Re: Next question about binary files/combining them, etc.

Ok, thanks for suggestions/links etc. - think just had maybe not approached
it perfectly in past, but, here's now a test version:
http://www.blindza.co.za/TTS/

Found the relevant code/example on this page:
http://www.splitbrain.org/blog/2006-11/15-joining_wavs_with_php

And, if interested, the source code in the bgsound.php file which is the one
I am calling as the src value for the bgsound element in the page inside the
hidden iframe, is the following:
<?php
function joinWavs($wavs){
    $fields = join('/',array( 'H8ChunkID', 'VChunkSize', 'H8Format',
                              'H8Subchunk1ID', 'VSubchunk1Size',
                              'vAudioFormat', 'vNumChannels', 'VSampleRate',
                              'VByteRate', 'vBlockAlign',
'vBitsPerSample' ));
    $data = '';
    foreach($wavs as $wav){
        $fp     = fopen($wav,'rb');
        $header = fread($fp,36);
        $info   = unpack($fields,$header);
        // read optional extra stuff
        if($info['Subchunk1Size'] > 16){
            $header .= fread($fp,($info['Subchunk1Size']-16));
        }
        // read SubChunk2ID
        $header .= fread($fp,4);
        // read Subchunk2Size
        $size  = unpack('vsize',fread($fp, 4));
        $size  = $size['size'];
        // read data
        $data .= fread($fp,$size);
    }
    return $header.pack('V',strlen($data)).$data;
}
if (isset($_GET["str"])) {
$arFiles = array();
for ($I = 0; $I < strlen($_GET["str"]); $I++) {
if (is_numeric($_GET["str"][$I])) {
array_push($arFiles, "./sClips/" . $_GET["str"][$I] . ".wav");
}
}
$outgoing = joinWavs($arFiles);
header("Content-Type: audio/x-wav");
header("Content-Disposition: attachment; filename=dynamic.wav");
header('Content-Transfer-Encoding: binary');
header('Expires: 0');
header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
header('Pragma: public');
header('Content-Length: ' . strlen( $outgoing));
echo $outgoing;
}
?>

And, those numeric sound clips are not necessarily perfect in terms of file
size, etc., but they were just test ones I generated quickly for testing
this with.

Stay well

Jacob Kruger
Blind Biker
Skype: BlindZA
'...fate had broken his body, but not his spirit...'

----- Original Message ----- 
From: "Gavin Chalkley" <[email protected]>
To: <[email protected]>
Sent: Sunday, May 13, 2012 5:12 PM
Subject: RE: [PHP-WIN] Next question about binary files/combining them, etc.


> Give this a go:
>
> http://lmgtfy.com/?q=combining+sound+files+on+the+fly+with+PHP
>
> -----Original Message-----
> From: Jacob Kruger [mailto:[email protected]]
> Sent: 13 May 2012 12:48
> To: [email protected]
> Subject: Re: [PHP-WIN] Next question about binary files/combining them,
> etc.
>
> Thanks.
>
> Will check out those things, and, yes, know of stack overflow, but not
> always easiest to find completely useful info on that site...:)
>
> Aside from that, this is more to do with adding things like spoken sound
> effects to pages, etc. using small sound clips of TTS output using the
> various voices/synthesizers I have here - have like 20 different voices
> might want to try use, and the idea is to literally sort of mix short
> sentences/phrases together, etc., but aside from hardcoding all the
> different, complete sound clips, the idea would be to sort of mix a
> somewhat
> limited dictionary/collection together into various combinations, but,
> they
> wouldn't be huge files in terms of file size/bandwidth, etc., and would
> most
> likely either load them into soundManager using JQuery, or load them sort
> of
> dynamically as  BGSound sources for something like a somewhat hidden
> inline
> frame, etc.
>
> Thanks again
>
> STay well
>
> Jacob Kruger
> Blind Biker
> Skype: BlindZA
> '...fate had broken his body, but not his spirit...'
>
> ----- Original Message -----
> From: "Carl Roett" <[email protected]>
> To: <[email protected]>
> Sent: Sunday, May 13, 2012 11:55 AM
> Subject: [PHP-WIN] Next question about binary files/combining them, etc.
>
>
>> Depending on what you're building, it could be very easy or extremely
>> difficult. When posting on mailing lists, you need to give other
>> developers more information about your application so we can give you
>> useful information.
>>
>> Also, for general web-dev questions, sites like stackoverflow.com can
>> usually provide better answers, and if you're unfamiliar with google's
>> site: and inurl:
>> operators<http://support.google.com/websearch/bin/answer.py?hl=en&p=ad
>> v_operators&answer=136861>, learning how to use them will make your
>> life immensely easier.
>>
>> First off, are you doing this in the client (web browser) or the server?
>> For mixing audio files on the server side, you'd want to use ffMPEG +
>> whatever PHP interface library you prefer to control it. You would use
>> either uncompressed WAV files or a compressed format like MP3
>> depending on how disk-bound the server is.
>>
>> For the client side, you would never send the data as a WAV file
>> because it would use 10 times as much bandwidth as a MP3. Most
>> developers would use Adobe Flash to load the files and mix them. You
>> could also experiment with HTML5, but the majority of browsers
>> *currently in use* don't have enough
>> HTML5 audio support to get the job done. See the Wikipedia article on
>> HTML5.
>>
>> Another consideration is the number and size of audio files. If you're
>> using simple HTML GET requests to fetch your files, you can't use a
>> file until the *entire* file has been transferred. If you have big
>> files or lots of files, this could be a problem. The usual solution is
>> to use a streaming server like RED5 or LightHTTPD's progressive
>> download. Look it up on Wikipedia.
>>
>> Saving the output to disk is another consideration. If you have to do
>> this, the only practical option would be to do it on the server side.
>> Writing code to decompress an audio file, mix it, and re-compress it
>> in Adobe Flash or JavaScript would be a massive project.
>>
>> So, in terms of "simple/doable" ...depending on whether you're trying
>> to mix sound-effects for a hack-a-thon web game, or whether you're
>> trying to build an online DJ mixing system ...you're looking at
>> anything from a full day's work to a 5-year project.
>>
>> ^C^
>>
>>
>> ===========================================================
>>
>>
>> How simple/doable would it be to do something like sort of dynamically
>> combine multiple .wav files into a single file/output track?
>>
>> Know that should be doable, but firstly wonder if something like .wav
>> files could be combined into one sort of output file, or if it might
>> be better to rather trigger their playback using something like
>> JQuery, or something so they then seemed to be combined, but while
>> still separate..?
>>
>> Stay well
>>
>
>
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