+ "channels = (int) 1, " \
+ "layout = (string) interleaved;" \
+ "audio/x-raw, " \
+ "format= (string) { S8, S16LE, S16BE, S24LE, S24BE, " \
+ "S32LE, S32BE, F32LE, F32BE, " \
+ "F64LE, F64BE }, " \
+ "rate = (int) [ 8000, 192000 ], " \
+ "channels = (int) 2, " \
+ "channel-mask = (bitmask) 0x3," \
+ "layout = (string) interleaved"