/*
* Copyright (c) 2007 Benoit Fouet
* Copyright (c) 2010 Stefano Sabatini
*
* 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
* 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 FlipContext {
int max_step[4]; ///< max pixel step for each plane, expressed as a number of bytes
int planewidth[4]; ///< width of each plane
int planeheight[4]; ///< height of each plane
} FlipContext;
static int query_formats(AVFilterContext *ctx)
{
AVFilterFormats *pix_fmts = NULL;
int fmt;
for (fmt = 0; av_pix_fmt_desc_get(fmt); fmt++) {
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(fmt);
if (!(desc->flags & AV_PIX_FMT_FLAG_HWACCEL ||
desc->flags & AV_PIX_FMT_FLAG_BITSTREAM ||
(desc->log2_chroma_w != desc->log2_chroma_h &&
desc->comp[0].plane == desc->comp[1].plane)))
ff_add_format(&pix_fmts, fmt);
}
return ff_set_common_formats(ctx, pix_fmts);
}
static int config_props(AVFilterLink *inlink)
{
FlipContext *s = inlink->dst->priv;
const AVPixFmtDescriptor *pix_desc = av_pix_fmt_desc_get(inlink->format);
const int hsub = pix_desc->log2_chroma_w;
const int vsub = pix_desc->log2_chroma_h;
av_image_fill_max_pixsteps(s->max_step, NULL, pix_desc);
s->planewidth[0] = s->planewidth[3] = inlink->w;
s->planewidth[1] = s->planewidth[2] = FF_CEIL_RSHIFT(inlink->w, hsub);
s->planeheight[0] = s->planeheight[3] = inlink->h;
s->planeheight[1] = s->planeheight[2] = FF_CEIL_RSHIFT(inlink->h, vsub);
return 0;
}
typedef struct ThreadData {
AVFrame *in, *out;
} ThreadData;
static int filter_slice(AVFilterContext *ctx, void *arg, int job, int nb_jobs)
{
FlipContext *s = ctx->priv;
ThreadData *td = arg;
AVFrame *in = td->in;
AVFrame *out = td->out;
uint8_t *inrow, *outrow;
int i, j, plane, step;
for (plane = 0; plane < 4 && in->data[plane] && in->linesize[plane]; plane++) {
const int width = s->planewidth[plane];
const int height = s->planeheight[plane];
const int start = (height * job ) / nb_jobs;
const int end = (height * (job+1)) / nb_jobs;
step = s->max_step[plane];
outrow = out->data[plane] + start * out->linesize[plane];
inrow = in ->data[plane] + start * in->linesize[plane] + (width - 1) * step;
for (i = start; i < end; i++) {
switch (step) {
case 1:
for (j = 0; j < width; j++)
outrow[j] = inrow[-j];
break;
case 2:
{
uint16_t *outrow16 = (uint16_t *)outrow;
uint16_t * inrow16 = (uint16_t *) inrow;
for (j = 0; j < width; j++)
outrow16[j] = inrow16[-j];
}
break;
case 3:
{
uint8_t *in = inrow;
uint8_t *out = outrow;
for (j = 0; j < width; 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 < width; j++)
outrow32[j] = inrow32[-j];
}
break;
default:
for (j = 0; j < width; j++)
memcpy(outrow
+ j
*step
, inrow
- j
*step
, step
); }
inrow += in ->linesize[plane];
outrow += out->linesize[plane];
}
}
return 0;
}
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
{
AVFilterContext *ctx = inlink->dst;
AVFilterLink *outlink = ctx->outputs[0];
ThreadData td;
AVFrame *out;
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);
/* copy palette if required */
if (av_pix_fmt_desc_get(inlink->format)->flags & AV_PIX_FMT_FLAG_PAL)
memcpy(out
->data
[1], in
->data
[1], AVPALETTE_SIZE
);
td.in = in, td.out = out;
ctx->internal->execute(ctx, filter_slice, &td, NULL, FFMIN(outlink->h, ctx->graph->nb_threads));
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 ff_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,
.flags = AVFILTER_FLAG_SLICE_THREADS,
};