do not call (av_)abort()

Originally committed as revision 3543 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/common.c

@@ -190,7 +190,7 @@ static int build_table(VLC *vlc, int table_nb_bits,
 #endif
                     if (table[j][1] /*bits*/ != 0) {
                         av_log(NULL, AV_LOG_ERROR, "incorrect codes\n");
-                        av_abort();
+                        return -1;
                     }
                     table[j][1] = n; //bits
                     table[j][0] = i; //code

libavcodec/mpegaudio.c

@@ -466,7 +466,7 @@ static void compute_scale_factors(unsigned char scale_code[SBLIMIT],
             sf[1] = sf[2] = sf[0];
             break;
         default:
-            av_abort();
+            assert(0); //cant happen
         }
         
 #if 0

libavcodec/utils.c

@@ -726,7 +726,8 @@ void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode)
         bitrate = enc->bit_rate;
         break;
     default:
-        av_abort();
+        snprintf(buf, buf_size, "Invalid Codec type %d", enc->codec_type);
+        return;
     }
     if (encode) {
         if (enc->flags & CODEC_FLAG_PASS1)

libavcodec/xvmcvideo.c

@@ -136,7 +136,7 @@ const int mb_xy = s->mb_y * s->mb_stride + s->mb_x;
 
     if(s->encoding){
         av_log(s->avctx, AV_LOG_ERROR, "XVMC doesn't support encoding!!!\n");
-	av_abort();
+        return -1;
     }
 
    //from MPV_decode_mb(),