但仍在snd_pcm_writei上运行不足EN腾讯数码讯 苹果在WWDC 2017开发者大会上发布了ARKit套件，已经正式...
当我们以非常小的缓冲区大小运行时，声卡应该非常快地处理传入缓冲区的数据，否则就溢出overrun了。有些...
This adds a virtio based sound card device that provides output and input PCM streams to a virtual guest. In order to build the virtio-snd device the VIRTIO_SND configuration option should be enabled in the hw/audio/Kconfig file. The device can be provided to a guest using the following ...
Linux ALSA声卡驱动之三 PCM设备的创建 。图2.1 声卡中的pcm结构在嵌入式系统中,通常不会像图2.1中这么复杂,大多数情况下是一个声卡,一个pcm实例,pcm下面有一个playback stream和capture stream...runtime字段则指向snd_pcm_runtime结构,snd_pcm_runtime记录这substream的一些重要的软件和硬件运行环境和参数。
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. ...
I guess the runtime of jackd received failure by call of ioctl with SNDRV_PCM_IOCTL_HW_PARAMS request. Typically, the error code is -ETIMEDOUT. Would I ask you to test jackd with strace(1) command and gather logs? The command line should be: $ strace -tt -f jackd -v -P25 -dalsa...
Thanx for the response James, but still the problem persists. As an alternative, i tried using capture and playback in different time intervals, instead of full duplex eventhough in my 2nd call to snd_pcm_hw_params() i'm getting this ...
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 ...
/* Stop DMA */ snd_es18xx_mixer_write(chip, 0x78, 0x00); #ifdef AVOID_POPS - udelay(25000); + mdelay(25); if (chip->caps & ES18XX_PCM2) /* Set Audio 2 volume to 0 */ snd_es18xx_mixer_write(chip, 0x7C, 0);
PCM Interface (/dev/snd/pcmCXDX) Raw MIDI Interface (/dev/snd/midiCXDX) Sequencer Interface (/dev/snd/seq) Timer Interface (/dev/snd/timer 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...