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linux下的rtp的实例源代码

            20<br>
            stream_end</code>
        </div><br>
        <strong>Note:</strong> GSM-AMR has not a well know payload
        type.
    </div>

    <h1 id="52" name="52" class="book-h3">4.6. PCM audio
    streams</h1>

    <div style="margin-left: 2em">
        <p>For a PCM L16 audio file the sd description is as like
        this:<br></p>

        <div class="codeblock">
            <code>stream<br>
            &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;file_name
            audio.L16m8k<br>
            &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;priority
            2<br>
            &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;payload_type
            106<br>
            &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;clock_rate
            8000<br>
            &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;audio_channels
            1<br>
            &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;encoding_name
            L16<br>
            &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;bit_per_sample
            16<br>
            &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;pkt_len
            20<br>
            stream_end</code>
        </div>
    </div>

    <h1 id="37" name="37" class="book-h2">5. How to add a Creative
    Commons license to the distribution of your contents</h1>

    <div style="margin-left: 2em">
        <p>If you have some multimedia files with Creative Commons
        licenses you can use the follow key words in th sd
        description:</p>

        <ul>
            <li><tt>license</tt></li>

            <li><tt>verify</tt></li>

            <li><tt>title</tt></li>

            <li><tt>creator</tt></li>
        </ul>

        <p>For the meaning of these keywords please refer to the
        draft at <a href=
        "http://streaming.polito.it/files/draft-omsp-ccplem-streaming-01.sxw">
        http://streaming.polito.it/files/draft-omsp-ccplem-streaming-01.sxw</a></p>

        <p>This is an example:<br></p>

        <div class="codeblock">
            <code>stream<br>
            &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;file_name
            cc.mp3<br>
            &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;aggregate
            movie<br>
            &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;media_source
            live<br>
            &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;priority
            1<br>
            &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;license
            http://creativecommons.org/licenses/by-nc/1.0/<br>
            &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;verify
            http://streaming.polito.it/<br>
            &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;title
            Building In The Past - Ccc<br>
            &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;creator
            OMSP Team<br>
            &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;payload_type
            14<br>
            &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;clock_rate
            90000<br>
            &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;encoding_name
            MPA<br>
            &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;pkt_len
            26.12<br>
            stream_end<br>
            stream<br>
            &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;file_name
            cc.mpg<br>
            &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;aggregate
            movie<br>
            &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;media_source
            live<br>
            &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;priority
            1<br>
            &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;license
            http://creativecommons.org/licenses/by-nc/1.0/<br>
            &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;verify
            http://streaming.polito.it/<br>
            &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;title
            Building In The Past - Ccc<br>
            &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;creator
            OMSP Team<br>
            &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;payload_type
            32<br>
            &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;clock_rate
            90000<br>
            &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;encoding_name
            MPV<br>
            &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;coding_type
            frame<br>
            &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;frame_rate
            25<br>
            &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;byte_per_pckt
            1000<br>
            stream_end</code>
        </div>
    </div>

    <h1 id="38" name="38" class="book-h2">6. How to stream live
    media</h1>

    <div style="margin-left: 2em">
        <p>In case of video from a webcam and audio from a dsp, you
        must use an application which works to encode its inputs
        and redirect its outputs on two named pipe, the first one
        for audio.mp3 and the last one for video.mpg.</p>

        <p>You can install ffmpeg (compiled with the lame support,
        see the ffmpeg documentations) and use this script:<br></p>

        <div class="codeblock">
            <code>#!/bin/bash<br>
            #<br>
            #------<br>
            # Note:<br>
            #------<br>
            # modprobe pwc fps=25 size=qcif power_save=0
            fbufs=5<br>
            # note: fps&gt;=25 (mpeg 1 or 2)<br>
            ffmpeg -y -ad /dev/dsp -ar 44100 -ac 2 -vn -ab 128
            pipeaudio.mp3 &amp;<br>
            ffmpeg -y -an -vd /dev/video0 -vcodec mpeg1video -f
            mpeg1video -r 25 -s qcif -b 128 -bt 1 -g 12 -bf 2
            pipevideo.mpg<br>
            # you can use also fame and sox+lame<br>
            # fame -d /dev/video -f 25 -p QCIF -c IPPPPP -r 10 -b
            128000 pipevideo.mpg<br>
            # sox -t ossdsp -c2 -w -r44100 /dev/dsp -t raw - | lame
            -r -x -s 44.1 -m j --preset cbr 128 - - &gt;
            pipeaudio.mp3</code>
        </div><br>
        In SD file you must change:

        <ul>
            <li><tt>stored</tt> --&gt; <tt>live</tt></li>

            <li><tt>audio.mp3</tt> --&gt;
            <tt>pipeaudio.mp3</tt></li>

            <li><tt>video.mpg</tt> --&gt;
            <tt>pipevido.mpg</tt></li>
        </ul>

        <p>Finally you must create the named pipes:<br></p>

        <div class="codeblock">
            <code>$ mkfifo -m 655 pipeaudio.mp3<br>
            $ mkfifo -m 655 pipevideo.mpg</code>
        </div>
    </div>

    <h1 id="39" name="39" class="book-h2">7. Utilities used in the
    scripts</h1>

    <div style="margin-left: 2em">
        <ul>
            <li>MP3 encoder: <strong>lame</strong> (<a href=
            "http://lame.sourceforge.net">http://lame.sourceforge.net</a>)<br></li>

            <li>MPEG 1 and 2 encoder: <strong>mpeg2enc</strong>
            (<a href=
            "http://mjpeg.sourceforge.nett">http://mjpeg.sourceforge.net</a>)<br></li>

            <li>Multicodec encoder: <strong>ffmpeg</strong>
            (<a href=
            "http://ffmpeg.sourceforge.net">http://ffmpeg.sourceforge.net</a>)<br></li>

            <li>Audio utility: <strong>sox</strong> (<a href=
            "http://sox.sourceforge.net">http://sox.sourceforge.net</a>)<br></li>

            <li>Multimedia player: <strong>MPlayer</strong>
            (<a href=
            "http://www.mplayerhq.hu">http://www.mplayerhq.hu</a>)</li>
        </ul>
    </div>

    <h1 id="487" name="487" class="book-h2">8. Compatibility list
    and other issues</h1>

    <div style="margin-left: 2em">
        <br>
    </div>

    <h1 id="488" name="488" class="book-h3">8.1 Suggested Streaming
    Clients</h1>

    <div style="margin-left: 2em">
        <p><u>Windows</u></p>

        <ul>
            <li><a href="http://www.videolan.org/vlc/">VLC Media
            Player</a> from Videolan [FULL COMPATIBILTY]</li>

            <li><a href="http://www.real.com/">Real Player</a> 10
            for Windows [FULL COMPATIBILTY] (see below)</li>
        </ul>

        <p><u>GNU/Linux</u></p>

        <ul>
            <li><a href="client">NeMeSI</a> from OMSP [FULL
            COMPATIBILITY]</li>

            <li><a href="http://mplayerhq.hu">MPlayer</a> +
            <a href="http://live555.com/liveMedia/">Live555.com</a>
            libraries [FULL COMPATIBILITY]</li>

            <li><a href="http://www.videlan.org/vlc">VLC Media
            Player</a> + <a href=
            "http://live555.com/liveMedia/">Live555.com</a>
            libraries [FULL COMPATIBILITY]</li>

            <li><a href="https://player.helixcommunity.org/">Helix
            Player</a> for Linux [FULL COMPATIBILITY]</li>
        </ul>

        <p><u>Mac OS X</u></p>

        <ul>
            <li><a href="http://www.videolan.org/vlc/">VLC Media
            Player</a> from Videolan [FULL COMPATIBILTY]</li>

            <li><a href="http://www.real.com/">Real Player</a> 10
            for MacOS X [FULL COMPATIBILTY]</li>
        </ul>
    </div>

    <h1 id="489" name="489" class="book-h3">8.2 Technical tips</h1>

    <div style="margin-left: 2em">
        <p><u>Firewalls, NATs &amp; Co.</u></p>

        <p>Please check that your firewall is not blocking incoming
        UDP packets, otherwise you will not be able to see/listen
        the webcast.<br>
        Note that you would experience some problem if your IP
        address is masquerated (i.e. behind a router doing NAT),
        especially using NeMeSI.</p>

        <p><u>Real (win32) configuration</u></p>

        <p>RealPlayer needs some tuning in order to be usable with
        Fenice:</p>

        <ul>
            <li>Disable PerfectPlay options</li>

            <li>In transport configuration you should disable
            <strong>TCP</strong> protocol and leave active only
            <strong>Multicast</strong> and
            <strong>UDP</strong></li>
        </ul>
    </div>

    <h1 id="40" name="40" class="book-h2">9. License</h1>

    <div style="margin-left: 2em">
        <p><strong><big>Creative Commons Legal
        Code</big></strong></p>

        <p><strong>Attribution-ShareAlike 2.0</strong></p>

        <ul>
            <li><a href=
            "http://creativecommons.org/licenses/by-sa/2.0/legalcode">
            Generic Jurisdiction</a></li>

            <li><a href=
            "http://creativecommons.org/licenses/by-sa/2.0/it/legalcode">
            Italian Jurisdiction</a></li>
        </ul>
    </div>
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