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vf_il.c
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1 /*
2  * Copyright (c) 2002 Michael Niedermayer <michaelni@gmx.at>
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
24  * (de)interleave fields filter
25  */
26 
27 #include "libavutil/opt.h"
28 #include "libavutil/imgutils.h"
29 #include "libavutil/pixdesc.h"
30 #include "avfilter.h"
31 #include "internal.h"
32 
33 enum FilterMode {
34  MODE_NONE,
35  MODE_INTERLEAVE,
36  MODE_DEINTERLEAVE
37 };
38 
39 typedef struct {
40  const AVClass *class;
41  enum FilterMode luma_mode, chroma_mode, alpha_mode;
42  int luma_swap, chroma_swap, alpha_swap;
43  int nb_planes;
44  int linesize[4], chroma_height;
45  int has_alpha;
46 } IlContext;
47 
48 #define OFFSET(x) offsetof(IlContext, x)
49 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
50 
51 static const AVOption il_options[] = {
52  {"luma_mode", "select luma mode", OFFSET(luma_mode), AV_OPT_TYPE_INT, {.i64=MODE_NONE}, MODE_NONE, MODE_DEINTERLEAVE, FLAGS, "luma_mode"},
53  {"l", "select luma mode", OFFSET(luma_mode), AV_OPT_TYPE_INT, {.i64=MODE_NONE}, MODE_NONE, MODE_DEINTERLEAVE, FLAGS, "luma_mode"},
54  {"none", NULL, 0, AV_OPT_TYPE_CONST, {.i64=MODE_NONE}, 0, 0, FLAGS, "luma_mode"},
55  {"interleave", NULL, 0, AV_OPT_TYPE_CONST, {.i64=MODE_INTERLEAVE}, 0, 0, FLAGS, "luma_mode"},
56  {"i", NULL, 0, AV_OPT_TYPE_CONST, {.i64=MODE_INTERLEAVE}, 0, 0, FLAGS, "luma_mode"},
57  {"deinterleave", NULL, 0, AV_OPT_TYPE_CONST, {.i64=MODE_DEINTERLEAVE}, 0, 0, FLAGS, "luma_mode"},
58  {"d", NULL, 0, AV_OPT_TYPE_CONST, {.i64=MODE_DEINTERLEAVE}, 0, 0, FLAGS, "luma_mode"},
59  {"chroma_mode", "select chroma mode", OFFSET(chroma_mode), AV_OPT_TYPE_INT, {.i64=MODE_NONE}, MODE_NONE, MODE_DEINTERLEAVE, FLAGS, "chroma_mode"},
60  {"c", "select chroma mode", OFFSET(chroma_mode), AV_OPT_TYPE_INT, {.i64=MODE_NONE}, MODE_NONE, MODE_DEINTERLEAVE, FLAGS, "chroma_mode"},
61  {"none", NULL, 0, AV_OPT_TYPE_CONST, {.i64=MODE_NONE}, 0, 0, FLAGS, "chroma_mode"},
62  {"interleave", NULL, 0, AV_OPT_TYPE_CONST, {.i64=MODE_INTERLEAVE}, 0, 0, FLAGS, "chroma_mode"},
63  {"i", NULL, 0, AV_OPT_TYPE_CONST, {.i64=MODE_INTERLEAVE}, 0, 0, FLAGS, "chroma_mode"},
64  {"deinterleave", NULL, 0, AV_OPT_TYPE_CONST, {.i64=MODE_DEINTERLEAVE}, 0, 0, FLAGS, "chroma_mode"},
65  {"d", NULL, 0, AV_OPT_TYPE_CONST, {.i64=MODE_DEINTERLEAVE}, 0, 0, FLAGS, "chroma_mode"},
66  {"alpha_mode", "select alpha mode", OFFSET(alpha_mode), AV_OPT_TYPE_INT, {.i64=MODE_NONE}, MODE_NONE, MODE_DEINTERLEAVE, FLAGS, "alpha_mode"},
67  {"a", "select alpha mode", OFFSET(alpha_mode), AV_OPT_TYPE_INT, {.i64=MODE_NONE}, MODE_NONE, MODE_DEINTERLEAVE, FLAGS, "alpha_mode"},
68  {"none", NULL, 0, AV_OPT_TYPE_CONST, {.i64=MODE_NONE}, 0, 0, FLAGS, "alpha_mode"},
69  {"interleave", NULL, 0, AV_OPT_TYPE_CONST, {.i64=MODE_INTERLEAVE}, 0, 0, FLAGS, "alpha_mode"},
70  {"i", NULL, 0, AV_OPT_TYPE_CONST, {.i64=MODE_INTERLEAVE}, 0, 0, FLAGS, "alpha_mode"},
71  {"deinterleave", NULL, 0, AV_OPT_TYPE_CONST, {.i64=MODE_DEINTERLEAVE}, 0, 0, FLAGS, "alpha_mode"},
72  {"d", NULL, 0, AV_OPT_TYPE_CONST, {.i64=MODE_DEINTERLEAVE}, 0, 0, FLAGS, "alpha_mode"},
73  {"luma_swap", "swap luma fields", OFFSET(luma_swap), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS},
74  {"ls", "swap luma fields", OFFSET(luma_swap), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS},
75  {"chroma_swap", "swap chroma fields", OFFSET(chroma_swap), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS},
76  {"cs", "swap chroma fields", OFFSET(chroma_swap), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS},
77  {"alpha_swap", "swap alpha fields", OFFSET(alpha_swap), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS},
78  {"as", "swap alpha fields", OFFSET(alpha_swap), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS},
79  {NULL}
80 };
81 
82 AVFILTER_DEFINE_CLASS(il);
83 
84 static int query_formats(AVFilterContext *ctx)
85 {
86  AVFilterFormats *formats = NULL;
87  int fmt;
88 
89  for (fmt = 0; fmt < AV_PIX_FMT_NB; fmt++) {
90  const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(fmt);
91  if (!(desc->flags & AV_PIX_FMT_FLAG_PAL) && !(desc->flags & AV_PIX_FMT_FLAG_HWACCEL))
92  ff_add_format(&formats, fmt);
93  }
94 
95  ff_set_common_formats(ctx, formats);
96  return 0;
97 }
98 
99 static int config_input(AVFilterLink *inlink)
100 {
101  IlContext *il = inlink->dst->priv;
102  const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
103  int ret;
104 
105  il->nb_planes = av_pix_fmt_count_planes(inlink->format);
106 
107  il->has_alpha = !!(desc->flags & AV_PIX_FMT_FLAG_ALPHA);
108  if ((ret = av_image_fill_linesizes(il->linesize, inlink->format, inlink->w)) < 0)
109  return ret;
110 
111  il->chroma_height = FF_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h);
112 
113  return 0;
114 }
115 
116 static void interleave(uint8_t *dst, uint8_t *src, int w, int h,
117  int dst_linesize, int src_linesize,
118  enum FilterMode mode, int swap)
119 {
120  const int a = swap;
121  const int b = 1 - a;
122  const int m = h >> 1;
123  int y;
124 
125  switch (mode) {
126  case MODE_DEINTERLEAVE:
127  for (y = 0; y < m; y++) {
128  memcpy(dst + dst_linesize * y , src + src_linesize * (y * 2 + a), w);
129  memcpy(dst + dst_linesize * (y + m), src + src_linesize * (y * 2 + b), w);
130  }
131  break;
132  case MODE_NONE:
133  for (y = 0; y < m; y++) {
134  memcpy(dst + dst_linesize * y * 2 , src + src_linesize * (y * 2 + a), w);
135  memcpy(dst + dst_linesize * (y * 2 + 1), src + src_linesize * (y * 2 + b), w);
136  }
137  break;
138  case MODE_INTERLEAVE:
139  for (y = 0; y < m; y++) {
140  memcpy(dst + dst_linesize * (y * 2 + a), src + src_linesize * y , w);
141  memcpy(dst + dst_linesize * (y * 2 + b), src + src_linesize * (y + m), w);
142  }
143  break;
144  }
145 }
146 
147 static int filter_frame(AVFilterLink *inlink, AVFrame *inpicref)
148 {
149  IlContext *il = inlink->dst->priv;
150  AVFilterLink *outlink = inlink->dst->outputs[0];
151  AVFrame *out;
152  int comp;
153 
154  out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
155  if (!out) {
156  av_frame_free(&inpicref);
157  return AVERROR(ENOMEM);
158  }
159  av_frame_copy_props(out, inpicref);
160 
161  interleave(out->data[0], inpicref->data[0],
162  il->linesize[0], inlink->h,
163  out->linesize[0], inpicref->linesize[0],
164  il->luma_mode, il->luma_swap);
165 
166  for (comp = 1; comp < (il->nb_planes - il->has_alpha); comp++) {
167  interleave(out->data[comp], inpicref->data[comp],
168  il->linesize[comp], il->chroma_height,
169  out->linesize[comp], inpicref->linesize[comp],
170  il->chroma_mode, il->chroma_swap);
171  }
172 
173  if (il->has_alpha) {
174  comp = il->nb_planes - 1;
175  interleave(out->data[comp], inpicref->data[comp],
176  il->linesize[comp], inlink->h,
177  out->linesize[comp], inpicref->linesize[comp],
178  il->alpha_mode, il->alpha_swap);
179  }
180 
181  av_frame_free(&inpicref);
182  return ff_filter_frame(outlink, out);
183 }
184 
185 static const AVFilterPad inputs[] = {
186  {
187  .name = "default",
188  .type = AVMEDIA_TYPE_VIDEO,
189  .filter_frame = filter_frame,
190  .config_props = config_input,
191  },
192  { NULL }
193 };
194 
195 static const AVFilterPad outputs[] = {
196  {
197  .name = "default",
198  .type = AVMEDIA_TYPE_VIDEO,
199  },
200  { NULL }
201 };
202 
203 AVFilter ff_vf_il = {
204  .name = "il",
205  .description = NULL_IF_CONFIG_SMALL("Deinterleave or interleave fields."),
206  .priv_size = sizeof(IlContext),
207  .query_formats = query_formats,
208  .inputs = inputs,
209  .outputs = outputs,
210  .priv_class = &il_class,
211  .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
212 };
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