Chapter 22. Sound Devices

Table of Contents

snd_printk - printk wrapper
snd_printd - debug printk
snd_assert - run-time assertion macro
snd_printdd - debug printk
register_sound_special_device - register a special sound node
register_sound_mixer - register a mixer device
register_sound_midi - register a midi device
register_sound_dsp - register a DSP device
register_sound_synth - register a synth device
unregister_sound_special - unregister a special sound device
unregister_sound_mixer - unregister a mixer
unregister_sound_midi - unregister a midi device
unregister_sound_dsp - unregister a DSP device
unregister_sound_synth - unregister a synth device
snd_pcm_playback_ready - check whether the playback buffer is available
snd_pcm_capture_ready - check whether the capture buffer is available
snd_pcm_playback_data - check whether any data exists on the playback buffer
snd_pcm_playback_empty - check whether the playback buffer is empty
snd_pcm_capture_empty - check whether the capture buffer is empty
snd_pcm_format_cpu_endian - Check the PCM format is CPU-endian
snd_pcm_new_stream - create a new PCM stream
snd_pcm_new - create a new PCM instance
snd_device_new - create an ALSA device component
snd_device_free - release the device from the card
snd_device_register - register the device
snd_iprintf - printf on the procfs buffer
snd_info_get_line - read one line from the procfs buffer
snd_info_get_str - parse a string token
snd_info_create_module_entry - create an info entry for the given module
snd_info_create_card_entry - create an info entry for the given card
snd_card_proc_new - create an info entry for the given card
snd_info_free_entry - release the info entry
snd_info_register - register the info entry
snd_info_unregister - de-register the info entry
snd_rawmidi_receive - receive the input data from the device
snd_rawmidi_transmit_empty - check whether the output buffer is empty
snd_rawmidi_transmit_peek - copy data from the internal buffer
snd_rawmidi_transmit_ack - acknowledge the transmission
snd_rawmidi_transmit - copy from the buffer to the device
snd_rawmidi_new - create a rawmidi instance
snd_rawmidi_set_ops - set the rawmidi operators
snd_request_card - try to load the card module
snd_lookup_minor_data - get user data of a registered device
snd_register_device - Register the ALSA device file for the card
snd_unregister_device - unregister the device on the given card
copy_to_user_fromio - copy data from mmio-space to user-space
copy_from_user_toio - copy data from user-space to mmio-space
snd_pcm_lib_preallocate_free_for_all - release all pre-allocated buffers on the pcm
snd_pcm_lib_preallocate_pages - pre-allocation for the given DMA type
snd_pcm_lib_preallocate_pages_for_all - pre-allocation for continous memory type (all substreams)
snd_pcm_sgbuf_ops_page - get the page struct at the given offset
snd_pcm_lib_malloc_pages - allocate the DMA buffer
snd_pcm_lib_free_pages - release the allocated DMA buffer.
snd_card_new - create and initialize a soundcard structure
snd_card_disconnect - disconnect all APIs from the file-operations (user space)
snd_card_free - frees given soundcard structure
snd_card_free_in_thread - call snd_card_free in thread
snd_card_register - register the soundcard
snd_component_add - add a component string
snd_card_file_add - add the file to the file list of the card
snd_card_file_remove - remove the file from the file list
snd_power_wait - wait until the power-state is changed.
snd_dma_program - program an ISA DMA transfer
snd_dma_disable - stop the ISA DMA transfer
snd_dma_pointer - return the current pointer to DMA transfer buffer in bytes
snd_ctl_new - create a control instance from the template
snd_ctl_new1 - create a control instance from the template
snd_ctl_free_one - release the control instance
snd_ctl_add - add the control instance to the card
snd_ctl_remove - remove the control from the card and release it
snd_ctl_remove_id - remove the control of the given id and release it
snd_ctl_rename_id - replace the id of a control on the card
snd_ctl_find_numid - find the control instance with the given number-id
snd_ctl_find_id - find the control instance with the given id
snd_pcm_set_ops - set the PCM operators
snd_pcm_set_sync - set the PCM sync id
snd_interval_refine - refine the interval value of configurator
snd_interval_ratnum - refine the interval value
snd_interval_list - refine the interval value from the list
snd_pcm_hw_rule_add - add the hw-constraint rule
snd_pcm_hw_constraint_integer -
snd_pcm_hw_constraint_minmax -
snd_pcm_hw_constraint_list -
snd_pcm_hw_constraint_ratnums -
snd_pcm_hw_constraint_ratdens -
snd_pcm_hw_constraint_msbits -
snd_pcm_hw_constraint_step -
snd_pcm_hw_constraint_pow2 -
snd_pcm_hw_param_value_min -
snd_pcm_hw_param_value_max -
snd_pcm_hw_param_first -
snd_pcm_hw_param_last -
snd_pcm_hw_param_set -
snd_pcm_hw_param_mask -
snd_pcm_hw_param_near -
snd_pcm_lib_ioctl - a generic PCM ioctl callback
snd_pcm_period_elapsed - update the pcm status for the next period
snd_hwdep_new - create a new hwdep instance
snd_pcm_stop -
snd_pcm_suspend -
snd_pcm_suspend_all -
snd_malloc_pages - allocate pages with the given size
snd_free_pages - release the pages
snd_dma_alloc_pages - allocate the buffer area according to the given type
snd_dma_alloc_pages_fallback - allocate the buffer area according to the given type with fallback
snd_dma_free_pages - release the allocated buffer
snd_dma_get_reserved_buf - get the reserved buffer for the given device
snd_dma_reserve_buf - reserve the buffer