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704865f @BMintern lavfi: add fade filter
BMintern authored
1 /*
2 * Copyright (c) 2010 Brandon Mintern
3 * Copyright (c) 2007 Bobby Bingham
4 *
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michaelni authored
5 * This file is part of FFmpeg.
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6 *
2d2b5a1 @michaelni 10l, commit that should have been stashed into the merge.
michaelni authored
7 * FFmpeg is free software; you can redistribute it and/or
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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 *
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michaelni authored
12 * FFmpeg is distributed in the hope that it will be useful,
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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
2d2b5a1 @michaelni 10l, commit that should have been stashed into the merge.
michaelni authored
18 * License along with FFmpeg; if not, write to the Free Software
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19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 /**
23 * @file
24 * video fade filter
25 * based heavily on vf_negate.c by Bobby Bingham
26 */
27
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28 #include "libavutil/avstring.h"
29 #include "libavutil/eval.h"
30 #include "libavutil/opt.h"
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31 #include "libavutil/pixdesc.h"
32 #include "avfilter.h"
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33 #include "drawutils.h"
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34 #include "internal.h"
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35 #include "formats.h"
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36 #include "internal.h"
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elenril authored
37 #include "video.h"
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38
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39 #define R 0
40 #define G 1
41 #define B 2
42 #define A 3
43
44 #define Y 0
45 #define U 1
46 #define V 2
47
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48 typedef struct {
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49 const AVClass *class;
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50 int factor, fade_per_frame;
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51 unsigned int frame_index, start_frame, stop_frame, nb_frames;
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52 int hsub, vsub, bpp;
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53 unsigned int black_level, black_level_scaled;
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54 uint8_t is_packed_rgb;
55 uint8_t rgba_map[4];
56 int alpha;
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57
58 char *type;
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59 } FadeContext;
60
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61 #define OFFSET(x) offsetof(FadeContext, x)
62
63 static const AVOption fade_options[] = {
64 { "type", "set the fade direction", OFFSET(type), AV_OPT_TYPE_STRING, {.str = "in" }, CHAR_MIN, CHAR_MAX },
65 { "t", "set the fade direction", OFFSET(type), AV_OPT_TYPE_STRING, {.str = "in" }, CHAR_MIN, CHAR_MAX },
66 { "start_frame", "set expression of frame to start fading", OFFSET(start_frame), AV_OPT_TYPE_INT, {.dbl = 0 }, 0, INT_MAX },
67 { "s", "set expression of frame to start fading", OFFSET(start_frame), AV_OPT_TYPE_INT, {.dbl = 0 }, 0, INT_MAX },
68 { "nb_frames", "set expression for fade duration in frames", OFFSET(nb_frames), AV_OPT_TYPE_INT, {.dbl = 25 }, 0, INT_MAX },
69 { "n", "set expression for fade duration in frames", OFFSET(nb_frames), AV_OPT_TYPE_INT, {.dbl = 25 }, 0, INT_MAX },
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70 { "alpha", "fade alpha if it is available on the input", OFFSET(alpha), AV_OPT_TYPE_INT, {.dbl = 0 }, 0, 1 },
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71 {NULL},
72 };
73
c17808c @saste lavfi: define macro AVFILTER_DEFINE_CLASS
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74 AVFILTER_DEFINE_CLASS(fade);
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75
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76 static av_cold int init(AVFilterContext *ctx, const char *args)
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77 {
78 FadeContext *fade = ctx->priv;
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79 int ret = 0;
80 char *args1, *expr, *bufptr = NULL;
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81
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82 fade->class = &fade_class;
83 av_opt_set_defaults(fade);
84
85 if (!(args1 = av_strdup(args))) {
86 ret = AVERROR(ENOMEM);
87 goto end;
88 }
89
90 if (expr = av_strtok(args1, ":", &bufptr)) {
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91 av_free(fade->type);
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92 if (!(fade->type = av_strdup(expr))) {
93 ret = AVERROR(ENOMEM);
94 goto end;
95 }
96 }
97 if (expr = av_strtok(NULL, ":", &bufptr)) {
98 if ((ret = av_opt_set(fade, "start_frame", expr, 0)) < 0) {
99 av_log(ctx, AV_LOG_ERROR,
100 "Invalid value '%s' for start_frame option\n", expr);
101 return ret;
102 }
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103 }
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104 if (expr = av_strtok(NULL, ":", &bufptr)) {
105 if ((ret = av_opt_set(fade, "nb_frames", expr, 0)) < 0) {
106 av_log(ctx, AV_LOG_ERROR,
107 "Invalid value '%s' for nb_frames option\n", expr);
108 return ret;
109 }
110 }
111
112 if (bufptr && (ret = av_set_options_string(fade, bufptr, "=", ":")) < 0)
113 goto end;
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114
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115 fade->fade_per_frame = (1 << 16) / fade->nb_frames;
116 if (!strcmp(fade->type, "in"))
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117 fade->factor = 0;
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118 else if (!strcmp(fade->type, "out")) {
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119 fade->fade_per_frame = -fade->fade_per_frame;
120 fade->factor = (1 << 16);
121 } else {
122 av_log(ctx, AV_LOG_ERROR,
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123 "Type argument must be 'in' or 'out' but '%s' was specified\n", fade->type);
124 ret = AVERROR(EINVAL);
125 goto end;
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126 }
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127 fade->stop_frame = fade->start_frame + fade->nb_frames;
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128
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129 av_log(ctx, AV_LOG_VERBOSE,
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130 "type:%s start_frame:%d nb_frames:%d alpha:%d\n",
131 fade->type, fade->start_frame, fade->nb_frames, fade->alpha);
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132
133 end:
134 av_free(args1);
135 return ret;
136 }
137
138 static av_cold void uninit(AVFilterContext *ctx)
139 {
140 FadeContext *fade = ctx->priv;
141
142 av_freep(&fade->type);
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143 }
144
145 static int query_formats(AVFilterContext *ctx)
146 {
e44c11e @DonDiego cosmetics: Move static and inline attributes to more standard places.
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147 static const enum PixelFormat pix_fmts[] = {
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148 PIX_FMT_YUV444P, PIX_FMT_YUV422P, PIX_FMT_YUV420P,
149 PIX_FMT_YUV411P, PIX_FMT_YUV410P,
150 PIX_FMT_YUVJ444P, PIX_FMT_YUVJ422P, PIX_FMT_YUVJ420P,
151 PIX_FMT_YUV440P, PIX_FMT_YUVJ440P,
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152 PIX_FMT_YUVA420P,
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153 PIX_FMT_RGB24, PIX_FMT_BGR24,
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154 PIX_FMT_ARGB, PIX_FMT_ABGR,
155 PIX_FMT_RGBA, PIX_FMT_BGRA,
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156 PIX_FMT_NONE
157 };
158
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159 ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
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160 return 0;
161 }
162
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163 const static enum PixelFormat studio_level_pix_fmts[] = {
164 PIX_FMT_YUV444P, PIX_FMT_YUV422P, PIX_FMT_YUV420P,
165 PIX_FMT_YUV411P, PIX_FMT_YUV410P,
166 PIX_FMT_YUV440P,
167 PIX_FMT_NONE
168 };
169
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170 static enum PixelFormat alpha_pix_fmts[] = {
171 PIX_FMT_YUVA420P,
172 PIX_FMT_ARGB, PIX_FMT_ABGR,
173 PIX_FMT_RGBA, PIX_FMT_BGRA,
174 PIX_FMT_NONE
175 };
176
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177 static int config_props(AVFilterLink *inlink)
178 {
179 FadeContext *fade = inlink->dst->priv;
180 const AVPixFmtDescriptor *pixdesc = &av_pix_fmt_descriptors[inlink->format];
181
182 fade->hsub = pixdesc->log2_chroma_w;
183 fade->vsub = pixdesc->log2_chroma_h;
184
185 fade->bpp = av_get_bits_per_pixel(pixdesc) >> 3;
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186 fade->alpha = fade->alpha ? ff_fmt_is_in(inlink->format, alpha_pix_fmts) : 0;
187 fade->is_packed_rgb = ff_fill_rgba_map(fade->rgba_map, inlink->format) >= 0;
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188
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189 /* use CCIR601/709 black level for studio-level pixel non-alpha components */
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190 fade->black_level =
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191 ff_fmt_is_in(inlink->format, studio_level_pix_fmts) && !fade->alpha ? 16 : 0;
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192 /* 32768 = 1 << 15, it is an integer representation
193 * of 0.5 and is for rounding. */
194 fade->black_level_scaled = (fade->black_level << 16) + 32768;
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195 return 0;
196 }
197
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198 static void fade_plane(int y, int h, int w,
199 int fade_factor, int black_level, int black_level_scaled,
200 uint8_t offset, uint8_t step, int bytes_per_plane,
201 uint8_t *data, int line_size)
202 {
203 uint8_t *p;
204 int i, j;
205
206 /* luma, alpha or rgb plane */
207 for (i = 0; i < h; i++) {
208 p = data + offset + (y+i) * line_size;
209 for (j = 0; j < w * bytes_per_plane; j++) {
210 /* fade->factor is using 16 lower-order bits for decimal places. */
211 *p = ((*p - black_level) * fade_factor + black_level_scaled) >> 16;
212 p+=step;
213 }
214 }
215 }
216
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217 static int draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
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218 {
219 FadeContext *fade = inlink->dst->priv;
220 AVFilterBufferRef *outpic = inlink->cur_buf;
221 uint8_t *p;
222 int i, j, plane;
223
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224 if (fade->factor < UINT16_MAX) {
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225 if (fade->alpha) {
226 // alpha only
227 plane = fade->is_packed_rgb ? 0 : A; // alpha is on plane 0 for packed formats
228 // or plane 3 for planar formats
229 fade_plane(y, h, inlink->w,
230 fade->factor, fade->black_level, fade->black_level_scaled,
231 fade->is_packed_rgb ? fade->rgba_map[A] : 0, // alpha offset for packed formats
232 fade->is_packed_rgb ? 4 : 1, // pixstep for 8 bit packed formats
233 1, outpic->data[plane], outpic->linesize[plane]);
234 } else {
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235 /* luma or rgb plane */
236 fade_plane(y, h, inlink->w,
237 fade->factor, fade->black_level, fade->black_level_scaled,
238 0, 1, // offset & pixstep for Y plane or RGB packed format
239 fade->bpp, outpic->data[0], outpic->linesize[0]);
240 if (outpic->data[1] && outpic->data[2]) {
241 /* chroma planes */
242 for (plane = 1; plane < 3; plane++) {
243 for (i = 0; i < h; i++) {
244 p = outpic->data[plane] + ((y+i) >> fade->vsub) * outpic->linesize[plane];
245 for (j = 0; j < inlink->w >> fade->hsub; j++) {
246 /* 8421367 = ((128 << 1) + 1) << 15. It is an integer
247 * representation of 128.5. The .5 is for rounding
248 * purposes. */
249 *p = ((*p - 128) * fade->factor + 8421367) >> 16;
250 p++;
251 }
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252 }
253 }
254 }
255 }
256 }
257
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258 return ff_draw_slice(inlink->dst->outputs[0], y, h, slice_dir);
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259 }
260
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261 static int end_frame(AVFilterLink *inlink)
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262 {
263 FadeContext *fade = inlink->dst->priv;
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264 int ret;
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265
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266 ret = ff_end_frame(inlink->dst->outputs[0]);
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267
268 if (fade->frame_index >= fade->start_frame &&
269 fade->frame_index <= fade->stop_frame)
270 fade->factor += fade->fade_per_frame;
271 fade->factor = av_clip_uint16(fade->factor);
272 fade->frame_index++;
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273
274 return ret;
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275 }
276
277 AVFilter avfilter_vf_fade = {
278 .name = "fade",
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279 .description = NULL_IF_CONFIG_SMALL("Fade in/out input video."),
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280 .init = init,
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281 .uninit = uninit,
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282 .priv_size = sizeof(FadeContext),
283 .query_formats = query_formats,
284
3db4070 @rbultje lavfi: use const for AVFilterPad declarations in all filters.
rbultje authored
285 .inputs = (const AVFilterPad[]) {{ .name = "default",
286 .type = AVMEDIA_TYPE_VIDEO,
287 .config_props = config_props,
288 .get_video_buffer = ff_null_get_video_buffer,
289 .start_frame = ff_null_start_frame,
290 .draw_slice = draw_slice,
291 .end_frame = end_frame,
292 .min_perms = AV_PERM_READ | AV_PERM_WRITE,
293 .rej_perms = AV_PERM_PRESERVE, },
294 { .name = NULL}},
295 .outputs = (const AVFilterPad[]) {{ .name = "default",
296 .type = AVMEDIA_TYPE_VIDEO, },
297 { .name = NULL}},
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298 };
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