X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=libavcodec%2Fgolomb.h;h=83d277f963e6b390c1541c804b4c5bd78f3b482a;hb=921715edffbba5db8deb26b7ad3cb583ba963d03;hp=f2fb8928a2e98bb0444f91346c85982efbfbdf97;hpb=631e8afb8c59a0759e57ade1c8a910bb46e0fd6d;p=ffmpeg

diff --git a/libavcodec/golomb.h b/libavcodec/golomb.h
index f2fb8928a2e..83d277f963e 100644
--- a/libavcodec/golomb.h
+++ b/libavcodec/golomb.h
@@ -3,25 +3,25 @@
  * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
  * Copyright (c) 2004 Alex Beregszaszi
  *
- * This file is part of FFmpeg.
+ * This file is part of Libav.
  *
- * FFmpeg is free software; you can redistribute it and/or
+ * Libav is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
  *
- * FFmpeg is distributed in the hope that it will be useful,
+ * Libav is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
- * License along with FFmpeg; if not, write to the Free Software
+ * License along with Libav; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 /**
- * @file golomb.h
+ * @file
  * @brief
  *     exp golomb vlc stuff
  * @author Michael Niedermayer <michaelni@gmx.at> and Alex Beregszaszi
@@ -31,7 +31,8 @@
 #define AVCODEC_GOLOMB_H
 
 #include <stdint.h>
-#include "bitstream.h"
+#include "get_bits.h"
+#include "put_bits.h"
 
 #define INVALID_VLC           0x80000000
 
@@ -74,6 +75,24 @@ static inline int get_ue_golomb(GetBitContext *gb){
     }
 }
 
+ /**
+ * read unsigned exp golomb code, constraint to a max of 31.
+ * the return value is undefined if the stored value exceeds 31.
+ */
+static inline int get_ue_golomb_31(GetBitContext *gb){
+    unsigned int buf;
+
+    OPEN_READER(re, gb);
+    UPDATE_CACHE(re, gb);
+    buf=GET_CACHE(re, gb);
+
+    buf >>= 32 - 9;
+    LAST_SKIP_BITS(re, gb, ff_golomb_vlc_len[buf]);
+    CLOSE_READER(re, gb);
+
+    return ff_ue_golomb_vlc_code[buf];
+}
+
 static inline int svq3_get_ue_golomb(GetBitContext *gb){
     uint32_t buf;
 
@@ -234,8 +253,12 @@ static inline int get_ur_golomb(GetBitContext *gb, int k, int limit, int esc_len
 
         return buf;
     }else{
-        buf >>= 32 - limit - esc_len;
-        LAST_SKIP_BITS(re, gb, esc_len + limit);
+        LAST_SKIP_BITS(re, gb, limit);
+        UPDATE_CACHE(re, gb);
+
+        buf = SHOW_UBITS(re, gb, esc_len);
+
+        LAST_SKIP_BITS(re, gb, esc_len);
         CLOSE_READER(re, gb);
 
         return buf + limit - 1;
@@ -255,7 +278,7 @@ static inline int get_ur_golomb_jpegls(GetBitContext *gb, int k, int limit, int
 
     log= av_log2(buf);
 
-    if(log - k >= 32-MIN_CACHE_BITS){
+    if(log - k >= 32-MIN_CACHE_BITS+(MIN_CACHE_BITS==32) && 32-log < limit){
         buf >>= log - k;
         buf += (30-log)<<k;
         LAST_SKIP_BITS(re, gb, 32 + k - log);