Split parts of FFmpegEncoder into FFmpegFileEncoder.

1 files changed, 377 insertions, 0 deletions

diff --git a/src/lib/ffmpeg_file_encoder.cc b/src/lib/ffmpeg_file_encoder.cc
new file mode 100644
index 000000000..97a342e29
--- /dev/null
+++ b/src/lib/ffmpeg_file_encoder.cc
@@ -0,0 +1,377 @@
+/*
+    Copyright (C) 2017-2018 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_encoder.h"
+#include "film.h"
+#include "job.h"
+#include "player.h"
+#include "player_video.h"
+#include "log.h"
+#include "image.h"
+#include "cross.h"
+#include "butler.h"
+#include "compose.hpp"
+#include <iostream>
+
+#include "i18n.h"
+
+using std::string;
+using std::runtime_error;
+using std::cout;
+using std::pair;
+using boost::shared_ptr;
+using boost::bind;
+using boost::weak_ptr;
+
+int FFmpegFileEncoder::_video_stream_index = 0;
+int FFmpegFileEncoder::_audio_stream_index = 1;
+
+static AVPixelFormat
+force_pixel_format (AVPixelFormat, AVPixelFormat out)
+{
+	return out;
+}
+
+FFmpegFileEncoder::FFmpegFileEncoder (
+	dcp::Size video_frame_size,
+	int video_frame_rate,
+	int audio_frame_rate,
+	int channels,
+	shared_ptr<Log> log,
+	ExportFormat format,
+	int x264_crf,
+	boost::filesystem::path output
+	)
+	: _video_options (0)
+	, _audio_channels (channels)
+	, _output (output)
+	, _video_frame_size (video_frame_size)
+	, _video_frame_rate (video_frame_rate)
+	, _audio_frame_rate (audio_frame_rate)
+	, _log (log)
+{
+	switch (format) {
+	case EXPORT_FORMAT_PRORES:
+		_pixel_format = AV_PIX_FMT_YUV422P10;
+		_sample_format = AV_SAMPLE_FMT_S16;
+		_video_codec_name = "prores_ks";
+		_audio_codec_name = "pcm_s16le";
+		av_dict_set (&_video_options, "profile", "3", 0);
+		av_dict_set (&_video_options, "threads", "auto", 0);
+		break;
+	case EXPORT_FORMAT_H264:
+		_pixel_format = AV_PIX_FMT_YUV420P;
+		_sample_format = AV_SAMPLE_FMT_FLTP;
+		_video_codec_name = "libx264";
+		_audio_codec_name = "aac";
+		av_dict_set_int (&_video_options, "crf", x264_crf, 0);
+		break;
+	}
+
+	setup_video ();
+	setup_audio ();
+
+	avformat_alloc_output_context2 (&_format_context, 0, 0, _output.string().c_str());
+	if (!_format_context) {
+		throw runtime_error ("could not allocate FFmpeg format context");
+	}
+
+	_video_stream = avformat_new_stream (_format_context, _video_codec);
+	if (!_video_stream) {
+		throw runtime_error ("could not create FFmpeg output video stream");
+	}
+
+	_audio_stream = avformat_new_stream (_format_context, _audio_codec);
+	if (!_audio_stream) {
+		throw runtime_error ("could not create FFmpeg output audio stream");
+	}
+
+	_video_stream->id = _video_stream_index;
+	_video_stream->codec = _video_codec_context;
+
+	_audio_stream->id = _audio_stream_index;
+	_audio_stream->codec = _audio_codec_context;
+
+	if (avcodec_open2 (_video_codec_context, _video_codec, &_video_options) < 0) {
+		throw runtime_error ("could not open FFmpeg video codec");
+	}
+
+	int r = avcodec_open2 (_audio_codec_context, _audio_codec, 0);
+	if (r < 0) {
+		char buffer[256];
+		av_strerror (r, buffer, sizeof(buffer));
+		throw runtime_error (String::compose ("could not open FFmpeg audio codec (%1)", buffer));
+	}
+
+	if (avio_open_boost (&_format_context->pb, _output, AVIO_FLAG_WRITE) < 0) {
+		throw runtime_error ("could not open FFmpeg output file");
+	}
+
+	if (avformat_write_header (_format_context, 0) < 0) {
+		throw runtime_error ("could not write header to FFmpeg output file");
+	}
+
+	_pending_audio.reset (new AudioBuffers(channels, 0));
+}
+
+void
+FFmpegFileEncoder::setup_video ()
+{
+	_video_codec = avcodec_find_encoder_by_name (_video_codec_name.c_str());
+	if (!_video_codec) {
+		throw runtime_error (String::compose ("could not find FFmpeg encoder %1", _video_codec_name));
+	}
+
+	_video_codec_context = avcodec_alloc_context3 (_video_codec);
+	if (!_video_codec_context) {
+		throw runtime_error ("could not allocate FFmpeg video context");
+	}
+
+	avcodec_get_context_defaults3 (_video_codec_context, _video_codec);
+
+	/* Variable quantisation */
+	_video_codec_context->global_quality = 0;
+	_video_codec_context->width = _video_frame_size.width;
+	_video_codec_context->height = _video_frame_size.height;
+	_video_codec_context->time_base = (AVRational) { 1, _video_frame_rate };
+	_video_codec_context->pix_fmt = _pixel_format;
+	_video_codec_context->flags |= AV_CODEC_FLAG_QSCALE | AV_CODEC_FLAG_GLOBAL_HEADER;
+}
+
+void
+FFmpegFileEncoder::setup_audio ()
+{
+	_audio_codec = avcodec_find_encoder_by_name (_audio_codec_name.c_str());
+	if (!_audio_codec) {
+		throw runtime_error (String::compose ("could not find FFmpeg encoder %1", _audio_codec_name));
+	}
+
+	_audio_codec_context = avcodec_alloc_context3 (_audio_codec);
+	if (!_audio_codec_context) {
+		throw runtime_error ("could not allocate FFmpeg audio context");
+	}
+
+	avcodec_get_context_defaults3 (_audio_codec_context, _audio_codec);
+
+	/* XXX: configurable */
+	_audio_codec_context->bit_rate = 256 * 1024;
+	_audio_codec_context->sample_fmt = _sample_format;
+	_audio_codec_context->sample_rate = _audio_frame_rate;
+	_audio_codec_context->channel_layout = av_get_default_channel_layout (_audio_channels);
+	_audio_codec_context->channels = _audio_channels;
+}
+
+void
+FFmpegFileEncoder::flush ()
+{
+	if (_pending_audio->frames() > 0) {
+		audio_frame (_pending_audio->frames ());
+	}
+
+	bool flushed_video = false;
+	bool flushed_audio = false;
+
+	while (!flushed_video || !flushed_audio) {
+		AVPacket packet;
+		av_init_packet (&packet);
+		packet.data = 0;
+		packet.size = 0;
+
+		int got_packet;
+		avcodec_encode_video2 (_video_codec_context, &packet, 0, &got_packet);
+		if (got_packet) {
+			packet.stream_index = 0;
+			av_interleaved_write_frame (_format_context, &packet);
+		} else {
+			flushed_video = true;
+		}
+		av_packet_unref (&packet);
+
+		av_init_packet (&packet);
+		packet.data = 0;
+		packet.size = 0;
+
+		avcodec_encode_audio2 (_audio_codec_context, &packet, 0, &got_packet);
+		if (got_packet) {
+			packet.stream_index = 0;
+			av_interleaved_write_frame (_format_context, &packet);
+		} else {
+			flushed_audio = true;
+		}
+		av_packet_unref (&packet);
+	}
+
+	av_write_trailer (_format_context);
+
+	avcodec_close (_video_codec_context);
+	avcodec_close (_audio_codec_context);
+	avio_close (_format_context->pb);
+	avformat_free_context (_format_context);
+}
+
+void
+FFmpegFileEncoder::video (shared_ptr<PlayerVideo> video, DCPTime time)
+{
+	shared_ptr<Image> image = video->image (
+		bind (&Log::dcp_log, _log.get(), _1, _2),
+		bind (&force_pixel_format, _1, _pixel_format),
+		true,
+		false
+		);
+
+	AVFrame* frame = av_frame_alloc ();
+	DCPOMATIC_ASSERT (frame);
+
+	_pending_images[image->data()[0]] = image;
+	for (int i = 0; i < 3; ++i) {
+		AVBufferRef* buffer = av_buffer_create(image->data()[i], image->stride()[i] * image->size().height, &buffer_free, this, 0);
+		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.seconds() / 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 (_video_codec_context, &packet, frame, &got_packet) < 0) {
+		throw EncodeError ("FFmpeg video encode failed");
+	}
+
+	if (got_packet && packet.size) {
+		packet.stream_index = _video_stream_index;
+		av_interleaved_write_frame (_format_context, &packet);
+		av_packet_unref (&packet);
+	}
+
+	av_frame_free (&frame);
+
+}
+
+/** Called when the player gives us some audio */
+void
+FFmpegFileEncoder::audio (shared_ptr<AudioBuffers> audio)
+{
+	_pending_audio->append (audio);
+
+	int frame_size = _audio_codec_context->frame_size;
+	if (frame_size == 0) {
+		/* codec has AV_CODEC_CAP_VARIABLE_FRAME_SIZE */
+		frame_size = _audio_frame_rate / _video_frame_rate;
+	}
+
+	while (_pending_audio->frames() >= frame_size) {
+		audio_frame (frame_size);
+	}
+}
+
+void
+FFmpegFileEncoder::audio_frame (int size)
+{
+	DCPOMATIC_ASSERT (size);
+
+	AVFrame* frame = av_frame_alloc ();
+	DCPOMATIC_ASSERT (frame);
+
+	int const channels = _pending_audio->channels();
+	DCPOMATIC_ASSERT (channels);
+
+	int const buffer_size = av_samples_get_buffer_size (0, channels, size, _audio_codec_context->sample_fmt, 0);
+	DCPOMATIC_ASSERT (buffer_size >= 0);
+
+	void* samples = av_malloc (buffer_size);
+	DCPOMATIC_ASSERT (samples);
+
+	frame->nb_samples = size;
+	int r = avcodec_fill_audio_frame (frame, channels, _audio_codec_context->sample_fmt, (const uint8_t *) samples, buffer_size, 0);
+	DCPOMATIC_ASSERT (r >= 0);
+
+	float** p = _pending_audio->data ();
+	switch (_audio_codec_context->sample_fmt) {
+	case AV_SAMPLE_FMT_S16:
+	{
+		int16_t* q = reinterpret_cast<int16_t*> (samples);
+		for (int i = 0; i < size; ++i) {
+			for (int j = 0; j < channels; ++j) {
+				*q++ = p[j][i] * 32767;
+			}
+		}
+		break;
+	}
+	case AV_SAMPLE_FMT_FLTP:
+	{
+		float* q = reinterpret_cast<float*> (samples);
+		for (int i = 0; i < channels; ++i) {
+			memcpy (q, p[i], sizeof(float) * size);
+			q += size;
+		}
+		break;
+	}
+	default:
+		DCPOMATIC_ASSERT (false);
+	}
+
+	AVPacket packet;
+	av_init_packet (&packet);
+	packet.data = 0;
+	packet.size = 0;
+
+	int got_packet;
+	if (avcodec_encode_audio2 (_audio_codec_context, &packet, frame, &got_packet) < 0) {
+		throw EncodeError ("FFmpeg audio encode failed");
+	}
+
+	if (got_packet && packet.size) {
+		packet.stream_index = _audio_stream_index;
+		av_interleaved_write_frame (_format_context, &packet);
+		av_packet_unref (&packet);
+	}
+
+	av_free (samples);
+	av_frame_free (&frame);
+
+	_pending_audio->trim_start (size);
+}
+
+void
+FFmpegFileEncoder::subtitle (PlayerText, DCPTimePeriod)
+{
+
+}
+
+void
+FFmpegFileEncoder::buffer_free (void* opaque, uint8_t* data)
+{
+	reinterpret_cast<FFmpegFileEncoder*>(opaque)->buffer_free2(data);
+}
+
+void
+FFmpegFileEncoder::buffer_free2 (uint8_t* data)
+{
+	_pending_images.erase (data);
+}