diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/mixer.c | 90 | ||||
| -rw-r--r-- | src/pcm.c | 30 |
2 files changed, 120 insertions, 0 deletions
diff --git a/src/mixer.c b/src/mixer.c index e6f50bb..0fe9c99 100644 --- a/src/mixer.c +++ b/src/mixer.c @@ -53,7 +53,9 @@ struct mixer_ctl { /** The mixer that the mixer control belongs to */ struct mixer *mixer; + /** Information on the control's value (i.e. type, number of values) */ struct snd_ctl_elem_info info; + /** A list of string representations of enumerated values (only valid for enumerated controls) */ char **ename; }; @@ -363,6 +365,13 @@ static int int_to_percent(struct snd_ctl_elem_info *ei, int value) return ((value - ei->value.integer.min) / range) * 100; } +/** Gets a percentage representation of a specified control value. + * @param ctl An initialized control handle. + * @param id The index of the value within the control. + * @returns On success, the percentage representation of the control value. + * On failure, -EINVAL is returned. + * @ingroup libtinyalsa-mixer + */ int mixer_ctl_get_percent(struct mixer_ctl *ctl, unsigned int id) { if (!ctl || (ctl->info.type != SNDRV_CTL_ELEM_TYPE_INTEGER)) @@ -371,6 +380,14 @@ int mixer_ctl_get_percent(struct mixer_ctl *ctl, unsigned int id) return int_to_percent(&ctl->info, mixer_ctl_get_value(ctl, id)); } +/** Sets the value of a control by percent, specified by the value index. + * @param ctl An initialized control handle. + * @param id The index of the value to set + * @param percent A percentage value between 0 and 100. + * @returns On success, zero is returned. + * On failure, non-zero is returned. + * @ingroup libtinyalsa-mixer + */ int mixer_ctl_set_percent(struct mixer_ctl *ctl, unsigned int id, int percent) { if (!ctl || (ctl->info.type != SNDRV_CTL_ELEM_TYPE_INTEGER)) @@ -379,6 +396,13 @@ int mixer_ctl_set_percent(struct mixer_ctl *ctl, unsigned int id, int percent) return mixer_ctl_set_value(ctl, id, percent_to_int(&ctl->info, percent)); } +/** Gets the value of a control. + * @param ctl An initialized control handle. + * @param id The index of the control value. + * @returns On success, the specified value is returned. + * On failure, -EINVAL is returned. + * @ingroup libtinyalsa-mixer + */ int mixer_ctl_get_value(struct mixer_ctl *ctl, unsigned int id) { struct snd_ctl_elem_value ev; @@ -413,6 +437,18 @@ int mixer_ctl_get_value(struct mixer_ctl *ctl, unsigned int id) return 0; } +/** Gets the contents of a control's value array. + * @param ctl An initialized control handle. + * @param array A pointer to write the array data to. + * The size of this array must be equal to the number of items in the array + * multiplied by the size of each item. + * @param count The number of items in the array. + * This parameter must match the number of items in the control. + * The number of items in the control may be accessed via @ref mixer_ctl_get_num_values + * @returns On success, zero. + * On failure, non-zero. + * @ingroup libtinyalsa-mixer + */ int mixer_ctl_get_array(struct mixer_ctl *ctl, void *array, size_t count) { struct snd_ctl_elem_value ev; @@ -475,6 +511,16 @@ int mixer_ctl_get_array(struct mixer_ctl *ctl, void *array, size_t count) return 0; } +/** Sets the value of a control, specified by the value index. + * @param ctl An initialized control handle. + * @param id The index of the value within the control. + * @param value The value to set. + * This must be in a range specified by @ref mixer_ctl_get_range_min + * and @ref mixer_ctl_get_range_max. + * @returns On success, zero is returned. + * On failure, non-zero is returned. + * @ingroup libtinyalsa-mixer + */ int mixer_ctl_set_value(struct mixer_ctl *ctl, unsigned int id, int value) { struct snd_ctl_elem_value ev; @@ -518,6 +564,16 @@ int mixer_ctl_set_value(struct mixer_ctl *ctl, unsigned int id, int value) return ioctl(ctl->mixer->fd, SNDRV_CTL_IOCTL_ELEM_WRITE, &ev); } +/** Sets the contents of a control's value array. + * @param ctl An initialized control handle. + * @param array The array containing control values. + * @param count The number of values in the array. + * This must match the number of values in the control. + * The number of values in a control may be accessed via @ref mixer_ctl_get_num_values + * @returns On success, zero. + * On failure, non-zero. + * @ingroup libtinyalsa-mixer + */ int mixer_ctl_set_array(struct mixer_ctl *ctl, const void *array, size_t count) { struct snd_ctl_elem_value ev; @@ -570,6 +626,14 @@ int mixer_ctl_set_array(struct mixer_ctl *ctl, const void *array, size_t count) return ioctl(ctl->mixer->fd, SNDRV_CTL_IOCTL_ELEM_WRITE, &ev); } +/** Gets the minimum value of an control. + * The control must have an integer type. + * The type of the control can be checked with @ref mixer_ctl_get_type. + * @param ctl An initialized control handle. + * @returns On success, the minimum value of the control. + * On failure, -EINVAL. + * @ingroup libtinyalsa-mixer + */ int mixer_ctl_get_range_min(struct mixer_ctl *ctl) { if (!ctl || (ctl->info.type != SNDRV_CTL_ELEM_TYPE_INTEGER)) @@ -578,6 +642,14 @@ int mixer_ctl_get_range_min(struct mixer_ctl *ctl) return ctl->info.value.integer.min; } +/** Gets the maximum value of an control. + * The control must have an integer type. + * The type of the control can be checked with @ref mixer_ctl_get_type. + * @param ctl An initialized control handle. + * @returns On success, the maximum value of the control. + * On failure, -EINVAL. + * @ingroup libtinyalsa-mixer + */ int mixer_ctl_get_range_max(struct mixer_ctl *ctl) { if (!ctl || (ctl->info.type != SNDRV_CTL_ELEM_TYPE_INTEGER)) @@ -586,6 +658,11 @@ int mixer_ctl_get_range_max(struct mixer_ctl *ctl) return ctl->info.value.integer.max; } +/** Get the number of enumerated items in the control. + * @param ctl An initialized control handle. + * @returns The number of enumerated items in the control. + * @ingroup libtinyalsa-mixer + */ unsigned int mixer_ctl_get_num_enums(struct mixer_ctl *ctl) { if (!ctl) @@ -632,6 +709,12 @@ fail: return -1; } +/** Gets the string representation of an enumerated item. + * @param ctl An initialized control handle. + * @param enum_id The index of the enumerated value. + * @returns A string representation of the enumerated item. + * @ingroup libtinyalsa-mixer + */ const char *mixer_ctl_get_enum_string(struct mixer_ctl *ctl, unsigned int enum_id) { @@ -643,6 +726,13 @@ const char *mixer_ctl_get_enum_string(struct mixer_ctl *ctl, return (const char *)ctl->ename[enum_id]; } +/** Set an enumeration value by string value. + * @param ctl An enumerated mixer control. + * @param string The string representation of an enumeration. + * @returns On success, zero. + * On failure, zero. + * @ingroup libtinyalsa-mixer + */ int mixer_ctl_set_enum_by_string(struct mixer_ctl *ctl, const char *string) { unsigned int i, num_enums; @@ -172,6 +172,7 @@ struct pcm { int underruns; /** Size of the buffer */ unsigned int buffer_size; + /** The boundary for ring buffer pointers */ unsigned int boundary; /** Description of the last error that occured */ char error[PCM_ERROR_MAX]; @@ -182,7 +183,9 @@ struct pcm { struct snd_pcm_sync_ptr *sync_ptr; void *mmap_buffer; unsigned int noirq_frames_per_msec; + /** The delay of the PCM, in terms of frames */ long pcm_delay; + /** The subdevice corresponding to the PCM */ unsigned int subdevice; }; @@ -198,6 +201,7 @@ unsigned int pcm_get_buffer_size(struct pcm *pcm) /** Gets the file descriptor of the PCM. * Useful for extending functionality of the PCM when needed. + * @param pcm A PCM handle. * @return The file descriptor of the PCM. * @ingroup libtinyalsa-pcm */ @@ -709,6 +713,12 @@ struct pcm_mask *pcm_params_get_mask(struct pcm_params *pcm_params, return (struct pcm_mask *)param_to_mask(params, p); } +/** Get the minimum of a specified PCM parameter. + * @param pcm_params A PCM parameters structure. + * @param param The specified parameter to get the minimum of. + * @returns On success, the parameter minimum. + * On failure, zero. + */ unsigned int pcm_params_get_min(struct pcm_params *pcm_params, enum pcm_param param) { @@ -725,6 +735,12 @@ unsigned int pcm_params_get_min(struct pcm_params *pcm_params, return param_get_min(params, p); } +/** Get the maximum of a specified PCM parameter. + * @param pcm_params A PCM parameters structure. + * @param param The specified parameter to get the maximum of. + * @returns On success, the parameter maximum. + * On failure, zero. + */ unsigned int pcm_params_get_max(struct pcm_params *pcm_params, enum pcm_param param) { @@ -1118,6 +1134,14 @@ int pcm_state(struct pcm *pcm) return pcm->mmap_status->state; } +/** Waits for frames to be available for read or write operations. + * @param pcm A PCM handle. + * @param timeout The maximum amount of time to wait for, in terms of milliseconds. + * @returns If frames became available, one is returned. + * If a timeout occured, zero is returned. + * If an error occured, a negative number is returned. + * @ingroup libtinyalsa-pcm + */ int pcm_wait(struct pcm *pcm, int timeout) { struct pollfd pfd; @@ -1253,6 +1277,12 @@ int pcm_mmap_read(struct pcm *pcm, void *data, unsigned int count) return pcm_mmap_transfer(pcm, data, count); } +/** Gets the delay of the PCM, in terms of frames. + * @param pcm A PCM handle. + * @returns On success, the delay of the PCM. + * On failure, a negative number. + * @ingroup libtinyalsa-pcm + */ long pcm_get_delay(struct pcm *pcm) { if (ioctl(pcm->fd, SNDRV_PCM_IOCTL_DELAY, &pcm->pcm_delay) < 0) |