -184,7 +184,8 @@ struct _snd_pcm {
int poll_fd;
unsigned short poll_events;
int setup: 1,
monotonic: 1;
monotonic: 1,
compat: 1;
snd_pcm_access_t access; /* access mode */
snd_pcm_format_t format; /* SND_PCM_FORMAT_* */
snd_pcm_subformat_t subformat; /* subformat */

3
src/pcm/pcm_params.c
View file

@ -1081,7 +1081,6 @@ int snd_pcm_hw_param_never_eq(const snd_pcm_hw_params_t *params,
static int snd_pcm_hw_params_choose(snd_pcm_t *pcm, snd_pcm_hw_params_t *params)
{
int err;
const char *compat = getenv("LIBASOUND_COMPAT");
#ifdef CHOOSE_DEBUG
snd_output_t *log;
snd_output_stdio_attach(&log, stderr, 0);
@ -1115,7 +1114,7 @@ static int snd_pcm_hw_params_choose(snd_pcm_t *pcm, snd_pcm_hw_params_t *params)
snd_pcm_hw_param_set_min(pcm, params, SND_CHANGE, SND_PCM_HW_PARAM_PERIOD_TIME, &min, &dir);
}
}
if (compat && *compat) {
if (pcm->compat) {
/* old mode */
err = snd_pcm_hw_param_set_first(pcm, params, SND_PCM_HW_PARAM_PERIOD_TIME, NULL, 0);
if (err < 0)