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vf_telecine.c
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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;
39  char *pattern;
40  unsigned int pattern_pos;
41 
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 
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 
100 {
101  AVFilterFormats *pix_fmts = NULL;
102  int fmt;
103 
104  for (fmt = 0; fmt < AV_PIX_FMT_NB; 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 ||
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 
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 
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,
283  .inputs = telecine_inputs,
284  .outputs = telecine_outputs,
285 };