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];
33 
35 {
36  RepeatFieldsContext *s = ctx->priv;
37 
38  av_frame_free(&s->frame);
39 }
40 
42 {
43  static const enum AVPixelFormat pixel_fmts_eq[] = {
51  };
52 
53  return ff_set_common_formats_from_list(ctx, pixel_fmts_eq);
54 }
55 
57 {
58  RepeatFieldsContext *s = inlink->dst->priv;
60  int ret;
61 
62  if ((ret = av_image_fill_linesizes(s->linesize, inlink->format, inlink->w)) < 0)
63  return ret;
64 
65  s->planeheight[1] = s->planeheight[2] = AV_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h);
66  s->planeheight[0] = s->planeheight[3] = inlink->h;
67 
68  s->nb_planes = av_pix_fmt_count_planes(inlink->format);
69 
70  return 0;
71 }
72 
73 static void update_pts(AVFilterLink *link, AVFrame *f, int64_t pts, int fields)
74 {
75  if (av_cmp_q(link->frame_rate, (AVRational){30000, 1001}) == 0 &&
76  av_cmp_q(link->time_base, (AVRational){1001, 60000}) <= 0
77  ) {
78  f->pts = pts + av_rescale_q(fields, (AVRational){1001, 60000}, link->time_base);
79  } else
80  f->pts = AV_NOPTS_VALUE;
81 }
82 
84  AVFilterContext *ctx = inlink->dst;
85  AVFilterLink *outlink = inlink->dst->outputs[0];
86  RepeatFieldsContext *s = ctx->priv;
87  AVFrame *out;
88  int ret, i;
89  int state = s->state;
90 
91  if (!s->frame) {
92  s->frame = av_frame_clone(in);
93  if (!s->frame)
94  return AVERROR(ENOMEM);
95  s->frame->pts = AV_NOPTS_VALUE;
96  }
97 
98  out = s->frame;
99 
100  if ((state == 0 && !in->top_field_first) ||
101  (state == 1 && in->top_field_first)) {
102  av_log(ctx, AV_LOG_WARNING, "Unexpected field flags: "
103  "state=%d top_field_first=%d repeat_first_field=%d\n",
104  state, in->top_field_first, in->repeat_pict);
105  state ^= 1;
106  }
107 
108  if (state == 0) {
109  AVFrame *new;
110 
111  new = av_frame_clone(in);
112  if (!new)
113  return AVERROR(ENOMEM);
114 
115  ret = ff_filter_frame(outlink, new);
116 
117  if (in->repeat_pict) {
119  update_pts(outlink, out, in->pts, 2);
120  for (i = 0; i < s->nb_planes; i++) {
121  av_image_copy_plane(out->data[i], out->linesize[i] * 2,
122  in->data[i], in->linesize[i] * 2,
123  s->linesize[i], s->planeheight[i] / 2);
124  }
125  state = 1;
126  }
127  } else {
128  for (i = 0; i < s->nb_planes; i++) {
130  av_image_copy_plane(out->data[i] + out->linesize[i], out->linesize[i] * 2,
131  in->data[i] + in->linesize[i], in->linesize[i] * 2,
132  s->linesize[i], s->planeheight[i] / 2);
133  }
134 
135  ret = ff_filter_frame(outlink, av_frame_clone(out));
136 
137  if (in->repeat_pict) {
138  AVFrame *new;
139 
140  new = av_frame_clone(in);
141  if (!new)
142  return AVERROR(ENOMEM);
143 
144  ret = ff_filter_frame(outlink, new);
145  state = 0;
146  } else {
148  update_pts(outlink, out, in->pts, 1);
149  for (i = 0; i < s->nb_planes; i++) {
150  av_image_copy_plane(out->data[i], out->linesize[i] * 2,
151  in->data[i], in->linesize[i] * 2,
152  s->linesize[i], s->planeheight[i] / 2);
153  }
154  }
155  }
156 
157  s->state = state;
158 
159  av_frame_free(&in);
160  return ret;
161 }
162 
164  {
165  .name = "default",
166  .type = AVMEDIA_TYPE_VIDEO,
167  .filter_frame = filter_frame,
168  .config_props = config_input,
169  },
170 };
171 
173  {
174  .name = "default",
175  .type = AVMEDIA_TYPE_VIDEO,
176  },
177 };
178 
180  .name = "repeatfields",
181  .description = NULL_IF_CONFIG_SMALL("Hard repeat fields based on MPEG repeat field flag."),
182  .priv_size = sizeof(RepeatFieldsContext),
183  .uninit = uninit,
186  .query_formats = query_formats,
187 };
ff_vf_repeatfields
const AVFilter ff_vf_repeatfields
Definition: vf_repeatfields.c:179
AV_LOG_WARNING
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:186
AVPixelFormat
AVPixelFormat
Pixel format.
Definition: pixfmt.h:64
AVERROR
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later. That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another. Frame references ownership and permissions
out
FILE * out
Definition: movenc.c:54
ff_filter_frame
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
Definition: avfilter.c:1019
av_pix_fmt_desc_get
const AVPixFmtDescriptor * av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
Definition: pixdesc.c:2540
inlink
The exact code depends on how similar the blocks are and how related they are to the and needs to apply these operations to the correct inlink or outlink if there are several Macros are available to factor that when no extra processing is inlink
Definition: filter_design.txt:212
av_frame_free
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:112
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:303
av_frame_make_writable
int av_frame_make_writable(AVFrame *frame)
Ensure that the frame data is writable, avoiding data copy if possible.
Definition: frame.c:490
AVFrame::pts
int64_t pts
Presentation timestamp in time_base units (time when frame should be shown to user).
Definition: frame.h:396
AVFrame::top_field_first
int top_field_first
If the content is interlaced, is top field displayed first.
Definition: frame.h:438
AVFilter::name
const char * name
Filter name.
Definition: avfilter.h:153
AVFrame::data
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:317
av_image_copy_plane
void av_image_copy_plane(uint8_t *dst, int dst_linesize, const uint8_t *src, int src_linesize, int bytewidth, int height)
Copy image plane from src to dst.
Definition: imgutils.c:374
av_pix_fmt_count_planes
int av_pix_fmt_count_planes(enum AVPixelFormat pix_fmt)
Definition: pixdesc.c:2580
pts
static int64_t pts
Definition: transcode_aac.c:653
AVFilterPad
A filter pad used for either input or output.
Definition: internal.h:50
uninit
static av_cold void uninit(AVFilterContext *ctx)
Definition: vf_repeatfields.c:34
av_cold
#define av_cold
Definition: attributes.h:90
av_image_fill_linesizes
int av_image_fill_linesizes(int linesizes[4], enum AVPixelFormat pix_fmt, int width)
Fill plane linesizes for an image with pixel format pix_fmt and width width.
Definition: imgutils.c:89
s
#define s(width, name)
Definition: cbs_vp9.c:257
AV_CEIL_RSHIFT
#define AV_CEIL_RSHIFT(a, b)
Definition: common.h:51
RepeatFieldsContext::frame
AVFrame * frame
Definition: vf_repeatfields.c:31
RepeatFieldsContext
Definition: vf_repeatfields.c:25
ff_set_common_formats_from_list
int ff_set_common_formats_from_list(AVFilterContext *ctx, const int *fmts)
Equivalent to ff_set_common_formats(ctx, ff_make_format_list(fmts))
Definition: formats.c:703
ctx
AVFormatContext * ctx
Definition: movenc.c:48
av_frame_clone
AVFrame * av_frame_clone(const AVFrame *src)
Create a new frame that references the same data as src.
Definition: frame.c:424
av_rescale_q
int64_t av_rescale_q(int64_t a, AVRational bq, AVRational cq)
Rescale a 64-bit integer by 2 rational numbers.
Definition: mathematics.c:141
AV_PIX_FMT_YUV420P
@ AV_PIX_FMT_YUV420P
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
Definition: pixfmt.h:66
f
#define f(width, name)
Definition: cbs_vp9.c:255
FILTER_INPUTS
#define FILTER_INPUTS(array)
Definition: internal.h:152
link
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a link
Definition: filter_design.txt:23
RepeatFieldsContext::nb_planes
int nb_planes
Definition: vf_repeatfields.c:28
fields
the definition of that something depends on the semantic of the filter The callback must examine the status of the filter s links and proceed accordingly The status of output links is stored in the status_in and status_out fields and tested by the then the processing requires a frame on this link and the filter is expected to make efforts in that direction The status of input links is stored by the fifo and status_out fields
Definition: filter_design.txt:155
AVClass
Describe the class of an AVClass context structure.
Definition: log.h:66
AVRational
Rational number (pair of numerator and denominator).
Definition: rational.h:58
state
static struct @317 state
AV_PIX_FMT_GRAY8
@ AV_PIX_FMT_GRAY8
Y , 8bpp.
Definition: pixfmt.h:74
RepeatFieldsContext::state
int state
Definition: vf_repeatfields.c:27
RepeatFieldsContext::planeheight
int planeheight[4]
Definition: vf_repeatfields.c:30
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
update_pts
static void update_pts(AVFilterLink *link, AVFrame *f, int64_t pts, int fields)
Definition: vf_repeatfields.c:73
AV_NOPTS_VALUE
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:248
RepeatFieldsContext::linesize
int linesize[4]
Definition: vf_repeatfields.c:29
internal.h
query_formats
static int query_formats(AVFilterContext *ctx)
Definition: vf_repeatfields.c:41
i
int i
Definition: input.c:406
config_input
static int config_input(AVFilterLink *inlink)
Definition: vf_repeatfields.c:56
AVFilterPad::name
const char * name
Pad name.
Definition: internal.h:56
repeatfields_outputs
static const AVFilterPad repeatfields_outputs[]
Definition: vf_repeatfields.c:172
av_cmp_q
static int av_cmp_q(AVRational a, AVRational b)
Compare two rationals.
Definition: rational.h:89
AVFilter
Filter definition.
Definition: avfilter.h:149
ret
ret
Definition: filter_design.txt:187
AV_PIX_FMT_NONE
@ AV_PIX_FMT_NONE
Definition: pixfmt.h:65
avfilter.h
AV_PIX_FMT_YUV444P
@ AV_PIX_FMT_YUV444P
planar YUV 4:4:4, 24bpp, (1 Cr & Cb sample per 1x1 Y samples)
Definition: pixfmt.h:71
AVFilterContext
An instance of a filter.
Definition: avfilter.h:346
desc
const char * desc
Definition: libsvtav1.c:79
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
AV_PIX_FMT_YUV422P
@ AV_PIX_FMT_YUV422P
planar YUV 4:2:2, 16bpp, (1 Cr & Cb sample per 2x1 Y samples)
Definition: pixfmt.h:70
filter_frame
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
Definition: vf_repeatfields.c:83
repeatfields_inputs
static const AVFilterPad repeatfields_inputs[]
Definition: vf_repeatfields.c:163
AVPixFmtDescriptor
Descriptor that unambiguously describes how the bits of a pixel are stored in the up to 4 data planes...
Definition: pixdesc.h:69
FILTER_OUTPUTS
#define FILTER_OUTPUTS(array)
Definition: internal.h:153
AV_PIX_FMT_YUV411P
@ AV_PIX_FMT_YUV411P
planar YUV 4:1:1, 12bpp, (1 Cr & Cb sample per 4x1 Y samples)
Definition: pixfmt.h:73
imgutils.h
AVFrame::linesize
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:334
AV_PIX_FMT_YUV410P
@ AV_PIX_FMT_YUV410P
planar YUV 4:1:0, 9bpp, (1 Cr & Cb sample per 4x4 Y samples)
Definition: pixfmt.h:72
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:28
AVFrame::repeat_pict
int repeat_pict
When decoding, this signals how much the picture must be delayed.
Definition: frame.h:428