mp3->wav: ffmpeg -i zairenjian.mp3 -acodec pcm_s16le -ar 44100 -ac 1 zairenjian.wav
wav->pcm:ffmpeg -i zairenjian.wav -f s16le -ar 44100 -acodec pcm_s16le zairenjian.pcm
mp3->wav: ffmpeg -i zairenjian.mp3 -acodec pcm_s16le -ar 44100 -ac 1 zairenjian.wav
wav->pcm:ffmpeg -i zairenjian.wav -f s16le -ar 44100 -acodec pcm_s16le zairenjian.pcm