Rich Rattanni wrote:
> Claudio:
> This morning Shane and I recompiled libvorbis and FusionSound with
> the -msoft-float option. It did not have any effect on the audio (still
> sounds distorted). I tried using both my application and music.c to
> play audio. (was recompiling libvorbis and FusionSound with
> -msoft-float all that was required?)
>
I'm not expert about gcc's internals, but if float emulation is
implemented using 16.16 fixed point numbers, it doesn't work because
FusionSound requires larger integer part: internally volume is
represented as a 9.23 fixed point number, therefore the floating value
must be multiplied by 2^23 to obtain the internal value (this happens in
src/core/playback.c, fs_playback_set_volume()).
If my assumption is right, the attached patch should fix the problem.
BTW:
Right today, I have added support for using the Tremor decoder in the
vorbis music provider. Unlike libvorbis, this is an integers based
decoder, so it's optimal for embedded devices without a FPU.
Get it from xiph's svn (http://svn.xiph.org/trunk/Tremor/)
--
Regards,
Claudio Ciccani
[EMAIL PROTECTED]
http://directfb.org
http://sf.net/projects/php-directfb
--- FusionSound/src/core/playback.c 2007-03-05 17:23:47.000000000 +0100
+++ /home/klan/src/FusionSound/src/core/playback.c 2007-03-05 17:48:54.000000000 +0100
@@ -280,6 +280,8 @@
float left,
float right )
{
+ int l, r;
+
D_ASSERT( playback != NULL );
D_ASSERT( left >= 0.0f );
D_ASSERT( left <= 64.0f );
@@ -291,8 +293,10 @@
return DFB_FUSION;
/* Adjust volume. */
- playback->left = fsf_from_float( left );
- playback->right = fsf_from_float( right );
+ l = left * 256.f + 0.5f;
+ r = right * 256.f + 0.5f;
+ playback->left = fsf_from_int_scaled( l, 8 );
+ playback->right = fsf_from_int_scaled( r, 8 );
/* Unlock playback. */
fusion_skirmish_dismiss( &playback->lock );
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