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</o:shapelayout></xml><![endif]--></head><body lang=ZH-CN link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span lang=EN-US style='font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497D'>Thank you for your answer.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497D'>Now I change the code as below:<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497D'>AudioFramedSource::AudioFrameSource()<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497D'>{<o:p></o:p></span></p><p class=MsoNormal style='text-indent:10.5pt'><span lang=EN-US style='font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497D'>gettimeofday(&m_timescale);<br>}<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497D'>void AudioFrameSource::doGetNextFrame()</span><span lang=EN-US><o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497D'>{</span><span lang=EN-US><o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497D'> CamerManager::GetInstance()->GetAudioFrame(“test”,(char*)fTo,fMaxSize,&fFrameSize,&fNumTruncatedBytes);<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497D'> Int64_t usec = m_timescale.tv_usec;<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497D'> usec += 40/8; //since every frame has 40 samples.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497D'> If(usec>=1000)<o:p></o:p></span></p><p class=MsoNormal style='text-indent:10.5pt'><span lang=EN-US style='font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497D'>{<o:p></o:p></span></p><p class=MsoNormal style='text-indent:10.5pt'><span lang=EN-US style='font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497D'> m_timescale.tv_sec+= usec/1000;<o:p></o:p></span></p><p class=MsoNormal style='text-indent:10.5pt'><span lang=EN-US style='font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497D'> m_timescale.tv_usec += usec%1000;<o:p></o:p></span></p><p class=MsoNormal style='text-indent:10.5pt'><span lang=EN-US style='font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497D'>}<o:p></o:p></span></p><p class=MsoNormal style='text-indent:10.5pt'><span lang=EN-US style='font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497D'>else<o:p></o:p></span></p><p class=MsoNormal style='margin-left:12.0pt;mso-para-margin-left:1.0gd'><span lang=EN-US style='font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497D'>{<o:p></o:p></span></p><p class=MsoNormal style='margin-left:12.0pt;mso-para-margin-left:1.0gd;text-indent:10.5pt'><span lang=EN-US style='font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497D'>m_timescale.tv_usec = usec;<br>}<o:p></o:p></span></p><p class=MsoNormal style='text-indent:9.0pt'><span lang=EN-US style='font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497D'>fPresentationTime = m_timescale;<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497D'>}<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497D'>With the above code, then the timestamp seems created correct. But the vlc still can’t play it correctly, as I know , vlc accesses rtsp by using live555. The mplayer can work.<o:p></o:p></span></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=MsoNormal><b><span style='font-size:10.0pt'>发件人<span lang=EN-US>:</span></span></b><span lang=EN-US style='font-size:10.0pt'> live-devel-bounces@ns.live555.com [mailto:live-devel-bounces@ns.live555.com] </span><b><span style='font-size:10.0pt'>代表 </span></b><span lang=EN-US style='font-size:10.0pt'>Ross Finlayson<br></span><b><span style='font-size:10.0pt'>发送时间<span lang=EN-US>:</span></span></b><span lang=EN-US style='font-size:10.0pt'> 2012</span><span style='font-size:10.0pt'>年<span lang=EN-US>9</span>月<span lang=EN-US>13</span>日<span lang=EN-US> 23:55<br></span><b>收件人<span lang=EN-US>:</span></b><span lang=EN-US> LIVE555 Streaming Media - development & use<br></span><b>主题<span lang=EN-US>:</span></b><span lang=EN-US> Re: [Live-devel] regardint every rtp packet's timestamp is same<o:p></o:p></span></span></p></div></div><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><div><blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><div><div><p class=MsoNormal><span lang=EN-US style='font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497D'>And the AudioFrameSource main code is like this:</span><span lang=EN-US><o:p></o:p></span></p></div><div><p class=MsoNormal><span lang=EN-US style='font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497D'>void AudioFrameSource::doGetNextFrame()</span><span lang=EN-US><o:p></o:p></span></p></div><div><p class=MsoNormal><span lang=EN-US style='font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497D'>{</span><span lang=EN-US><o:p></o:p></span></p></div><div><p class=MsoNormal><span lang=EN-US style='font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497D'> CamerManager::GetInstance()->GetAudioFrame(“test”,(char*)fTo,fMaxSize,&fFrameSize,&fNumTruncatedBytes);</span><span lang=EN-US><o:p></o:p></span></p></div><div><p class=MsoNormal style='text-indent:9.0pt'><span lang=EN-US style='font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497D'>fPresentationTime.tv_sec=usec/1000;</span><span lang=EN-US><o:p></o:p></span></p></div><div><p class=MsoNormal style='text-indent:9.0pt'><span lang=EN-US style='font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497D'>fPresentationTime.tv_usec = usec%1000;</span><span lang=EN-US><o:p></o:p></span></p></div><div><p class=MsoNormal style='text-indent:9.0pt'><span lang=EN-US style='font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497D'>usec+=200;</span><span lang=EN-US><o:p></o:p></span></p></div></div></blockquote><div><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p></div><p class=MsoNormal><span lang=EN-US>Why do you have a variable named "usec", when its value appears to be in milliseconds, not microseconds?<o:p></o:p></span></p></div><div><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p></div><div><p class=MsoNormal><span lang=EN-US>But anyway, assuming that "usec" is really intended to be a value in milliseconds: You need to be aware of the following:<o:p></o:p></span></p></div><div><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p></div><div><p class=MsoNormal><span lang=EN-US>1/ The very first value of "usec" - i.e., the value that's used when "doGetNextFrame()" is called for the first time - must be aligned with 'wall clock' time - i.e., the time that you'd get by calling "gettimeofday()". This is important for RTCP-based timing to work properly.<o:p></o:p></span></p></div><div><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p></div><div><p class=MsoNormal><span lang=EN-US>2/ Because you have specified a sampling frequency of 8000 samples per second, the length of time that you increment "usec" by each time that "GetAudioFrame()" is called needs to correspond to the number of samples that "GetAudioFrame()" has returned. The value you are currently incrementing "usec" by - 200 ms - is almost certainly wrong, because 200 ms corresponds to 8000*0.2 == 1600 audio samples, which will be too big for an outgoing RTP packet (assuming default packet size settings). (Note that each 1-channel u-law audio sample will take up 1 byte.)<o:p></o:p></span></p></div><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><div><p class=MsoNormal><span class=apple-style-span><span lang=EN-US style='font-size:13.5pt;font-family:"Helvetica","sans-serif";color:black'>Ross Finlayson</span></span><span lang=EN-US style='font-size:13.5pt;font-family:"Helvetica","sans-serif";color:black'><br><span class=apple-style-span>Live Networks, Inc.</span><br><span class=apple-style-span><a href="http://www.live555.com/">http://www.live555.com/</a></span></span><span lang=EN-US> <o:p></o:p></span></p></div><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p></div></body></html>