/* * Copyright (c) 2010 Brandon Mintern * Copyright (c) 2007 Bobby Bingham * * This file is part of Libav. * * Libav 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. * * Libav 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 Libav; 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/common.h" #include "libavutil/opt.h" #include "libavutil/pixdesc.h" #include "avfilter.h" #include "formats.h" #include "internal.h" #include "video.h" #define FADE_IN 0 #define FADE_OUT 1 typedef struct FadeContext { const AVClass *class; int type; int factor, fade_per_frame; int start_frame, nb_frames; unsigned int frame_index, stop_frame; int hsub, vsub, bpp; } FadeContext; static av_cold int init(AVFilterContext *ctx) { FadeContext *s = ctx->priv; s->fade_per_frame = (1 << 16) / s->nb_frames; if (s->type == FADE_IN) { s->factor = 0; } else if (s->type == FADE_OUT) { s->fade_per_frame = -s->fade_per_frame; s->factor = (1 << 16); } s->stop_frame = s->start_frame + s->nb_frames; av_log(ctx, AV_LOG_VERBOSE, "type:%s start_frame:%d nb_frames:%d\n", s->type == FADE_IN ? "in" : "out", s->start_frame, s->nb_frames); 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_RGB24, AV_PIX_FMT_BGR24, AV_PIX_FMT_NONE }; ff_set_common_formats(ctx, ff_make_format_list(pix_fmts)); return 0; } 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; 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_h = frame->height / nb_jobs; int slice_start = jobnr * slice_h; int slice_end = (jobnr == nb_jobs - 1) ? frame->height : (jobnr + 1) * slice_h; 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->factor + 32768) >> 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 slice_h = FFALIGN(frame->height / nb_jobs, 1 << s->vsub); int slice_start = jobnr * slice_h; int slice_end = FFMIN((jobnr + 1) * slice_h, frame->height); int i, j, plane; for (plane = 1; plane < 3; plane++) { for (i = slice_start; i < slice_end; i++) { uint8_t *p = frame->data[plane] + (i >> s->vsub) * frame->linesize[plane]; for (j = 0; j < frame->width >> s->hsub; 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_frame(AVFilterLink *inlink, AVFrame *frame) { AVFilterContext *ctx = inlink->dst; FadeContext *s = ctx->priv; if (s->factor < UINT16_MAX) { /* 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)); } } if (s->frame_index >= s->start_frame && s->frame_index <= s->stop_frame) s->factor += s->fade_per_frame; s->factor = av_clip_uint16(s->factor); 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 static const AVOption 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" }, { "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 }, { "nb_frames", "Number of frames to which the effect should be applied.", OFFSET(nb_frames), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, INT_MAX, FLAGS }, { NULL }, }; static const AVClass fade_class = { .class_name = "fade", .item_name = av_default_item_name, .option = options, .version = LIBAVUTIL_VERSION_INT, }; static const AVFilterPad avfilter_vf_fade_inputs[] = { { .name = "default", .type = AVMEDIA_TYPE_VIDEO, .config_props = config_props, .get_video_buffer = ff_null_get_video_buffer, .filter_frame = filter_frame, .needs_writable = 1, }, { NULL } }; static const AVFilterPad avfilter_vf_fade_outputs[] = { { .name = "default", .type = AVMEDIA_TYPE_VIDEO, }, { NULL } }; AVFilter ff_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, };