yading@11: /*
yading@11:  * Copyright (c) 2012 Nicolas George
yading@11:  *
yading@11:  * This file is part of FFmpeg.
yading@11:  *
yading@11:  * FFmpeg is free software; you can redistribute it and/or
yading@11:  * modify it under the terms of the GNU Lesser General Public
yading@11:  * License as published by the Free Software Foundation; either
yading@11:  * version 2.1 of the License, or (at your option) any later version.
yading@11:  *
yading@11:  * FFmpeg is distributed in the hope that it will be useful,
yading@11:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@11:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@11:  * Lesser General Public License for more details.
yading@11:  *
yading@11:  * You should have received a copy of the GNU Lesser General Public
yading@11:  * License along with FFmpeg; if not, write to the Free Software
yading@11:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@11:  */
yading@11: 
yading@11: /**
yading@11:  * @file
yading@11:  * tile video filter
yading@11:  */
yading@11: 
yading@11: #include "libavutil/opt.h"
yading@11: #include "libavutil/pixdesc.h"
yading@11: #include "avfilter.h"
yading@11: #include "drawutils.h"
yading@11: #include "formats.h"
yading@11: #include "video.h"
yading@11: #include "internal.h"
yading@11: 
yading@11: typedef struct {
yading@11:     const AVClass *class;
yading@11:     unsigned w, h;
yading@11:     unsigned margin;
yading@11:     unsigned padding;
yading@11:     unsigned current;
yading@11:     unsigned nb_frames;
yading@11:     FFDrawContext draw;
yading@11:     FFDrawColor blank;
yading@11:     AVFrame *out_ref;
yading@11: } TileContext;
yading@11: 
yading@11: #define REASONABLE_SIZE 1024
yading@11: 
yading@11: #define OFFSET(x) offsetof(TileContext, x)
yading@11: #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
yading@11: 
yading@11: static const AVOption tile_options[] = {
yading@11:     { "layout", "set grid size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE,
yading@11:         {.str = "6x5"}, 0, 0, FLAGS },
yading@11:     { "nb_frames", "set maximum number of frame to render", OFFSET(nb_frames),
yading@11:         AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, FLAGS },
yading@11:     { "margin",  "set outer border margin in pixels",    OFFSET(margin),
yading@11:         AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1024, FLAGS },
yading@11:     { "padding", "set inner border thickness in pixels", OFFSET(padding),
yading@11:         AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1024, FLAGS },
yading@11:     {NULL},
yading@11: };
yading@11: 
yading@11: AVFILTER_DEFINE_CLASS(tile);
yading@11: 
yading@11: static av_cold int init(AVFilterContext *ctx)
yading@11: {
yading@11:     TileContext *tile = ctx->priv;
yading@11: 
yading@11:     if (tile->w > REASONABLE_SIZE || tile->h > REASONABLE_SIZE) {
yading@11:         av_log(ctx, AV_LOG_ERROR, "Tile size %ux%u is insane.\n",
yading@11:                tile->w, tile->h);
yading@11:         return AVERROR(EINVAL);
yading@11:     }
yading@11: 
yading@11:     if (tile->nb_frames == 0) {
yading@11:         tile->nb_frames = tile->w * tile->h;
yading@11:     } else if (tile->nb_frames > tile->w * tile->h) {
yading@11:         av_log(ctx, AV_LOG_ERROR, "nb_frames must be less than or equal to %dx%d=%d\n",
yading@11:                tile->w, tile->h, tile->w * tile->h);
yading@11:         return AVERROR(EINVAL);
yading@11:     }
yading@11: 
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int query_formats(AVFilterContext *ctx)
yading@11: {
yading@11:     ff_set_common_formats(ctx, ff_draw_supported_pixel_formats(0));
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int config_props(AVFilterLink *outlink)
yading@11: {
yading@11:     AVFilterContext *ctx = outlink->src;
yading@11:     TileContext *tile    = ctx->priv;
yading@11:     AVFilterLink *inlink = ctx->inputs[0];
yading@11:     const unsigned total_margin_w = (tile->w - 1) * tile->padding + 2*tile->margin;
yading@11:     const unsigned total_margin_h = (tile->h - 1) * tile->padding + 2*tile->margin;
yading@11: 
yading@11:     if (inlink->w > (INT_MAX - total_margin_w) / tile->w) {
yading@11:         av_log(ctx, AV_LOG_ERROR, "Total width %ux%u is too much.\n",
yading@11:                tile->w, inlink->w);
yading@11:         return AVERROR(EINVAL);
yading@11:     }
yading@11:     if (inlink->h > (INT_MAX - total_margin_h) / tile->h) {
yading@11:         av_log(ctx, AV_LOG_ERROR, "Total height %ux%u is too much.\n",
yading@11:                tile->h, inlink->h);
yading@11:         return AVERROR(EINVAL);
yading@11:     }
yading@11:     outlink->w = tile->w * inlink->w + total_margin_w;
yading@11:     outlink->h = tile->h * inlink->h + total_margin_h;
yading@11:     outlink->sample_aspect_ratio = inlink->sample_aspect_ratio;
yading@11:     outlink->frame_rate = av_mul_q(inlink->frame_rate,
yading@11:                                    (AVRational){ 1, tile->nb_frames });
yading@11:     ff_draw_init(&tile->draw, inlink->format, 0);
yading@11:     /* TODO make the color an option, or find an unified way of choosing it */
yading@11:     ff_draw_color(&tile->draw, &tile->blank, (uint8_t[]){ 0, 0, 0, -1 });
yading@11: 
yading@11:     outlink->flags |= FF_LINK_FLAG_REQUEST_LOOP;
yading@11: 
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static void get_current_tile_pos(AVFilterContext *ctx, unsigned *x, unsigned *y)
yading@11: {
yading@11:     TileContext *tile    = ctx->priv;
yading@11:     AVFilterLink *inlink = ctx->inputs[0];
yading@11:     const unsigned tx = tile->current % tile->w;
yading@11:     const unsigned ty = tile->current / tile->w;
yading@11: 
yading@11:     *x = tile->margin + (inlink->w + tile->padding) * tx;
yading@11:     *y = tile->margin + (inlink->h + tile->padding) * ty;
yading@11: }
yading@11: 
yading@11: static void draw_blank_frame(AVFilterContext *ctx, AVFrame *out_buf)
yading@11: {
yading@11:     TileContext *tile    = ctx->priv;
yading@11:     AVFilterLink *inlink = ctx->inputs[0];
yading@11:     unsigned x0, y0;
yading@11: 
yading@11:     get_current_tile_pos(ctx, &x0, &y0);
yading@11:     ff_fill_rectangle(&tile->draw, &tile->blank,
yading@11:                       out_buf->data, out_buf->linesize,
yading@11:                       x0, y0, inlink->w, inlink->h);
yading@11:     tile->current++;
yading@11: }
yading@11: static int end_last_frame(AVFilterContext *ctx)
yading@11: {
yading@11:     TileContext *tile     = ctx->priv;
yading@11:     AVFilterLink *outlink = ctx->outputs[0];
yading@11:     AVFrame *out_buf = tile->out_ref;
yading@11:     int ret;
yading@11: 
yading@11:     while (tile->current < tile->nb_frames)
yading@11:         draw_blank_frame(ctx, out_buf);
yading@11:     ret = ff_filter_frame(outlink, out_buf);
yading@11:     tile->current = 0;
yading@11:     return ret;
yading@11: }
yading@11: 
yading@11: /* Note: direct rendering is not possible since there is no guarantee that
yading@11:  * buffers are fed to filter_frame in the order they were obtained from
yading@11:  * get_buffer (think B-frames). */
yading@11: 
yading@11: static int filter_frame(AVFilterLink *inlink, AVFrame *picref)
yading@11: {
yading@11:     AVFilterContext *ctx  = inlink->dst;
yading@11:     TileContext *tile     = ctx->priv;
yading@11:     AVFilterLink *outlink = ctx->outputs[0];
yading@11:     unsigned x0, y0;
yading@11: 
yading@11:     if (!tile->current) {
yading@11:         tile->out_ref = ff_get_video_buffer(outlink, outlink->w, outlink->h);
yading@11:         if (!tile->out_ref)
yading@11:             return AVERROR(ENOMEM);
yading@11:         av_frame_copy_props(tile->out_ref, picref);
yading@11:         tile->out_ref->width  = outlink->w;
yading@11:         tile->out_ref->height = outlink->h;
yading@11: 
yading@11:         /* fill surface once for margin/padding */
yading@11:         if (tile->margin || tile->padding)
yading@11:             ff_fill_rectangle(&tile->draw, &tile->blank,
yading@11:                               tile->out_ref->data,
yading@11:                               tile->out_ref->linesize,
yading@11:                               0, 0, outlink->w, outlink->h);
yading@11:     }
yading@11: 
yading@11:     get_current_tile_pos(ctx, &x0, &y0);
yading@11:     ff_copy_rectangle2(&tile->draw,
yading@11:                        tile->out_ref->data, tile->out_ref->linesize,
yading@11:                        picref->data, picref->linesize,
yading@11:                        x0, y0, 0, 0, inlink->w, inlink->h);
yading@11: 
yading@11:     av_frame_free(&picref);
yading@11:     if (++tile->current == tile->nb_frames)
yading@11:         return end_last_frame(ctx);
yading@11: 
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int request_frame(AVFilterLink *outlink)
yading@11: {
yading@11:     AVFilterContext *ctx = outlink->src;
yading@11:     TileContext *tile    = ctx->priv;
yading@11:     AVFilterLink *inlink = ctx->inputs[0];
yading@11:     int r;
yading@11: 
yading@11:     r = ff_request_frame(inlink);
yading@11:     if (r == AVERROR_EOF && tile->current)
yading@11:         r = end_last_frame(ctx);
yading@11:     return r;
yading@11: }
yading@11: 
yading@11: static const AVFilterPad tile_inputs[] = {
yading@11:     {
yading@11:         .name         = "default",
yading@11:         .type         = AVMEDIA_TYPE_VIDEO,
yading@11:         .filter_frame = filter_frame,
yading@11:     },
yading@11:     { NULL }
yading@11: };
yading@11: 
yading@11: static const AVFilterPad tile_outputs[] = {
yading@11:     {
yading@11:         .name          = "default",
yading@11:         .type          = AVMEDIA_TYPE_VIDEO,
yading@11:         .config_props  = config_props,
yading@11:         .request_frame = request_frame,
yading@11:     },
yading@11:     { NULL }
yading@11: };
yading@11: 
yading@11: AVFilter avfilter_vf_tile = {
yading@11:     .name          = "tile",
yading@11:     .description   = NULL_IF_CONFIG_SMALL("Tile several successive frames together."),
yading@11:     .init          = init,
yading@11:     .query_formats = query_formats,
yading@11:     .priv_size     = sizeof(TileContext),
yading@11:     .inputs        = tile_inputs,
yading@11:     .outputs       = tile_outputs,
yading@11:     .priv_class    = &tile_class,
yading@11: };