1 files changed, 106 insertions, 0 deletions

diff --git a/apps/codecs/libffmpegFLAC/golomb.h b/apps/codecs/libffmpegFLAC/golomb.h
new file mode 100644
index 0000000000..9dcbcb2d54
--- /dev/null
+++ b/apps/codecs/libffmpegFLAC/golomb.h
@@ -0,0 +1,106 @@
+/*
+ * exp golomb vlc stuff
+ * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
+ * Copyright (c) 2004 Alex Beregszaszi
+ *
+ * This library 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 of the License, or (at your option) any later version.
+ *
+ * This library 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 this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ */
+
+
+/* From libavutil/common.h */
+extern const uint8_t ff_log2_tab[256];
+static inline int av_log2(unsigned int v)
+{
+    int n;
+
+    n = 0;
+    if (v & 0xffff0000) {
+        v >>= 16;
+        n += 16;
+    }
+    if (v & 0xff00) {
+        v >>= 8;
+        n += 8;
+    }
+    n += ff_log2_tab[v];
+
+    return n;
+}
+
+/**
+ * @file golomb.h
+ * @brief 
+ *     exp golomb vlc stuff
+ * @author Michael Niedermayer <michaelni@gmx.at> and Alex Beregszaszi
+ */
+
+ 
+/**
+ * read unsigned golomb rice code (jpegls).
+ */
+static inline int get_ur_golomb_jpegls(GetBitContext *gb, int k, int limit, int esc_len){
+    unsigned int buf;
+    int log;
+    
+    OPEN_READER(re, gb);
+    UPDATE_CACHE(re, gb);
+    buf=GET_CACHE(re, gb);
+
+    log= av_log2(buf);
+    
+    if(log > 31-11){
+        buf >>= log - k;
+        buf += (30-log)<<k;
+        LAST_SKIP_BITS(re, gb, 32 + k - log);
+        CLOSE_READER(re, gb);
+    
+        return buf;
+    }else{
+        int i;
+        for(i=0; SHOW_UBITS(re, gb, 1) == 0; i++){
+            LAST_SKIP_BITS(re, gb, 1);
+            UPDATE_CACHE(re, gb);
+        }
+        SKIP_BITS(re, gb, 1);
+
+        if(i < limit - 1){
+            if(k){
+                buf = SHOW_UBITS(re, gb, k);
+                LAST_SKIP_BITS(re, gb, k);
+            }else{
+                buf=0;
+            }
+
+            CLOSE_READER(re, gb);
+            return buf + (i<<k);
+        }else if(i == limit - 1){
+            buf = SHOW_UBITS(re, gb, esc_len);
+            LAST_SKIP_BITS(re, gb, esc_len);
+            CLOSE_READER(re, gb);
+    
+            return buf + 1;
+        }else
+            return -1;
+    }
+}
+
+/**
+ * read signed golomb rice code (flac).
+ */
+static inline int get_sr_golomb_flac(GetBitContext *gb, int k, int limit, int esc_len){
+    int v= get_ur_golomb_jpegls(gb, k, limit, esc_len);
+    return (v>>1) ^ -(v&1);
+}