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那么这里对应"empty" static const char *const build_in_pcms[] = { "adpcm", "alaw", "copy...
==> snd_pcm_new(&pcm, SND_PCM_TYPE_HW, name, info.stream, mode); pcm->ops = &snd_pcm_hw_ops; 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_p...
snd_pcm_start(pcm); } }return0; } 开发者ID:AlexRu,项目名称:rosa-media-player,代码行数:26,代码来源:midiplayerthread.cpp 示例2: snd_pcm_file_hw_params ▲点赞 5▼ staticintsnd_pcm_file_hw_params(snd_pcm_t*pcm,snd_pcm_hw_params_t* params){snd_pcm_file_t*file = pcm->private_dat...
snd_pcm_avail_update(speaker_handle)) {//printf("Speaker Waiting\n");usleep(PERIOD_UTIME*2);//wait to reduce CPU usagecontinue;//don't start yet}else{if(!started) snd_pcm_prepare(speaker_handle);//reset speakerstarted =1;//indicate that we've startd}//write data to speaker buffer,...
thread 'thread_play_sound' panicked at 'called `Result::unwrap()` on an `Err` value: DefaultStreamConfigError(BackendSpecific { err: BackendSpecificError { description: "ALSA function 'snd_pcm_open' failed with error 'EHOSTDOWN: Host is down'" } })', src/notifications/types/sound.rs:...
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...
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...
标准的snd_soc_ops回调 通常由asoc core在进行PCM操作时调用 startup shutdown hw_params hw_free prepare trigger 降低pop音,由asoc-core调用 digital_mute soc-dai.h文件里定义的下面函数,通常在machine驱动 struct snd_soc_ops接口的hw_params()函数里 被调用,接收struct snd_soc_dai 实例参数。
在程序软件里，有些情况下会用到声音提示，一般会使用文字转成语音，然后使用软件播放出来，QT框架里QSound类提供了一种播放.wav声音文件的方法，播放WAV格式文件非常方便，WAV格式没有压缩，播放MP3之类的还要解压，额外需要解码库，如何程序只是要一些提示音，就可以使用WAV格式文件，使用QSound的play静态函数进行异步...
int (*prepare)(struct snd_pcm_substream *,struct snd_soc_dai *);/* * NOTE: Commands passed to the trigger function are not necessarily * compatible with the current state of the dai. For example this * sequence of commands is possible: START STOP STOP.* So do not unconditionally use ...