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/*
Copyright (C) 2012-2021 Carl Hetherington <cth@carlh.net>
This file is part of DCP-o-matic.
DCP-o-matic is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
DCP-o-matic 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with DCP-o-matic. If not, see <http://www.gnu.org/licenses/>.
*/
#include "dcpomatic_assert.h"
#include "exceptions.h"
#include "image.h"
#include "video_filter_graph.h"
#include <dcp/scope_guard.h>
extern "C" {
#include <libavfilter/buffersrc.h>
#include <libavfilter/buffersink.h>
#include <libavutil/opt.h>
#include <libavutil/pixdesc.h>
}
#include "i18n.h"
using std::list;
using std::make_pair;
using std::make_shared;
using std::pair;
using std::shared_ptr;
using std::string;
VideoFilterGraph::VideoFilterGraph (dcp::Size s, AVPixelFormat p, dcp::Fraction r)
: _size (s)
, _pixel_format (p)
, _frame_rate (r)
{
}
list<shared_ptr<const Image>>
VideoFilterGraph::process(shared_ptr<const Image> image)
{
if (_copy) {
return { image };
}
auto frame = av_frame_alloc();
if (!frame) {
throw std::bad_alloc();
}
dcp::ScopeGuard sg = [&frame]() { av_frame_free(&frame); };
for (int i = 0; i < image->planes(); ++i) {
frame->data[i] = image->data()[i];
frame->linesize[i] = image->stride()[i];
}
frame->width = image->size().width;
frame->height = image->size().height;
frame->format = image->pixel_format();
int r = av_buffersrc_write_frame(_buffer_src_context, frame);
if (r < 0) {
throw DecodeError(fmt::format(N_("could not push buffer into filter chain ({})."), r));
}
list<shared_ptr<const Image>> images;
while (true) {
if (av_buffersink_get_frame(_buffer_sink_context, _frame) < 0) {
break;
}
images.push_back(make_shared<Image>(_frame, Image::Alignment::PADDED));
av_frame_unref (_frame);
}
return images;
}
/** Take an AVFrame and process it using our configured filters, returning a
* set of Images. Caller handles memory management of the input frame.
*/
list<pair<shared_ptr<const Image>, int64_t>>
VideoFilterGraph::process (AVFrame* frame)
{
list<pair<shared_ptr<const Image>, int64_t>> images;
if (_copy) {
images.push_back (make_pair(make_shared<Image>(frame, Image::Alignment::PADDED), frame->best_effort_timestamp));
} else {
int r = av_buffersrc_write_frame (_buffer_src_context, frame);
if (r < 0) {
throw DecodeError (fmt::format(N_("could not push buffer into filter chain ({})."), r));
}
while (true) {
if (av_buffersink_get_frame (_buffer_sink_context, _frame) < 0) {
break;
}
images.push_back (make_pair(make_shared<Image>(_frame, Image::Alignment::PADDED), frame->best_effort_timestamp));
av_frame_unref (_frame);
}
}
return images;
}
/** @param s Image size.
* @param p Pixel format.
* @return true if this chain can process images with `s' and `p', otherwise false.
*/
bool
VideoFilterGraph::can_process (dcp::Size s, AVPixelFormat p) const
{
return (_size == s && _pixel_format == p);
}
string
VideoFilterGraph::src_parameters () const
{
char buffer[256];
snprintf (
buffer, sizeof(buffer),
"video_size=%dx%d:pix_fmt=%d:frame_rate=%d/%d:time_base=1/1:pixel_aspect=1/1",
_size.width, _size.height,
_pixel_format,
_frame_rate.numerator, _frame_rate.denominator
);
return buffer;
}
void
VideoFilterGraph::set_parameters (AVFilterContext* context) const
{
#ifdef DCPOMATIC_FFMPEG_8
auto const r = av_opt_set(context, "pixel_formats", av_get_pix_fmt_name(_pixel_format), AV_OPT_SEARCH_CHILDREN);
#else
AVPixelFormat pix_fmts[] = { _pixel_format, AV_PIX_FMT_NONE };
int r = av_opt_set_int_list (context, "pix_fmts", pix_fmts, AV_PIX_FMT_NONE, AV_OPT_SEARCH_CHILDREN);
#endif
DCPOMATIC_ASSERT (r >= 0);
}
string
VideoFilterGraph::src_name () const
{
return "buffer";
}
string
VideoFilterGraph::sink_name () const
{
return "buffersink";
}
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