/*
- * copyright (c) 2007 Bobby Bingham
+ * Copyright (c) 2007 Bobby Bingham
*
- * This file is part of FFmpeg.
+ * This file is part of Libav.
*
- * FFmpeg is free software; you can redistribute it and/or
+ * Libav 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,
+ * Libav 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
+ * License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
- * @file libavfilter/vf_slicify.c
+ * @file
* video slicing filter
*/
#include "avfilter.h"
+#include "libavutil/pixdesc.h"
typedef struct {
int h; ///< output slice height
int vshift; ///< vertical chroma subsampling shift
+ uint32_t lcg_state; ///< LCG state used to compute random slice height
+ int use_random_h; ///< enable the use of random slice height values
} SliceContext;
static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
SliceContext *slice = ctx->priv;
slice->h = 16;
- if (args)
- sscanf(args, "%d", &slice->h);
-
+ if (args) {
+ if (!strcmp(args, "random")) {
+ slice->use_random_h = 1;
+ } else {
+ sscanf(args, "%d", &slice->h);
+ }
+ }
return 0;
}
static int config_props(AVFilterLink *link)
{
SliceContext *slice = link->dst->priv;
- int tmp;
-
- avcodec_get_chroma_sub_sample(link->format, &tmp, &slice->vshift);
-
- /* ensure that slices play nice with chroma subsampling, and enforce
- * a reasonable minimum size for the slices */
- slice->h = FFMAX(8, slice->h & (-1 << slice->vshift));
- av_log(link->dst, AV_LOG_INFO, "h:%d\n", slice->h);
+ slice->vshift = av_pix_fmt_descriptors[link->format].log2_chroma_h;
return 0;
}
-static AVFilterPicRef *get_video_buffer(AVFilterLink *link, int perms,
- int w, int h)
+static void start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
{
- return avfilter_get_video_buffer(link->dst->outputs[0], perms, w, h);
-}
+ SliceContext *slice = link->dst->priv;
-static void start_frame(AVFilterLink *link, AVFilterPicRef *picref)
-{
- avfilter_start_frame(link->dst->outputs[0], picref);
-}
+ if (slice->use_random_h) {
+ slice->lcg_state = slice->lcg_state * 1664525 + 1013904223;
+ slice->h = 8 + (uint64_t)slice->lcg_state * 25 / UINT32_MAX;
+ }
-static void end_frame(AVFilterLink *link)
-{
- avfilter_end_frame(link->dst->outputs[0]);
+ /* ensure that slices play nice with chroma subsampling, and enforce
+ * a reasonable minimum size for the slices */
+ slice->h = FFMAX(8, slice->h & (-1 << slice->vshift));
+
+ av_log(link->dst, AV_LOG_DEBUG, "h:%d\n", slice->h);
+
+ avfilter_start_frame(link->dst->outputs[0], picref);
}
static void draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
int y2;
if (slice_dir == 1) {
- for (y2 = y; y2 + slice->h <= y + h; y2 += slice->h)
- avfilter_draw_slice(link->dst->outputs[0], y2, slice->h, slice_dir);
+ for (y2 = y; y2 + slice->h <= y + h; y2 += slice->h)
+ avfilter_draw_slice(link->dst->outputs[0], y2, slice->h, slice_dir);
- if (y2 < y + h)
- avfilter_draw_slice(link->dst->outputs[0], y2, y + h - y2, slice_dir);
+ if (y2 < y + h)
+ avfilter_draw_slice(link->dst->outputs[0], y2, y + h - y2, slice_dir);
} else if (slice_dir == -1) {
for (y2 = y + h; y2 - slice->h >= y; y2 -= slice->h)
avfilter_draw_slice(link->dst->outputs[0], y2 - slice->h, slice->h, slice_dir);
AVFilter avfilter_vf_slicify = {
.name = "slicify",
- .description = "Pass the images of input video on to next video filter as multiple slices.",
+ .description = NULL_IF_CONFIG_SMALL("Pass the images of input video on to next video filter as multiple slices."),
.init = init,
.priv_size = sizeof(SliceContext),
.inputs = (AVFilterPad[]) {{ .name = "default",
- .type = CODEC_TYPE_VIDEO,
- .get_video_buffer = get_video_buffer,
+ .type = AVMEDIA_TYPE_VIDEO,
+ .get_video_buffer = avfilter_null_get_video_buffer,
.start_frame = start_frame,
.draw_slice = draw_slice,
.config_props = config_props,
- .end_frame = end_frame, },
+ .end_frame = avfilter_null_end_frame, },
{ .name = NULL}},
.outputs = (AVFilterPad[]) {{ .name = "default",
- .type = CODEC_TYPE_VIDEO, },
+ .type = AVMEDIA_TYPE_VIDEO, },
{ .name = NULL}},
};
projects / ffmpeg / blobdiff