snd_pcm_set_appl_ptr(pcm, &hw->mmap_control->appl_ptr, hw->fd, SNDRV_PCM_MMAP_OFFSET_CONTROL); return 0; } snd_pcm_mmap switch (i->type) { case SND_PCM_AREA_MMAP: // 表示为数据区分配驱动内存,在snd_pcm_hw_channel_info中设置了type ptr = mmap(NULL, size, PROT_READ|PROT_WRIT...
==> 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", "...
==> snd_pcm_open_conf(pcmp, name, root, conf, stream, mode); ==> open_func = snd_dlobj_cache_lookup(open_name);将获得lib库中_snd_pcm_empty_open函数 所以open_func将等于_snd_pcm_empty_open _snd_pcm_empty_open _snd_pcm_asym_open _snd_pcm_plug_open _snd_pcm_softvol_open _snd...
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if (!strcmp(uevent->action,"add") || !strcmp(uevent->action, "change") || !strcmp(uevent->action, "online")) fixup_sys_perms(uevent->path); if (!strncmp(uevent->subsystem, "block", 5)) { handle_block_device_event(uevent); } else if (!strncmp(uevent->subsystem, "platform", ...
==> 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", "...
machine driver的probe函数会调用此api向Alsa注册声卡 1 int snd_soc_register_card(struct snd_soc_card *card) 2 { 3 int i, ret; 4 struct snd_soc_pcm_runtime *rtd; 5 6
Due to hardware design, the function of DSP can not be configured unless an ALSA PCM application initiates isochronous communication. snd-firewire-tascam-ctl-service Due to hardware design, most controls are not synchronized to hardware expectedly unless an ALSA PCM application initiates isochronous co...
P.S. I was mistaken, the doc does in fact define arg 3 as 'pointer to int' and describes the action. The return value is the only problem. Jaroslav Kysela wrote: On Mon, 1 Mar 2004, Doug McLain wrote: According to the alsa documentation, the return value of snd_hw_params_set_rat...