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Linux 4.x ALSA基础讲义.pdf

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ALSA Advanced Linux Sound Architecture Bill.Wu@tymphany.com
Overview Audio playback and record Sound console # aplay music.wav # arecord voice.wav # alsamixer # amixer C Program API /usr/include/alsa/asoundlib.h snd_pcm_open snd_pcm_close snd_pcm_hw_params_set_xxx snd_pcm_writei snd_pcm_readi
Overview alsa-utils User Space alsa-lib alsa-plugins Kernel Space alsa-driver soc-core soc-dapm
Topic • soc-core • soc-dapm • alsa-plugins
soc-core Soc: System on Chip WiFi Video DDR Flash SoC Codec
soc-core PCB SoC I2C I2S-A I2S-B I2C I2C I2S-0 I2S-0 I2C DSP DSP A m p l i f i e r M i c r o p h o n e
soc-core PCB SoC I2S-A I2S-B I2S-0 DSP Codec I2S-0 DSP Codec Codec: An external IC with a set of registers controlled via I2C or SPI
soc-core PCB I2S-A SoCPlatform I2S-0 Codec Platform: SoC internal component. Copy audio data from DDR to I2S TX FIFO
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