FFmpeg  4.4.4
vf_alphamerge.c
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1 /*
2  * Copyright (c) 2012 Steven Robertson
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  * copy an alpha component from another video's luma
24  */
25 
26 #include <string.h>
27 
28 #include "libavutil/imgutils.h"
29 #include "libavutil/opt.h"
30 #include "libavutil/pixfmt.h"
31 #include "avfilter.h"
32 #include "drawutils.h"
33 #include "formats.h"
34 #include "filters.h"
35 #include "framesync.h"
36 #include "internal.h"
37 #include "video.h"
38 
39 enum { Y, U, V, A };
40 
41 typedef struct AlphaMergeContext {
42  const AVClass *class;
43 
46 
49 
51 {
52  AVFilterContext *ctx = fs->parent;
53  AlphaMergeContext *s = ctx->priv;
54  AVFrame *main_buf, *alpha_buf;
55  int ret;
56 
57  ret = ff_framesync_dualinput_get_writable(fs, &main_buf, &alpha_buf);
58  if (ret < 0)
59  return ret;
60  if (!alpha_buf)
61  return ff_filter_frame(ctx->outputs[0], main_buf);
62 
63  if (s->is_packed_rgb) {
64  int x, y;
65  uint8_t *pin, *pout;
66  for (y = 0; y < main_buf->height; y++) {
67  pin = alpha_buf->data[0] + y * alpha_buf->linesize[0];
68  pout = main_buf->data[0] + y * main_buf->linesize[0] + s->rgba_map[A];
69  for (x = 0; x < main_buf->width; x++) {
70  *pout = *pin;
71  pin += 1;
72  pout += 4;
73  }
74  }
75  } else {
76  const int main_linesize = main_buf->linesize[A];
77  const int alpha_linesize = alpha_buf->linesize[Y];
78  av_image_copy_plane(main_buf->data[A], main_linesize,
79  alpha_buf->data[Y], alpha_linesize,
80  FFMIN(main_linesize, alpha_linesize), alpha_buf->height);
81  }
82 
83  return ff_filter_frame(ctx->outputs[0], main_buf);
84 }
85 
87 {
88  AlphaMergeContext *s = ctx->priv;
89 
90  s->fs.on_event = do_alphamerge;
91  return 0;
92 }
93 
95 {
96  static const enum AVPixelFormat main_fmts[] = {
101  };
102  static const enum AVPixelFormat alpha_fmts[] = { AV_PIX_FMT_GRAY8, AV_PIX_FMT_NONE };
103  AVFilterFormats *main_formats = ff_make_format_list(main_fmts);
104  int ret;
105 
106  if ((ret = ff_formats_ref(main_formats, &ctx->inputs[0]->outcfg.formats)) < 0 ||
107  (ret = ff_formats_ref(main_formats, &ctx->outputs[0]->incfg.formats)) < 0)
108  return ret;
109 
110  return ff_formats_ref(ff_make_format_list(alpha_fmts),
111  &ctx->inputs[1]->outcfg.formats);
112 }
113 
114 static int config_input_main(AVFilterLink *inlink)
115 {
116  AlphaMergeContext *s = inlink->dst->priv;
117  s->is_packed_rgb =
118  ff_fill_rgba_map(s->rgba_map, inlink->format) >= 0 &&
119  inlink->format != AV_PIX_FMT_GBRAP;
120  return 0;
121 }
122 
123 static int config_output(AVFilterLink *outlink)
124 {
125  AVFilterContext *ctx = outlink->src;
126  AlphaMergeContext *s = ctx->priv;
127  AVFilterLink *mainlink = ctx->inputs[0];
128  AVFilterLink *alphalink = ctx->inputs[1];
129  int ret;
130 
131  if (mainlink->w != alphalink->w || mainlink->h != alphalink->h) {
133  "Input frame sizes do not match (%dx%d vs %dx%d).\n",
134  mainlink->w, mainlink->h,
135  alphalink->w, alphalink->h);
136  return AVERROR(EINVAL);
137  }
138 
139  if ((ret = ff_framesync_init_dualinput(&s->fs, ctx)) < 0)
140  return ret;
141 
142  outlink->w = mainlink->w;
143  outlink->h = mainlink->h;
144  outlink->time_base = mainlink->time_base;
145  outlink->sample_aspect_ratio = mainlink->sample_aspect_ratio;
146  outlink->frame_rate = mainlink->frame_rate;
147 
148  return ff_framesync_configure(&s->fs);
149 }
150 
152 {
153  AlphaMergeContext *s = ctx->priv;
154  return ff_framesync_activate(&s->fs);
155 }
156 
158 {
159  AlphaMergeContext *s = ctx->priv;
160 
161  ff_framesync_uninit(&s->fs);
162 }
163 
164 static const AVFilterPad alphamerge_inputs[] = {
165  {
166  .name = "main",
167  .type = AVMEDIA_TYPE_VIDEO,
168  .config_props = config_input_main,
169  },{
170  .name = "alpha",
171  .type = AVMEDIA_TYPE_VIDEO,
172  },
173  { NULL }
174 };
175 
176 static const AVFilterPad alphamerge_outputs[] = {
177  {
178  .name = "default",
179  .type = AVMEDIA_TYPE_VIDEO,
180  .config_props = config_output,
181  },
182  { NULL }
183 };
184 
185 static const AVOption alphamerge_options[] = {
186  { NULL }
187 };
188 
190 
192  .name = "alphamerge",
193  .description = NULL_IF_CONFIG_SMALL("Copy the luma value of the second "
194  "input into the alpha channel of the first input."),
195  .preinit = alphamerge_framesync_preinit,
196  .priv_size = sizeof(AlphaMergeContext),
197  .priv_class = &alphamerge_class,
198  .init = init,
202  .uninit = uninit,
203  .activate = activate,
205 };
static const AVFilterPad inputs[]
Definition: af_acontrast.c:193
static const AVFilterPad outputs[]
Definition: af_acontrast.c:203
#define av_cold
Definition: attributes.h:88
uint8_t
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
Definition: avfilter.c:1096
Main libavfilter public API header.
#define flags(name, subs,...)
Definition: cbs_av1.c:561
#define s(width, name)
Definition: cbs_vp9.c:257
#define fs(width, name, subs,...)
Definition: cbs_vp9.c:259
#define FFMIN(a, b)
Definition: common.h:105
#define NULL
Definition: coverity.c:32
int ff_fill_rgba_map(uint8_t *rgba_map, enum AVPixelFormat pix_fmt)
Definition: drawutils.c:35
misc drawing utilities
int ff_formats_ref(AVFilterFormats *f, AVFilterFormats **ref)
Add ref as a new reference to formats.
Definition: formats.c:466
AVFilterFormats * ff_make_format_list(const int *fmts)
Create a list of supported formats.
Definition: formats.c:286
int ff_framesync_configure(FFFrameSync *fs)
Configure a frame sync structure.
Definition: framesync.c:124
int ff_framesync_activate(FFFrameSync *fs)
Examine the frames in the filter's input and try to produce output.
Definition: framesync.c:341
int ff_framesync_init_dualinput(FFFrameSync *fs, AVFilterContext *parent)
Initialize a frame sync structure for dualinput.
Definition: framesync.c:358
void ff_framesync_uninit(FFFrameSync *fs)
Free all memory currently allocated.
Definition: framesync.c:290
int ff_framesync_dualinput_get_writable(FFFrameSync *fs, AVFrame **f0, AVFrame **f1)
Same as ff_framesync_dualinput_get(), but make sure that f0 is writable.
Definition: framesync.c:396
#define AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL
Same as AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC, except that the filter will have its filter_frame() c...
Definition: avfilter.h:134
#define AVERROR(e)
Definition: error.h:43
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:194
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
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:373
misc image utilities
common internal API header
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
AVOptions.
pixel format definitions
AVPixelFormat
Pixel format.
Definition: pixfmt.h:64
@ AV_PIX_FMT_NONE
Definition: pixfmt.h:65
@ AV_PIX_FMT_ARGB
packed ARGB 8:8:8:8, 32bpp, ARGBARGB...
Definition: pixfmt.h:92
@ AV_PIX_FMT_BGRA
packed BGRA 8:8:8:8, 32bpp, BGRABGRA...
Definition: pixfmt.h:95
@ AV_PIX_FMT_GRAY8
Y , 8bpp.
Definition: pixfmt.h:74
@ AV_PIX_FMT_ABGR
packed ABGR 8:8:8:8, 32bpp, ABGRABGR...
Definition: pixfmt.h:94
@ AV_PIX_FMT_YUVA420P
planar YUV 4:2:0, 20bpp, (1 Cr & Cb sample per 2x2 Y & A samples)
Definition: pixfmt.h:101
@ AV_PIX_FMT_RGBA
packed RGBA 8:8:8:8, 32bpp, RGBARGBA...
Definition: pixfmt.h:93
@ AV_PIX_FMT_YUVA444P
planar YUV 4:4:4 32bpp, (1 Cr & Cb sample per 1x1 Y & A samples)
Definition: pixfmt.h:177
@ AV_PIX_FMT_GBRAP
planar GBRA 4:4:4:4 32bpp
Definition: pixfmt.h:215
@ AV_PIX_FMT_YUVA422P
planar YUV 4:2:2 24bpp, (1 Cr & Cb sample per 2x1 Y & A samples)
Definition: pixfmt.h:176
Describe the class of an AVClass context structure.
Definition: log.h:67
An instance of a filter.
Definition: avfilter.h:341
void * priv
private data for use by the filter
Definition: avfilter.h:356
A list of supported formats for one end of a filter link.
Definition: formats.h:65
A filter pad used for either input or output.
Definition: internal.h:54
const char * name
Pad name.
Definition: internal.h:60
Filter definition.
Definition: avfilter.h:145
const char * name
Filter name.
Definition: avfilter.h:149
This structure describes decoded (raw) audio or video data.
Definition: frame.h:318
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:332
int width
Definition: frame.h:376
int height
Definition: frame.h:376
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:349
AVOption.
Definition: opt.h:248
uint8_t rgba_map[4]
Definition: vf_alphamerge.c:45
FFFrameSync fs
Definition: vf_alphamerge.c:47
Frame sync structure.
Definition: framesync.h:146
#define av_log(a,...)
AVFormatContext * ctx
Definition: movenc.c:48
static const AVFilterPad alphamerge_inputs[]
static int do_alphamerge(FFFrameSync *fs)
Definition: vf_alphamerge.c:50
@ V
Definition: vf_alphamerge.c:39
@ A
Definition: vf_alphamerge.c:39
@ Y
Definition: vf_alphamerge.c:39
@ U
Definition: vf_alphamerge.c:39
static int query_formats(AVFilterContext *ctx)
Definition: vf_alphamerge.c:94
static const AVOption alphamerge_options[]
static int config_input_main(AVFilterLink *inlink)
FRAMESYNC_DEFINE_CLASS(alphamerge, AlphaMergeContext, fs)
static int activate(AVFilterContext *ctx)
static av_cold int init(AVFilterContext *ctx)
Definition: vf_alphamerge.c:86
static av_cold void uninit(AVFilterContext *ctx)
static const AVFilterPad alphamerge_outputs[]
static int config_output(AVFilterLink *outlink)
AVFilter ff_vf_alphamerge