302 lines
10 KiB
C
302 lines
10 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/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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#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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typedef struct {
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const AVClass *class;
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int factor, fade_per_frame;
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unsigned int frame_index, start_frame, stop_frame, nb_frames;
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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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char *type;
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} FadeContext;
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#define OFFSET(x) offsetof(FadeContext, x)
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static const AVOption fade_options[] = {
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{ "type", "set the fade direction", OFFSET(type), AV_OPT_TYPE_STRING, {.str = "in" }, CHAR_MIN, CHAR_MAX },
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{ "t", "set the fade direction", OFFSET(type), AV_OPT_TYPE_STRING, {.str = "in" }, CHAR_MIN, CHAR_MAX },
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{ "start_frame", "set expression of frame to start fading", OFFSET(start_frame), AV_OPT_TYPE_INT, {.dbl = 0 }, 0, INT_MAX },
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{ "s", "set expression of frame to start fading", OFFSET(start_frame), AV_OPT_TYPE_INT, {.dbl = 0 }, 0, INT_MAX },
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{ "nb_frames", "set expression for fade duration in frames", OFFSET(nb_frames), AV_OPT_TYPE_INT, {.dbl = 25 }, 0, INT_MAX },
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{ "n", "set expression for fade duration in frames", OFFSET(nb_frames), AV_OPT_TYPE_INT, {.dbl = 25 }, 0, INT_MAX },
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{ "alpha", "fade alpha if it is available on the input", OFFSET(alpha), AV_OPT_TYPE_INT, {.dbl = 0 }, 0, 1 },
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{NULL},
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};
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static const char *fade_get_name(void *ctx)
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{
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return "fade";
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}
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static const AVClass fade_class = {
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"FadeContext",
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fade_get_name,
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fade_options
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};
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static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
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{
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FadeContext *fade = ctx->priv;
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int ret = 0;
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char *args1, *expr, *bufptr = NULL;
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fade->class = &fade_class;
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av_opt_set_defaults(fade);
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if (!(args1 = av_strdup(args))) {
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ret = AVERROR(ENOMEM);
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goto end;
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}
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if (expr = av_strtok(args1, ":", &bufptr)) {
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av_free(fade->type);
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if (!(fade->type = av_strdup(expr))) {
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ret = AVERROR(ENOMEM);
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goto end;
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}
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}
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if (expr = av_strtok(NULL, ":", &bufptr)) {
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if ((ret = av_opt_set(fade, "start_frame", expr, 0)) < 0) {
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av_log(ctx, AV_LOG_ERROR,
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"Invalid value '%s' for start_frame option\n", expr);
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return ret;
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}
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}
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if (expr = av_strtok(NULL, ":", &bufptr)) {
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if ((ret = av_opt_set(fade, "nb_frames", expr, 0)) < 0) {
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av_log(ctx, AV_LOG_ERROR,
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"Invalid value '%s' for nb_frames option\n", expr);
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return ret;
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}
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}
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if (bufptr && (ret = av_set_options_string(fade, bufptr, "=", ":")) < 0)
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goto end;
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fade->fade_per_frame = (1 << 16) / fade->nb_frames;
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if (!strcmp(fade->type, "in"))
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fade->factor = 0;
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else if (!strcmp(fade->type, "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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} else {
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av_log(ctx, AV_LOG_ERROR,
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"Type argument must be 'in' or 'out' but '%s' was specified\n", fade->type);
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ret = AVERROR(EINVAL);
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goto end;
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}
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fade->stop_frame = fade->start_frame + fade->nb_frames;
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av_log(ctx, AV_LOG_INFO,
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"type:%s start_frame:%d nb_frames:%d alpha:%d\n",
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fade->type, fade->start_frame, fade->nb_frames, fade->alpha);
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end:
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av_free(args1);
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return ret;
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}
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static av_cold void uninit(AVFilterContext *ctx)
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{
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FadeContext *fade = ctx->priv;
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av_freep(&fade->type);
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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 PixelFormat pix_fmts[] = {
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PIX_FMT_YUV444P, PIX_FMT_YUV422P, PIX_FMT_YUV420P,
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PIX_FMT_YUV411P, PIX_FMT_YUV410P,
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PIX_FMT_YUVJ444P, PIX_FMT_YUVJ422P, PIX_FMT_YUVJ420P,
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PIX_FMT_YUV440P, PIX_FMT_YUVJ440P,
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PIX_FMT_YUVA420P,
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PIX_FMT_RGB24, PIX_FMT_BGR24,
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PIX_FMT_ARGB, PIX_FMT_ABGR,
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PIX_FMT_RGBA, PIX_FMT_BGRA,
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PIX_FMT_NONE
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};
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avfilter_set_common_pixel_formats(ctx, avfilter_make_format_list(pix_fmts));
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return 0;
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}
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const static enum PixelFormat studio_level_pix_fmts[] = {
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PIX_FMT_YUV444P, PIX_FMT_YUV422P, PIX_FMT_YUV420P,
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PIX_FMT_YUV411P, PIX_FMT_YUV410P,
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PIX_FMT_YUV440P,
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PIX_FMT_NONE
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};
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static enum PixelFormat alpha_pix_fmts[] = {
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PIX_FMT_YUVA420P,
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PIX_FMT_ARGB, PIX_FMT_ABGR,
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PIX_FMT_RGBA, PIX_FMT_BGRA,
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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_descriptors[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 = fade->alpha ? ff_fmt_is_in(inlink->format, alpha_pix_fmts) : 0;
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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 void draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
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{
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FadeContext *fade = inlink->dst->priv;
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AVFilterBufferRef *outpic = inlink->cur_buf;
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uint8_t *p;
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int i, j, plane;
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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(y, h, 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, outpic->data[plane], outpic->linesize[plane]);
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} else {
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/* luma or rgb plane */
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fade_plane(y, h, 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, outpic->data[0], outpic->linesize[0]);
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if (outpic->data[1] && outpic->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 < h; i++) {
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p = outpic->data[plane] + ((y+i) >> fade->vsub) * outpic->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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avfilter_draw_slice(inlink->dst->outputs[0], y, h, slice_dir);
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}
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static void end_frame(AVFilterLink *inlink)
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{
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FadeContext *fade = inlink->dst->priv;
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avfilter_end_frame(inlink->dst->outputs[0]);
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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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fade->frame_index++;
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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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.uninit = uninit,
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.priv_size = sizeof(FadeContext),
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.query_formats = query_formats,
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.inputs = (const AVFilterPad[]) {{ .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 = avfilter_null_get_video_buffer,
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.start_frame = avfilter_null_start_frame,
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.draw_slice = draw_slice,
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.end_frame = end_frame,
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.min_perms = AV_PERM_READ | AV_PERM_WRITE,
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.rej_perms = AV_PERM_PRESERVE, },
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{ .name = NULL}},
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.outputs = (const AVFilterPad[]) {{ .name = "default",
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.type = AVMEDIA_TYPE_VIDEO, },
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{ .name = NULL}},
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};
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