h264_metadata: Add option to delete filler data
[libav.git] / libavfilter / vf_fade.c
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1/*
2 * Copyright (c) 2010 Brandon Mintern
3 * Copyright (c) 2007 Bobby Bingham
4 *
6001dad6 5 * This file is part of Libav.
aadfc9ee 6 *
6001dad6 7 * Libav 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 *
6001dad6 12 * Libav 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
6001dad6 18 * License along with Libav; 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
1d9c2dc8 28#include "libavutil/common.h"
b9dfee9f 29#include "libavutil/opt.h"
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30#include "libavutil/pixdesc.h"
31#include "avfilter.h"
b74a1da4 32#include "formats.h"
9d0bfc50 33#include "internal.h"
c04c533f 34#include "video.h"
aadfc9ee 35
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36#define FADE_IN 0
37#define FADE_OUT 1
38
58400ac1 39typedef struct FadeContext {
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40 const AVClass *class;
41 int type;
aadfc9ee 42 int factor, fade_per_frame;
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43 int start_frame, nb_frames;
44 unsigned int frame_index, stop_frame;
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45 int hsub, vsub, bpp;
46} FadeContext;
47
c43a7eca 48static av_cold int init(AVFilterContext *ctx)
aadfc9ee 49{
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50 FadeContext *s = ctx->priv;
51
52 s->fade_per_frame = (1 << 16) / s->nb_frames;
53 if (s->type == FADE_IN) {
54 s->factor = 0;
55 } else if (s->type == FADE_OUT) {
56 s->fade_per_frame = -s->fade_per_frame;
57 s->factor = (1 << 16);
aadfc9ee 58 }
c0279956 59 s->stop_frame = s->start_frame + s->nb_frames;
aadfc9ee 60
1a49a169 61 av_log(ctx, AV_LOG_VERBOSE,
aadfc9ee 62 "type:%s start_frame:%d nb_frames:%d\n",
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63 s->type == FADE_IN ? "in" : "out", s->start_frame,
64 s->nb_frames);
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65 return 0;
66}
67
68static int query_formats(AVFilterContext *ctx)
69{
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70 static const enum AVPixelFormat pix_fmts[] = {
71 AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV420P,
72 AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV410P,
73 AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ420P,
74 AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUVJ440P,
75 AV_PIX_FMT_RGB24, AV_PIX_FMT_BGR24,
76 AV_PIX_FMT_NONE
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77 };
78
b74a1da4 79 ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
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80 return 0;
81}
82
83static int config_props(AVFilterLink *inlink)
84{
c0279956 85 FadeContext *s = inlink->dst->priv;
59ee9f78 86 const AVPixFmtDescriptor *pixdesc = av_pix_fmt_desc_get(inlink->format);
aadfc9ee 87
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88 s->hsub = pixdesc->log2_chroma_w;
89 s->vsub = pixdesc->log2_chroma_h;
aadfc9ee 90
c0279956 91 s->bpp = av_get_bits_per_pixel(pixdesc) >> 3;
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92 return 0;
93}
94
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95static int filter_slice_luma(AVFilterContext *ctx, void *arg, int jobnr,
96 int nb_jobs)
aadfc9ee 97{
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98 FadeContext *s = ctx->priv;
99 AVFrame *frame = arg;
100 int slice_h = frame->height / nb_jobs;
101 int slice_start = jobnr * slice_h;
102 int slice_end = (jobnr == nb_jobs - 1) ? frame->height : (jobnr + 1) * slice_h;
103 int i, j;
104
105 for (i = slice_start; i < slice_end; i++) {
106 uint8_t *p = frame->data[0] + i * frame->linesize[0];
107 for (j = 0; j < frame->width * s->bpp; j++) {
108 /* s->factor is using 16 lower-order bits for decimal
109 * places. 32768 = 1 << 15, it is an integer representation
110 * of 0.5 and is for rounding. */
111 *p = (*p * s->factor + 32768) >> 16;
112 p++;
113 }
114 }
115
116 return 0;
117}
118
119static int filter_slice_chroma(AVFilterContext *ctx, void *arg, int jobnr,
120 int nb_jobs)
121{
122 FadeContext *s = ctx->priv;
123 AVFrame *frame = arg;
124 int slice_h = FFALIGN(frame->height / nb_jobs, 1 << s->vsub);
125 int slice_start = jobnr * slice_h;
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126 int slice_end = (jobnr == nb_jobs - 1) ? frame->height :
127 FFMIN((jobnr + 1) * slice_h, frame->height);
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128 int i, j, plane;
129
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130 for (plane = 1; plane < 3; plane++) {
131 for (i = slice_start; i < slice_end; i++) {
132 uint8_t *p = frame->data[plane] + (i >> s->vsub) * frame->linesize[plane];
133 for (j = 0; j < frame->width >> s->hsub; j++) {
134 /* 8421367 = ((128 << 1) + 1) << 15. It is an integer
135 * representation of 128.5. The .5 is for rounding
136 * purposes. */
137 *p = ((*p - 128) * s->factor + 8421367) >> 16;
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138 p++;
139 }
140 }
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141 }
142
143 return 0;
144}
145
146static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
147{
148 AVFilterContext *ctx = inlink->dst;
149 FadeContext *s = ctx->priv;
150
151 if (s->factor < UINT16_MAX) {
152 /* luma or rgb plane */
153 ctx->internal->execute(ctx, filter_slice_luma, frame, NULL,
154 FFMIN(frame->height, ctx->graph->nb_threads));
aadfc9ee 155
565e4993 156 if (frame->data[1] && frame->data[2]) {
aadfc9ee 157 /* chroma planes */
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158 ctx->internal->execute(ctx, filter_slice_chroma, frame, NULL,
159 FFMIN(frame->height, ctx->graph->nb_threads));
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160 }
161 }
162
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163 if (s->frame_index >= s->start_frame &&
164 s->frame_index <= s->stop_frame)
165 s->factor += s->fade_per_frame;
166 s->factor = av_clip_uint16(s->factor);
167 s->frame_index++;
d4f89906 168
565e4993 169 return ff_filter_frame(inlink->dst->outputs[0], frame);
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170}
171
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172#define OFFSET(x) offsetof(FadeContext, x)
173#define FLAGS AV_OPT_FLAG_VIDEO_PARAM
174static const AVOption options[] = {
175 { "type", "'in' or 'out' for fade-in/fade-out", OFFSET(type), AV_OPT_TYPE_INT, { .i64 = FADE_IN }, FADE_IN, FADE_OUT, FLAGS, "type" },
176 { "in", "fade-in", 0, AV_OPT_TYPE_CONST, { .i64 = FADE_IN }, .unit = "type" },
177 { "out", "fade-out", 0, AV_OPT_TYPE_CONST, { .i64 = FADE_OUT }, .unit = "type" },
178 { "start_frame", "Number of the first frame to which to apply the effect.",
179 OFFSET(start_frame), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, FLAGS },
180 { "nb_frames", "Number of frames to which the effect should be applied.",
181 OFFSET(nb_frames), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, INT_MAX, FLAGS },
182 { NULL },
183};
184
185static const AVClass fade_class = {
186 .class_name = "fade",
187 .item_name = av_default_item_name,
188 .option = options,
189 .version = LIBAVUTIL_VERSION_INT,
190};
191
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192static const AVFilterPad avfilter_vf_fade_inputs[] = {
193 {
194 .name = "default",
195 .type = AVMEDIA_TYPE_VIDEO,
196 .config_props = config_props,
197 .get_video_buffer = ff_null_get_video_buffer,
565e4993 198 .filter_frame = filter_frame,
7e350379 199 .needs_writable = 1,
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200 },
201 { NULL }
202};
203
204static const AVFilterPad avfilter_vf_fade_outputs[] = {
205 {
206 .name = "default",
207 .type = AVMEDIA_TYPE_VIDEO,
208 },
209 { NULL }
210};
211
cd43ca04 212AVFilter ff_vf_fade = {
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213 .name = "fade",
214 .description = NULL_IF_CONFIG_SMALL("Fade in/out input video"),
215 .init = init,
216 .priv_size = sizeof(FadeContext),
b9dfee9f 217 .priv_class = &fade_class,
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218 .query_formats = query_formats,
219
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220 .inputs = avfilter_vf_fade_inputs,
221 .outputs = avfilter_vf_fade_outputs,
8a994b74 222 .flags = AVFILTER_FLAG_SLICE_THREADS,
aadfc9ee 223};