snd_pcm_hw_constraint_msbits – add a hw constraint msbits rule Synopsis int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime, unsigned int cond, unsigned int width, unsigned int msbits); Arguments runtime PCM runtime instance cond condition bits width sample bits width msbits msbits width Description This constraint will set the number of most significant bits (msbits) if a sample format with the…
snd_pcm_hw_constraint_minmax – apply a min/max range constraint to an interval Synopsis int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var, unsigned int min, unsigned int max); Arguments runtime PCM runtime instance var hw_params variable to apply the range min the minimal value max the maximal value Description Apply the min/max range constraint to an interval parameter. Return Positive…
snd_pcm_hw_constraint_mask64 – apply the given bitmap mask constraint Synopsis int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var, u_int64_t mask); Arguments runtime PCM runtime instance var hw_params variable to apply the mask mask the 64bit bitmap mask Description Apply the constraint of the given bitmap mask to a 64-bit mask parameter. Return Zero if successful, or a negative…
snd_pcm_hw_constraint_list – apply a list of constraints to a parameter Synopsis int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime, unsigned int cond, snd_pcm_hw_param_t var, const struct snd_pcm_hw_constraint_list *l); Arguments runtime PCM runtime instance cond condition bits var hw_params variable to apply the list constraint l list Description Apply the list of constraints to an interval parameter. Return Zero if…
snd_pcm_hw_constraint_integer – apply an integer constraint to an interval Synopsis int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var); Arguments runtime PCM runtime instance var hw_params variable to apply the integer constraint Description Apply the constraint of integer to an interval parameter. Return Positive if the value is changed, zero if it’s not changed, or a negative error…
snd_pcm_group_for_each_entry – iterate over the linked substreams Synopsis snd_pcm_group_for_each_entry(s, substream); Arguments s the iterator substream the substream Description Iterate over the all linked substreams to the given substream. When substream isn’t linked with any others, this gives returns substream itself once. Copyright
snd_pcm_gettime – Fill the timespec depending on the timestamp mode Synopsis void snd_pcm_gettime(struct snd_pcm_runtime *runtime, struct timespec *tv); Arguments runtime PCM runtime instance tv timespec to fill Copyright
snd_pcm_format_width – return the bit-width of the format Synopsis int snd_pcm_format_width(snd_pcm_format_t format); Arguments format the format to check Return The bit-width of the format, or a negative error code if unknown format. Copyright
snd_pcm_format_unsigned – Check the PCM format is unsigned linear Synopsis int snd_pcm_format_unsigned(snd_pcm_format_t format); Arguments format the format to check Return 1 if the given PCM format is unsigned linear, 0 if signed linear, and a negative error code for non-linear formats. Copyright
snd_pcm_format_size – return the byte size of samples on the given format Synopsis ssize_t snd_pcm_format_size(snd_pcm_format_t format, size_t samples); Arguments format the format to check samples sampling rate Return The byte size of the given samples for the format, or a negative error code if unknown format. Copyright
snd_pcm_format_silence_64 – return the silent data in 8 bytes array Synopsis const unsigned char *snd_pcm_format_silence_64(snd_pcm_format_t format); Arguments format the format to check Return The format pattern to fill or NULL if error. Copyright
snd_pcm_format_signed – Check the PCM format is signed linear Synopsis int snd_pcm_format_signed(snd_pcm_format_t format); Arguments format the format to check Return 1 if the given PCM format is signed linear, 0 if unsigned linear, and a negative error code for non-linear formats. Copyright
snd_pcm_format_set_silence – set the silence data on the buffer Synopsis int snd_pcm_format_set_silence(snd_pcm_format_t format, void *data, unsigned int samples); Arguments format the PCM format data the buffer pointer samples the number of samples to set silence Description Sets the silence data on the buffer for the given samples. Return Zero if successful, or a negative error…
snd_pcm_format_physical_width – return the physical bit-width of the format Synopsis int snd_pcm_format_physical_width(snd_pcm_format_t format); Arguments format the format to check Return The physical bit-width of the format, or a negative error code if unknown format. Copyright
snd_pcm_format_name – Return a name string for the given PCM format Synopsis const char *snd_pcm_format_name(snd_pcm_format_t format); Arguments format PCM format Copyright
snd_pcm_format_little_endian – Check the PCM format is little-endian Synopsis int snd_pcm_format_little_endian(snd_pcm_format_t format); Arguments format the format to check Return 1 if the given PCM format is little-endian, 0 if big-endian, or a negative error code if endian not specified. Copyright
snd_pcm_format_linear – Check the PCM format is linear Synopsis int snd_pcm_format_linear(snd_pcm_format_t format); Arguments format the format to check Return 1 if the given PCM format is linear, 0 if not. Copyright
snd_pcm_format_cpu_endian – Check the PCM format is CPU-endian Synopsis int snd_pcm_format_cpu_endian(snd_pcm_format_t format); Arguments format the format to check Return 1 if the given PCM format is CPU-endian, 0 if opposite, or a negative error code if endian not specified. Copyright
snd_pcm_format_big_endian – Check the PCM format is big-endian Synopsis int snd_pcm_format_big_endian(snd_pcm_format_t format); Arguments format the format to check Return 1 if the given PCM format is big-endian, 0 if little-endian, or a negative error code if endian not specified. Copyright
snd_pcm_chmap_substream – get the PCM substream assigned to the given chmap info Synopsis struct snd_pcm_substream *snd_pcm_chmap_substream(struct snd_pcm_chmap *info, unsigned int idx); Arguments info chmap information idx the substream number index Copyright