1 /*
2 * Copyright (c) 2017 Thomas Mundt <tmundt75@gmail.com>
3 * Copyright (c) 2011 Stefano Sabatini
4 * Copyright (c) 2010 Baptiste Coudurier
5 * Copyright (c) 2003 Michael Zucchi <notzed@ximian.com>
6 *
7 * This file is part of FFmpeg.
8 *
9 * FFmpeg is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (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
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License along
20 * with FFmpeg if not, write to the Free Software Foundation, Inc.,
21 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
22 */
23
24 /**
25 * @file
26 * temporal field interlace filter, ported from MPlayer/libmpcodecs
27 */
28
29 #include "libavutil/opt.h"
30 #include "libavutil/imgutils.h"
31 #include "libavutil/avassert.h"
32 #include "avfilter.h"
33 #include "internal.h"
34 #include "tinterlace.h"
35
36 #define OFFSET(x) offsetof(TInterlaceContext, x)
37 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
38
39 static const AVOption tinterlace_options[] = {
40 {"mode", "select interlace mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=MODE_MERGE}, 0, MODE_NB-1, FLAGS, "mode"},
41 {"merge", "merge fields", 0, AV_OPT_TYPE_CONST, {.i64=MODE_MERGE}, INT_MIN, INT_MAX, FLAGS, "mode"},
42 {"drop_even", "drop even fields", 0, AV_OPT_TYPE_CONST, {.i64=MODE_DROP_EVEN}, INT_MIN, INT_MAX, FLAGS, "mode"},
43 {"drop_odd", "drop odd fields", 0, AV_OPT_TYPE_CONST, {.i64=MODE_DROP_ODD}, INT_MIN, INT_MAX, FLAGS, "mode"},
44 {"pad", "pad alternate lines with black", 0, AV_OPT_TYPE_CONST, {.i64=MODE_PAD}, INT_MIN, INT_MAX, FLAGS, "mode"},
45 {"interleave_top", "interleave top and bottom fields", 0, AV_OPT_TYPE_CONST, {.i64=MODE_INTERLEAVE_TOP}, INT_MIN, INT_MAX, FLAGS, "mode"},
46 {"interleave_bottom", "interleave bottom and top fields", 0, AV_OPT_TYPE_CONST, {.i64=MODE_INTERLEAVE_BOTTOM}, INT_MIN, INT_MAX, FLAGS, "mode"},
47 {"interlacex2", "interlace fields from two consecutive frames", 0, AV_OPT_TYPE_CONST, {.i64=MODE_INTERLACEX2}, INT_MIN, INT_MAX, FLAGS, "mode"},
48 {"mergex2", "merge fields keeping same frame rate", 0, AV_OPT_TYPE_CONST, {.i64=MODE_MERGEX2}, INT_MIN, INT_MAX, FLAGS, "mode"},
49
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 {"complex_filter", "enable complex vertical low-pass filter", 0, AV_OPT_TYPE_CONST, {.i64 = TINTERLACE_FLAG_CVLPF},INT_MIN, INT_MAX, FLAGS, "flags" },
54 {"cvlpf", "enable complex vertical low-pass filter", 0, AV_OPT_TYPE_CONST, {.i64 = TINTERLACE_FLAG_CVLPF},INT_MIN, INT_MAX, FLAGS, "flags" },
55 {"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" },
56 {"bypass_il", "bypass already interlaced frames", 0, AV_OPT_TYPE_CONST, {.i64 = TINTERLACE_FLAG_BYPASS_IL}, INT_MIN, INT_MAX, FLAGS, "flags" },
57
58 {NULL}
59 };
60
61 AVFILTER_DEFINE_CLASS(tinterlace);
62
63 static const AVOption interlace_options[] = {
64 { "scan", "scanning mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64 = MODE_TFF}, 0, 1, FLAGS, "mode"},
65 { "tff", "top field first", 0, AV_OPT_TYPE_CONST, {.i64 = MODE_TFF}, INT_MIN, INT_MAX, FLAGS, .unit = "mode"},
66 { "bff", "bottom field first", 0, AV_OPT_TYPE_CONST, {.i64 = MODE_BFF}, INT_MIN, INT_MAX, FLAGS, .unit = "mode"},
67 { "lowpass", "set vertical low-pass filter", OFFSET(lowpass), AV_OPT_TYPE_INT, {.i64 = VLPF_LIN}, 0, 2, FLAGS, "lowpass" },
68 { "off", "disable vertical low-pass filter", 0, AV_OPT_TYPE_CONST, {.i64 = VLPF_OFF}, INT_MIN, INT_MAX, FLAGS, "lowpass" },
69 { "linear", "linear vertical low-pass filter", 0, AV_OPT_TYPE_CONST, {.i64 = VLPF_LIN}, INT_MIN, INT_MAX, FLAGS, "lowpass" },
70 { "complex", "complex vertical low-pass filter", 0, AV_OPT_TYPE_CONST, {.i64 = VLPF_CMP}, INT_MIN, INT_MAX, FLAGS, "lowpass" },
71
72 { NULL }
73 };
74
75 AVFILTER_DEFINE_CLASS(interlace);
76
77 #define FULL_SCALE_YUVJ_FORMATS \
78 AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P
79
80 static const enum AVPixelFormat full_scale_yuvj_pix_fmts[] = {
81 FULL_SCALE_YUVJ_FORMATS, AV_PIX_FMT_NONE
82 };
83
84 static const AVRational standard_tbs[] = {
85 {1, 25},
86 {1, 30},
87 {1001, 30000},
88 };
89
query_formats(AVFilterContext * ctx)90 static int query_formats(AVFilterContext *ctx)
91 {
92 static const enum AVPixelFormat pix_fmts[] = {
93 AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV411P,
94 AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P,
95 AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUV444P,
96 AV_PIX_FMT_YUV420P10LE, AV_PIX_FMT_YUV422P10LE,
97 AV_PIX_FMT_YUV440P10LE, AV_PIX_FMT_YUV444P10LE,
98 AV_PIX_FMT_YUV420P12LE, AV_PIX_FMT_YUV422P12LE,
99 AV_PIX_FMT_YUV440P12LE, AV_PIX_FMT_YUV444P12LE,
100 AV_PIX_FMT_YUVA420P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA444P,
101 AV_PIX_FMT_YUVA420P10LE, AV_PIX_FMT_YUVA422P10LE, AV_PIX_FMT_YUVA444P10LE,
102 AV_PIX_FMT_GRAY8, FULL_SCALE_YUVJ_FORMATS,
103 AV_PIX_FMT_NONE
104 };
105
106 AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts);
107 if (!fmts_list)
108 return AVERROR(ENOMEM);
109 return ff_set_common_formats(ctx, fmts_list);
110 }
111
lowpass_line_c(uint8_t * dstp,ptrdiff_t width,const uint8_t * srcp,ptrdiff_t mref,ptrdiff_t pref,int clip_max)112 static void lowpass_line_c(uint8_t *dstp, ptrdiff_t width, const uint8_t *srcp,
113 ptrdiff_t mref, ptrdiff_t pref, int clip_max)
114 {
115 const uint8_t *srcp_above = srcp + mref;
116 const uint8_t *srcp_below = srcp + pref;
117 int i;
118 for (i = 0; i < width; i++) {
119 // this calculation is an integer representation of
120 // '0.5 * current + 0.25 * above + 0.25 * below'
121 // '1 +' is for rounding.
122 dstp[i] = (1 + srcp[i] + srcp[i] + srcp_above[i] + srcp_below[i]) >> 2;
123 }
124 }
125
lowpass_line_c_16(uint8_t * dst8,ptrdiff_t width,const uint8_t * src8,ptrdiff_t mref,ptrdiff_t pref,int clip_max)126 static void lowpass_line_c_16(uint8_t *dst8, ptrdiff_t width, const uint8_t *src8,
127 ptrdiff_t mref, ptrdiff_t pref, int clip_max)
128 {
129 uint16_t *dstp = (uint16_t *)dst8;
130 const uint16_t *srcp = (const uint16_t *)src8;
131 const uint16_t *srcp_above = srcp + mref / 2;
132 const uint16_t *srcp_below = srcp + pref / 2;
133 int i, src_x;
134 for (i = 0; i < width; i++) {
135 // this calculation is an integer representation of
136 // '0.5 * current + 0.25 * above + 0.25 * below'
137 // '1 +' is for rounding.
138 src_x = av_le2ne16(srcp[i]) << 1;
139 dstp[i] = av_le2ne16((1 + src_x + av_le2ne16(srcp_above[i])
140 + av_le2ne16(srcp_below[i])) >> 2);
141 }
142 }
143
lowpass_line_complex_c(uint8_t * dstp,ptrdiff_t width,const uint8_t * srcp,ptrdiff_t mref,ptrdiff_t pref,int clip_max)144 static void lowpass_line_complex_c(uint8_t *dstp, ptrdiff_t width, const uint8_t *srcp,
145 ptrdiff_t mref, ptrdiff_t pref, int clip_max)
146 {
147 const uint8_t *srcp_above = srcp + mref;
148 const uint8_t *srcp_below = srcp + pref;
149 const uint8_t *srcp_above2 = srcp + mref * 2;
150 const uint8_t *srcp_below2 = srcp + pref * 2;
151 int i, src_x, src_ab;
152 for (i = 0; i < width; i++) {
153 // this calculation is an integer representation of
154 // '0.75 * current + 0.25 * above + 0.25 * below - 0.125 * above2 - 0.125 * below2'
155 // '4 +' is for rounding.
156 src_x = srcp[i] << 1;
157 src_ab = srcp_above[i] + srcp_below[i];
158 dstp[i] = av_clip_uint8((4 + ((srcp[i] + src_x + src_ab) << 1)
159 - srcp_above2[i] - srcp_below2[i]) >> 3);
160 // Prevent over-sharpening:
161 // dst must not exceed src when the average of above and below
162 // is less than src. And the other way around.
163 if (src_ab > src_x) {
164 if (dstp[i] < srcp[i])
165 dstp[i] = srcp[i];
166 } else if (dstp[i] > srcp[i])
167 dstp[i] = srcp[i];
168 }
169 }
170
lowpass_line_complex_c_16(uint8_t * dst8,ptrdiff_t width,const uint8_t * src8,ptrdiff_t mref,ptrdiff_t pref,int clip_max)171 static void lowpass_line_complex_c_16(uint8_t *dst8, ptrdiff_t width, const uint8_t *src8,
172 ptrdiff_t mref, ptrdiff_t pref, int clip_max)
173 {
174 uint16_t *dstp = (uint16_t *)dst8;
175 const uint16_t *srcp = (const uint16_t *)src8;
176 const uint16_t *srcp_above = srcp + mref / 2;
177 const uint16_t *srcp_below = srcp + pref / 2;
178 const uint16_t *srcp_above2 = srcp + mref;
179 const uint16_t *srcp_below2 = srcp + pref;
180 int i, dst_le, src_le, src_x, src_ab;
181 for (i = 0; i < width; i++) {
182 // this calculation is an integer representation of
183 // '0.75 * current + 0.25 * above + 0.25 * below - 0.125 * above2 - 0.125 * below2'
184 // '4 +' is for rounding.
185 src_le = av_le2ne16(srcp[i]);
186 src_x = src_le << 1;
187 src_ab = av_le2ne16(srcp_above[i]) + av_le2ne16(srcp_below[i]);
188 dst_le = av_clip((4 + ((src_le + src_x + src_ab) << 1)
189 - av_le2ne16(srcp_above2[i])
190 - av_le2ne16(srcp_below2[i])) >> 3, 0, clip_max);
191 // Prevent over-sharpening:
192 // dst must not exceed src when the average of above and below
193 // is less than src. And the other way around.
194 if (src_ab > src_x) {
195 if (dst_le < src_le)
196 dstp[i] = av_le2ne16(src_le);
197 else
198 dstp[i] = av_le2ne16(dst_le);
199 } else if (dst_le > src_le) {
200 dstp[i] = av_le2ne16(src_le);
201 } else
202 dstp[i] = av_le2ne16(dst_le);
203 }
204 }
205
uninit(AVFilterContext * ctx)206 static av_cold void uninit(AVFilterContext *ctx)
207 {
208 TInterlaceContext *tinterlace = ctx->priv;
209
210 av_frame_free(&tinterlace->cur );
211 av_frame_free(&tinterlace->next);
212 av_freep(&tinterlace->black_data[0]);
213 }
214
config_out_props(AVFilterLink * outlink)215 static int config_out_props(AVFilterLink *outlink)
216 {
217 AVFilterContext *ctx = outlink->src;
218 AVFilterLink *inlink = outlink->src->inputs[0];
219 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(outlink->format);
220 TInterlaceContext *tinterlace = ctx->priv;
221 int i;
222
223 tinterlace->vsub = desc->log2_chroma_h;
224 outlink->w = inlink->w;
225 outlink->h = tinterlace->mode == MODE_MERGE || tinterlace->mode == MODE_PAD || tinterlace->mode == MODE_MERGEX2?
226 inlink->h*2 : inlink->h;
227 if (tinterlace->mode == MODE_MERGE || tinterlace->mode == MODE_PAD || tinterlace->mode == MODE_MERGEX2)
228 outlink->sample_aspect_ratio = av_mul_q(inlink->sample_aspect_ratio,
229 av_make_q(2, 1));
230
231 if (tinterlace->mode == MODE_PAD) {
232 uint8_t black[4] = { 0, 0, 0, 16 };
233 int ret;
234 ff_draw_init(&tinterlace->draw, outlink->format, 0);
235 ff_draw_color(&tinterlace->draw, &tinterlace->color, black);
236 if (ff_fmt_is_in(outlink->format, full_scale_yuvj_pix_fmts))
237 tinterlace->color.comp[0].u8[0] = 0;
238 ret = av_image_alloc(tinterlace->black_data, tinterlace->black_linesize,
239 outlink->w, outlink->h, outlink->format, 16);
240 if (ret < 0)
241 return ret;
242
243 ff_fill_rectangle(&tinterlace->draw, &tinterlace->color, tinterlace->black_data,
244 tinterlace->black_linesize, 0, 0, outlink->w, outlink->h);
245 }
246 if (tinterlace->flags & (TINTERLACE_FLAG_VLPF | TINTERLACE_FLAG_CVLPF)
247 && !(tinterlace->mode == MODE_INTERLEAVE_TOP
248 || tinterlace->mode == MODE_INTERLEAVE_BOTTOM)) {
249 av_log(ctx, AV_LOG_WARNING, "low_pass_filter flags ignored with mode %d\n",
250 tinterlace->mode);
251 tinterlace->flags &= ~(TINTERLACE_FLAG_VLPF | TINTERLACE_FLAG_CVLPF);
252 }
253 tinterlace->preout_time_base = inlink->time_base;
254 if (tinterlace->mode == MODE_INTERLACEX2) {
255 tinterlace->preout_time_base.den *= 2;
256 outlink->frame_rate = av_mul_q(inlink->frame_rate, (AVRational){2,1});
257 outlink->time_base = av_mul_q(inlink->time_base , (AVRational){1,2});
258 } else if (tinterlace->mode == MODE_MERGEX2) {
259 outlink->frame_rate = inlink->frame_rate;
260 outlink->time_base = inlink->time_base;
261 } else if (tinterlace->mode != MODE_PAD) {
262 outlink->frame_rate = av_mul_q(inlink->frame_rate, (AVRational){1,2});
263 outlink->time_base = av_mul_q(inlink->time_base , (AVRational){2,1});
264 }
265
266 for (i = 0; i<FF_ARRAY_ELEMS(standard_tbs); i++){
267 if (!av_cmp_q(standard_tbs[i], outlink->time_base))
268 break;
269 }
270 if (i == FF_ARRAY_ELEMS(standard_tbs) ||
271 (tinterlace->flags & TINTERLACE_FLAG_EXACT_TB))
272 outlink->time_base = tinterlace->preout_time_base;
273
274 tinterlace->csp = av_pix_fmt_desc_get(outlink->format);
275 if (tinterlace->flags & TINTERLACE_FLAG_CVLPF) {
276 if (tinterlace->csp->comp[0].depth > 8)
277 tinterlace->lowpass_line = lowpass_line_complex_c_16;
278 else
279 tinterlace->lowpass_line = lowpass_line_complex_c;
280 if (ARCH_X86)
281 ff_tinterlace_init_x86(tinterlace);
282 } else if (tinterlace->flags & TINTERLACE_FLAG_VLPF) {
283 if (tinterlace->csp->comp[0].depth > 8)
284 tinterlace->lowpass_line = lowpass_line_c_16;
285 else
286 tinterlace->lowpass_line = lowpass_line_c;
287 if (ARCH_X86)
288 ff_tinterlace_init_x86(tinterlace);
289 }
290
291 av_log(ctx, AV_LOG_VERBOSE, "mode:%d filter:%s h:%d -> h:%d\n", tinterlace->mode,
292 (tinterlace->flags & TINTERLACE_FLAG_CVLPF) ? "complex" :
293 (tinterlace->flags & TINTERLACE_FLAG_VLPF) ? "linear" : "off",
294 inlink->h, outlink->h);
295
296 return 0;
297 }
298
299 #define FIELD_UPPER 0
300 #define FIELD_LOWER 1
301 #define FIELD_UPPER_AND_LOWER 2
302
303 /**
304 * Copy picture field from src to dst.
305 *
306 * @param src_field copy from upper, lower field or both
307 * @param interleave leave a padding line between each copied line
308 * @param dst_field copy to upper or lower field,
309 * only meaningful when interleave is selected
310 * @param flags context flags
311 */
312 static inline
copy_picture_field(TInterlaceContext * tinterlace,uint8_t * dst[4],int dst_linesize[4],const uint8_t * src[4],int src_linesize[4],enum AVPixelFormat format,int w,int src_h,int src_field,int interleave,int dst_field,int flags)313 void copy_picture_field(TInterlaceContext *tinterlace,
314 uint8_t *dst[4], int dst_linesize[4],
315 const uint8_t *src[4], int src_linesize[4],
316 enum AVPixelFormat format, int w, int src_h,
317 int src_field, int interleave, int dst_field,
318 int flags)
319 {
320 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(format);
321 int hsub = desc->log2_chroma_w;
322 int plane, vsub = desc->log2_chroma_h;
323 int k = src_field == FIELD_UPPER_AND_LOWER ? 1 : 2;
324 int h;
325
326 for (plane = 0; plane < desc->nb_components; plane++) {
327 int lines = plane == 1 || plane == 2 ? AV_CEIL_RSHIFT(src_h, vsub) : src_h;
328 int cols = plane == 1 || plane == 2 ? AV_CEIL_RSHIFT( w, hsub) : w;
329 uint8_t *dstp = dst[plane];
330 const uint8_t *srcp = src[plane];
331 int srcp_linesize = src_linesize[plane] * k;
332 int dstp_linesize = dst_linesize[plane] * (interleave ? 2 : 1);
333 int clip_max = (1 << tinterlace->csp->comp[plane].depth) - 1;
334
335 lines = (lines + (src_field == FIELD_UPPER)) / k;
336 if (src_field == FIELD_LOWER)
337 srcp += src_linesize[plane];
338 if (interleave && dst_field == FIELD_LOWER)
339 dstp += dst_linesize[plane];
340 // Low-pass filtering is required when creating an interlaced destination from
341 // a progressive source which contains high-frequency vertical detail.
342 // Filtering will reduce interlace 'twitter' and Moire patterning.
343 if (flags & (TINTERLACE_FLAG_VLPF | TINTERLACE_FLAG_CVLPF)) {
344 int x = !!(flags & TINTERLACE_FLAG_CVLPF);
345 for (h = lines; h > 0; h--) {
346 ptrdiff_t pref = src_linesize[plane];
347 ptrdiff_t mref = -pref;
348 if (h >= (lines - x)) mref = 0; // there is no line above
349 else if (h <= (1 + x)) pref = 0; // there is no line below
350
351 tinterlace->lowpass_line(dstp, cols, srcp, mref, pref, clip_max);
352 dstp += dstp_linesize;
353 srcp += srcp_linesize;
354 }
355 } else {
356 if (tinterlace->csp->comp[plane].depth > 8)
357 cols *= 2;
358 av_image_copy_plane(dstp, dstp_linesize, srcp, srcp_linesize, cols, lines);
359 }
360 }
361 }
362
filter_frame(AVFilterLink * inlink,AVFrame * picref)363 static int filter_frame(AVFilterLink *inlink, AVFrame *picref)
364 {
365 AVFilterContext *ctx = inlink->dst;
366 AVFilterLink *outlink = ctx->outputs[0];
367 TInterlaceContext *tinterlace = ctx->priv;
368 AVFrame *cur, *next, *out;
369 int field, tff, ret;
370
371 av_frame_free(&tinterlace->cur);
372 tinterlace->cur = tinterlace->next;
373 tinterlace->next = picref;
374
375 cur = tinterlace->cur;
376 next = tinterlace->next;
377 /* we need at least two frames */
378 if (!tinterlace->cur)
379 return 0;
380
381 switch (tinterlace->mode) {
382 case MODE_MERGEX2: /* move the odd frame into the upper field of the new image, even into
383 * the lower field, generating a double-height video at same framerate */
384 case MODE_MERGE: /* move the odd frame into the upper field of the new image, even into
385 * the lower field, generating a double-height video at half framerate */
386 out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
387 if (!out)
388 return AVERROR(ENOMEM);
389 av_frame_copy_props(out, cur);
390 out->height = outlink->h;
391 out->interlaced_frame = 1;
392 out->top_field_first = 1;
393 out->sample_aspect_ratio = av_mul_q(cur->sample_aspect_ratio, av_make_q(2, 1));
394
395 /* write odd frame lines into the upper field of the new frame */
396 copy_picture_field(tinterlace, out->data, out->linesize,
397 (const uint8_t **)cur->data, cur->linesize,
398 inlink->format, inlink->w, inlink->h,
399 FIELD_UPPER_AND_LOWER, 1, tinterlace->mode == MODE_MERGEX2 ? (1 + inlink->frame_count_out) & 1 ? FIELD_LOWER : FIELD_UPPER : FIELD_UPPER, tinterlace->flags);
400 /* write even frame lines into the lower field of the new frame */
401 copy_picture_field(tinterlace, out->data, out->linesize,
402 (const uint8_t **)next->data, next->linesize,
403 inlink->format, inlink->w, inlink->h,
404 FIELD_UPPER_AND_LOWER, 1, tinterlace->mode == MODE_MERGEX2 ? (1 + inlink->frame_count_out) & 1 ? FIELD_UPPER : FIELD_LOWER : FIELD_LOWER, tinterlace->flags);
405 if (tinterlace->mode != MODE_MERGEX2)
406 av_frame_free(&tinterlace->next);
407 break;
408
409 case MODE_DROP_ODD: /* only output even frames, odd frames are dropped; height unchanged, half framerate */
410 case MODE_DROP_EVEN: /* only output odd frames, even frames are dropped; height unchanged, half framerate */
411 out = av_frame_clone(tinterlace->mode == MODE_DROP_EVEN ? cur : next);
412 if (!out)
413 return AVERROR(ENOMEM);
414 av_frame_free(&tinterlace->next);
415 break;
416
417 case MODE_PAD: /* expand each frame to double height, but pad alternate
418 * lines with black; framerate unchanged */
419 out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
420 if (!out)
421 return AVERROR(ENOMEM);
422 av_frame_copy_props(out, cur);
423 out->height = outlink->h;
424 out->sample_aspect_ratio = av_mul_q(cur->sample_aspect_ratio, av_make_q(2, 1));
425
426 field = (1 + outlink->frame_count_in) & 1 ? FIELD_UPPER : FIELD_LOWER;
427 /* copy upper and lower fields */
428 copy_picture_field(tinterlace, out->data, out->linesize,
429 (const uint8_t **)cur->data, cur->linesize,
430 inlink->format, inlink->w, inlink->h,
431 FIELD_UPPER_AND_LOWER, 1, field, tinterlace->flags);
432 /* pad with black the other field */
433 copy_picture_field(tinterlace, out->data, out->linesize,
434 (const uint8_t **)tinterlace->black_data, tinterlace->black_linesize,
435 inlink->format, inlink->w, inlink->h,
436 FIELD_UPPER_AND_LOWER, 1, !field, tinterlace->flags);
437 break;
438
439 /* interleave upper/lower lines from odd frames with lower/upper lines from even frames,
440 * halving the frame rate and preserving image height */
441 case MODE_INTERLEAVE_TOP: /* top field first */
442 case MODE_INTERLEAVE_BOTTOM: /* bottom field first */
443 if ((tinterlace->flags & TINTERLACE_FLAG_BYPASS_IL) && cur->interlaced_frame) {
444 av_log(ctx, AV_LOG_WARNING,
445 "video is already interlaced, adjusting framerate only\n");
446 out = av_frame_clone(cur);
447 if (!out)
448 return AVERROR(ENOMEM);
449 out->pts /= 2; // adjust pts to new framerate
450 ret = ff_filter_frame(outlink, out);
451 return ret;
452 }
453 tff = tinterlace->mode == MODE_INTERLEAVE_TOP;
454 out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
455 if (!out)
456 return AVERROR(ENOMEM);
457 av_frame_copy_props(out, cur);
458 out->interlaced_frame = 1;
459 out->top_field_first = tff;
460
461 /* copy upper/lower field from cur */
462 copy_picture_field(tinterlace, out->data, out->linesize,
463 (const uint8_t **)cur->data, cur->linesize,
464 inlink->format, inlink->w, inlink->h,
465 tff ? FIELD_UPPER : FIELD_LOWER, 1, tff ? FIELD_UPPER : FIELD_LOWER,
466 tinterlace->flags);
467 /* copy lower/upper field from next */
468 copy_picture_field(tinterlace, out->data, out->linesize,
469 (const uint8_t **)next->data, next->linesize,
470 inlink->format, inlink->w, inlink->h,
471 tff ? FIELD_LOWER : FIELD_UPPER, 1, tff ? FIELD_LOWER : FIELD_UPPER,
472 tinterlace->flags);
473 av_frame_free(&tinterlace->next);
474 break;
475 case MODE_INTERLACEX2: /* re-interlace preserving image height, double frame rate */
476 /* output current frame first */
477 out = av_frame_clone(cur);
478 if (!out)
479 return AVERROR(ENOMEM);
480 out->interlaced_frame = 1;
481 if (cur->pts != AV_NOPTS_VALUE)
482 out->pts = cur->pts*2;
483
484 out->pts = av_rescale_q(out->pts, tinterlace->preout_time_base, outlink->time_base);
485 if ((ret = ff_filter_frame(outlink, out)) < 0)
486 return ret;
487
488 /* output mix of current and next frame */
489 tff = next->top_field_first;
490 out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
491 if (!out)
492 return AVERROR(ENOMEM);
493 av_frame_copy_props(out, next);
494 out->interlaced_frame = 1;
495 out->top_field_first = !tff;
496
497 if (next->pts != AV_NOPTS_VALUE && cur->pts != AV_NOPTS_VALUE)
498 out->pts = cur->pts + next->pts;
499 else
500 out->pts = AV_NOPTS_VALUE;
501 /* write current frame second field lines into the second field of the new frame */
502 copy_picture_field(tinterlace, out->data, out->linesize,
503 (const uint8_t **)cur->data, cur->linesize,
504 inlink->format, inlink->w, inlink->h,
505 tff ? FIELD_LOWER : FIELD_UPPER, 1, tff ? FIELD_LOWER : FIELD_UPPER,
506 tinterlace->flags);
507 /* write next frame first field lines into the first field of the new frame */
508 copy_picture_field(tinterlace, out->data, out->linesize,
509 (const uint8_t **)next->data, next->linesize,
510 inlink->format, inlink->w, inlink->h,
511 tff ? FIELD_UPPER : FIELD_LOWER, 1, tff ? FIELD_UPPER : FIELD_LOWER,
512 tinterlace->flags);
513 break;
514 default:
515 av_assert0(0);
516 }
517
518 out->pts = av_rescale_q(out->pts, tinterlace->preout_time_base, outlink->time_base);
519 ret = ff_filter_frame(outlink, out);
520
521 return ret;
522 }
523
init_interlace(AVFilterContext * ctx)524 static int init_interlace(AVFilterContext *ctx)
525 {
526 TInterlaceContext *tinterlace = ctx->priv;
527
528 if (tinterlace->mode <= MODE_BFF)
529 tinterlace->mode += MODE_INTERLEAVE_TOP;
530
531 tinterlace->flags |= TINTERLACE_FLAG_BYPASS_IL;
532 if (tinterlace->lowpass == VLPF_LIN)
533 tinterlace->flags |= TINTERLACE_FLAG_VLPF;
534 if (tinterlace->lowpass == VLPF_CMP)
535 tinterlace->flags |= TINTERLACE_FLAG_CVLPF;
536
537 return 0;
538 }
539
540 static const AVFilterPad tinterlace_inputs[] = {
541 {
542 .name = "default",
543 .type = AVMEDIA_TYPE_VIDEO,
544 .filter_frame = filter_frame,
545 },
546 { NULL }
547 };
548
549 static const AVFilterPad tinterlace_outputs[] = {
550 {
551 .name = "default",
552 .type = AVMEDIA_TYPE_VIDEO,
553 .config_props = config_out_props,
554 },
555 { NULL }
556 };
557
558 AVFilter ff_vf_tinterlace = {
559 .name = "tinterlace",
560 .description = NULL_IF_CONFIG_SMALL("Perform temporal field interlacing."),
561 .priv_size = sizeof(TInterlaceContext),
562 .uninit = uninit,
563 .query_formats = query_formats,
564 .inputs = tinterlace_inputs,
565 .outputs = tinterlace_outputs,
566 .priv_class = &tinterlace_class,
567 };
568
569
570 AVFilter ff_vf_interlace = {
571 .name = "interlace",
572 .description = NULL_IF_CONFIG_SMALL("Convert progressive video into interlaced."),
573 .priv_size = sizeof(TInterlaceContext),
574 .init = init_interlace,
575 .uninit = uninit,
576 .query_formats = query_formats,
577 .inputs = tinterlace_inputs,
578 .outputs = tinterlace_outputs,
579 .priv_class = &interlace_class,
580 };
581