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/* |
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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/pixdesc.h" |
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#include "avfilter.h" |
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#include "drawutils.h" |
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typedef struct { |
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unsigned w, h; |
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unsigned current; |
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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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static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque) |
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{ |
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TileContext *tile = ctx->priv; |
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int r; |
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char dummy; |
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if (!args) |
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args = "6x5"; |
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r = sscanf(args, "%ux%u%c", &tile->w, &tile->h, &dummy); |
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if (r != 2 || !tile->w || !tile->h) |
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return AVERROR(EINVAL); |
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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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return 0; |
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} |
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static int query_formats(AVFilterContext *ctx) |
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{ |
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avfilter_set_common_pixel_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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if (inlink->w > INT_MAX / 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 / 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; |
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outlink->h = tile->h * inlink->h; |
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outlink->sample_aspect_ratio = inlink->sample_aspect_ratio; |
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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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/* Note: direct rendering is not possible since there is no guarantee that |
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* buffers are fed to start_frame in the order they were obtained from |
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* get_buffer (think B-frames). */ |
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static void start_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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if (tile->current) |
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return; |
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outlink->out_buf = avfilter_get_video_buffer(outlink, AV_PERM_WRITE, |
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outlink->w, outlink->h); |
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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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avfilter_start_frame(outlink, outlink->out_buf); |
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} |
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static void draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir) |
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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 = inlink->w * (tile->current % tile->w); |
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unsigned y0 = inlink->h * (tile->current / tile->w); |
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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 + y, 0, y, inlink->cur_buf->video->w, h); |
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/* TODO if tile->w == 1 && slice_dir is always 1, we could draw_slice |
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* immediately. */ |
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} |
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static void draw_blank_frame(AVFilterContext *ctx) |
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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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AVFilterLink *outlink = ctx->outputs[0]; |
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unsigned x0 = inlink->w * (tile->current % tile->w); |
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unsigned y0 = inlink->h * (tile->current / tile->w); |
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ff_fill_rectangle(&tile->draw, &tile->blank, |
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outlink->out_buf->data, outlink->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 void 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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while (tile->current < tile->w * tile->h) |
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draw_blank_frame(ctx); |
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avfilter_draw_slice(outlink, 0, outlink->out_buf->video->h, 1); |
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avfilter_end_frame(outlink); |
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tile->current = 0; |
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} |
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static void end_frame(AVFilterLink *inlink) |
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{ |
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AVFilterContext *ctx = inlink->dst; |
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TileContext *tile = ctx->priv; |
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avfilter_unref_buffer(inlink->cur_buf); |
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if (++tile->current == tile->w * tile->h) |
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end_last_frame(ctx); |
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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 = avfilter_request_frame(inlink); |
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if (r < 0) { |
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if (r == AVERROR_EOF && tile->current) |
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end_last_frame(ctx); |
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else |
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return r; |
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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 0; |
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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 = (const AVFilterPad[]) { |
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{ .name = "default", |
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.type = AVMEDIA_TYPE_VIDEO, |
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.start_frame = start_frame, |
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.draw_slice = draw_slice, |
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.end_frame = end_frame, |
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.min_perms = AV_PERM_READ, }, |
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{ .name = NULL } |
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}, |
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.outputs = (const AVFilterPad[]) { |
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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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{ .name = NULL } |
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}, |
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}; |