判斷環境聲音的 API

3.取得麥克風接收音量峰值

intget_max_volume()

{

inti=0;

intmax = 0;

intbytes_per_frame= bitdepth* params.channels/ 8;

intdata_frames= params.rate;

intdata_size= bytes_per_frame* data_frames;

ret = snd_pcm_read(w_snd, record_buffer, data_frames);

if (ret != data_frames) {

aud_msg("ret: %d", ret);

}

for (i=0; i<data_frames; i++) {

if (record_buffer[i] > max) max = record_buffer[i];

}

return max;

}