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 "filters.h"
24 #include "internal.h"
25 
26 typedef struct RepeatFieldsContext {
27  const AVClass *class;
28  int state;
29  int nb_planes;
30  int linesize[4];
31  int planeheight[4];
34 
36 {
37  RepeatFieldsContext *s = ctx->priv;
38 
39  av_frame_free(&s->frame);
40 }
41 
42 static const enum AVPixelFormat pixel_fmts_eq[] = {
50 };
51 
53 {
54  RepeatFieldsContext *s = inlink->dst->priv;
56  int ret;
57 
58  if ((ret = av_image_fill_linesizes(s->linesize, inlink->format, inlink->w)) < 0)
59  return ret;
60 
61  s->planeheight[1] = s->planeheight[2] = AV_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h);
62  s->planeheight[0] = s->planeheight[3] = inlink->h;
63 
64  s->nb_planes = av_pix_fmt_count_planes(inlink->format);
65 
66  return 0;
67 }
68 
69 static void update_pts(AVFilterLink *link, AVFrame *f, int64_t pts, int fields)
70 {
71  if (av_cmp_q(link->frame_rate, (AVRational){30000, 1001}) == 0 &&
72  av_cmp_q(link->time_base, (AVRational){1001, 60000}) <= 0
73  ) {
74  f->pts = pts + av_rescale_q(fields, (AVRational){1001, 60000}, link->time_base);
75  } else
76  f->pts = AV_NOPTS_VALUE;
77 }
78 
80 {
81  AVFilterContext *ctx = inlink->dst;
82  AVFilterLink *outlink = inlink->dst->outputs[0];
83  RepeatFieldsContext *s = ctx->priv;
84  int ret, i;
85  int state = s->state;
86 
87  if (!s->frame) {
88  s->frame = av_frame_clone(in);
89  if (!s->frame) {
90  av_frame_free(&in);
91  return AVERROR(ENOMEM);
92  }
93  s->frame->pts = AV_NOPTS_VALUE;
94  }
95 
96  if ((state == 0 && !(in->flags & AV_FRAME_FLAG_TOP_FIELD_FIRST)) ||
97  (state == 1 && (in->flags & AV_FRAME_FLAG_TOP_FIELD_FIRST))) {
98  av_log(ctx, AV_LOG_WARNING, "Unexpected field flags: "
99  "state=%d top_field_first=%d repeat_first_field=%d\n",
101  in->repeat_pict);
102  state ^= 1;
103  }
104 
105  if (state == 0) {
106  AVFrame *new;
107 
108  new = av_frame_clone(in);
109  if (!new) {
110  av_frame_free(&in);
111  return AVERROR(ENOMEM);
112  }
113 
114  ret = ff_filter_frame(outlink, new);
115 
116  if (in->repeat_pict) {
118  if (ret < 0) {
119  av_frame_free(&in);
120  return ret;
121  }
122  update_pts(outlink, s->frame, in->pts, 2);
123  for (i = 0; i < s->nb_planes; i++) {
124  av_image_copy_plane(s->frame->data[i], s->frame->linesize[i] * 2,
125  in->data[i], in->linesize[i] * 2,
126  s->linesize[i], s->planeheight[i] / 2);
127  }
128  state = 1;
129  }
130  } else {
131  for (i = 0; i < s->nb_planes; i++) {
133  if (ret < 0) {
134  av_frame_free(&in);
135  return ret;
136  }
137  av_image_copy_plane(s->frame->data[i] + s->frame->linesize[i], s->frame->linesize[i] * 2,
138  in->data[i] + in->linesize[i], in->linesize[i] * 2,
139  s->linesize[i], s->planeheight[i] / 2);
140  }
141 
142  ret = ff_filter_frame(outlink, av_frame_clone(s->frame));
143 
144  if (in->repeat_pict) {
145  AVFrame *new;
146 
147  new = av_frame_clone(in);
148  if (!new) {
149  av_frame_free(&in);
150  return AVERROR(ENOMEM);
151  }
152 
153  ret = ff_filter_frame(outlink, new);
154  state = 0;
155  } else {
157  if (ret < 0) {
158  av_frame_free(&in);
159  return ret;
160  }
161  update_pts(outlink, s->frame, in->pts, 1);
162  for (i = 0; i < s->nb_planes; i++) {
163  av_image_copy_plane(s->frame->data[i], s->frame->linesize[i] * 2,
164  in->data[i], in->linesize[i] * 2,
165  s->linesize[i], s->planeheight[i] / 2);
166  }
167  }
168  }
169 
170  s->state = state;
171 
172  av_frame_free(&in);
173  return ret;
174 }
175 
177  {
178  .name = "default",
179  .type = AVMEDIA_TYPE_VIDEO,
180  .filter_frame = filter_frame,
181  .config_props = config_input,
182  },
183 };
184 
186  {
187  .name = "default",
188  .type = AVMEDIA_TYPE_VIDEO,
189  },
190 };
191 
193  .name = "repeatfields",
194  .description = NULL_IF_CONFIG_SMALL("Hard repeat fields based on MPEG repeat field flag."),
195  .priv_size = sizeof(RepeatFieldsContext),
196  .uninit = uninit,
200 };
ff_vf_repeatfields
const AVFilter ff_vf_repeatfields
Definition: vf_repeatfields.c:192
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
ff_filter_frame
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
Definition: avfilter.c:971
av_pix_fmt_desc_get
const AVPixFmtDescriptor * av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
Definition: pixdesc.c:2936
FILTER_PIXFMTS_ARRAY
#define FILTER_PIXFMTS_ARRAY(array)
Definition: internal.h:174
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:100
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:330
AVFrame::pts
int64_t pts
Presentation timestamp in time_base units (time when frame should be shown to user).
Definition: frame.h:442
AVFrame::flags
int flags
Frame flags, a combination of AV_FRAME_FLAGS.
Definition: frame.h:639
AVFilter::name
const char * name
Filter name.
Definition: avfilter.h:170
AVFrame::data
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:351
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_FRAME_FLAG_TOP_FIELD_FIRST
#define AV_FRAME_FLAG_TOP_FIELD_FIRST
A flag to mark frames where the top field is displayed first if the content is interlaced.
Definition: frame.h:631
av_pix_fmt_count_planes
int av_pix_fmt_count_planes(enum AVPixelFormat pix_fmt)
Definition: pixdesc.c:2976
pts
static int64_t pts
Definition: transcode_aac.c:643
AVFilterPad
A filter pad used for either input or output.
Definition: internal.h:49
uninit
static av_cold void uninit(AVFilterContext *ctx)
Definition: vf_repeatfields.c:35
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:256
AV_CEIL_RSHIFT
#define AV_CEIL_RSHIFT(a, b)
Definition: common.h:50
RepeatFieldsContext::frame
AVFrame * frame
Definition: vf_repeatfields.c:32
RepeatFieldsContext
Definition: vf_repeatfields.c:26
filters.h
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:609
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:142
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
FILTER_INPUTS
#define FILTER_INPUTS(array)
Definition: internal.h:194
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
ff_inlink_make_frame_writable
int ff_inlink_make_frame_writable(AVFilterLink *link, AVFrame **rframe)
Make sure a frame is writable.
Definition: avfilter.c:1418
RepeatFieldsContext::nb_planes
int nb_planes
Definition: vf_repeatfields.c:29
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
AV_PIX_FMT_GRAY8
@ AV_PIX_FMT_GRAY8
Y , 8bpp.
Definition: pixfmt.h:74
RepeatFieldsContext::state
int state
Definition: vf_repeatfields.c:28
RepeatFieldsContext::planeheight
int planeheight[4]
Definition: vf_repeatfields.c:31
f
f
Definition: af_crystalizer.c:122
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:114
update_pts
static void update_pts(AVFilterLink *link, AVFrame *f, int64_t pts, int fields)
Definition: vf_repeatfields.c:69
AV_NOPTS_VALUE
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:248
AVFrame::time_base
AVRational time_base
Time base for the timestamps in this frame.
Definition: frame.h:457
RepeatFieldsContext::linesize
int linesize[4]
Definition: vf_repeatfields.c:30
internal.h
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:269
config_input
static int config_input(AVFilterLink *inlink)
Definition: vf_repeatfields.c:52
pixel_fmts_eq
static enum AVPixelFormat pixel_fmts_eq[]
Definition: vf_repeatfields.c:42
AVFilterPad::name
const char * name
Pad name.
Definition: internal.h:55
repeatfields_outputs
static const AVFilterPad repeatfields_outputs[]
Definition: vf_repeatfields.c:185
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:166
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:397
desc
const char * desc
Definition: libsvtav1.c:83
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:79
repeatfields_inputs
static const AVFilterPad repeatfields_inputs[]
Definition: vf_repeatfields.c:176
AVPixFmtDescriptor
Descriptor that unambiguously describes how the bits of a pixel are stored in the up to 4 data planes...
Definition: pixdesc.h:69
state
static struct @351 state
FILTER_OUTPUTS
#define FILTER_OUTPUTS(array)
Definition: internal.h:195
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, a positive or negative value, which is typically indicating the size in bytes of each pict...
Definition: frame.h:375
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:27
AVFrame::repeat_pict
int repeat_pict
Number of fields in this frame which should be repeated, i.e.
Definition: frame.h:511