afinfo 1.up.wav File: 1.up.wav File type ID: WAVE Num Tracks: 1 ---- Data format: 1 ch, 8000 Hz, 'lpcm' (0x0000000C) 16-bit little-endian signed integer no channel layout. estimated duration: 58.520000 sec audio bytes: 936320 audio packets: 468160 bit rate: 128000 bits per second packet size upper bound: 2 maximum packet size: 2 audio data file offset: 44 optimized source bit depth: I16
其中 bit rate就是速率，单位是bits per second
1 千字节(kb)=1024 字节(b)
