diff options
Diffstat (limited to 'include')
| -rw-r--r-- | include/tinyalsa/asoundlib.h | 22 |
1 files changed, 20 insertions, 2 deletions
diff --git a/include/tinyalsa/asoundlib.h b/include/tinyalsa/asoundlib.h index 42f5348..01a6303 100644 --- a/include/tinyalsa/asoundlib.h +++ b/include/tinyalsa/asoundlib.h @@ -142,6 +142,13 @@ unsigned int pcm_params_get_max(struct pcm_params *pcm_params, /* Returns a human readable reason for the last error */ const char *pcm_get_error(struct pcm *pcm); +/* Returns the sample size in bits for a PCM format. + * As with ALSA formats, this is the storage size for the format, whereas the + * format represents the number of significant bits. For example, + * PCM_FORMAT_S24_LE uses 32 bits of storage. + */ +unsigned int pcm_format_to_bits(enum pcm_format format); + /* Returns the buffer size (int frames) that should be used for pcm_write. */ unsigned int pcm_get_buffer_size(struct pcm *pcm); unsigned int pcm_frames_to_bytes(struct pcm *pcm, unsigned int frames); @@ -171,6 +178,8 @@ int pcm_mmap_begin(struct pcm *pcm, void **areas, unsigned int *offset, unsigned int *frames); int pcm_mmap_commit(struct pcm *pcm, unsigned int offset, unsigned int frames); +/* Prepare the PCM substream to be triggerable */ +int pcm_prepare(struct pcm *pcm); /* Start and stop a PCM channel that doesn't transfer data */ int pcm_start(struct pcm *pcm); int pcm_stop(struct pcm *pcm); @@ -190,6 +199,9 @@ struct mixer_ctl; struct mixer *mixer_open(unsigned int card); void mixer_close(struct mixer *mixer); +/* Get info about a mixer */ +const char *mixer_get_name(struct mixer *mixer); + /* Obtain mixer controls */ unsigned int mixer_get_num_ctls(struct mixer *mixer); struct mixer_ctl *mixer_get_ctl(struct mixer *mixer, unsigned int id); @@ -204,14 +216,20 @@ unsigned int mixer_ctl_get_num_enums(struct mixer_ctl *ctl); const char *mixer_ctl_get_enum_string(struct mixer_ctl *ctl, unsigned int enum_id); +/* Some sound cards update their controls due to external events, + * such as HDMI EDID byte data changing when an HDMI cable is + * connected. This API allows the count of elements to be updated. + */ +void mixer_ctl_update(struct mixer_ctl *ctl); + /* Set and get mixer controls */ int mixer_ctl_get_percent(struct mixer_ctl *ctl, unsigned int id); int mixer_ctl_set_percent(struct mixer_ctl *ctl, unsigned int id, int percent); int mixer_ctl_get_value(struct mixer_ctl *ctl, unsigned int id); -int mixer_ctl_get_bytes(struct mixer_ctl *ctl, void *data, size_t len); +int mixer_ctl_get_array(struct mixer_ctl *ctl, void *array, size_t count); int mixer_ctl_set_value(struct mixer_ctl *ctl, unsigned int id, int value); -int mixer_ctl_set_bytes(struct mixer_ctl *ctl, const void *data, size_t len); +int mixer_ctl_set_array(struct mixer_ctl *ctl, const void *array, size_t count); int mixer_ctl_set_enum_by_string(struct mixer_ctl *ctl, const char *string); /* Determe range of integer mixer controls */ |