29d147c94d
* commit '059a934806':
lavc: Consistently prefix input buffer defines
Conflicts:
doc/examples/decoding_encoding.c
libavcodec/4xm.c
libavcodec/aac_adtstoasc_bsf.c
libavcodec/aacdec.c
libavcodec/aacenc.c
libavcodec/ac3dec.h
libavcodec/asvenc.c
libavcodec/avcodec.h
libavcodec/avpacket.c
libavcodec/dvdec.c
libavcodec/ffv1enc.c
libavcodec/g2meet.c
libavcodec/gif.c
libavcodec/h264.c
libavcodec/h264_mp4toannexb_bsf.c
libavcodec/huffyuvdec.c
libavcodec/huffyuvenc.c
libavcodec/jpeglsenc.c
libavcodec/libxvid.c
libavcodec/mdec.c
libavcodec/motionpixels.c
libavcodec/mpeg4videodec.c
libavcodec/mpegvideo.c
libavcodec/noise_bsf.c
libavcodec/nuv.c
libavcodec/nvenc.c
libavcodec/options.c
libavcodec/parser.c
libavcodec/pngenc.c
libavcodec/proresenc_kostya.c
libavcodec/qsvdec.c
libavcodec/svq1enc.c
libavcodec/tiffenc.c
libavcodec/truemotion2.c
libavcodec/utils.c
libavcodec/utvideoenc.c
libavcodec/vc1dec.c
libavcodec/wmalosslessdec.c
libavformat/adxdec.c
libavformat/aiffdec.c
libavformat/apc.c
libavformat/apetag.c
libavformat/avidec.c
libavformat/bink.c
libavformat/cafdec.c
libavformat/flvdec.c
libavformat/id3v2.c
libavformat/isom.c
libavformat/matroskadec.c
libavformat/mov.c
libavformat/mpc.c
libavformat/mpc8.c
libavformat/mpegts.c
libavformat/mvi.c
libavformat/mxfdec.c
libavformat/mxg.c
libavformat/nutdec.c
libavformat/oggdec.c
libavformat/oggparsecelt.c
libavformat/oggparseflac.c
libavformat/oggparseopus.c
libavformat/oggparsespeex.c
libavformat/omadec.c
libavformat/rawdec.c
libavformat/riffdec.c
libavformat/rl2.c
libavformat/rmdec.c
libavformat/rtpdec_latm.c
libavformat/rtpdec_mpeg4.c
libavformat/rtpdec_qdm2.c
libavformat/rtpdec_svq3.c
libavformat/sierravmd.c
libavformat/smacker.c
libavformat/smush.c
libavformat/spdifenc.c
libavformat/takdec.c
libavformat/tta.c
libavformat/utils.c
libavformat/vqf.c
libavformat/westwood_vqa.c
libavformat/xmv.c
libavformat/xwma.c
libavformat/yop.c
Merged-by: Michael Niedermayer <michael@niedermayer.cc>
57 lines
1.8 KiB
C
57 lines
1.8 KiB
C
/*
|
|
* Copyright (c) 2003-2010 Michael Niedermayer <michaelni@gmx.at>
|
|
*
|
|
* 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
|
|
*/
|
|
|
|
/**
|
|
* @file
|
|
* Accelerated start code search function for start codes common to
|
|
* MPEG-1/2/4 video, VC-1, H.264/5
|
|
* @author Michael Niedermayer <michaelni@gmx.at>
|
|
*/
|
|
|
|
#include "startcode.h"
|
|
#include "config.h"
|
|
|
|
int ff_startcode_find_candidate_c(const uint8_t *buf, int size)
|
|
{
|
|
int i = 0;
|
|
#if HAVE_FAST_UNALIGNED
|
|
/* we check i < size instead of i + 3 / 7 because it is
|
|
* simpler and there must be AV_INPUT_BUFFER_PADDING_SIZE
|
|
* bytes at the end.
|
|
*/
|
|
#if HAVE_FAST_64BIT
|
|
while (i < size &&
|
|
!((~*(const uint64_t *)(buf + i) &
|
|
(*(const uint64_t *)(buf + i) - 0x0101010101010101ULL)) &
|
|
0x8080808080808080ULL))
|
|
i += 8;
|
|
#else
|
|
while (i < size &&
|
|
!((~*(const uint32_t *)(buf + i) &
|
|
(*(const uint32_t *)(buf + i) - 0x01010101U)) &
|
|
0x80808080U))
|
|
i += 4;
|
|
#endif
|
|
#endif
|
|
for (; i < size; i++)
|
|
if (!buf[i])
|
|
break;
|
|
return i;
|
|
}
|