FFmpeg: libavfilter/vf_super2xsai.c Source File

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libavfilter

vf_super2xsai.c

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1 /*

5 *

6 * This file is part of FFmpeg.

7 *

8 * FFmpeg is free software; you can redistribute it and/or modify

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

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

11 * (at your option) any later version.

12 *

13 * FFmpeg is distributed in the hope that it will be useful,

14 * but WITHOUT ANY WARRANTY; without even the implied warranty of

15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

16 * GNU General Public License for more details.

17 *

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

19 * with FFmpeg; if not, write to the Free Software Foundation, Inc.,

20 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

21 */

23 /**

24 * @file

25 * Super 2xSaI video filter

26 * Ported from MPlayer libmpcodecs/vf_2xsai.c.

27 */

29 #include "libavutil/pixdesc.h"

30 #include "libavutil/intreadwrite.h"

31 #include "avfilter.h"

32 #include "formats.h"

33 #include "internal.h"

34 #include "video.h"

36 typedef struct {

37 /* masks used for two pixels interpolation */

38 uint32_t hi_pixel_mask;

39 uint32_t lo_pixel_mask;

41 /* masks used for four pixels interpolation */

42 uint32_t q_hi_pixel_mask;

43 uint32_t q_lo_pixel_mask;

45 int bpp; ///< bytes per pixel, pixel stride for each (packed) pixel

46 int is_be;

47 } Super2xSaIContext;

49 #define GET_RESULT(A, B, C, D) ((A != C || A != D) - (B != C || B != D))

51 #define INTERPOLATE(A, B) (((A & hi_pixel_mask) >> 1) + ((B & hi_pixel_mask) >> 1) + (A & B & lo_pixel_mask))

53 #define Q_INTERPOLATE(A, B, C, D) ((A & q_hi_pixel_mask) >> 2) + ((B & q_hi_pixel_mask) >> 2) + ((C & q_hi_pixel_mask) >> 2) + ((D & q_hi_pixel_mask) >> 2) \

54 + ((((A & q_lo_pixel_mask) + (B & q_lo_pixel_mask) + (C & q_lo_pixel_mask) + (D & q_lo_pixel_mask)) >> 2) & q_lo_pixel_mask)

56 static void super2xsai(AVFilterContext *ctx,

57 uint8_t *src, int src_linesize,

58 uint8_t *dst, int dst_linesize,

59 int width, int height)

60 {

61 Super2xSaIContext *sai = ctx->priv;

62 unsigned int x, y;

63 uint32_t color[4][4];

64 unsigned char *src_line[4];

65 const int bpp = sai->bpp;

66 const uint32_t hi_pixel_mask = sai->hi_pixel_mask;

67 const uint32_t lo_pixel_mask = sai->lo_pixel_mask;

68 const uint32_t q_hi_pixel_mask = sai->q_hi_pixel_mask;

69 const uint32_t q_lo_pixel_mask = sai->q_lo_pixel_mask;

71 /* Point to the first 4 lines, first line is duplicated */

72 src_line[0] = src;

73 src_line[1] = src;

74 src_line[2] = src + src_linesize*FFMIN(1, height-1);

75 src_line[3] = src + src_linesize*FFMIN(2, height-1);

77 #define READ_COLOR4(dst, src_line, off) dst = *((const uint32_t *)src_line + off)

78 #define READ_COLOR3(dst, src_line, off) dst = AV_RL24 (src_line + 3*off)

79 #define READ_COLOR2(dst, src_line, off) dst = sai->is_be ? AV_RB16(src_line + 2 * off) : AV_RL16(src_line + 2 * off)

81 for (y = 0; y < height; y++) {

82 uint8_t *dst_line[2];

84 dst_line[0] = dst + dst_linesize*2*y;

85 dst_line[1] = dst + dst_linesize*(2*y+1);

87 switch (bpp) {

88 case 4:

89 READ_COLOR4(color[0][0], src_line[0], 0); color[0][1] = color[0][0]; READ_COLOR4(color[0][2], src_line[0], 1); READ_COLOR4(color[0][3], src_line[0], 2);

90 READ_COLOR4(color[1][0], src_line[1], 0); color[1][1] = color[1][0]; READ_COLOR4(color[1][2], src_line[1], 1); READ_COLOR4(color[1][3], src_line[1], 2);

91 READ_COLOR4(color[2][0], src_line[2], 0); color[2][1] = color[2][0]; READ_COLOR4(color[2][2], src_line[2], 1); READ_COLOR4(color[2][3], src_line[2], 2);

92 READ_COLOR4(color[3][0], src_line[3], 0); color[3][1] = color[3][0]; READ_COLOR4(color[3][2], src_line[3], 1); READ_COLOR4(color[3][3], src_line[3], 2);

93 break;

94 case 3:

95 READ_COLOR3(color[0][0], src_line[0], 0); color[0][1] = color[0][0]; READ_COLOR3(color[0][2], src_line[0], 1); READ_COLOR3(color[0][3], src_line[0], 2);

96 READ_COLOR3(color[1][0], src_line[1], 0); color[1][1] = color[1][0]; READ_COLOR3(color[1][2], src_line[1], 1); READ_COLOR3(color[1][3], src_line[1], 2);

97 READ_COLOR3(color[2][0], src_line[2], 0); color[2][1] = color[2][0]; READ_COLOR3(color[2][2], src_line[2], 1); READ_COLOR3(color[2][3], src_line[2], 2);

98 READ_COLOR3(color[3][0], src_line[3], 0); color[3][1] = color[3][0]; READ_COLOR3(color[3][2], src_line[3], 1); READ_COLOR3(color[3][3], src_line[3], 2);

99 break;

100 default:

101 READ_COLOR2(color[0][0], src_line[0], 0); color[0][1] = color[0][0]; READ_COLOR2(color[0][2], src_line[0], 1); READ_COLOR2(color[0][3], src_line[0], 2);

102 READ_COLOR2(color[1][0], src_line[1], 0); color[1][1] = color[1][0]; READ_COLOR2(color[1][2], src_line[1], 1); READ_COLOR2(color[1][3], src_line[1], 2);

103 READ_COLOR2(color[2][0], src_line[2], 0); color[2][1] = color[2][0]; READ_COLOR2(color[2][2], src_line[2], 1); READ_COLOR2(color[2][3], src_line[2], 2);

104 READ_COLOR2(color[3][0], src_line[3], 0); color[3][1] = color[3][0]; READ_COLOR2(color[3][2], src_line[3], 1); READ_COLOR2(color[3][3], src_line[3], 2);

105 }

106

107 for (x = 0; x < width; x++) {

108 uint32_t product1a, product1b, product2a, product2b;

109

110 //--------------------------------------- B0 B1 B2 B3 0 1 2 3

111 // 4 5* 6 S2 -> 4 5* 6 7

112 // 1 2 3 S1 8 9 10 11

113 // A0 A1 A2 A3 12 13 14 15

114 //--------------------------------------

115 if (color[2][1] == color[1][2] && color[1][1] != color[2][2]) {

116 product2b = color[2][1];

117 product1b = product2b;

118 } else if (color[1][1] == color[2][2] && color[2][1] != color[1][2]) {

119 product2b = color[1][1];

120 product1b = product2b;

121 } else if (color[1][1] == color[2][2] && color[2][1] == color[1][2]) {

122 int r = 0;

123

124 r += GET_RESULT(color[1][2], color[1][1], color[1][0], color[3][1]);

125 r += GET_RESULT(color[1][2], color[1][1], color[2][0], color[0][1]);

126 r += GET_RESULT(color[1][2], color[1][1], color[3][2], color[2][3]);

127 r += GET_RESULT(color[1][2], color[1][1], color[0][2], color[1][3]);

128

129 if (r > 0)

130 product1b = color[1][2];

131 else if (r < 0)

132 product1b = color[1][1];

133 else

134 product1b = INTERPOLATE(color[1][1], color[1][2]);

135

136 product2b = product1b;

137 } else {

138 if (color[1][2] == color[2][2] && color[2][2] == color[3][1] && color[2][1] != color[3][2] && color[2][2] != color[3][0])

139 product2b = Q_INTERPOLATE(color[2][2], color[2][2], color[2][2], color[2][1]);

140 else if (color[1][1] == color[2][1] && color[2][1] == color[3][2] && color[3][1] != color[2][2] && color[2][1] != color[3][3])

141 product2b = Q_INTERPOLATE(color[2][1], color[2][1], color[2][1], color[2][2]);

142 else

143 product2b = INTERPOLATE(color[2][1], color[2][2]);

144

145 if (color[1][2] == color[2][2] && color[1][2] == color[0][1] && color[1][1] != color[0][2] && color[1][2] != color[0][0])

146 product1b = Q_INTERPOLATE(color[1][2], color[1][2], color[1][2], color[1][1]);

147 else if (color[1][1] == color[2][1] && color[1][1] == color[0][2] && color[0][1] != color[1][2] && color[1][1] != color[0][3])

148 product1b = Q_INTERPOLATE(color[1][2], color[1][1], color[1][1], color[1][1]);

149 else

150 product1b = INTERPOLATE(color[1][1], color[1][2]);

151 }

152

153 if (color[1][1] == color[2][2] && color[2][1] != color[1][2] && color[1][0] == color[1][1] && color[1][1] != color[3][2])

154 product2a = INTERPOLATE(color[2][1], color[1][1]);

155 else if (color[1][1] == color[2][0] && color[1][2] == color[1][1] && color[1][0] != color[2][1] && color[1][1] != color[3][0])

156 product2a = INTERPOLATE(color[2][1], color[1][1]);

157 else

158 product2a = color[2][1];

159

160 if (color[2][1] == color[1][2] && color[1][1] != color[2][2] && color[2][0] == color[2][1] && color[2][1] != color[0][2])

161 product1a = INTERPOLATE(color[2][1], color[1][1]);

162 else if (color[1][0] == color[2][1] && color[2][2] == color[2][1] && color[2][0] != color[1][1] && color[2][1] != color[0][0])

163 product1a = INTERPOLATE(color[2][1], color[1][1]);

164 else

165 product1a = color[1][1];

166

167 /* Set the calculated pixels */

168 switch (bpp) {

169 case 4:

170 AV_WN32A(dst_line[0] + x * 8, product1a);

171 AV_WN32A(dst_line[0] + x * 8 + 4, product1b);

172 AV_WN32A(dst_line[1] + x * 8, product2a);

173 AV_WN32A(dst_line[1] + x * 8 + 4, product2b);

174 break;

175 case 3:

176 AV_WL24(dst_line[0] + x * 6, product1a);

177 AV_WL24(dst_line[0] + x * 6 + 3, product1b);

178 AV_WL24(dst_line[1] + x * 6, product2a);

179 AV_WL24(dst_line[1] + x * 6 + 3, product2b);

180 break;

181 default: // bpp = 2

182 if (sai->is_be) {

183 AV_WB32(dst_line[0] + x * 4, product1a | (product1b << 16));

184 AV_WB32(dst_line[1] + x * 4, product2a | (product2b << 16));

185 } else {

186 AV_WL32(dst_line[0] + x * 4, product1a | (product1b << 16));

187 AV_WL32(dst_line[1] + x * 4, product2a | (product2b << 16));

188 }

189 }

190

191 /* Move color matrix forward */

192 color[0][0] = color[0][1]; color[0][1] = color[0][2]; color[0][2] = color[0][3];

193 color[1][0] = color[1][1]; color[1][1] = color[1][2]; color[1][2] = color[1][3];

194 color[2][0] = color[2][1]; color[2][1] = color[2][2]; color[2][2] = color[2][3];

195 color[3][0] = color[3][1]; color[3][1] = color[3][2]; color[3][2] = color[3][3];

196

197 if (x < width - 3) {

198 x += 3;

199 switch (bpp) {

200 case 4:

201 READ_COLOR4(color[0][3], src_line[0], x);

202 READ_COLOR4(color[1][3], src_line[1], x);

203 READ_COLOR4(color[2][3], src_line[2], x);

204 READ_COLOR4(color[3][3], src_line[3], x);

205 break;

206 case 3:

207 READ_COLOR3(color[0][3], src_line[0], x);

208 READ_COLOR3(color[1][3], src_line[1], x);

209 READ_COLOR3(color[2][3], src_line[2], x);

210 READ_COLOR3(color[3][3], src_line[3], x);

211 break;

212 default: /* case 2 */

213 READ_COLOR2(color[0][3], src_line[0], x);

214 READ_COLOR2(color[1][3], src_line[1], x);

215 READ_COLOR2(color[2][3], src_line[2], x);

216 READ_COLOR2(color[3][3], src_line[3], x);

217 }

218 x -= 3;

219 }

220 }

221

222 /* We're done with one line, so we shift the source lines up */

223 src_line[0] = src_line[1];

224 src_line[1] = src_line[2];

225 src_line[2] = src_line[3];

226

227 /* Read next line */

228 src_line[3] = src_line[2];

229 if (y < height - 3)

230 src_line[3] += src_linesize;

231 } // y loop

232 }

233

234 static int query_formats(AVFilterContext *ctx)

235 {

236 static const enum AVPixelFormat pix_fmts[] = {

237 AV_PIX_FMT_RGBA, AV_PIX_FMT_BGRA, AV_PIX_FMT_ARGB, AV_PIX_FMT_ABGR,

238 AV_PIX_FMT_RGB24, AV_PIX_FMT_BGR24,

239 AV_PIX_FMT_RGB565BE, AV_PIX_FMT_BGR565BE, AV_PIX_FMT_RGB555BE, AV_PIX_FMT_BGR555BE,

240 AV_PIX_FMT_RGB565LE, AV_PIX_FMT_BGR565LE, AV_PIX_FMT_RGB555LE, AV_PIX_FMT_BGR555LE,

241 AV_PIX_FMT_NONE

242 };

243

244 ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));

245 return 0;

246 }

247

248 static int config_input(AVFilterLink *inlink)

249 {

250 Super2xSaIContext *sai = inlink->dst->priv;

251

252 sai->hi_pixel_mask = 0xFEFEFEFE;

253 sai->lo_pixel_mask = 0x01010101;

254 sai->q_hi_pixel_mask = 0xFCFCFCFC;

255 sai->q_lo_pixel_mask = 0x03030303;

256 sai->bpp = 4;

257

258 switch (inlink->format) {

259 case AV_PIX_FMT_RGB24:

260 case AV_PIX_FMT_BGR24:

261 sai->bpp = 3;

262 break;

263

264 case AV_PIX_FMT_RGB565BE:

265 case AV_PIX_FMT_BGR565BE:

266 sai->is_be = 1;

267 case AV_PIX_FMT_RGB565LE:

268 case AV_PIX_FMT_BGR565LE:

269 sai->hi_pixel_mask = 0xF7DEF7DE;

270 sai->lo_pixel_mask = 0x08210821;

271 sai->q_hi_pixel_mask = 0xE79CE79C;

272 sai->q_lo_pixel_mask = 0x18631863;

273 sai->bpp = 2;

274 break;

275

276 case AV_PIX_FMT_BGR555BE:

277 case AV_PIX_FMT_RGB555BE:

278 sai->is_be = 1;

279 case AV_PIX_FMT_BGR555LE:

280 case AV_PIX_FMT_RGB555LE:

281 sai->hi_pixel_mask = 0x7BDE7BDE;

282 sai->lo_pixel_mask = 0x04210421;

283 sai->q_hi_pixel_mask = 0x739C739C;

284 sai->q_lo_pixel_mask = 0x0C630C63;

285 sai->bpp = 2;

286 break;

287 }

288

289 return 0;

290 }

291

292 static int config_output(AVFilterLink *outlink)

293 {

294 AVFilterLink *inlink = outlink->src->inputs[0];

295

296 outlink->w = inlink->w*2;

297 outlink->h = inlink->h*2;

298

299 av_log(inlink->dst, AV_LOG_VERBOSE, "fmt:%s size:%dx%d -> size:%dx%d\n",

300 av_get_pix_fmt_name(inlink->format),

301 inlink->w, inlink->h, outlink->w, outlink->h);

302

303 return 0;

304 }

305

306 static int filter_frame(AVFilterLink *inlink, AVFrame *inpicref)

307 {

308 AVFilterLink *outlink = inlink->dst->outputs[0];

309 AVFrame *outpicref = ff_get_video_buffer(outlink, outlink->w, outlink->h);

310 if (!outpicref) {

311 av_frame_free(&inpicref);

312 return AVERROR(ENOMEM);

313 }

314 av_frame_copy_props(outpicref, inpicref);

315 outpicref->width = outlink->w;

316 outpicref->height = outlink->h;

317

318 super2xsai(inlink->dst, inpicref->data[0], inpicref->linesize[0],

319 outpicref->data[0], outpicref->linesize[0],

320 inlink->w, inlink->h);

321

322 av_frame_free(&inpicref);

323 return ff_filter_frame(outlink, outpicref);

324 }

325

326 static const AVFilterPad super2xsai_inputs[] = {

327 {

328 .name = "default",

329 .type = AVMEDIA_TYPE_VIDEO,

330 .config_props = config_input,

331 .filter_frame = filter_frame,

332 },

333 { NULL }

334 };

335

336 static const AVFilterPad super2xsai_outputs[] = {

337 {

338 .name = "default",

339 .type = AVMEDIA_TYPE_VIDEO,

340 .config_props = config_output,

341 },

342 { NULL }

343 };

344

345 AVFilter avfilter_vf_super2xsai = {

346 .name = "super2xsai",

347 .description = NULL_IF_CONFIG_SMALL("Scale the input by 2x using the Super2xSaI pixel art algorithm."),

348 .priv_size = sizeof(Super2xSaIContext),

349 .query_formats = query_formats,

350 .inputs = super2xsai_inputs,

351 .outputs = super2xsai_outputs,

352 };

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