I am trying to implement a web application that allows the user to playback
WAV files inside a web browser.
- The file server stores audio files as GSM 6.10 or TrueSpeech encoded WAV
- The web server (most probably ASP.NET on IIS) offers the client the
ability to search audio files on the file server (a different machine).
- The client will be equiped with internet explorer and a standard Media
Player plugin (preferably Windows Media Player or QuickTime).
The requirements for this application are:
1. The client should be able to playback a WAV file with a media player
plugin in the web browser.
2. The WAV file should NOT be accessible to the client, the URL to the WAV
file should not be accessible / visible
3. The WAV file should NOT be downloaded
4. The WAV file should NOT be cached on the client hard disk
No Progressive download!
Because of requirement 2, we can NOT do this:
<object id="player" height="45" width="220"
<param name="url" value="audio/GSM.wav" />
because the user can copy-paste the file location from the source code, and
easilly download the file.
Because of requirement 3 and 4, pseudo streaming like the following (an
asp.net example) is NOT allowed, because the complete file is still
downloaded to the client:
<object id="RPPlayer" height="200" width="220"
<param name="type" value="audio/wav" />
<param name="src" value="audioStream.aspx" />
So having excluded downloading and pseudo-streaming (a.k.a. http-streaming
a.k.a. progressive download) the logical next step is 'real' (on demand)
The limitation that we come across when using standard Streaming Servers
(like Windows Media Services or QuickTime) is that they can not stream WAV
The WAV files always have to be encoded to a streamable format (WMA for
windows media service, or MOV for QuickTime/Darwin, etc) before they can be
Converting the complete file server from WAV to a streaming format (WMA, MOV
or whatever) is not an option (because the file server is being populated
with new WAV files continuously; this process is 'hardware-driven' and
extremely hard to adjust). We will stick to the WAV file format for now.
So what I'm really looking for is one of the following:
(a) a streaming server that can stream WAV files.
Does this exist or is it technically impossible to stream WAV files? Why?
(b) or a way to convert WAV to a streamable format on the fly
(programmatically, 'inside' the streaming server), when the user requests
the WAV file.
I have no problem with converting WAV on the fly,
- but the conversion should never take more than a few seconds for a one MB
WAV file (= 10 minutes in our case),
- and I would like to hear experiences from other developers that have done
this, before I invest a lot of time in this and bump into unforeseen
problems when I'm halfway.
I noticed that a 10 minute WAV file which is 1MB in size takes about
- 3 seconds to convert to MOV with QuickTime Pro (I think this can be
programmed into the Darwin streaming server)
- 25 seconds to convert to WMA with the Windows Media Encoder (could be
programmed with the Windows Media SDK but 25 seconds takes way too much
(c) or a completely different approach, like streaming over HTTP with to
I can not find any examples on the web, and think this might be the most
time-consuming solution of all?
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