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#include "libavutil/common.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 "formats.h"
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#include "internal.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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int start_frame, nb_frames;
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unsigned int frame_index, stop_frame;
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int hsub, vsub, bpp;
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static av_cold int init(AVFilterContext *ctx, const char *args)
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static av_cold int init(AVFilterContext *ctx)
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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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FadeContext *s = ctx->priv;
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s->fade_per_frame = (1 << 16) / s->nb_frames;
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if (s->type == FADE_IN) {
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} else if (s->type == FADE_OUT) {
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s->fade_per_frame = -s->fade_per_frame;
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s->factor = (1 << 16);
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s->stop_frame = s->start_frame + s->nb_frames;
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av_log(ctx, AV_LOG_VERBOSE,
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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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s->type == FADE_IN ? "in" : "out", s->start_frame,
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static int config_props(AVFilterLink *inlink)
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FadeContext *fade = inlink->dst->priv;
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FadeContext *s = 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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static int filter_frame(AVFilterLink *inlink, AVFilterBufferRef *frame)
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FadeContext *fade = inlink->dst->priv;
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s->hsub = pixdesc->log2_chroma_w;
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s->vsub = pixdesc->log2_chroma_h;
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s->bpp = av_get_bits_per_pixel(pixdesc) >> 3;
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static int filter_slice_luma(AVFilterContext *ctx, void *arg, int jobnr,
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FadeContext *s = ctx->priv;
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int slice_h = frame->height / nb_jobs;
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int slice_start = jobnr * slice_h;
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int slice_end = (jobnr == nb_jobs - 1) ? frame->height : (jobnr + 1) * slice_h;
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for (i = slice_start; i < slice_end; i++) {
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uint8_t *p = frame->data[0] + i * frame->linesize[0];
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for (j = 0; j < frame->width * s->bpp; j++) {
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/* s->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 * s->factor + 32768) >> 16;
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static int filter_slice_chroma(AVFilterContext *ctx, void *arg, int jobnr,
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FadeContext *s = ctx->priv;
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AVFrame *frame = arg;
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int slice_h = FFALIGN(frame->height / nb_jobs, 1 << s->vsub);
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int slice_start = jobnr * slice_h;
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int slice_end = (jobnr == nb_jobs - 1) ? frame->height : (jobnr + 1) * slice_h;
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if (fade->factor < UINT16_MAX) {
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for (plane = 1; plane < 3; plane++) {
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for (i = slice_start; i < slice_end; i++) {
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uint8_t *p = frame->data[plane] + (i >> s->vsub) * frame->linesize[plane];
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for (j = 0; j < frame->width >> s->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) * s->factor + 8421367) >> 16;
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static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
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AVFilterContext *ctx = inlink->dst;
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FadeContext *s = ctx->priv;
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if (s->factor < UINT16_MAX) {
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/* luma or rgb plane */
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for (i = 0; i < frame->video->h; i++) {
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p = frame->data[0] + i * frame->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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ctx->internal->execute(ctx, filter_slice_luma, frame, NULL,
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FFMIN(frame->height, ctx->graph->nb_threads));
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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->video->h; 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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*p = ((*p - 128) * fade->factor + 8421367) >> 16;
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ctx->internal->execute(ctx, filter_slice_chroma, frame, NULL,
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FFMIN(frame->height, ctx->graph->nb_threads));
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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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if (s->frame_index >= s->start_frame &&
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s->frame_index <= s->stop_frame)
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s->factor += s->fade_per_frame;
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s->factor = av_clip_uint16(s->factor);
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return ff_filter_frame(inlink->dst->outputs[0], frame);
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#define OFFSET(x) offsetof(FadeContext, x)
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#define FLAGS AV_OPT_FLAG_VIDEO_PARAM
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static const AVOption 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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{ "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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{ "nb_frames", "Number of frames to which the effect should be applied.",
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OFFSET(nb_frames), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, INT_MAX, FLAGS },
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static const AVClass fade_class = {
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.class_name = "fade",
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.item_name = av_default_item_name,
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.version = LIBAVUTIL_VERSION_INT,
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static const AVFilterPad avfilter_vf_fade_inputs[] = {
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.name = "default",