321 lines
11 KiB
C
321 lines
11 KiB
C
/*
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* Copyright (c) 2012-2013 Paul B Mahol
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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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#include "libavutil/avassert.h"
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#include "libavutil/opt.h"
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#include "libavutil/parseutils.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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#include "video.h"
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enum HistogramMode {
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MODE_LEVELS,
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MODE_WAVEFORM,
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MODE_COLOR,
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MODE_COLOR2,
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MODE_NB
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};
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typedef struct HistogramContext {
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const AVClass *class; ///< AVClass context for log and options purpose
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enum HistogramMode mode;
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unsigned histogram[256];
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unsigned max_hval;
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int ncomp;
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const uint8_t *bg_color;
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const uint8_t *fg_color;
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int level_height;
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int scale_height;
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int step;
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int waveform_mode;
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int display_mode;
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} HistogramContext;
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#define OFFSET(x) offsetof(HistogramContext, x)
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#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
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static const AVOption histogram_options[] = {
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{ "mode", "set histogram mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=MODE_LEVELS}, 0, MODE_NB-1, FLAGS, "mode"},
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{ "levels", "standard histogram", 0, AV_OPT_TYPE_CONST, {.i64=MODE_LEVELS}, 0, 0, FLAGS, "mode" },
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{ "waveform", "per row/column luminance graph", 0, AV_OPT_TYPE_CONST, {.i64=MODE_WAVEFORM}, 0, 0, FLAGS, "mode" },
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{ "color", "chroma values in vectorscope", 0, AV_OPT_TYPE_CONST, {.i64=MODE_COLOR}, 0, 0, FLAGS, "mode" },
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{ "color2", "chroma values in vectorscope", 0, AV_OPT_TYPE_CONST, {.i64=MODE_COLOR2}, 0, 0, FLAGS, "mode" },
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{ "level_height", "set level height", OFFSET(level_height), AV_OPT_TYPE_INT, {.i64=200}, 50, 2048, FLAGS},
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{ "scale_height", "set scale height", OFFSET(scale_height), AV_OPT_TYPE_INT, {.i64=12}, 0, 40, FLAGS},
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{ "step", "set waveform step value", OFFSET(step), AV_OPT_TYPE_INT, {.i64=10}, 1, 255, FLAGS},
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{ "waveform_mode", "set waveform mode", OFFSET(waveform_mode), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS, "waveform_mode"},
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{ "row", NULL, 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, FLAGS, "waveform_mode" },
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{ "column", NULL, 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, FLAGS, "waveform_mode" },
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{ "display_mode", "set display mode", OFFSET(display_mode), AV_OPT_TYPE_INT, {.i64=1}, 0, 1, FLAGS, "display_mode"},
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{ "parade", NULL, 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, FLAGS, "display_mode" },
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{ "overlay", NULL, 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, FLAGS, "display_mode" },
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{ NULL },
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};
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AVFILTER_DEFINE_CLASS(histogram);
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static const enum AVPixelFormat color_pix_fmts[] = {
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AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUVJ444P,
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AV_PIX_FMT_NONE
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};
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static const enum AVPixelFormat levels_pix_fmts[] = {
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AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUVJ444P,
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AV_PIX_FMT_GRAY8, AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRAP, AV_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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HistogramContext *h = ctx->priv;
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const enum AVPixelFormat *pix_fmts;
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switch (h->mode) {
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case MODE_WAVEFORM:
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case MODE_LEVELS:
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pix_fmts = levels_pix_fmts;
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break;
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case MODE_COLOR:
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case MODE_COLOR2:
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pix_fmts = color_pix_fmts;
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break;
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default:
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av_assert0(0);
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}
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ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
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return 0;
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}
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static const uint8_t black_yuva_color[4] = { 0, 127, 127, 255 };
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static const uint8_t black_gbrp_color[4] = { 0, 0, 0, 255 };
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static const uint8_t white_yuva_color[4] = { 255, 127, 127, 255 };
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static const uint8_t white_gbrp_color[4] = { 255, 255, 255, 255 };
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static int config_input(AVFilterLink *inlink)
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{
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HistogramContext *h = inlink->dst->priv;
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const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
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h->ncomp = desc->nb_components;
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switch (inlink->format) {
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case AV_PIX_FMT_GBRAP:
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case AV_PIX_FMT_GBRP:
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h->bg_color = black_gbrp_color;
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h->fg_color = white_gbrp_color;
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break;
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default:
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h->bg_color = black_yuva_color;
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h->fg_color = white_yuva_color;
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}
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return 0;
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}
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static int config_output(AVFilterLink *outlink)
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{
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AVFilterContext *ctx = outlink->src;
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HistogramContext *h = ctx->priv;
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switch (h->mode) {
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case MODE_LEVELS:
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outlink->w = 256;
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outlink->h = (h->level_height + h->scale_height) * FFMAX(h->ncomp * h->display_mode, 1);
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break;
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case MODE_WAVEFORM:
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if (h->waveform_mode)
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outlink->h = 256 * FFMAX(h->ncomp * h->display_mode, 1);
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else
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outlink->w = 256 * FFMAX(h->ncomp * h->display_mode, 1);
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break;
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case MODE_COLOR:
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case MODE_COLOR2:
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outlink->h = outlink->w = 256;
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break;
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default:
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av_assert0(0);
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}
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outlink->sample_aspect_ratio = (AVRational){1,1};
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return 0;
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}
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static int filter_frame(AVFilterLink *inlink, AVFrame *in)
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{
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HistogramContext *h = inlink->dst->priv;
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AVFilterContext *ctx = inlink->dst;
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AVFilterLink *outlink = ctx->outputs[0];
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AVFrame *out;
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const uint8_t *src;
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uint8_t *dst;
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int i, j, k, l;
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out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
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if (!out) {
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av_frame_free(&in);
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return AVERROR(ENOMEM);
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}
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out->pts = in->pts;
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for (k = 0; k < h->ncomp; k++)
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for (i = 0; i < outlink->h; i++)
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memset(out->data[k] + i * out->linesize[k], h->bg_color[k], outlink->w);
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switch (h->mode) {
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case MODE_LEVELS:
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for (k = 0; k < h->ncomp; k++) {
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int start = k * (h->level_height + h->scale_height) * h->display_mode;
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for (i = 0; i < in->height; i++) {
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src = in->data[k] + i * in->linesize[k];
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for (j = 0; j < in->width; j++)
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h->histogram[src[j]]++;
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}
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for (i = 0; i < 256; i++)
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h->max_hval = FFMAX(h->max_hval, h->histogram[i]);
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for (i = 0; i < outlink->w; i++) {
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int col_height = h->level_height - (h->histogram[i] * (int64_t)h->level_height + h->max_hval - 1) / h->max_hval;
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for (j = h->level_height - 1; j >= col_height; j--) {
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if (h->display_mode) {
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for (l = 0; l < h->ncomp; l++)
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out->data[l][(j + start) * out->linesize[l] + i] = h->fg_color[l];
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} else {
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out->data[k][(j + start) * out->linesize[k] + i] = 255;
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}
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}
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for (j = h->level_height + h->scale_height - 1; j >= h->level_height; j--)
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out->data[k][(j + start) * out->linesize[k] + i] = i;
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}
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memset(h->histogram, 0, 256 * sizeof(unsigned));
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h->max_hval = 0;
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}
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break;
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case MODE_WAVEFORM:
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if (h->waveform_mode) {
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for (k = 0; k < h->ncomp; k++) {
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int offset = k * 256 * h->display_mode;
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for (i = 0; i < inlink->w; i++) {
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for (j = 0; j < inlink->h; j++) {
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int pos = (offset +
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in->data[k][j * in->linesize[k] + i]) *
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out->linesize[k] + i;
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unsigned value = out->data[k][pos];
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value = FFMIN(value + h->step, 255);
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out->data[k][pos] = value;
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}
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}
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}
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} else {
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for (k = 0; k < h->ncomp; k++) {
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int offset = k * 256 * h->display_mode;
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for (i = 0; i < inlink->h; i++) {
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src = in ->data[k] + i * in ->linesize[k];
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dst = out->data[k] + i * out->linesize[k];
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for (j = 0; j < inlink->w; j++) {
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int pos = src[j] + offset;
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unsigned value = dst[pos];
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value = FFMIN(value + h->step, 255);
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dst[pos] = value;
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}
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}
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}
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}
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break;
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case MODE_COLOR:
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for (i = 0; i < inlink->h; i++) {
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int iw1 = i * in->linesize[1];
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int iw2 = i * in->linesize[2];
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for (j = 0; j < inlink->w; j++) {
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int pos = in->data[1][iw1 + j] * out->linesize[0] + in->data[2][iw2 + j];
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if (out->data[0][pos] < 255)
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out->data[0][pos]++;
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}
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}
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for (i = 0; i < 256; i++) {
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dst = out->data[0] + i * out->linesize[0];
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for (j = 0; j < 256; j++) {
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if (!dst[j]) {
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out->data[1][i * out->linesize[0] + j] = i;
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out->data[2][i * out->linesize[0] + j] = j;
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}
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}
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}
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break;
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case MODE_COLOR2:
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for (i = 0; i < inlink->h; i++) {
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int iw1 = i * in->linesize[1];
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int iw2 = i * in->linesize[2];
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for (j = 0; j < inlink->w; j++) {
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int u = in->data[1][iw1 + j];
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int v = in->data[2][iw2 + j];
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int pos = u * out->linesize[0] + v;
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if (!out->data[0][pos])
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out->data[0][pos] = FFABS(128 - u) + FFABS(128 - v);
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out->data[1][pos] = u;
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out->data[2][pos] = v;
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}
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}
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break;
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default:
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av_assert0(0);
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}
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av_frame_free(&in);
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return ff_filter_frame(outlink, out);
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}
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static const AVFilterPad inputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.filter_frame = filter_frame,
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.config_props = config_input,
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},
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{ NULL }
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};
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static const AVFilterPad outputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.config_props = config_output,
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},
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{ NULL }
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};
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AVFilter avfilter_vf_histogram = {
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.name = "histogram",
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.description = NULL_IF_CONFIG_SMALL("Compute and draw a histogram."),
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.priv_size = sizeof(HistogramContext),
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.query_formats = query_formats,
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.inputs = inputs,
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.outputs = outputs,
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.priv_class = &histogram_class,
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};
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