From 26a029d407be480d791972afb5975cf62c9360a6 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Fri, 19 Apr 2024 02:47:55 +0200 Subject: Adding upstream version 124.0.1. Signed-off-by: Daniel Baumann --- media/ffvpx/libavcodec/bitstream.c | 72 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 72 insertions(+) create mode 100644 media/ffvpx/libavcodec/bitstream.c (limited to 'media/ffvpx/libavcodec/bitstream.c') diff --git a/media/ffvpx/libavcodec/bitstream.c b/media/ffvpx/libavcodec/bitstream.c new file mode 100644 index 0000000000..3606575055 --- /dev/null +++ b/media/ffvpx/libavcodec/bitstream.c @@ -0,0 +1,72 @@ +/* + * Common bit i/o utils + * Copyright (c) 2000, 2001 Fabrice Bellard + * Copyright (c) 2002-2004 Michael Niedermayer + * Copyright (c) 2010 Loren Merritt + * + * alternative bitstream reader & writer by 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 + * bitstream api. + */ + +#include +#include + +#include "config.h" +#include "libavutil/avassert.h" +#include "libavutil/intreadwrite.h" +#include "put_bits.h" + +void ff_put_string(PutBitContext *pb, const char *string, int terminate_string) +{ + while (*string) { + put_bits(pb, 8, *string); + string++; + } + if (terminate_string) + put_bits(pb, 8, 0); +} + +void ff_copy_bits(PutBitContext *pb, const uint8_t *src, int length) +{ + int words = length >> 4; + int bits = length & 15; + int i; + + if (length == 0) + return; + + av_assert0(length <= put_bits_left(pb)); + + if (CONFIG_SMALL || words < 16 || put_bits_count(pb) & 7) { + for (i = 0; i < words; i++) + put_bits(pb, 16, AV_RB16(src + 2 * i)); + } else { + for (i = 0; put_bits_count(pb) & 31; i++) + put_bits(pb, 8, src[i]); + flush_put_bits(pb); + memcpy(put_bits_ptr(pb), src + i, 2 * words - i); + skip_put_bytes(pb, 2 * words - i); + } + + put_bits(pb, bits, AV_RB16(src + 2 * words) >> (16 - bits)); +} -- cgit v1.2.3