高通音频驱动录音流程（五)

高通音频驱动录音流程（五)
mixer path 设置过程分析

snd_soc_register_card

录音通路配置
调用tinycap命令时的音频播放流程

网上关于音频驱动的文章，大多是进行框架性的介绍，关于音频驱动控件的配置及录音播放介绍的很少，下面就已高通sm6350的mic通路配置及录音的配置，进行音频驱动流程的介绍。

录音通路配置

/* 下面这三个是对swr侧进行配置 */
tinymix "TX DEC1 MUX" "SWR_MIC"
tinymix "TX SMIC MUX1" "ADC0"
tinymix "TX_AIF1_CAP Mixer DEC1" "1"
/* Enables soundwire slave device data path */
tinymix "ADC1_MIXER Switch" "1"
/* 配置DMA的channel及bolero的音量增益 */
tinymix "TX_CDC_DMA_TX_3 Channels" "One"
tinymix "TX_DEC1 Volume" "80"
/* 将fe与be连接，其中MultiMedia1对应的时deep buffer playback */
tinymix "MultiMedia1 Mixer TX_CDC_DMA_TX_3" "1"

调用tinycap命令时的音频播放流程

tinycap /sdcard/Music/test.wav -c 1 -r 48000 -b 16 -T 10

pcm->fd = open(fn, O_RDWR|O_NONBLOCK);snd_opensnd_pcm_capture_opensnd_pcm_opensnd_pcm_open_filesnd_pcm_open_substreamsubstream->ops->open(substream))dpcm_fe_dai_opendpcm_fe_dai_startupdpcm_be_dai_startupsoc_pcm_opencpu_dai->driver->ops->startup(substream, cpu_dai)component->driver->ops->open(substream)codec_dai->driver->ops->startup(substream, codec_dai)rtd->dai_link->ops->startup(substream);
ioctl(pcm->fd, SNDRV_PCM_IOCTL_INFO, &info))snd_pcm_ioctlsnd_pcm_common_ioctlsnd_pcm_info_usersnd_pcm_info
ioctl(pcm->fd, SNDRV_PCM_IOCTL_HW_PARAMS, &params)snd_pcm_ioctlsnd_pcm_common_ioctlsnd_pcm_hw_params_usersnd_pcm_hw_paramssubstream->ops->hw_params(substream, params);dpcm_fe_dai_hw_paramsdpcm_be_dai_hw_paramsrtd->dai_link->be_hw_params_fixup(rtd, params)rtd->dai_link->ops->hw_params(substream, params)soc_dai_hw_params(substream, &codec_params, codec_dai)soc_dai_hw_params(substream, params, cpu_dai)rtd->dai_link->be_hw_params_fixup(rtd, params)dai->driver->ops->hw_params(substream, params, dai)component->driver->ops->hw_params(substream, params)ioctl(pcm->fd, SNDRV_PCM_IOCTL_SW_PARAMS, &sparams)snd_pcm_ioctlsnd_pcm_common_ioctlsnd_pcm_sw_params_usersnd_pcm_sw_params
ioctl(pcm->fd, SNDRV_PCM_IOCTL_PREPARE)snd_pcm_ioctlsnd_pcm_common_ioctlsnd_pcm_preparesnd_pcm_action_nonatomicsnd_pcm_action_preparesubstream->ops->prepare(substream)dpcm_fe_dai_preparedpcm_be_dai_preparesoc_pcm_preparertd->dai_link->ops->prepare(substream)component->driver->ops->prepare(substream)codec_dai->driver->ops->prepare(substream, codec_dai)cpu_dai->driver->ops->prepare(substream, cpu_dai)dai->driver->ops->mute_stream(dai, mute, direction)
ioctl(pcm->fd, SNDRV_PCM_IOCTL_START)snd_pcm_ioctlsnd_pcm_common_ioctlsnd_pcm_start_lock_irqsnd_pcm_action_lock_irqsnd_pcm_action_startsubstream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START)dpcm_fe_dai_triggerdpcm_fe_dai_do_triggerdpcm_dai_trigger_fe_bedpcm_be_dai_triggersoc_pcm_triggercodec_dai->driver->ops->trigger(substream, cmd, codec_dai)                                 cmponent->driver->ops->trigger(substream, cmd)cpu_dai->driver->ops->trigger(substream, cmd, cpu_dai)rtd->dai_link->ops->trigger(substream, cmd)ioctl(pcm->fd, SNDRV_PCM_IOCTL_READI_FRAMES, &x)snd_pcm_ioctlsnd_pcm_common_ioctlsnd_pcm_xferi_frames_ioctlsnd_pcm_lib_read__snd_pcm_lib_xfer

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高通音频驱动录音流程（五)

snd_soc_register_card

录音通路配置

调用tinycap命令时的音频播放流程

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