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/*
* Copyright (c) 2012 Steven Robertson
*
* 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
* copy an alpha component from another video's luma
*/
#include <string.h>
#include "libavutil/imgutils.h"
#include "libavutil/opt.h"
#include "libavutil/pixfmt.h"
#include "avfilter.h"
#include "drawutils.h"
#include "formats.h"
#include "filters.h"
#include "internal.h"
#include "video.h"
enum { Y, U, V, A };
typedef struct AlphaMergeContext {
const AVClass *class;
int is_packed_rgb;
uint8_t rgba_map[4];
AVFrame *main_frame;
AVFrame *alpha_frame;
} AlphaMergeContext;
static int query_formats(AVFilterContext *ctx)
{
static const enum AVPixelFormat main_fmts[] = {
AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA420P,
AV_PIX_FMT_GBRAP,
AV_PIX_FMT_RGBA, AV_PIX_FMT_BGRA, AV_PIX_FMT_ARGB, AV_PIX_FMT_ABGR,
AV_PIX_FMT_NONE
};
static const enum AVPixelFormat alpha_fmts[] = { AV_PIX_FMT_GRAY8, AV_PIX_FMT_NONE };
AVFilterFormats *main_formats = ff_make_format_list(main_fmts);
int ret;
if ((ret = ff_formats_ref(main_formats, &ctx->inputs[0]->out_formats)) < 0 ||
(ret = ff_formats_ref(main_formats, &ctx->outputs[0]->in_formats)) < 0)
return ret;
return ff_formats_ref(ff_make_format_list(alpha_fmts),
&ctx->inputs[1]->out_formats);
}
static int config_input_main(AVFilterLink *inlink)
{
AlphaMergeContext *s = inlink->dst->priv;
s->is_packed_rgb =
ff_fill_rgba_map(s->rgba_map, inlink->format) >= 0 &&
inlink->format != AV_PIX_FMT_GBRAP;
return 0;
}
static int config_output(AVFilterLink *outlink)
{
AVFilterContext *ctx = outlink->src;
AVFilterLink *mainlink = ctx->inputs[0];
AVFilterLink *alphalink = ctx->inputs[1];
if (mainlink->w != alphalink->w || mainlink->h != alphalink->h) {
av_log(ctx, AV_LOG_ERROR,
"Input frame sizes do not match (%dx%d vs %dx%d).\n",
mainlink->w, mainlink->h,
alphalink->w, alphalink->h);
return AVERROR(EINVAL);
}
outlink->w = mainlink->w;
outlink->h = mainlink->h;
outlink->time_base = mainlink->time_base;
outlink->sample_aspect_ratio = mainlink->sample_aspect_ratio;
outlink->frame_rate = mainlink->frame_rate;
return 0;
}
static void draw_frame(AVFilterContext *ctx,
AVFrame *main_buf,
AVFrame *alpha_buf)
{
AlphaMergeContext *s = ctx->priv;
int h = main_buf->height;
if (s->is_packed_rgb) {
int x, y;
uint8_t *pin, *pout;
for (y = 0; y < h; y++) {
pin = alpha_buf->data[0] + y * alpha_buf->linesize[0];
pout = main_buf->data[0] + y * main_buf->linesize[0] + s->rgba_map[A];
for (x = 0; x < main_buf->width; x++) {
*pout = *pin;
pin += 1;
pout += 4;
}
}
} else {
const int main_linesize = main_buf->linesize[A];
const int alpha_linesize = alpha_buf->linesize[Y];
av_image_copy_plane(main_buf->data[A], main_linesize,
alpha_buf->data[Y], alpha_linesize,
FFMIN(main_linesize, alpha_linesize), alpha_buf->height);
}
}
static int activate(AVFilterContext *ctx)
{
AVFilterLink *outlink = ctx->outputs[0];
AlphaMergeContext *s = ctx->priv;
int ret;
FF_FILTER_FORWARD_STATUS_BACK_ALL(outlink, ctx);
if (!s->main_frame) {
ret = ff_inlink_consume_frame(ctx->inputs[0], &s->main_frame);
if (ret < 0)
return ret;
}
if (!s->alpha_frame) {
ret = ff_inlink_consume_frame(ctx->inputs[1], &s->alpha_frame);
if (ret < 0)
return ret;
}
if (s->main_frame && s->alpha_frame) {
if (!ctx->is_disabled)
draw_frame(ctx, s->main_frame, s->alpha_frame);
ret = ff_filter_frame(outlink, s->main_frame);
av_frame_free(&s->alpha_frame);
s->main_frame = NULL;
return ret;
}
FF_FILTER_FORWARD_STATUS(ctx->inputs[0], outlink);
FF_FILTER_FORWARD_STATUS(ctx->inputs[1], outlink);
if (ff_outlink_frame_wanted(ctx->outputs[0]) &&
!ff_outlink_get_status(ctx->inputs[0]) &&
!s->main_frame) {
ff_inlink_request_frame(ctx->inputs[0]);
return 0;
}
if (ff_outlink_frame_wanted(ctx->outputs[0]) &&
!ff_outlink_get_status(ctx->inputs[1]) &&
!s->alpha_frame) {
ff_inlink_request_frame(ctx->inputs[1]);
return 0;
}
return FFERROR_NOT_READY;
}
static const AVFilterPad alphamerge_inputs[] = {
{
.name = "main",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_input_main,
.needs_writable = 1,
},{
.name = "alpha",
.type = AVMEDIA_TYPE_VIDEO,
},
{ NULL }
};
static const AVFilterPad alphamerge_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_output,
},
{ NULL }
};
static const AVOption alphamerge_options[] = {
{ NULL }
};
AVFILTER_DEFINE_CLASS(alphamerge);
AVFilter ff_vf_alphamerge = {
.name = "alphamerge",
.description = NULL_IF_CONFIG_SMALL("Copy the luma value of the second "
"input into the alpha channel of the first input."),
.priv_size = sizeof(AlphaMergeContext),
.priv_class = &alphamerge_class,
.query_formats = query_formats,
.inputs = alphamerge_inputs,
.outputs = alphamerge_outputs,
.activate = activate,
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL,
};
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