Re: [pygame] How to play a sound from a "file" of infinite size?

[Rene Dudfield <renesd@xxxxxxxxx>]

Check out the StringIO and cStringIO modules.  They can make a file
like object from a string.

On 2/7/06, Tomasz Primke <tprimke@xxxxxxxxxx> wrote:
> I'd like to write a player, that would be able to play files in some rare
> format. I have a library (written in C), that can be used to play such a
> files, but I'm not sure about the way that I should use PyGame to code my
> player.
>
> On a GNU/Linux system, soundcard (a device) is a file /dev/dsp. When someone
> wants to play a wav file, all that must be done is write this wav file to
> this device:
>
>   $ dd if=file.wav of=/dev/dsp
>
> when "if" means the input file, and "of" means the output file (the dd
> command reads the input file and write its content to the output file).
>
> In the program written in C all the playing is done as follows:
>
>   char buffer[size]; // size = 20-40 kB
>   while (1)
>    {
>     render_buffer( buffer, size );
>     play_buffer( buffer );
>    }
>
> On GNU/Linux all the play_buffer function does is write the buffer to the
> /dev/dsp file (so the result is the same as with the dd command shown
> before).
>
>
> I could implement playing by wrapping all the code (written in C) in Python,
> but I'm afraid, that it would work on GNU/Linux only (because of this
> writting to the /dev/dsp file). Although I want to write a player for that
> system, I don't like the idea of giving up the portability of this
> application so easily.
>
> In PyGame documentation I have found the function pygame.mixer.Sound, that
> "loads a new sound object from a WAV file. File can be a filename or a
> file-like object. (...)". So I thought, that this file-like object idea
> sounds interesting. The problem is that I have never implemented such an
> object yet and I'm not sure how to do it.
>
> As I suppose, a file-like object is an object, that implements all the
> methods described in Python's documentation (point 2.3.9, "File Objects").
> I think I could implement such a class, but the problem is that the buffer
> from the example shown above can be "rendered" forever - so this
> file-object would be of infinite size. The question is: would the
> pygame.mixer.Sound function load such a file-like object?
>