{snd_pcm_t* pcm_handle;snd_pcm_hw_params_t* hwparams;snd_pcm_uframes_tbuffersize_return;unsignedinttmp;interr;std::unique_ptr<PCMHandle> spPCMHandle {newPCMHandle {spSettings_->pcmName_, SND_PCM_STREAM_CAPTURE}}; QObject::connect (spPCMHandle.get(), &PCMThread::PCMHandle::sigDebug...
打开PCM设备 设置硬件参数 读/写数据 PCM播放示例代码 PCM录音示例代码 使用异步方法 snd_async_add_pcm_handler()函数 snd_pcm_avail_update()函数 PCM异步播放示例 PCM异步录音示例 使用poll()函数 使用poll I/O多路复用实现读写 PCM播放示例 PCM录音示例 PCM设备状态 PCM播放——加入状态控制 snd_pcm_readi/...
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...
snd_pcm_hw_params_t *pcm_params; // 分配 PCM 参数结构 err = snd_pcm_hw_params_malloc(&pcm_params); // 检查参数结构分配是否成功 if (err < 0) { fprintf(stderr, "Error allocating PCM parameters: %s\n", snd_strerror(err)); exit(EXIT_FAILURE); } ``` ### 步骤 3:初始化 PCM ...
printf("Read %d bytes of audio data\n",nread); } } snd_pcm_hw_params_free(params);// 释放参数结构体内存空间 snd_pcm_close(handle);// 关闭PCM设备 returnEXIT_SUCCESS; } 希望这个程序能够帮助你实现简单的PCM设备录音功能。 收藏| 0点赞 | 0打赏...
PCM硬件参数,这是一个成员不公开的结构: typedefstruct_snd_pcm_hw_paramssnd_pcm_hw_params_t; PCM的流类型,主要指播放和录音两种: /** PCM stream (direction) */typedefenum_snd_pcm_stream{/** Playback stream */SND_PCM_STREAM_PLAYBACK=0,/** Capture stream */SND_PCM_STREAM_CAPTURE,SND_PCM...
.open = soc_pcm_open, .close = soc_codec_close, .hw_params = soc_pcm_hw_params, .hw_free = soc_pcm_hw_free, .prepare = soc_pcm_prepare, .trigger = soc_pcm_trigger, }; ==> soc_pcm_open cpu_dai->ops->startup // 无 ...
==> soc_pcm_open /* ASoC PCM operations */ static struct snd_pcm_ops soc_pcm_ops = { .open = soc_pcm_open, .close = soc_codec_close, .hw_params = soc_pcm_hw_params, .hw_free = soc_pcm_hw_free, .prepare = soc_pcm_prepare, ...
static int snd_pcm_open_conf(snd_pcm_t **pcmp, const char *name, snd_config_t *pcm_root, snd_config_t *pcm_conf, snd_pcm_stream_t stream, int mode){...sprintf(buf, "_snd_pcm_%s_open", str); //open_name即“_snd_pcm_hw_open”...const char *const *build_in = build_in...
/* ASoC PCM operations */ static struct snd_pcm_ops soc_pcm_ops = { .open = soc_pcm_open, .close = soc_codec_close, .hw_params = soc_pcm_hw_params, .hw_free = soc_pcm_hw_free, .prepare = soc_pcm_prepare, .trigger = soc_pcm_trigger, ...