summaryrefslogtreecommitdiffstats
path: root/media/ffvpx/libavcodec/golomb.h
diff options
context:
space:
mode:
Diffstat (limited to 'media/ffvpx/libavcodec/golomb.h')
-rw-r--r--media/ffvpx/libavcodec/golomb.h616
1 files changed, 616 insertions, 0 deletions
diff --git a/media/ffvpx/libavcodec/golomb.h b/media/ffvpx/libavcodec/golomb.h
new file mode 100644
index 0000000000..164c2583b6
--- /dev/null
+++ b/media/ffvpx/libavcodec/golomb.h
@@ -0,0 +1,616 @@
+/*
+ * exp golomb vlc stuff
+ * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
+ * Copyright (c) 2004 Alex Beregszaszi
+ *
+ * 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
+ * @brief
+ * exp golomb vlc stuff
+ * @author Michael Niedermayer <michaelni@gmx.at> and Alex Beregszaszi
+ */
+
+#ifndef AVCODEC_GOLOMB_H
+#define AVCODEC_GOLOMB_H
+
+#include <stdint.h>
+
+#include "get_bits.h"
+
+#define INVALID_VLC 0x80000000
+
+extern const uint8_t ff_golomb_vlc_len[512];
+extern const uint8_t ff_ue_golomb_vlc_code[512];
+extern const int8_t ff_se_golomb_vlc_code[512];
+
+extern const uint8_t ff_interleaved_golomb_vlc_len[256];
+extern const uint8_t ff_interleaved_ue_golomb_vlc_code[256];
+extern const int8_t ff_interleaved_se_golomb_vlc_code[256];
+extern const uint8_t ff_interleaved_dirac_golomb_vlc_code[256];
+
+/**
+ * Read an unsigned Exp-Golomb code in the range 0 to 8190.
+ *
+ * @returns the read value or a negative error code.
+ */
+static inline int get_ue_golomb(GetBitContext *gb)
+{
+ unsigned int buf;
+
+#if CACHED_BITSTREAM_READER
+ buf = show_bits_long(gb, 32);
+
+ if (buf >= (1 << 27)) {
+ buf >>= 32 - 9;
+ skip_bits_long(gb, ff_golomb_vlc_len[buf]);
+
+ return ff_ue_golomb_vlc_code[buf];
+ } else {
+ int log = 2 * av_log2(buf) - 31;
+
+ skip_bits_long(gb, 32 - log);
+ if (log < 7)
+ return AVERROR_INVALIDDATA;
+ buf >>= log;
+ buf--;
+
+ return buf;
+ }
+#else
+ OPEN_READER(re, gb);
+ UPDATE_CACHE(re, gb);
+ buf = GET_CACHE(re, gb);
+
+ if (buf >= (1 << 27)) {
+ buf >>= 32 - 9;
+ LAST_SKIP_BITS(re, gb, ff_golomb_vlc_len[buf]);
+ CLOSE_READER(re, gb);
+
+ return ff_ue_golomb_vlc_code[buf];
+ } else {
+ int log = 2 * av_log2(buf) - 31;
+ LAST_SKIP_BITS(re, gb, 32 - log);
+ CLOSE_READER(re, gb);
+ if (log < 7)
+ return AVERROR_INVALIDDATA;
+ buf >>= log;
+ buf--;
+
+ return buf;
+ }
+#endif
+}
+
+/**
+ * Read an unsigned Exp-Golomb code in the range 0 to UINT32_MAX-1.
+ */
+static inline unsigned get_ue_golomb_long(GetBitContext *gb)
+{
+ unsigned buf, log;
+
+ buf = show_bits_long(gb, 32);
+ log = 31 - av_log2(buf);
+ skip_bits_long(gb, log);
+
+ return get_bits_long(gb, log + 1) - 1;
+}
+
+/**
+ * read unsigned exp golomb code, constraint to a max of 31.
+ * If the value encountered is not in 0..31, the return value
+ * is outside the range 0..30.
+ */
+static inline int get_ue_golomb_31(GetBitContext *gb)
+{
+ unsigned int buf;
+
+#if CACHED_BITSTREAM_READER
+ buf = show_bits_long(gb, 32);
+
+ buf >>= 32 - 9;
+ skip_bits_long(gb, ff_golomb_vlc_len[buf]);
+#else
+
+ OPEN_READER(re, gb);
+ UPDATE_CACHE(re, gb);
+ buf = GET_CACHE(re, gb);
+
+ buf >>= 32 - 9;
+ LAST_SKIP_BITS(re, gb, ff_golomb_vlc_len[buf]);
+ CLOSE_READER(re, gb);
+#endif
+
+ return ff_ue_golomb_vlc_code[buf];
+}
+
+static inline unsigned get_interleaved_ue_golomb(GetBitContext *gb)
+{
+ uint32_t buf;
+
+#if CACHED_BITSTREAM_READER
+ buf = show_bits_long(gb, 32);
+
+ if (buf & 0xAA800000) {
+ buf >>= 32 - 8;
+ skip_bits_long(gb, ff_interleaved_golomb_vlc_len[buf]);
+
+ return ff_interleaved_ue_golomb_vlc_code[buf];
+ } else {
+ unsigned ret = 1;
+
+ do {
+ buf >>= 32 - 8;
+ skip_bits_long(gb, FFMIN(ff_interleaved_golomb_vlc_len[buf], 8));
+
+ if (ff_interleaved_golomb_vlc_len[buf] != 9) {
+ ret <<= (ff_interleaved_golomb_vlc_len[buf] - 1) >> 1;
+ ret |= ff_interleaved_dirac_golomb_vlc_code[buf];
+ break;
+ }
+ ret = (ret << 4) | ff_interleaved_dirac_golomb_vlc_code[buf];
+ buf = show_bits_long(gb, 32);
+ } while (get_bits_left(gb) > 0);
+
+ return ret - 1;
+ }
+#else
+ OPEN_READER(re, gb);
+ UPDATE_CACHE(re, gb);
+ buf = GET_CACHE(re, gb);
+
+ if (buf & 0xAA800000) {
+ buf >>= 32 - 8;
+ LAST_SKIP_BITS(re, gb, ff_interleaved_golomb_vlc_len[buf]);
+ CLOSE_READER(re, gb);
+
+ return ff_interleaved_ue_golomb_vlc_code[buf];
+ } else {
+ unsigned ret = 1;
+
+ do {
+ buf >>= 32 - 8;
+ LAST_SKIP_BITS(re, gb,
+ FFMIN(ff_interleaved_golomb_vlc_len[buf], 8));
+
+ if (ff_interleaved_golomb_vlc_len[buf] != 9) {
+ ret <<= (ff_interleaved_golomb_vlc_len[buf] - 1) >> 1;
+ ret |= ff_interleaved_dirac_golomb_vlc_code[buf];
+ break;
+ }
+ ret = (ret << 4) | ff_interleaved_dirac_golomb_vlc_code[buf];
+ UPDATE_CACHE(re, gb);
+ buf = GET_CACHE(re, gb);
+ } while (ret<0x8000000U && BITS_AVAILABLE(re, gb));
+
+ CLOSE_READER(re, gb);
+ return ret - 1;
+ }
+#endif
+}
+
+/**
+ * read unsigned truncated exp golomb code.
+ */
+static inline int get_te0_golomb(GetBitContext *gb, int range)
+{
+ av_assert2(range >= 1);
+
+ if (range == 1)
+ return 0;
+ else if (range == 2)
+ return get_bits1(gb) ^ 1;
+ else
+ return get_ue_golomb(gb);
+}
+
+/**
+ * read unsigned truncated exp golomb code.
+ */
+static inline int get_te_golomb(GetBitContext *gb, int range)
+{
+ av_assert2(range >= 1);
+
+ if (range == 2)
+ return get_bits1(gb) ^ 1;
+ else
+ return get_ue_golomb(gb);
+}
+
+/**
+ * read signed exp golomb code.
+ */
+static inline int get_se_golomb(GetBitContext *gb)
+{
+ unsigned int buf;
+
+#if CACHED_BITSTREAM_READER
+ buf = show_bits_long(gb, 32);
+
+ if (buf >= (1 << 27)) {
+ buf >>= 32 - 9;
+ skip_bits_long(gb, ff_golomb_vlc_len[buf]);
+
+ return ff_se_golomb_vlc_code[buf];
+ } else {
+ int log = 2 * av_log2(buf) - 31;
+ buf >>= log;
+
+ skip_bits_long(gb, 32 - log);
+
+ if (buf & 1)
+ buf = -(buf >> 1);
+ else
+ buf = (buf >> 1);
+
+ return buf;
+ }
+#else
+ OPEN_READER(re, gb);
+ UPDATE_CACHE(re, gb);
+ buf = GET_CACHE(re, gb);
+
+ if (buf >= (1 << 27)) {
+ buf >>= 32 - 9;
+ LAST_SKIP_BITS(re, gb, ff_golomb_vlc_len[buf]);
+ CLOSE_READER(re, gb);
+
+ return ff_se_golomb_vlc_code[buf];
+ } else {
+ int log = av_log2(buf), sign;
+ LAST_SKIP_BITS(re, gb, 31 - log);
+ UPDATE_CACHE(re, gb);
+ buf = GET_CACHE(re, gb);
+
+ buf >>= log;
+
+ LAST_SKIP_BITS(re, gb, 32 - log);
+ CLOSE_READER(re, gb);
+
+ sign = -(buf & 1);
+ buf = ((buf >> 1) ^ sign) - sign;
+
+ return buf;
+ }
+#endif
+}
+
+static inline int get_se_golomb_long(GetBitContext *gb)
+{
+ unsigned int buf = get_ue_golomb_long(gb);
+ int sign = (buf & 1) - 1;
+ return ((buf >> 1) ^ sign) + 1;
+}
+
+static inline int get_interleaved_se_golomb(GetBitContext *gb)
+{
+ unsigned int buf;
+
+#if CACHED_BITSTREAM_READER
+ buf = show_bits_long(gb, 32);
+
+ if (buf & 0xAA800000) {
+ buf >>= 32 - 8;
+ skip_bits_long(gb, ff_interleaved_golomb_vlc_len[buf]);
+
+ return ff_interleaved_se_golomb_vlc_code[buf];
+ } else {
+ int log;
+ skip_bits(gb, 8);
+ buf |= 1 | show_bits(gb, 24);
+
+ if ((buf & 0xAAAAAAAA) == 0)
+ return INVALID_VLC;
+
+ for (log = 31; (buf & 0x80000000) == 0; log--)
+ buf = (buf << 2) - ((buf << log) >> (log - 1)) + (buf >> 30);
+
+ skip_bits_long(gb, 63 - 2 * log - 8);
+
+ return (signed) (((((buf << log) >> log) - 1) ^ -(buf & 0x1)) + 1) >> 1;
+ }
+#else
+ OPEN_READER(re, gb);
+ UPDATE_CACHE(re, gb);
+ buf = GET_CACHE(re, gb);
+
+ if (buf & 0xAA800000) {
+ buf >>= 32 - 8;
+ LAST_SKIP_BITS(re, gb, ff_interleaved_golomb_vlc_len[buf]);
+ CLOSE_READER(re, gb);
+
+ return ff_interleaved_se_golomb_vlc_code[buf];
+ } else {
+ int log;
+ LAST_SKIP_BITS(re, gb, 8);
+ UPDATE_CACHE(re, gb);
+ buf |= 1 | (GET_CACHE(re, gb) >> 8);
+
+ if ((buf & 0xAAAAAAAA) == 0)
+ return INVALID_VLC;
+
+ for (log = 31; (buf & 0x80000000) == 0; log--)
+ buf = (buf << 2) - ((buf << log) >> (log - 1)) + (buf >> 30);
+
+ LAST_SKIP_BITS(re, gb, 63 - 2 * log - 8);
+ CLOSE_READER(re, gb);
+
+ return (signed) (((((buf << log) >> log) - 1) ^ -(buf & 0x1)) + 1) >> 1;
+ }
+#endif
+}
+
+static inline int dirac_get_se_golomb(GetBitContext *gb)
+{
+ uint32_t ret = get_interleaved_ue_golomb(gb);
+
+ if (ret) {
+ int sign = -get_bits1(gb);
+ ret = (ret ^ sign) - sign;
+ }
+
+ return ret;
+}
+
+/**
+ * read unsigned golomb rice code (ffv1).
+ */
+static inline int get_ur_golomb(GetBitContext *gb, int k, int limit,
+ int esc_len)
+{
+ unsigned int buf;
+ int log;
+
+#if CACHED_BITSTREAM_READER
+ buf = show_bits_long(gb, 32);
+
+ log = av_log2(buf);
+
+ if (log > 31 - limit) {
+ buf >>= log - k;
+ buf += (30 - log) << k;
+ skip_bits_long(gb, 32 + k - log);
+
+ return buf;
+ } else {
+ skip_bits_long(gb, limit);
+ buf = get_bits_long(gb, esc_len);
+
+ return buf + limit - 1;
+ }
+#else
+ OPEN_READER(re, gb);
+ UPDATE_CACHE(re, gb);
+ buf = GET_CACHE(re, gb);
+
+ log = av_log2(buf);
+
+ if (log > 31 - limit) {
+ buf >>= log - k;
+ buf += (30U - log) << k;
+ LAST_SKIP_BITS(re, gb, 32 + k - log);
+ CLOSE_READER(re, gb);
+
+ return buf;
+ } else {
+ LAST_SKIP_BITS(re, gb, limit);
+ UPDATE_CACHE(re, gb);
+
+ buf = SHOW_UBITS(re, gb, esc_len);
+
+ LAST_SKIP_BITS(re, gb, esc_len);
+ CLOSE_READER(re, gb);
+
+ return buf + limit - 1;
+ }
+#endif
+}
+
+/**
+ * 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;
+
+#if CACHED_BITSTREAM_READER
+ buf = show_bits_long(gb, 32);
+
+ log = av_log2(buf);
+
+ if (log - k >= 1 && 32 - log < limit) {
+ buf >>= log - k;
+ buf += (30 - log) << k;
+ skip_bits_long(gb, 32 + k - log);
+
+ return buf;
+ } else {
+ int i;
+ for (i = 0;
+ i < limit && get_bits1(gb) == 0 && get_bits_left(gb) > 0;
+ i++);
+
+ if (i < limit - 1) {
+ buf = get_bits_long(gb, k);
+
+ return buf + (i << k);
+ } else if (i == limit - 1) {
+ buf = get_bits_long(gb, esc_len);
+
+ return buf + 1;
+ } else
+ return -1;
+ }
+#else
+ OPEN_READER(re, gb);
+ UPDATE_CACHE(re, gb);
+ buf = GET_CACHE(re, gb);
+
+ log = av_log2(buf);
+
+ av_assert2(k <= 31);
+
+ if (log - k >= 32 - MIN_CACHE_BITS + (MIN_CACHE_BITS == 32) &&
+ 32 - log < limit) {
+ buf >>= log - k;
+ buf += (30U - log) << k;
+ LAST_SKIP_BITS(re, gb, 32 + k - log);
+ CLOSE_READER(re, gb);
+
+ return buf;
+ } else {
+ int i;
+ for (i = 0; i + MIN_CACHE_BITS <= limit && SHOW_UBITS(re, gb, MIN_CACHE_BITS) == 0; i += MIN_CACHE_BITS) {
+ if (gb->size_in_bits <= re_index) {
+ CLOSE_READER(re, gb);
+ return -1;
+ }
+ LAST_SKIP_BITS(re, gb, MIN_CACHE_BITS);
+ UPDATE_CACHE(re, gb);
+ }
+ for (; i < limit && SHOW_UBITS(re, gb, 1) == 0; i++) {
+ SKIP_BITS(re, gb, 1);
+ }
+ LAST_SKIP_BITS(re, gb, 1);
+ UPDATE_CACHE(re, gb);
+
+ if (i < limit - 1) {
+ if (k) {
+ if (k > MIN_CACHE_BITS - 1) {
+ buf = SHOW_UBITS(re, gb, 16) << (k-16);
+ LAST_SKIP_BITS(re, gb, 16);
+ UPDATE_CACHE(re, gb);
+ buf |= SHOW_UBITS(re, gb, k-16);
+ LAST_SKIP_BITS(re, gb, k-16);
+ } else {
+ buf = SHOW_UBITS(re, gb, k);
+ LAST_SKIP_BITS(re, gb, k);
+ }
+ } else {
+ buf = 0;
+ }
+
+ buf += ((SUINT)i << k);
+ } else if (i == limit - 1) {
+ buf = SHOW_UBITS(re, gb, esc_len);
+ LAST_SKIP_BITS(re, gb, esc_len);
+
+ buf ++;
+ } else {
+ buf = -1;
+ }
+ CLOSE_READER(re, gb);
+ return buf;
+ }
+#endif
+}
+
+/**
+ * read signed golomb rice code (ffv1).
+ */
+static inline int get_sr_golomb(GetBitContext *gb, int k, int limit,
+ int esc_len)
+{
+ unsigned v = get_ur_golomb(gb, k, limit, esc_len);
+ return (v >> 1) ^ -(v & 1);
+}
+
+/**
+ * read signed golomb rice code (flac).
+ */
+static inline int get_sr_golomb_flac(GetBitContext *gb, int k, int limit,
+ int esc_len)
+{
+ unsigned v = get_ur_golomb_jpegls(gb, k, limit, esc_len);
+ return (v >> 1) ^ -(v & 1);
+}
+
+/**
+ * read unsigned golomb rice code (shorten).
+ */
+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);
+ return (uvar >> 1) ^ -(uvar & 1);
+}
+
+#ifdef TRACE
+
+static inline int get_ue(GetBitContext *s, const char *file, const char *func,
+ int line)
+{
+ int show = show_bits(s, 24);
+ int pos = get_bits_count(s);
+ int i = get_ue_golomb(s);
+ int len = get_bits_count(s) - pos;
+ int bits = show >> (24 - len);
+
+ av_log(NULL, AV_LOG_DEBUG, "%5d %2d %3d ue @%5d in %s %s:%d\n",
+ bits, len, i, pos, file, func, line);
+
+ return i;
+}
+
+static inline int get_se(GetBitContext *s, const char *file, const char *func,
+ int line)
+{
+ int show = show_bits(s, 24);
+ int pos = get_bits_count(s);
+ int i = get_se_golomb(s);
+ int len = get_bits_count(s) - pos;
+ int bits = show >> (24 - len);
+
+ av_log(NULL, AV_LOG_DEBUG, "%5d %2d %3d se @%5d in %s %s:%d\n",
+ bits, len, i, pos, file, func, line);
+
+ return i;
+}
+
+static inline int get_te(GetBitContext *s, int r, char *file, const char *func,
+ int line)
+{
+ int show = show_bits(s, 24);
+ int pos = get_bits_count(s);
+ int i = get_te0_golomb(s, r);
+ int len = get_bits_count(s) - pos;
+ int bits = show >> (24 - len);
+
+ av_log(NULL, AV_LOG_DEBUG, "%5d %2d %3d te @%5d in %s %s:%d\n",
+ bits, len, i, pos, file, func, line);
+
+ return i;
+}
+
+#define get_ue_golomb(a) get_ue(a, __FILE__, __func__, __LINE__)
+#define get_se_golomb(a) get_se(a, __FILE__, __func__, __LINE__)
+#define get_te_golomb(a, r) get_te(a, r, __FILE__, __func__, __LINE__)
+#define get_te0_golomb(a, r) get_te(a, r, __FILE__, __func__, __LINE__)
+
+#endif /* TRACE */
+#endif /* AVCODEC_GOLOMB_H */
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-06 13:51:07 +0000