==> 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...
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...
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_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_hw_params_get_period_size(params, &chunk_size,0);size_tn=chunk_size; snd_pcm_sw_params_set_avail_min(handle, swparams, n);snd_pcm_uframes_tstart_threshold, stop_threshold; start_threshold=22050; snd_pcm_sw_params_set_start_threshold(handle, swparams, start_threshold); ...
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:...
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...
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 ...
CHECK(snd_pcm_sw_params_set_start_threshold(pcm, sw_params, 12000)); CHECK(snd_pcm_sw_params_set_avail_min(pcm, sw_params, 6000)); CHECK(snd_pcm_sw_params(pcm, sw_params)); for (;;) { CHECK(snd_pcm_wait(pcm, 2000));
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。