/*
* Copyright (c) 2015 Paul B. Mahol
*
* 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
*/
#include "libavutil/avstring.h"
#include "libavutil/imgutils.h"
#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
#include "avfilter.h"
#include "formats.h"
#include "internal.h"
#include "framesync.h"
#include "video.h"
typedef struct StackContext {
const AVClass *class;
const AVPixFmtDescriptor *desc;
int nb_inputs;
int is_vertical;
int nb_planes;
AVFrame **frames;
FFFrameSync fs;
} StackContext;
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_PAL ||
desc->flags & AV_PIX_FMT_FLAG_HWACCEL ||
desc->flags & AV_PIX_FMT_FLAG_BITSTREAM))
ff_add_format(&pix_fmts, fmt);
}
return ff_set_common_formats(ctx, pix_fmts);
}
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
{
StackContext *s = inlink->dst->priv;
return ff_framesync_filter_frame(&s->fs, inlink, in);
}
static av_cold int init(AVFilterContext *ctx)
{
StackContext *s = ctx->priv;
int i, ret;
if (!strcmp(ctx
->filter
->name
, "vstack")) s->is_vertical = 1;
s->frames = av_calloc(s->nb_inputs, sizeof(*s->frames));
if (!s->frames)
return AVERROR(ENOMEM);
for (i = 0; i < s->nb_inputs; i++) {
AVFilterPad pad = { 0 };
pad.type = AVMEDIA_TYPE_VIDEO;
pad.name = av_asprintf("input%d", i);
if (!pad.name)
return AVERROR(ENOMEM);
pad.filter_frame = filter_frame;
if ((ret = ff_insert_inpad(ctx, i, &pad)) < 0) {
av_freep(&pad.name);
return ret;
}
}
return 0;
}
static int process_frame(FFFrameSync *fs)
{
AVFilterContext *ctx = fs->parent;
AVFilterLink *outlink = ctx->outputs[0];
StackContext *s = fs->opaque;
AVFrame **in = s->frames;
AVFrame *out;
int i, p, ret, offset[4] = { 0 };
for (i = 0; i < s->nb_inputs; i++) {
if ((ret = ff_framesync_get_frame(&s->fs, i, &in[i], 0)) < 0)
return ret;
}
out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
if (!out)
return AVERROR(ENOMEM);
out->pts = av_rescale_q(s->fs.pts, s->fs.time_base, outlink->time_base);
for (i = 0; i < s->nb_inputs; i++) {
AVFilterLink *inlink = ctx->inputs[i];
int linesize[4];
int height[4];
if ((ret = av_image_fill_linesizes(linesize, inlink->format, inlink->w)) < 0) {
av_frame_free(&out);
return ret;
}
height[1] = height[2] = FF_CEIL_RSHIFT(inlink->h, s->desc->log2_chroma_h);
height[0] = height[3] = inlink->h;
for (p = 0; p < s->nb_planes; p++) {
if (s->is_vertical) {
av_image_copy_plane(out->data[p] + offset[p] * out->linesize[p],
out->linesize[p],
in[i]->data[p],
in[i]->linesize[p],
linesize[p], height[p]);
offset[p] += height[p];
} else {
av_image_copy_plane(out->data[p] + offset[p],
out->linesize[p],
in[i]->data[p],
in[i]->linesize[p],
linesize[p], height[p]);
offset[p] += linesize[p];
}
}
}
return ff_filter_frame(outlink, out);
}
static int config_output(AVFilterLink *outlink)
{
AVFilterContext *ctx = outlink->src;
StackContext *s = ctx->priv;
AVRational time_base = ctx->inputs[0]->time_base;
AVRational frame_rate = ctx->inputs[0]->frame_rate;
int height = ctx->inputs[0]->h;
int width = ctx->inputs[0]->w;
FFFrameSyncIn *in;
int i, ret;
if (s->is_vertical) {
for (i = 1; i < s->nb_inputs; i++) {
if (ctx->inputs[i]->w != width) {
av_log(ctx, AV_LOG_ERROR, "Input %d width %d does not match input %d width %d.\n", i, ctx->inputs[i]->w, 0, width);
return AVERROR(EINVAL);
}
height += ctx->inputs[i]->h;
}
} else {
for (i = 1; i < s->nb_inputs; i++) {
if (ctx->inputs[i]->h != height) {
av_log(ctx, AV_LOG_ERROR, "Input %d height %d does not match input %d height %d.\n", i, ctx->inputs[i]->h, 0, height);
return AVERROR(EINVAL);
}
width += ctx->inputs[i]->w;
}
}
s->desc = av_pix_fmt_desc_get(outlink->format);
if (!s->desc)
return AVERROR_BUG;
s->nb_planes = av_pix_fmt_count_planes(outlink->format);
outlink->w = width;
outlink->h = height;
outlink->time_base = time_base;
outlink->frame_rate = frame_rate;
if ((ret = ff_framesync_init(&s->fs, ctx, s->nb_inputs)) < 0)
return ret;
in = s->fs.in;
s->fs.opaque = s;
s->fs.on_event = process_frame;
for (i = 0; i < s->nb_inputs; i++) {
AVFilterLink *inlink = ctx->inputs[i];
in[i].time_base = inlink->time_base;
in[i].sync = 1;
in[i].before = EXT_STOP;
in[i].after = EXT_INFINITY;
}
return ff_framesync_configure(&s->fs);
}
static int request_frame(AVFilterLink *outlink)
{
StackContext *s = outlink->src->priv;
return ff_framesync_request_frame(&s->fs, outlink);
}
static av_cold void uninit(AVFilterContext *ctx)
{
StackContext *s = ctx->priv;
ff_framesync_uninit(&s->fs);
av_freep(&s->frames);
}
#define OFFSET(x) offsetof(StackContext, x)
#define FLAGS AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_FILTERING_PARAM
static const AVOption stack_options[] = {
{ "inputs", "set number of inputs", OFFSET(nb_inputs), AV_OPT_TYPE_INT, {.i64=2}, 2, INT_MAX, .flags = FLAGS },
{ NULL },
};
static const AVFilterPad outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_output,
.request_frame = request_frame,
},
{ NULL }
};
#if CONFIG_HSTACK_FILTER
#define hstack_options stack_options
AVFILTER_DEFINE_CLASS(hstack);
AVFilter ff_vf_hstack = {
.name = "hstack",
.description = NULL_IF_CONFIG_SMALL("Stack video inputs horizontally."),
.priv_size = sizeof(StackContext),
.priv_class = &hstack_class,
.query_formats = query_formats,
.outputs = outputs,
.init = init,
.uninit = uninit,
.flags = AVFILTER_FLAG_DYNAMIC_INPUTS,
};
#endif /* CONFIG_HSTACK_FILTER */
#if CONFIG_VSTACK_FILTER
#define vstack_options stack_options
AVFILTER_DEFINE_CLASS(vstack);
AVFilter ff_vf_vstack = {
.name = "vstack",
.description = NULL_IF_CONFIG_SMALL("Stack video inputs vertically."),
.priv_size = sizeof(StackContext),
.priv_class = &vstack_class,
.query_formats = query_formats,
.outputs = outputs,
.init = init,
.uninit = uninit,
.flags = AVFILTER_FLAG_DYNAMIC_INPUTS,
};
#endif /* CONFIG_VSTACK_FILTER */