The ALSA Driver API
PrevChapter 2. PCM APINext

PCM Memory Management

Table of Contents
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.
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snd_pcm_limit_hw_ratesUpsnd_pcm_lib_preallocate_free_for_all