2 * Copyright (c) 2011 Stefano Sabatini
3 * Copyright (c) 2010 Baptiste Coudurier
4 * Copyright (c) 2003 Michael Zucchi <notzed@ximian.com>
6 * This file is part of FFmpeg.
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.
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.
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.
25 * temporal field interlace filter, ported from MPlayer/libmpcodecs
28 #include "libavutil/opt.h"
29 #include "libavutil/imgutils.h"
30 #include "libavutil/avassert.h"
33 #include "tinterlace.h"
35 #define OFFSET(x) offsetof(TInterlaceContext, x)
36 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
37 #define TINTERLACE_FLAG_VLPF 01
38 #define TINTERLACE_FLAG_EXACT_TB 2
40 static const AVOption tinterlace_options[] = {
41 {"mode", "select interlace mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=MODE_MERGE}, 0, MODE_NB-1, FLAGS, "mode"},
42 {"merge", "merge fields", 0, AV_OPT_TYPE_CONST, {.i64=MODE_MERGE}, INT_MIN, INT_MAX, FLAGS, "mode"},
43 {"drop_even", "drop even fields", 0, AV_OPT_TYPE_CONST, {.i64=MODE_DROP_EVEN}, INT_MIN, INT_MAX, FLAGS, "mode"},
44 {"drop_odd", "drop odd fields", 0, AV_OPT_TYPE_CONST, {.i64=MODE_DROP_ODD}, INT_MIN, INT_MAX, FLAGS, "mode"},
45 {"pad", "pad alternate lines with black", 0, AV_OPT_TYPE_CONST, {.i64=MODE_PAD}, INT_MIN, INT_MAX, FLAGS, "mode"},
46 {"interleave_top", "interleave top and bottom fields", 0, AV_OPT_TYPE_CONST, {.i64=MODE_INTERLEAVE_TOP}, INT_MIN, INT_MAX, FLAGS, "mode"},
47 {"interleave_bottom", "interleave bottom and top fields", 0, AV_OPT_TYPE_CONST, {.i64=MODE_INTERLEAVE_BOTTOM}, INT_MIN, INT_MAX, FLAGS, "mode"},
48 {"interlacex2", "interlace fields from two consecutive frames", 0, AV_OPT_TYPE_CONST, {.i64=MODE_INTERLACEX2}, INT_MIN, INT_MAX, FLAGS, "mode"},
50 {"flags", "set flags", OFFSET(flags), AV_OPT_TYPE_FLAGS, {.i64 = 0}, 0, INT_MAX, 0, "flags" },
51 {"low_pass_filter", "enable vertical low-pass filter", 0, AV_OPT_TYPE_CONST, {.i64 = TINTERLACE_FLAG_VLPF}, INT_MIN, INT_MAX, FLAGS, "flags" },
52 {"vlpf", "enable vertical low-pass filter", 0, AV_OPT_TYPE_CONST, {.i64 = TINTERLACE_FLAG_VLPF}, INT_MIN, INT_MAX, FLAGS, "flags" },
53 {"exact_tb", "force a timebase which can represent timestamps exactly", 0, AV_OPT_TYPE_CONST, {.i64 = TINTERLACE_FLAG_EXACT_TB}, INT_MIN, INT_MAX, FLAGS, "flags" },
58 AVFILTER_DEFINE_CLASS(tinterlace);
60 #define FULL_SCALE_YUVJ_FORMATS \
61 AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P
63 static const enum AVPixelFormat full_scale_yuvj_pix_fmts[] = {
64 FULL_SCALE_YUVJ_FORMATS, AV_PIX_FMT_NONE
67 static const AVRational standard_tbs[] = {
73 static int query_formats(AVFilterContext *ctx)
75 static const enum AVPixelFormat pix_fmts[] = {
76 AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV411P,
77 AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P,
78 AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUV444P,
79 AV_PIX_FMT_YUVA420P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA444P,
80 AV_PIX_FMT_GRAY8, FULL_SCALE_YUVJ_FORMATS,
84 AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts);
86 return AVERROR(ENOMEM);
87 return ff_set_common_formats(ctx, fmts_list);
90 static void lowpass_line_c(uint8_t *dstp, ptrdiff_t width, const uint8_t *srcp,
91 const uint8_t *srcp_above, const uint8_t *srcp_below)
94 for (i = 0; i < width; i++) {
95 // this calculation is an integer representation of
96 // '0.5 * current + 0.25 * above + 0.25 * below'
97 // '1 +' is for rounding.
98 dstp[i] = (1 + srcp[i] + srcp[i] + srcp_above[i] + srcp_below[i]) >> 2;
102 static av_cold void uninit(AVFilterContext *ctx)
104 TInterlaceContext *tinterlace = ctx->priv;
106 av_frame_free(&tinterlace->cur );
107 av_frame_free(&tinterlace->next);
108 av_freep(&tinterlace->black_data[0]);
111 static int config_out_props(AVFilterLink *outlink)
113 AVFilterContext *ctx = outlink->src;
114 AVFilterLink *inlink = outlink->src->inputs[0];
115 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(outlink->format);
116 TInterlaceContext *tinterlace = ctx->priv;
119 tinterlace->vsub = desc->log2_chroma_h;
120 outlink->w = inlink->w;
121 outlink->h = tinterlace->mode == MODE_MERGE || tinterlace->mode == MODE_PAD ?
122 inlink->h*2 : inlink->h;
123 if (tinterlace->mode == MODE_MERGE || tinterlace->mode == MODE_PAD)
124 outlink->sample_aspect_ratio = av_mul_q(inlink->sample_aspect_ratio,
127 if (tinterlace->mode == MODE_PAD) {
128 uint8_t black[4] = { 16, 128, 128, 16 };
130 if (ff_fmt_is_in(outlink->format, full_scale_yuvj_pix_fmts))
131 black[0] = black[3] = 0;
132 ret = av_image_alloc(tinterlace->black_data, tinterlace->black_linesize,
133 outlink->w, outlink->h, outlink->format, 1);
137 /* fill black picture with black */
138 for (i = 0; i < 4 && tinterlace->black_data[i]; i++) {
139 int h = i == 1 || i == 2 ? FF_CEIL_RSHIFT(outlink->h, desc->log2_chroma_h) : outlink->h;
140 memset(tinterlace->black_data[i], black[i],
141 tinterlace->black_linesize[i] * h);
144 if ((tinterlace->flags & TINTERLACE_FLAG_VLPF)
145 && !(tinterlace->mode == MODE_INTERLEAVE_TOP
146 || tinterlace->mode == MODE_INTERLEAVE_BOTTOM)) {
147 av_log(ctx, AV_LOG_WARNING, "low_pass_filter flag ignored with mode %d\n",
149 tinterlace->flags &= ~TINTERLACE_FLAG_VLPF;
151 tinterlace->preout_time_base = inlink->time_base;
152 if (tinterlace->mode == MODE_INTERLACEX2) {
153 tinterlace->preout_time_base.den *= 2;
154 outlink->frame_rate = av_mul_q(inlink->frame_rate, (AVRational){2,1});
155 outlink->time_base = av_mul_q(inlink->time_base , (AVRational){1,2});
156 } else if (tinterlace->mode != MODE_PAD) {
157 outlink->frame_rate = av_mul_q(inlink->frame_rate, (AVRational){1,2});
158 outlink->time_base = av_mul_q(inlink->time_base , (AVRational){2,1});
161 for (i = 0; i<FF_ARRAY_ELEMS(standard_tbs); i++){
162 if (!av_cmp_q(standard_tbs[i], outlink->time_base))
165 if (i == FF_ARRAY_ELEMS(standard_tbs) ||
166 (tinterlace->flags & TINTERLACE_FLAG_EXACT_TB))
167 outlink->time_base = tinterlace->preout_time_base;
169 if (tinterlace->flags & TINTERLACE_FLAG_VLPF) {
170 tinterlace->lowpass_line = lowpass_line_c;
172 ff_tinterlace_init_x86(tinterlace);
175 av_log(ctx, AV_LOG_VERBOSE, "mode:%d filter:%s h:%d -> h:%d\n",
176 tinterlace->mode, (tinterlace->flags & TINTERLACE_FLAG_VLPF) ? "on" : "off",
177 inlink->h, outlink->h);
182 #define FIELD_UPPER 0
183 #define FIELD_LOWER 1
184 #define FIELD_UPPER_AND_LOWER 2
187 * Copy picture field from src to dst.
189 * @param src_field copy from upper, lower field or both
190 * @param interleave leave a padding line between each copied line
191 * @param dst_field copy to upper or lower field,
192 * only meaningful when interleave is selected
193 * @param flags context flags
196 void copy_picture_field(TInterlaceContext *tinterlace,
197 uint8_t *dst[4], int dst_linesize[4],
198 const uint8_t *src[4], int src_linesize[4],
199 enum AVPixelFormat format, int w, int src_h,
200 int src_field, int interleave, int dst_field,
203 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(format);
204 int hsub = desc->log2_chroma_w;
205 int plane, vsub = desc->log2_chroma_h;
206 int k = src_field == FIELD_UPPER_AND_LOWER ? 1 : 2;
209 for (plane = 0; plane < desc->nb_components; plane++) {
210 int lines = plane == 1 || plane == 2 ? FF_CEIL_RSHIFT(src_h, vsub) : src_h;
211 int cols = plane == 1 || plane == 2 ? FF_CEIL_RSHIFT( w, hsub) : w;
212 uint8_t *dstp = dst[plane];
213 const uint8_t *srcp = src[plane];
215 lines = (lines + (src_field == FIELD_UPPER)) / k;
216 if (src_field == FIELD_LOWER)
217 srcp += src_linesize[plane];
218 if (interleave && dst_field == FIELD_LOWER)
219 dstp += dst_linesize[plane];
220 if (flags & TINTERLACE_FLAG_VLPF) {
221 // Low-pass filtering is required when creating an interlaced destination from
222 // a progressive source which contains high-frequency vertical detail.
223 // Filtering will reduce interlace 'twitter' and Moire patterning.
224 int srcp_linesize = src_linesize[plane] * k;
225 int dstp_linesize = dst_linesize[plane] * (interleave ? 2 : 1);
226 for (h = lines; h > 0; h--) {
227 const uint8_t *srcp_above = srcp - src_linesize[plane];
228 const uint8_t *srcp_below = srcp + src_linesize[plane];
229 if (h == lines) srcp_above = srcp; // there is no line above
230 if (h == 1) srcp_below = srcp; // there is no line below
232 tinterlace->lowpass_line(dstp, cols, srcp, srcp_above, srcp_below);
233 dstp += dstp_linesize;
234 srcp += srcp_linesize;
237 av_image_copy_plane(dstp, dst_linesize[plane] * (interleave ? 2 : 1),
238 srcp, src_linesize[plane]*k, cols, lines);
243 static int filter_frame(AVFilterLink *inlink, AVFrame *picref)
245 AVFilterContext *ctx = inlink->dst;
246 AVFilterLink *outlink = ctx->outputs[0];
247 TInterlaceContext *tinterlace = ctx->priv;
248 AVFrame *cur, *next, *out;
251 av_frame_free(&tinterlace->cur);
252 tinterlace->cur = tinterlace->next;
253 tinterlace->next = picref;
255 cur = tinterlace->cur;
256 next = tinterlace->next;
257 /* we need at least two frames */
258 if (!tinterlace->cur)
261 switch (tinterlace->mode) {
262 case MODE_MERGE: /* move the odd frame into the upper field of the new image, even into
263 * the lower field, generating a double-height video at half framerate */
264 out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
266 return AVERROR(ENOMEM);
267 av_frame_copy_props(out, cur);
268 out->height = outlink->h;
269 out->interlaced_frame = 1;
270 out->top_field_first = 1;
271 out->sample_aspect_ratio = av_mul_q(cur->sample_aspect_ratio, av_make_q(2, 1));
273 /* write odd frame lines into the upper field of the new frame */
274 copy_picture_field(tinterlace, out->data, out->linesize,
275 (const uint8_t **)cur->data, cur->linesize,
276 inlink->format, inlink->w, inlink->h,
277 FIELD_UPPER_AND_LOWER, 1, FIELD_UPPER, tinterlace->flags);
278 /* write even frame lines into the lower field of the new frame */
279 copy_picture_field(tinterlace, out->data, out->linesize,
280 (const uint8_t **)next->data, next->linesize,
281 inlink->format, inlink->w, inlink->h,
282 FIELD_UPPER_AND_LOWER, 1, FIELD_LOWER, tinterlace->flags);
283 av_frame_free(&tinterlace->next);
286 case MODE_DROP_ODD: /* only output even frames, odd frames are dropped; height unchanged, half framerate */
287 case MODE_DROP_EVEN: /* only output odd frames, even frames are dropped; height unchanged, half framerate */
288 out = av_frame_clone(tinterlace->mode == MODE_DROP_EVEN ? cur : next);
290 return AVERROR(ENOMEM);
291 av_frame_free(&tinterlace->next);
294 case MODE_PAD: /* expand each frame to double height, but pad alternate
295 * lines with black; framerate unchanged */
296 out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
298 return AVERROR(ENOMEM);
299 av_frame_copy_props(out, cur);
300 out->height = outlink->h;
301 out->sample_aspect_ratio = av_mul_q(cur->sample_aspect_ratio, av_make_q(2, 1));
303 field = (1 + tinterlace->frame) & 1 ? FIELD_UPPER : FIELD_LOWER;
304 /* copy upper and lower fields */
305 copy_picture_field(tinterlace, out->data, out->linesize,
306 (const uint8_t **)cur->data, cur->linesize,
307 inlink->format, inlink->w, inlink->h,
308 FIELD_UPPER_AND_LOWER, 1, field, tinterlace->flags);
309 /* pad with black the other field */
310 copy_picture_field(tinterlace, out->data, out->linesize,
311 (const uint8_t **)tinterlace->black_data, tinterlace->black_linesize,
312 inlink->format, inlink->w, inlink->h,
313 FIELD_UPPER_AND_LOWER, 1, !field, tinterlace->flags);
316 /* interleave upper/lower lines from odd frames with lower/upper lines from even frames,
317 * halving the frame rate and preserving image height */
318 case MODE_INTERLEAVE_TOP: /* top field first */
319 case MODE_INTERLEAVE_BOTTOM: /* bottom field first */
320 tff = tinterlace->mode == MODE_INTERLEAVE_TOP;
321 out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
323 return AVERROR(ENOMEM);
324 av_frame_copy_props(out, cur);
325 out->interlaced_frame = 1;
326 out->top_field_first = tff;
328 /* copy upper/lower field from cur */
329 copy_picture_field(tinterlace, out->data, out->linesize,
330 (const uint8_t **)cur->data, cur->linesize,
331 inlink->format, inlink->w, inlink->h,
332 tff ? FIELD_UPPER : FIELD_LOWER, 1, tff ? FIELD_UPPER : FIELD_LOWER,
334 /* copy lower/upper field from next */
335 copy_picture_field(tinterlace, out->data, out->linesize,
336 (const uint8_t **)next->data, next->linesize,
337 inlink->format, inlink->w, inlink->h,
338 tff ? FIELD_LOWER : FIELD_UPPER, 1, tff ? FIELD_LOWER : FIELD_UPPER,
340 av_frame_free(&tinterlace->next);
342 case MODE_INTERLACEX2: /* re-interlace preserving image height, double frame rate */
343 /* output current frame first */
344 out = av_frame_clone(cur);
346 return AVERROR(ENOMEM);
347 out->interlaced_frame = 1;
348 if (cur->pts != AV_NOPTS_VALUE)
349 out->pts = cur->pts*2;
351 out->pts = av_rescale_q(out->pts, tinterlace->preout_time_base, outlink->time_base);
352 if ((ret = ff_filter_frame(outlink, out)) < 0)
355 /* output mix of current and next frame */
356 tff = next->top_field_first;
357 out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
359 return AVERROR(ENOMEM);
360 av_frame_copy_props(out, next);
361 out->interlaced_frame = 1;
362 out->top_field_first = !tff;
364 if (next->pts != AV_NOPTS_VALUE && cur->pts != AV_NOPTS_VALUE)
365 out->pts = cur->pts + next->pts;
367 out->pts = AV_NOPTS_VALUE;
368 /* write current frame second field lines into the second field of the new frame */
369 copy_picture_field(tinterlace, out->data, out->linesize,
370 (const uint8_t **)cur->data, cur->linesize,
371 inlink->format, inlink->w, inlink->h,
372 tff ? FIELD_LOWER : FIELD_UPPER, 1, tff ? FIELD_LOWER : FIELD_UPPER,
374 /* write next frame first field lines into the first field of the new frame */
375 copy_picture_field(tinterlace, out->data, out->linesize,
376 (const uint8_t **)next->data, next->linesize,
377 inlink->format, inlink->w, inlink->h,
378 tff ? FIELD_UPPER : FIELD_LOWER, 1, tff ? FIELD_UPPER : FIELD_LOWER,
385 out->pts = av_rescale_q(out->pts, tinterlace->preout_time_base, outlink->time_base);
386 ret = ff_filter_frame(outlink, out);
392 static const AVFilterPad tinterlace_inputs[] = {
395 .type = AVMEDIA_TYPE_VIDEO,
396 .filter_frame = filter_frame,
401 static const AVFilterPad tinterlace_outputs[] = {
404 .type = AVMEDIA_TYPE_VIDEO,
405 .config_props = config_out_props,
410 AVFilter ff_vf_tinterlace = {
411 .name = "tinterlace",
412 .description = NULL_IF_CONFIG_SMALL("Perform temporal field interlacing."),
413 .priv_size = sizeof(TInterlaceContext),
415 .query_formats = query_formats,
416 .inputs = tinterlace_inputs,
417 .outputs = tinterlace_outputs,
418 .priv_class = &tinterlace_class,