FFmpeg
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 "formats.h"
32 #include "internal.h"
33 #include "video.h"
34 
35 enum FilterMode {
36  MODE_NONE,
37  MODE_INTERLEAVE,
38  MODE_DEINTERLEAVE
39 };
40 
41 typedef struct IlContext {
42  const AVClass *class;
43  int luma_mode, chroma_mode, alpha_mode; ///<FilterMode
44  int luma_swap, chroma_swap, alpha_swap;
45  int nb_planes;
46  int linesize[4], chroma_height;
47  int has_alpha;
48 } IlContext;
49 
50 #define OFFSET(x) offsetof(IlContext, x)
51 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_RUNTIME_PARAM
52 
53 static const AVOption il_options[] = {
54  {"luma_mode", "select luma mode", OFFSET(luma_mode), AV_OPT_TYPE_INT, {.i64=MODE_NONE}, MODE_NONE, MODE_DEINTERLEAVE, FLAGS, .unit = "luma_mode"},
55  {"l", "select luma mode", OFFSET(luma_mode), AV_OPT_TYPE_INT, {.i64=MODE_NONE}, MODE_NONE, MODE_DEINTERLEAVE, FLAGS, .unit = "luma_mode"},
56  {"none", NULL, 0, AV_OPT_TYPE_CONST, {.i64=MODE_NONE}, 0, 0, FLAGS, .unit = "luma_mode"},
57  {"interleave", NULL, 0, AV_OPT_TYPE_CONST, {.i64=MODE_INTERLEAVE}, 0, 0, FLAGS, .unit = "luma_mode"},
58  {"i", NULL, 0, AV_OPT_TYPE_CONST, {.i64=MODE_INTERLEAVE}, 0, 0, FLAGS, .unit = "luma_mode"},
59  {"deinterleave", NULL, 0, AV_OPT_TYPE_CONST, {.i64=MODE_DEINTERLEAVE}, 0, 0, FLAGS, .unit = "luma_mode"},
60  {"d", NULL, 0, AV_OPT_TYPE_CONST, {.i64=MODE_DEINTERLEAVE}, 0, 0, FLAGS, .unit = "luma_mode"},
61  {"chroma_mode", "select chroma mode", OFFSET(chroma_mode), AV_OPT_TYPE_INT, {.i64=MODE_NONE}, MODE_NONE, MODE_DEINTERLEAVE, FLAGS, .unit = "chroma_mode"},
62  {"c", "select chroma mode", OFFSET(chroma_mode), AV_OPT_TYPE_INT, {.i64=MODE_NONE}, MODE_NONE, MODE_DEINTERLEAVE, FLAGS, .unit = "chroma_mode"},
63  {"none", NULL, 0, AV_OPT_TYPE_CONST, {.i64=MODE_NONE}, 0, 0, FLAGS, .unit = "chroma_mode"},
64  {"interleave", NULL, 0, AV_OPT_TYPE_CONST, {.i64=MODE_INTERLEAVE}, 0, 0, FLAGS, .unit = "chroma_mode"},
65  {"i", NULL, 0, AV_OPT_TYPE_CONST, {.i64=MODE_INTERLEAVE}, 0, 0, FLAGS, .unit = "chroma_mode"},
66  {"deinterleave", NULL, 0, AV_OPT_TYPE_CONST, {.i64=MODE_DEINTERLEAVE}, 0, 0, FLAGS, .unit = "chroma_mode"},
67  {"d", NULL, 0, AV_OPT_TYPE_CONST, {.i64=MODE_DEINTERLEAVE}, 0, 0, FLAGS, .unit = "chroma_mode"},
68  {"alpha_mode", "select alpha mode", OFFSET(alpha_mode), AV_OPT_TYPE_INT, {.i64=MODE_NONE}, MODE_NONE, MODE_DEINTERLEAVE, FLAGS, .unit = "alpha_mode"},
69  {"a", "select alpha mode", OFFSET(alpha_mode), AV_OPT_TYPE_INT, {.i64=MODE_NONE}, MODE_NONE, MODE_DEINTERLEAVE, FLAGS, .unit = "alpha_mode"},
70  {"none", NULL, 0, AV_OPT_TYPE_CONST, {.i64=MODE_NONE}, 0, 0, FLAGS, .unit = "alpha_mode"},
71  {"interleave", NULL, 0, AV_OPT_TYPE_CONST, {.i64=MODE_INTERLEAVE}, 0, 0, FLAGS, .unit = "alpha_mode"},
72  {"i", NULL, 0, AV_OPT_TYPE_CONST, {.i64=MODE_INTERLEAVE}, 0, 0, FLAGS, .unit = "alpha_mode"},
73  {"deinterleave", NULL, 0, AV_OPT_TYPE_CONST, {.i64=MODE_DEINTERLEAVE}, 0, 0, FLAGS, .unit = "alpha_mode"},
74  {"d", NULL, 0, AV_OPT_TYPE_CONST, {.i64=MODE_DEINTERLEAVE}, 0, 0, FLAGS, .unit = "alpha_mode"},
75  {"luma_swap", "swap luma fields", OFFSET(luma_swap), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS},
76  {"ls", "swap luma fields", OFFSET(luma_swap), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS},
77  {"chroma_swap", "swap chroma fields", OFFSET(chroma_swap), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS},
78  {"cs", "swap chroma fields", OFFSET(chroma_swap), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS},
79  {"alpha_swap", "swap alpha fields", OFFSET(alpha_swap), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS},
80  {"as", "swap alpha fields", OFFSET(alpha_swap), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS},
81  {NULL}
82 };
83 
84 AVFILTER_DEFINE_CLASS(il);
85 
86 static int query_formats(AVFilterContext *ctx)
87 {
88  int reject_flags = AV_PIX_FMT_FLAG_PAL | AV_PIX_FMT_FLAG_HWACCEL;
89 
90  return ff_set_common_formats(ctx, ff_formats_pixdesc_filter(0, reject_flags));
91 }
92 
93 static int config_input(AVFilterLink *inlink)
94 {
95  IlContext *s = inlink->dst->priv;
96  const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
97  int ret;
98 
99  s->nb_planes = av_pix_fmt_count_planes(inlink->format);
100 
101  s->has_alpha = !!(desc->flags & AV_PIX_FMT_FLAG_ALPHA);
102  if ((ret = av_image_fill_linesizes(s->linesize, inlink->format, inlink->w)) < 0)
103  return ret;
104 
105  s->chroma_height = AV_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h);
106 
107  return 0;
108 }
109 
110 static void interleave(uint8_t *dst, uint8_t *src, int w, int h,
111  int dst_linesize, int src_linesize,
112  enum FilterMode mode, int swap)
113 {
114  const int a = swap;
115  const int b = 1 - a;
116  const int m = h >> 1;
117  int y;
118 
119  switch (mode) {
120  case MODE_DEINTERLEAVE:
121  for (y = 0; y < m; y++) {
122  memcpy(dst + dst_linesize * y , src + src_linesize * (y * 2 + a), w);
123  memcpy(dst + dst_linesize * (y + m), src + src_linesize * (y * 2 + b), w);
124  }
125  break;
126  case MODE_NONE:
127  for (y = 0; y < m; y++) {
128  memcpy(dst + dst_linesize * y * 2 , src + src_linesize * (y * 2 + a), w);
129  memcpy(dst + dst_linesize * (y * 2 + 1), src + src_linesize * (y * 2 + b), w);
130  }
131  break;
132  case MODE_INTERLEAVE:
133  for (y = 0; y < m; y++) {
134  memcpy(dst + dst_linesize * (y * 2 + a), src + src_linesize * y , w);
135  memcpy(dst + dst_linesize * (y * 2 + b), src + src_linesize * (y + m), w);
136  }
137  break;
138  }
139 }
140 
141 static int filter_frame(AVFilterLink *inlink, AVFrame *inpicref)
142 {
143  IlContext *s = inlink->dst->priv;
144  AVFilterLink *outlink = inlink->dst->outputs[0];
145  AVFrame *out;
146  int comp;
147 
148  out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
149  if (!out) {
150  av_frame_free(&inpicref);
151  return AVERROR(ENOMEM);
152  }
153  av_frame_copy_props(out, inpicref);
154 
155  interleave(out->data[0], inpicref->data[0],
156  s->linesize[0], inlink->h,
157  out->linesize[0], inpicref->linesize[0],
158  s->luma_mode, s->luma_swap);
159 
160  for (comp = 1; comp < (s->nb_planes - s->has_alpha); comp++) {
161  interleave(out->data[comp], inpicref->data[comp],
162  s->linesize[comp], s->chroma_height,
163  out->linesize[comp], inpicref->linesize[comp],
164  s->chroma_mode, s->chroma_swap);
165  }
166 
167  if (s->has_alpha) {
168  comp = s->nb_planes - 1;
169  interleave(out->data[comp], inpicref->data[comp],
170  s->linesize[comp], inlink->h,
171  out->linesize[comp], inpicref->linesize[comp],
172  s->alpha_mode, s->alpha_swap);
173  }
174 
175  av_frame_free(&inpicref);
176  return ff_filter_frame(outlink, out);
177 }
178 
179 static const AVFilterPad inputs[] = {
180  {
181  .name = "default",
182  .type = AVMEDIA_TYPE_VIDEO,
183  .filter_frame = filter_frame,
184  .config_props = config_input,
185  },
186 };
187 
188 const AVFilter ff_vf_il = {
189  .name = "il",
190  .description = NULL_IF_CONFIG_SMALL("Deinterleave or interleave fields."),
191  .priv_size = sizeof(IlContext),
192  FILTER_INPUTS(inputs),
193  FILTER_OUTPUTS(ff_video_default_filterpad),
194  FILTER_QUERY_FUNC(query_formats),
195  .priv_class = &il_class,
196  .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
197  .process_command = ff_filter_process_command,
198 };
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:112
IlContext::luma_mode
int luma_mode
Definition: vf_il.c:43
IlContext::linesize
int linesize[4]
Definition: vf_il.c:46
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
comp
static void comp(unsigned char *dst, ptrdiff_t dst_stride, unsigned char *src, ptrdiff_t src_stride, int add)
Definition: eamad.c:80
ff_filter_frame
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
Definition: avfilter.c:1018
av_pix_fmt_desc_get
const AVPixFmtDescriptor * av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
Definition: pixdesc.c:2962
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:130
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:344
pixdesc.h
w
uint8_t w
Definition: llviddspenc.c:38
AVOption
AVOption.
Definition: opt.h:346
b
#define b
Definition: input.c:41
FILTER_QUERY_FUNC
#define FILTER_QUERY_FUNC(func)
Definition: internal.h:159
MODE_INTERLEAVE
@ MODE_INTERLEAVE
Definition: vf_il.c:37
AVFilter::name
const char * name
Filter name.
Definition: avfilter.h:170
ff_vf_il
const AVFilter ff_vf_il
Definition: vf_il.c:188
video.h
IlContext::alpha_swap
int alpha_swap
Definition: vf_il.c:44
AVFrame::data
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:365
formats.h
av_pix_fmt_count_planes
int av_pix_fmt_count_planes(enum AVPixelFormat pix_fmt)
Definition: pixdesc.c:3002
FilterMode
FilterMode
Definition: vp9.h:64
IlContext
Definition: vf_il.c:41
AVFILTER_DEFINE_CLASS
AVFILTER_DEFINE_CLASS(il)
AV_PIX_FMT_FLAG_HWACCEL
#define AV_PIX_FMT_FLAG_HWACCEL
Pixel format is an HW accelerated format.
Definition: pixdesc.h:128
filter_frame
static int filter_frame(AVFilterLink *inlink, AVFrame *inpicref)
Definition: vf_il.c:141
inputs
static const AVFilterPad inputs[]
Definition: vf_il.c:179
AVFilterPad
A filter pad used for either input or output.
Definition: internal.h:33
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:867
ff_video_default_filterpad
const AVFilterPad ff_video_default_filterpad[1]
An AVFilterPad array whose only entry has name "default" and is of type AVMEDIA_TYPE_VIDEO.
Definition: video.c:37
IlContext::chroma_height
int chroma_height
Definition: vf_il.c:46
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:198
MODE_DEINTERLEAVE
@ MODE_DEINTERLEAVE
Definition: vf_il.c:38
AV_CEIL_RSHIFT
#define AV_CEIL_RSHIFT(a, b)
Definition: common.h:58
config_input
static int config_input(AVFilterLink *inlink)
Definition: vf_il.c:93
AV_PIX_FMT_FLAG_ALPHA
#define AV_PIX_FMT_FLAG_ALPHA
The pixel format has an alpha channel.
Definition: pixdesc.h:147
ctx
AVFormatContext * ctx
Definition: movenc.c:48
FILTER_INPUTS
#define FILTER_INPUTS(array)
Definition: internal.h:182
MODE_NONE
@ MODE_NONE
Definition: vf_il.c:36
IlContext::has_alpha
int has_alpha
Definition: vf_il.c:47
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:679
IlContext::alpha_mode
int alpha_mode
FilterMode.
Definition: vf_il.c:43
interleave
static void interleave(uint8_t *dst, uint8_t *src, int w, int h, int dst_linesize, int src_linesize, enum FilterMode mode, int swap)
Definition: vf_il.c:110
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:106
ff_filter_process_command
int ff_filter_process_command(AVFilterContext *ctx, const char *cmd, const char *arg, char *res, int res_len, int flags)
Generic processing of user supplied commands that are set in the same way as the filter options.
Definition: avfilter.c:890
il_options
static const AVOption il_options[]
Definition: vf_il.c:53
a
The reader does not expect b to be semantically here and if the code is changed by maybe adding a a division or other the signedness will almost certainly be mistaken To avoid this confusion a new type was SUINT is the C unsigned type but it holds a signed int to use the same example SUINT a
Definition: undefined.txt:41
internal.h
AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC
#define AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC
Some filters support a generic "enable" expression option that can be used to enable or disable a fil...
Definition: avfilter.h:147
ff_formats_pixdesc_filter
AVFilterFormats * ff_formats_pixdesc_filter(unsigned want, unsigned rej)
Construct a formats list containing all pixel formats with certain properties.
Definition: formats.c:553
IlContext::chroma_swap
int chroma_swap
Definition: vf_il.c:44
AVFilterPad::name
const char * name
Pad name.
Definition: internal.h:39
AVFilter
Filter definition.
Definition: avfilter.h:166
FLAGS
#define FLAGS
Definition: vf_il.c:51
query_formats
static int query_formats(AVFilterContext *ctx)
Definition: vf_il.c:86
ret
ret
Definition: filter_design.txt:187
mode
mode
Definition: ebur128.h:83
AV_OPT_TYPE_INT
@ AV_OPT_TYPE_INT
Definition: opt.h:235
avfilter.h
AVFilterContext
An instance of a filter.
Definition: avfilter.h:407
desc
const char * desc
Definition: libsvtav1.c:75
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
IlContext::luma_swap
int luma_swap
Definition: vf_il.c:44
AVPixFmtDescriptor
Descriptor that unambiguously describes how the bits of a pixel are stored in the up to 4 data planes...
Definition: pixdesc.h:69
OFFSET
#define OFFSET(x)
Definition: vf_il.c:50
AV_OPT_TYPE_BOOL
@ AV_OPT_TYPE_BOOL
Definition: opt.h:251
FILTER_OUTPUTS
#define FILTER_OUTPUTS(array)
Definition: internal.h:183
src
INIT_CLIP pixel * src
Definition: h264pred_template.c:418
IlContext::chroma_mode
int chroma_mode
Definition: vf_il.c:43
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:389
h
h
Definition: vp9dsp_template.c:2038
IlContext::nb_planes
int nb_planes
Definition: vf_il.c:45
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:244
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