From f40bfc9267b13b54e6379dfe7539447662879d24 Mon Sep 17 00:00:00 2001
From: Sean Bartell <wingedtachikoma@gmail.com>
Date: Sat, 25 Jun 2011 21:32:25 -0400
Subject: Add codecs to librbcodec.
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Change-Id: Id7f4717d51ed02d67cb9f9cb3c0ada4a81843f97
Reviewed-on: http://gerrit.rockbox.org/137
Reviewed-by: Nils Wallménius <nils@rockbox.org>
Tested-by: Nils Wallménius <nils@rockbox.org>
---
 lib/rbcodec/codecs/libffmpegFLAC/golomb.h | 110 ++++++++++++++++++++++++++++++
 1 file changed, 110 insertions(+)
 create mode 100644 lib/rbcodec/codecs/libffmpegFLAC/golomb.h

(limited to 'lib/rbcodec/codecs/libffmpegFLAC/golomb.h')

diff --git a/lib/rbcodec/codecs/libffmpegFLAC/golomb.h b/lib/rbcodec/codecs/libffmpegFLAC/golomb.h
new file mode 100644
index 0000000000..197b78ee1c
--- /dev/null
+++ b/lib/rbcodec/codecs/libffmpegFLAC/golomb.h
@@ -0,0 +1,110 @@
+/*
+ * 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
+ *
+ */
+
+#include <limits.h>
+#include "codeclib.h"
+
+/**
+ * @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 - 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);
+        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);
+}
+
+/**
+ * read unsigned golomb rice code (shorten).
+ */
+#define get_ur_golomb_shorten(gb, k) get_ur_golomb_jpegls(gb, k, INT_MAX, 0)
+/*
+static inline unsigned int get_ur_golomb_shorten(GetBitContext *gb, int k){
+    return get_ur_golomb_jpegls(gb, k, INT_MAX, 0);
+}
+*/
+
+/**
+ * read signed golomb rice code (shorten).
+ */
+static inline int get_sr_golomb_shorten(GetBitContext* gb, int k)
+{
+    int uvar = get_ur_golomb_jpegls(gb, k + 1, INT_MAX, 0);
+    if (uvar & 1)
+        return ~(uvar >> 1);
+    else
+        return uvar >> 1;
+}
-- 
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