bug#74863: 31.0.50; Problems with play-sound on MS-Windows

[Eli Zaretskii <eliz@gnu.org>]

> Date: Sun, 15 Dec 2024 12:55:35 +0100
> Cc: 74863@debbugs.gnu.org
> From: Cecilio Pardo <cpardo@imayhem.com>
> 
> This patch adds support for :data using PlaySound, keeping the current 
> code for files.

Thanks.

> It also fixes a problem in the handling of the volume. Let me know if I 
> have to make a separate patch/bug.

No need.

> To test:
> 
> (defun load-file-into-unibyte-string (file-path)
>    (with-temp-buffer
>      (set-buffer-multibyte nil)
>      (insert-file-contents file-path)
>      (buffer-string)))
> 
> (play-sound `(sound :data ,(load-file-into-unibyte-string "awav.wav") 
> :volume 100))

What's wrong with insert-file-contents-literally?

> +  if (in_memory)
> +    i_result = !PlaySound (psz_file_or_data, NULL, SND_MEMORY);

AFAIU, the documentation seems to say that the string passed as the
first argument to PlaySound is limited to 256 characters (i.e. bytes)?
If so, how do we play longer sounds?

Should we also use SND_SENTRY flag (on Vista and later)?