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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/>.
*/
/** @file src/lib/filter_graph.cc
* @brief A graph of FFmpeg filters.
*/
#include "filter_graph.h"
#include "filter.h"
#include "exceptions.h"
#include "image.h"
extern "C" {
#include <libavfilter/buffersrc.h>
#include <libavfilter/buffersink.h>
#include <libavformat/avio.h>
}
#include <iostream>
#include "i18n.h"
using std::string;
using std::list;
using std::pair;
using std::make_pair;
using std::cout;
using std::vector;
using std::shared_ptr;
using std::weak_ptr;
using dcp::Size;
void
FilterGraph::setup(vector<Filter> const& filters)
{
auto const filters_string = Filter::ffmpeg_string (filters);
if (filters.empty()) {
return;
}
_copy = false;
_frame = av_frame_alloc ();
_graph = avfilter_graph_alloc();
if (!_graph) {
throw DecodeError (N_("could not create filter graph."));
}
auto const buffer_src = avfilter_get_by_name (src_name().c_str());
if (!buffer_src) {
throw DecodeError (N_("could not find buffer src filter"));
}
auto const buffer_sink = avfilter_get_by_name (sink_name().c_str());
if (!buffer_sink) {
throw DecodeError (N_("Could not create buffer sink filter"));
}
if (avfilter_graph_create_filter (&_buffer_src_context, buffer_src, N_("in"), src_parameters().c_str(), 0, _graph) < 0) {
throw DecodeError (N_("could not create buffer source"));
}
#ifdef DCPOMATIC_FFMPEG_8
_buffer_sink_context = avfilter_graph_alloc_filter(_graph, buffer_sink, N_("out"));
if (!_buffer_sink_context) {
throw DecodeError(N_("could not allocate buffer sink."));
}
#else
if (avfilter_graph_create_filter (&_buffer_sink_context, buffer_sink, N_("out"), nullptr, nullptr, _graph) < 0) {
throw DecodeError (N_("could not create buffer sink."));
}
#endif
set_parameters (_buffer_sink_context);
#ifdef DCPOMATIC_FFMPEG_8
if (avfilter_init_dict(_buffer_sink_context, nullptr) < 0) {
throw DecodeError(N_("could not initialise buffer sink."));
}
#endif
auto outputs = avfilter_inout_alloc ();
outputs->name = av_strdup(N_("in"));
outputs->filter_ctx = _buffer_src_context;
outputs->pad_idx = 0;
outputs->next = 0;
auto inputs = avfilter_inout_alloc ();
inputs->name = av_strdup(N_("out"));
inputs->filter_ctx = _buffer_sink_context;
inputs->pad_idx = 0;
inputs->next = 0;
if (avfilter_graph_parse (_graph, filters_string.c_str(), inputs, outputs, 0) < 0) {
throw DecodeError (N_("could not set up filter graph."));
}
int e = avfilter_graph_config (_graph, 0);
if (e < 0) {
throw DecodeError (fmt::format(N_("could not configure filter graph ({})"), e));
}
}
FilterGraph::~FilterGraph ()
{
if (_frame) {
av_frame_free (&_frame);
}
if (_graph) {
avfilter_graph_free (&_graph);
}
}
AVFilterContext *
FilterGraph::get (string name)
{
return avfilter_graph_get_filter (_graph, name.c_str());
}
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