/*
* Copyright (c) 2017 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/imgutils.h"
#include "libavutil/pixdesc.h"
#include "libavutil/opt.h"
#include "avfilter.h"
#include "formats.h"
#include "internal.h"
#include "video.h"
#include "framesync.h"
typedef struct MidEqualizerContext {
const AVClass *class;
int width[2][4], height[2][4];
int nb_planes;
int planes;
int histogram_size;
float *histogram[2];
unsigned *cchange;
FFFrameSync fs;
void (*midequalizer)(const uint8_t *in0, const uint8_t *in1,
uint8_t *dst,
ptrdiff_t linesize1, ptrdiff_t linesize2,
ptrdiff_t dlinesize,
int w0, int h0,
int w1, int h1,
float *histogram1, float *histogram2,
unsigned *cchange, size_t hsize);
} MidEqualizerContext;
#define OFFSET(x) offsetof(MidEqualizerContext, x)
#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
static const AVOption midequalizer_options[] = {
{ "planes", "set planes", OFFSET(planes), AV_OPT_TYPE_INT, {.i64=0xF}, 0, 0xF, FLAGS },
{ NULL }
};
AVFILTER_DEFINE_CLASS(midequalizer);
static int query_formats(AVFilterContext *ctx)
{
static const enum AVPixelFormat pix_fmts[] = {
AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV440P,
AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P,
AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUVA420P, AV_PIX_FMT_YUV420P,
AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ420P,
AV_PIX_FMT_YUVJ411P, AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV410P,
AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRAP,
AV_PIX_FMT_GRAY8, AV_PIX_FMT_GRAY9, AV_PIX_FMT_GRAY10, AV_PIX_FMT_GRAY12,
AV_PIX_FMT_YUV420P9, AV_PIX_FMT_YUV422P9, AV_PIX_FMT_YUV444P9,
AV_PIX_FMT_YUV420P10, AV_PIX_FMT_YUV422P10, AV_PIX_FMT_YUV444P10,
AV_PIX_FMT_YUV420P12, AV_PIX_FMT_YUV422P12, AV_PIX_FMT_YUV444P12,
AV_PIX_FMT_YUV420P14, AV_PIX_FMT_YUV422P14, AV_PIX_FMT_YUV444P14,
AV_PIX_FMT_GBRP9, AV_PIX_FMT_GBRP10, AV_PIX_FMT_GBRP12, AV_PIX_FMT_GBRP14,
AV_PIX_FMT_YUVA420P9, AV_PIX_FMT_YUVA422P9, AV_PIX_FMT_YUVA444P9,
AV_PIX_FMT_YUVA420P10, AV_PIX_FMT_YUVA422P10, AV_PIX_FMT_YUVA444P10,
AV_PIX_FMT_GBRAP10, AV_PIX_FMT_GBRAP12,
AV_PIX_FMT_NONE
};
return ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
}
static int process_frame(FFFrameSync *fs)
{
AVFilterContext *ctx = fs->parent;
MidEqualizerContext *s = fs->opaque;
AVFilterLink *outlink = ctx->outputs[0];
AVFrame *out, *in0, *in1;
int ret;
if ((ret = ff_framesync_get_frame(&s->fs, 0, &in0, 0)) < 0 ||
(ret = ff_framesync_get_frame(&s->fs, 1, &in1, 0)) < 0)
return ret;
if (ctx->is_disabled) {
out = av_frame_clone(in0);
if (!out)
return AVERROR(ENOMEM);
} else {
int p;
out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
if (!out)
return AVERROR(ENOMEM);
av_frame_copy_props(out, in0);
for (p = 0; p < s->nb_planes; p++) {
if (!((1 << p) & s->planes)) {
av_image_copy_plane(out->data[p], out->linesize[p], in0->data[p], in0->linesize[p],
s->width[0][p] * (1 + (s->histogram_size > 256)), s->height[0][p]);
continue;
}
s->midequalizer(in0->data[p], in1->data[p],
out->data[p],
in0->linesize[p], in1->linesize[p],
out->linesize[p],
s->width[0][p], s->height[0][p],
s->width[1][p], s->height[1][p],
s->histogram[0], s->histogram[1],
s->cchange, s->histogram_size);
}
}
out->pts = av_rescale_q(in0->pts, s->fs.time_base, outlink->time_base);
return ff_filter_frame(outlink, out);
}
static void compute_histogram8(const uint8_t *src, ptrdiff_t linesize,
int w, int h, float *histogram, size_t hsize)
{
int y, x;
memset(histogram, 0, hsize * sizeof(*histogram));
for (y = 0; y < h; y++) {
for (x = 0; x < w; x++) {
histogram[src[x]] += 1;
}
src += linesize;
}
for (x = 0; x < hsize - 1; x++) {
histogram[x + 1] += histogram[x];
histogram[x] /= hsize;
}
histogram[x] /= hsize;
}
static void compute_histogram16(const uint16_t *src, ptrdiff_t linesize,
int w, int h, float *histogram, size_t hsize)
{
int y, x;
memset(histogram, 0, hsize * sizeof(*histogram));
for (y = 0; y < h; y++) {
for (x = 0; x < w; x++) {
histogram[src[x]] += 1;
}
src += linesize;
}
for (x = 0; x < hsize - 1; x++) {
histogram[x + 1] += histogram[x];
histogram[x] /= hsize;
}
histogram[x] /= hsize;
}
static void compute_contrast_change(float *histogram1, float *histogram2,
unsigned *cchange, size_t hsize)
{
int i;
for (i = 0; i < hsize; i++) {
int j;
for (j = 0; j < hsize && histogram2[j] < histogram1[i]; j++);
cchange[i] = (i + j) / 2;
}
}
static void midequalizer8(const uint8_t *in0, const uint8_t *in1,
uint8_t *dst,
ptrdiff_t linesize1, ptrdiff_t linesize2,
ptrdiff_t dlinesize,
int w0, int h0,
int w1, int h1,
float *histogram1, float *histogram2,
unsigned *cchange,
size_t hsize)
{
int x, y;
compute_histogram8(in0, linesize1, w0, h0, histogram1, hsize);
compute_histogram8(in1, linesize2, w1, h1, histogram2, hsize);
compute_contrast_change(histogram1, histogram2, cchange, hsize);
for (y = 0; y < h0; y++) {
for (x = 0; x < w0; x++) {
dst[x] = av_clip_uint8(cchange[in0[x]]);
}
dst += dlinesize;
in0 += linesize1;
}
}
static void midequalizer16(const uint8_t *in0, const uint8_t *in1,
uint8_t *dst,
ptrdiff_t linesize1, ptrdiff_t linesize2,
ptrdiff_t dlinesize,
int w0, int h0,
int w1, int h1,
float *histogram1, float *histogram2,
unsigned *cchange,
size_t hsize)
{
const uint16_t *i = (const uint16_t *)in0;
uint16_t *d = (uint16_t *)dst;
int x, y;
compute_histogram16(i, linesize1 / 2, w0, h0, histogram1, hsize);
compute_histogram16((const uint16_t *)in1, linesize2 / 2, w1, h1, histogram2, hsize);
compute_contrast_change(histogram1, histogram2, cchange, hsize);
for (y = 0; y < h0; y++) {
for (x = 0; x < w0; x++) {
d[x] = cchange[i[x]];
}
d += dlinesize / 2;
i += linesize1 / 2;
}
}
static int config_input0(AVFilterLink *inlink)
{
AVFilterContext *ctx = inlink->dst;
MidEqualizerContext *s = ctx->priv;
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
int vsub, hsub;
s->nb_planes = av_pix_fmt_count_planes(inlink->format);
hsub = desc->log2_chroma_w;
vsub = desc->log2_chroma_h;
s->height[0][0] = s->height[0][3] = inlink->h;
s->width[0][0] = s->width[0][3] = inlink->w;
s->height[0][1] = s->height[0][2] = AV_CEIL_RSHIFT(inlink->h, vsub);
s->width[0][1] = s->width[0][2] = AV_CEIL_RSHIFT(inlink->w, hsub);
s->histogram_size = 1 << desc->comp[0].depth;
s->histogram[0] = av_calloc(s->histogram_size, sizeof(float));
s->histogram[1] = av_calloc(s->histogram_size, sizeof(float));
s->cchange = av_calloc(s->histogram_size, sizeof(unsigned));
if (!s->histogram[0] || !s->histogram[1] || !s->cchange)
return AVERROR(ENOMEM);
if (s->histogram_size == 256) {
s->midequalizer = midequalizer8;
} else {
s->midequalizer = midequalizer16;
}
return 0;
}
static int config_input1(AVFilterLink *inlink)
{
AVFilterContext *ctx = inlink->dst;
MidEqualizerContext *s = ctx->priv;
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
int vsub, hsub;
s->nb_planes = av_pix_fmt_count_planes(inlink->format);
hsub = desc->log2_chroma_w;
vsub = desc->log2_chroma_h;
s->height[1][0] = s->height[1][3] = inlink->h;
s->width[1][0] = s->width[1][3] = inlink->w;
s->height[1][1] = s->height[1][2] = AV_CEIL_RSHIFT(inlink->h, vsub);
s->width[1][1] = s->width[1][2] = AV_CEIL_RSHIFT(inlink->w, hsub);
return 0;
}
static int config_output(AVFilterLink *outlink)
{
AVFilterContext *ctx = outlink->src;
MidEqualizerContext *s = ctx->priv;
AVFilterLink *in0 = ctx->inputs[0];
AVFilterLink *in1 = ctx->inputs[1];
FFFrameSyncIn *in;
int ret;
if (in0->format != in1->format) {
av_log(ctx, AV_LOG_ERROR, "inputs must be of same pixel format\n");
return AVERROR(EINVAL);
}
outlink->w = in0->w;
outlink->h = in0->h;
outlink->time_base = in0->time_base;
outlink->sample_aspect_ratio = in0->sample_aspect_ratio;
outlink->frame_rate = in0->frame_rate;
if ((ret = ff_framesync_init(&s->fs, ctx, 2)) < 0)
return ret;
in = s->fs.in;
in[0].time_base = in0->time_base;
in[1].time_base = in1->time_base;
in[0].sync = 1;
in[0].before = EXT_STOP;
in[0].after = EXT_INFINITY;
in[1].sync = 1;
in[1].before = EXT_STOP;
in[1].after = EXT_INFINITY;
s->fs.opaque = s;
s->fs.on_event = process_frame;
return ff_framesync_configure(&s->fs);
}
static int activate(AVFilterContext *ctx)
{
MidEqualizerContext *s = ctx->priv;
return ff_framesync_activate(&s->fs);
}
static av_cold void uninit(AVFilterContext *ctx)
{
MidEqualizerContext *s = ctx->priv;
ff_framesync_uninit(&s->fs);
av_freep(&s->histogram[0]);
av_freep(&s->histogram[1]);
av_freep(&s->cchange);
}
static const AVFilterPad midequalizer_inputs[] = {
{
.name = "in0",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_input0,
},
{
.name = "in1",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_input1,
},
{ NULL }
};
static const AVFilterPad midequalizer_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_output,
},
{ NULL }
};
AVFilter ff_vf_midequalizer = {
.name = "midequalizer",
.description = NULL_IF_CONFIG_SMALL("Apply Midway Equalization."),
.priv_size = sizeof(MidEqualizerContext),
.uninit = uninit,
.query_formats = query_formats,
.activate = activate,
.inputs = midequalizer_inputs,
.outputs = midequalizer_outputs,
.priv_class = &midequalizer_class,
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL,
};