snd_pcm_open_conf 调用snd_dlobj_cache_get在动态库中libasound_module_pcm_hw.so获取函数指针_snd_pcm_hw_open_snd_pcm_hw_open通过调用snd_pcm_hw_open来创建hw_pcm设备。snd_pcm_hw_open函数原型如下int snd_pcm_hw_open(snd_pcm_t **pcmp, const char *name, int card, int device, int subdevic...
/* prepare callback */staticintsnd_bcm2835_pcm_prepare(struct snd_pcm_substream *substream){structbcm2835_chip*chip=snd_pcm_substream_chip(substream);structsnd_pcm_runtime*runtime=substream->runtime;structbcm2835_alsa_stream*alsa_stream=runtime->private_data;intchannels;interr; audio_info("...
struct snd_pcm_hw_params *params){structsnd_soc_pcm_runtime*rtd=substream->private_data;structdevice*dev=rtd->platform->dev;structdma_chan*chan;structtegra_pcm_dma_params*dmap;structdma_slave_configslave_config;intret;if(rtd->dai_link->no_pcm)return0; chan = snd_dmaengine_pcm_get_chan...
filename等于"/dev/snd/pcmC0D0p" ==> fd = snd_open_device(filename, fmode); ==> return snd_pcm_hw_open_fd(pcmp, name, fd, 0, sync_ptr_ioctl); ==> snd_pcm_new(&pcm, SND_PCM_TYPE_HW, name, info.stream, mode); pcm->ops = &snd_pcm_hw_ops; pcm->fast_ops = &snd_...
==> fd = snd_open_device(filename, fmode); ==> return snd_pcm_hw_open_fd(pcmp, name, fd, 0, sync_ptr_ioctl); ==> 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; ...
filename等于"/dev/snd/pcmC0D0p" ==> fd = snd_open_device(filename, fmode); ==> return snd_pcm_hw_open_fd(pcmp, name, fd, 0, sync_ptr_ioctl); ==> snd_pcm_new(&pcm, SND_PCM_TYPE_HW, name, info.stream, mode); pcm->ops = &snd_pcm_hw_ops; pcm->fast_ops = &snd_...
(&config);letmutc:StreamConfig= config.into();// c.buffer_size = BufferSize::Fixed(64);letstream = device.build_output_stream(&c,move|_:&mut[f32],_:&cpal::OutputCallbackInfo|{},move|_|{},).unwrap();stream.play().unwrap();}...
pcmC0D0p= fd = snd_open_device(filename, fmode);= return snd_pcm_hw_open_fd(pcmp, name, fd, 0, sync_ptr_ioctl);= 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_...
INFO("kernel logger is deprecated\n"); base="/dev/log/"; make_dir(base, 0755); name += 4; }else base="/dev/"; links = get_character_device_symlinks(uevent); if(!devpath[0]) snprintf(devpath,sizeof(devpath),"%s%s",base, name); ...
<1>RIP [<ffffffff882ebf3b>] :snd_pcm:snd_pcm_attach_substream+0x80/0x2d9 <4> RSP <ffff8101f4707d38> <0>CR2: 0000000000100100 Some processes that require the sound device gets blocked with following call traces: Raw <4> <3>INFO: task sox:21312 blocked for more than 120 seconds....