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• Podcast Producer 2 REST api

  11 septembre 2009

  I’ve been working on documenting the REST api that PCP2 uses for client server communication as part of a new project. I thought it might be useful to other folks. Consider this a work in progress - I’ve only documented the workflow for doing a multisource recording so far. Follow the job for the info.

  Each section gives a sample command and a sample response.

  All pages are behind basic HTTP auth.

  General sequence of events

  * get workflow list
  * get cameras
  * request status for camera (including thumbnail)
  * start cameras
  * create recording enclosure
  * stop cameras, provide submission_UUID returned by above step, include title

  ---

  *URL : https://pcpserver:8170/podcastproducer/info

  *Type : GET

  *Content : version=2

  *Response :
  <pre>
  <podcast_producer_result>
  <action>index</action>
  <status>success</status>
  <plist version="1.0">
  <dict>
  <key>server_version</key>
  <string>2.0</string>
  <key>http_auth_type</key>
  <array>
  <string>basic</string>
  <string>digest</string>
  <string>kerberos</string>
  </array>
  <key>krb_service_principals</key>
  <array>
  <string>pcast/x101-186-103-dhcp.cla.umn.edu@X101-186-103-DHCP.CLA.UMN.EDU</string>
  </array>
  <key>server_uuid</key>
  <string>DB31DA49-10AE-472C-B3B9-86A8F8112399</string>
  <key>cluster_members</key>
  <dict>
  <key>F1021B98-7E7E-44FB-8EB1-E0DA1885D5BA</key>
  <dict>
  <key>date_added</key>
  <string>Tue Sep 01 10:23:49 -0500 2009</string>
  <key>last_update</key>
  <string>Tue Sep 08 10:35:17 -0500 2009</string>
  <key>server_host</key>
  <string>x101-186-103-dhcp.cla.umn.edu</string>
  <key>server_port</key>
  <string>8170</string>
  <key>tunnel_agent_host</key>
  <string>x101-186-103-dhcp.cla.umn.edu</string>
  <key>tunnel_agent_port</key>
  <string>8175</string>
  <key>network_addrs</key>
  <array>
  <string>128.101.186.103</string>
  </array>
  </dict>
  </dict>
  </dict>
  </plist>
  </podcast_producer_result>
  </pre>

  ---

  * URL : https://pcpserver:8170/podcastproducer/workflows
  * Type : GET
  * Content : version=2&language=en
  * Response :
  <pre>
  <podcast_producer_result>
  <action>index</action>
  <status>success</status>
  <results>OK</results>
  <plist version="1.0">
  <dict>
  <key>user_fullname</key>
  <string>podcast</string>
  <key>user_shortname</key>
  <string>podcast</string>
  <key>workflows</key>
  <array>
  <dict>
  <key>name</key>
  <string>Montage</string>
  <key>title</key>
  <string>Montage</string>
  <key>description</key>
  <string>Montage workflow</string>
  <key>uuid</key>
  <string>F797D54D-1539-42AA-B6AC-3CB3A4C15EF5</string>
  <key>version</key>
  <string>2.0</string>
  <key>editor</key>
  <string>Podcast Composer</string>
  <key>sources</key>
  <array>
  <dict>
  <key>contentTypes</key>
  <array>
  <string>com.apple.quicktime-movie</string>
  <string>com.adobe.pdf</string>
  <string>com.apple.iwork.keynote.key</string>
  <string>com.apple.iwork.pages.pages</string>
  <string>org.openxmlformats.wordprocessingml.document</string>
  <string>com.microsoft.word.doc</string>
  <string>org.openxmlformats.presentationml.presentation</string>
  <string>com.microsoft.powerpoint.ppt</string>
  <string>com.microsoft.bmp</string>
  <string>com.compuserve.gif</string>
  <string>public.jpeg-2000</string>
  <string>public.jpeg</string>
  <string>com.adobe.pdf</string>
  <string>com.apple.pict</string>
  <string>public.png</string>
  <string>com.adobe.photoshop-image</string>
  <string>com.sgi.sgi-image</string>
  <string>com.truevision.tga-image</string>
  <string>public.tiff</string>
  </array>
  <key>description</key>
  <string>Any Document</string>
  <key>isFolder</key>
  <true/>
  <key>isOptional</key>
  <false/>
  <key>sourceTypes</key>
  <array>
  <string>File</string>
  </array>
  </dict>
  </array>
  <key>user_requirements</key>
  <array>
  <string>Title</string>
  <string>Description</string>
  </array>
  <key>access_control_entries</key>
  <array>
  </array>
  </dict>
  <dict>
  <key>name</key>
  <string>Single Source</string>
  <key>title</key>
  <string>Single Source</string>
  <key>description</key>
  <string>Single Source workflow</string>
  <key>uuid</key>
  <string>DEFA1587-A650-426E-92DA-01C5EB811705</string>
  <key>version</key>
  <string>2.0</string>
  <key>editor</key>
  <string>Podcast Composer</string>
  <key>sources</key>
  <array>
  <dict>
  <key>contentTypes</key>
  <array>
  <string>com.apple.quicktime-movie</string>
  </array>
  <key>description</key>
  <string>Any Video</string>
  <key>isFolder</key>
  <false/>
  <key>isOptional</key>
  <false/>
  <key>sourceTypes</key>
  <array>
  <string>Video</string>
  <string>Screen</string>
  <string>Audio</string>
  <string>File</string>
  </array>
  </dict>
  </array>
  <key>user_requirements</key>
  <array>
  <string>Title</string>
  <string>Description</string>
  </array>
  <key>access_control_entries</key>
  <array>
  </array>
  </dict>
  </array>
  </dict>
  </plist>
  </podcast_producer_result>
  </pre>
  ----

  * URL : https://pcpserver:8170/podcastproducer/cameras
  * Type : GET
  * Content : version=2
  * Response :
  <pre>
  <podcast_producer_result>
  <action>index</action>
  <status>success</status>
  <plist version="1.0">
  <dict>
  <key>cameras</key>
  <array>
  <dict>
  <key>name</key>
  <string>150-A Camera</string>
  <key>uuid</key>
  <string>307682A5-B552-4AFA-B7E2-3811D772C9A1</string>
  <key>connected_to_member_uuid</key>
  <string>F1021B98-7E7E-44FB-8EB1-E0DA1885D5BA</string>
  <key>in_use</key>
  <string>false</string>
  <key>recording_status</key>
  <string>online</string>
  <key>preview_url</key>
  <string>https://x101-186-103-dhcp.cla.umn.edu:8170/podcastproducer/previews/307682A5-B552-4AFA-B7E2-3811D772C9A1.jpg</string> ;
  <key>access_control_entries</key>
  <array>
  </array>
  </dict>
  <dict>
  <key>name</key>
  <string>150-A Epiphan</string>
  <key>uuid</key>
  <string>CE610AB0-CA50-49EB-8FFE-78E57CDCA550</string>
  <key>connected_to_member_uuid</key>
  <string>F1021B98-7E7E-44FB-8EB1-E0DA1885D5BA</string>
  <key>in_use</key>
  <string>false</string>
  <key>recording_status</key>
  <string>online</string>
  <key>preview_url</key>
  <string>https://x101-186-103-dhcp.cla.umn.edu:8170/podcastproducer/previews/CE610AB0-CA50-49EB-8FFE-78E57CDCA550.jpg</string> ;
  <key>access_control_entries</key>
  <array>
  </array>
  </dict>
  </array>
  </dict>
  </plist>
  </podcast_producer_result>
  </pre>

  ---

  * URL : https://pcpserver:8170/podcastproducer/cameras/start
  * Type : POST
  * Content : action=pause&version=2&camera_name=150-A%20Camera&controller=cameras
  * Response :
  <pre>
  <podcast_producer_result>
  <action>start</action>
  <status>success</status>
  <results>OK</results>
  </podcast_producer_result>
  </pre>

  ---

  * URL : https://pcpserver:8170/podcastproducer/cameras/status
  * Type : POST
  * Content : delay=0&action=start&version=2&camera_name=150-A%20Epiphan&controller=cameras
  * Response :
  <pre><podcast_producer_result>
  <action>status</action>
  <status>success</status>
  <results>OK</results>
  <plist version="1.0">
  <dict>
  <key>preview</key>
  <string>https://x101-186-103-dhcp.cla.umn.edu:8170/podcastproducer/previews/307682A5-B552-4AFA-B7E2-3811D772C9A1.jpg</string> ;
  <key>preview_image_data</key>
  <string>RAW JPEG DATA RAW JPEG DATA RAW JPEG DATA RAW JPEG DATA RAW JPEG DATA</string>
  <key>recording_status</key>
  <string>online</string>
  <key>started_at</key>
  <string>Tue Sep 08 09:31:40 -0500 2009</string>
  <key>stopped_at</key>
  <string>Tue Sep 08 09:32:10 -0500 2009</string>
  <key>elapsed</key>
  <string>41</string>
  <key>last_error</key>
  <string>805306368</string>
  </dict>
  </plist>
  </podcast_producer_result>
  </pre>

  ---

  * URL : https://pcpserver:8170/podcastproducer/cameras/pause
  * Type : POST
  * Content : action=pause&version=2&camera_name=150-A%20Camera&controller=cameras
  * Response :
  <pre><podcast_producer_result>
  <action>status</action>
  <status>success</status>
  <results>OK</results>
  <plist version="1.0">
  <dict>
  <key>preview</key>
  <string>https://x101-186-103-dhcp.cla.umn.edu:8170/podcastproducer/previews/307682A5-B552-4AFA-B7E2-3811D772C9A1.jpg</string> ;
  <key>recording_status</key>
  <string>online</string>
  <key>started_at</key>
  <string>Tue Sep 08 09:31:40 -0500 2009</string>
  <key>stopped_at</key>
  <string>Tue Sep 08 09:32:10 -0500 2009</string>
  <key>elapsed</key>
  <string>41</string>
  <key>last_error</key>
  <string>805306368</string>
  </dict>
  </plist>
  </podcast_producer_result></pre>

  ---

  * URL : https://pcpserver:8170/podcastproducer/cameras/stop
  * Type : POST
  * Content : workflow_name=&UserMetadata_Description=&submission_uuid=7497E3AC-0A75-4C7C-8C66-26294C9274FE&action=stop&version=2&camera_name=150-A%20Epiphan&controller=cameras&UserMetadata_Title=Test123
  * Response :
  <pre><podcast_producer_result>
  <action>stop</action>
  <status>success</status>
  <results>OK</results>
  </podcast_producer_result>
  </pre>

  ---

  * URL : https://pcpserver:8170/podcastproducer/recordings/create
  * Type : POST
  * Content : version=2&workflow_uuid=C6EF52A7-04E3-477D-9F38-6B61F108D7B9
  * Response :
  <pre>
  <podcast_producer_result>
  <action>create</action>
  <status>success</status>
  <results>OK</results>
  <plist version="1.0">
  <dict>
  <key>workflow_uuid</key>
  <string>C6EF52A7-04E3-477D-9F38-6B61F108D7B9</string>
  <key>recording_uuid</key>
  <string>FD5A1459-F7CE-41FA-8155-049DF774298B</string>
  <key>submission_uuids</key>
  <array>
  <string>A626D8E4-E439-4E57-9982-DB4BD035CB41</string>
  <string>CFBCCB74-A41F-42D3-BEAA-58165B1116C6</string>
  </array>
  </dict>
  </plist>
  </podcast_producer_result>
  </pre>

• Resurrecting SCD

  6 août 2010, par Multimedia Mike — Reverse Engineering

  When I became interested in reverse engineering all the way back in 2000, the first Win32 disassembler I stumbled across was simply called "Win32 Program Disassembler" authored by one Sang Cho. I took to calling it ’scd’ for Sang Cho’s Disassembler. The original program versions and source code are still available for download. I remember being able to compile v0.23 of the source code with gcc under Unix ; 0.25 is no go due to extensive reliance on the Win32 development environment.

  I recently wanted to use scd again but had some trouble compiling. As was the case the first time I tried compiling the source code a decade ago, it’s necessary to transform line endings from DOS -> Unix using ’dos2unix’ (I see that this has been renamed to/replaced by ’fromdos’ on Ubuntu).

  Beyond this, it seems that there are some C constructs that used to be valid but are now rejected by gcc. The first looks like this :

  PLAIN TEXT

  C :

  1. return (int) c = *(PBYTE)((int)lpFile + vCodeOffset) ;

  Ahem, "error : lvalue required as left operand of assignment". Removing the "(int)" before the ’c’ makes the problem go away. It’s a strange way to write a return statement in general. However, ’c’ is a global variable that is apparently part of some YACC/BISON-type output.

  The second issue is when a case-switch block has a default label but with no code inside. Current gcc doesn’t like that. It’s necessary to at least provide a break statement after the default label.

  Finally, the program turns out to not be 64-bit safe. It is necessary to compile it in 32-bit mode (compile and link with the ’-m32’ flag or build on a 32-bit system). The static 32-bit binary should run fine under a 64-bit kernel.

  Alternatively : What are some other Win32 disassemblers that work under Linux ?

• Error in converting audio file format from ogg to wav [on hold]

  9 juin 2014, par Sumit Bisht

  I am trying to convert an ogg format file that was created using webrtc (html5 usermedia content generated on firefox) and transferred and decoded on the server into a wav file through ffmpeg but am getting this error on cmmand line while trying to convert :

  $ ffmpeg -i 2014-6-5_16-17-54.ogg res1.wav
  
  ffmpeg version 2.0.1 Copyright (c) 2000-2013 the FFmpeg developers
  
    built on May  1 2014 13:12:12 with gcc 4.4.7 (GCC) 20120313 (Red Hat 4.4.7-4)
  
    configuration: --enable-gpl --enable-version3 --enable-shared --enable-nonfree --enable-postproc --enable-libfaac --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxvid
  
    libavutil      52. 38.100 / 52. 38.100
  
    libavcodec     55. 18.102 / 55. 18.102
  
    libavformat    55. 12.100 / 55. 12.100
  
    libavdevice    55.  3.100 / 55.  3.100
  
    libavfilter     3. 79.101 /  3. 79.101
  
    libswscale      2.  3.100 /  2.  3.100
  
    libswresample   0. 17.102 /  0. 17.102
  
    libpostproc    52.  3.100 / 52.  3.100
  
  Guessed Channel Layout for  Input Stream #0.0 : mono
  
  Input #0, ogg, from '2014-6-5_16-17-54.ogg':
  
    Duration: 00:00:01.84, start: 0.000000, bitrate: 18 kb/s
  
      Stream #0:0: Audio: opus, 48000 Hz, mono
  
      Metadata:
  
        ENCODER         : Mozilla29.0.1
  
  [graph 0 input from stream 0:0 @ 0x18dca20] Invalid sample format (null)
  
  Error opening filters!

  Although, I am able to play the file on server and using the same command, am able to convert .ogg files generated somewhere else. What might be I missing ?

  Edit :
  Here’s the source code that is used to write to the file :

  1) During startup - use the methods of getUserMedia API.

  navigator.getUserMedia({
  
          audio: true,
  
          video: false
  
      }, function(stream) {
  
          audioStream = RecordRTC(stream, {
  
              bufferSize: 16384
  
          });
  
          audioStream.startRecording();

  2) During stopping of the recording - extracting the recorded information.

  function(audioDataURL) {
  
       var audioFile = {};
  
       audioFile = {
  
         contents: audioDataURL
  
       **strong text**};

  On server end, the following code is creating a file from this data :

  dataURL = dataURL.split(',').pop(); // dataURL is the audioDataURL as defined above
  
  fileBuffer = new Buffer(dataURL, 'base64');
  
  fs.writeFileSync(filePath, fileBuffer);