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/*
* Copyright (c) 2020 Nicolas George
*
* 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/opt.h"
#include "libavutil/pixdesc.h"
#include "avfilter.h"
#include "formats.h"
#include "filters.h"
typedef struct UntileContext {
const AVClass *class;
unsigned w, h;
unsigned current;
unsigned nb_frames;
AVFrame *frame;
const AVPixFmtDescriptor *desc;
int64_t dpts, pts;
int max_step[4];
} UntileContext;
#define OFFSET(x) offsetof(UntileContext, x)
#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
static const AVOption untile_options[] = {
{ "layout", "set grid size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE,
{.str = "6x5"}, 0, 0, FLAGS },
{ NULL }
};
AVFILTER_DEFINE_CLASS(untile);
static av_cold int init(AVFilterContext *ctx)
{
UntileContext *s = ctx->priv;
if (s->w > UINT_MAX / s->h) {
av_log(ctx, AV_LOG_ERROR, "Tile size %ux%u is insane.\n",
s->w, s->h);
return AVERROR(EINVAL);
}
s->nb_frames = s->w * s->h;
return 0;
}
static int query_formats(AVFilterContext *ctx)
{
AVFilterFormats *formats = NULL;
int ret;
ret = ff_formats_pixdesc_filter(&formats, 0,
AV_PIX_FMT_FLAG_HWACCEL |
AV_PIX_FMT_FLAG_BITSTREAM |
FF_PIX_FMT_FLAG_SW_FLAT_SUB);
if (ret < 0)
return ret;
return ff_set_common_formats(ctx, formats);
}
static int config_output(AVFilterLink *outlink)
{
AVFilterContext *ctx = outlink->src;
UntileContext *s = ctx->priv;
AVFilterLink *inlink = ctx->inputs[0];
AVRational dt;
s->desc = av_pix_fmt_desc_get(outlink->format);
if (inlink->w % (s->w << s->desc->log2_chroma_w) ||
inlink->h % (s->h << s->desc->log2_chroma_h)) {
av_log(ctx, AV_LOG_ERROR,
"Input resolution %ux%u not multiple of layout %ux%u.\n",
inlink->w, inlink->h, s->w, s->h);
return AVERROR(EINVAL);
}
outlink->w = inlink->w / s->w;
outlink->h = inlink->h / s->h;
outlink->sample_aspect_ratio = inlink->sample_aspect_ratio;
outlink->frame_rate = av_mul_q(inlink->frame_rate, av_make_q(s->nb_frames, 1));
if (outlink->frame_rate.num)
dt = av_inv_q(outlink->frame_rate);
else
dt = av_mul_q(inlink->time_base, av_make_q(1, s->nb_frames));
outlink->time_base = av_gcd_q(inlink->time_base, dt, AV_TIME_BASE / 2, AV_TIME_BASE_Q);
s->dpts = av_rescale_q(1, dt, outlink->time_base);
av_log(ctx, AV_LOG_VERBOSE, "frame interval: %"PRId64"*%d/%d\n",
s->dpts, dt.num, dt.den);
av_image_fill_max_pixsteps(s->max_step, NULL, s->desc);
return 0;
}
static int activate(AVFilterContext *ctx)
{
UntileContext *s = ctx->priv;
AVFilterLink *inlink = ctx->inputs[0];
AVFilterLink *outlink = ctx->outputs[0];
AVFrame *out;
int i, x, y, ret;
FF_FILTER_FORWARD_STATUS_BACK(outlink, inlink);
if (!s->frame) {
ret = ff_inlink_consume_frame(inlink, &s->frame);
if (ret < 0)
return ret;
if (ret)
s->pts = av_rescale_q(s->frame->pts, inlink->time_base, outlink->time_base);
}
if (s->frame) {
if (s->current == s->nb_frames - 1) {
out = s->frame;
s->frame = NULL;
} else {
out = av_frame_clone(s->frame);
if (!out)
return AVERROR(ENOMEM);
}
x = outlink->w * (s->current % s->w);
y = outlink->h * (s->current / s->w);
out->width = outlink->w;
out->height = outlink->h;
out->data[0] += y * out->linesize[0];
out->data[0] += x * s->max_step[0];
if (!(s->desc->flags & AV_PIX_FMT_FLAG_PAL)) {
for (i = 1; i < 3; i ++) {
if (out->data[i]) {
out->data[i] += (y >> s->desc->log2_chroma_w) * out->linesize[i];
out->data[i] += (x >> s->desc->log2_chroma_h) * s->max_step[i];
}
}
}
if (out->data[3]) {
out->data[3] += y * out->linesize[3];
out->data[3] += x * s->max_step[3];
}
out->pts = s->pts;
s->pts += s->dpts;
if (++s->current == s->nb_frames)
s->current = 0;
return ff_filter_frame(outlink, out);
}
FF_FILTER_FORWARD_STATUS(inlink, outlink);
FF_FILTER_FORWARD_WANTED(outlink, inlink);
return FFERROR_NOT_READY;
}
static av_cold void uninit(AVFilterContext *ctx)
{
UntileContext *s = ctx->priv;
av_frame_free(&s->frame);
}
static const AVFilterPad untile_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
},
};
static const AVFilterPad untile_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_output,
},
};
const AVFilter ff_vf_untile = {
.name = "untile",
.description = NULL_IF_CONFIG_SMALL("Untile a frame into a sequence of frames."),
.init = init,
.uninit = uninit,
.query_formats = query_formats,
.activate = activate,
.priv_size = sizeof(UntileContext),
FILTER_INPUTS(untile_inputs),
FILTER_OUTPUTS(untile_outputs),
.priv_class = &untile_class,
};
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