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/*
* Copyright (c) 2007 Benoit Fouet
* Copyright (c) 2010 Stefano Sabatini
*
* This file is part of Libav.
*
* 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.
*
* 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 Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* horizontal flip filter
*/
#include <string.h>
#include "avfilter.h"
#include "formats.h"
#include "internal.h"
#include "video.h"
#include "libavutil/pixdesc.h"
#include "libavutil/internal.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/imgutils.h"
typedef struct {
int max_step[4]; ///< max pixel step for each plane, expressed as a number of bytes
int hsub, vsub; ///< chroma subsampling
} FlipContext;
static int query_formats(AVFilterContext *ctx)
{
static const enum AVPixelFormat pix_fmts[] = {
AV_PIX_FMT_RGB48BE, AV_PIX_FMT_RGB48LE,
AV_PIX_FMT_BGR48BE, AV_PIX_FMT_BGR48LE,
AV_PIX_FMT_ARGB, AV_PIX_FMT_RGBA,
AV_PIX_FMT_ABGR, AV_PIX_FMT_BGRA,
AV_PIX_FMT_RGB24, AV_PIX_FMT_BGR24,
AV_PIX_FMT_RGB565BE, AV_PIX_FMT_RGB565LE,
AV_PIX_FMT_RGB555BE, AV_PIX_FMT_RGB555LE,
AV_PIX_FMT_BGR565BE, AV_PIX_FMT_BGR565LE,
AV_PIX_FMT_BGR555BE, AV_PIX_FMT_BGR555LE,
AV_PIX_FMT_GRAY16BE, AV_PIX_FMT_GRAY16LE,
AV_PIX_FMT_YUV420P16LE, AV_PIX_FMT_YUV420P16BE,
AV_PIX_FMT_YUV422P16LE, AV_PIX_FMT_YUV422P16BE,
AV_PIX_FMT_YUV444P16LE, AV_PIX_FMT_YUV444P16BE,
AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV422P,
AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV411P,
AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV440P,
AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ422P,
AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ440P,
AV_PIX_FMT_YUVA420P,
AV_PIX_FMT_RGB8, AV_PIX_FMT_BGR8,
AV_PIX_FMT_RGB4_BYTE, AV_PIX_FMT_BGR4_BYTE,
AV_PIX_FMT_PAL8, AV_PIX_FMT_GRAY8,
AV_PIX_FMT_NONE
};
ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
return 0;
}
static int config_props(AVFilterLink *inlink)
{
FlipContext *flip = inlink->dst->priv;
const AVPixFmtDescriptor *pix_desc = av_pix_fmt_desc_get(inlink->format);
av_image_fill_max_pixsteps(flip->max_step, NULL, pix_desc);
flip->hsub = pix_desc->log2_chroma_w;
flip->vsub = pix_desc->log2_chroma_h;
return 0;
}
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
{
AVFilterContext *ctx = inlink->dst;
FlipContext *flip = ctx->priv;
AVFilterLink *outlink = ctx->outputs[0];
AVFrame *out;
uint8_t *inrow, *outrow;
int i, j, plane, step, hsub, vsub;
out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
if (!out) {
av_frame_free(&in);
return AVERROR(ENOMEM);
}
av_frame_copy_props(out, in);
for (plane = 0; plane < 4 && in->data[plane]; plane++) {
step = flip->max_step[plane];
hsub = (plane == 1 || plane == 2) ? flip->hsub : 0;
vsub = (plane == 1 || plane == 2) ? flip->vsub : 0;
outrow = out->data[plane];
inrow = in ->data[plane] + ((inlink->w >> hsub) - 1) * step;
for (i = 0; i < in->height >> vsub; i++) {
switch (step) {
case 1:
for (j = 0; j < (inlink->w >> hsub); j++)
outrow[j] = inrow[-j];
break;
case 2:
{
uint16_t *outrow16 = (uint16_t *)outrow;
uint16_t * inrow16 = (uint16_t *) inrow;
for (j = 0; j < (inlink->w >> hsub); j++)
outrow16[j] = inrow16[-j];
}
break;
case 3:
{
uint8_t *in = inrow;
uint8_t *out = outrow;
for (j = 0; j < (inlink->w >> hsub); j++, out += 3, in -= 3) {
int32_t v = AV_RB24(in);
AV_WB24(out, v);
}
}
break;
case 4:
{
uint32_t *outrow32 = (uint32_t *)outrow;
uint32_t * inrow32 = (uint32_t *) inrow;
for (j = 0; j < (inlink->w >> hsub); j++)
outrow32[j] = inrow32[-j];
}
break;
default:
for (j = 0; j < (inlink->w >> hsub); j++)
memcpy(outrow + j*step, inrow - j*step, step);
}
inrow += in ->linesize[plane];
outrow += out->linesize[plane];
}
}
av_frame_free(&in);
return ff_filter_frame(outlink, out);
}
static const AVFilterPad avfilter_vf_hflip_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.filter_frame = filter_frame,
.config_props = config_props,
},
{ NULL }
};
static const AVFilterPad avfilter_vf_hflip_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
},
{ NULL }
};
AVFilter avfilter_vf_hflip = {
.name = "hflip",
.description = NULL_IF_CONFIG_SMALL("Horizontally flip the input video."),
.priv_size = sizeof(FlipContext),
.query_formats = query_formats,
.inputs = avfilter_vf_hflip_inputs,
.outputs = avfilter_vf_hflip_outputs,
};
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