On Fri, Jul 11, 2003 at 02:09:57AM +0300, Kai Vehmanen wrote:
> How about if you make the following change to the test:
>
> --cut--
> printf("#fragments, #bytes: %d, %d\n", info.fragments, info.bytes);
> - if (info.fragments > 0)
> - {
> ssize_t rlen = read(fd, buf, sizeof(buf));
> if (rlen <= 0)
> {
> perror("read");
> exit(1);
> }
> printf("Read %d bytes.\n", rlen);
> - }
> static struct timespec naptime = { 0, 100000000 };
That gives rather strange output:
Fragment size: 1024
Number of fragments: 32767
Number of channels: 1
Sample rate: 22050
Number of full fragments that can be read or written without blocking: 0
Total number of fragments allocated for buffering: 2
Size of a fragment in bytes: 1024
Number of bytes that can be read or written immediately without blocking: 0
#fragments, #bytes: 0, 0
Read 1024 bytes. Average bytes/second read: 9579.135446
#fragments, #bytes: 2, 2048
Read 1024 bytes. Average bytes/second read: 9833.483781
#fragments, #bytes: 1, 1024
Read 1024 bytes. Average bytes/second read: 9906.130386
#fragments, #bytes: 0, 0
Read 1024 bytes. Average bytes/second read: 8601.771175
#fragments, #bytes: 1, 1600
Read 1024 bytes. Average bytes/second read: 8857.074156
#fragments, #bytes: 2, 2048
Read 1024 bytes. Average bytes/second read: 9034.443817
#fragments, #bytes: 1, 1024
Read 1024 bytes. Average bytes/second read: 9165.830174
#fragments, #bytes: 0, 0
Read 1024 bytes. Average bytes/second read: 8631.080318
#fragments, #bytes: 1, 1632
Read 1024 bytes. Average bytes/second read: 8768.366140
#fragments, #bytes: 2, 2048
Read 1024 bytes. Average bytes/second read: 8881.310479
#fragments, #bytes: 1, 1024
Read 1024 bytes. Average bytes/second read: 8975.563423
#fragments, #bytes: 0, 0
Read 1024 bytes. Average bytes/second read: 8647.230571
#fragments, #bytes: 1, 1600
Read 1024 bytes. Average bytes/second read: 8741.039482
#fragments, #bytes: 2, 2048
Read 1024 bytes. Average bytes/second read: 8822.479599
#fragments, #bytes: 1, 1024
Read 1024 bytes. Average bytes/second read: 8894.586984
#fragments, #bytes: 0, 0
Read 1024 bytes. Average bytes/second read: 8655.099768
#fragments, #bytes: 1, 1600
Read 1024 bytes. Average bytes/second read: 8726.444415
#fragments, #bytes: 2, 2048
Read 1024 bytes. Average bytes/second read: 8790.244507
#fragments, #bytes: 1, 1024
Read 1024 bytes. Average bytes/second read: 8848.177087
#fragments, #bytes: 0, 0
Read 1024 bytes. Average bytes/second read: 8660.003933
#fragments, #bytes: 1, 1600
Read 1024 bytes. Average bytes/second read: 8717.387832
[...cut...]
It doesn't feel right to read bytes when it says
that there are no fragments/bytes available.
Is the average bytes/second correct though?
with
Number of channels: 1
Sample rate: 22050
and AFMT_S16_LE, what should it be? I am not so good
at calculating things without knowing the unity of the
'rate' ;)... bits/s? Byte/s? (16-bit)Words/sec?
Anyway, it seems too low or too high.
When I add back the "if (info.fragments > 0)" test
and decrease the naptime drastically, I get:
#fragments, #bytes: 1, 1088
Read 1024 bytes. Average bytes/second read: 16057.031185
#fragments, #bytes: 0, 256
#fragments, #bytes: 0, 448
#fragments, #bytes: 0, 640
#fragments, #bytes: 0, 832
#fragments, #bytes: 1, 1024
Read 1024 bytes. Average bytes/second read: 16060.372190
#fragments, #bytes: 0, 192
#fragments, #bytes: 0, 384
#fragments, #bytes: 0, 608
#fragments, #bytes: 0, 800
#fragments, #bytes: 1, 1024
Read 1024 bytes. Average bytes/second read: 16059.965127
#fragments, #bytes: 0, 192
#fragments, #bytes: 0, 416
#fragments, #bytes: 0, 608
#fragments, #bytes: 0, 832
#fragments, #bytes: 1, 1024
Read 1024 bytes. Average bytes/second read: 16059.006144
etc
Still nothing like 22050 - and certainly unequal to 8700.
--
Carlo Wood <[EMAIL PROTECTED]>
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