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| author | Takashi Sakamoto <o-takashi@sakamocchi.jp> | 2017-05-26 09:30:46 +0900 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2017-05-26 08:38:14 +0200 |
| commit | 2c4842d3b6b3cf6db0f21e487da7e9bd3aa23090 (patch) | |
| tree | 43a861b3b2041b687ad38927ea79cb87eef76ccc /sound/core/pcm_local.h | |
| parent | 9027c4639ef1e3254779e3033f229133222445f7 (diff) | |
| download | linux-stable-2c4842d3b6b3cf6db0f21e487da7e9bd3aa23090.tar.gz linux-stable-2c4842d3b6b3cf6db0f21e487da7e9bd3aa23090.tar.bz2 linux-stable-2c4842d3b6b3cf6db0f21e487da7e9bd3aa23090.zip | |
ALSA: pcm: add local header file for snd-pcm module
Several files are used to construct PCM core module, a.k.a snd-pcm.
Although available APIs are described in 'include/sound/pcm.h', some of
them are not exported as symbols in kernel space. Such APIs are just for
module local usage.
This commit adds module local header file and move some function prototypes
into it so that scopes of them are controlled properly and developers
get no confusion from unavailable symbols.
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/core/pcm_local.h')
| -rw-r--r-- | sound/core/pcm_local.h | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/sound/core/pcm_local.h b/sound/core/pcm_local.h new file mode 100644 index 000000000000..34c66decaaf2 --- /dev/null +++ b/sound/core/pcm_local.h @@ -0,0 +1,51 @@ +/* + * pcm_local.h - a local header file for snd-pcm module. + * + * Copyright (c) Takashi Sakamoto <o-takashi@sakamocchi.jp> + * + * Licensed under the terms of the GNU General Public License, version 2. + */ + +#ifndef __SOUND_CORE_PCM_LOCAL_H +#define __SOUND_CORE_PCM_LOCAL_H + +extern const struct snd_pcm_hw_constraint_list snd_pcm_known_rates; + +void snd_interval_mul(const struct snd_interval *a, + const struct snd_interval *b, struct snd_interval *c); +void snd_interval_div(const struct snd_interval *a, + const struct snd_interval *b, struct snd_interval *c); +void snd_interval_muldivk(const struct snd_interval *a, + const struct snd_interval *b, + unsigned int k, struct snd_interval *c); +void snd_interval_mulkdiv(const struct snd_interval *a, unsigned int k, + const struct snd_interval *b, struct snd_interval *c); + +int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream); +int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream); + +int snd_pcm_hw_params_choose(struct snd_pcm_substream *substream, + struct snd_pcm_hw_params *params); + +int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime *runtime, + snd_pcm_hw_param_t var, u_int32_t mask); + +int snd_pcm_update_state(struct snd_pcm_substream *substream, + struct snd_pcm_runtime *runtime); +int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream); + +void snd_pcm_playback_silence(struct snd_pcm_substream *substream, + snd_pcm_uframes_t new_hw_ptr); + +#ifdef CONFIG_SND_PCM_TIMER +void snd_pcm_timer_resolution_change(struct snd_pcm_substream *substream); +void snd_pcm_timer_init(struct snd_pcm_substream *substream); +void snd_pcm_timer_done(struct snd_pcm_substream *substream); +#else +static inline void +snd_pcm_timer_resolution_change(struct snd_pcm_substream *substream) {} +static inline void snd_pcm_timer_init(struct snd_pcm_substream *substream) {} +static inline void snd_pcm_timer_done(struct snd_pcm_substream *substream) {} +#endif + +#endif /* __SOUND_CORE_PCM_LOCAL_H */ |