317 lines
12 KiB
C
317 lines
12 KiB
C
/*
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* Copyright (c) 2010 Brandon Mintern
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* Copyright (c) 2007 Bobby Bingham
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg 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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*
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* FFmpeg 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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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; 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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*/
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/**
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* @file
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* video fade filter
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* based heavily on vf_negate.c by Bobby Bingham
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*/
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#include "libavutil/avstring.h"
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#include "libavutil/common.h"
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#include "libavutil/eval.h"
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#include "libavutil/opt.h"
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#include "libavutil/pixdesc.h"
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#include "avfilter.h"
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#include "drawutils.h"
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#include "internal.h"
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#include "formats.h"
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#include "internal.h"
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#include "video.h"
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#define R 0
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#define G 1
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#define B 2
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#define A 3
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#define Y 0
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#define U 1
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#define V 2
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#define FADE_IN 0
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#define FADE_OUT 1
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typedef struct {
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const AVClass *class;
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int type;
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int factor, fade_per_frame;
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int start_frame, nb_frames;
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unsigned int frame_index;
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int hsub, vsub, bpp;
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unsigned int black_level, black_level_scaled;
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uint8_t is_packed_rgb;
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uint8_t rgba_map[4];
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int alpha;
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uint64_t start_time, duration;
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enum {VF_FADE_WAITING=0, VF_FADE_FADING, VF_FADE_DONE} fade_state;
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} FadeContext;
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static av_cold int init(AVFilterContext *ctx)
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{
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FadeContext *fade = ctx->priv;
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fade->fade_per_frame = (1 << 16) / fade->nb_frames;
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fade->fade_state = VF_FADE_WAITING;
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if (fade->duration != 0) {
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// If duration (seconds) is non-zero, assume that we are not fading based on frames
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fade->nb_frames = 0; // Mostly to clean up logging
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}
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// Choose what to log. If both time-based and frame-based options, both lines will be in the log
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if (fade->start_frame || fade->nb_frames) {
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av_log(ctx, AV_LOG_VERBOSE,
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"type:%s start_frame:%d nb_frames:%d alpha:%d\n",
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fade->type == FADE_IN ? "in" : "out", fade->start_frame,
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fade->nb_frames,fade->alpha);
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}
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if (fade->start_time || fade->duration) {
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av_log(ctx, AV_LOG_VERBOSE,
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"type:%s start_time:%f duration:%f alpha:%d\n",
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fade->type == FADE_IN ? "in" : "out", (fade->start_time / (double)AV_TIME_BASE),
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(fade->duration / (double)AV_TIME_BASE),fade->alpha);
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}
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return 0;
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}
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static int query_formats(AVFilterContext *ctx)
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{
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static const enum AVPixelFormat pix_fmts[] = {
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AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV420P,
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AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV410P,
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AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ420P,
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AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUVJ440P,
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AV_PIX_FMT_YUVA420P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA444P,
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AV_PIX_FMT_RGB24, AV_PIX_FMT_BGR24,
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AV_PIX_FMT_ARGB, AV_PIX_FMT_ABGR,
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AV_PIX_FMT_RGBA, AV_PIX_FMT_BGRA,
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AV_PIX_FMT_NONE
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};
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ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
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return 0;
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}
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const static enum AVPixelFormat studio_level_pix_fmts[] = {
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AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV420P,
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AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV410P,
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AV_PIX_FMT_YUV440P,
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AV_PIX_FMT_NONE
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};
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static int config_props(AVFilterLink *inlink)
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{
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FadeContext *fade = inlink->dst->priv;
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const AVPixFmtDescriptor *pixdesc = av_pix_fmt_desc_get(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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fade->alpha &= pixdesc->flags & PIX_FMT_ALPHA;
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fade->is_packed_rgb = ff_fill_rgba_map(fade->rgba_map, inlink->format) >= 0;
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/* use CCIR601/709 black level for studio-level pixel non-alpha components */
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fade->black_level =
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ff_fmt_is_in(inlink->format, studio_level_pix_fmts) && !fade->alpha ? 16 : 0;
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/* 32768 = 1 << 15, it is an integer representation
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* of 0.5 and is for rounding. */
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fade->black_level_scaled = (fade->black_level << 16) + 32768;
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return 0;
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}
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static void fade_plane(int y, int h, int w,
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int fade_factor, int black_level, int black_level_scaled,
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uint8_t offset, uint8_t step, int bytes_per_plane,
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uint8_t *data, int line_size)
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{
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uint8_t *p;
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int i, j;
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/* luma, alpha or rgb plane */
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for (i = 0; i < h; i++) {
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p = data + offset + (y+i) * line_size;
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for (j = 0; j < w * bytes_per_plane; j++) {
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/* fade->factor is using 16 lower-order bits for decimal places. */
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*p = ((*p - black_level) * fade_factor + black_level_scaled) >> 16;
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p+=step;
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}
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}
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}
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static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
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{
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FadeContext *fade = inlink->dst->priv;
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uint8_t *p;
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int i, j, plane;
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double frame_timestamp = frame->pts == AV_NOPTS_VALUE ? -1 : frame->pts * av_q2d(inlink->time_base);
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// Calculate Fade assuming this is a Fade In
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if (fade->fade_state == VF_FADE_WAITING) {
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fade->factor=0;
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if ((frame_timestamp >= (fade->start_time/(double)AV_TIME_BASE))
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&& (fade->frame_index >= fade->start_frame)) {
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// Time to start fading
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fade->fade_state = VF_FADE_FADING;
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// Save start time in case we are starting based on frames and fading based on time
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if ((fade->start_time == 0) && (fade->start_frame != 0)) {
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fade->start_time = frame_timestamp*(double)AV_TIME_BASE;
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}
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// Save start frame in case we are starting based on time and fading based on frames
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if ((fade->start_time != 0) && (fade->start_frame == 0)) {
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fade->start_frame = fade->frame_index;
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}
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}
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}
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if (fade->fade_state == VF_FADE_FADING) {
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if (fade->duration == 0) {
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// Fading based on frame count
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fade->factor = (fade->frame_index - fade->start_frame) * fade->fade_per_frame;
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if (fade->frame_index > (fade->start_frame + fade->nb_frames)) {
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fade->fade_state = VF_FADE_DONE;
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}
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} else {
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// Fading based on duration
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fade->factor = (frame_timestamp - (fade->start_time/(double)AV_TIME_BASE))
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* (float) UINT16_MAX / (fade->duration/(double)AV_TIME_BASE);
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if (frame_timestamp > ((fade->start_time/(double)AV_TIME_BASE)
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+ (fade->duration/(double)AV_TIME_BASE))) {
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fade->fade_state = VF_FADE_DONE;
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}
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}
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}
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if (fade->fade_state == VF_FADE_DONE) {
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fade->factor=UINT16_MAX;
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}
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fade->factor = av_clip_uint16(fade->factor);
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// Invert fade_factor if Fading Out
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if (fade->type == 1) {
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fade->factor=UINT16_MAX-fade->factor;
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}
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if (fade->factor < UINT16_MAX) {
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if (fade->alpha) {
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// alpha only
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plane = fade->is_packed_rgb ? 0 : A; // alpha is on plane 0 for packed formats
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// or plane 3 for planar formats
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fade_plane(0, frame->height, inlink->w,
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fade->factor, fade->black_level, fade->black_level_scaled,
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fade->is_packed_rgb ? fade->rgba_map[A] : 0, // alpha offset for packed formats
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fade->is_packed_rgb ? 4 : 1, // pixstep for 8 bit packed formats
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1, frame->data[plane], frame->linesize[plane]);
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} else {
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/* luma or rgb plane */
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fade_plane(0, frame->height, inlink->w,
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fade->factor, fade->black_level, fade->black_level_scaled,
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0, 1, // offset & pixstep for Y plane or RGB packed format
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fade->bpp, frame->data[0], frame->linesize[0]);
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if (frame->data[1] && frame->data[2]) {
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/* chroma planes */
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for (plane = 1; plane < 3; plane++) {
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for (i = 0; i < frame->height; i++) {
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p = frame->data[plane] + (i >> fade->vsub) * frame->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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* purposes. */
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*p = ((*p - 128) * fade->factor + 8421367) >> 16;
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p++;
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}
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}
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}
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}
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}
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}
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fade->frame_index++;
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return ff_filter_frame(inlink->dst->outputs[0], frame);
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}
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#define OFFSET(x) offsetof(FadeContext, x)
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#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
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static const AVOption fade_options[] = {
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{ "type", "'in' or 'out' for fade-in/fade-out", OFFSET(type), AV_OPT_TYPE_INT, { .i64 = FADE_IN }, FADE_IN, FADE_OUT, FLAGS, "type" },
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{ "t", "'in' or 'out' for fade-in/fade-out", OFFSET(type), AV_OPT_TYPE_INT, { .i64 = FADE_IN }, FADE_IN, FADE_OUT, FLAGS, "type" },
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{ "in", "fade-in", 0, AV_OPT_TYPE_CONST, { .i64 = FADE_IN }, .unit = "type" },
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{ "out", "fade-out", 0, AV_OPT_TYPE_CONST, { .i64 = FADE_OUT }, .unit = "type" },
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{ "start_frame", "Number of the first frame to which to apply the effect.",
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OFFSET(start_frame), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, FLAGS },
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{ "s", "Number of the first frame to which to apply the effect.",
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OFFSET(start_frame), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, FLAGS },
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{ "nb_frames", "Number of frames to which the effect should be applied.",
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OFFSET(nb_frames), AV_OPT_TYPE_INT, { .i64 = 25 }, 0, INT_MAX, FLAGS },
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{ "n", "Number of frames to which the effect should be applied.",
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OFFSET(nb_frames), AV_OPT_TYPE_INT, { .i64 = 25 }, 0, INT_MAX, FLAGS },
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{ "alpha", "fade alpha if it is available on the input", OFFSET(alpha), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, 1, FLAGS },
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{ "start_time", "Number of seconds of the beginning of the effect.",
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OFFSET(start_time), AV_OPT_TYPE_DURATION, {.i64 = 0. }, 0, INT32_MAX, FLAGS },
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{ "st", "Number of seconds of the beginning of the effect.",
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OFFSET(start_time), AV_OPT_TYPE_DURATION, {.i64 = 0. }, 0, INT32_MAX, FLAGS },
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{ "duration", "Duration of the effect in seconds.",
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OFFSET(duration), AV_OPT_TYPE_DURATION, {.i64 = 0. }, 0, INT32_MAX, FLAGS },
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{ "d", "Duration of the effect in seconds.",
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OFFSET(duration), AV_OPT_TYPE_DURATION, {.i64 = 0. }, 0, INT32_MAX, FLAGS },
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{ NULL },
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};
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AVFILTER_DEFINE_CLASS(fade);
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static const AVFilterPad avfilter_vf_fade_inputs[] = {
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{
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.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 = ff_null_get_video_buffer,
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.filter_frame = filter_frame,
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.needs_writable = 1,
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},
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{ NULL }
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};
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static const AVFilterPad avfilter_vf_fade_outputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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},
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{ NULL }
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};
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AVFilter avfilter_vf_fade = {
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.name = "fade",
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.description = NULL_IF_CONFIG_SMALL("Fade in/out input video."),
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.init = init,
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.priv_size = sizeof(FadeContext),
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.priv_class = &fade_class,
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.query_formats = query_formats,
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.inputs = avfilter_vf_fade_inputs,
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.outputs = avfilter_vf_fade_outputs,
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};
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