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/*
* Copyright (c) 2012 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
*/
/**
* @file
* tile video filter
*/
#include "libavutil/pixdesc.h"
#include "avfilter.h"
#include "drawutils.h"
typedef struct {
unsigned w, h;
unsigned current;
FFDrawContext draw;
FFDrawColor blank;
} TileContext;
#define REASONABLE_SIZE 1024
static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
{
TileContext *tile = ctx->priv;
int r;
char dummy;
if (!args)
args = "6x5";
r = sscanf(args, "%ux%u%c", &tile->w, &tile->h, &dummy);
if (r != 2 || !tile->w || !tile->h)
return AVERROR(EINVAL);
if (tile->w > REASONABLE_SIZE || tile->h > REASONABLE_SIZE) {
av_log(ctx, AV_LOG_ERROR, "Tile size %ux%u is insane.\n",
tile->w, tile->h);
return AVERROR(EINVAL);
}
return 0;
}
static int query_formats(AVFilterContext *ctx)
{
avfilter_set_common_pixel_formats(ctx, ff_draw_supported_pixel_formats(0));
return 0;
}
static int config_props(AVFilterLink *outlink)
{
AVFilterContext *ctx = outlink->src;
TileContext *tile = ctx->priv;
AVFilterLink *inlink = ctx->inputs[0];
if (inlink->w > INT_MAX / tile->w) {
av_log(ctx, AV_LOG_ERROR, "Total width %ux%u is too much.\n",
tile->w, inlink->w);
return AVERROR(EINVAL);
}
if (inlink->h > INT_MAX / tile->h) {
av_log(ctx, AV_LOG_ERROR, "Total height %ux%u is too much.\n",
tile->h, inlink->h);
return AVERROR(EINVAL);
}
outlink->w = tile->w * inlink->w;
outlink->h = tile->h * inlink->h;
outlink->sample_aspect_ratio = inlink->sample_aspect_ratio;
outlink->frame_rate = av_mul_q(inlink->frame_rate,
(AVRational){ 1, tile->w * tile->h });
ff_draw_init(&tile->draw, inlink->format, 0);
/* TODO make the color an option, or find an unified way of choosing it */
ff_draw_color(&tile->draw, &tile->blank, (uint8_t[]){ 0, 0, 0, -1 });
return 0;
}
/* Note: direct rendering is not possible since there is no guarantee that
* buffers are fed to start_frame in the order they were obtained from
* get_buffer (think B-frames). */
static void start_frame(AVFilterLink *inlink, AVFilterBufferRef *picref)
{
AVFilterContext *ctx = inlink->dst;
TileContext *tile = ctx->priv;
AVFilterLink *outlink = ctx->outputs[0];
if (tile->current)
return;
outlink->out_buf = avfilter_get_video_buffer(outlink, AV_PERM_WRITE,
outlink->w, outlink->h);
avfilter_copy_buffer_ref_props(outlink->out_buf, picref);
outlink->out_buf->video->w = outlink->w;
outlink->out_buf->video->h = outlink->h;
avfilter_start_frame(outlink, outlink->out_buf);
}
static void draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
{
AVFilterContext *ctx = inlink->dst;
TileContext *tile = ctx->priv;
AVFilterLink *outlink = ctx->outputs[0];
unsigned x0 = inlink->w * (tile->current % tile->w);
unsigned y0 = inlink->h * (tile->current / tile->w);
ff_copy_rectangle2(&tile->draw,
outlink->out_buf->data, outlink->out_buf->linesize,
inlink ->cur_buf->data, inlink ->cur_buf->linesize,
x0, y0 + y, 0, y, inlink->cur_buf->video->w, h);
/* TODO if tile->w == 1 && slice_dir is always 1, we could draw_slice
* immediately. */
}
static void draw_blank_frame(AVFilterContext *ctx)
{
TileContext *tile = ctx->priv;
AVFilterLink *inlink = ctx->inputs[0];
AVFilterLink *outlink = ctx->outputs[0];
unsigned x0 = inlink->w * (tile->current % tile->w);
unsigned y0 = inlink->h * (tile->current / tile->w);
ff_fill_rectangle(&tile->draw, &tile->blank,
outlink->out_buf->data, outlink->out_buf->linesize,
x0, y0, inlink->w, inlink->h);
tile->current++;
}
static void end_last_frame(AVFilterContext *ctx)
{
TileContext *tile = ctx->priv;
AVFilterLink *outlink = ctx->outputs[0];
while (tile->current < tile->w * tile->h)
draw_blank_frame(ctx);
avfilter_draw_slice(outlink, 0, outlink->out_buf->video->h, 1);
avfilter_end_frame(outlink);
tile->current = 0;
}
static void end_frame(AVFilterLink *inlink)
{
AVFilterContext *ctx = inlink->dst;
TileContext *tile = ctx->priv;
avfilter_unref_buffer(inlink->cur_buf);
if (++tile->current == tile->w * tile->h)
end_last_frame(ctx);
}
static int request_frame(AVFilterLink *outlink)
{
AVFilterContext *ctx = outlink->src;
TileContext *tile = ctx->priv;
AVFilterLink *inlink = ctx->inputs[0];
int r;
while (1) {
r = avfilter_request_frame(inlink);
if (r < 0) {
if (r == AVERROR_EOF && tile->current)
end_last_frame(ctx);
else
return r;
break;
}
if (!tile->current) /* done */
break;
}
return 0;
}
AVFilter avfilter_vf_tile = {
.name = "tile",
.description = NULL_IF_CONFIG_SMALL("Tile several successive frames together."),
.init = init,
.query_formats = query_formats,
.priv_size = sizeof(TileContext),
.inputs = (const AVFilterPad[]) {
{ .name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.start_frame = start_frame,
.draw_slice = draw_slice,
.end_frame = end_frame,
.min_perms = AV_PERM_READ, },
{ .name = NULL }
},
.outputs = (const AVFilterPad[]) {
{ .name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_props,
.request_frame = request_frame },
{ .name = NULL }
},
};
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