mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-28 20:53:54 +02:00
ddc6adaa28
* commit '4d55e9de27894ddfb337b28cd7aa6d14a12666d2': vc1: Split bits used in libavformat into a separate header Conflicts: libavformat/movenc.c Merged-by: Michael Niedermayer <michaelni@gmx.at>
93 lines
2.4 KiB
C
93 lines
2.4 KiB
C
/*
|
|
* VC-1 and WMV3 decoder
|
|
* Copyright (c) 2006-2007 Konstantin Shishkov
|
|
* Partly based on vc9.c (c) 2005 Anonymous, Alex Beregszaszi, 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
|
|
*/
|
|
|
|
#ifndef AVCODEC_VC1_COMMON_H
|
|
#define AVCODEC_VC1_COMMON_H
|
|
|
|
#include <stdint.h>
|
|
|
|
#include "libavutil/attributes.h"
|
|
|
|
/** Markers used in VC-1 AP frame data */
|
|
//@{
|
|
enum VC1Code {
|
|
VC1_CODE_RES0 = 0x00000100,
|
|
VC1_CODE_ENDOFSEQ = 0x0000010A,
|
|
VC1_CODE_SLICE,
|
|
VC1_CODE_FIELD,
|
|
VC1_CODE_FRAME,
|
|
VC1_CODE_ENTRYPOINT,
|
|
VC1_CODE_SEQHDR,
|
|
};
|
|
//@}
|
|
|
|
#define IS_MARKER(x) (((x) & ~0xFF) == VC1_CODE_RES0)
|
|
|
|
/** Available Profiles */
|
|
//@{
|
|
enum Profile {
|
|
PROFILE_SIMPLE,
|
|
PROFILE_MAIN,
|
|
PROFILE_COMPLEX, ///< TODO: WMV9 specific
|
|
PROFILE_ADVANCED
|
|
};
|
|
//@}
|
|
|
|
/** Find VC-1 marker in buffer
|
|
* @return position where next marker starts or end of buffer if no marker found
|
|
*/
|
|
static av_always_inline const uint8_t* find_next_marker(const uint8_t *src, const uint8_t *end)
|
|
{
|
|
uint32_t mrk = 0xFFFFFFFF;
|
|
|
|
if (end-src < 4)
|
|
return end;
|
|
while (src < end) {
|
|
mrk = (mrk << 8) | *src++;
|
|
if (IS_MARKER(mrk))
|
|
return src - 4;
|
|
}
|
|
return end;
|
|
}
|
|
|
|
static av_always_inline int vc1_unescape_buffer(const uint8_t *src, int size, uint8_t *dst)
|
|
{
|
|
int dsize = 0, i;
|
|
|
|
if (size < 4) {
|
|
for (dsize = 0; dsize < size; dsize++)
|
|
*dst++ = *src++;
|
|
return size;
|
|
}
|
|
for (i = 0; i < size; i++, src++) {
|
|
if (src[0] == 3 && i >= 2 && !src[-1] && !src[-2] && i < size-1 && src[1] < 4) {
|
|
dst[dsize++] = src[1];
|
|
src++;
|
|
i++;
|
|
} else
|
|
dst[dsize++] = *src;
|
|
}
|
|
return dsize;
|
|
}
|
|
|
|
#endif /* AVCODEC_VC1_COMMON_H */
|