258 lines
8.1 KiB
C
258 lines
8.1 KiB
C
/*
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* Copyright (c) 2012 Nicolas George
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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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/**
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* @file
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* tile video filter
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*/
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#include "libavutil/opt.h"
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#include "libavutil/pixdesc.h"
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#include "avfilter.h"
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#include "drawutils.h"
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#include "formats.h"
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#include "video.h"
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#include "internal.h"
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typedef struct {
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const AVClass *class;
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unsigned w, h;
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unsigned margin;
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unsigned padding;
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unsigned current;
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unsigned nb_frames;
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FFDrawContext draw;
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FFDrawColor blank;
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} TileContext;
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#define REASONABLE_SIZE 1024
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#define OFFSET(x) offsetof(TileContext, x)
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#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
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static const AVOption tile_options[] = {
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{ "layout", "set grid size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE,
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{.str = "6x5"}, 0, 0, FLAGS },
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{ "margin", "set outer border margin in pixels", OFFSET(margin),
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AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1024, FLAGS },
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{ "padding", "set inner border thickness in pixels", OFFSET(padding),
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AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1024, FLAGS },
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{ "nb_frames", "set maximum number of frame to render", OFFSET(nb_frames),
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AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, FLAGS },
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{NULL},
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};
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AVFILTER_DEFINE_CLASS(tile);
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static av_cold int init(AVFilterContext *ctx, const char *args)
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{
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TileContext *tile = ctx->priv;
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static const char *shorthand[] = { "layout", "nb_frames", "margin", "padding", NULL };
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int ret;
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tile->class = &tile_class;
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av_opt_set_defaults(tile);
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if ((ret = av_opt_set_from_string(tile, args, shorthand, "=", ":")) < 0)
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return ret;
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if (tile->w > REASONABLE_SIZE || tile->h > REASONABLE_SIZE) {
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av_log(ctx, AV_LOG_ERROR, "Tile size %ux%u is insane.\n",
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tile->w, tile->h);
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return AVERROR(EINVAL);
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}
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if (tile->nb_frames == 0) {
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tile->nb_frames = tile->w * tile->h;
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} else if (tile->nb_frames > tile->w * tile->h) {
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av_log(ctx, AV_LOG_ERROR, "nb_frames must be less than or equal to %dx%d=%d\n",
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tile->w, tile->h, tile->w * tile->h);
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return AVERROR(EINVAL);
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}
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return 0;
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}
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static int query_formats(AVFilterContext *ctx)
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{
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ff_set_common_formats(ctx, ff_draw_supported_pixel_formats(0));
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return 0;
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}
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static int config_props(AVFilterLink *outlink)
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{
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AVFilterContext *ctx = outlink->src;
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TileContext *tile = ctx->priv;
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AVFilterLink *inlink = ctx->inputs[0];
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const unsigned total_margin_w = (tile->w - 1) * tile->padding + 2*tile->margin;
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const unsigned total_margin_h = (tile->h - 1) * tile->padding + 2*tile->margin;
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if (inlink->w > (INT_MAX - total_margin_w) / tile->w) {
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av_log(ctx, AV_LOG_ERROR, "Total width %ux%u is too much.\n",
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tile->w, inlink->w);
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return AVERROR(EINVAL);
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}
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if (inlink->h > (INT_MAX - total_margin_h) / tile->h) {
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av_log(ctx, AV_LOG_ERROR, "Total height %ux%u is too much.\n",
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tile->h, inlink->h);
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return AVERROR(EINVAL);
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}
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outlink->w = tile->w * inlink->w + total_margin_w;
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outlink->h = tile->h * inlink->h + total_margin_h;
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outlink->sample_aspect_ratio = inlink->sample_aspect_ratio;
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outlink->frame_rate = av_mul_q(inlink->frame_rate,
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(AVRational){ 1, tile->nb_frames });
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ff_draw_init(&tile->draw, inlink->format, 0);
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/* TODO make the color an option, or find an unified way of choosing it */
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ff_draw_color(&tile->draw, &tile->blank, (uint8_t[]){ 0, 0, 0, -1 });
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return 0;
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}
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static void get_current_tile_pos(AVFilterContext *ctx, unsigned *x, unsigned *y)
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{
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TileContext *tile = ctx->priv;
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AVFilterLink *inlink = ctx->inputs[0];
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const unsigned tx = tile->current % tile->w;
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const unsigned ty = tile->current / tile->w;
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*x = tile->margin + (inlink->w + tile->padding) * tx;
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*y = tile->margin + (inlink->h + tile->padding) * ty;
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}
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static void draw_blank_frame(AVFilterContext *ctx, AVFilterBufferRef *out_buf)
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{
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TileContext *tile = ctx->priv;
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AVFilterLink *inlink = ctx->inputs[0];
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unsigned x0, y0;
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get_current_tile_pos(ctx, &x0, &y0);
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ff_fill_rectangle(&tile->draw, &tile->blank,
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out_buf->data, out_buf->linesize,
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x0, y0, inlink->w, inlink->h);
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tile->current++;
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}
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static int end_last_frame(AVFilterContext *ctx)
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{
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TileContext *tile = ctx->priv;
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AVFilterLink *outlink = ctx->outputs[0];
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AVFilterBufferRef *out_buf = outlink->out_buf;
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int ret;
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outlink->out_buf = NULL;
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while (tile->current < tile->nb_frames)
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draw_blank_frame(ctx, out_buf);
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ret = ff_filter_frame(outlink, out_buf);
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tile->current = 0;
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return ret;
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}
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/* Note: direct rendering is not possible since there is no guarantee that
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* buffers are fed to filter_frame in the order they were obtained from
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* get_buffer (think B-frames). */
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static int filter_frame(AVFilterLink *inlink, AVFilterBufferRef *picref)
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{
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AVFilterContext *ctx = inlink->dst;
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TileContext *tile = ctx->priv;
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AVFilterLink *outlink = ctx->outputs[0];
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unsigned x0, y0;
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if (!tile->current) {
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outlink->out_buf = ff_get_video_buffer(outlink, AV_PERM_WRITE,
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outlink->w, outlink->h);
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if (!outlink->out_buf)
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return AVERROR(ENOMEM);
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avfilter_copy_buffer_ref_props(outlink->out_buf, picref);
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outlink->out_buf->video->w = outlink->w;
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outlink->out_buf->video->h = outlink->h;
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/* fill surface once for margin/padding */
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if (tile->margin || tile->padding)
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ff_fill_rectangle(&tile->draw, &tile->blank,
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outlink->out_buf->data,
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outlink->out_buf->linesize,
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0, 0, outlink->w, outlink->h);
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}
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get_current_tile_pos(ctx, &x0, &y0);
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ff_copy_rectangle2(&tile->draw,
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outlink->out_buf->data, outlink->out_buf->linesize,
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inlink ->cur_buf->data, inlink ->cur_buf->linesize,
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x0, y0, 0, 0, inlink->w, inlink->h);
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avfilter_unref_bufferp(&inlink->cur_buf);
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if (++tile->current == tile->nb_frames)
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return end_last_frame(ctx);
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return 0;
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}
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static int request_frame(AVFilterLink *outlink)
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{
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AVFilterContext *ctx = outlink->src;
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TileContext *tile = ctx->priv;
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AVFilterLink *inlink = ctx->inputs[0];
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int r;
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while (1) {
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r = ff_request_frame(inlink);
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if (r < 0) {
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if (r == AVERROR_EOF && tile->current)
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r = end_last_frame(ctx);
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break;
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}
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if (!tile->current) /* done */
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break;
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}
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return r;
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}
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static const AVFilterPad tile_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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.min_perms = AV_PERM_READ,
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},
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{ NULL }
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};
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static const AVFilterPad tile_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_props,
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.request_frame = request_frame,
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},
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{ NULL }
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};
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AVFilter avfilter_vf_tile = {
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.name = "tile",
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.description = NULL_IF_CONFIG_SMALL("Tile several successive frames together."),
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.init = init,
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.query_formats = query_formats,
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.priv_size = sizeof(TileContext),
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.inputs = tile_inputs,
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.outputs = tile_outputs,
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.priv_class = &tile_class,
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};
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