File ffmpeg_fix_wmadecoding.diff of Package ffmpeg

File ffmpeg_fix_wmadecoding.diff of Package ffmpeg (Revision 9b902cde571dafbc5cc0381321562f67)

Currently displaying revision 9b902cde571dafbc5cc0381321562f67, show latest

--- libavcodec/wmadec.c.orig	2008-08-12 21:38:07.000000000 +0200
+++ libavcodec/wmadec.c	2008-08-15 16:56:01.000000000 +0200
@@ -403,13 +403,13 @@
         v |= a;
     }
 
-    bsize = s->frame_len_bits - s->block_len_bits;
-
     /* if no channel coded, no need to go further */
     /* XXX: fix potential framing problems */
     if (!v)
         goto next;
 
+    bsize = s->frame_len_bits - s->block_len_bits;
+
     /* read total gain and extract corresponding number of bits for
        coef escape coding */
     total_gain = 1;
@@ -681,28 +681,27 @@
         }
     }
 
-next:
     for(ch = 0; ch < s->nb_channels; ch++) {
-        int n4, index, n;
 
-        n = s->block_len;
-        n4 = s->block_len / 2;
         if(s->channel_coded[ch]){
+            int n4, index, n;
+            n = s->block_len;
+            n4 = s->block_len / 2;
             ff_imdct_calc(&s->mdct_ctx[bsize], s->output, s->coefs[ch]);
-        }else
-            memset(s->output, 0, sizeof(s->output));
 
-        /* multiply by the window and add in the frame */
-        index = (s->frame_len / 2) + s->block_pos - n4;
-        wma_window(s, &s->frame_out[ch][index]);
-
-        /* specific fast case for ms-stereo : add to second
-            channel if it is not coded */
-        if (s->ms_stereo && !s->channel_coded[1]) {
-            wma_window(s, &s->frame_out[1][index]);
+            /* multiply by the window and add in the frame */
+            index = (s->frame_len / 2) + s->block_pos - n4;
+            wma_window(s, &s->frame_out[ch][index]);
+
+            /* specific fast case for ms-stereo : add to second
+               channel if it is not coded */
+            if (s->ms_stereo && !s->channel_coded[1]) {
+                wma_window(s, &s->frame_out[1][index]);
+            }
         }
     }
 
+next:
     /* update block number */
     s->block_num++;
     s->block_pos += s->block_len;
@@ -784,11 +783,6 @@
         skip_bits(&s->gb, 4); /* super frame index */
         nb_frames = get_bits(&s->gb, 4) - 1;
 
-        if((nb_frames+1) * s->nb_channels * s->frame_len * sizeof(int16_t) > *data_size){
-            av_log(s->avctx, AV_LOG_ERROR, "Insufficient output space\n");
-            goto fail;
-        }
-
         bit_offset = get_bits(&s->gb, s->byte_offset_bits + 3);
 
         if (s->last_superframe_len > 0) {
@@ -844,10 +838,6 @@
         s->last_superframe_len = len;
         memcpy(s->last_superframe, buf + pos, len);
     } else {
-        if(s->nb_channels * s->frame_len * sizeof(int16_t) > *data_size){
-            av_log(s->avctx, AV_LOG_ERROR, "Insufficient output space\n");
-            goto fail;
-        }
         /* single frame decode */
         if (wma_decode_frame(s, samples) < 0)
             goto fail;