Make aac_decode_frame() consume zero padding at the end of a packet.

Originally committed as revision 23195 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/aac.c

@@ -1954,6 +1954,7 @@ static int aac_decode_frame(AVCodecContext *avccontext, void *data,
     int err, elem_id, data_size_tmp;
     int buf_consumed;
     int samples = 1024, multiplier;
+    int buf_offset;
 
     init_get_bits(&gb, buf, buf_size * 8);
 
@@ -2065,7 +2066,11 @@ static int aac_decode_frame(AVCodecContext *avccontext, void *data,
         ac->output_configured = OC_LOCKED;
 
     buf_consumed = (get_bits_count(&gb) + 7) >> 3;
-    return buf_size > buf_consumed ? buf_consumed : buf_size;
+    for (buf_offset = buf_consumed; buf_offset < buf_size; buf_offset++)
+        if (buf[buf_offset])
+            break;
+
+    return buf_size > buf_offset ? buf_consumed : buf_size;
 }
 
 static av_cold int aac_decode_close(AVCodecContext *avccontext)