add more OKed parts of the E-AC-3 decoder: structural changes to support AHT mode mantissa decoding

Originally committed as revision 14989 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/ac3dec.c

@@ -443,7 +443,7 @@ typedef struct {
  * Get the transform coefficients for a particular channel
  * reference: Section 7.3 Quantization and Decoding of Mantissas
  */
-static void decode_transform_coeffs_ch(AC3DecodeContext *s, int ch_index, mant_groups *m)
+static void ac3_decode_transform_coeffs_ch(AC3DecodeContext *s, int ch_index, mant_groups *m)
 {
     GetBitContext *gbc = &s->gbc;
     int i, gcode, tbap, start, end;
@@ -548,7 +548,6 @@ static void remove_dithering(AC3DecodeContext *s) {
     }
 }
 
-#if 0
 static void decode_transform_coeffs_ch(AC3DecodeContext *s, int blk, int ch,
                                     mant_groups *m)
 {
@@ -558,19 +557,20 @@ static void decode_transform_coeffs_ch(AC3DecodeContext *s, int blk, int ch,
         /* if AHT is used, mantissas for all blocks are encoded in the first
            block of the frame. */
         int bin;
+        /*
         if (!blk)
             ff_eac3_decode_transform_coeffs_aht_ch(s, ch);
+        */
         for (bin = s->start_freq[ch]; bin < s->end_freq[ch]; bin++) {
             s->fixed_coeffs[ch][bin] = s->pre_mantissa[ch][bin][blk] >> s->dexps[ch][bin];
         }
     }
 }
-#endif
 
 /**
  * Get the transform coefficients.
  */
-static void decode_transform_coeffs(AC3DecodeContext *s)
+static void decode_transform_coeffs(AC3DecodeContext *s, int blk)
 {
     int ch, end;
     int got_cplchan = 0;
@@ -580,12 +580,12 @@ static void decode_transform_coeffs(AC3DecodeContext *s)
 
     for (ch = 1; ch <= s->channels; ch++) {
         /* transform coefficients for full-bandwidth channel */
-        decode_transform_coeffs_ch(s, ch, &m);
+        decode_transform_coeffs_ch(s, blk, ch, &m);
         /* tranform coefficients for coupling channel come right after the
            coefficients for the first coupled channel*/
         if (s->channel_in_cpl[ch])  {
             if (!got_cplchan) {
-                decode_transform_coeffs_ch(s, CPL_CH, &m);
+                decode_transform_coeffs_ch(s, blk, CPL_CH, &m);
                 calc_transform_coeffs_cpl(s);
                 got_cplchan = 1;
             }
@@ -1075,7 +1075,7 @@ static int decode_audio_block(AC3DecodeContext *s, int blk)
 
     /* unpack the transform coefficients
        this also uncouples channels if coupling is in use. */
-    decode_transform_coeffs(s);
+    decode_transform_coeffs(s, blk);
 
     /* TODO: generate enhanced coupling coordinates and uncouple */