| /* |
| * 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/pixdesc.h" |
| #include "avfilter.h" |
| |
| typedef struct { |
| int factor, fade_per_frame; |
| unsigned int frame_index, start_frame, stop_frame; |
| int hsub, vsub, bpp; |
| } FadeContext; |
| |
| static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque) |
| { |
| FadeContext *fade = ctx->priv; |
| unsigned int nb_frames; |
| char in_out[4]; |
| |
| if (!args || |
| sscanf(args, " %3[^:]:%u:%u", in_out, &fade->start_frame, &nb_frames) != 3) { |
| av_log(ctx, AV_LOG_ERROR, |
| "Expected 3 arguments '(in|out):#:#':'%s'\n", args); |
| return AVERROR(EINVAL); |
| } |
| |
| nb_frames = nb_frames ? nb_frames : 1; |
| fade->fade_per_frame = (1 << 16) / nb_frames; |
| if (!strcmp(in_out, "in")) |
| fade->factor = 0; |
| else if (!strcmp(in_out, "out")) { |
| fade->fade_per_frame = -fade->fade_per_frame; |
| fade->factor = (1 << 16); |
| } else { |
| av_log(ctx, AV_LOG_ERROR, |
| "first argument must be 'in' or 'out':'%s'\n", in_out); |
| return AVERROR(EINVAL); |
| } |
| fade->stop_frame = fade->start_frame + nb_frames; |
| |
| av_log(ctx, AV_LOG_INFO, |
| "type:%s start_frame:%d nb_frames:%d\n", |
| in_out, fade->start_frame, nb_frames); |
| return 0; |
| } |
| |
| static int query_formats(AVFilterContext *ctx) |
| { |
| const static enum PixelFormat pix_fmts[] = { |
| PIX_FMT_YUV444P, PIX_FMT_YUV422P, PIX_FMT_YUV420P, |
| PIX_FMT_YUV411P, PIX_FMT_YUV410P, |
| PIX_FMT_YUVJ444P, PIX_FMT_YUVJ422P, PIX_FMT_YUVJ420P, |
| PIX_FMT_YUV440P, PIX_FMT_YUVJ440P, |
| PIX_FMT_RGB24, PIX_FMT_BGR24, |
| PIX_FMT_NONE |
| }; |
| |
| avfilter_set_common_pixel_formats(ctx, avfilter_make_format_list(pix_fmts)); |
| return 0; |
| } |
| |
| static int config_props(AVFilterLink *inlink) |
| { |
| FadeContext *fade = inlink->dst->priv; |
| const AVPixFmtDescriptor *pixdesc = &av_pix_fmt_descriptors[inlink->format]; |
| |
| fade->hsub = pixdesc->log2_chroma_w; |
| fade->vsub = pixdesc->log2_chroma_h; |
| |
| fade->bpp = av_get_bits_per_pixel(pixdesc) >> 3; |
| return 0; |
| } |
| |
| static void draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir) |
| { |
| FadeContext *fade = inlink->dst->priv; |
| AVFilterBufferRef *outpic = inlink->cur_buf; |
| uint8_t *p; |
| int i, j, plane; |
| |
| if (fade->factor < UINT16_MAX) { |
| /* luma or rgb plane */ |
| for (i = 0; i < h; i++) { |
| p = outpic->data[0] + (y+i) * outpic->linesize[0]; |
| for (j = 0; j < inlink->w * fade->bpp; j++) { |
| /* fade->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 * fade->factor + 32768) >> 16; |
| p++; |
| } |
| } |
| |
| if (outpic->data[1] && outpic->data[2]) { |
| /* chroma planes */ |
| for (plane = 1; plane < 3; plane++) { |
| for (i = 0; i < h; i++) { |
| p = outpic->data[plane] + ((y+i) >> fade->vsub) * outpic->linesize[plane]; |
| for (j = 0; j < inlink->w >> fade->hsub; j++) { |
| /* 8421367 = ((128 << 1) + 1) << 15. It is an integer |
| * representation of 128.5. The .5 is for rounding |
| * purposes. */ |
| *p = ((*p - 128) * fade->factor + 8421367) >> 16; |
| p++; |
| } |
| } |
| } |
| } |
| } |
| |
| avfilter_draw_slice(inlink->dst->outputs[0], y, h, slice_dir); |
| } |
| |
| static void end_frame(AVFilterLink *inlink) |
| { |
| FadeContext *fade = inlink->dst->priv; |
| |
| avfilter_end_frame(inlink->dst->outputs[0]); |
| |
| if (fade->frame_index >= fade->start_frame && |
| fade->frame_index <= fade->stop_frame) |
| fade->factor += fade->fade_per_frame; |
| fade->factor = av_clip_uint16(fade->factor); |
| fade->frame_index++; |
| } |
| |
| AVFilter avfilter_vf_fade = { |
| .name = "fade", |
| .description = NULL_IF_CONFIG_SMALL("Fade in/out input video"), |
| .init = init, |
| .priv_size = sizeof(FadeContext), |
| .query_formats = query_formats, |
| |
| .inputs = (AVFilterPad[]) {{ .name = "default", |
| .type = AVMEDIA_TYPE_VIDEO, |
| .config_props = config_props, |
| .get_video_buffer = avfilter_null_get_video_buffer, |
| .start_frame = avfilter_null_start_frame, |
| .draw_slice = draw_slice, |
| .end_frame = end_frame, |
| .min_perms = AV_PERM_READ | AV_PERM_WRITE, |
| .rej_perms = AV_PERM_PRESERVE, }, |
| { .name = NULL}}, |
| .outputs = (AVFilterPad[]) {{ .name = "default", |
| .type = AVMEDIA_TYPE_VIDEO, }, |
| { .name = NULL}}, |
| }; |