FFmpeg: libavfilter/vf_repeatfields.c Source File

FFmpeg
vf_repeatfields.c
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1 /*
2  * Copyright (c) 2003 Tobias Diedrich
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License as published by
8  * the Free Software Foundation; either version 2 of the License, or
9  * (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14  * GNU General Public License for more details.
15  *
16  * You should have received a copy of the GNU General Public License along
17  * with FFmpeg; if not, write to the Free Software Foundation, Inc.,
18  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
19  */
20 
21 #include "libavutil/imgutils.h"
22 #include "avfilter.h"
23 #include "internal.h"
24 
25  typedef struct RepeatFieldsContext {
26   const AVClass *class;
27   int state;
28   int nb_planes;
29   int linesize[4];
30   int planeheight[4];
31   AVFrame *frame;
32 } RepeatFieldsContext;
33 
34  static av_cold void uninit(AVFilterContext *ctx)
35 {
36  RepeatFieldsContext *s = ctx->priv;
37 
38  av_frame_free(&s->frame);
39 }
40 
41  static int query_formats(AVFilterContext *ctx)
42 {
43  static const enum AVPixelFormat pixel_fmts_eq[] = {
44  AV_PIX_FMT_GRAY8,
45  AV_PIX_FMT_YUV410P,
46  AV_PIX_FMT_YUV411P,
47  AV_PIX_FMT_YUV420P,
48  AV_PIX_FMT_YUV422P,
49  AV_PIX_FMT_YUV444P,
50  AV_PIX_FMT_NONE
51  };
52 
53  ff_set_common_formats(ctx, ff_make_format_list(pixel_fmts_eq));
54 
55  return 0;
56 }
57 
58  static int config_input(AVFilterLink *inlink)
59 {
60  RepeatFieldsContext *s = inlink->dst->priv;
61  const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
62  int ret;
63 
64  if ((ret = av_image_fill_linesizes(s->linesize, inlink->format, inlink->w)) < 0)
65  return ret;
66 
67  s->planeheight[1] = s->planeheight[2] = FF_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h);
68  s->planeheight[0] = s->planeheight[3] = inlink->h;
69 
70  s->nb_planes = av_pix_fmt_count_planes(inlink->format);
71 
72  return 0;
73 }
74 
75  static void update_pts(AVFilterLink *link, AVFrame *f, int64_t pts, int fields)
76 {
77  if (av_cmp_q(link->frame_rate, (AVRational){30000, 1001}) == 0 &&
78  av_cmp_q(link->time_base, (AVRational){1001, 60000}) <= 0
79  ) {
80  f->pts = pts + av_rescale_q(fields, (AVRational){1001, 60000}, link->time_base);
81  } else
82  f->pts = AV_NOPTS_VALUE;
83 }
84 
85  static int filter_frame(AVFilterLink *inlink, AVFrame *in) {
86  AVFilterContext *ctx = inlink->dst;
87  AVFilterLink *outlink = inlink->dst->outputs[0];
88  RepeatFieldsContext *s = ctx->priv;
89  AVFrame *out;
90  int ret, i;
91  int state = s->state;
92 
93  if (!s->frame) {
94  s->frame = av_frame_clone(in);
95  if (!s->frame)
96  return AVERROR(ENOMEM);
97  s->frame->pts = AV_NOPTS_VALUE;
98  }
99 
100  out = s->frame;
101 
102  if ((state == 0 && !in->top_field_first) ||
103  (state == 1 && in->top_field_first)) {
104  av_log(ctx, AV_LOG_WARNING, "Unexpected field flags: "
105  "state=%d top_field_first=%d repeat_first_field=%d\n",
106  state, in->top_field_first, in->repeat_pict);
107  state ^= 1;
108  }
109 
110  if (state == 0) {
111  AVFrame *new;
112 
113  new = av_frame_clone(in);
114  if (!new)
115  return AVERROR(ENOMEM);
116 
117  ret = ff_filter_frame(outlink, new);
118 
119  if (in->repeat_pict) {
120  av_frame_make_writable(out);
121  update_pts(outlink, out, in->pts, 2);
122  for (i = 0; i < s->nb_planes; i++) {
123  av_image_copy_plane(out->data[i], out->linesize[i] * 2,
124  in->data[i], in->linesize[i] * 2,
125  s->linesize[i], s->planeheight[i] / 2);
126  }
127  state = 1;
128  }
129  } else {
130  for (i = 0; i < s->nb_planes; i++) {
131  av_frame_make_writable(out);
132  av_image_copy_plane(out->data[i] + out->linesize[i], out->linesize[i] * 2,
133  in->data[i] + in->linesize[i], in->linesize[i] * 2,
134  s->linesize[i], s->planeheight[i] / 2);
135  }
136 
137  ret = ff_filter_frame(outlink, av_frame_clone(out));
138 
139  if (in->repeat_pict) {
140  AVFrame *new;
141 
142  new = av_frame_clone(in);
143  if (!new)
144  return AVERROR(ENOMEM);
145 
146  ret = ff_filter_frame(outlink, new);
147  state = 0;
148  } else {
149  av_frame_make_writable(out);
150  update_pts(outlink, out, in->pts, 1);
151  for (i = 0; i < s->nb_planes; i++) {
152  av_image_copy_plane(out->data[i], out->linesize[i] * 2,
153  in->data[i], in->linesize[i] * 2,
154  s->linesize[i], s->planeheight[i] / 2);
155  }
156  }
157  }
158 
159  s->state = state;
160 
161  av_frame_free(&in);
162  return ret;
163 }
164 
165  static const AVFilterPad repeatfields_inputs[] = {
166  {
167  .name = "default",
168  .type = AVMEDIA_TYPE_VIDEO,
169  .filter_frame = filter_frame,
170  .config_props = config_input,
171  },
172  { NULL }
173 };
174 
175  static const AVFilterPad repeatfields_outputs[] = {
176  {
177  .name = "default",
178  .type = AVMEDIA_TYPE_VIDEO,
179  },
180  { NULL }
181 };
182 
183  AVFilter ff_vf_repeatfields = {
184  .name = "repeatfields",
185  .description = NULL_IF_CONFIG_SMALL("Hard repeat fields based on MPEG repeat field flag."),
186  .priv_size = sizeof(RepeatFieldsContext),
187  .uninit = uninit,
188  .inputs = repeatfields_inputs,
189  .outputs = repeatfields_outputs,
190  .query_formats = query_formats,
191 };
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