Unable to handle format
I am very new to JMF so maybe this is a stupid question but I cannot make incoming RTP audio stream be played. I get this on player.start():
Unable to handle format: ULAW/rtp, 8000.0 Hz, 8-bit, Mono
Failed to prefetch: com.sun.media.PlaybackEngine@82254d
Error: Unable to prefetch com.sun.media.PlaybackEngine@82254d
Can anybody tell me what should I do to play that format? It is a stream from asterisk PBX. I use (and need to use) cross platform JMF.
[483 byte] By [
fordfrog2a] at [2007-11-26 21:26:42]
# 1
> I am very new to JMF so maybe this is a stupid
> question but I cannot make incoming RTP audio stream
> be played. I get this on player.start():
>
> Unable to handle format: ULAW/rtp, 8000.0 Hz, 8-bit,
> Mono
> Failed to prefetch:
> com.sun.media.PlaybackEngine@82254d
> Error: Unable to prefetch
> com.sun.media.PlaybackEngine@82254d
>
> Can anybody tell me what should I do to play that
> format? It is a stream from asterisk PBX. I use (and
> need to use) cross platform JMF.
Change the format to ULAW 8000,8,1 and see.
# 2
Thank you, but how can I do that? I mean where should I change the format?
# 3
Wait a second. I am having some scruples about what i just told. Post your code and use code tags
# 4
Little more background on it. I try to code SIP phone. Signalization part seems to be working. Currently I'm working on the part that receives the RTP stream. This class is used to receive and play the RTP stream. Most of if is just rewrite of Jain-Sip-Applet-Phone. Error about the format is logged from 'player.start()' in controllerUpdate(). When starting to receive RTP stream, RTPReceiver is first instantiated and then receive() is called on it.
public class RTPReceiver implements ReceiveStreamListener,
SessionListener,
ControllerListener {
...
public void controllerUpdate(final ControllerEvent event) {
if (event instanceof RealizeCompleteEvent) {
final Player player = (Player) event.getSourceController();
player.start();
}
}
public void receive(final InetAddress localIPAddress) {
rTPManager = RTPManager.newInstance();
final SessionAddress localAddress =
new SessionAddress(
localIPAddress,
rTPSessionDescription.getLocalPort());
rTPManager.addSessionListener(this);
rTPManager.addReceiveStreamListener(this);
if (LOG.isInfoEnabled()) {
LOG.info("Initalizing RTP manager: " + localAddress);
}
try {
rTPManager.initialize(localAddress);
} catch (InvalidSessionAddressException ex) {
throw new ConfigurationException("Invalid session address", ex);
} catch (IOException ex) {
throw new SystemException("Cannot initialize RTP manager", ex);
}
final BufferControl bufferControl =
(BufferControl) rTPManager.getControl(
"javax.media.control.BufferControl");
if (bufferControl != null) {
bufferControl.setBufferLength(0);
bufferControl.setMinimumThreshold(0);
}
final SessionAddress remoteAddress =
new SessionAddress(
rTPSessionDescription.getRemoteAddress(),
rTPSessionDescription.getRemotePort());
if (LOG.isInfoEnabled()) {
LOG.info("Adding target to RTP manager: " + remoteAddress);
}
try {
rTPManager.addTarget(remoteAddress);
} catch (InvalidSessionAddressException ex) {
throw new ConfigurationException("Invalid session address", ex);
} catch (IOException ex) {
throw new SystemException("Cannot add target to RTP manager", ex);
}
}
public void update(final ReceiveStreamEvent event) {
if (event instanceof NewReceiveStreamEvent) {
final Participant participant = event.getParticipant();
final String participantName = getParticipantName(participant);
final DataSource dataSource =
event.getReceiveStream().getDataSource();
final RTPControl rTPControl =
(RTPControl) dataSource.getControl(
"javax.media.rtp.RTPControl");
if (rTPControl != null) {
LOG.info("Setting audio format to MPEG_RTP,48000,16,1");
rTPControl.addFormat(
new AudioFormat(AudioFormat.MPEG_RTP, 48000, 16, 1),
14);
}
LOG.info(
"Starting new player for received stream from participant: "
+ participantName);
final Player player;
try {
player = Manager.createPlayer(dataSource);
} catch (IOException ex) {
throw new SystemException("Cannot create player", ex);
} catch (NoPlayerException ex) {
throw new SystemException("Cannot create player", ex);
}
players.put(participantName, player);
player.addControllerListener(this);
player.realize();
} else if (event instanceof ByeEvent) {
final Participant participant = event.getParticipant();
final String participantName = getParticipantName(participant);
final Player player = players.get(participantName);
if (player != null) {
player.close();
players.remove(participantName);
}
}
}
...
I also tried to change codec at asterisk side to 'gsm' and got this:
Unable to handle format: gsm/rtp, 8000.0 Hz, Mono
Failed to prefetch: com.sun.media.PlaybackEngine@1a76eff
Error: Unable to prefetch com.sun.media.PlaybackEngine@1a76eff
# 5
Here is my list of supported codecs, if it helps:
dvi/rtp, 8000.0 Hz, 4-bit, Mono
dvi/rtp, 11025.0 Hz, 4-bit, Mono
dvi/rtp, 22050.0 Hz, 4-bit, Mono
g723/rtp, 8000.0 Hz, Mono, FrameSize=192 bits
gsm/rtp, 8000.0 Hz, Mono, FrameSize=264 bits
ULAW/rtp, 8000.0 Hz, 8-bit, Mono, FrameSize=8 bits
mpegaudio/rtp, 48000.0 Hz, 16-bit, Mono, BigEndian, Signed
mpegaudio/rtp, 22050.0 Hz, 16-bit, Mono, BigEndian, Signed
mpegaudio/rtp, 44100.0 Hz, 16-bit, Stereo, Signed
mpegaudio/rtp, 48000.0 Hz, 16-bit, Stereo, BigEndian, Signed
mpegaudio/rtp, 22050.0 Hz, 16-bit, Stereo, BigEndian, Signed
mpegaudio/rtp, 44100.0 Hz, 16-bit, Mono, BigEndian, Signed
mpegaudio/rtp, 44100.0 Hz, 16-bit, Stereo, BigEndian, Signed
# 6
Here is some more info I extracted from player before it is started. Unfortunately I still didn't make it work. I'd appreciate any help.
6718 [RTPEventHandler] INFO cz.startnet.utils.javax.rtp.RTPReceiver - Datasource content type: raw
6719 [RTPEventHandler] INFO cz.startnet.utils.javax.rtp.RTPReceiver - Received new RTP stream: gsm/rtp, 8000.0 Hz, Mono
6720 [RTPEventHandler] INFO cz.startnet.utils.javax.rtp.RTPReceiver - Datasource control:
RTPTime is 0
Seqno is 0
CodecInfo is {3=gsm/rtp, 8000.0 Hz, 8-bit, Mono}
6720 [RTPEventHandler] INFO cz.startnet.utils.javax.rtp.RTPReceiver - Starting new player for received stream from participant: noname
6790 [JMF thread: SendEventQueue: com.sun.media.content.unknown.Handler] INFO cz.startnet.utils.javax.rtp.RTPReceiver - Player format: gsm/rtp, 8000.0 Hz, Mono
6790 [JMF thread: SendEventQueue: com.sun.media.content.unknown.Handler] INFO cz.startnet.utils.javax.rtp.RTPReceiver - Player supported format: gsm/rtp, 8000.0 Hz, Mono
6791 [JMF thread: SendEventQueue: com.sun.media.content.unknown.Handler] INFO cz.startnet.utils.javax.rtp.RTPReceiver - Player control:
RTPTime is 0
Seqno is 0
CodecInfo is {3=gsm/rtp, 8000.0 Hz, 8-bit, Mono}
6791 [JMF thread: SendEventQueue: com.sun.media.content.unknown.Handler] INFO cz.startnet.utils.javax.rtp.RTPReceiver - Player control: com.sun.media.renderer.audio.JavaSoundRenderer$GCA@1add463
6791 [JMF thread: SendEventQueue: com.sun.media.content.unknown.Handler] INFO cz.startnet.utils.javax.rtp.RTPReceiver - Player control: com.sun.media.renderer.audio.AudioRenderer$BC@152bdc7
6791 [JMF thread: SendEventQueue: com.sun.media.content.unknown.Handler] INFO cz.startnet.utils.javax.rtp.RTPReceiver - Player control: com.sun.media.renderer.audio.JavaSoundRenderer$PeakVolumeMeter@1296d1d
6791 [JMF thread: SendEventQueue: com.sun.media.content.unknown.Handler] INFO cz.startnet.utils.javax.rtp.RTPReceiver - Player control: com.sun.media.PlaybackEngine$BitRateA@baa31b
6791 [JMF thread: SendEventQueue: com.sun.media.content.unknown.Handler] INFO cz.startnet.utils.javax.rtp.RTPReceiver - Player control: com.sun.media.BasicJMD[panel0,0,0,512x200,invalid,layout=java.awt.BorderLayout]
6791 [JMF thread: SendEventQueue: com.sun.media.content.unknown.Handler] INFO cz.startnet.utils.javax.rtp.RTPReceiver - Player control: com.sun.media.PlaybackEngine$PlayerTControl@12a66ea
Unable to handle format: gsm/rtp, 8000.0 Hz, Mono
Failed to prefetch: com.sun.media.PlaybackEngine@95215b
Error: Unable to prefetch com.sun.media.PlaybackEngine@95215b
# 7
Finally solved. The problem was asterisk PBX that is running on my dev laptop was blocking sound device (alsa) which caused that "Unable to handle format" error. So this message doesn't mean necessarily that JMF is not able to handle format but it also can mean the sound device is not accessible.
