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b347384173
The usage of a static variable presents a potential for data races and
means that this function can't be used in init functions of codecs with
FF_CODEC_CAP_INIT_THREADSAFE (unless of course one presumes that
everything is alright in which case the error is not triggered; but then
the whole function is pointless...). This makes the Snow decoder
init-threadsafe as it already claims.
Notice that this function has been removed in 2014 by Libav in commit
9103185bd1, because only some codepaths
are checked this way and because it only affects legacy compilers. The
latter is of course even more true today.
Reviewed-by: Anton Khirnov <anton@khirnov.net>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
94 lines
3.2 KiB
C
94 lines
3.2 KiB
C
/*
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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_ME_CMP_H
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#define AVCODEC_ME_CMP_H
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#include <stdint.h>
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#include "avcodec.h"
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extern const uint32_t ff_square_tab[512];
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/* minimum alignment rules ;)
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* If you notice errors in the align stuff, need more alignment for some ASM code
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* for some CPU or need to use a function with less aligned data then send a mail
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* to the ffmpeg-devel mailing list, ...
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*
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* !warning These alignments might not match reality, (missing attribute((align))
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* stuff somewhere possible).
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* I (Michael) did not check them, these are just the alignments which I think
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* could be reached easily ...
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*
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* !future video codecs might need functions with less strict alignment
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*/
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struct MpegEncContext;
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/* Motion estimation:
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* h is limited to { width / 2, width, 2 * width },
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* but never larger than 16 and never smaller than 2.
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* Although currently h < 4 is not used as functions with
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* width < 8 are neither used nor implemented. */
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typedef int (*me_cmp_func)(struct MpegEncContext *c,
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uint8_t *blk1 /* align width (8 or 16) */,
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uint8_t *blk2 /* align 1 */, ptrdiff_t stride,
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int h);
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typedef struct MECmpContext {
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int (*sum_abs_dctelem)(int16_t *block /* align 16 */);
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me_cmp_func sad[6]; /* identical to pix_absAxA except additional void * */
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me_cmp_func sse[6];
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me_cmp_func hadamard8_diff[6];
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me_cmp_func dct_sad[6];
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me_cmp_func quant_psnr[6];
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me_cmp_func bit[6];
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me_cmp_func rd[6];
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me_cmp_func vsad[6];
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me_cmp_func vsse[6];
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me_cmp_func nsse[6];
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me_cmp_func w53[6];
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me_cmp_func w97[6];
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me_cmp_func dct_max[6];
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me_cmp_func dct264_sad[6];
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me_cmp_func me_pre_cmp[6];
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me_cmp_func me_cmp[6];
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me_cmp_func me_sub_cmp[6];
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me_cmp_func mb_cmp[6];
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me_cmp_func ildct_cmp[6]; // only width 16 used
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me_cmp_func frame_skip_cmp[6]; // only width 8 used
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me_cmp_func pix_abs[2][4];
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me_cmp_func median_sad[6];
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} MECmpContext;
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void ff_me_cmp_init(MECmpContext *c, AVCodecContext *avctx);
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void ff_me_cmp_init_alpha(MECmpContext *c, AVCodecContext *avctx);
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void ff_me_cmp_init_arm(MECmpContext *c, AVCodecContext *avctx);
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void ff_me_cmp_init_ppc(MECmpContext *c, AVCodecContext *avctx);
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void ff_me_cmp_init_x86(MECmpContext *c, AVCodecContext *avctx);
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void ff_me_cmp_init_mips(MECmpContext *c, AVCodecContext *avctx);
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void ff_set_cmp(MECmpContext *c, me_cmp_func *cmp, int type);
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void ff_dsputil_init_dwt(MECmpContext *c);
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#endif /* AVCODEC_ME_CMP_H */
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