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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/pixfmt.h"
#include "avfilter.h"
#include "bufferqueue.h"
#include "drawutils.h"
#include "formats.h"
#include "internal.h"
#include "video.h"
enum { Y, U, V, A };
typedef struct {
int frame_requested;
int is_packed_rgb;
uint8_t rgba_map[4];
struct FFBufQueue queue_main;
struct FFBufQueue queue_alpha;
} AlphaMergeContext;
static av_cold void uninit(AVFilterContext *ctx)
{
AlphaMergeContext *merge = ctx->priv;
ff_bufqueue_discard_all(&merge->queue_main);
ff_bufqueue_discard_all(&merge->queue_alpha);
}
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_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);
AVFilterFormats *alpha_formats = ff_make_format_list(alpha_fmts);
ff_formats_ref(main_formats, &ctx->inputs[0]->out_formats);
ff_formats_ref(alpha_formats, &ctx->inputs[1]->out_formats);
ff_formats_ref(main_formats, &ctx->outputs[0]->in_formats);
return 0;
}
static int config_input_main(AVFilterLink *inlink)
{
AlphaMergeContext *merge = inlink->dst->priv;
merge->is_packed_rgb =
ff_fill_rgba_map(merge->rgba_map, inlink->format) >= 0;
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 *merge = ctx->priv;
int h = main_buf->height;
if (merge->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] + merge->rgba_map[A];
for (x = 0; x < main_buf->width; x++) {
*pout = *pin;
pin += 1;
pout += 4;
}
}
} else {
int y;
const int main_linesize = main_buf->linesize[A];
const int alpha_linesize = alpha_buf->linesize[Y];
for (y = 0; y < h && y < alpha_buf->height; y++) {
memcpy(main_buf->data[A] + y * main_linesize,
alpha_buf->data[Y] + y * alpha_linesize,
FFMIN(main_linesize, alpha_linesize));
}
}
}
static int filter_frame(AVFilterLink *inlink, AVFrame *buf)
{
AVFilterContext *ctx = inlink->dst;
AlphaMergeContext *merge = ctx->priv;
int is_alpha = (inlink == ctx->inputs[1]);
struct FFBufQueue *queue =
(is_alpha ? &merge->queue_alpha : &merge->queue_main);
ff_bufqueue_add(ctx, queue, buf);
while (1) {
AVFrame *main_buf, *alpha_buf;
if (!ff_bufqueue_peek(&merge->queue_main, 0) ||
!ff_bufqueue_peek(&merge->queue_alpha, 0)) break;
main_buf = ff_bufqueue_get(&merge->queue_main);
alpha_buf = ff_bufqueue_get(&merge->queue_alpha);
merge->frame_requested = 0;
draw_frame(ctx, main_buf, alpha_buf);
ff_filter_frame(ctx->outputs[0], main_buf);
av_frame_free(&alpha_buf);
}
return 0;
}
static int request_frame(AVFilterLink *outlink)
{
AVFilterContext *ctx = outlink->src;
AlphaMergeContext *merge = ctx->priv;
int in, ret;
merge->frame_requested = 1;
while (merge->frame_requested) {
in = ff_bufqueue_peek(&merge->queue_main, 0) ? 1 : 0;
ret = ff_request_frame(ctx->inputs[in]);
if (ret < 0)
return ret;
}
return 0;
}
static const AVFilterPad alphamerge_inputs[] = {
{
.name = "main",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_input_main,
.get_video_buffer = ff_null_get_video_buffer,
.filter_frame = filter_frame,
.min_perms = AV_PERM_READ | AV_PERM_WRITE | AV_PERM_PRESERVE,
},{
.name = "alpha",
.type = AVMEDIA_TYPE_VIDEO,
.filter_frame = filter_frame,
.min_perms = AV_PERM_READ | AV_PERM_PRESERVE,
},
{ NULL }
};
static const AVFilterPad alphamerge_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_output,
.request_frame = request_frame,
},
{ NULL }
};
AVFilter avfilter_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."),
.uninit = uninit,
.priv_size = sizeof(AlphaMergeContext),
.query_formats = query_formats,
.inputs = alphamerge_inputs,
.outputs = alphamerge_outputs,
};
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