FFmpeg: tests/tiny_ssim.c Source File

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tiny_ssim.c

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1 /*

3 *

4 * This program is free software; you can redistribute it and/or modify

5 * it under the terms of the GNU General Public License as published by

6 * the Free Software Foundation; either version 2 of the License, or

7 * (at your option) any later version.

8 *

9 * This program 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

12 * GNU General Public License for more details.

13 *

14 * You should have received a copy of the GNU General Public License

15 * along with this program; if not, write to the Free Software

16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110 USA

17 */

18 /*

19 * tiny_ssim.c

20 * Computes the Structural Similarity Metric between two rawYV12 video files.

21 * original algorithm:

22 * Z. Wang, A. C. Bovik, H. R. Sheikh and E. P. Simoncelli,

23 * "Image quality assessment: From error visibility to structural similarity,"

24 * IEEE Transactions on Image Processing, vol. 13, no. 4, pp. 600-612, Apr. 2004.

25 *

26 * To improve speed, this implementation uses the standard approximation of

27 * overlapped 8x8 block sums, rather than the original gaussian weights.

28 */

30 #include <inttypes.h>

31 #include <limits.h>

32 #include <math.h>

33 #include <stdio.h>

34 #include <stdlib.h>

36 #define FFSWAP(type,a,b) do{type SWAP_tmp= b; b= a; a= SWAP_tmp;}while(0)

37 #define FFMIN(a,b) ((a) > (b) ? (b) : (a))

39 #define BIT_DEPTH 8

40 #define PIXEL_MAX ((1 << BIT_DEPTH)-1)

41 typedef uint8_t pixel;

43 /****************************************************************************

44 * structural similarity metric

45 ****************************************************************************/

46 static void ssim_4x4x2_core( const pixel *pix1, intptr_t stride1,

47 const pixel *pix2, intptr_t stride2,

48 int sums[2][4] )

49 {

50 int x,y,z;

52 for( z = 0; z < 2; z++ )

53 {

54 uint32_t s1 = 0, s2 = 0, ss = 0, s12 = 0;

55 for( y = 0; y < 4; y++ )

56 for( x = 0; x < 4; x++ )

57 {

58 int a = pix1[x+y*stride1];

59 int b = pix2[x+y*stride2];

60 s1 += a;

61 s2 += b;

62 ss += a*a;

63 ss += b*b;

64 s12 += a*b;

65 }

66 sums[z][0] = s1;

67 sums[z][1] = s2;

68 sums[z][2] = ss;

69 sums[z][3] = s12;

70 pix1 += 4;

71 pix2 += 4;

72 }

73 }

75 static float ssim_end1( int s1, int s2, int ss, int s12 )

76 {

77 /* Maximum value for 10-bit is: ss*64 = (2^10-1)^2*16*4*64 = 4286582784, which will overflow in some cases.

78 * s1*s1, s2*s2, and s1*s2 also obtain this value for edge cases: ((2^10-1)*16*4)^2 = 4286582784.

79 * Maximum value for 9-bit is: ss*64 = (2^9-1)^2*16*4*64 = 1069551616, which will not overflow. */

80 #if BIT_DEPTH > 9

81 typedef float type;

82 static const float ssim_c1 = .01*.01*PIXEL_MAX*PIXEL_MAX*64;

83 static const float ssim_c2 = .03*.03*PIXEL_MAX*PIXEL_MAX*64*63;

84 #else

85 typedef int type;

86 static const int ssim_c1 = (int)(.01*.01*PIXEL_MAX*PIXEL_MAX*64 + .5);

87 static const int ssim_c2 = (int)(.03*.03*PIXEL_MAX*PIXEL_MAX*64*63 + .5);

88 #endif

89 type fs1 = s1;

90 type fs2 = s2;

91 type fss = ss;

92 type fs12 = s12;

93 type vars = fss*64 - fs1*fs1 - fs2*fs2;

94 type covar = fs12*64 - fs1*fs2;

95 return (float)(2*fs1*fs2 + ssim_c1) * (float)(2*covar + ssim_c2)

96 / ((float)(fs1*fs1 + fs2*fs2 + ssim_c1) * (float)(vars + ssim_c2));

97 }

99 static float ssim_end4( int sum0[5][4], int sum1[5][4], int width )

100 {

101 float ssim = 0.0;

102 int i;

103

104 for( i = 0; i < width; i++ )

105 ssim += ssim_end1( sum0[i][0] + sum0[i+1][0] + sum1[i][0] + sum1[i+1][0],

106 sum0[i][1] + sum0[i+1][1] + sum1[i][1] + sum1[i+1][1],

107 sum0[i][2] + sum0[i+1][2] + sum1[i][2] + sum1[i+1][2],

108 sum0[i][3] + sum0[i+1][3] + sum1[i][3] + sum1[i+1][3] );

109 return ssim;

110 }

111

112 float ssim_plane(

113 pixel *pix1, intptr_t stride1,

114 pixel *pix2, intptr_t stride2,

115 int width, int height, void *buf, int *cnt )

116 {

117 int z = 0;

118 int x, y;

119 float ssim = 0.0;

120 int (*sum0)[4] = buf;

121 int (*sum1)[4] = sum0 + (width >> 2) + 3;

122 width >>= 2;

123 height >>= 2;

124 for( y = 1; y < height; y++ )

125 {

126 for( ; z <= y; z++ )

127 {

128 FFSWAP( void*, sum0, sum1 );

129 for( x = 0; x < width; x+=2 )

130 ssim_4x4x2_core( &pix1[4*(x+z*stride1)], stride1, &pix2[4*(x+z*stride2)], stride2, &sum0[x] );

131 }

132 for( x = 0; x < width-1; x += 4 )

133 ssim += ssim_end4( sum0+x, sum1+x, FFMIN(4,width-x-1) );

134 }

135 // *cnt = (height-1) * (width-1);

136 return ssim / ((height-1) * (width-1));

137 }

138

139

140 uint64_t ssd_plane( const uint8_t *pix1, const uint8_t *pix2, int size )

141 {

142 uint64_t ssd = 0;

143 int i;

144 for( i=0; i<size; i++ )

145 {

146 int d = pix1[i] - pix2[i];

147 ssd += d*d;

148 }

149 return ssd;

150 }

151

152 static double ssd_to_psnr( uint64_t ssd, uint64_t denom )

153 {

154 return -10*log((double)ssd/(denom*255*255))/log(10);

155 }

156

157 static double ssim_db( double ssim, double weight )

158 {

159 return 10*(log(weight)/log(10)-log(weight-ssim)/log(10));

160 }

161

162 static void print_results(uint64_t ssd[3], double ssim[3], int frames, int w, int h)

163 {

164 printf( "PSNR Y:%.3f U:%.3f V:%.3f All:%.3f | ",

165 ssd_to_psnr( ssd[0], (uint64_t)frames*w*h ),

166 ssd_to_psnr( ssd[1], (uint64_t)frames*w*h/4 ),

167 ssd_to_psnr( ssd[2], (uint64_t)frames*w*h/4 ),

168 ssd_to_psnr( ssd[0] + ssd[1] + ssd[2], (uint64_t)frames*w*h*3/2 ) );

169 printf( "SSIM Y:%.5f U:%.5f V:%.5f All:%.5f (%.5f)",

170 ssim[0] / frames,

171 ssim[1] / frames,

172 ssim[2] / frames,

173 (ssim[0]*4 + ssim[1] + ssim[2]) / (frames*6),

174 ssim_db(ssim[0] * 4 + ssim[1] + ssim[2], frames*6));

175 }

176

177 int main(int argc, char* argv[])

178 {

179 FILE *f[2];

180 uint8_t *buf[2], *plane[2][3];

181 int *temp;

182 uint64_t ssd[3] = {0,0,0};

183 double ssim[3] = {0,0,0};

184 int frame_size, w, h;

185 int frames, seek;

186 int i;

187

188 if( argc<4 || 2 != sscanf(argv[3], "%dx%d", &w, &h) )

189 {

190 printf("tiny_ssim <file1.yuv> <file2.yuv> <width>x<height> [<seek>]\n");

191 return -1;

192 }

193

194 f[0] = fopen(argv[1], "rb");

195 f[1] = fopen(argv[2], "rb");

196 sscanf(argv[3], "%dx%d", &w, &h);

197

198 if (w<=0 || h<=0 || w*(int64_t)h >= INT_MAX/3 || 2LL*w+12 >= INT_MAX / sizeof(*temp)) {

199 fprintf(stderr, "Dimensions are too large, or invalid\n");

200 return -2;

201 }

202

203 frame_size = w*h*3LL/2;

204 for( i=0; i<2; i++ )

205 {

206 buf[i] = malloc(frame_size);

207 plane[i][0] = buf[i];

208 plane[i][1] = plane[i][0] + w*h;

209 plane[i][2] = plane[i][1] + w*h/4;

210 }

211 temp = malloc((2*w+12)*sizeof(*temp));

212 seek = argc<5 ? 0 : atoi(argv[4]);

213 fseek(f[seek<0], seek < 0 ? -seek : seek, SEEK_SET);

214

215 for( frames=0;; frames++ )

216 {

217 uint64_t ssd_one[3];

218 double ssim_one[3];

219 if( fread(buf[0], frame_size, 1, f[0]) != 1) break;

220 if( fread(buf[1], frame_size, 1, f[1]) != 1) break;

221 for( i=0; i<3; i++ )

222 {

223 ssd_one[i] = ssd_plane ( plane[0][i], plane[1][i], w*h>>2*!!i );

224 ssim_one[i] = ssim_plane( plane[0][i], w>>!!i,

225 plane[1][i], w>>!!i,

226 w>>!!i, h>>!!i, temp, NULL );

227 ssd[i] += ssd_one[i];

228 ssim[i] += ssim_one[i];

229 }

230

231 printf("Frame %d | ", frames);

232 print_results(ssd_one, ssim_one, 1, w, h);

233 printf(" \r");

234 fflush(stdout);

235 }

236

237 if( !frames ) return 0;

238

239 printf("Total %d frames | ", frames);

240 print_results(ssd, ssim, frames, w, h);

241 printf("\n");

242

243 return 0;

244 }

FFMIN

#define FFMIN(a, b)

Definition: tiny_ssim.c:37

printf

__device__ int printf(const char *,...)

print_results

static void print_results(uint64_t ssd[3], double ssim[3], int frames, int w, int h)

Definition: tiny_ssim.c:162

ssim_plane

float ssim_plane(pixel *pix1, intptr_t stride1, pixel *pix2, intptr_t stride2, int width, int height, void *buf, int *cnt)

Definition: tiny_ssim.c:112

int64_t

long long int64_t

Definition: coverity.c:34

normalize.log

log

Definition: normalize.py:21

uint8_t w

Definition: llviddspenc.c:38

#define b

Definition: input.c:42

FFSWAP

#define FFSWAP(type, a, b)

Definition: tiny_ssim.c:36

frames

if it could not because there are no more frames

Definition: filter_design.txt:267

weight

const h264_weight_func weight

Definition: h264dsp_init.c:33

type

it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf type

Definition: writing_filters.txt:86

#define ss(width, name, subs,...)

Definition: cbs_vp9.c:202

PIXEL_MAX

#define PIXEL_MAX

Definition: tiny_ssim.c:40

main

int main(int argc, char *argv[])

Definition: tiny_ssim.c:177

frame_size

int frame_size

Definition: mxfenc.c:2474

limits.h

NULL

#define NULL

Definition: coverity.c:32

pixel

uint8_t pixel

Definition: tiny_ssim.c:41

vars

static const uint8_t vars[2][12]

Definition: camellia.c:183

seek

static void BS_FUNC() seek(BSCTX *bc, unsigned pos)

Seek to the given bit position.

Definition: bitstream_template.h:407

ssim_db

static double ssim_db(double ssim, double weight)

Definition: tiny_ssim.c:157

Definition: af_crystalizer.c:122

height

#define height

Definition: dsp.h:89

size

int size

Definition: twinvq_data.h:10344

The reader does not expect b to be semantically here and if the code is changed by maybe adding a a division or other the signedness will almost certainly be mistaken To avoid this confusion a new type was SUINT is the C unsigned type but it holds a signed int to use the same example SUINT a

Definition: undefined.txt:41

ssd_plane

uint64_t ssd_plane(const uint8_t *pix1, const uint8_t *pix2, int size)

Definition: tiny_ssim.c:140

ssd_to_psnr

static double ssd_to_psnr(uint64_t ssd, uint64_t denom)

Definition: tiny_ssim.c:152

#define i(width, name, range_min, range_max)

Definition: cbs_h2645.c:256

ssim_end4

static float ssim_end4(int sum0[5][4], int sum1[5][4], int width)

Definition: tiny_ssim.c:99