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FFmpeg/libavfilter/vf_stack.c

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/*
* 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"
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#include "framesync.h"
#include "video.h"
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typedef struct StackItem {
int x[4], y[4];
int linesize[4];
int height[4];
} StackItem;
typedef struct StackContext {
const AVClass *class;
const AVPixFmtDescriptor *desc;
int nb_inputs;
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char *layout;
int shortest;
int is_vertical;
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int is_horizontal;
int nb_planes;
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StackItem *items;
AVFrame **frames;
FFFrameSync fs;
} StackContext;
static int query_formats(AVFilterContext *ctx)
{
AVFilterFormats *pix_fmts = NULL;
int fmt, ret;
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) &&
(ret = ff_add_format(&pix_fmts, fmt)) < 0)
return ret;
}
return ff_set_common_formats(ctx, pix_fmts);
}
static av_cold int init(AVFilterContext *ctx)
{
StackContext *s = ctx->priv;
int i, ret;
if (!strcmp(ctx->filter->name, "vstack"))
s->is_vertical = 1;
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if (!strcmp(ctx->filter->name, "hstack"))
s->is_horizontal = 1;
s->frames = av_calloc(s->nb_inputs, sizeof(*s->frames));
if (!s->frames)
return AVERROR(ENOMEM);
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if (!strcmp(ctx->filter->name, "xstack")) {
if (!s->layout) {
if (s->nb_inputs == 2) {
s->layout = av_strdup("0_0|w0_0");
if (!s->layout)
return AVERROR(ENOMEM);
} else {
av_log(ctx, AV_LOG_ERROR, "No layout specified.\n");
return AVERROR(EINVAL);
}
}
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s->items = av_calloc(s->nb_inputs, sizeof(*s->items));
if (!s->items)
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);
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++) {
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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);
out->sample_aspect_ratio = outlink->sample_aspect_ratio;
for (i = 0; i < s->nb_inputs; i++) {
AVFilterLink *inlink = ctx->inputs[i];
int linesize[4];
int height[4];
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if (s->is_horizontal || s->is_vertical) {
if ((ret = av_image_fill_linesizes(linesize, inlink->format, inlink->w)) < 0) {
av_frame_free(&out);
return ret;
}
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height[1] = height[2] = AV_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];
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} else if (s->is_horizontal) {
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];
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} else {
StackItem *item = &s->items[i];
av_image_copy_plane(out->data[p] + out->linesize[p] * item->y[p] + item->x[p],
out->linesize[p],
in[i]->data[p],
in[i]->linesize[p],
item->linesize[p], item->height[p]);
}
}
}
return ff_filter_frame(outlink, out);
}
static int config_output(AVFilterLink *outlink)
{
AVFilterContext *ctx = outlink->src;
StackContext *s = ctx->priv;
AVRational frame_rate = ctx->inputs[0]->frame_rate;
AVRational sar = ctx->inputs[0]->sample_aspect_ratio;
int height = ctx->inputs[0]->h;
int width = ctx->inputs[0]->w;
FFFrameSyncIn *in;
int i, ret;
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s->desc = av_pix_fmt_desc_get(outlink->format);
if (!s->desc)
return AVERROR_BUG;
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;
}
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} else if (s->is_horizontal) {
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;
}
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} else {
char *arg, *p = s->layout, *saveptr = NULL;
char *arg2, *p2, *saveptr2 = NULL;
char *arg3, *p3, *saveptr3 = NULL;
int inw, inh, size;
for (i = 0; i < s->nb_inputs; i++) {
AVFilterLink *inlink = ctx->inputs[i];
StackItem *item = &s->items[i];
if (!(arg = av_strtok(p, "|", &saveptr)))
return AVERROR(EINVAL);
p = NULL;
if ((ret = av_image_fill_linesizes(item->linesize, inlink->format, inlink->w)) < 0) {
return ret;
}
item->height[1] = item->height[2] = AV_CEIL_RSHIFT(inlink->h, s->desc->log2_chroma_h);
item->height[0] = item->height[3] = inlink->h;
p2 = arg;
inw = inh = 0;
for (int j = 0; j < 2; j++) {
if (!(arg2 = av_strtok(p2, "_", &saveptr2)))
return AVERROR(EINVAL);
p2 = NULL;
p3 = arg2;
while ((arg3 = av_strtok(p3, "+", &saveptr3))) {
p3 = NULL;
if (sscanf(arg3, "w%d", &size) == 1) {
if (size == i || size < 0 || size >= s->nb_inputs)
return AVERROR(EINVAL);
if (!j)
inw += ctx->inputs[size]->w;
else
inh += ctx->inputs[size]->w;
} else if (sscanf(arg3, "h%d", &size) == 1) {
if (size == i || size < 0 || size >= s->nb_inputs)
return AVERROR(EINVAL);
if (!j)
inw += ctx->inputs[size]->h;
else
inh += ctx->inputs[size]->h;
} else if (sscanf(arg3, "%d", &size) == 1) {
if (size < 0)
return AVERROR(EINVAL);
if (!j)
inw += size;
else
inh += size;
} else {
return AVERROR(EINVAL);
}
}
}
if ((ret = av_image_fill_linesizes(item->x, inlink->format, inw)) < 0) {
return ret;
}
item->y[1] = item->y[2] = AV_CEIL_RSHIFT(inh, s->desc->log2_chroma_h);
item->y[0] = item->y[3] = inh;
width = FFMAX(width, inlink->w + inw);
height = FFMAX(height, inlink->h + inh);
}
}
s->nb_planes = av_pix_fmt_count_planes(outlink->format);
outlink->w = width;
outlink->h = height;
outlink->frame_rate = frame_rate;
outlink->sample_aspect_ratio = sar;
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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 = s->shortest ? EXT_STOP : EXT_INFINITY;
}
ret = ff_framesync_configure(&s->fs);
outlink->time_base = s->fs.time_base;
return ret;
}
static av_cold void uninit(AVFilterContext *ctx)
{
StackContext *s = ctx->priv;
int i;
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ff_framesync_uninit(&s->fs);
av_freep(&s->frames);
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av_freep(&s->items);
for (i = 0; i < ctx->nb_inputs; i++)
av_freep(&ctx->input_pads[i].name);
}
static int activate(AVFilterContext *ctx)
{
StackContext *s = ctx->priv;
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return ff_framesync_activate(&s->fs);
}
#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 },
{ "shortest", "force termination when the shortest input terminates", OFFSET(shortest), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, .flags = FLAGS },
{ NULL },
};
static const AVFilterPad outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_output,
},
{ 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,
.activate = activate,
.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,
.activate = activate,
.flags = AVFILTER_FLAG_DYNAMIC_INPUTS,
};
#endif /* CONFIG_VSTACK_FILTER */
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#if CONFIG_XSTACK_FILTER
static const AVOption xstack_options[] = {
{ "inputs", "set number of inputs", OFFSET(nb_inputs), AV_OPT_TYPE_INT, {.i64=2}, 2, INT_MAX, .flags = FLAGS },
{ "layout", "set custom layout", OFFSET(layout), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, .flags = FLAGS },
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{ "shortest", "force termination when the shortest input terminates", OFFSET(shortest), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, .flags = FLAGS },
{ NULL },
};
AVFILTER_DEFINE_CLASS(xstack);
AVFilter ff_vf_xstack = {
.name = "xstack",
.description = NULL_IF_CONFIG_SMALL("Stack video inputs into custom layout."),
.priv_size = sizeof(StackContext),
.priv_class = &xstack_class,
.query_formats = query_formats,
.outputs = outputs,
.init = init,
.uninit = uninit,
.activate = activate,
.flags = AVFILTER_FLAG_DYNAMIC_INPUTS,
};
#endif /* CONFIG_XSTACK_FILTER */