FFmpeg
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
swscale.c
Go to the documentation of this file.
1 /*
2  * Copyright (C) 2003-2011 Michael Niedermayer <michaelni@gmx.at>
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 <stdio.h>
22 #include <stdlib.h>
23 #include <string.h>
24 #include <inttypes.h>
25 #include <stdarg.h>
26 
27 #undef HAVE_AV_CONFIG_H
28 #include "libavutil/cpu.h"
29 #include "libavutil/imgutils.h"
30 #include "libavutil/mem.h"
31 #include "libavutil/avutil.h"
32 #include "libavutil/crc.h"
33 #include "libavutil/pixdesc.h"
34 #include "libavutil/lfg.h"
35 
36 #include "libswscale/swscale.h"
37 
38 /* HACK Duplicated from swscale_internal.h.
39  * Should be removed when a cleaner pixel format system exists. */
40 #define isGray(x) \
41  ((x) == AV_PIX_FMT_GRAY8 || \
42  (x) == AV_PIX_FMT_YA8 || \
43  (x) == AV_PIX_FMT_GRAY16BE || \
44  (x) == AV_PIX_FMT_GRAY16LE || \
45  (x) == AV_PIX_FMT_YA16BE || \
46  (x) == AV_PIX_FMT_YA16LE)
47 #define hasChroma(x) \
48  (!(isGray(x) || \
49  (x) == AV_PIX_FMT_MONOBLACK || \
50  (x) == AV_PIX_FMT_MONOWHITE))
51 #define isALPHA(x) \
52  ((x) == AV_PIX_FMT_BGR32 || \
53  (x) == AV_PIX_FMT_BGR32_1 || \
54  (x) == AV_PIX_FMT_RGB32 || \
55  (x) == AV_PIX_FMT_RGB32_1 || \
56  (x) == AV_PIX_FMT_YUVA420P)
57 
58 static uint64_t getSSD(const uint8_t *src1, const uint8_t *src2, int stride1,
59  int stride2, int w, int h)
60 {
61  int x, y;
62  uint64_t ssd = 0;
63 
64  for (y = 0; y < h; y++) {
65  for (x = 0; x < w; x++) {
66  int d = src1[x + y * stride1] - src2[x + y * stride2];
67  ssd += d * d;
68  }
69  }
70  return ssd;
71 }
72 
73 struct Results {
74  uint64_t ssdY;
75  uint64_t ssdU;
76  uint64_t ssdV;
77  uint64_t ssdA;
78  uint32_t crc;
79 };
80 
81 // test by ref -> src -> dst -> out & compare out against ref
82 // ref & out are YV12
83 static int doTest(uint8_t *ref[4], int refStride[4], int w, int h,
84  enum AVPixelFormat srcFormat, enum AVPixelFormat dstFormat,
85  int srcW, int srcH, int dstW, int dstH, int flags,
86  struct Results *r)
87 {
89  const AVPixFmtDescriptor *desc_src = av_pix_fmt_desc_get(srcFormat);
90  const AVPixFmtDescriptor *desc_dst = av_pix_fmt_desc_get(dstFormat);
91  static enum AVPixelFormat cur_srcFormat;
92  static int cur_srcW, cur_srcH;
93  static uint8_t *src[4];
94  static int srcStride[4];
95  uint8_t *dst[4] = { 0 };
96  uint8_t *out[4] = { 0 };
97  int dstStride[4] = {0};
98  int i;
99  uint64_t ssdY, ssdU = 0, ssdV = 0, ssdA = 0;
100  struct SwsContext *dstContext = NULL, *outContext = NULL;
101  uint32_t crc = 0;
102  int res = 0;
103 
104  if (cur_srcFormat != srcFormat || cur_srcW != srcW || cur_srcH != srcH) {
105  struct SwsContext *srcContext = NULL;
106  int p;
107 
108  for (p = 0; p < 4; p++)
109  av_freep(&src[p]);
110 
111  res = av_image_fill_linesizes(srcStride, srcFormat, srcW);
112  if (res < 0) {
113  fprintf(stderr, "av_image_fill_linesizes failed\n");
114  goto end;
115  }
116  for (p = 0; p < 4; p++) {
117  srcStride[p] = FFALIGN(srcStride[p], 16);
118  if (srcStride[p])
119  src[p] = av_mallocz(srcStride[p] * srcH + 16);
120  if (srcStride[p] && !src[p]) {
121  perror("Malloc");
122  res = -1;
123  goto end;
124  }
125  }
126  srcContext = sws_getContext(w, h, AV_PIX_FMT_YUVA420P, srcW, srcH,
127  srcFormat, SWS_BILINEAR, NULL, NULL, NULL);
128  if (!srcContext) {
129  fprintf(stderr, "Failed to get %s ---> %s\n",
130  desc_yuva420p->name,
131  desc_src->name);
132  res = -1;
133  goto end;
134  }
135  sws_scale(srcContext, (const uint8_t * const*)ref, refStride, 0, h, src, srcStride);
136  sws_freeContext(srcContext);
137 
138  cur_srcFormat = srcFormat;
139  cur_srcW = srcW;
140  cur_srcH = srcH;
141  }
142 
143  res = av_image_fill_linesizes(dstStride, dstFormat, dstW);
144  if (res < 0) {
145  fprintf(stderr, "av_image_fill_linesizes failed\n");
146  goto end;
147  }
148 
149  for (i = 0; i < 4; i++) {
150  /* Image buffers passed into libswscale can be allocated any way you
151  * prefer, as long as they're aligned enough for the architecture, and
152  * they're freed appropriately (such as using av_free for buffers
153  * allocated with av_malloc). */
154  /* An extra 16 bytes is being allocated because some scalers may write
155  * out of bounds. */
156  dstStride[i] = FFALIGN(dstStride[i], 16);
157  if (dstStride[i])
158  dst[i] = av_mallocz(dstStride[i] * dstH + 16);
159  if (dstStride[i] && !dst[i]) {
160  perror("Malloc");
161  res = -1;
162 
163  goto end;
164  }
165  }
166 
167  dstContext = sws_getContext(srcW, srcH, srcFormat, dstW, dstH, dstFormat,
168  flags, NULL, NULL, NULL);
169  if (!dstContext) {
170  fprintf(stderr, "Failed to get %s ---> %s\n",
171  desc_src->name, desc_dst->name);
172  res = -1;
173  goto end;
174  }
175 
176  printf(" %s %dx%d -> %s %3dx%3d flags=%2d",
177  desc_src->name, srcW, srcH,
178  desc_dst->name, dstW, dstH,
179  flags);
180  fflush(stdout);
181 
182  sws_scale(dstContext, (const uint8_t * const*)src, srcStride, 0, srcH, dst, dstStride);
183 
184  for (i = 0; i < 4 && dstStride[i]; i++)
185  crc = av_crc(av_crc_get_table(AV_CRC_32_IEEE), crc, dst[i],
186  dstStride[i] * dstH);
187 
188  if (r && crc == r->crc) {
189  ssdY = r->ssdY;
190  ssdU = r->ssdU;
191  ssdV = r->ssdV;
192  ssdA = r->ssdA;
193  } else {
194  for (i = 0; i < 4; i++) {
195  refStride[i] = FFALIGN(refStride[i], 16);
196  if (refStride[i])
197  out[i] = av_mallocz(refStride[i] * h);
198  if (refStride[i] && !out[i]) {
199  perror("Malloc");
200  res = -1;
201  goto end;
202  }
203  }
204  outContext = sws_getContext(dstW, dstH, dstFormat, w, h,
206  NULL, NULL, NULL);
207  if (!outContext) {
208  fprintf(stderr, "Failed to get %s ---> %s\n",
209  desc_dst->name,
210  desc_yuva420p->name);
211  res = -1;
212  goto end;
213  }
214  sws_scale(outContext, (const uint8_t * const*)dst, dstStride, 0, dstH, out, refStride);
215 
216  ssdY = getSSD(ref[0], out[0], refStride[0], refStride[0], w, h);
217  if (hasChroma(srcFormat) && hasChroma(dstFormat)) {
218  //FIXME check that output is really gray
219  ssdU = getSSD(ref[1], out[1], refStride[1], refStride[1],
220  (w + 1) >> 1, (h + 1) >> 1);
221  ssdV = getSSD(ref[2], out[2], refStride[2], refStride[2],
222  (w + 1) >> 1, (h + 1) >> 1);
223  }
224  if (isALPHA(srcFormat) && isALPHA(dstFormat))
225  ssdA = getSSD(ref[3], out[3], refStride[3], refStride[3], w, h);
226 
227  ssdY /= w * h;
228  ssdU /= w * h / 4;
229  ssdV /= w * h / 4;
230  ssdA /= w * h;
231 
232  sws_freeContext(outContext);
233 
234  for (i = 0; i < 4; i++)
235  if (refStride[i])
236  av_free(out[i]);
237  }
238 
239  printf(" CRC=%08x SSD=%5"PRId64 ",%5"PRId64 ",%5"PRId64 ",%5"PRId64 "\n",
240  crc, ssdY, ssdU, ssdV, ssdA);
241 
242 end:
243  sws_freeContext(dstContext);
244 
245  for (i = 0; i < 4; i++)
246  if (dstStride[i])
247  av_free(dst[i]);
248 
249  return res;
250 }
251 
252 static void selfTest(uint8_t *ref[4], int refStride[4], int w, int h,
253  enum AVPixelFormat srcFormat_in,
254  enum AVPixelFormat dstFormat_in)
255 {
257  SWS_X, SWS_POINT, SWS_AREA, 0 };
258  const int srcW = w;
259  const int srcH = h;
260  const int dstW[] = { srcW - srcW / 3, srcW, srcW + srcW / 3, 0 };
261  const int dstH[] = { srcH - srcH / 3, srcH, srcH + srcH / 3, 0 };
263  const AVPixFmtDescriptor *desc_src, *desc_dst;
264 
265  for (srcFormat = srcFormat_in != AV_PIX_FMT_NONE ? srcFormat_in : 0;
266  srcFormat < AV_PIX_FMT_NB; srcFormat++) {
267  if (!sws_isSupportedInput(srcFormat) ||
268  !sws_isSupportedOutput(srcFormat))
269  continue;
270 
271  desc_src = av_pix_fmt_desc_get(srcFormat);
272 
273  for (dstFormat = dstFormat_in != AV_PIX_FMT_NONE ? dstFormat_in : 0;
274  dstFormat < AV_PIX_FMT_NB; dstFormat++) {
275  int i, j, k;
276  int res = 0;
277 
278  if (!sws_isSupportedInput(dstFormat) ||
279  !sws_isSupportedOutput(dstFormat))
280  continue;
281 
282  desc_dst = av_pix_fmt_desc_get(dstFormat);
283 
284  printf("%s -> %s\n", desc_src->name, desc_dst->name);
285  fflush(stdout);
286 
287  for (k = 0; flags[k] && !res; k++)
288  for (i = 0; dstW[i] && !res; i++)
289  for (j = 0; dstH[j] && !res; j++)
290  res = doTest(ref, refStride, w, h,
291  srcFormat, dstFormat,
292  srcW, srcH, dstW[i], dstH[j], flags[k],
293  NULL);
294  if (dstFormat_in != AV_PIX_FMT_NONE)
295  break;
296  }
297  if (srcFormat_in != AV_PIX_FMT_NONE)
298  break;
299  }
300 }
301 
302 static int fileTest(uint8_t *ref[4], int refStride[4], int w, int h, FILE *fp,
303  enum AVPixelFormat srcFormat_in,
304  enum AVPixelFormat dstFormat_in)
305 {
306  char buf[256];
307 
308  while (fgets(buf, sizeof(buf), fp)) {
309  struct Results r;
310  enum AVPixelFormat srcFormat;
311  char srcStr[12];
312  int srcW, srcH;
313  enum AVPixelFormat dstFormat;
314  char dstStr[12];
315  int dstW, dstH;
316  int flags;
317  int ret;
318 
319  ret = sscanf(buf,
320  " %12s %dx%d -> %12s %dx%d flags=%d CRC=%x"
321  " SSD=%"SCNd64 ", %"SCNd64 ", %"SCNd64 ", %"SCNd64 "\n",
322  srcStr, &srcW, &srcH, dstStr, &dstW, &dstH,
323  &flags, &r.crc, &r.ssdY, &r.ssdU, &r.ssdV, &r.ssdA);
324  if (ret != 12) {
325  srcStr[0] = dstStr[0] = 0;
326  ret = sscanf(buf, "%12s -> %12s\n", srcStr, dstStr);
327  }
328 
329  srcFormat = av_get_pix_fmt(srcStr);
330  dstFormat = av_get_pix_fmt(dstStr);
331 
332  if (srcFormat == AV_PIX_FMT_NONE || dstFormat == AV_PIX_FMT_NONE ||
333  srcW > 8192U || srcH > 8192U || dstW > 8192U || dstH > 8192U) {
334  fprintf(stderr, "malformed input file\n");
335  return -1;
336  }
337  if ((srcFormat_in != AV_PIX_FMT_NONE && srcFormat_in != srcFormat) ||
338  (dstFormat_in != AV_PIX_FMT_NONE && dstFormat_in != dstFormat))
339  continue;
340  if (ret != 12) {
341  printf("%s", buf);
342  continue;
343  }
344 
345  doTest(ref, refStride, w, h,
346  srcFormat, dstFormat,
347  srcW, srcH, dstW, dstH, flags,
348  &r);
349  }
350 
351  return 0;
352 }
353 
354 #define W 96
355 #define H 96
356 
357 int main(int argc, char **argv)
358 {
359  enum AVPixelFormat srcFormat = AV_PIX_FMT_NONE;
360  enum AVPixelFormat dstFormat = AV_PIX_FMT_NONE;
361  uint8_t *rgb_data = av_malloc(W * H * 4);
362  const uint8_t * const rgb_src[4] = { rgb_data, NULL, NULL, NULL };
363  int rgb_stride[4] = { 4 * W, 0, 0, 0 };
364  uint8_t *data = av_malloc(4 * W * H);
365  uint8_t *src[4] = { data, data + W * H, data + W * H * 2, data + W * H * 3 };
366  int stride[4] = { W, W, W, W };
367  int x, y;
368  struct SwsContext *sws;
369  AVLFG rand;
370  int res = -1;
371  int i;
372  FILE *fp = NULL;
373 
374  if (!rgb_data || !data)
375  return -1;
376 
377  for (i = 1; i < argc; i += 2) {
378  if (argv[i][0] != '-' || i + 1 == argc)
379  goto bad_option;
380  if (!strcmp(argv[i], "-ref")) {
381  fp = fopen(argv[i + 1], "r");
382  if (!fp) {
383  fprintf(stderr, "could not open '%s'\n", argv[i + 1]);
384  goto error;
385  }
386  } else if (!strcmp(argv[i], "-cpuflags")) {
387  unsigned flags = av_get_cpu_flags();
388  int ret = av_parse_cpu_caps(&flags, argv[i + 1]);
389  if (ret < 0) {
390  fprintf(stderr, "invalid cpu flags %s\n", argv[i + 1]);
391  return ret;
392  }
393  av_force_cpu_flags(flags);
394  } else if (!strcmp(argv[i], "-src")) {
395  srcFormat = av_get_pix_fmt(argv[i + 1]);
396  if (srcFormat == AV_PIX_FMT_NONE) {
397  fprintf(stderr, "invalid pixel format %s\n", argv[i + 1]);
398  return -1;
399  }
400  } else if (!strcmp(argv[i], "-dst")) {
401  dstFormat = av_get_pix_fmt(argv[i + 1]);
402  if (dstFormat == AV_PIX_FMT_NONE) {
403  fprintf(stderr, "invalid pixel format %s\n", argv[i + 1]);
404  return -1;
405  }
406  } else {
407 bad_option:
408  fprintf(stderr, "bad option or argument missing (%s)\n", argv[i]);
409  goto error;
410  }
411  }
412 
413  sws = sws_getContext(W / 12, H / 12, AV_PIX_FMT_RGB32, W, H,
415 
416  av_lfg_init(&rand, 1);
417 
418  for (y = 0; y < H; y++)
419  for (x = 0; x < W * 4; x++)
420  rgb_data[ x + y * 4 * W] = av_lfg_get(&rand);
421  sws_scale(sws, rgb_src, rgb_stride, 0, H / 12, src, stride);
422  sws_freeContext(sws);
423  av_free(rgb_data);
424 
425  if(fp) {
426  res = fileTest(src, stride, W, H, fp, srcFormat, dstFormat);
427  fclose(fp);
428  } else {
429  selfTest(src, stride, W, H, srcFormat, dstFormat);
430  res = 0;
431  }
432 error:
433  av_free(data);
434 
435  return res;
436 }
Definition: lfg.h:25
#define NULL
Definition: coverity.c:32
const AVPixFmtDescriptor * av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
Definition: pixdesc.c:2266
#define SWS_X
Definition: swscale.h:61
#define SWS_BICUBIC
Definition: swscale.h:60
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:101
misc image utilities
Memory handling functions.
#define hasChroma(x)
Definition: swscale.c:47
Convenience header that includes libavutil's core.
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
Definition: mem.c:252
uint64_t ssdY
Definition: swscale.c:74
static uint64_t getSSD(const uint8_t *src1, const uint8_t *src2, int stride1, int stride2, int w, int h)
Definition: swscale.c:58
static int doTest(uint8_t *ref[4], int refStride[4], int w, int h, enum AVPixelFormat srcFormat, enum AVPixelFormat dstFormat, int srcW, int srcH, int dstW, int dstH, int flags, struct Results *r)
Definition: swscale.c:83
int main(int argc, char **argv)
Definition: swscale.c:357
int srcH
Height of source luma/alpha planes.
#define SWS_BILINEAR
Definition: swscale.h:59
planar YUV 4:2:0, 20bpp, (1 Cr & Cb sample per 2x2 Y & A samples)
Definition: pixfmt.h:102
uint8_t
#define av_malloc(s)
static av_cold int end(AVCodecContext *avctx)
Definition: avrndec.c:90
#define H
Definition: swscale.c:355
Public header for CRC hash function implementation.
#define SWS_FAST_BILINEAR
Definition: swscale.h:58
struct SwsContext * sws_getContext(int srcW, int srcH, enum AVPixelFormat srcFormat, int dstW, int dstH, enum AVPixelFormat dstFormat, int flags, SwsFilter *srcFilter, SwsFilter *dstFilter, const double *param)
Allocate and return an SwsContext.
Definition: utils.c:1854
external API header
enum AVPixelFormat dstFormat
Destination pixel format.
#define isALPHA(x)
Definition: swscale.c:51
#define FFALIGN(x, a)
Definition: macros.h:48
const char * name
Definition: pixdesc.h:82
int dstH
Height of destination luma/alpha planes.
#define U(x)
Definition: vp56_arith.h:37
#define sws_isSupportedOutput(x)
const char * r
Definition: vf_curves.c:111
int av_parse_cpu_caps(unsigned *flags, const char *s)
Parse CPU caps from a string and update the given AV_CPU_* flags based on that.
Definition: cpu.c:181
uint64_t ssdA
Definition: swscale.c:77
uint32_t av_crc(const AVCRC *ctx, uint32_t crc, const uint8_t *buffer, size_t length)
Calculate the CRC of a block.
Definition: crc.c:357
void sws_freeContext(struct SwsContext *swsContext)
Free the swscaler context swsContext.
Definition: utils.c:2274
#define sws_isSupportedInput(x)
#define src
Definition: vp9dsp.c:530
int dstW
Width of destination luma/alpha planes.
uint32_t crc
Definition: swscale.c:78
#define src1
Definition: h264pred.c:139
Descriptor that unambiguously describes how the bits of a pixel are stored in the up to 4 data planes...
Definition: pixdesc.h:81
#define AV_PIX_FMT_RGB32
Definition: pixfmt.h:318
#define fp
Definition: regdef.h:44
static int fileTest(uint8_t *ref[4], int refStride[4], int w, int h, FILE *fp, enum AVPixelFormat srcFormat_in, enum AVPixelFormat dstFormat_in)
Definition: swscale.c:302
int attribute_align_arg sws_scale(struct SwsContext *c, const uint8_t *const srcSlice[], const int srcStride[], int srcSliceY, int srcSliceH, uint8_t *const dst[], const int dstStride[])
swscale wrapper, so we don't need to export the SwsContext.
Definition: swscale.c:753
static unsigned int av_lfg_get(AVLFG *c)
Get the next random unsigned 32-bit number using an ALFG.
Definition: lfg.h:38
void * buf
Definition: avisynth_c.h:690
uint64_t ssdU
Definition: swscale.c:75
#define SWS_AREA
Definition: swscale.h:63
int av_image_fill_linesizes(int linesizes[4], enum AVPixelFormat pix_fmt, int width)
Fill plane linesizes for an image with pixel format pix_fmt and width width.
Definition: imgutils.c:88
uint64_t ssdV
Definition: swscale.c:76
av_cold void av_lfg_init(AVLFG *c, unsigned int seed)
Definition: lfg.c:30
int av_get_cpu_flags(void)
Return the flags which specify extensions supported by the CPU.
Definition: cpu.c:76
#define SWS_POINT
Definition: swscale.h:62
static int flags
Definition: cpu.c:47
static void selfTest(uint8_t *ref[4], int refStride[4], int w, int h, enum AVPixelFormat srcFormat_in, enum AVPixelFormat dstFormat_in)
Definition: swscale.c:252
const AVCRC * av_crc_get_table(AVCRCId crc_id)
Get an initialized standard CRC table.
Definition: crc.c:343
#define W
Definition: swscale.c:354
GLint GLenum GLboolean GLsizei stride
Definition: opengl_enc.c:105
static int ref[MAX_W *MAX_W]
Definition: jpeg2000dwt.c:107
enum AVPixelFormat srcFormat
Source pixel format.
#define av_free(p)
number of pixel formats, DO NOT USE THIS if you want to link with shared libav* because the number of...
Definition: pixfmt.h:309
FILE * out
Definition: movenc.c:54
#define av_freep(p)
enum AVPixelFormat av_get_pix_fmt(const char *name)
Return the pixel format corresponding to name.
Definition: pixdesc.c:2194
void av_force_cpu_flags(int arg)
Disables cpu detection and forces the specified flags.
Definition: cpu.c:49
int srcW
Width of source luma/alpha planes.
AVPixelFormat
Pixel format.
Definition: pixfmt.h:60