diff options
Diffstat (limited to 'sound/core/pcm_native.c')
| -rw-r--r-- | sound/core/pcm_native.c | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/sound/core/pcm_native.c b/sound/core/pcm_native.c index 3293db0172db..8d9d181b1c03 100644 --- a/sound/core/pcm_native.c +++ b/sound/core/pcm_native.c @@ -571,6 +571,46 @@ static inline void snd_pcm_timer_notify(struct snd_pcm_substream *substream, #endif } +/** + * snd_pcm_hw_param_choose - choose a configuration defined by @params + * @pcm: PCM instance + * @params: the hw_params instance + * + * Choose one configuration from configuration space defined by @params. + * The configuration chosen is that obtained fixing in this order: + * first access, first format, first subformat, min channels, + * min rate, min period time, max buffer size, min tick time + * + * Return: Zero if successful, or a negative error code on failure. + */ +static int snd_pcm_hw_params_choose(struct snd_pcm_substream *pcm, + struct snd_pcm_hw_params *params) +{ + static const int vars[] = { + SNDRV_PCM_HW_PARAM_ACCESS, + SNDRV_PCM_HW_PARAM_FORMAT, + SNDRV_PCM_HW_PARAM_SUBFORMAT, + SNDRV_PCM_HW_PARAM_CHANNELS, + SNDRV_PCM_HW_PARAM_RATE, + SNDRV_PCM_HW_PARAM_PERIOD_TIME, + SNDRV_PCM_HW_PARAM_BUFFER_SIZE, + SNDRV_PCM_HW_PARAM_TICK_TIME, + -1 + }; + const int *v; + int err; + + for (v = vars; *v != -1; v++) { + if (*v != SNDRV_PCM_HW_PARAM_BUFFER_SIZE) + err = snd_pcm_hw_param_first(pcm, params, *v, NULL); + else + err = snd_pcm_hw_param_last(pcm, params, *v, NULL); + if (snd_BUG_ON(err < 0)) + return err; + } + return 0; +} + static int snd_pcm_hw_params(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params) { |