/*
* Copyright (c) 2010 Brandon Mintern
* Copyright (c) 2007 Bobby Bingham
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* video fade filter
* based heavily on vf_negate.c by Bobby Bingham
*/
#include "libavutil/avstring.h"
#include "libavutil/common.h"
#include "libavutil/eval.h"
#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
#include "avfilter.h"
#include "drawutils.h"
#include "formats.h"
#include "internal.h"
#include "video.h"
#define R 0
#define G 1
#define B 2
#define A 3
#define Y 0
#define U 1
#define V 2
#define FADE_IN 0
#define FADE_OUT 1
typedef struct {
const AVClass *class;
int type;
int factor, fade_per_frame;
int start_frame, nb_frames;
unsigned int frame_index;
int hsub, vsub, bpp;
unsigned int black_level, black_level_scaled;
uint8_t is_packed_rgb;
uint8_t rgba_map[4];
int alpha;
uint64_t start_time, duration;
enum {VF_FADE_WAITING=0, VF_FADE_FADING, VF_FADE_DONE} fade_state;
} FadeContext;
static av_cold int init(AVFilterContext *ctx)
{
FadeContext *s = ctx->priv;
s->fade_per_frame = (1 << 16) / s->nb_frames;
s->fade_state = VF_FADE_WAITING;
if (s->duration != 0) {
// If duration (seconds) is non-zero, assume that we are not fading based on frames
s->nb_frames = 0; // Mostly to clean up logging
}
// Choose what to log. If both time-based and frame-based options, both lines will be in the log
if (s->start_frame || s->nb_frames) {
av_log(ctx, AV_LOG_VERBOSE,
"type:%s start_frame:%d nb_frames:%d alpha:%d\n",
s->type == FADE_IN ? "in" : "out", s->start_frame,
s->nb_frames,s->alpha);
}
if (s->start_time || s->duration) {
av_log(ctx, AV_LOG_VERBOSE,
"type:%s start_time:%f duration:%f alpha:%d\n",
s->type == FADE_IN ? "in" : "out", (s->start_time / (double)AV_TIME_BASE),
(s->duration / (double)AV_TIME_BASE),s->alpha);
}
return 0;
}
static int query_formats(AVFilterContext *ctx)
{
static const enum AVPixelFormat pix_fmts[] = {
AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV420P,
AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV410P,
AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ420P,
AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUVJ440P,
AV_PIX_FMT_YUVA420P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA444P,
AV_PIX_FMT_RGB24, AV_PIX_FMT_BGR24,
AV_PIX_FMT_ARGB, AV_PIX_FMT_ABGR,
AV_PIX_FMT_RGBA, AV_PIX_FMT_BGRA,
AV_PIX_FMT_NONE
};
ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
return 0;
}
const static enum AVPixelFormat studio_level_pix_fmts[] = {
AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV420P,
AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV410P,
AV_PIX_FMT_YUV440P,
AV_PIX_FMT_NONE
};
static int config_props(AVFilterLink *inlink)
{
FadeContext *s = inlink->dst->priv;
const AVPixFmtDescriptor *pixdesc = av_pix_fmt_desc_get(inlink->format);
s->hsub = pixdesc->log2_chroma_w;
s->vsub = pixdesc->log2_chroma_h;
s->bpp = av_get_bits_per_pixel(pixdesc) >> 3;
s->alpha &= !!(pixdesc->flags & AV_PIX_FMT_FLAG_ALPHA);
s->is_packed_rgb = ff_fill_rgba_map(s->rgba_map, inlink->format) >= 0;
/* use CCIR601/709 black level for studio-level pixel non-alpha components */
s->black_level =
ff_fmt_is_in(inlink->format, studio_level_pix_fmts) && !s->alpha ? 16 : 0;
/* 32768 = 1 << 15, it is an integer representation
* of 0.5 and is for rounding. */
s->black_level_scaled = (s->black_level << 16) + 32768;
return 0;
}
static int filter_slice_luma(AVFilterContext *ctx, void *arg, int jobnr,
int nb_jobs)
{
FadeContext *s = ctx->priv;
AVFrame *frame = arg;
int slice_start = (frame->height * jobnr ) / nb_jobs;
int slice_end = (frame->height * (jobnr+1)) / nb_jobs;
int i, j;
for (i = slice_start; i < slice_end; i++) {
uint8_t *p = frame->data[0] + i * frame->linesize[0];
for (j = 0; j < frame->width * s->bpp; j++) {
/* s->factor is using 16 lower-order bits for decimal
* places. 32768 = 1 << 15, it is an integer representation
* of 0.5 and is for rounding. */
*p = ((*p - s->black_level) * s->factor + s->black_level_scaled) >> 16;
p++;
}
}
return 0;
}
static int filter_slice_chroma(AVFilterContext *ctx, void *arg, int jobnr,
int nb_jobs)
{
FadeContext *s = ctx->priv;
AVFrame *frame = arg;
int i, j, plane;
const int width = FF_CEIL_RSHIFT(frame->width, s->hsub);
const int height= FF_CEIL_RSHIFT(frame->height, s->vsub);
int slice_start = (height * jobnr ) / nb_jobs;
int slice_end = (height * (jobnr+1)) / nb_jobs;
for (plane = 1; plane < 3; plane++) {
for (i = slice_start; i < slice_end; i++) {
uint8_t *p = frame->data[plane] + i * frame->linesize[plane];
for (j = 0; j < width; j++) {
/* 8421367 = ((128 << 1) + 1) << 15. It is an integer
* representation of 128.5. The .5 is for rounding
* purposes. */
*p = ((*p - 128) * s->factor + 8421367) >> 16;
p++;
}
}
}
return 0;
}
static int filter_slice_alpha(AVFilterContext *ctx, void *arg, int jobnr,
int nb_jobs)
{
FadeContext *s = ctx->priv;
AVFrame *frame = arg;
int plane = s->is_packed_rgb ? 0 : A;
int slice_start = (frame->height * jobnr ) / nb_jobs;
int slice_end = (frame->height * (jobnr+1)) / nb_jobs;
int i, j;
for (i = slice_start; i < slice_end; i++) {
uint8_t *p = frame->data[plane] + i * frame->linesize[plane] + s->is_packed_rgb*s->rgba_map[A];
int step = s->is_packed_rgb ? 4 : 1;
for (j = 0; j < frame->width; j++) {
/* s->factor is using 16 lower-order bits for decimal
* places. 32768 = 1 << 15, it is an integer representation
* of 0.5 and is for rounding. */
*p = ((*p - s->black_level) * s->factor + s->black_level_scaled) >> 16;
p += step;
}
}
return 0;
}
static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
{
AVFilterContext *ctx = inlink->dst;
FadeContext *s = ctx->priv;
double frame_timestamp = frame->pts == AV_NOPTS_VALUE ? -1 : frame->pts * av_q2d(inlink->time_base);
// Calculate Fade assuming this is a Fade In
if (s->fade_state == VF_FADE_WAITING) {
s->factor=0;
if ((frame_timestamp >= (s->start_time/(double)AV_TIME_BASE))
&& (s->frame_index >= s->start_frame)) {
// Time to start fading
s->fade_state = VF_FADE_FADING;
// Save start time in case we are starting based on frames and fading based on time
if ((s->start_time == 0) && (s->start_frame != 0)) {
s->start_time = frame_timestamp*(double)AV_TIME_BASE;
}
// Save start frame in case we are starting based on time and fading based on frames
if ((s->start_time != 0) && (s->start_frame == 0)) {
s->start_frame = s->frame_index;
}
}
}
if (s->fade_state == VF_FADE_FADING) {
if (s->duration == 0) {
// Fading based on frame count
s->factor = (s->frame_index - s->start_frame) * s->fade_per_frame;
if (s->frame_index > (s->start_frame + s->nb_frames)) {
s->fade_state = VF_FADE_DONE;
}
} else {
// Fading based on duration
s->factor = (frame_timestamp - (s->start_time/(double)AV_TIME_BASE))
* (float) UINT16_MAX / (s->duration/(double)AV_TIME_BASE);
if (frame_timestamp > ((s->start_time/(double)AV_TIME_BASE)
+ (s->duration/(double)AV_TIME_BASE))) {
s->fade_state = VF_FADE_DONE;
}
}
}
if (s->fade_state == VF_FADE_DONE) {
s->factor=UINT16_MAX;
}
s->factor = av_clip_uint16(s->factor);
// Invert fade_factor if Fading Out
if (s->type == 1) {
s->factor=UINT16_MAX-s->factor;
}
if (s->factor < UINT16_MAX) {
if (s->alpha) {
ctx->internal->execute(ctx, filter_slice_alpha, frame, NULL,
FFMIN(frame->height, ctx->graph->nb_threads));
} else {
/* luma or rgb plane */
ctx->internal->execute(ctx, filter_slice_luma, frame, NULL,
FFMIN(frame->height, ctx->graph->nb_threads));
if (frame->data[1] && frame->data[2]) {
/* chroma planes */
ctx->internal->execute(ctx, filter_slice_chroma, frame, NULL,
FFMIN(frame->height, ctx->graph->nb_threads));
}
}
}
s->frame_index++;
return ff_filter_frame(inlink->dst->outputs[0], frame);
}
#define OFFSET(x) offsetof(FadeContext, x)
#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
static const AVOption fade_options[] = {
{ "type", "'in' or 'out' for fade-in/fade-out", OFFSET(type), AV_OPT_TYPE_INT, { .i64 = FADE_IN }, FADE_IN, FADE_OUT, FLAGS, "type" },
{ "t", "'in' or 'out' for fade-in/fade-out", OFFSET(type), AV_OPT_TYPE_INT, { .i64 = FADE_IN }, FADE_IN, FADE_OUT, FLAGS, "type" },
{ "in", "fade-in", 0, AV_OPT_TYPE_CONST, { .i64 = FADE_IN }, .unit = "type" },
{ "out", "fade-out", 0, AV_OPT_TYPE_CONST, { .i64 = FADE_OUT }, .unit = "type" },
{ "start_frame", "Number of the first frame to which to apply the effect.",
OFFSET(start_frame), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, FLAGS },
{ "s", "Number of the first frame to which to apply the effect.",
OFFSET(start_frame), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, FLAGS },
{ "nb_frames", "Number of frames to which the effect should be applied.",
OFFSET(nb_frames), AV_OPT_TYPE_INT, { .i64 = 25 }, 0, INT_MAX, FLAGS },
{ "n", "Number of frames to which the effect should be applied.",
OFFSET(nb_frames), AV_OPT_TYPE_INT, { .i64 = 25 }, 0, INT_MAX, FLAGS },
{ "alpha", "fade alpha if it is available on the input", OFFSET(alpha), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, 1, FLAGS },
{ "start_time", "Number of seconds of the beginning of the effect.",
OFFSET(start_time), AV_OPT_TYPE_DURATION, {.i64 = 0. }, 0, INT32_MAX, FLAGS },
{ "st", "Number of seconds of the beginning of the effect.",
OFFSET(start_time), AV_OPT_TYPE_DURATION, {.i64 = 0. }, 0, INT32_MAX, FLAGS },
{ "duration", "Duration of the effect in seconds.",
OFFSET(duration), AV_OPT_TYPE_DURATION, {.i64 = 0. }, 0, INT32_MAX, FLAGS },
{ "d", "Duration of the effect in seconds.",
OFFSET(duration), AV_OPT_TYPE_DURATION, {.i64 = 0. }, 0, INT32_MAX, FLAGS },
{ NULL }
};
AVFILTER_DEFINE_CLASS(fade);
static const AVFilterPad avfilter_vf_fade_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_props,
.filter_frame = filter_frame,
.needs_writable = 1,
},
{ NULL }
};
static const AVFilterPad avfilter_vf_fade_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
},
{ NULL }
};
AVFilter avfilter_vf_fade = {
.name = "fade",
.description = NULL_IF_CONFIG_SMALL("Fade in/out input video."),
.init = init,
.priv_size = sizeof(FadeContext),
.priv_class = &fade_class,
.query_formats = query_formats,
.inputs = avfilter_vf_fade_inputs,
.outputs = avfilter_vf_fade_outputs,
.flags = AVFILTER_FLAG_SLICE_THREADS,
};