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