FFmpeg: libavfilter/vf_w3fdif.c Source File

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libavfilter

vf_w3fdif.c

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1 /*

3 * Author of de-interlace algorithm: Jim Easterbrook for BBC R&D

4 * Based on the process described by Martin Weston for BBC R&D

5 * Author of FFmpeg filter: Mark Himsley for BBC Broadcast Systems Development

6 *

7 * This file is part of FFmpeg.

8 *

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

10 * modify it under the terms of the GNU Lesser General Public

11 * License as published by the Free Software Foundation; either

12 * version 2.1 of the License, or (at your option) any later version.

13 *

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

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

16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

17 * Lesser General Public License for more details.

18 *

19 * You should have received a copy of the GNU Lesser General Public

20 * License along with FFmpeg; if not, write to the Free Software

21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

22 */

24 #include "libavutil/common.h"

25 #include "libavutil/imgutils.h"

26 #include "libavutil/opt.h"

27 #include "libavutil/pixdesc.h"

28 #include "avfilter.h"

29 #include "formats.h"

30 #include "internal.h"

31 #include "video.h"

33 typedef struct W3FDIFContext {

34 const AVClass *class;

35 int filter; ///< 0 is simple, 1 is more complex

36 int deint; ///< which frames to deinterlace

37 int linesize[4]; ///< bytes of pixel data per line for each plane

38 int planeheight[4]; ///< height of each plane

39 int field; ///< which field are we on, 0 or 1

40 int eof;

41 int nb_planes;

42 AVFrame *prev, *cur, *next; ///< previous, current, next frames

43 int32_t *work_line; ///< line we are calculating

44 } W3FDIFContext;

46 #define OFFSET(x) offsetof(W3FDIFContext, x)

47 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM

48 #define CONST(name, help, val, unit) { name, help, 0, AV_OPT_TYPE_CONST, {.i64=val}, 0, 0, FLAGS, unit }

50 static const AVOption w3fdif_options[] = {

51 { "filter", "specify the filter", OFFSET(filter), AV_OPT_TYPE_INT, {.i64=1}, 0, 1, FLAGS, "filter" },

52 CONST("simple", NULL, 0, "filter"),

53 CONST("complex", NULL, 1, "filter"),

54 { "deint", "specify which frames to deinterlace", OFFSET(deint), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS, "deint" },

55 CONST("all", "deinterlace all frames", 0, "deint"),

56 CONST("interlaced", "only deinterlace frames marked as interlaced", 1, "deint"),

57 { NULL }

58 };

60 AVFILTER_DEFINE_CLASS(w3fdif);

62 static int query_formats(AVFilterContext *ctx)

63 {

64 static const enum AVPixelFormat pix_fmts[] = {

65 AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV411P,

66 AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P,

67 AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUV444P,

68 AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P,

69 AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ420P,

70 AV_PIX_FMT_YUVJ411P,

71 AV_PIX_FMT_YUVA420P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA444P,

72 AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRAP,

73 AV_PIX_FMT_GRAY8,

74 AV_PIX_FMT_NONE

75 };

77 ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));

79 return 0;

80 }

82 static int config_input(AVFilterLink *inlink)

83 {

84 W3FDIFContext *s = inlink->dst->priv;

85 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);

86 int ret;

88 if ((ret = av_image_fill_linesizes(s->linesize, inlink->format, inlink->w)) < 0)

89 return ret;

91 s->planeheight[1] = s->planeheight[2] = FF_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h);

92 s->planeheight[0] = s->planeheight[3] = inlink->h;

94 s->nb_planes = av_pix_fmt_count_planes(inlink->format);

95 s->work_line = av_calloc(s->linesize[0], sizeof(*s->work_line));

96 if (!s->work_line)

97 return AVERROR(ENOMEM);

99 return 0;

100 }

101

102 static int config_output(AVFilterLink *outlink)

103 {

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

105

106 outlink->time_base.num = inlink->time_base.num;

107 outlink->time_base.den = inlink->time_base.den * 2;

108 outlink->frame_rate.num = inlink->frame_rate.num * 2;

109 outlink->frame_rate.den = inlink->frame_rate.den;

110 outlink->flags |= FF_LINK_FLAG_REQUEST_LOOP;

111

112 return 0;

113 }

114

115 /*

116 * Filter coefficients from PH-2071, scaled by 256 * 256.

117 * Each set of coefficients has a set for low-frequencies and high-frequencies.

118 * n_coef_lf[] and n_coef_hf[] are the number of coefs for simple and more-complex.

119 * It is important for later that n_coef_lf[] is even and n_coef_hf[] is odd.

120 * coef_lf[][] and coef_hf[][] are the coefficients for low-frequencies

121 * and high-frequencies for simple and more-complex mode.

122 */

123 static const int8_t n_coef_lf[2] = { 2, 4 };

124 static const int32_t coef_lf[2][4] = {{ 32768, 32768, 0, 0},

125 { -1704, 34472, 34472, -1704}};

126 static const int8_t n_coef_hf[2] = { 3, 5 };

127 static const int32_t coef_hf[2][5] = {{ -4096, 8192, -4096, 0, 0},

128 { 2032, -7602, 11140, -7602, 2032}};

129

130 static void deinterlace_plane(AVFilterContext *ctx, AVFrame *out,

131 const AVFrame *cur, const AVFrame *adj,

132 const int filter, const int plane)

133 {

134 W3FDIFContext *s = ctx->priv;

135 uint8_t *in_line, *in_lines_cur[5], *in_lines_adj[5];

136 uint8_t *out_line, *out_pixel;

137 int32_t *work_line, *work_pixel;

138 uint8_t *cur_data = cur->data[plane];

139 uint8_t *adj_data = adj->data[plane];

140 uint8_t *dst_data = out->data[plane];

141 const int linesize = s->linesize[plane];

142 const int height = s->planeheight[plane];

143 const int cur_line_stride = cur->linesize[plane];

144 const int adj_line_stride = adj->linesize[plane];

145 const int dst_line_stride = out->linesize[plane];

146 int i, j, y_in, y_out;

147

148 /* copy unchanged the lines of the field */

149 y_out = s->field == cur->top_field_first;

150

151 in_line = cur_data + (y_out * cur_line_stride);

152 out_line = dst_data + (y_out * dst_line_stride);

153

154 while (y_out < height) {

155 memcpy(out_line, in_line, linesize);

156 y_out += 2;

157 in_line += cur_line_stride * 2;

158 out_line += dst_line_stride * 2;

159 }

160

161 /* interpolate other lines of the field */

162 y_out = s->field != cur->top_field_first;

163

164 out_line = dst_data + (y_out * dst_line_stride);

165

166 while (y_out < height) {

167 /* clear workspace */

168 memset(s->work_line, 0, sizeof(*s->work_line) * linesize);

169

170 /* get low vertical frequencies from current field */

171 for (j = 0; j < n_coef_lf[filter]; j++) {

172 y_in = (y_out + 1) + (j * 2) - n_coef_lf[filter];

173

174 while (y_in < 0)

175 y_in += 2;

176 while (y_in >= height)

177 y_in -= 2;

178

179 in_lines_cur[j] = cur_data + (y_in * cur_line_stride);

180 }

181

182 work_line = s->work_line;

183 switch (n_coef_lf[filter]) {

184 case 2:

185 for (i = 0; i < linesize; i++) {

186 *work_line += *in_lines_cur[0]++ * coef_lf[filter][0];

187 *work_line++ += *in_lines_cur[1]++ * coef_lf[filter][1];

188 }

189 break;

190 case 4:

191 for (i = 0; i < linesize; i++) {

192 *work_line += *in_lines_cur[0]++ * coef_lf[filter][0];

193 *work_line += *in_lines_cur[1]++ * coef_lf[filter][1];

194 *work_line += *in_lines_cur[2]++ * coef_lf[filter][2];

195 *work_line++ += *in_lines_cur[3]++ * coef_lf[filter][3];

196 }

197 }

198

199 /* get high vertical frequencies from adjacent fields */

200 for (j = 0; j < n_coef_hf[filter]; j++) {

201 y_in = (y_out + 1) + (j * 2) - n_coef_hf[filter];

202

203 while (y_in < 0)

204 y_in += 2;

205 while (y_in >= height)

206 y_in -= 2;

207

208 in_lines_cur[j] = cur_data + (y_in * cur_line_stride);

209 in_lines_adj[j] = adj_data + (y_in * adj_line_stride);

210 }

211

212 work_line = s->work_line;

213 switch (n_coef_hf[filter]) {

214 case 3:

215 for (i = 0; i < linesize; i++) {

216 *work_line += *in_lines_cur[0]++ * coef_hf[filter][0];

217 *work_line += *in_lines_adj[0]++ * coef_hf[filter][0];

218 *work_line += *in_lines_cur[1]++ * coef_hf[filter][1];

219 *work_line += *in_lines_adj[1]++ * coef_hf[filter][1];

220 *work_line += *in_lines_cur[2]++ * coef_hf[filter][2];

221 *work_line++ += *in_lines_adj[2]++ * coef_hf[filter][2];

222 }

223 break;

224 case 5:

225 for (i = 0; i < linesize; i++) {

226 *work_line += *in_lines_cur[0]++ * coef_hf[filter][0];

227 *work_line += *in_lines_adj[0]++ * coef_hf[filter][0];

228 *work_line += *in_lines_cur[1]++ * coef_hf[filter][1];

229 *work_line += *in_lines_adj[1]++ * coef_hf[filter][1];

230 *work_line += *in_lines_cur[2]++ * coef_hf[filter][2];

231 *work_line += *in_lines_adj[2]++ * coef_hf[filter][2];

232 *work_line += *in_lines_cur[3]++ * coef_hf[filter][3];

233 *work_line += *in_lines_adj[3]++ * coef_hf[filter][3];

234 *work_line += *in_lines_cur[4]++ * coef_hf[filter][4];

235 *work_line++ += *in_lines_adj[4]++ * coef_hf[filter][4];

236 }

237 }

238

239 /* save scaled result to the output frame, scaling down by 256 * 256 */

240 work_pixel = s->work_line;

241 out_pixel = out_line;

242

243 for (j = 0; j < linesize; j++, out_pixel++, work_pixel++)

244 *out_pixel = av_clip(*work_pixel, 0, 255 * 256 * 256) >> 16;

245

246 /* move on to next line */

247 y_out += 2;

248 out_line += dst_line_stride * 2;

249 }

250 }

251

252 static int filter(AVFilterContext *ctx, int is_second)

253 {

254 W3FDIFContext *s = ctx->priv;

255 AVFilterLink *outlink = ctx->outputs[0];

256 AVFrame *out, *adj;

257 int plane;

258

259 out = ff_get_video_buffer(outlink, outlink->w, outlink->h);

260 if (!out)

261 return AVERROR(ENOMEM);

262 av_frame_copy_props(out, s->cur);

263 out->interlaced_frame = 0;

264

265 if (!is_second) {

266 if (out->pts != AV_NOPTS_VALUE)

267 out->pts *= 2;

268 } else {

269 int64_t cur_pts = s->cur->pts;

270 int64_t next_pts = s->next->pts;

271

272 if (next_pts != AV_NOPTS_VALUE && cur_pts != AV_NOPTS_VALUE) {

273 out->pts = cur_pts + next_pts;

274 } else {

275 out->pts = AV_NOPTS_VALUE;

276 }

277 }

278

279 adj = s->field ? s->next : s->prev;

280 for (plane = 0; plane < s->nb_planes; plane++)

281 deinterlace_plane(ctx, out, s->cur, adj, s->filter, plane);

282

283 s->field = !s->field;

284

285 return ff_filter_frame(outlink, out);

286 }

287

288 static int filter_frame(AVFilterLink *inlink, AVFrame *frame)

289 {

290 AVFilterContext *ctx = inlink->dst;

291 W3FDIFContext *s = ctx->priv;

292 int ret;

293

294 av_frame_free(&s->prev);

295 s->prev = s->cur;

296 s->cur = s->next;

297 s->next = frame;

298

299 if (!s->cur) {

300 s->cur = av_frame_clone(s->next);

301 if (!s->cur)

302 return AVERROR(ENOMEM);

303 }

304

305 if ((s->deint && !s->cur->interlaced_frame) || ctx->is_disabled) {

306 AVFrame *out = av_frame_clone(s->cur);

307 if (!out)

308 return AVERROR(ENOMEM);

309

310 av_frame_free(&s->prev);

311 if (out->pts != AV_NOPTS_VALUE)

312 out->pts *= 2;

313 return ff_filter_frame(ctx->outputs[0], out);

314 }

315

316 if (!s->prev)

317 return 0;

318

319 ret = filter(ctx, 0);

320 if (ret < 0)

321 return ret;

322

323 return filter(ctx, 1);

324 }

325

326 static int request_frame(AVFilterLink *outlink)

327 {

328 AVFilterContext *ctx = outlink->src;

329 W3FDIFContext *s = ctx->priv;

330

331 do {

332 int ret;

333

334 if (s->eof)

335 return AVERROR_EOF;

336

337 ret = ff_request_frame(ctx->inputs[0]);

338

339 if (ret == AVERROR_EOF && s->cur) {

340 AVFrame *next = av_frame_clone(s->next);

341 if (!next)

342 return AVERROR(ENOMEM);

343 next->pts = s->next->pts * 2 - s->cur->pts;

344 filter_frame(ctx->inputs[0], next);

345 s->eof = 1;

346 } else if (ret < 0) {

347 return ret;

348 }

349 } while (!s->cur);

350

351 return 0;

352 }

353

354 static av_cold void uninit(AVFilterContext *ctx)

355 {

356 W3FDIFContext *s = ctx->priv;

357

358 av_frame_free(&s->prev);

359 av_frame_free(&s->cur );

360 av_frame_free(&s->next);

361 av_freep(&s->work_line);

362 }

363

364 static const AVFilterPad w3fdif_inputs[] = {

365 {

366 .name = "default",

367 .type = AVMEDIA_TYPE_VIDEO,

368 .filter_frame = filter_frame,

369 .config_props = config_input,

370 },

371 { NULL }

372 };

373

374 static const AVFilterPad w3fdif_outputs[] = {

375 {

376 .name = "default",

377 .type = AVMEDIA_TYPE_VIDEO,

378 .config_props = config_output,

379 .request_frame = request_frame,

380 },

381 { NULL }

382 };

383

384 AVFilter ff_vf_w3fdif = {

385 .name = "w3fdif",

386 .description = NULL_IF_CONFIG_SMALL("Apply Martin Weston three field deinterlace."),

387 .priv_size = sizeof(W3FDIFContext),

388 .priv_class = &w3fdif_class,

389 .uninit = uninit,

390 .query_formats = query_formats,

391 .inputs = w3fdif_inputs,

392 .outputs = w3fdif_outputs,

393 .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL,

394 };

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