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https://github.com/tuxbox-neutrino/libstb-hal.git
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79 lines
1.9 KiB
C
79 lines
1.9 KiB
C
/*
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* Common bit i/o utils
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* Copyright (c) 2000, 2001 Fabrice Bellard
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* Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
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* Copyright (c) 2010 Loren Merritt
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*
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* alternative bitstream reader & writer by Michael Niedermayer <michaelni@gmx.at>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* bitstream api.
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*/
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#include <libavutil/avassert.h>
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#include <ffmpeg/put_bits.h>
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void avpriv_align_put_bits(PutBitContext *s)
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{
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put_bits(s, s->bit_left & 7, 0);
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}
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void avpriv_put_string(PutBitContext *pb, const char *string, int terminate_string)
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{
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while (*string)
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{
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put_bits(pb, 8, *string);
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string++;
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}
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if (terminate_string)
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put_bits(pb, 8, 0);
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}
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void avpriv_copy_bits(PutBitContext *pb, const uint8_t *src, int length)
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{
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int words = length >> 4;
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int bits = length & 15;
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int i;
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if (length == 0)
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return;
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av_assert0(length <= put_bits_left(pb));
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if (words < 16 || put_bits_count(pb) & 7)
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{
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for (i = 0; i < words; i++)
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put_bits(pb, 16, AV_RB16(src + 2 * i));
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}
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else
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{
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for (i = 0; put_bits_count(pb) & 31; i++)
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put_bits(pb, 8, src[i]);
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flush_put_bits(pb);
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memcpy(put_bits_ptr(pb), src + i, 2 * words - i);
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skip_put_bytes(pb, 2 * words - i);
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}
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put_bits(pb, bits, AV_RB16(src + 2 * words) >> (16 - bits));
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}
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