FFmpeg
xvididct_init.c
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1 /*
2  * This file is part of FFmpeg.
3  *
4  * FFmpeg is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU Lesser General Public
6  * License as published by the Free Software Foundation; either
7  * version 2.1 of the License, or (at your option) any later version.
8  *
9  * FFmpeg is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12  * Lesser General Public License for more details.
13  *
14  * You should have received a copy of the GNU Lesser General Public
15  * License along with FFmpeg; if not, write to the Free Software
16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17  */
18 
19 #include "config.h"
20 #include "libavutil/attributes.h"
21 #include "libavutil/cpu.h"
22 #include "libavutil/x86/cpu.h"
23 #include "libavcodec/idctdsp.h"
24 #include "libavcodec/xvididct.h"
25 
26 #include "idctdsp.h"
27 #include "xvididct.h"
28 
29 #if ARCH_X86_32 && HAVE_X86ASM
30 static void xvid_idct_mmx_put(uint8_t *dest, ptrdiff_t line_size, short *block)
31 {
32  ff_xvid_idct_mmx(block);
33  ff_put_pixels_clamped_mmx(block, dest, line_size);
34 }
35 
36 static void xvid_idct_mmx_add(uint8_t *dest, ptrdiff_t line_size, short *block)
37 {
38  ff_xvid_idct_mmx(block);
39  ff_add_pixels_clamped_mmx(block, dest, line_size);
40 }
41 
42 static void xvid_idct_mmxext_put(uint8_t *dest, ptrdiff_t line_size, short *block)
43 {
44  ff_xvid_idct_mmxext(block);
45  ff_put_pixels_clamped_mmx(block, dest, line_size);
46 }
47 
48 static void xvid_idct_mmxext_add(uint8_t *dest, ptrdiff_t line_size, short *block)
49 {
50  ff_xvid_idct_mmxext(block);
51  ff_add_pixels_clamped_mmx(block, dest, line_size);
52 }
53 #endif
54 
56  unsigned high_bit_depth)
57 {
58 #if HAVE_X86ASM
60 
61  if (high_bit_depth ||
62  !(avctx->idct_algo == FF_IDCT_AUTO ||
63  avctx->idct_algo == FF_IDCT_XVID))
64  return;
65 
66 #if ARCH_X86_32
67  if (EXTERNAL_MMX(cpu_flags)) {
68  c->idct_put = xvid_idct_mmx_put;
69  c->idct_add = xvid_idct_mmx_add;
72  }
73 
74  if (EXTERNAL_MMXEXT(cpu_flags)) {
75  c->idct_put = xvid_idct_mmxext_put;
76  c->idct_add = xvid_idct_mmxext_add;
79  }
80 #endif
81 
82  if (EXTERNAL_SSE2(cpu_flags)) {
87  }
88 #endif /* HAVE_X86ASM */
89 }
#define EXTERNAL_MMX(flags)
Definition: cpu.h:56
void ff_add_pixels_clamped_mmx(const int16_t *block, uint8_t *pixels, ptrdiff_t line_size)
void ff_xvid_idct_add_sse2(uint8_t *dest, ptrdiff_t line_size, short *block)
static atomic_int cpu_flags
Definition: cpu.c:50
Macro definitions for various function/variable attributes.
The exact code depends on how similar the blocks are and how related they are to the block
uint8_t
#define av_cold
Definition: attributes.h:82
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
#define EXTERNAL_SSE2(flags)
Definition: cpu.h:59
#define FF_IDCT_AUTO
Definition: avcodec.h:2772
#define FF_IDCT_XVID
Definition: avcodec.h:2779
void ff_xvid_idct_mmxext(short *block)
int idct_algo
IDCT algorithm, see FF_IDCT_* below.
Definition: avcodec.h:2771
void ff_xvid_idct_mmx(short *block)
void(* idct_add)(uint8_t *dest, ptrdiff_t line_size, int16_t *block)
block -> idct -> add dest -> clip to unsigned 8 bit -> dest.
Definition: idctdsp.h:79
av_cold void ff_xvid_idct_init_x86(IDCTDSPContext *c, AVCodecContext *avctx, unsigned high_bit_depth)
Definition: xvididct_init.c:55
void(* idct_put)(uint8_t *dest, ptrdiff_t line_size, int16_t *block)
block -> idct -> clip to unsigned 8 bit -> dest.
Definition: idctdsp.h:72
main external API structure.
Definition: avcodec.h:1568
void ff_xvid_idct_put_sse2(uint8_t *dest, ptrdiff_t line_size, short *block)
void ff_xvid_idct_sse2(short *block)
int av_get_cpu_flags(void)
Return the flags which specify extensions supported by the CPU.
Definition: cpu.c:93
#define EXTERNAL_MMXEXT(flags)
Definition: cpu.h:57
void ff_put_pixels_clamped_mmx(const int16_t *block, uint8_t *pixels, ptrdiff_t line_size)
void(* idct)(int16_t *block)
Definition: idctdsp.h:65
header for Xvid IDCT functions
enum idct_permutation_type perm_type
Definition: idctdsp.h:97