FFmpeg
vf_weave.c
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1 /*
2  * Copyright (c) 2013 Paul B Mahol
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 #include "libavutil/imgutils.h"
22 #include "libavutil/opt.h"
23 #include "libavutil/pixdesc.h"
24 #include "avfilter.h"
25 #include "internal.h"
26 
27 typedef struct WeaveContext {
28  const AVClass *class;
31  int nb_planes;
32  int planeheight[4];
33  int linesize[4];
34 
36 } WeaveContext;
37 
38 #define OFFSET(x) offsetof(WeaveContext, x)
39 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
40 
41 static const AVOption weave_options[] = {
42  { "first_field", "set first field", OFFSET(first_field), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS, "field"},
43  { "top", "set top field first", 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, FLAGS, "field"},
44  { "t", "set top field first", 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, FLAGS, "field"},
45  { "bottom", "set bottom field first", 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, FLAGS, "field"},
46  { "b", "set bottom field first", 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, FLAGS, "field"},
47  { NULL }
48 };
49 
51 
53 {
55  int ret;
56 
60  if (ret < 0)
61  return ret;
63 }
64 
65 static int config_props_output(AVFilterLink *outlink)
66 {
67  AVFilterContext *ctx = outlink->src;
68  WeaveContext *s = ctx->priv;
69  AVFilterLink *inlink = ctx->inputs[0];
71  int ret;
72 
73  if (!s->double_weave) {
74  outlink->time_base.num = inlink->time_base.num * 2;
75  outlink->time_base.den = inlink->time_base.den;
76  outlink->frame_rate.num = inlink->frame_rate.num;
77  outlink->frame_rate.den = inlink->frame_rate.den * 2;
78  }
79  outlink->w = inlink->w;
80  outlink->h = inlink->h * 2;
81 
82  if ((ret = av_image_fill_linesizes(s->linesize, inlink->format, inlink->w)) < 0)
83  return ret;
84 
85  s->planeheight[1] = s->planeheight[2] = AV_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h);
86  s->planeheight[0] = s->planeheight[3] = inlink->h;
87 
88  s->nb_planes = av_pix_fmt_count_planes(inlink->format);
89 
90  return 0;
91 }
92 
93 typedef struct ThreadData {
94  AVFrame *in, *out;
95 } ThreadData;
96 
97 static int weave_slice(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
98 {
99  AVFilterLink *inlink = ctx->inputs[0];
100  WeaveContext *s = ctx->priv;
101  ThreadData *td = arg;
102  AVFrame *in = td->in;
103  AVFrame *out = td->out;
104 
105  const int weave = (s->double_weave && !(inlink->frame_count_out & 1));
106  const int field1 = weave ? s->first_field : (!s->first_field);
107  const int field2 = weave ? (!s->first_field) : s->first_field;
108 
109  for (int i = 0; i < s->nb_planes; i++) {
110  const int height = s->planeheight[i];
111  const int start = (height * jobnr) / nb_jobs;
112  const int end = (height * (jobnr+1)) / nb_jobs;
113 
114  av_image_copy_plane(out->data[i] + out->linesize[i] * field1 +
115  out->linesize[i] * start * 2,
116  out->linesize[i] * 2,
117  in->data[i] + start * in->linesize[i],
118  in->linesize[i],
119  s->linesize[i], end - start);
120  av_image_copy_plane(out->data[i] + out->linesize[i] * field2 +
121  out->linesize[i] * start * 2,
122  out->linesize[i] * 2,
123  s->prev->data[i] + start * s->prev->linesize[i],
124  s->prev->linesize[i],
125  s->linesize[i], end - start);
126  }
127 
128  return 0;
129 }
130 
132 {
133  AVFilterContext *ctx = inlink->dst;
134  WeaveContext *s = ctx->priv;
135  AVFilterLink *outlink = ctx->outputs[0];
136  ThreadData td;
137  AVFrame *out;
138 
139  if (!s->prev) {
140  s->prev = in;
141  return 0;
142  }
143 
144  out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
145  if (!out) {
146  av_frame_free(&in);
147  av_frame_free(&s->prev);
148  return AVERROR(ENOMEM);
149  }
151 
152  td.out = out, td.in = in;
153  ctx->internal->execute(ctx, weave_slice, &td, NULL, FFMIN(s->planeheight[1],
155 
156  out->pts = s->double_weave ? s->prev->pts : in->pts / 2;
157  out->interlaced_frame = 1;
158  out->top_field_first = !s->first_field;
159 
160  if (!s->double_weave)
161  av_frame_free(&in);
162  av_frame_free(&s->prev);
163  if (s->double_weave)
164  s->prev = in;
165  return ff_filter_frame(outlink, out);
166 }
167 
169 {
170  WeaveContext *s = ctx->priv;
171 
172  av_frame_free(&s->prev);
173 }
174 
175 static const AVFilterPad weave_inputs[] = {
176  {
177  .name = "default",
178  .type = AVMEDIA_TYPE_VIDEO,
179  .filter_frame = filter_frame,
180  },
181  { NULL }
182 };
183 
184 static const AVFilterPad weave_outputs[] = {
185  {
186  .name = "default",
187  .type = AVMEDIA_TYPE_VIDEO,
188  .config_props = config_props_output,
189  },
190  { NULL }
191 };
192 
194  .name = "weave",
195  .description = NULL_IF_CONFIG_SMALL("Weave input video fields into frames."),
196  .priv_size = sizeof(WeaveContext),
197  .priv_class = &weave_class,
199  .uninit = uninit,
200  .inputs = weave_inputs,
203 };
204 
206 {
207  WeaveContext *s = ctx->priv;
208 
209  if (!strcmp(ctx->filter->name, "doubleweave"))
210  s->double_weave = 1;
211 
212  return 0;
213 }
214 
215 #define doubleweave_options weave_options
216 AVFILTER_DEFINE_CLASS(doubleweave);
217 
219  .name = "doubleweave",
220  .description = NULL_IF_CONFIG_SMALL("Weave input video fields into double number of frames."),
221  .priv_size = sizeof(WeaveContext),
222  .priv_class = &doubleweave_class,
224  .init = init,
225  .uninit = uninit,
226  .inputs = weave_inputs,
229 };
formats
formats
Definition: signature.h:48
ff_get_video_buffer
AVFrame * ff_get_video_buffer(AVFilterLink *link, int w, int h)
Request a picture buffer with a specific set of permissions.
Definition: video.c:97
td
#define td
Definition: regdef.h:70
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
opt.h
out
FILE * out
Definition: movenc.c:54
WeaveContext::double_weave
int double_weave
Definition: vf_weave.c:30
ff_filter_frame
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
Definition: avfilter.c:978
av_pix_fmt_desc_get
const AVPixFmtDescriptor * av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
Definition: pixdesc.c:2540
ff_formats_pixdesc_filter
int ff_formats_pixdesc_filter(AVFilterFormats **rfmts, unsigned want, unsigned rej)
Construct a formats list containing all pixel formats with certain properties.
Definition: formats.c:360
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
pixdesc.h
AVFrame::pts
int64_t pts
Presentation timestamp in time_base units (time when frame should be shown to user).
Definition: frame.h:396
AVOption
AVOption.
Definition: opt.h:247
AVFilter::name
const char * name
Filter name.
Definition: avfilter.h:149
ThreadData::out
AVFrame * out
Definition: af_adeclick.c:502
weave_outputs
static const AVFilterPad weave_outputs[]
Definition: vf_weave.c:184
AVFormatContext::internal
AVFormatInternal * internal
An opaque field for libavformat internal usage.
Definition: avformat.h:1565
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
AVFilterFormats
A list of supported formats for one end of a filter link.
Definition: formats.h:64
av_pix_fmt_count_planes
int av_pix_fmt_count_planes(enum AVPixelFormat pix_fmt)
Definition: pixdesc.c:2580
weave_inputs
static const AVFilterPad weave_inputs[]
Definition: vf_weave.c:175
AV_PIX_FMT_FLAG_HWACCEL
#define AV_PIX_FMT_FLAG_HWACCEL
Pixel format is an HW accelerated format.
Definition: pixdesc.h:128
AVRational::num
int num
Numerator.
Definition: rational.h:59
AVFilterPad
A filter pad used for either input or output.
Definition: internal.h:54
WeaveContext::first_field
int first_field
Definition: vf_weave.c:29
uninit
static av_cold void uninit(AVFilterContext *ctx)
Definition: vf_weave.c:168
av_cold
#define av_cold
Definition: attributes.h:90
inputs
these buffered frames must be flushed immediately if a new input produces new the filter must not call request_frame to get more It must just process the frame or queue it The task of requesting more frames is left to the filter s request_frame method or the application If a filter has several inputs
Definition: filter_design.txt:243
ff_set_common_formats
int ff_set_common_formats(AVFilterContext *ctx, AVFilterFormats *formats)
A helper for query_formats() which sets all links to the same list of formats.
Definition: formats.c:580
WeaveContext::prev
AVFrame * prev
Definition: vf_weave.c:35
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:58
outputs
static const AVFilterPad outputs[]
Definition: af_acontrast.c:203
ctx
AVFormatContext * ctx
Definition: movenc.c:48
arg
const char * arg
Definition: jacosubdec.c:67
AVClass
Describe the class of an AVClass context structure.
Definition: log.h:66
NULL
#define NULL
Definition: coverity.c:32
av_frame_copy_props
int av_frame_copy_props(AVFrame *dst, const AVFrame *src)
Copy only "metadata" fields from src to dst.
Definition: frame.c:537
WeaveContext::planeheight
int planeheight[4]
Definition: vf_weave.c:32
AVFILTER_DEFINE_CLASS
AVFILTER_DEFINE_CLASS(weave)
for
for(j=16;j >0;--j)
Definition: h264pred_template.c:469
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:116
ff_vf_doubleweave
const AVFilter ff_vf_doubleweave
Definition: vf_weave.c:218
query_formats
static int query_formats(AVFilterContext *ctx)
Definition: vf_weave.c:52
WeaveContext::nb_planes
int nb_planes
Definition: vf_weave.c:31
height
#define height
FFMIN
#define FFMIN(a, b)
Definition: common.h:105
internal.h
filter_frame
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
Definition: vf_weave.c:131
i
int i
Definition: input.c:406
ff_filter_get_nb_threads
int ff_filter_get_nb_threads(AVFilterContext *ctx)
Get number of threads for current filter instance.
Definition: avfilter.c:762
ThreadData
Used for passing data between threads.
Definition: dsddec.c:67
WeaveContext
Definition: vf_weave.c:27
AVFilterPad::name
const char * name
Pad name.
Definition: internal.h:60
AVFilter
Filter definition.
Definition: avfilter.h:145
ret
ret
Definition: filter_design.txt:187
config_props_output
static int config_props_output(AVFilterLink *outlink)
Definition: vf_weave.c:65
weave_options
static const AVOption weave_options[]
Definition: vf_weave.c:41
OFFSET
#define OFFSET(x)
Definition: vf_weave.c:38
AVRational::den
int den
Denominator.
Definition: rational.h:60
AV_OPT_TYPE_INT
@ AV_OPT_TYPE_INT
Definition: opt.h:224
avfilter.h
weave_slice
static int weave_slice(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
Definition: vf_weave.c:97
AVFilterContext
An instance of a filter.
Definition: avfilter.h:333
AVFILTER_FLAG_SLICE_THREADS
#define AVFILTER_FLAG_SLICE_THREADS
The filter supports multithreading by splitting frames into multiple parts and processing them concur...
Definition: avfilter.h:117
desc
const char * desc
Definition: libsvtav1.c:79
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
ThreadData::in
AVFrame * in
Definition: af_adenorm.c:223
FLAGS
#define FLAGS
Definition: vf_weave.c:39
AVPixFmtDescriptor
Descriptor that unambiguously describes how the bits of a pixel are stored in the up to 4 data planes...
Definition: pixdesc.h:69
imgutils.h
flags
#define flags(name, subs,...)
Definition: cbs_av1.c:561
AVFrame::linesize
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:334
WeaveContext::linesize
int linesize[4]
Definition: vf_weave.c:33
first_field
static int first_field(const struct video_data *s)
Definition: v4l2.c:235
AV_PIX_FMT_FLAG_PAL
#define AV_PIX_FMT_FLAG_PAL
Pixel format has a palette in data[1], values are indexes in this palette.
Definition: pixdesc.h:120
AV_OPT_TYPE_CONST
@ AV_OPT_TYPE_CONST
Definition: opt.h:233
init
static av_cold int init(AVFilterContext *ctx)
Definition: vf_weave.c:205
ff_vf_weave
const AVFilter ff_vf_weave
Definition: vf_weave.c:193