On Tue, 08 Aug 2017 16:31:38 +0200, Zhang Keqiao wrote:
In round trip latency test, the latency time is depends on the buffer size, before the test, it will playing one second 0 data to synchronize the playback thread and the recording thread, then begin playing a ~1000 HZ sine wave and record it. Stop counting and playing if the input's loudness is higher than the threshold. The issue here is before catching the sine wave, the buffer is full with 0 data need to deal with, so this latency is also counted.
This patch is intends to use flag to do the thread synchronization instead of playing 0 data, once recording thread is ready, playing the ~1000 HZ sine wave and start over this process until the final test is over.
Signed-off-by: Zhang Keqiao keqiaox.k.zhang@linux.intel.com
bat/alsa.c | 26 +++++++++++++++++++++++--- bat/common.h | 4 +++- bat/latencytest.c | 47 +++++++++++++++++++++++++---------------------- 3 files changed, 51 insertions(+), 26 deletions(-)
diff --git a/bat/alsa.c b/bat/alsa.c index 7613f44..5af7766 100644 --- a/bat/alsa.c +++ b/bat/alsa.c @@ -351,6 +351,14 @@ static int latencytest_process_output(struct pcm_container *sndpcm,
bat->latency.is_playing = true;
- /* set playback ready */
- bat->latency.state = LATENCY_STATE_PLAY_READY;
- /* wait for capture ready */
- while (bat->latency.state != LATENCY_STATE_RECORD_AND_LISTEN) {
usleep(10);- }
The code doesn't look good from the multi-thread synchronization POV...
thanks,
Takashi