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filename等于"/dev/snd/pcmC0D0p" ==> fd = snd_open_device(filename, fmode); ==> return snd_pcm_hw_open_fd(pcmp, name, fd, 0, sync_ptr_ioctl); ==> snd_pcm_new(&pcm, SND_PCM_TYPE_HW, name, info.stream, mode); pcm->ops = &snd_pcm_hw_ops; pcm->fast_ops = &snd_...
filename等于"/dev/snd/pcmC0D0p" ==> fd = snd_open_device(filename, fmode); ==> return snd_pcm_hw_open_fd(pcmp, name, fd, 0, sync_ptr_ioctl); ==> snd_pcm_new(&pcm, SND_PCM_TYPE_HW, name, info.stream, mode); pcm->ops = &snd_pcm_hw_ops; pcm->fast_ops = &snd_...
filename等于"/dev/snd/pcmC0D0p" ==> fd = snd_open_device(filename, fmode); ==> return snd_pcm_hw_open_fd(pcmp, name, fd, 0, sync_ptr_ioctl); ==> snd_pcm_new(&pcm, SND_PCM_TYPE_HW, name, info.stream, mode);
int snd_pcm_hw_open_fd(snd_pcm_t **pcmp, const char *name, int fd, int sync_ptr_ioctl) ret = snd_pcm_new(&pcm, SND_PCM_TYPE_HW, name, info.stream, mode); ... // 配置回调接口 pcm->ops = &snd_pcm_hw_ops; pcm->fast_ops = &snd_pcm_hw_fast_ops; pcm->private_data...
==> snd_pcm_new snd_soc_new_pcms snd_card_create snd_ctl_create snd_ctl_dev_register创建"controlC%i"声卡对应的控制节点, 他的fops为snd_ctl_f_ops snd_pcm_dev_register snd_register_device_for_dev 创建"pcmC%iD%ip"或者"pcmC%iD%ic"设备节点,它的fops为snd_pcm_f_ops[2] ...
ALSA driver --PCM 实例创建过程 2016-12-21 19:26 −前面已经写过PCM 实例的创建框架,我们现在来看看PCM 实例是如何创建的。 在调用snd_pcm_new时就会创建一个snd_pcm类型的PCM 实例. struct snd_pcm { struct snd_card *card;//PCM device 说挂载的声卡 struct list... ...
==> snd_pcm_new snd_soc_new_pcms snd_card_create snd_ctl_create snd_ctl_dev_register创建"controlC%i"声卡对应的控制节点, 他的fops为snd_ctl_f_ops snd_pcm_dev_register snd_register_device_for_dev 创建"pcmC%iD%ip"或者"pcmC%iD%ic"设备节点,它的fops为snd_pcm_f_ops[2] ...
问alsa snd_pcm_writeiEN我注意到pcm.c和speaker-test.c中的正弦生成器在循环中生成一个新的正弦缓冲...