snd_pcm_set_params

snd_pcm_set_params()函数用于设置PCM流的参数。它的语法如下：

int snd_pcm_set_params(snd_pcm_t *pcm, snd_pcm_format_t format, snd_pcm_access_t access, unsigned int channels, unsigned int rate, int soft_resample, unsigned int latency);

其中，参数pcm是PCM句柄，format是采样格式，access是访问类型，channels是通道数，rate是采样率，soft_resample是软件重采样标志，latency是延迟时间。

以下是一个使用snd_pcm_set_params()函数的例子：

snd_pcm_hw_params_t *hw_params;
snd_pcm_hw_params_alloca(&hw_params);
snd_pcm_hw_params_any(pcm_handle, hw_params);
snd_pcm_hw_params_set_access(pcm_handle, hw_params, SND_PCM_ACCESS_RW_INTERLEAVED);
snd_pcm_hw_params_set_format(pcm_handle, hw_params, SND_PCM_FORMAT_S16_LE);
snd_pcm_hw_params_set_channels(pcm_handle, hw_params, 2);
unsigned int rate = 44100;
snd_pcm_hw_params_set_rate_near(pcm_handle, hw_params, &rate, 0);
snd_pcm_hw_params_set_period_size(pcm_handle, hw_params, 1024, 0);
snd_pcm_hw_params_set_periods(pcm_handle, hw_params, 4, 0);
snd_pcm_hw_params(pcm_handle, hw_params);