snd_pcm_open通过调用snd_config_update_ref来获取als.conf中的配置信息,参数保存至snd_config_t 。通过snd_pcm_open_noupdate 解析 snd_config_t 配置,snd_pcm_open_noupdate 函数原型如下static int snd_pcm_open_noupdate(snd_pcm_t **pcmp, snd_config_t *root, const char *name, snd_pcm_stream_t ...
staticintset_hwparams(snd_pcm_t*handle,snd_pcm_hw_params_t*params,snd_pcm_access_taccess){interr, dir;/* choose all parameters */err = snd_pcm_hw_params_any(handle,params);if(err <0) {printf("Access type not available for playback: %s\n", snd_strerror(err));returnerr; }/* set...
staticintbcm947xx_pcm_set_constraints(struct snd_pcm_runtime *runtime,bcm947xx_i2s_info_t*snd_bcm){intret;/* rate */if((ret =snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE, snd_bcm->rate, snd_bcm->rate)) <0) { DBG("%s SNDRV_PCM_HW_PARAM_RATE failed rate=%d...
snd_pcm_hw_constraint_step函数用于创建一个硬件约束集合,并指定一个步骤函数,用于在约束集合中逐步应用约束。这个函数通常与其他函数组合使用,例如snd_pcm_hw_constraint_mask、snd_pcm_hw_constraint_minmax等,来设置特定的硬件属性。 函数原型为:int snd_pcm_hw_constraint_step(snd_pcm_hw_constraint_t *constra...
==> 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_mmap_control(snd_pcm_t *pcm) { snd_pcm...
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==> 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_mmap_control(snd_pcm_t *pcm) { snd_pcm...
snd_kcontrol_info_t *info; 18. snd_kcontrol_get_t *get; 19. snd_kcontrol_put_t *put; 20. union { 21. snd_kcontrol_tlv_rw_t *c; 22. const unsigned int *p; 23. } tlv; 24. unsigned long private_value; 25. }; TLV:具体指的是什么? 是 Tag,Length,Value(标记、长度、值) 吗?
Oct 29 20:44:10 raspberrypi snapclient[1516]: snd_pcm_avail and snd_pcm_delay failed: Broken pipe, avail: -32, delay: 1016 Oct 29 20:44:11 raspberrypi snapclient[1516]: snd_pcm_avail_delay failed: Broken pipe, avail: 6000, delay: 6000, retrying. ...
snd_kcontrol_tlv_rw_t *c; constunsignedint*p; } tlv; unsignedlongprivate_value; }; iface字段 定义了control的类型,形式为SNDRV_CTL_ELEM_IFACE_XXX,对于mixer是SNDRV_CTL_ELEM_IFACE_MIXER,对于不属于mixer的全局控制,使用CARD;如果关联到某类设备,则是PCM、RAWMIDI、TIMER或SEQUENCER。在这里,我们主要关注...