Hi Ross,
Thanks for your comment. Here is the implementation of doGetNextFrame() in my
class (which is indeed derived from FramedSource):
void CAvSource::doGetNextFrame()
{
// Forward all frames in the input AV buffer
while (getTopMetadata() != NULL)
{
deliverFrame();
}
}
void CAvSource::deliverFrame()
{
av_data_t frame;
int32_t ret = av_get_variable_frame(mAvBuffer, &frame, POLL_NOWAIT);
if (ret <= 0)
{
log_error("Failed to get frame even if AV buffer told us some are "
"available for av_buffer %p", mAvBuffer);
return;
}
unsigned size = frame.num_bytes;
if (size > fMaxSize)
{
fFrameSize = fMaxSize;
fNumTruncatedBytes = size - fMaxSize;
}
else
{
fFrameSize = size;
fNumTruncatedBytes = 0;
}
memmove(fTo, frame.virt_addr, fFrameSize);
av_metadata_t* meta = frame.metadata;
fPresentationTime.tv_sec = meta->time_usec_then / 1000000LL;
fPresentationTime.tv_usec = meta->time_usec_then % 1000000LL;
fDurationInMicroseconds = meta->time_usec_now - meta->time_usec_then;
// We don't need the AV frame any more, so we can release it now.
av_finished_with_variable_frame(mAvBuffer, 1);
// Inform the reader that a new frame is available.
FramedSource::afterGetting(this);
}
Could it be that calling deliverFrame() multiple times might be wrong?
Thanks a lot for your help!
Fabrice
________________________________
From: live-devel [live-devel-boun...@ns.live555.com] on behalf of Ross
Finlayson [finlay...@live555.com]
Sent: 04 September 2014 17:21
To: LIVE555 Streaming Media - development & use
Subject: Re: [Live-devel] Please help: I have difficulties implementing the
right classes
I am trying to build an RTSP server using liveMedia to stream H.264 in real
time from a live encoder. In essence, as soon as I try to connect with VLC,
liveMedia abort()s with the following message:
FramedSource[0xbe838]::getNextFrame(): attempting to read more than once at the
same time!
This error means that a "FramedSource" object (presumably of your subclass that
you wrote to deliver live H.264 data from your encoder) is getting a call to
"getNextFrame()" while it is already handling a previous call to
"getNextFrame()".
I.e., it seems that your "FramedSource" subclass's implementation of
"doGetNextFrame()" is incorrect; it apparently is not calling
FramedSource::afterGetting(this);
after it completes delivery to the downstream (i.e., calling) object.
(Also, you should use "testRTSPClient" and/or "openRTSP" as RTSP clients for
testing, before using VLC. VLC is more complex, and is not our software.)
Ross Finlayson
Live Networks, Inc.
http://www.live555.com/
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