[FFmpeg-devel] [PATCH 6/6] lavfi: add tile video filter.
Nicolas George
nicolas.george at normalesup.org
Sun Mar 11 00:29:50 CET 2012
Signed-off-by: Nicolas George <nicolas.george at normalesup.org>
---
Changelog | 1 +
doc/filters.texi | 16 ++++
libavfilter/Makefile | 1 +
libavfilter/allfilters.c | 1 +
libavfilter/vf_tile.c | 206 ++++++++++++++++++++++++++++++++++++++++++++++
5 files changed, 225 insertions(+), 0 deletions(-)
create mode 100644 libavfilter/vf_tile.c
diff --git a/Changelog b/Changelog
index 6b17483..20d4e29 100644
--- a/Changelog
+++ b/Changelog
@@ -14,6 +14,7 @@ version next:
- blackdetect filter
- libutvideo encoder wrapper (--enable-libutvideo)
- swapuv filter
+- tile video filter
version 0.10:
diff --git a/doc/filters.texi b/doc/filters.texi
index b13d5f5..730c58e 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -2653,6 +2653,22 @@ Complete example of a thumbnail creation with @command{ffmpeg}:
ffmpeg -i in.avi -vf thumbnail,scale=300:200 -frames:v 1 out.png
@end example
+ at section tile
+
+Tile several successive frames together.
+
+It accepts as argument the tile size (i.e. the number of lines and columns)
+in the form "@var{w}x at var{h}".
+
+For example, produce 8×8 PNG tiles of all keyframes (@option{-skip_frame
+nokey}) in a movie:
+ at example
+ffmpeg -skip_frame nokey -i file.avi -vf 'scale=128:72,tile=8x8' -an -vsync 0 keyframes%03d.png
+ at end example
+The @option{-vsync 0} is necessary to prevent @command{ffmpeg} from
+duplicating each output frame to accomodate the originally detected frame
+rate.
+
@section tinterlace
Perform various types of temporal field interlacing.
diff --git a/libavfilter/Makefile b/libavfilter/Makefile
index d12c2e5..e77e8c6 100644
--- a/libavfilter/Makefile
+++ b/libavfilter/Makefile
@@ -89,6 +89,7 @@ OBJS-$(CONFIG_SLICIFY_FILTER) += vf_slicify.o
OBJS-$(CONFIG_SPLIT_FILTER) += vf_split.o
OBJS-$(CONFIG_SWAPUV_FILTER) += vf_swapuv.o
OBJS-$(CONFIG_THUMBNAIL_FILTER) += vf_thumbnail.o
+OBJS-$(CONFIG_TILE_FILTER) += vf_tile.o
OBJS-$(CONFIG_TINTERLACE_FILTER) += vf_tinterlace.o
OBJS-$(CONFIG_TRANSPOSE_FILTER) += vf_transpose.o
OBJS-$(CONFIG_UNSHARP_FILTER) += vf_unsharp.o
diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c
index f0a7f8b..336d69a 100644
--- a/libavfilter/allfilters.c
+++ b/libavfilter/allfilters.c
@@ -97,6 +97,7 @@ void avfilter_register_all(void)
REGISTER_FILTER (SPLIT, split, vf);
REGISTER_FILTER (SWAPUV, swapuv, vf);
REGISTER_FILTER (THUMBNAIL, thumbnail, vf);
+ REGISTER_FILTER (TILE, tile, vf);
REGISTER_FILTER (TINTERLACE, tinterlace, vf);
REGISTER_FILTER (TRANSPOSE, transpose, vf);
REGISTER_FILTER (UNSHARP, unsharp, vf);
diff --git a/libavfilter/vf_tile.c b/libavfilter/vf_tile.c
new file mode 100644
index 0000000..031757a
--- /dev/null
+++ b/libavfilter/vf_tile.c
@@ -0,0 +1,206 @@
+/*
+ * 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;
+ 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 }
+ },
+};
--
1.7.9.1
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