Basic video transcoding working.

1 files changed, 210 insertions, 0 deletions

diff --git a/src/lib/ffmpeg_transcoder.cc b/src/lib/ffmpeg_transcoder.cc
new file mode 100644
index 000000000..21a626462
--- /dev/null
+++ b/src/lib/ffmpeg_transcoder.cc
@@ -0,0 +1,210 @@
+/*
+    Copyright (C) 2017 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_transcoder.h"
+#include "film.h"
+#include "job.h"
+#include "player.h"
+#include "player_video.h"
+#include "log.h"
+#include "image.h"
+#include "compose.hpp"
+
+#include "i18n.h"
+
+using std::string;
+using std::runtime_error;
+using boost::shared_ptr;
+using boost::bind;
+using boost::weak_ptr;
+
+static AVPixelFormat
+force_pixel_format (AVPixelFormat, AVPixelFormat out)
+{
+	return out;
+}
+
+FFmpegTranscoder::FFmpegTranscoder (shared_ptr<const Film> film, weak_ptr<Job> job)
+	: Transcoder (film, job)
+	, _pixel_format (AV_PIX_FMT_YUV422P10)
+{
+
+}
+
+void
+FFmpegTranscoder::go ()
+{
+	string const codec_name = "prores_ks";
+	AVCodec* codec = avcodec_find_encoder_by_name (codec_name.c_str());
+	if (!codec) {
+		throw runtime_error (String::compose ("could not find FFmpeg codec %1", codec_name));
+	}
+
+	_codec_context = avcodec_alloc_context3 (codec);
+	if (!_codec_context) {
+		throw runtime_error ("could not allocate FFmpeg context");
+	}
+
+	avcodec_get_context_defaults3 (_codec_context, codec);
+
+	/* Variable quantisation */
+	_codec_context->global_quality = 0;
+	_codec_context->width = _film->frame_size().width;
+	_codec_context->height = _film->frame_size().height;
+	_codec_context->time_base = (AVRational) { 1, _film->video_frame_rate() };
+	_codec_context->pix_fmt = _pixel_format;
+	_codec_context->flags |= CODEC_FLAG_QSCALE | CODEC_FLAG_GLOBAL_HEADER;
+
+	boost::filesystem::path filename = _film->file(_film->isdcf_name(true) + ".mov");
+	avformat_alloc_output_context2 (&_format_context, 0, 0, filename.string().c_str());
+	if (!_format_context) {
+		throw runtime_error ("could not allocate FFmpeg format context");
+	}
+
+	_video_stream = avformat_new_stream (_format_context, codec);
+	if (!_video_stream) {
+		throw runtime_error ("could not create FFmpeg output video stream");
+	}
+
+	/* Note: needs to increment with each stream */
+	_video_stream->id = 0;
+	_video_stream->codec = _codec_context;
+
+	AVDictionary* options = 0;
+	av_dict_set (&options, "profile", "3", 0);
+	av_dict_set (&options, "threads", "auto", 0);
+
+	if (avcodec_open2 (_codec_context, codec, &options) < 0) {
+		throw runtime_error ("could not open FFmpeg codec");
+	}
+
+	if (avio_open (&_format_context->pb, filename.c_str(), AVIO_FLAG_WRITE) < 0) {
+		throw runtime_error ("could not open FFmpeg output file");
+	}
+
+	if (avformat_write_header (_format_context, &options) < 0) {
+		throw runtime_error ("could not write header to FFmpeg output file");
+	}
+
+	{
+		shared_ptr<Job> job = _job.lock ();
+		DCPOMATIC_ASSERT (job);
+		job->sub (_("Encoding"));
+	}
+
+	while (!_player->pass ()) {}
+
+	while (true) {
+		AVPacket packet;
+		av_init_packet (&packet);
+		packet.data = 0;
+		packet.size = 0;
+
+		int got_packet;
+		avcodec_encode_video2 (_codec_context, &packet, 0, &got_packet);
+		if (!got_packet) {
+			break;
+		}
+
+		packet.stream_index = 0;
+		av_interleaved_write_frame (_format_context, &packet);
+		av_packet_unref (&packet);
+	}
+
+	av_write_trailer (_format_context);
+
+	avcodec_close (_codec_context);
+	avio_close (_format_context->pb);
+	avformat_free_context (_format_context);
+}
+
+void
+FFmpegTranscoder::video (shared_ptr<PlayerVideo> video, DCPTime time)
+{
+	shared_ptr<Image> image = video->image (
+		bind (&Log::dcp_log, _film->log().get(), _1, _2),
+		bind (&force_pixel_format, _1, _pixel_format),
+		true,
+		false
+		);
+
+	AVFrame* frame = av_frame_alloc ();
+
+	for (int i = 0; i < 3; ++i) {
+		size_t const size = image->stride()[i] * image->size().height;
+		AVBufferRef* buffer = av_buffer_alloc (size);
+		/* XXX: inefficient */
+		memcpy (buffer->data, image->data()[i], size);
+		frame->buf[i] = av_buffer_ref (buffer);
+		frame->data[i] = buffer->data;
+		frame->linesize[i] = image->stride()[i];
+		av_buffer_unref (&buffer);
+	}
+
+	frame->width = image->size().width;
+	frame->height = image->size().height;
+	frame->format = _pixel_format;
+	frame->pts = time.frames_round(_film->video_frame_rate()) / (_film->video_frame_rate() * av_q2d (_video_stream->time_base));
+
+	AVPacket packet;
+	av_init_packet (&packet);
+	packet.data = 0;
+	packet.size = 0;
+
+	int got_packet;
+	if (avcodec_encode_video2 (_codec_context, &packet, frame, &got_packet) < 0) {
+		throw EncodeError ("FFmpeg video encode failed");
+	}
+
+	if (got_packet && packet.size) {
+		/* XXX: this should not be hard-wired */
+		packet.stream_index = 0;
+		av_interleaved_write_frame (_format_context, &packet);
+		av_packet_unref (&packet);
+	}
+
+	av_frame_free (&frame);
+}
+
+void
+FFmpegTranscoder::audio (shared_ptr<AudioBuffers> audio, DCPTime time)
+{
+
+}
+
+void
+FFmpegTranscoder::subtitle (PlayerSubtitles subs, DCPTimePeriod period)
+{
+
+}
+
+float
+FFmpegTranscoder::current_encoding_rate () const
+{
+	/* XXX */
+	return 1;
+}
+
+int
+FFmpegTranscoder::video_frames_enqueued () const
+{
+	/* XXX */
+	return 1;
+}