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72 lines
2.1 KiB
72 lines
2.1 KiB
/* |
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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 <stdint.h> |
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#include <string.h> |
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#include "config.h" |
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#include "libavutil/avassert.h" |
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#include "libavutil/intreadwrite.h" |
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#include "put_bits.h" |
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void ff_put_string(PutBitContext *pb, const char *string, int terminate_string) |
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{ |
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while (*string) { |
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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 ff_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 (CONFIG_SMALL || words < 16 || put_bits_count(pb) & 7) { |
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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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} else { |
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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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