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tests: Make loopback latency test more accurate

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This makes sure that we always take the timing at the point when we
write out the pulse, making the overall latency measurement more
accurate.
This commit is contained in:
Arun Raghavan 2013-05-27 14:27:42 +05:30
parent e001cc1424
commit c6df40a539
1 changed files with 9 additions and 4 deletions
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13
src/tests/lo-latency-test.c
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@ -54,12 +54,17 @@ static void nop_free_cb(void *p) {
static void write_cb(pa_stream *s, size_t nbytes, void *userdata) {
pa_lo_test_context *ctx = (pa_lo_test_context *) userdata;
static int ppos = 0;
int r, nsamp = nbytes / ctx->fs;
int r, nsamp;
/* Get the real requested bytes since the last write might have been
* incomplete if it caused a wrap around */
nbytes = pa_stream_writable_size(s);
nsamp = nbytes / ctx->fs;
if (ppos + nsamp > N_OUT) {
r = pa_stream_write(s, &out[ppos][0], (N_OUT - ppos) * ctx->fs, nop_free_cb, 0, PA_SEEK_RELATIVE);
nbytes -= (N_OUT - ppos) * ctx->fs;
ppos = 0;
/* Wrap-around, write to end and exit. Next iteration will fill up the
* rest */
nbytes = (N_OUT - ppos) * ctx->fs;
}
if (ppos == 0)