+/*
+ Copyright (C) 2014-2018 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 "ffmpeg_image_proxy.h"
+#include "cross.h"
+#include "exceptions.h"
+#include "dcpomatic_socket.h"
+#include "image.h"
+#include "compose.hpp"
+#include "util.h"
+#include <dcp/raw_convert.h>
+extern "C" {
+#include <libavcodec/avcodec.h>
+#include <libavformat/avformat.h>
+}
+#include <libxml++/libxml++.h>
+#include <iostream>
+
+#include "i18n.h"
+
+using std::string;
+using std::cout;
+using std::pair;
+using std::min;
+using std::make_pair;
+using boost::shared_ptr;
+using boost::optional;
+using boost::dynamic_pointer_cast;
+using dcp::raw_convert;
+
+FFmpegImageProxy::FFmpegImageProxy (boost::filesystem::path path)
+ : _data (path)
+ , _pos (0)
+ , _path (path)
+{
+
+}
+
+FFmpegImageProxy::FFmpegImageProxy (dcp::Data data)
+ : _data (data)
+ , _pos (0)
+{
+
+}
+
+FFmpegImageProxy::FFmpegImageProxy (shared_ptr<cxml::Node>, shared_ptr<Socket> socket)
+ : _pos (0)
+{
+ uint32_t const size = socket->read_uint32 ();
+ _data = dcp::Data (size);
+ socket->read (_data.data().get(), size);
+}
+
+static int
+avio_read_wrapper (void* data, uint8_t* buffer, int amount)
+{
+ return reinterpret_cast<FFmpegImageProxy*>(data)->avio_read (buffer, amount);
+}
+
+static int64_t
+avio_seek_wrapper (void* data, int64_t offset, int whence)
+{
+ return reinterpret_cast<FFmpegImageProxy*>(data)->avio_seek (offset, whence);
+}
+
+int
+FFmpegImageProxy::avio_read (uint8_t* buffer, int const amount)
+{
+ int const to_do = min(int64_t(amount), _data.size() - _pos);
+ memcpy (buffer, _data.data().get() + _pos, to_do);
+ _pos += to_do;
+ return to_do;
+}
+
+int64_t
+FFmpegImageProxy::avio_seek (int64_t const pos, int whence)
+{
+ switch (whence) {
+ case AVSEEK_SIZE:
+ return _data.size();
+ case SEEK_CUR:
+ _pos += pos;
+ break;
+ case SEEK_SET:
+ _pos = pos;
+ break;
+ case SEEK_END:
+ _pos = _data.size() - pos;
+ break;
+ }
+
+ return _pos;
+}
+
+pair<shared_ptr<Image>, int>
+FFmpegImageProxy::image (optional<dcp::NoteHandler>, optional<dcp::Size>) const
+{
+ boost::mutex::scoped_lock lm (_mutex);
+
+ if (_image) {
+ return make_pair (_image, 0);
+ }
+
+ uint8_t* avio_buffer = static_cast<uint8_t*> (wrapped_av_malloc(4096));
+ AVIOContext* avio_context = avio_alloc_context (avio_buffer, 4096, 0, const_cast<FFmpegImageProxy*>(this), avio_read_wrapper, 0, avio_seek_wrapper);
+ AVFormatContext* format_context = avformat_alloc_context ();
+ format_context->pb = avio_context;
+
+ AVDictionary* options = 0;
+ /* These durations are in microseconds, and represent how far into the content file
+ we will look for streams.
+ */
+ av_dict_set (&options, "analyzeduration", raw_convert<string>(5 * 60 * 1000000).c_str(), 0);
+ av_dict_set (&options, "probesize", raw_convert<string>(5 * 60 * 1000000).c_str(), 0);
+
+ int e = avformat_open_input (&format_context, 0, 0, &options);
+ if (e < 0) {
+ throw OpenFileError (_path->string(), e, true);
+ }
+
+ if (avformat_find_stream_info(format_context, 0) < 0) {
+ throw DecodeError (_("could not find stream information"));
+ }
+
+ DCPOMATIC_ASSERT (format_context->nb_streams == 1);
+
+ AVFrame* frame = av_frame_alloc ();
+ if (!frame) {
+ throw DecodeError (N_("could not allocate frame"));
+ }
+
+ AVCodecContext* codec_context = format_context->streams[0]->codec;
+ AVCodec* codec = avcodec_find_decoder (codec_context->codec_id);
+ DCPOMATIC_ASSERT (codec);
+
+ if (avcodec_open2 (codec_context, codec, 0) < 0) {
+ throw DecodeError (N_("could not open decoder"));
+ }
+
+ AVPacket packet;
+ int r = av_read_frame (format_context, &packet);
+ if (r < 0) {
+ throw DecodeError (N_("could not read frame"));
+ }
+
+ int frame_finished;
+ if (avcodec_decode_video2(codec_context, frame, &frame_finished, &packet) < 0 || !frame_finished) {
+ throw DecodeError (N_("could not decode video"));
+ }
+
+ _image.reset (new Image (frame));
+
+ av_frame_free (&frame);
+ avformat_close_input (&format_context);
+ av_free (avio_context->buffer);
+ av_free (avio_context);
+
+ return make_pair (_image, 0);
+}
+
+void
+FFmpegImageProxy::add_metadata (xmlpp::Node* node) const
+{
+ node->add_child("Type")->add_child_text (N_("FFmpeg"));
+}
+
+void
+FFmpegImageProxy::send_binary (shared_ptr<Socket> socket) const
+{
+ socket->write (_data.size());
+ socket->write (_data.data().get(), _data.size());
+}
+
+bool
+FFmpegImageProxy::same (shared_ptr<const ImageProxy> other) const
+{
+ shared_ptr<const FFmpegImageProxy> mp = dynamic_pointer_cast<const FFmpegImageProxy> (other);
+ if (!mp) {
+ return false;
+ }
+
+ if (_data.size() != mp->_data.size()) {
+ return false;
+ }
+
+ return memcmp (_data.data().get(), mp->_data.data().get(), _data.size()) == 0;
+}
+
+size_t
+FFmpegImageProxy::memory_used () const
+{
+ size_t m = _data.size();
+ if (_image) {
+ m += _image->memory_used();
+ }
+ return m;
+}