297 lines
9.4 KiB
C
297 lines
9.4 KiB
C
/*
|
|
* Bytestream functions
|
|
* copyright (c) 2006 Baptiste Coudurier <baptiste.coudurier@free.fr>
|
|
* Copyright (c) 2012 Aneesh Dogra (lionaneesh) <lionaneesh@gmail.com>
|
|
*
|
|
* This file is part of Libav.
|
|
*
|
|
* Libav 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.
|
|
*
|
|
* Libav 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 Libav; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#ifndef AVCODEC_BYTESTREAM_H
|
|
#define AVCODEC_BYTESTREAM_H
|
|
|
|
#include <string.h>
|
|
#include "libavutil/common.h"
|
|
#include "libavutil/intreadwrite.h"
|
|
|
|
typedef struct {
|
|
const uint8_t *buffer, *buffer_end, *buffer_start;
|
|
} GetByteContext;
|
|
|
|
typedef struct {
|
|
uint8_t *buffer, *buffer_end, *buffer_start;
|
|
int eof;
|
|
} PutByteContext;
|
|
|
|
#define DEF_T(type, name, bytes, read, write) \
|
|
static av_always_inline type bytestream_get_ ## name(const uint8_t **b){\
|
|
(*b) += bytes;\
|
|
return read(*b - bytes);\
|
|
}\
|
|
static av_always_inline void bytestream_put_ ##name(uint8_t **b, const type value){\
|
|
write(*b, value);\
|
|
(*b) += bytes;\
|
|
}\
|
|
static av_always_inline void bytestream2_put_ ## name ## u(PutByteContext *p, const type value)\
|
|
{\
|
|
bytestream_put_ ## name(&p->buffer, value);\
|
|
}\
|
|
static av_always_inline void bytestream2_put_ ## name(PutByteContext *p, const type value){\
|
|
if (!p->eof && (p->buffer_end - p->buffer >= bytes)) {\
|
|
write(p->buffer, value);\
|
|
p->buffer += bytes;\
|
|
} else\
|
|
p->eof = 1;\
|
|
}\
|
|
static av_always_inline type bytestream2_get_ ## name ## u(GetByteContext *g)\
|
|
{\
|
|
return bytestream_get_ ## name(&g->buffer);\
|
|
}\
|
|
static av_always_inline type bytestream2_get_ ## name(GetByteContext *g)\
|
|
{\
|
|
if (g->buffer_end - g->buffer < bytes)\
|
|
return 0;\
|
|
return bytestream2_get_ ## name ## u(g);\
|
|
}\
|
|
static av_always_inline type bytestream2_peek_ ## name(GetByteContext *g)\
|
|
{\
|
|
if (g->buffer_end - g->buffer < bytes)\
|
|
return 0;\
|
|
return read(g->buffer);\
|
|
}
|
|
|
|
#define DEF(name, bytes, read, write) \
|
|
DEF_T(unsigned int, name, bytes, read, write)
|
|
#define DEF64(name, bytes, read, write) \
|
|
DEF_T(uint64_t, name, bytes, read, write)
|
|
|
|
DEF64(le64, 8, AV_RL64, AV_WL64)
|
|
DEF (le32, 4, AV_RL32, AV_WL32)
|
|
DEF (le24, 3, AV_RL24, AV_WL24)
|
|
DEF (le16, 2, AV_RL16, AV_WL16)
|
|
DEF64(be64, 8, AV_RB64, AV_WB64)
|
|
DEF (be32, 4, AV_RB32, AV_WB32)
|
|
DEF (be24, 3, AV_RB24, AV_WB24)
|
|
DEF (be16, 2, AV_RB16, AV_WB16)
|
|
DEF (byte, 1, AV_RB8 , AV_WB8 )
|
|
|
|
#undef DEF
|
|
#undef DEF64
|
|
#undef DEF_T
|
|
|
|
#if HAVE_BIGENDIAN
|
|
# define bytestream2_get_ne16 bytestream2_get_be16
|
|
# define bytestream2_get_ne24 bytestream2_get_be24
|
|
# define bytestream2_get_ne32 bytestream2_get_be32
|
|
# define bytestream2_get_ne64 bytestream2_get_be64
|
|
# define bytestream2_get_ne16u bytestream2_get_be16u
|
|
# define bytestream2_get_ne24u bytestream2_get_be24u
|
|
# define bytestream2_get_ne32u bytestream2_get_be32u
|
|
# define bytestream2_get_ne64u bytestream2_get_be64u
|
|
# define bytestream2_put_ne16 bytestream2_put_be16
|
|
# define bytestream2_put_ne24 bytestream2_put_be24
|
|
# define bytestream2_put_ne32 bytestream2_put_be32
|
|
# define bytestream2_put_ne64 bytestream2_put_be64
|
|
# define bytestream2_peek_ne16 bytestream2_peek_be16
|
|
# define bytestream2_peek_ne24 bytestream2_peek_be24
|
|
# define bytestream2_peek_ne32 bytestream2_peek_be32
|
|
# define bytestream2_peek_ne64 bytestream2_peek_be64
|
|
#else
|
|
# define bytestream2_get_ne16 bytestream2_get_le16
|
|
# define bytestream2_get_ne24 bytestream2_get_le24
|
|
# define bytestream2_get_ne32 bytestream2_get_le32
|
|
# define bytestream2_get_ne64 bytestream2_get_le64
|
|
# define bytestream2_get_ne16u bytestream2_get_le16u
|
|
# define bytestream2_get_ne24u bytestream2_get_le24u
|
|
# define bytestream2_get_ne32u bytestream2_get_le32u
|
|
# define bytestream2_get_ne64u bytestream2_get_le64u
|
|
# define bytestream2_put_ne16 bytestream2_put_le16
|
|
# define bytestream2_put_ne24 bytestream2_put_le24
|
|
# define bytestream2_put_ne32 bytestream2_put_le32
|
|
# define bytestream2_put_ne64 bytestream2_put_le64
|
|
# define bytestream2_peek_ne16 bytestream2_peek_le16
|
|
# define bytestream2_peek_ne24 bytestream2_peek_le24
|
|
# define bytestream2_peek_ne32 bytestream2_peek_le32
|
|
# define bytestream2_peek_ne64 bytestream2_peek_le64
|
|
#endif
|
|
|
|
static av_always_inline void bytestream2_init(GetByteContext *g,
|
|
const uint8_t *buf, int buf_size)
|
|
{
|
|
g->buffer = buf;
|
|
g->buffer_start = buf;
|
|
g->buffer_end = buf + buf_size;
|
|
}
|
|
|
|
static av_always_inline void bytestream2_init_writer(PutByteContext *p,
|
|
uint8_t *buf, int buf_size)
|
|
{
|
|
p->buffer = buf;
|
|
p->buffer_start = buf;
|
|
p->buffer_end = buf + buf_size;
|
|
p->eof = 0;
|
|
}
|
|
|
|
static av_always_inline unsigned int bytestream2_get_bytes_left(GetByteContext *g)
|
|
{
|
|
return g->buffer_end - g->buffer;
|
|
}
|
|
|
|
static av_always_inline unsigned int bytestream2_get_bytes_left_p(PutByteContext *p)
|
|
{
|
|
return p->buffer_end - p->buffer;
|
|
}
|
|
|
|
static av_always_inline void bytestream2_skip(GetByteContext *g,
|
|
unsigned int size)
|
|
{
|
|
g->buffer += FFMIN(g->buffer_end - g->buffer, size);
|
|
}
|
|
|
|
static av_always_inline void bytestream2_skip_p(PutByteContext *p,
|
|
unsigned int size)
|
|
{
|
|
int size2;
|
|
if (p->eof)
|
|
return;
|
|
size2 = FFMIN(p->buffer_end - p->buffer, size);
|
|
if (size2 != size)
|
|
p->eof = 1;
|
|
p->buffer += size2;
|
|
}
|
|
|
|
static av_always_inline int bytestream2_tell(GetByteContext *g)
|
|
{
|
|
return (int)(g->buffer - g->buffer_start);
|
|
}
|
|
|
|
static av_always_inline int bytestream2_tell_p(PutByteContext *p)
|
|
{
|
|
return (int)(p->buffer - p->buffer_start);
|
|
}
|
|
|
|
static av_always_inline int bytestream2_seek(GetByteContext *g, int offset,
|
|
int whence)
|
|
{
|
|
switch (whence) {
|
|
case SEEK_CUR:
|
|
offset = av_clip(offset, -(g->buffer - g->buffer_start),
|
|
g->buffer_end - g->buffer);
|
|
g->buffer += offset;
|
|
break;
|
|
case SEEK_END:
|
|
offset = av_clip(offset, -(g->buffer_end - g->buffer_start), 0);
|
|
g->buffer = g->buffer_end + offset;
|
|
break;
|
|
case SEEK_SET:
|
|
offset = av_clip(offset, 0, g->buffer_end - g->buffer_start);
|
|
g->buffer = g->buffer_start + offset;
|
|
break;
|
|
default:
|
|
return AVERROR(EINVAL);
|
|
}
|
|
return bytestream2_tell(g);
|
|
}
|
|
|
|
static av_always_inline int bytestream2_seek_p(PutByteContext *p, int offset,
|
|
int whence)
|
|
{
|
|
p->eof = 0;
|
|
switch (whence) {
|
|
case SEEK_CUR:
|
|
if (p->buffer_end - p->buffer < offset)
|
|
p->eof = 1;
|
|
offset = av_clip(offset, -(p->buffer - p->buffer_start),
|
|
p->buffer_end - p->buffer);
|
|
p->buffer += offset;
|
|
break;
|
|
case SEEK_END:
|
|
if (offset > 0)
|
|
p->eof = 1;
|
|
offset = av_clip(offset, -(p->buffer_end - p->buffer_start), 0);
|
|
p->buffer = p->buffer_end + offset;
|
|
break;
|
|
case SEEK_SET:
|
|
if (p->buffer_end - p->buffer_start < offset)
|
|
p->eof = 1;
|
|
offset = av_clip(offset, 0, p->buffer_end - p->buffer_start);
|
|
p->buffer = p->buffer_start + offset;
|
|
break;
|
|
default:
|
|
return AVERROR(EINVAL);
|
|
}
|
|
return bytestream2_tell_p(p);
|
|
}
|
|
|
|
static av_always_inline unsigned int bytestream2_get_buffer(GetByteContext *g,
|
|
uint8_t *dst,
|
|
unsigned int size)
|
|
{
|
|
int size2 = FFMIN(g->buffer_end - g->buffer, size);
|
|
memcpy(dst, g->buffer, size2);
|
|
g->buffer += size2;
|
|
return size2;
|
|
}
|
|
|
|
static av_always_inline unsigned int bytestream2_put_buffer(PutByteContext *p,
|
|
const uint8_t *src,
|
|
unsigned int size)
|
|
{
|
|
int size2;
|
|
if (p->eof)
|
|
return 0;
|
|
size2 = FFMIN(p->buffer_end - p->buffer, size);
|
|
if (size2 != size)
|
|
p->eof = 1;
|
|
memcpy(p->buffer, src, size2);
|
|
p->buffer += size2;
|
|
return size2;
|
|
}
|
|
|
|
static av_always_inline void bytestream2_set_buffer(PutByteContext *p,
|
|
const uint8_t c,
|
|
unsigned int size)
|
|
{
|
|
int size2;
|
|
if (p->eof)
|
|
return;
|
|
size2 = FFMIN(p->buffer_end - p->buffer, size);
|
|
if (size2 != size)
|
|
p->eof = 1;
|
|
memset(p->buffer, c, size2);
|
|
p->buffer += size2;
|
|
}
|
|
|
|
static av_always_inline unsigned int bytestream2_get_eof(PutByteContext *p)
|
|
{
|
|
return p->eof;
|
|
}
|
|
|
|
static av_always_inline unsigned int bytestream_get_buffer(const uint8_t **b, uint8_t *dst, unsigned int size)
|
|
{
|
|
memcpy(dst, *b, size);
|
|
(*b) += size;
|
|
return size;
|
|
}
|
|
|
|
static av_always_inline void bytestream_put_buffer(uint8_t **b, const uint8_t *src, unsigned int size)
|
|
{
|
|
memcpy(*b, src, size);
|
|
(*b) += size;
|
|
}
|
|
|
|
#endif /* AVCODEC_BYTESTREAM_H */
|