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* Copyright (c) 2010 Brandon Mintern
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* Copyright (c) 2007 Bobby Bingham
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* This file is part of Libav.
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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* based heavily on vf_negate.c by Bobby Bingham
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#include "libavutil/pixdesc.h"
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int factor, fade_per_frame;
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unsigned int frame_index, start_frame, stop_frame;
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static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
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FadeContext *fade = ctx->priv;
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unsigned int nb_frames;
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sscanf(args, " %3[^:]:%u:%u", in_out, &fade->start_frame, &nb_frames) != 3) {
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av_log(ctx, AV_LOG_ERROR,
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"Expected 3 arguments '(in|out):#:#':'%s'\n", args);
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return AVERROR(EINVAL);
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nb_frames = nb_frames ? nb_frames : 1;
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fade->fade_per_frame = (1 << 16) / nb_frames;
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if (!strcmp(in_out, "in"))
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else if (!strcmp(in_out, "out")) {
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fade->fade_per_frame = -fade->fade_per_frame;
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fade->factor = (1 << 16);
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av_log(ctx, AV_LOG_ERROR,
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"first argument must be 'in' or 'out':'%s'\n", in_out);
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return AVERROR(EINVAL);
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fade->stop_frame = fade->start_frame + nb_frames;
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av_log(ctx, AV_LOG_INFO,
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"type:%s start_frame:%d nb_frames:%d\n",
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in_out, fade->start_frame, nb_frames);
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static int query_formats(AVFilterContext *ctx)
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const static enum PixelFormat pix_fmts[] = {
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PIX_FMT_YUV444P, PIX_FMT_YUV422P, PIX_FMT_YUV420P,
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PIX_FMT_YUV411P, PIX_FMT_YUV410P,
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PIX_FMT_YUVJ444P, PIX_FMT_YUVJ422P, PIX_FMT_YUVJ420P,
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PIX_FMT_YUV440P, PIX_FMT_YUVJ440P,
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PIX_FMT_RGB24, PIX_FMT_BGR24,
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avfilter_set_common_formats(ctx, avfilter_make_format_list(pix_fmts));
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static int config_props(AVFilterLink *inlink)
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FadeContext *fade = inlink->dst->priv;
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const AVPixFmtDescriptor *pixdesc = &av_pix_fmt_descriptors[inlink->format];
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fade->hsub = pixdesc->log2_chroma_w;
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fade->vsub = pixdesc->log2_chroma_h;
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fade->bpp = av_get_bits_per_pixel(pixdesc) >> 3;
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static void draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
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FadeContext *fade = inlink->dst->priv;
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AVFilterBufferRef *outpic = inlink->cur_buf;
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if (fade->factor < 65536) {
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/* luma or rgb plane */
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for (i = 0; i < h; i++) {
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p = outpic->data[0] + (y+i) * outpic->linesize[0];
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for (j = 0; j < inlink->w * fade->bpp; j++) {
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/* fade->factor is using 16 lower-order bits for decimal
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* places. 32768 = 1 << 15, it is an integer representation
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* of 0.5 and is for rounding. */
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*p = (*p * fade->factor + 32768) >> 16;
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if (outpic->data[0] && outpic->data[1]) {
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for (plane = 1; plane < 3; plane++) {
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for (i = 0; i < h; i++) {
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p = outpic->data[plane] + ((y+i) >> fade->vsub) * outpic->linesize[plane];
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for (j = 0; j < inlink->w >> fade->hsub; j++) {
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/* 8421367 = ((128 << 1) + 1) << 15. It is an integer
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* representation of 128.5. The .5 is for rounding
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*p = ((*p - 128) * fade->factor + 8421367) >> 16;
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avfilter_draw_slice(inlink->dst->outputs[0], y, h, slice_dir);
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static void end_frame(AVFilterLink *inlink)
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FadeContext *fade = inlink->dst->priv;
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avfilter_end_frame(inlink->dst->outputs[0]);
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if (fade->frame_index >= fade->start_frame &&
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fade->frame_index <= fade->stop_frame)
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fade->factor += fade->fade_per_frame;
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fade->factor = av_clip_uint16(fade->factor);
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AVFilter avfilter_vf_fade = {
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.description = NULL_IF_CONFIG_SMALL("Fade in/out input video"),
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.priv_size = sizeof(FadeContext),
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.query_formats = query_formats,
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.inputs = (AVFilterPad[]) {{ .name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.config_props = config_props,
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.get_video_buffer = avfilter_null_get_video_buffer,
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.start_frame = avfilter_null_start_frame,
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.draw_slice = draw_slice,
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.end_frame = end_frame,
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.min_perms = AV_PERM_READ | AV_PERM_WRITE,
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.rej_perms = AV_PERM_PRESERVE, },
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.outputs = (AVFilterPad[]) {{ .name = "default",
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.type = AVMEDIA_TYPE_VIDEO, },