Rename ffmpeg-4.2-fit to ffmpeg-4-fit

trunk/3rdparty/ffmpeg-4-fit/libavcodec/rl.h

@@ -0,0 +1,87 @@
+/*
+ * Copyright (c) 2000-2002 Fabrice Bellard
+ * Copyright (c) 2002-2004 Michael Niedermayer
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg 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,
+ * 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
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file
+ * rl header.
+ */
+
+#ifndef AVCODEC_RL_H
+#define AVCODEC_RL_H
+
+#include <stdint.h>
+
+#include "vlc.h"
+
+/* run length table */
+#define MAX_RUN    64
+#define MAX_LEVEL  64
+
+/** RLTable. */
+typedef struct RLTable {
+    int n;                         ///< number of entries of table_vlc minus 1
+    int last;                      ///< number of values for last = 0
+    const uint16_t (*table_vlc)[2];
+    const int8_t *table_run;
+    const int8_t *table_level;
+    uint8_t *index_run[2];         ///< encoding only
+    int8_t *max_level[2];          ///< encoding & decoding
+    int8_t *max_run[2];            ///< encoding & decoding
+    RL_VLC_ELEM *rl_vlc[32];       ///< decoding only
+} RLTable;
+
+/**
+ * @param static_store static uint8_t array[2][2*MAX_RUN + MAX_LEVEL + 3] which will hold
+ *                     the level and run tables, if this is NULL av_malloc() will be used
+ */
+int ff_rl_init(RLTable *rl, uint8_t static_store[2][2*MAX_RUN + MAX_LEVEL + 3]);
+void ff_rl_init_vlc(RLTable *rl, unsigned static_size);
+
+/**
+ * Free the contents of a dynamically allocated table.
+ */
+void ff_rl_free(RLTable *rl);
+
+#define INIT_VLC_RL(rl, static_size)\
+{\
+    int q;\
+    static RL_VLC_ELEM rl_vlc_table[32][static_size];\
+\
+    if(!rl.rl_vlc[0]){\
+        for(q=0; q<32; q++)\
+            rl.rl_vlc[q]= rl_vlc_table[q];\
+\
+        ff_rl_init_vlc(&rl, static_size);\
+    }\
+}
+
+static inline int get_rl_index(const RLTable *rl, int last, int run, int level)
+{
+    int index;
+    index = rl->index_run[last][run];
+    if (index >= rl->n)
+        return rl->n;
+    if (level > rl->max_level[last][run])
+        return rl->n;
+    return index + level - 1;
+}
+
+#endif /* AVCODEC_RL_H */