2015-7-27 下午3:12於 "Martin Geier" martin.geier@streamunlimited.com寫道：
Hi Raymond,
Output parameters with custom logs: set_buffer_time_near: -22 set period time: 12517 get period size: 276 set buffer size: 1104 get buffer size: 1104
ACCESS: RW_INTERLEAVED FORMAT: S16_LE SUBFORMAT: STD SAMPLE_BITS: 16 FRAME_BITS: 32 CHANNELS: 2 RATE: 22050 PERIOD_TIME: (12517 12518) PERIOD_SIZE: 276 PERIOD_BYTES: 1104 PERIODS: 4 BUFFER_TIME: (50068 50069) BUFFER_SIZE: 1104 BUFFER_BYTES: 4416
What do you mean, are latency always <= 50ms? In what cases?
http://www.alsa-project.org/alsa-doc/alsa-lib/group___p_c_m.html#ga45d50841b...
Set the hardware and software parameters in a simple way. Parameters:pcm PCM handle format required PCM format access required PCM access channels required PCM channels rate required sample rate in Hz soft_resample 0 = disallow alsa-lib resample stream, 1 = allow resampling latency required overall latency in us
Refer to your result seem latency only close to 50ms