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/* |
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* Bytestream functions |
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* copyright (c) 2006 Baptiste Coudurier <baptiste.coudurier@free.fr> |
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* Copyright (c) 2012 Aneesh Dogra (lionaneesh) <lionaneesh@gmail.com> |
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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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#ifndef AVCODEC_BYTESTREAM_H |
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#define AVCODEC_BYTESTREAM_H |
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#include <stdint.h> |
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#include <string.h> |
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#include "libavutil/avassert.h" |
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#include "libavutil/common.h" |
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#include "libavutil/intreadwrite.h" |
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typedef struct GetByteContext { |
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const uint8_t *buffer, *buffer_end, *buffer_start; |
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} GetByteContext; |
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typedef struct PutByteContext { |
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uint8_t *buffer, *buffer_end, *buffer_start; |
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int eof; |
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} PutByteContext; |
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#define DEF(type, name, bytes, read, write) \ |
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static av_always_inline type bytestream_get_ ## name(const uint8_t **b) \ |
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{ \ |
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(*b) += bytes; \ |
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return read(*b - bytes); \ |
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} \ |
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static av_always_inline void bytestream_put_ ## name(uint8_t **b, \ |
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const type value) \ |
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{ \ |
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write(*b, value); \ |
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(*b) += bytes; \ |
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} \ |
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static av_always_inline void bytestream2_put_ ## name ## u(PutByteContext *p, \ |
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const type value) \ |
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{ \ |
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bytestream_put_ ## name(&p->buffer, value); \ |
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} \ |
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static av_always_inline void bytestream2_put_ ## name(PutByteContext *p, \ |
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const type value) \ |
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{ \ |
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if (!p->eof && (p->buffer_end - p->buffer >= bytes)) { \ |
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write(p->buffer, value); \ |
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p->buffer += bytes; \ |
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} else \ |
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p->eof = 1; \ |
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} \ |
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static av_always_inline type bytestream2_get_ ## name ## u(GetByteContext *g) \ |
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{ \ |
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return bytestream_get_ ## name(&g->buffer); \ |
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} \ |
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static av_always_inline type bytestream2_get_ ## name(GetByteContext *g) \ |
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{ \ |
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if (g->buffer_end - g->buffer < bytes) { \ |
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g->buffer = g->buffer_end; \ |
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return 0; \ |
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} \ |
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return bytestream2_get_ ## name ## u(g); \ |
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} \ |
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static av_always_inline type bytestream2_peek_ ## name ## u(GetByteContext *g) \ |
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{ \ |
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return read(g->buffer); \ |
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} \ |
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static av_always_inline type bytestream2_peek_ ## name(GetByteContext *g) \ |
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{ \ |
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if (g->buffer_end - g->buffer < bytes) \ |
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return 0; \ |
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return bytestream2_peek_ ## name ## u(g); \ |
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} |
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✓✓✓✗
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3049763 |
DEF(uint64_t, le64, 8, AV_RL64, AV_WL64) |
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✓✓✓✗
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32444649 |
DEF(unsigned int, le32, 4, AV_RL32, AV_WL32) |
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✓✓✓✗
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64450794 |
DEF(unsigned int, le24, 3, AV_RL24, AV_WL24) |
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✓✓✓✗
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231379543 |
DEF(unsigned int, le16, 2, AV_RL16, AV_WL16) |
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✗✓ |
1099375 |
DEF(uint64_t, be64, 8, AV_RB64, AV_WB64) |
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✓✓✓✗
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19495056 |
DEF(unsigned int, be32, 4, AV_RB32, AV_WB32) |
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✗✓✗✗
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3751666 |
DEF(unsigned int, be24, 3, AV_RB24, AV_WB24) |
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✓✓✓✗
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94311363 |
DEF(unsigned int, be16, 2, AV_RB16, AV_WB16) |
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✓✓✓✗
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327437226 |
DEF(unsigned int, byte, 1, AV_RB8 , AV_WB8) |
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#if AV_HAVE_BIGENDIAN |
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# define bytestream2_get_ne16 bytestream2_get_be16 |
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# define bytestream2_get_ne24 bytestream2_get_be24 |
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# define bytestream2_get_ne32 bytestream2_get_be32 |
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# define bytestream2_get_ne64 bytestream2_get_be64 |
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# define bytestream2_get_ne16u bytestream2_get_be16u |
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# define bytestream2_get_ne24u bytestream2_get_be24u |
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# define bytestream2_get_ne32u bytestream2_get_be32u |
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# define bytestream2_get_ne64u bytestream2_get_be64u |
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# define bytestream2_put_ne16 bytestream2_put_be16 |
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# define bytestream2_put_ne24 bytestream2_put_be24 |
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# define bytestream2_put_ne32 bytestream2_put_be32 |
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# define bytestream2_put_ne64 bytestream2_put_be64 |
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# define bytestream2_peek_ne16 bytestream2_peek_be16 |
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# define bytestream2_peek_ne24 bytestream2_peek_be24 |
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# define bytestream2_peek_ne32 bytestream2_peek_be32 |
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# define bytestream2_peek_ne64 bytestream2_peek_be64 |
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#else |
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# define bytestream2_get_ne16 bytestream2_get_le16 |
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# define bytestream2_get_ne24 bytestream2_get_le24 |
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# define bytestream2_get_ne32 bytestream2_get_le32 |
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# define bytestream2_get_ne64 bytestream2_get_le64 |
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# define bytestream2_get_ne16u bytestream2_get_le16u |
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# define bytestream2_get_ne24u bytestream2_get_le24u |
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# define bytestream2_get_ne32u bytestream2_get_le32u |
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# define bytestream2_get_ne64u bytestream2_get_le64u |
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# define bytestream2_put_ne16 bytestream2_put_le16 |
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# define bytestream2_put_ne24 bytestream2_put_le24 |
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# define bytestream2_put_ne32 bytestream2_put_le32 |
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# define bytestream2_put_ne64 bytestream2_put_le64 |
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# define bytestream2_peek_ne16 bytestream2_peek_le16 |
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# define bytestream2_peek_ne24 bytestream2_peek_le24 |
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# define bytestream2_peek_ne32 bytestream2_peek_le32 |
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# define bytestream2_peek_ne64 bytestream2_peek_le64 |
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#endif |
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static av_always_inline void bytestream2_init(GetByteContext *g, |
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const uint8_t *buf, |
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int buf_size) |
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{ |
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✗✓ |
182931 |
av_assert0(buf_size >= 0); |
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182931 |
g->buffer = buf; |
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182931 |
g->buffer_start = buf; |
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182931 |
g->buffer_end = buf + buf_size; |
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182931 |
} |
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static av_always_inline void bytestream2_init_writer(PutByteContext *p, |
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uint8_t *buf, |
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int buf_size) |
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{ |
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✗✓ |
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av_assert0(buf_size >= 0); |
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1928 |
p->buffer = buf; |
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1928 |
p->buffer_start = buf; |
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1928 |
p->buffer_end = buf + buf_size; |
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p->eof = 0; |
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} |
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21634022 |
static av_always_inline int bytestream2_get_bytes_left(GetByteContext *g) |
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{ |
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return g->buffer_end - g->buffer; |
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} |
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86094 |
static av_always_inline int bytestream2_get_bytes_left_p(PutByteContext *p) |
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{ |
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return p->buffer_end - p->buffer; |
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} |
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783487 |
static av_always_inline void bytestream2_skip(GetByteContext *g, |
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unsigned int size) |
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{ |
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✓✓ |
783487 |
g->buffer += FFMIN(g->buffer_end - g->buffer, size); |
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783487 |
} |
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70262 |
static av_always_inline void bytestream2_skipu(GetByteContext *g, |
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unsigned int size) |
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{ |
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70262 |
g->buffer += size; |
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70262 |
} |
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static av_always_inline void bytestream2_skip_p(PutByteContext *p, |
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unsigned int size) |
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{ |
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int size2; |
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✗✓ |
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if (p->eof) |
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return; |
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size2 = FFMIN(p->buffer_end - p->buffer, size); |
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✗✓ |
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if (size2 != size) |
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p->eof = 1; |
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p->buffer += size2; |
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} |
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4276149 |
static av_always_inline int bytestream2_tell(GetByteContext *g) |
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{ |
194 |
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4276149 |
return (int)(g->buffer - g->buffer_start); |
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} |
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197 |
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149596 |
static av_always_inline int bytestream2_tell_p(PutByteContext *p) |
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{ |
199 |
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149596 |
return (int)(p->buffer - p->buffer_start); |
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} |
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202 |
|
537 |
static av_always_inline int bytestream2_size(GetByteContext *g) |
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{ |
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return (int)(g->buffer_end - g->buffer_start); |
205 |
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} |
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207 |
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static av_always_inline int bytestream2_size_p(PutByteContext *p) |
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{ |
209 |
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return (int)(p->buffer_end - p->buffer_start); |
210 |
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} |
211 |
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212 |
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776602 |
static av_always_inline int bytestream2_seek(GetByteContext *g, |
213 |
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int offset, |
214 |
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int whence) |
215 |
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{ |
216 |
✓✓✓✗
|
776602 |
switch (whence) { |
217 |
|
1155 |
case SEEK_CUR: |
218 |
|
1155 |
offset = av_clip(offset, -(g->buffer - g->buffer_start), |
219 |
|
1155 |
g->buffer_end - g->buffer); |
220 |
|
1155 |
g->buffer += offset; |
221 |
|
1155 |
break; |
222 |
|
727 |
case SEEK_END: |
223 |
|
727 |
offset = av_clip(offset, -(g->buffer_end - g->buffer_start), 0); |
224 |
|
727 |
g->buffer = g->buffer_end + offset; |
225 |
|
727 |
break; |
226 |
|
774720 |
case SEEK_SET: |
227 |
|
774720 |
offset = av_clip(offset, 0, g->buffer_end - g->buffer_start); |
228 |
|
774720 |
g->buffer = g->buffer_start + offset; |
229 |
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774720 |
break; |
230 |
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default: |
231 |
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return AVERROR(EINVAL); |
232 |
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} |
233 |
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776602 |
return bytestream2_tell(g); |
234 |
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} |
235 |
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236 |
|
11594 |
static av_always_inline int bytestream2_seek_p(PutByteContext *p, |
237 |
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int offset, |
238 |
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int whence) |
239 |
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{ |
240 |
|
11594 |
p->eof = 0; |
241 |
✓✗✓✗
|
11594 |
switch (whence) { |
242 |
|
7050 |
case SEEK_CUR: |
243 |
✗✓ |
7050 |
if (p->buffer_end - p->buffer < offset) |
244 |
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p->eof = 1; |
245 |
|
7050 |
offset = av_clip(offset, -(p->buffer - p->buffer_start), |
246 |
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7050 |
p->buffer_end - p->buffer); |
247 |
|
7050 |
p->buffer += offset; |
248 |
|
7050 |
break; |
249 |
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case SEEK_END: |
250 |
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if (offset > 0) |
251 |
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p->eof = 1; |
252 |
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offset = av_clip(offset, -(p->buffer_end - p->buffer_start), 0); |
253 |
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p->buffer = p->buffer_end + offset; |
254 |
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break; |
255 |
|
4544 |
case SEEK_SET: |
256 |
✗✓ |
4544 |
if (p->buffer_end - p->buffer_start < offset) |
257 |
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p->eof = 1; |
258 |
|
4544 |
offset = av_clip(offset, 0, p->buffer_end - p->buffer_start); |
259 |
|
4544 |
p->buffer = p->buffer_start + offset; |
260 |
|
4544 |
break; |
261 |
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default: |
262 |
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return AVERROR(EINVAL); |
263 |
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} |
264 |
|
11594 |
return bytestream2_tell_p(p); |
265 |
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} |
266 |
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267 |
|
802220 |
static av_always_inline unsigned int bytestream2_get_buffer(GetByteContext *g, |
268 |
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uint8_t *dst, |
269 |
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unsigned int size) |
270 |
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{ |
271 |
|
802220 |
int size2 = FFMIN(g->buffer_end - g->buffer, size); |
272 |
|
802220 |
memcpy(dst, g->buffer, size2); |
273 |
|
802220 |
g->buffer += size2; |
274 |
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802220 |
return size2; |
275 |
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} |
276 |
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277 |
|
511650 |
static av_always_inline unsigned int bytestream2_get_bufferu(GetByteContext *g, |
278 |
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uint8_t *dst, |
279 |
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unsigned int size) |
280 |
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{ |
281 |
|
511650 |
memcpy(dst, g->buffer, size); |
282 |
|
511650 |
g->buffer += size; |
283 |
|
511650 |
return size; |
284 |
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} |
285 |
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|
286 |
|
2350 |
static av_always_inline unsigned int bytestream2_put_buffer(PutByteContext *p, |
287 |
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const uint8_t *src, |
288 |
|
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unsigned int size) |
289 |
|
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{ |
290 |
|
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int size2; |
291 |
✗✓ |
2350 |
if (p->eof) |
292 |
|
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return 0; |
293 |
|
2350 |
size2 = FFMIN(p->buffer_end - p->buffer, size); |
294 |
✗✓ |
2350 |
if (size2 != size) |
295 |
|
|
p->eof = 1; |
296 |
|
2350 |
memcpy(p->buffer, src, size2); |
297 |
|
2350 |
p->buffer += size2; |
298 |
|
2350 |
return size2; |
299 |
|
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} |
300 |
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|
301 |
|
1132 |
static av_always_inline unsigned int bytestream2_put_bufferu(PutByteContext *p, |
302 |
|
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const uint8_t *src, |
303 |
|
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unsigned int size) |
304 |
|
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{ |
305 |
|
1132 |
memcpy(p->buffer, src, size); |
306 |
|
1132 |
p->buffer += size; |
307 |
|
1132 |
return size; |
308 |
|
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} |
309 |
|
|
|
310 |
|
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static av_always_inline void bytestream2_set_buffer(PutByteContext *p, |
311 |
|
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const uint8_t c, |
312 |
|
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unsigned int size) |
313 |
|
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{ |
314 |
|
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int size2; |
315 |
|
|
if (p->eof) |
316 |
|
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return; |
317 |
|
|
size2 = FFMIN(p->buffer_end - p->buffer, size); |
318 |
|
|
if (size2 != size) |
319 |
|
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p->eof = 1; |
320 |
|
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memset(p->buffer, c, size2); |
321 |
|
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p->buffer += size2; |
322 |
|
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} |
323 |
|
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|
324 |
|
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static av_always_inline void bytestream2_set_bufferu(PutByteContext *p, |
325 |
|
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const uint8_t c, |
326 |
|
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unsigned int size) |
327 |
|
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{ |
328 |
|
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memset(p->buffer, c, size); |
329 |
|
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p->buffer += size; |
330 |
|
|
} |
331 |
|
|
|
332 |
|
4557 |
static av_always_inline unsigned int bytestream2_get_eof(PutByteContext *p) |
333 |
|
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{ |
334 |
|
4557 |
return p->eof; |
335 |
|
|
} |
336 |
|
|
|
337 |
|
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static av_always_inline unsigned int bytestream2_copy_bufferu(PutByteContext *p, |
338 |
|
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GetByteContext *g, |
339 |
|
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unsigned int size) |
340 |
|
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{ |
341 |
|
|
memcpy(p->buffer, g->buffer, size); |
342 |
|
|
p->buffer += size; |
343 |
|
|
g->buffer += size; |
344 |
|
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return size; |
345 |
|
|
} |
346 |
|
|
|
347 |
|
|
static av_always_inline unsigned int bytestream2_copy_buffer(PutByteContext *p, |
348 |
|
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GetByteContext *g, |
349 |
|
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unsigned int size) |
350 |
|
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{ |
351 |
|
|
int size2; |
352 |
|
|
|
353 |
|
|
if (p->eof) |
354 |
|
|
return 0; |
355 |
|
|
size = FFMIN(g->buffer_end - g->buffer, size); |
356 |
|
|
size2 = FFMIN(p->buffer_end - p->buffer, size); |
357 |
|
|
if (size2 != size) |
358 |
|
|
p->eof = 1; |
359 |
|
|
|
360 |
|
|
return bytestream2_copy_bufferu(p, g, size2); |
361 |
|
|
} |
362 |
|
|
|
363 |
|
1326 |
static av_always_inline unsigned int bytestream_get_buffer(const uint8_t **b, |
364 |
|
|
uint8_t *dst, |
365 |
|
|
unsigned int size) |
366 |
|
|
{ |
367 |
|
1326 |
memcpy(dst, *b, size); |
368 |
|
1326 |
(*b) += size; |
369 |
|
1326 |
return size; |
370 |
|
|
} |
371 |
|
|
|
372 |
|
2214797 |
static av_always_inline void bytestream_put_buffer(uint8_t **b, |
373 |
|
|
const uint8_t *src, |
374 |
|
|
unsigned int size) |
375 |
|
|
{ |
376 |
|
2214797 |
memcpy(*b, src, size); |
377 |
|
2214797 |
(*b) += size; |
378 |
|
2214797 |
} |
379 |
|
|
|
380 |
|
|
#endif /* AVCODEC_BYTESTREAM_H */ |