2012-03-02 17:51:26 +03:00
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/*
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* Copyright (c) 2012 Stefano Sabatini
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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 black detector, loosely based on blackframe with extended
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* syntax and features
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*/
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#include <float.h>
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#include "libavutil/opt.h"
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#include "libavutil/timestamp.h"
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#include "avfilter.h"
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#include "internal.h"
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typedef struct {
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const AVClass *class;
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double black_min_duration_time; ///< minimum duration of detected black, in seconds
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int64_t black_min_duration; ///< minimum duration of detected black, expressed in timebase units
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int64_t black_start; ///< pts start time of the first black picture
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int64_t black_end; ///< pts end time of the last black picture
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int black_started;
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double picture_black_ratio_th;
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double pixel_black_th;
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unsigned int pixel_black_th_i;
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unsigned int frame_count; ///< frame number
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unsigned int nb_black_pixels; ///< number of black pixels counted so far
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} BlackDetectContext;
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#define OFFSET(x) offsetof(BlackDetectContext, x)
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static const AVOption blackdetect_options[] = {
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{ "d", "set minimum detected black duration in seconds", OFFSET(black_min_duration_time), AV_OPT_TYPE_DOUBLE, {.dbl=2}, 0, DBL_MAX},
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{ "black_min_duration", "set minimum detected black duration in seconds", OFFSET(black_min_duration_time), AV_OPT_TYPE_DOUBLE, {.dbl=2}, 0, DBL_MAX},
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{ "picture_black_ratio_th", "set the picture black ratio threshold", OFFSET(picture_black_ratio_th), AV_OPT_TYPE_DOUBLE, {.dbl=.98}, 0, 1},
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{ "pic_th", "set the picture black ratio threshold", OFFSET(picture_black_ratio_th), AV_OPT_TYPE_DOUBLE, {.dbl=.98}, 0, 1},
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{ "pixel_black_th", "set the pixel black threshold", OFFSET(pixel_black_th), AV_OPT_TYPE_DOUBLE, {.dbl=.10}, 0, 1},
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{ "pix_th", "set the pixel black threshold", OFFSET(pixel_black_th), AV_OPT_TYPE_DOUBLE, {.dbl=.10}, 0, 1},
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{ NULL },
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};
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static const char *blackdetect_get_name(void *ctx)
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{
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return "blackdetect";
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}
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static const AVClass blackdetect_class = {
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.class_name = "BlackDetectContext",
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.item_name = blackdetect_get_name,
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.option = blackdetect_options,
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};
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#define YUVJ_FORMATS \
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PIX_FMT_YUVJ420P, PIX_FMT_YUVJ422P, PIX_FMT_YUVJ444P, PIX_FMT_YUVJ440P
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static enum PixelFormat yuvj_formats[] = {
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YUVJ_FORMATS, PIX_FMT_NONE
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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_YUV410P, PIX_FMT_YUV420P, PIX_FMT_GRAY8, PIX_FMT_NV12,
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PIX_FMT_NV21, PIX_FMT_YUV444P, PIX_FMT_YUV422P, PIX_FMT_YUV411P,
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YUVJ_FORMATS,
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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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static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
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{
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int ret;
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BlackDetectContext *blackdetect = ctx->priv;
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blackdetect->class = &blackdetect_class;
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av_opt_set_defaults(blackdetect);
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if ((ret = av_set_options_string(blackdetect, args, "=", ":")) < 0) {
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av_log(ctx, AV_LOG_ERROR, "Error parsing options string: '%s'\n", args);
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return ret;
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}
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return 0;
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}
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static int config_input(AVFilterLink *inlink)
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{
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AVFilterContext *ctx = inlink->dst;
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BlackDetectContext *blackdetect = ctx->priv;
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blackdetect->black_min_duration =
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blackdetect->black_min_duration_time / av_q2d(inlink->time_base);
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blackdetect->pixel_black_th_i = ff_fmt_is_in(inlink->format, yuvj_formats) ?
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// luminance_minimum_value + pixel_black_th * luminance_range_size
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blackdetect->pixel_black_th * 255 :
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16 + blackdetect->pixel_black_th * (235 - 16);
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av_log(blackdetect, AV_LOG_INFO,
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"black_min_duration:%s pixel_black_th:%f pixel_black_th_i:%d picture_black_ratio_th:%f\n",
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av_ts2timestr(blackdetect->black_min_duration, &inlink->time_base),
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blackdetect->pixel_black_th, blackdetect->pixel_black_th_i,
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blackdetect->picture_black_ratio_th);
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return 0;
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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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AVFilterContext *ctx = inlink->dst;
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BlackDetectContext *blackdetect = ctx->priv;
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AVFilterBufferRef *picref = inlink->cur_buf;
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int x, i;
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const uint8_t *p = picref->data[0] + y * picref->linesize[0];
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for (i = 0; i < h; i++) {
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for (x = 0; x < inlink->w; x++)
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blackdetect->nb_black_pixels += p[x] <= blackdetect->pixel_black_th_i;
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p += picref->linesize[0];
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}
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avfilter_draw_slice(ctx->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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AVFilterContext *ctx = inlink->dst;
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BlackDetectContext *blackdetect = ctx->priv;
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AVFilterBufferRef *picref = inlink->cur_buf;
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double picture_black_ratio = 0;
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picture_black_ratio = (double)blackdetect->nb_black_pixels / (inlink->w * inlink->h);
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av_log(ctx, AV_LOG_DEBUG,
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"frame:%u picture_black_ratio:%f pos:%"PRId64" pts:%s t:%s type:%c\n",
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blackdetect->frame_count, picture_black_ratio,
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picref->pos, av_ts2str(picref->pts),
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av_ts2timestr(blackdetect->black_start, &inlink->time_base),
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av_get_picture_type_char(picref->video->pict_type));
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if (picture_black_ratio >= blackdetect->picture_black_ratio_th) {
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if (!blackdetect->black_started) {
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/* black starts here */
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blackdetect->black_started = 1;
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blackdetect->black_start = picref->pts;
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}
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} else if (blackdetect->black_started) {
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/* black ends here */
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blackdetect->black_started = 0;
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blackdetect->black_end = picref->pts;
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if ((blackdetect->black_end - blackdetect->black_start) >= blackdetect->black_min_duration) {
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av_log(blackdetect, AV_LOG_INFO,
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"black_start:%s black_end:%s black_duration:%s\n",
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av_ts2timestr(blackdetect->black_start, &inlink->time_base),
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av_ts2timestr(blackdetect->black_end, &inlink->time_base),
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av_ts2timestr(blackdetect->black_end - blackdetect->black_start, &inlink->time_base));
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}
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}
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blackdetect->frame_count++;
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blackdetect->nb_black_pixels = 0;
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2012-04-25 01:25:18 +03:00
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avfilter_unref_buffer(picref);
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2012-03-02 17:51:26 +03:00
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avfilter_end_frame(inlink->dst->outputs[0]);
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}
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AVFilter avfilter_vf_blackdetect = {
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.name = "blackdetect",
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.description = NULL_IF_CONFIG_SMALL("Detect video intervals that are (almost) black."),
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.priv_size = sizeof(BlackDetectContext),
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.init = init,
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.query_formats = query_formats,
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.inputs = (const AVFilterPad[]) {
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{ .name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.config_props = config_input,
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.draw_slice = draw_slice,
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.get_video_buffer = avfilter_null_get_video_buffer,
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2012-04-25 01:25:18 +03:00
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.start_frame = ff_null_start_frame_keep_ref,
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2012-03-02 17:51:26 +03:00
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.end_frame = end_frame, },
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{ .name = NULL }
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},
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.outputs = (const AVFilterPad[]) {
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{ .name = "default",
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.type = AVMEDIA_TYPE_VIDEO },
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{ .name = NULL }
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},
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};
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