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_f_ops[2] ==> snd_pcm_playback_open或者...
如果你希望在Linux C中实现对/dev/snd/pcmC0D0c声卡的录音功能,而且不依赖于外部库,可以使用以下代码: #include<stdio.h> #include<fcntl.h> #include<unistd.h> #include<sys/ioctl.h> #include<linux/soundcard.h> #defineDEVICE"/dev/snd/pcmC0D0c"// 设备文件路径 #defineBUFFER_SIZE4096 intmain(){...
==> snd_pcm_open(&handle, pcm_name, stream, open_mode); //打开一路pcm,刷新config配置 如果是"default",同时type等于SND_CONFIG_TYPE_COMPOUND那么这里对应"empty" static const char *const build_in_pcms[] = { "adpcm", "alaw", "copy", "dmix", "file", "hooks", "hw", "ladspa", "...
alsa声卡/dev/snd/pcmC0D0p的open打开流程原文地址:/space.php?uid=20564848&do=blog&cuid=2116725aplay.c= main= snd_pcm_open(&handle, pcm_name, stream, open_mode); / 打开一路pcm,刷新config配置如果是default,同时type等于SND_CONFIG_TYPE_COMPOUND那么这里对应emptystatic const char *const build_in...
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_open(&handle, pcm_name, stream, open_mode); //打开一路pcm,刷新config配置 如果是"default",同时type等于SND_CONFIG_TYPE_COMPOUND那么这里对应"empty" static const char *const build_in_pcms[] = { "adpcm", "alaw", "copy", "dmix", "file", "hooks", "hw", "ladspa", "...
base="/dev/snd/";//snd在这里创建 make_dir(base, 0755); }elseif(!strncmp(uevent->subsystem,"misc", 4) && !strncmp(name,"log_", 4)) { INFO("kernel logger is deprecated\n"); base="/dev/log/"; make_dir(base, 0755);
printf("Read %d bytes of audio data\n",nread); } } snd_pcm_hw_params_free(params);// 释放参数结构体内存空间 snd_pcm_close(handle);// 关闭PCM设备 returnEXIT_SUCCESS; } 希望这个程序能够帮助你实现简单的PCM设备录音功能。 收藏| 0点赞 | 0打赏...
==> snd_pcm_open或者oss的snd_pcm_oss_f_reg.snd_pcm_oss_open,这就对应/dev/dsp了 ==> snd_pcm_open_file或者oss的snd_pcm_oss_open_file ==> snd_pcm_open_substream ==> soc_pcm_open /* ASoC PCM operations */ static struct snd_pcm_ops soc_pcm_ops = { ...
alsa声卡/dev/snd/pcmC0D0p的open打开流程 原文地址:http://blog.chinaunix.net/space.php?uid=20564848&do=blog&cuid=2116725(http:\/\/blog.chinaunix.net\/space.php?uid=20564848&do=blog&cuid=2116725) aplay.c ==>main ==>snd_pcm_open(&handle,pcm_name,stream,ope...