static struct snd_pcm_ops soc_pcm_ops = { .open = soc_pcm_open, .close = soc_codec_close, .hw_params = soc_pcm_hw_params, .hw_free = soc_pcm_hw_free, .prepare = soc_pcm_prepare, .trigger = soc_pcm_trigger, .pointer = soc_pcm_pointer, }; static int soc_new_pcm(struct ...
一,虚拟机内部声音导出到本地宿主机内 主要是针对qemu虚拟机下的音频如何使用,首先要查看help命令: qemu-system-x86_64 -audio-help 1. 这个命令能告诉我们audio的一些基本的信息和使用方法,以及Qemu支持的驱动 Audio options: QEMU_AUDIO_DAC_FIXED_SETTINGS: boolean, default = 1 Use fixed settings for host ...
staticstructsnd_pcm_opssoc_pcm_ops={ .open =soc_pcm_open, .close =soc_codec_close, .hw_params =soc_pcm_hw_params, .hw_free =soc_pcm_hw_free, .prepare =soc_pcm_prepare, .trigger =soc_pcm_trigger, .pointer =soc_pcm_pointer, ...
其中的 音频数据流向图 就是 dpam 中 流向图 snd_pcm_ops的更多描述
==> 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] ...
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] snd_pcm_f_ops[2] ==> snd_pcm_playback_open或者snd_pcm_capture_open ==> snd_pcm_open或者oss的snd_pcm_oss_f_reg.snd_pcm_oss_open,这就对应/dev/dsp了 ...
pcm->fast_ops = &snd_pcm_hw_fast_ops; static int snd_pcm_hw_mmap_control(snd_pcm_t *pcm) { snd_pcm_hw_t *hw = pcm->private_data; void *ptr; int err; if (hw->sync_ptr == NULL) { // 如果还没有mmap,那么执行mmap映射内核空间驱动使用的声音缓冲区 ...
Item: PCM [dB gain: 0.00, -0.40] with a single bar <100>PCM<100> for playback, and nothing else... I'm at a bit of a loss to know what is going wrong (or perhaps what I'm doing wrong) or what I should do next Any thoughts would be appreciated n patch_cs8409.h.rej.txt...
==> soc_new_pcm ==> 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...
==> soc_new_pcm ==> 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...