[SCM] libav/experimental: Add a few comments pointing to the G.728 specification

[siretart at users.alioth.debian.org]

The following commit has been merged in the experimental branch:
commit b26d3205835c3d66f655247d00044658d5e58e51
Author: Vitor Sessak <vitor1001 at gmail.com>
Date:   Sun Jul 27 22:22:51 2008 +0000

    Add a few comments pointing to the G.728 specification
    
    Originally committed as revision 14444 to svn://svn.ffmpeg.org/ffmpeg/trunk

diff --git a/libavcodec/ra288.c b/libavcodec/ra288.c
index 10f5ca7..36d0b60 100644
--- a/libavcodec/ra288.c
+++ b/libavcodec/ra288.c
@@ -74,11 +74,13 @@ static void decode(RA288Context *ractx, float gain, int cb_coef)
         ractx->sb[x] = -scalar_product_float(ractx->sb + x + 1,
                                              ractx->sp_lpc, 36);
 
-    /* convert log and do rms */
+    /* block 46 of G.728 spec */
     sum = 32. - scalar_product_float(ractx->gain_lpc, ractx->lhist, 10);
 
+    /* block 47 of G.728 spec */
     sum = av_clipf(sum, 0, 60);
 
+    /* block 48 of G.728 spec */
     sumsum = exp(sum * 0.1151292546497) * gain;    /* pow(10.0,sum/20)*f */
 
     for (x=0; x < 5; x++)

-- 
Libav/FFmpeg packaging