summaryrefslogtreecommitdiffstats
path: root/media/ffvpx/libavutil/integer.c
diff options
context:
space:
mode:
authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 19:33:14 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 19:33:14 +0000
commit36d22d82aa202bb199967e9512281e9a53db42c9 (patch)
tree105e8c98ddea1c1e4784a60a5a6410fa416be2de /media/ffvpx/libavutil/integer.c
parentInitial commit. (diff)
downloadfirefox-esr-upstream.tar.xz
firefox-esr-upstream.zip
Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r--media/ffvpx/libavutil/integer.c166
1 files changed, 166 insertions, 0 deletions
diff --git a/media/ffvpx/libavutil/integer.c b/media/ffvpx/libavutil/integer.c
new file mode 100644
index 0000000000..ae87c467b2
--- /dev/null
+++ b/media/ffvpx/libavutil/integer.c
@@ -0,0 +1,166 @@
+/*
+ * arbitrary precision integers
+ * Copyright (c) 2004 Michael Niedermayer <michaelni@gmx.at>
+ *
+ * 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
+ * arbitrary precision integers
+ * @author Michael Niedermayer <michaelni@gmx.at>
+ */
+
+#include <string.h>
+
+#include "integer.h"
+#include "avassert.h"
+#include "intmath.h"
+
+static const AVInteger zero_i;
+
+AVInteger av_add_i(AVInteger a, AVInteger b){
+ int i, carry=0;
+
+ for(i=0; i<AV_INTEGER_SIZE; i++){
+ carry= (carry>>16) + a.v[i] + b.v[i];
+ a.v[i]= carry;
+ }
+ return a;
+}
+
+AVInteger av_sub_i(AVInteger a, AVInteger b){
+ int i, carry=0;
+
+ for(i=0; i<AV_INTEGER_SIZE; i++){
+ carry= (carry>>16) + a.v[i] - b.v[i];
+ a.v[i]= carry;
+ }
+ return a;
+}
+
+int av_log2_i(AVInteger a){
+ int i;
+
+ for(i=AV_INTEGER_SIZE-1; i>=0; i--){
+ if(a.v[i])
+ return av_log2_16bit(a.v[i]) + 16*i;
+ }
+ return -1;
+}
+
+AVInteger av_mul_i(AVInteger a, AVInteger b){
+ AVInteger out;
+ int i, j;
+ int na= (av_log2_i(a)+16) >> 4;
+ int nb= (av_log2_i(b)+16) >> 4;
+
+ memset(&out, 0, sizeof(out));
+
+ for(i=0; i<na; i++){
+ unsigned int carry=0;
+
+ if(a.v[i])
+ for(j=i; j<AV_INTEGER_SIZE && j-i<=nb; j++){
+ carry= (carry>>16) + out.v[j] + a.v[i]*(unsigned)b.v[j-i];
+ out.v[j]= carry;
+ }
+ }
+
+ return out;
+}
+
+int av_cmp_i(AVInteger a, AVInteger b){
+ int i;
+ int v= (int16_t)a.v[AV_INTEGER_SIZE-1] - (int16_t)b.v[AV_INTEGER_SIZE-1];
+ if(v) return (v>>16)|1;
+
+ for(i=AV_INTEGER_SIZE-2; i>=0; i--){
+ int v= a.v[i] - b.v[i];
+ if(v) return (v>>16)|1;
+ }
+ return 0;
+}
+
+AVInteger av_shr_i(AVInteger a, int s){
+ AVInteger out;
+ int i;
+
+ for(i=0; i<AV_INTEGER_SIZE; i++){
+ unsigned int index= i + (s>>4);
+ unsigned int v=0;
+ if (index + 1 < AV_INTEGER_SIZE) v = a.v[index + 1] * (1U << 16);
+ if (index < AV_INTEGER_SIZE) v |= a.v[index];
+ out.v[i]= v >> (s&15);
+ }
+ return out;
+}
+
+AVInteger av_mod_i(AVInteger *quot, AVInteger a, AVInteger b){
+ int i= av_log2_i(a) - av_log2_i(b);
+ AVInteger quot_temp;
+ if(!quot) quot = &quot_temp;
+
+ if ((int16_t)a.v[AV_INTEGER_SIZE-1] < 0) {
+ a = av_mod_i(quot, av_sub_i(zero_i, a), b);
+ *quot = av_sub_i(zero_i, *quot);
+ return av_sub_i(zero_i, a);
+ }
+
+ av_assert2((int16_t)a.v[AV_INTEGER_SIZE-1] >= 0 && (int16_t)b.v[AV_INTEGER_SIZE-1] >= 0);
+ av_assert2(av_log2_i(b)>=0);
+
+ if(i > 0)
+ b= av_shr_i(b, -i);
+
+ memset(quot, 0, sizeof(AVInteger));
+
+ while(i-- >= 0){
+ *quot= av_shr_i(*quot, -1);
+ if(av_cmp_i(a, b) >= 0){
+ a= av_sub_i(a, b);
+ quot->v[0] += 1;
+ }
+ b= av_shr_i(b, 1);
+ }
+ return a;
+}
+
+AVInteger av_div_i(AVInteger a, AVInteger b){
+ AVInteger quot;
+ av_mod_i(&quot, a, b);
+ return quot;
+}
+
+AVInteger av_int2i(int64_t a){
+ AVInteger out;
+ int i;
+
+ for(i=0; i<AV_INTEGER_SIZE; i++){
+ out.v[i]= a;
+ a>>=16;
+ }
+ return out;
+}
+
+int64_t av_i2int(AVInteger a){
+ uint64_t out = a.v[3];
+
+ for (int i = 2; i >= 0; i--)
+ out = (out << 16) | a.v[i];
+ return out;
+}