All,
There was no answer to my previous post, but I want to let you know that following
change in stream.c fixed the issue.
old:
/*stream->port.info.bytes_per_frame = stream->codec_param.info.max_bps *
stream->codec_param.info.frm_ptime *
stream->codec_param.setting.frm_per_pkt /
8 / 1000;
8 / 1000;
new:
stream->port.info.bytes_per_frame = stream->port.info.samples_per_frame *
stream->port.info.bits_per_sample / 8;
With the old implementation when I connected the stream to a resample_port
there was a crash because the
bytes_per_frame/samples_per_frame/bits_per_frame didn't match.
Thomas
-------- directBOX Reply ---------------
From: skoe@xxxxxxxxxxxxx
To : pjsip at lists.pjsip.org
Date: 11.08.2010 14:39:18
Hi all,
I'm a bit confused about the relationship of the port info attributes
bytes_per_frame, samples_per_frame and bits_per_sample.
I assumed that
bytes_per_frame = samples_per_frame * bits_per_sample / 8
But at the moment I'm tracking down an issue and stumbled about these
lines in pjmedia_stream_create():
/* Set additional info and callbacks. */
stream->port.info.bits_per_sample = 16;
stream->port.info.samples_per_frame = info->fmt.clock_rate *
stream->codec_param.info.channel_cnt *
stream->codec_param.info.frm_ptime *
stream->codec_param.setting.frm_per_pkt /
1000;
stream->port.info.bytes_per_frame = stream->codec_param.info.max_bps *
stream->codec_param.info.frm_ptime *
stream->codec_param.setting.frm_per_pkt /
8 / 1000;
with PCMU I get:
clock_rate = 8000, channel_cnt = 1, frm_ptime = 10, frm_per_pkt = 2, max_bps = 64000
=> samples_per_frame = 160
=> bytes_per_frame = 160
This violates the assumption above. Is this sane?
Shouldn't be the port.info independent from the bitrate of the codec?
Regards,
Thomas
