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-rw-r--r--media/ffvpx/libavcodec/vlc.h144
1 files changed, 144 insertions, 0 deletions
diff --git a/media/ffvpx/libavcodec/vlc.h b/media/ffvpx/libavcodec/vlc.h
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+++ b/media/ffvpx/libavcodec/vlc.h
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+/*
+ * 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
+ */
+
+#ifndef AVCODEC_VLC_H
+#define AVCODEC_VLC_H
+
+#include <stdint.h>
+
+// When changing this, be sure to also update tableprint_vlc.h accordingly.
+typedef int16_t VLCBaseType;
+
+typedef struct VLCElem {
+ VLCBaseType sym, len;
+} VLCElem;
+
+typedef struct VLC {
+ int bits;
+ VLCElem *table;
+ int table_size, table_allocated;
+} VLC;
+
+typedef struct RL_VLC_ELEM {
+ int16_t level;
+ int8_t len;
+ uint8_t run;
+} RL_VLC_ELEM;
+
+#define init_vlc(vlc, nb_bits, nb_codes, \
+ bits, bits_wrap, bits_size, \
+ codes, codes_wrap, codes_size, \
+ flags) \
+ ff_init_vlc_sparse(vlc, nb_bits, nb_codes, \
+ bits, bits_wrap, bits_size, \
+ codes, codes_wrap, codes_size, \
+ NULL, 0, 0, flags)
+
+int ff_init_vlc_sparse(VLC *vlc, int nb_bits, int nb_codes,
+ const void *bits, int bits_wrap, int bits_size,
+ const void *codes, int codes_wrap, int codes_size,
+ const void *symbols, int symbols_wrap, int symbols_size,
+ int flags);
+
+/**
+ * Build VLC decoding tables suitable for use with get_vlc2()
+ *
+ * This function takes lengths and symbols and calculates the codes from them.
+ * For this the input lengths and symbols have to be sorted according to "left
+ * nodes in the corresponding tree first".
+ *
+ * @param[in,out] vlc The VLC to be initialized; table and table_allocated
+ * must have been set when initializing a static VLC,
+ * otherwise this will be treated as uninitialized.
+ * @param[in] nb_bits The number of bits to use for the VLC table;
+ * higher values take up more memory and cache, but
+ * allow to read codes with fewer reads.
+ * @param[in] nb_codes The number of provided length and (if supplied) symbol
+ * entries.
+ * @param[in] lens The lengths of the codes. Entries > 0 correspond to
+ * valid codes; entries == 0 will be skipped and entries
+ * with len < 0 indicate that the tree is incomplete and
+ * has an open end of length -len at this position.
+ * @param[in] lens_wrap Stride (in bytes) of the lengths.
+ * @param[in] symbols The symbols, i.e. what is returned from get_vlc2()
+ * when the corresponding code is encountered.
+ * May be NULL, then 0, 1, 2, 3, 4,... will be used.
+ * @param[in] symbols_wrap Stride (in bytes) of the symbols.
+ * @param[in] symbols_size Size of the symbols. 1 and 2 are supported.
+ * @param[in] offset An offset to apply to all the valid symbols.
+ * @param[in] flags A combination of the INIT_VLC_* flags; notice that
+ * INIT_VLC_INPUT_LE is pointless and ignored.
+ */
+int ff_init_vlc_from_lengths(VLC *vlc, int nb_bits, int nb_codes,
+ const int8_t *lens, int lens_wrap,
+ const void *symbols, int symbols_wrap, int symbols_size,
+ int offset, int flags, void *logctx);
+
+void ff_free_vlc(VLC *vlc);
+
+/* If INIT_VLC_INPUT_LE is set, the LSB bit of the codes used to
+ * initialize the VLC table is the first bit to be read. */
+#define INIT_VLC_INPUT_LE 2
+/* If set the VLC is intended for a little endian bitstream reader. */
+#define INIT_VLC_OUTPUT_LE 8
+#define INIT_VLC_LE (INIT_VLC_INPUT_LE | INIT_VLC_OUTPUT_LE)
+#define INIT_VLC_USE_NEW_STATIC 4
+#define INIT_VLC_STATIC_OVERLONG (1 | INIT_VLC_USE_NEW_STATIC)
+
+#define INIT_CUSTOM_VLC_SPARSE_STATIC(vlc, bits, a, b, c, d, e, f, g, \
+ h, i, j, flags, static_size) \
+ do { \
+ static VLCElem table[static_size]; \
+ (vlc)->table = table; \
+ (vlc)->table_allocated = static_size; \
+ ff_init_vlc_sparse(vlc, bits, a, b, c, d, e, f, g, h, i, j, \
+ flags | INIT_VLC_USE_NEW_STATIC); \
+ } while (0)
+
+#define INIT_VLC_SPARSE_STATIC(vlc, bits, a, b, c, d, e, f, g, h, i, j, static_size) \
+ INIT_CUSTOM_VLC_SPARSE_STATIC(vlc, bits, a, b, c, d, e, f, g, \
+ h, i, j, 0, static_size)
+
+#define INIT_LE_VLC_SPARSE_STATIC(vlc, bits, a, b, c, d, e, f, g, h, i, j, static_size) \
+ INIT_CUSTOM_VLC_SPARSE_STATIC(vlc, bits, a, b, c, d, e, f, g, \
+ h, i, j, INIT_VLC_LE, static_size)
+
+#define INIT_CUSTOM_VLC_STATIC(vlc, bits, a, b, c, d, e, f, g, flags, static_size) \
+ INIT_CUSTOM_VLC_SPARSE_STATIC(vlc, bits, a, b, c, d, e, f, g, \
+ NULL, 0, 0, flags, static_size)
+
+#define INIT_VLC_STATIC(vlc, bits, a, b, c, d, e, f, g, static_size) \
+ INIT_VLC_SPARSE_STATIC(vlc, bits, a, b, c, d, e, f, g, NULL, 0, 0, static_size)
+
+#define INIT_LE_VLC_STATIC(vlc, bits, a, b, c, d, e, f, g, static_size) \
+ INIT_LE_VLC_SPARSE_STATIC(vlc, bits, a, b, c, d, e, f, g, NULL, 0, 0, static_size)
+
+#define INIT_VLC_STATIC_FROM_LENGTHS(vlc, bits, nb_codes, lens, len_wrap, \
+ symbols, symbols_wrap, symbols_size, \
+ offset, flags, static_size) \
+ do { \
+ static VLCElem table[static_size]; \
+ (vlc)->table = table; \
+ (vlc)->table_allocated = static_size; \
+ ff_init_vlc_from_lengths(vlc, bits, nb_codes, lens, len_wrap, \
+ symbols, symbols_wrap, symbols_size, \
+ offset, flags | INIT_VLC_USE_NEW_STATIC, \
+ NULL); \
+ } while (0)
+
+#endif /* AVCODEC_VLC_H */