FFmpeg
idctdsp_init_armv6.c
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1 /*
2  * Copyright (c) 2009 Mans Rullgard <mans@mansr.com>
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 #include <stdint.h>
22 
23 #include "libavutil/attributes.h"
24 #include "libavcodec/avcodec.h"
25 #include "libavcodec/idctdsp.h"
26 #include "idct.h"
27 #include "idctdsp_arm.h"
28 
29 void ff_add_pixels_clamped_armv6(const int16_t *block, uint8_t *pixels,
30  ptrdiff_t line_size);
31 
33  unsigned high_bit_depth)
34 {
35  if (!avctx->lowres && !high_bit_depth) {
36  if ((avctx->idct_algo == FF_IDCT_AUTO && !(avctx->flags & AV_CODEC_FLAG_BITEXACT)) ||
37  avctx->idct_algo == FF_IDCT_SIMPLEARMV6) {
38  c->idct_put = ff_simple_idct_put_armv6;
39  c->idct_add = ff_simple_idct_add_armv6;
40  c->idct = ff_simple_idct_armv6;
41  c->perm_type = FF_IDCT_PERM_LIBMPEG2;
42  }
43  }
44  c->add_pixels_clamped = ff_add_pixels_clamped_armv6;
45 }
FF_IDCT_AUTO
#define FF_IDCT_AUTO
Definition: avcodec.h:1504
AVCodecContext::flags
int flags
AV_CODEC_FLAG_*.
Definition: avcodec.h:581
ff_simple_idct_armv6
void ff_simple_idct_armv6(int16_t *data)
idctdsp_arm.h
av_cold
#define av_cold
Definition: attributes.h:90
ff_simple_idct_put_armv6
void ff_simple_idct_put_armv6(uint8_t *dest, ptrdiff_t line_size, int16_t *data)
idct.h
c
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
Definition: undefined.txt:32
AVCodecContext::lowres
int lowres
low resolution decoding, 1-> 1/2 size, 2->1/4 size
Definition: avcodec.h:1538
FF_IDCT_SIMPLEARMV6
#define FF_IDCT_SIMPLEARMV6
Definition: avcodec.h:1513
attributes.h
AVCodecContext::idct_algo
int idct_algo
IDCT algorithm, see FF_IDCT_* below.
Definition: avcodec.h:1503
idctdsp.h
avcodec.h
ff_idctdsp_init_armv6
av_cold void ff_idctdsp_init_armv6(IDCTDSPContext *c, AVCodecContext *avctx, unsigned high_bit_depth)
Definition: idctdsp_init_armv6.c:32
IDCTDSPContext
Definition: idctdsp.h:53
AVCodecContext
main external API structure.
Definition: avcodec.h:501
AV_CODEC_FLAG_BITEXACT
#define AV_CODEC_FLAG_BITEXACT
Use only bitexact stuff (except (I)DCT).
Definition: avcodec.h:310
ff_simple_idct_add_armv6
void ff_simple_idct_add_armv6(uint8_t *dest, ptrdiff_t line_size, int16_t *data)
block
The exact code depends on how similar the blocks are and how related they are to the block
Definition: filter_design.txt:207
ff_add_pixels_clamped_armv6
void ff_add_pixels_clamped_armv6(const int16_t *block, uint8_t *pixels, ptrdiff_t line_size)
FF_IDCT_PERM_LIBMPEG2
@ FF_IDCT_PERM_LIBMPEG2
Definition: idctdsp.h:39