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+/*
+ * 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;
+
+/**
+ * Initialize max_level and index_run from table_run and table_level;
+ * this is equivalent to initializing RLTable.max_level[0] and
+ * RLTable.index_run[0] with ff_rl_init().
+ */
+void ff_rl_init_level_run(uint8_t max_level[MAX_LEVEL + 1],
+ uint8_t index_run[MAX_RUN + 1],
+ const uint8_t table_run[/* n */],
+ const uint8_t table_level[/* n*/], int n);
+
+/**
+ * Initialize index_run, max_level and max_run from n, last, table_vlc,
+ * table_run and table_level.
+ * @param static_store static uint8_t array[2][2*MAX_RUN + MAX_LEVEL + 3]
+ * to hold the level and run tables.
+ * @note This function does not touch rl_vlc at all, hence there is no need
+ * to synchronize calls to ff_rl_init() and ff_rl_init_vlc() using the
+ * same RLTable.
+ */
+void ff_rl_init(RLTable *rl, uint8_t static_store[2][2*MAX_RUN + MAX_LEVEL + 3]);
+
+/**
+ * Initialize rl_vlc from n, last, table_vlc, table_run and table_level.
+ * All rl_vlc pointers to be initialized must already point to a static
+ * buffer of `static_size` RL_VLC_ELEM elements; if a pointer is NULL,
+ * initializing further VLCs stops.
+ * @note This function does not touch what ff_rl_init() initializes at all,
+ * hence there is no need to synchronize calls to ff_rl_init() and
+ * ff_rl_init_vlc() using the same RLTable.
+ */
+void ff_rl_init_vlc(RLTable *rl, unsigned static_size);
+
+#define VLC_INIT_RL(rl, static_size)\
+{\
+ static RL_VLC_ELEM rl_vlc_table[32][static_size];\
+\
+ for (int q = 0; q < 32; q++) \
+ rl.rl_vlc[q] = rl_vlc_table[q]; \
+\
+ ff_rl_init_vlc(&rl, static_size); \
+}
+
+#define INIT_FIRST_VLC_RL(rl, static_size) \
+do { \
+ static RL_VLC_ELEM rl_vlc_table[static_size]; \
+ \
+ rl.rl_vlc[0] = rl_vlc_table; \
+ ff_rl_init_vlc(&rl, static_size); \
+} while (0)
+
+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 */