Chapter 22. Sound Devices
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## Chapter 22. Sound Devices

Table of Contents

snd_register_device — Register the ALSA device file for the card
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
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
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_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_for_dev — 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_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_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 —
snd_pcm_hw_param_first —
snd_pcm_hw_param_last —
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

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