diff options
Diffstat (limited to 'libavfilter/vf_tile.c')
| -rw-r--r-- | libavfilter/vf_tile.c | 215 |
1 files changed, 215 insertions, 0 deletions
diff --git a/libavfilter/vf_tile.c b/libavfilter/vf_tile.c new file mode 100644 index 0000000000..52d53ebcc1 --- /dev/null +++ b/libavfilter/vf_tile.c @@ -0,0 +1,215 @@ +/* + * 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" +#include "formats.h" +#include "video.h" +#include "internal.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) +{ + 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) +{ + ff_set_common_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 int start_frame(AVFilterLink *inlink, AVFilterBufferRef *picref) +{ + AVFilterContext *ctx = inlink->dst; + TileContext *tile = ctx->priv; + AVFilterLink *outlink = ctx->outputs[0]; + + if (tile->current) + return 0; + outlink->out_buf = ff_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; + return 0; +} + +static int 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. */ + return 0; +} + +static void draw_blank_frame(AVFilterContext *ctx, AVFilterBufferRef *out_buf) +{ + TileContext *tile = ctx->priv; + AVFilterLink *inlink = ctx->inputs[0]; + unsigned x0 = inlink->w * (tile->current % tile->w); + unsigned y0 = inlink->h * (tile->current / tile->w); + + ff_fill_rectangle(&tile->draw, &tile->blank, + out_buf->data, 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]; + AVFilterBufferRef *out_buf = outlink->out_buf; + + outlink->out_buf = NULL; + ff_start_frame(outlink, out_buf); + while (tile->current < tile->w * tile->h) + draw_blank_frame(ctx, out_buf); + ff_draw_slice(outlink, 0, out_buf->video->h, 1); + ff_end_frame(outlink); + tile->current = 0; +} + +static int end_frame(AVFilterLink *inlink) +{ + AVFilterContext *ctx = inlink->dst; + TileContext *tile = ctx->priv; + + avfilter_unref_bufferp(&inlink->cur_buf); + if (++tile->current == tile->w * tile->h) + end_last_frame(ctx); + return 0; +} + +static int request_frame(AVFilterLink *outlink) +{ + AVFilterContext *ctx = outlink->src; + TileContext *tile = ctx->priv; + AVFilterLink *inlink = ctx->inputs[0]; + int r; + + while (1) { + r = ff_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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