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1 | /* |
2 | * Copyright (c) 2012 Rudolf Polzer | |
3 | * Copyright (c) 2013 Paul B Mahol | |
4 | * | |
5 | * This file is part of FFmpeg. | |
6 | * | |
7 | * FFmpeg is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU Lesser General Public | |
9 | * License as published by the Free Software Foundation; either | |
10 | * version 2.1 of the License, or (at your option) any later version. | |
11 | * | |
12 | * FFmpeg is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | * Lesser General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU Lesser General Public | |
18 | * License along with FFmpeg; if not, write to the Free Software | |
19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
20 | */ | |
21 | ||
22 | /** | |
23 | * @file telecine filter, heavily based from mpv-player:TOOLS/vf_dlopen/telecine.c by | |
24 | * Rudolf Polzer. | |
25 | */ | |
26 | ||
27 | #include "libavutil/avstring.h" | |
28 | #include "libavutil/imgutils.h" | |
29 | #include "libavutil/opt.h" | |
30 | #include "libavutil/pixdesc.h" | |
31 | #include "avfilter.h" | |
32 | #include "formats.h" | |
33 | #include "internal.h" | |
34 | #include "video.h" | |
35 | ||
36 | typedef struct { | |
37 | const AVClass *class; | |
38 | int first_field; | |
39 | char *pattern; | |
40 | unsigned int pattern_pos; | |
41 | ||
42 | AVRational pts; | |
43 | double ts_unit; | |
44 | int out_cnt; | |
45 | int occupied; | |
46 | ||
47 | int nb_planes; | |
48 | int planeheight[4]; | |
49 | int stride[4]; | |
50 | ||
51 | AVFrame *frame[5]; | |
52 | AVFrame *temp; | |
53 | } TelecineContext; | |
54 | ||
55 | #define OFFSET(x) offsetof(TelecineContext, x) | |
56 | #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM | |
57 | ||
58 | static const AVOption telecine_options[] = { | |
59 | {"first_field", "select first field", OFFSET(first_field), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS, "field"}, | |
60 | {"top", "select top field first", 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, FLAGS, "field"}, | |
61 | {"t", "select top field first", 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, FLAGS, "field"}, | |
62 | {"bottom", "select bottom field first", 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, FLAGS, "field"}, | |
63 | {"b", "select bottom field first", 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, FLAGS, "field"}, | |
64 | {"pattern", "pattern that describe for how many fields a frame is to be displayed", OFFSET(pattern), AV_OPT_TYPE_STRING, {.str="23"}, 0, 0, FLAGS}, | |
65 | {NULL} | |
66 | }; | |
67 | ||
68 | AVFILTER_DEFINE_CLASS(telecine); | |
69 | ||
70 | static av_cold int init(AVFilterContext *ctx) | |
71 | { | |
72 | TelecineContext *tc = ctx->priv; | |
73 | const char *p; | |
74 | int max = 0; | |
75 | ||
76 | if (!strlen(tc->pattern)) { | |
77 | av_log(ctx, AV_LOG_ERROR, "No pattern provided.\n"); | |
78 | return AVERROR_INVALIDDATA; | |
79 | } | |
80 | ||
81 | for (p = tc->pattern; *p; p++) { | |
82 | if (!av_isdigit(*p)) { | |
83 | av_log(ctx, AV_LOG_ERROR, "Provided pattern includes non-numeric characters.\n"); | |
84 | return AVERROR_INVALIDDATA; | |
85 | } | |
86 | ||
87 | max = FFMAX(*p - '0', max); | |
88 | tc->pts.num += 2; | |
89 | tc->pts.den += *p - '0'; | |
90 | } | |
91 | ||
92 | tc->out_cnt = (max + 1) / 2; | |
93 | av_log(ctx, AV_LOG_INFO, "Telecine pattern %s yields up to %d frames per frame, pts advance factor: %d/%d\n", | |
94 | tc->pattern, tc->out_cnt, tc->pts.num, tc->pts.den); | |
95 | ||
96 | return 0; | |
97 | } | |
98 | ||
99 | static int query_formats(AVFilterContext *ctx) | |
100 | { | |
101 | AVFilterFormats *pix_fmts = NULL; | |
102 | int fmt; | |
103 | ||
104 | for (fmt = 0; av_pix_fmt_desc_get(fmt); fmt++) { | |
105 | const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(fmt); | |
106 | if (!(desc->flags & AV_PIX_FMT_FLAG_HWACCEL || | |
107 | desc->flags & AV_PIX_FMT_FLAG_PAL || | |
108 | desc->flags & AV_PIX_FMT_FLAG_BITSTREAM)) | |
109 | ff_add_format(&pix_fmts, fmt); | |
110 | } | |
111 | ||
112 | ff_set_common_formats(ctx, pix_fmts); | |
113 | return 0; | |
114 | } | |
115 | ||
116 | static int config_input(AVFilterLink *inlink) | |
117 | { | |
118 | TelecineContext *tc = inlink->dst->priv; | |
119 | const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format); | |
120 | int i, ret; | |
121 | ||
122 | tc->temp = ff_get_video_buffer(inlink, inlink->w, inlink->h); | |
123 | if (!tc->temp) | |
124 | return AVERROR(ENOMEM); | |
125 | for (i = 0; i < tc->out_cnt; i++) { | |
126 | tc->frame[i] = ff_get_video_buffer(inlink, inlink->w, inlink->h); | |
127 | if (!tc->frame[i]) | |
128 | return AVERROR(ENOMEM); | |
129 | } | |
130 | ||
131 | if ((ret = av_image_fill_linesizes(tc->stride, inlink->format, inlink->w)) < 0) | |
132 | return ret; | |
133 | ||
134 | tc->planeheight[1] = tc->planeheight[2] = FF_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h); | |
135 | tc->planeheight[0] = tc->planeheight[3] = inlink->h; | |
136 | ||
137 | tc->nb_planes = av_pix_fmt_count_planes(inlink->format); | |
138 | ||
139 | return 0; | |
140 | } | |
141 | ||
142 | static int config_output(AVFilterLink *outlink) | |
143 | { | |
144 | AVFilterContext *ctx = outlink->src; | |
145 | TelecineContext *tc = ctx->priv; | |
146 | const AVFilterLink *inlink = ctx->inputs[0]; | |
147 | AVRational fps = inlink->frame_rate; | |
148 | ||
149 | if (!fps.num || !fps.den) { | |
150 | av_log(ctx, AV_LOG_ERROR, "The input needs a constant frame rate; " | |
151 | "current rate of %d/%d is invalid\n", fps.num, fps.den); | |
152 | return AVERROR(EINVAL); | |
153 | } | |
154 | fps = av_mul_q(fps, av_inv_q(tc->pts)); | |
155 | av_log(ctx, AV_LOG_VERBOSE, "FPS: %d/%d -> %d/%d\n", | |
156 | inlink->frame_rate.num, inlink->frame_rate.den, fps.num, fps.den); | |
157 | ||
158 | outlink->flags |= FF_LINK_FLAG_REQUEST_LOOP; | |
159 | outlink->frame_rate = fps; | |
160 | outlink->time_base = av_mul_q(inlink->time_base, tc->pts); | |
161 | av_log(ctx, AV_LOG_VERBOSE, "TB: %d/%d -> %d/%d\n", | |
162 | inlink->time_base.num, inlink->time_base.den, outlink->time_base.num, outlink->time_base.den); | |
163 | ||
164 | tc->ts_unit = av_q2d(av_inv_q(av_mul_q(fps, outlink->time_base))); | |
165 | ||
166 | return 0; | |
167 | } | |
168 | ||
169 | static int filter_frame(AVFilterLink *inlink, AVFrame *inpicref) | |
170 | { | |
171 | AVFilterContext *ctx = inlink->dst; | |
172 | AVFilterLink *outlink = ctx->outputs[0]; | |
173 | TelecineContext *tc = ctx->priv; | |
174 | int i, len, ret = 0, nout = 0; | |
175 | ||
176 | len = tc->pattern[tc->pattern_pos] - '0'; | |
177 | ||
178 | tc->pattern_pos++; | |
179 | if (!tc->pattern[tc->pattern_pos]) | |
180 | tc->pattern_pos = 0; | |
181 | ||
182 | if (!len) { // do not output any field from this frame | |
183 | av_frame_free(&inpicref); | |
184 | return 0; | |
185 | } | |
186 | ||
187 | if (tc->occupied) { | |
188 | for (i = 0; i < tc->nb_planes; i++) { | |
189 | // fill in the EARLIER field from the buffered pic | |
190 | av_image_copy_plane(tc->frame[nout]->data[i] + tc->frame[nout]->linesize[i] * tc->first_field, | |
191 | tc->frame[nout]->linesize[i] * 2, | |
192 | tc->temp->data[i] + tc->temp->linesize[i] * tc->first_field, | |
193 | tc->temp->linesize[i] * 2, | |
194 | tc->stride[i], | |
195 | (tc->planeheight[i] - tc->first_field + 1) / 2); | |
196 | // fill in the LATER field from the new pic | |
197 | av_image_copy_plane(tc->frame[nout]->data[i] + tc->frame[nout]->linesize[i] * !tc->first_field, | |
198 | tc->frame[nout]->linesize[i] * 2, | |
199 | inpicref->data[i] + inpicref->linesize[i] * !tc->first_field, | |
200 | inpicref->linesize[i] * 2, | |
201 | tc->stride[i], | |
202 | (tc->planeheight[i] - !tc->first_field + 1) / 2); | |
203 | } | |
204 | nout++; | |
205 | len--; | |
206 | tc->occupied = 0; | |
207 | } | |
208 | ||
209 | while (len >= 2) { | |
210 | // output THIS image as-is | |
211 | for (i = 0; i < tc->nb_planes; i++) | |
212 | av_image_copy_plane(tc->frame[nout]->data[i], tc->frame[nout]->linesize[i], | |
213 | inpicref->data[i], inpicref->linesize[i], | |
214 | tc->stride[i], | |
215 | tc->planeheight[i]); | |
216 | nout++; | |
217 | len -= 2; | |
218 | } | |
219 | ||
220 | if (len >= 1) { | |
221 | // copy THIS image to the buffer, we need it later | |
222 | for (i = 0; i < tc->nb_planes; i++) | |
223 | av_image_copy_plane(tc->temp->data[i], tc->temp->linesize[i], | |
224 | inpicref->data[i], inpicref->linesize[i], | |
225 | tc->stride[i], | |
226 | tc->planeheight[i]); | |
227 | tc->occupied = 1; | |
228 | } | |
229 | ||
230 | for (i = 0; i < nout; i++) { | |
231 | AVFrame *frame = av_frame_clone(tc->frame[i]); | |
232 | ||
233 | if (!frame) { | |
234 | av_frame_free(&inpicref); | |
235 | return AVERROR(ENOMEM); | |
236 | } | |
237 | ||
238 | frame->pts = outlink->frame_count * tc->ts_unit; | |
239 | ret = ff_filter_frame(outlink, frame); | |
240 | } | |
241 | av_frame_free(&inpicref); | |
242 | ||
243 | return ret; | |
244 | } | |
245 | ||
246 | static av_cold void uninit(AVFilterContext *ctx) | |
247 | { | |
248 | TelecineContext *tc = ctx->priv; | |
249 | int i; | |
250 | ||
251 | av_frame_free(&tc->temp); | |
252 | for (i = 0; i < tc->out_cnt; i++) | |
253 | av_frame_free(&tc->frame[i]); | |
254 | } | |
255 | ||
256 | static const AVFilterPad telecine_inputs[] = { | |
257 | { | |
258 | .name = "default", | |
259 | .type = AVMEDIA_TYPE_VIDEO, | |
260 | .filter_frame = filter_frame, | |
261 | .config_props = config_input, | |
262 | }, | |
263 | { NULL } | |
264 | }; | |
265 | ||
266 | static const AVFilterPad telecine_outputs[] = { | |
267 | { | |
268 | .name = "default", | |
269 | .type = AVMEDIA_TYPE_VIDEO, | |
270 | .config_props = config_output, | |
271 | }, | |
272 | { NULL } | |
273 | }; | |
274 | ||
275 | AVFilter ff_vf_telecine = { | |
276 | .name = "telecine", | |
277 | .description = NULL_IF_CONFIG_SMALL("Apply a telecine pattern."), | |
278 | .priv_size = sizeof(TelecineContext), | |
279 | .priv_class = &telecine_class, | |
280 | .init = init, | |
281 | .uninit = uninit, | |
282 | .query_formats = query_formats, | |
283 | .inputs = telecine_inputs, | |
284 | .outputs = telecine_outputs, | |
285 | }; |