FFmpeg: libavfilter/vf_fieldorder.c Source File

FFmpeg
vf_fieldorder.c
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1 /*
2  * Copyright (c) 2011 Mark Himsley
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (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 GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 /**
22  * @file
23  * video field order filter, heavily influenced by vf_pad.c
24  */
25 
26 #include "libavutil/imgutils.h"
27 #include "libavutil/internal.h"
28 #include "libavutil/opt.h"
29 #include "libavutil/pixdesc.h"
30 #include "avfilter.h"
31 #include "formats.h"
32 #include "internal.h"
33 #include "video.h"
34 
35  typedef struct {
36   const AVClass *class;
37   int dst_tff; ///< output bff/tff
38   int line_size[4]; ///< bytes of pixel data per line for each plane
39 } FieldOrderContext;
40 
41  static int query_formats(AVFilterContext *ctx)
42 {
43  AVFilterFormats *formats;
44  enum AVPixelFormat pix_fmt;
45  int ret;
46 
47  /** accept any input pixel format that is not hardware accelerated, not
48  * a bitstream format, and does not have vertically sub-sampled chroma */
49  if (ctx->inputs[0]) {
50  formats = NULL;
51  for (pix_fmt = 0; pix_fmt < AV_PIX_FMT_NB; pix_fmt++) {
52  const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
53  if (!(desc->flags & AV_PIX_FMT_FLAG_HWACCEL ||
54  desc->flags & AV_PIX_FMT_FLAG_PAL ||
55  desc->flags & AV_PIX_FMT_FLAG_BITSTREAM) &&
56  desc->nb_components && !desc->log2_chroma_h &&
57  (ret = ff_add_format(&formats, pix_fmt)) < 0) {
58  ff_formats_unref(&formats);
59  return ret;
60  }
61  }
62  ff_formats_ref(formats, &ctx->inputs[0]->out_formats);
63  ff_formats_ref(formats, &ctx->outputs[0]->in_formats);
64  }
65 
66  return 0;
67 }
68 
69  static int config_input(AVFilterLink *inlink)
70 {
71  AVFilterContext *ctx = inlink->dst;
72  FieldOrderContext *s = ctx->priv;
73 
74  return av_image_fill_linesizes(s->line_size, inlink->format, inlink->w);
75 }
76 
77  static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
78 {
79  AVFilterContext *ctx = inlink->dst;
80  FieldOrderContext *s = ctx->priv;
81  AVFilterLink *outlink = ctx->outputs[0];
82  int h, plane, src_line_step, dst_line_step, line_size, line;
83  uint8_t *dst, *src;
84  AVFrame *out;
85 
86  if (!frame->interlaced_frame ||
87  frame->top_field_first == s->dst_tff) {
88  av_log(ctx, AV_LOG_VERBOSE,
89  "Skipping %s.\n",
90  frame->interlaced_frame ?
91  "frame with same field order" : "progressive frame");
92  return ff_filter_frame(outlink, frame);
93  }
94 
95  if (av_frame_is_writable(frame)) {
96  out = frame;
97  } else {
98  out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
99  if (!out) {
100  av_frame_free(&frame);
101  return AVERROR(ENOMEM);
102  }
103  av_frame_copy_props(out, frame);
104  }
105 
106  av_dlog(ctx,
107  "picture will move %s one line\n",
108  s->dst_tff ? "up" : "down");
109  h = frame->height;
110  for (plane = 0; plane < 4 && frame->data[plane] && frame->linesize[plane]; plane++) {
111  dst_line_step = out->linesize[plane];
112  src_line_step = frame->linesize[plane];
113  line_size = s->line_size[plane];
114  dst = out->data[plane];
115  src = frame->data[plane];
116  if (s->dst_tff) {
117  /** Move every line up one line, working from
118  * the top to the bottom of the frame.
119  * The original top line is lost.
120  * The new last line is created as a copy of the
121  * penultimate line from that field. */
122  for (line = 0; line < h; line++) {
123  if (1 + line < frame-> height) {
124  memcpy(dst, src + src_line_step, line_size);
125  } else {
126  memcpy(dst, src - 2 * src_line_step, line_size);
127  }
128  dst += dst_line_step;
129  src += src_line_step;
130  }
131  } else {
132  /** Move every line down one line, working from
133  * the bottom to the top of the frame.
134  * The original bottom line is lost.
135  * The new first line is created as a copy of the
136  * second line from that field. */
137  dst += (h - 1) * dst_line_step;
138  src += (h - 1) * src_line_step;
139  for (line = h - 1; line >= 0 ; line--) {
140  if (line > 0) {
141  memcpy(dst, src - src_line_step, line_size);
142  } else {
143  memcpy(dst, src + 2 * src_line_step, line_size);
144  }
145  dst -= dst_line_step;
146  src -= src_line_step;
147  }
148  }
149  }
150  out->top_field_first = s->dst_tff;
151 
152  if (frame != out)
153  av_frame_free(&frame);
154  return ff_filter_frame(outlink, out);
155 }
156 
157  #define OFFSET(x) offsetof(FieldOrderContext, x)
158  #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
159 
160  static const AVOption fieldorder_options[] = {
161  { "order", "output field order", OFFSET(dst_tff), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 1, FLAGS, "order" },
162  { "bff", "bottom field first", 0, AV_OPT_TYPE_CONST, { .i64 = 0 }, .flags=FLAGS, .unit = "order" },
163  { "tff", "top field first", 0, AV_OPT_TYPE_CONST, { .i64 = 1 }, .flags=FLAGS, .unit = "order" },
164  { NULL }
165 };
166 
167 AVFILTER_DEFINE_CLASS(fieldorder);
168 
169  static const AVFilterPad avfilter_vf_fieldorder_inputs[] = {
170  {
171  .name = "default",
172  .type = AVMEDIA_TYPE_VIDEO,
173  .config_props = config_input,
174  .filter_frame = filter_frame,
175  },
176  { NULL }
177 };
178 
179  static const AVFilterPad avfilter_vf_fieldorder_outputs[] = {
180  {
181  .name = "default",
182  .type = AVMEDIA_TYPE_VIDEO,
183  },
184  { NULL }
185 };
186 
187  AVFilter avfilter_vf_fieldorder = {
188  .name = "fieldorder",
189  .description = NULL_IF_CONFIG_SMALL("Set the field order."),
190  .priv_size = sizeof(FieldOrderContext),
191  .priv_class = &fieldorder_class,
192  .query_formats = query_formats,
193  .inputs = avfilter_vf_fieldorder_inputs,
194  .outputs = avfilter_vf_fieldorder_outputs,
195  .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
196 };
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