FFmpeg  4.3.7
sw_scale.c
Go to the documentation of this file.
1 /*
2  *
3  * This file is part of FFmpeg.
4  *
5  * FFmpeg is free software; you can redistribute it and/or modify
6  * it under the terms of the GNU General Public License as published by
7  * the Free Software Foundation; either version 2 of the License, or
8  * (at your option) any later version.
9  *
10  * FFmpeg is distributed in the hope that it will be useful,
11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13  * GNU General Public License for more details.
14  *
15  * You should have received a copy of the GNU General Public License along
16  * with FFmpeg; if not, write to the Free Software Foundation, Inc.,
17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
18  */
19 
20 #include <string.h>
21 
22 #include "libavutil/common.h"
23 #include "libavutil/intreadwrite.h"
24 #include "libavutil/mem.h"
25 
26 #include "libswscale/swscale.h"
28 
29 #include "checkasm.h"
30 
31 #define randomize_buffers(buf, size) \
32  do { \
33  int j; \
34  for (j = 0; j < size; j+=4) \
35  AV_WN32(buf + j, rnd()); \
36  } while (0)
37 
38 #define SRC_PIXELS 128
39 
40 static void check_hscale(void)
41 {
42 #define MAX_FILTER_WIDTH 40
43 #define FILTER_SIZES 5
44  static const int filter_sizes[FILTER_SIZES] = { 4, 8, 16, 32, 40 };
45 
46 #define HSCALE_PAIRS 2
47  static const int hscale_pairs[HSCALE_PAIRS][2] = {
48  { 8, 14 },
49  { 8, 18 },
50  };
51 
52  int i, j, fsi, hpi, width;
53  struct SwsContext *ctx;
54 
55  // padded
57  LOCAL_ALIGNED_32(uint32_t, dst0, [SRC_PIXELS]);
58  LOCAL_ALIGNED_32(uint32_t, dst1, [SRC_PIXELS]);
59 
60  // padded
62  LOCAL_ALIGNED_32(int32_t, filterPos, [SRC_PIXELS]);
63 
64  // The dst parameter here is either int16_t or int32_t but we use void* to
65  // just cover both cases.
66  declare_func_emms(AV_CPU_FLAG_MMX, void, void *c, void *dst, int dstW,
67  const uint8_t *src, const int16_t *filter,
68  const int32_t *filterPos, int filterSize);
69 
70  ctx = sws_alloc_context();
71  if (sws_init_context(ctx, NULL, NULL) < 0)
72  fail();
73 
75 
76  for (hpi = 0; hpi < HSCALE_PAIRS; hpi++) {
77  for (fsi = 0; fsi < FILTER_SIZES; fsi++) {
78  width = filter_sizes[fsi];
79 
80  ctx->srcBpc = hscale_pairs[hpi][0];
81  ctx->dstBpc = hscale_pairs[hpi][1];
82  ctx->hLumFilterSize = ctx->hChrFilterSize = width;
83 
84  for (i = 0; i < SRC_PIXELS; i++) {
85  filterPos[i] = i;
86 
87  // These filter cofficients are chosen to try break two corner
88  // cases, namely:
89  //
90  // - Negative filter coefficients. The filters output signed
91  // values, and it should be possible to end up with negative
92  // output values.
93  //
94  // - Positive clipping. The hscale filter function has clipping
95  // at (1<<15) - 1
96  //
97  // The coefficients sum to the 1.0 point for the hscale
98  // functions (1 << 14).
99 
100  for (j = 0; j < width; j++) {
101  filter[i * width + j] = -((1 << 14) / (width - 1));
102  }
103  filter[i * width + (rnd() % width)] = ((1 << 15) - 1);
104  }
105 
106  for (i = 0; i < MAX_FILTER_WIDTH; i++) {
107  // These values should be unused in SIMD implementations but
108  // may still be read, random coefficients here should help show
109  // issues where they are used in error.
110 
111  filter[SRC_PIXELS * width + i] = rnd();
112  }
113  ff_getSwsFunc(ctx);
114 
115  if (check_func(ctx->hcScale, "hscale_%d_to_%d_width%d", ctx->srcBpc, ctx->dstBpc + 1, width)) {
116  memset(dst0, 0, SRC_PIXELS * sizeof(dst0[0]));
117  memset(dst1, 0, SRC_PIXELS * sizeof(dst1[0]));
118 
119  call_ref(NULL, dst0, SRC_PIXELS, src, filter, filterPos, width);
120  call_new(NULL, dst1, SRC_PIXELS, src, filter, filterPos, width);
121  if (memcmp(dst0, dst1, SRC_PIXELS * sizeof(dst0[0])))
122  fail();
123  bench_new(NULL, dst0, SRC_PIXELS, src, filter, filterPos, width);
124  }
125  }
126  }
127  sws_freeContext(ctx);
128 }
129 
131 {
132  check_hscale();
133  report("hscale");
134 }
#define NULL
Definition: coverity.c:32
void checkasm_check_sw_scale(void)
Definition: sw_scale.c:130
void(* hcScale)(struct SwsContext *c, int16_t *dst, int dstW, const uint8_t *src, const int16_t *filter, const int32_t *filterPos, int filterSize)
#define HSCALE_PAIRS
static void check_hscale(void)
Definition: sw_scale.c:40
Memory handling functions.
#define report
Definition: checkasm.h:126
static void filter(int16_t *output, ptrdiff_t out_stride, int16_t *low, ptrdiff_t low_stride, int16_t *high, ptrdiff_t high_stride, int len, int clip)
Definition: cfhd.c:196
uint8_t
av_warn_unused_result int sws_init_context(struct SwsContext *sws_context, SwsFilter *srcFilter, SwsFilter *dstFilter)
Initialize the swscaler context sws_context.
Definition: utils.c:1170
external API header
#define FFALIGN(x, a)
Definition: macros.h:48
#define src
Definition: vp8dsp.c:254
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:269
int hLumFilterSize
Horizontal filter size for luma/alpha pixels.
SwsFunc ff_getSwsFunc(SwsContext *c)
Return function pointer to fastest main scaler path function depending on architecture and available ...
Definition: swscale.c:583
#define SRC_PIXELS
Definition: sw_scale.c:38
#define fail()
Definition: checkasm.h:123
int hChrFilterSize
Horizontal filter size for chroma pixels.
#define width
int32_t
AVFormatContext * ctx
Definition: movenc.c:48
void sws_freeContext(struct SwsContext *swsContext)
Free the swscaler context swsContext.
Definition: utils.c:2319
#define FILTER_SIZES
#define randomize_buffers(buf, size)
Definition: sw_scale.c:31
#define declare_func_emms(cpu_flags, ret,...)
Definition: checkasm.h:120
int dstW
Width of destination luma/alpha planes.
#define call_ref(...)
Definition: checkasm.h:129
#define AV_CPU_FLAG_MMX
standard MMX
Definition: cpu.h:31
#define MAX_FILTER_WIDTH
#define check_func(func,...)
Definition: checkasm.h:114
struct SwsContext * sws_alloc_context(void)
Allocate an empty SwsContext.
Definition: utils.c:1084
#define LOCAL_ALIGNED_32(t, v,...)
Definition: internal.h:137
common internal and external API header
static double c[64]
#define rnd()
Definition: checkasm.h:107
#define bench_new(...)
Definition: checkasm.h:261
#define call_new(...)
Definition: checkasm.h:201