Browse Source

Add video vertical flip filter.

Originally committed as revision 20352 to svn://svn.ffmpeg.org/ffmpeg/trunk
tags/v0.6
Stefano Sabatini 15 years ago
parent
commit
c38ae71f54
4 changed files with 112 additions and 0 deletions
  1. +8
    -0
      doc/libavfilter.texi
  2. +1
    -0
      libavfilter/Makefile
  3. +1
    -0
      libavfilter/allfilters.c
  4. +102
    -0
      libavfilter/vf_vflip.c

+ 8
- 0
doc/libavfilter.texi View File

@@ -115,4 +115,12 @@ The default value of ``w'' and ``h'' is 0.

Pass the source unchanged to the output.

@section vflip

Flip the input video vertically.

@example
./ffmpeg -i in.avi -vfilters "vflip" out.avi
@end example

@bye

+ 1
- 0
libavfilter/Makefile View File

@@ -13,5 +13,6 @@ OBJS = allfilters.o \

OBJS-$(CONFIG_CROP_FILTER) += vf_crop.o
OBJS-$(CONFIG_NULL_FILTER) += vf_null.o
OBJS-$(CONFIG_VFLIP_FILTER) += vf_vflip.o

include $(SUBDIR)../subdir.mak

+ 1
- 0
libavfilter/allfilters.c View File

@@ -36,4 +36,5 @@ void avfilter_register_all(void)

REGISTER_FILTER (CROP,crop,vf);
REGISTER_FILTER (NULL,null,vf);
REGISTER_FILTER (VFLIP,vflip,vf);
}

+ 102
- 0
libavfilter/vf_vflip.c View File

@@ -0,0 +1,102 @@
/*
* copyright (c) 2007 Bobby Bingham
*
* 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 libavfilter/vf_vflip.c
* video vertical flip filter
*/

#include "avfilter.h"

typedef struct {
int vsub; ///< vertical chroma subsampling
} FlipContext;

static int config_input(AVFilterLink *link)
{
FlipContext *flip = link->dst->priv;
int tmp;

avcodec_get_chroma_sub_sample(link->format, &tmp, &flip->vsub);

return 0;
}

static AVFilterPicRef *get_video_buffer(AVFilterLink *link, int perms,
int w, int h)
{
FlipContext *flip = link->dst->priv;
int i;

AVFilterPicRef *picref = avfilter_get_video_buffer(link->dst->outputs[0],
perms, w, h);

picref->data[0] += (h-1) * picref->linesize[0];
picref->linesize[0] = -picref->linesize[0];
for (i = 1; i < 4; i ++) {
if (picref->data[i]) {
picref->data[i] += ((h >> flip->vsub)-1) * picref->linesize[i];
picref->linesize[i] = -picref->linesize[i];
}
}

return picref;
}

static void start_frame(AVFilterLink *link, AVFilterPicRef *picref)
{
FlipContext *flip = link->dst->priv;
AVFilterPicRef *ref2 = avfilter_ref_pic(picref, ~0);
int i;

ref2->data[0] += (link->h-1) * ref2->linesize[0];
ref2->linesize[0] = -ref2->linesize[0];
for (i = 1; i < 4; i ++) {
if (ref2->data[i]) {
ref2->data[i] += ((link->h >> flip->vsub)-1) * ref2->linesize[i];
ref2->linesize[i] = -ref2->linesize[i];
}
}

avfilter_start_frame(link->dst->outputs[0], ref2);
}

static void draw_slice(AVFilterLink *link, int y, int h)
{
AVFilterContext *ctx = link->dst;

avfilter_draw_slice(ctx->outputs[0], link->h - (y+h), h);
}

AVFilter avfilter_vf_vflip = {
.name = "vflip",
.priv_size = sizeof(FlipContext),

.inputs = (AVFilterPad[]) {{ .name = "default",
.type = CODEC_TYPE_VIDEO,
.get_video_buffer = get_video_buffer,
.start_frame = start_frame,
.draw_slice = draw_slice,
.config_props = config_input, },
{ .name = NULL}},
.outputs = (AVFilterPad[]) {{ .name = "default",
.type = CODEC_TYPE_VIDEO, },
{ .name = NULL}},
};

Loading…
Cancel
Save