==> 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", "...
pcmp,即打开的PCM设备句柄; name,要打开的PCM设备名称,默认defaultstream,对应的PCM流类型,播放PCM流(SND_PCM_STREAM_PLAYBACK)和录音PCM流(SND_PCM_STREAM_CAPTURE)mode,打开方式,阻塞、非阻塞及异步等snd_pcm_open通过调用snd_config_update_ref来获取als.conf中的配置信息,参数保存至snd_config_t 。通过snd_p...
==> 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", "...
...和alsa-utils。...使用方法:选项 功能 -D,–device 指定声卡设备, 默认使用 default -l,–list-devices 列出当前所有声卡 -t,–file-type 指定播放文件的格式, 如 voc,...使用方法:选项 功能 -D,–device 指定声卡设备, 默认使用 default -l,–list-devices 列出当前所有声卡 -t,–file-...
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,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...
Using "ALSA" audio driver with SexyAL's default device selection.ALSA Error: snd_pcm_open(&alsa_pcm, id ? id : "hw:0", SND_PCM_STREAM_PLAYBACK, 0) 没有那个文件或目录 分享10赞 树莓派吧 流天赋😁 树莓派espeak库语音播报报错Expression 'PaAlsaStreamComponent_InitialConfigure( &self->...
The application crashes when I try to raise the notification volume: thread 'thread_play_sound' panicked at 'called `Result::unwrap()` on an `Err` value: DefaultStreamConfigError(BackendSpecific { err: BackendSpecificError { description:...
Do you run the commands as the same user? The user with which it works might have an.asoundrcfile that sets the default device to listen to. My systemd unit file is also just [Unit] Description=cpiped After=network.target snapserver.service [Service] Type=simple User=root ExecStart=/root...
这里存在的问题,我们并不是是对这些设备节点进行访问来进行录音及播放,而是采用例如 default 或者 plughw:0,0 等作为参数,而这些具体对应哪个物理设备,是不是我们期望的设备?这就又增加了一层不友好的屏蔽。 例如在参考资料3)中的例程中,默认打开default设备,在x86虚拟机上运行正常;但是交叉编译到arm嵌入式环境就不...
intset_pcm(){intrc;intdir =0;intrate =44100;;/* ??? 44.1KHz*/intformat = SND_PCM_FORMAT_S16_LE;/* ??? 16 */intchannels =2;/* ??? 2 */rc =snd_pcm_open(&handle,"default", SND_PCM_STREAM_PLAYBACK,0);if(rc <0) { ...