调用snd_pcm_hw_params_any()对snd_pcm_hw_params_t对象进行初始化操作,调用该函数会使用PCM设备当前的配置参数去初始化snd_pcm_hw_params_t对象,如下所示: snd_pcm_hw_params_any(pcm_handle, hwparams); 第一个参数为PCM设备的句柄,第二个参数传入snd_pcm_hw_params_t对象的指针。 硬件参数设置 alsa-...
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_STREAM_LAST=SND_PCM_STREAM_CAPTURE}snd_...
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 ...
虽然都是linux，芯片也是基于同样的架构，同样的指令集，但是考虑到芯片的实现毕竟是不同的，于是所有涉及...
snd_pcm_hw_params_set_buffer_size()是一个函数,用于设置音频设备的缓冲区大小。它属于ALSA(Advanced Linux Sound Architecture)音频...
if(snd_pcm_hw_params_any(handle,params)!=0){// 初始化参数结构体 fprintf(stderr,"Can't initialize hardware parameter structure\n"); exit(EXIT_FAILURE); } unsignedintrate=44100;// 设置采样率为44100Hz intdir; if(snd_pcm_hw_params_set_rate_near(handle,params,&rate,&dir)!=0){// 设置...
snd_pcm_hw_params_malloc( ) 在栈中分配 snd_pcm_hw_params_t 结构的空间,然后使用 snd_pcm_hw_params_any( ) 函数用声卡的全配置空间参数初始化已经分配的 snd_pcm_hw_params_t 结构。snd_pcm_hw_params_set_access ( ) 设置访问类型,常用访问类型的宏定义有: ...
CHECK(snd_pcm_open(&pcm, argv[1], SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK)); snd_pcm_hw_params_alloca(&hw_params); CHECK(snd_pcm_hw_params_any(pcm, hw_params)); CHECK(snd_pcm_hw_params_set_access(pcm, hw_params, SND_PCM_ACCESS_RW_INTERLEAVED)); ...
thread 'main' panicked at 'called `Result::unwrap()` on an `Err` value: BackendSpecific { err: BackendSpecificError { description: "ALSA function 'snd_pcm_hw_params_set_buffer_size' failed with error 'EINVAL: Invalid argument'" } }', src/main.rs:25:10 ...
First, snd_pcm_hw_params_get_period_size should be called after set hw params finish. Second,memory leak can cause when the format is IMA ADPCM. xree(decoded_data) should be called. ghostassignedawakecodingJun 17, 2013 bmiklautzremoved this from the1.1milestoneMay 25, 2016 ...