2 Copyright (C) 2017-2018 Carl Hetherington <cth@carlh.net>
4 This file is part of DCP-o-matic.
6 DCP-o-matic is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 DCP-o-matic is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with DCP-o-matic. If not, see <http://www.gnu.org/licenses/>.
21 #include "ffmpeg_encoder.h"
25 #include "player_video.h"
29 #include "compose.hpp"
35 using std::runtime_error;
38 using boost::shared_ptr;
40 using boost::weak_ptr;
41 using boost::optional;
42 using namespace dcpomatic;
44 int FFmpegFileEncoder::_video_stream_index = 0;
45 int FFmpegFileEncoder::_audio_stream_index_base = 1;
48 class ExportAudioStream : public boost::noncopyable
51 ExportAudioStream (string codec_name, int channels, int frame_rate, AVSampleFormat sample_format, AVFormatContext* format_context, int stream_index)
52 : _format_context (format_context)
53 , _stream_index (stream_index)
55 _codec = avcodec_find_encoder_by_name (codec_name.c_str());
57 throw runtime_error (String::compose("could not find FFmpeg encoder %1", codec_name));
60 _codec_context = avcodec_alloc_context3 (_codec);
61 if (!_codec_context) {
62 throw runtime_error ("could not allocate FFmpeg audio context");
65 avcodec_get_context_defaults3 (_codec_context, _codec);
67 /* XXX: configurable */
68 _codec_context->bit_rate = channels * 128 * 1024;
69 _codec_context->sample_fmt = sample_format;
70 _codec_context->sample_rate = frame_rate;
71 _codec_context->channel_layout = av_get_default_channel_layout (channels);
72 _codec_context->channels = channels;
74 _stream = avformat_new_stream (format_context, _codec);
76 throw runtime_error ("could not create FFmpeg output audio stream");
79 _stream->id = stream_index;
80 DCPOMATIC_DISABLE_WARNINGS
81 _stream->codec = _codec_context;
82 DCPOMATIC_ENABLE_WARNINGS
84 int r = avcodec_open2 (_codec_context, _codec, 0);
87 av_strerror (r, buffer, sizeof(buffer));
88 throw runtime_error (String::compose("could not open FFmpeg audio codec (%1)", buffer));
94 avcodec_close (_codec_context);
97 int frame_size () const {
98 return _codec_context->frame_size;
104 av_init_packet (&packet);
107 bool flushed = false;
110 DCPOMATIC_DISABLE_WARNINGS
111 avcodec_encode_audio2 (_codec_context, &packet, 0, &got_packet);
112 DCPOMATIC_ENABLE_WARNINGS
114 packet.stream_index = 0;
115 av_interleaved_write_frame (_format_context, &packet);
119 av_packet_unref (&packet);
123 void write (int size, int channel_offset, int channels, float** data, int64_t sample_offset)
125 DCPOMATIC_ASSERT (size);
127 AVFrame* frame = av_frame_alloc ();
128 DCPOMATIC_ASSERT (frame);
130 int const buffer_size = av_samples_get_buffer_size (0, channels, size, _codec_context->sample_fmt, 0);
131 DCPOMATIC_ASSERT (buffer_size >= 0);
133 void* samples = av_malloc (buffer_size);
134 DCPOMATIC_ASSERT (samples);
136 frame->nb_samples = size;
137 int r = avcodec_fill_audio_frame (frame, channels, _codec_context->sample_fmt, (const uint8_t *) samples, buffer_size, 0);
138 DCPOMATIC_ASSERT (r >= 0);
140 switch (_codec_context->sample_fmt) {
141 case AV_SAMPLE_FMT_S16:
143 int16_t* q = reinterpret_cast<int16_t*> (samples);
144 for (int i = 0; i < size; ++i) {
145 for (int j = 0; j < channels; ++j) {
146 *q++ = data[j + channel_offset][i] * 32767;
151 case AV_SAMPLE_FMT_S32:
153 int32_t* q = reinterpret_cast<int32_t*> (samples);
154 for (int i = 0; i < size; ++i) {
155 for (int j = 0; j < channels; ++j) {
156 *q++ = data[j + channel_offset][i] * 2147483647;
161 case AV_SAMPLE_FMT_FLTP:
163 float* q = reinterpret_cast<float*> (samples);
164 for (int i = 0; i < channels; ++i) {
165 memcpy (q, data[i + channel_offset], sizeof(float) * size);
171 DCPOMATIC_ASSERT (false);
174 DCPOMATIC_ASSERT (_codec_context->time_base.num == 1);
175 frame->pts = sample_offset * _codec_context->time_base.den / _codec_context->sample_rate;
178 av_init_packet (&packet);
183 DCPOMATIC_DISABLE_WARNINGS
184 if (avcodec_encode_audio2 (_codec_context, &packet, frame, &got_packet) < 0) {
185 throw EncodeError ("FFmpeg audio encode failed");
187 DCPOMATIC_ENABLE_WARNINGS
189 if (got_packet && packet.size) {
190 packet.stream_index = _stream_index;
191 av_interleaved_write_frame (_format_context, &packet);
192 av_packet_unref (&packet);
196 av_frame_free (&frame);
200 AVFormatContext* _format_context;
202 AVCodecContext* _codec_context;
208 FFmpegFileEncoder::FFmpegFileEncoder (
209 dcp::Size video_frame_size,
210 int video_frame_rate,
211 int audio_frame_rate,
214 bool audio_stream_per_channel,
216 boost::filesystem::path output
217 #ifdef DCPOMATIC_VARIANT_SWAROOP
218 , optional<dcp::Key> key
219 , optional<string> id
222 : _audio_stream_per_channel (audio_stream_per_channel)
224 , _audio_channels (channels)
226 , _video_frame_size (video_frame_size)
227 , _video_frame_rate (video_frame_rate)
228 , _audio_frame_rate (audio_frame_rate)
231 _pixel_format = pixel_format (format);
234 case EXPORT_FORMAT_PRORES:
235 _sample_format = AV_SAMPLE_FMT_S16;
236 _video_codec_name = "prores_ks";
237 _audio_codec_name = "pcm_s16le";
238 av_dict_set (&_video_options, "profile", "3", 0);
239 av_dict_set (&_video_options, "threads", "auto", 0);
241 case EXPORT_FORMAT_H264_AAC:
242 _sample_format = AV_SAMPLE_FMT_FLTP;
243 _video_codec_name = "libx264";
244 _audio_codec_name = "aac";
245 av_dict_set_int (&_video_options, "crf", x264_crf, 0);
247 case EXPORT_FORMAT_H264_PCM:
248 _sample_format = AV_SAMPLE_FMT_S32;
249 _video_codec_name = "libx264";
250 _audio_codec_name = "pcm_s24le";
251 av_dict_set_int (&_video_options, "crf", x264_crf, 0);
254 DCPOMATIC_ASSERT (false);
257 #ifdef DCPOMATIC_VARIANT_SWAROOP
258 int r = avformat_alloc_output_context2 (&_format_context, av_guess_format("mov", 0, 0), 0, 0);
260 int r = avformat_alloc_output_context2 (&_format_context, 0, 0, _output.string().c_str());
262 if (!_format_context) {
263 throw runtime_error (String::compose("could not allocate FFmpeg format context (%1)", r));
269 r = avio_open_boost (&_format_context->pb, _output, AVIO_FLAG_WRITE);
271 throw runtime_error (String::compose("could not open FFmpeg output file %1 (%2)", _output.string(), r));
274 AVDictionary* options = 0;
276 #ifdef DCPOMATIC_VARIANT_SWAROOP
278 av_dict_set (&options, "encryption_key", key->hex().c_str(), 0);
279 /* XXX: is this OK? */
280 av_dict_set (&options, "encryption_kid", "00000000000000000000000000000000", 0);
281 av_dict_set (&options, "encryption_scheme", "cenc-aes-ctr", 0);
285 if (av_dict_set(&_format_context->metadata, SWAROOP_ID_TAG, id->c_str(), 0) < 0) {
286 throw runtime_error ("Could not write ID to output");
291 if (avformat_write_header (_format_context, &options) < 0) {
292 throw runtime_error ("could not write header to FFmpeg output file");
295 _pending_audio.reset (new AudioBuffers(channels, 0));
299 FFmpegFileEncoder::~FFmpegFileEncoder ()
301 _audio_streams.clear ();
302 avcodec_close (_video_codec_context);
303 avformat_free_context (_format_context);
308 FFmpegFileEncoder::pixel_format (ExportFormat format)
311 case EXPORT_FORMAT_PRORES:
312 return AV_PIX_FMT_YUV422P10;
313 case EXPORT_FORMAT_H264_AAC:
314 case EXPORT_FORMAT_H264_PCM:
315 return AV_PIX_FMT_YUV420P;
317 DCPOMATIC_ASSERT (false);
320 return AV_PIX_FMT_YUV422P10;
324 FFmpegFileEncoder::setup_video ()
326 _video_codec = avcodec_find_encoder_by_name (_video_codec_name.c_str());
328 throw runtime_error (String::compose ("could not find FFmpeg encoder %1", _video_codec_name));
331 _video_codec_context = avcodec_alloc_context3 (_video_codec);
332 if (!_video_codec_context) {
333 throw runtime_error ("could not allocate FFmpeg video context");
336 avcodec_get_context_defaults3 (_video_codec_context, _video_codec);
338 /* Variable quantisation */
339 _video_codec_context->global_quality = 0;
340 _video_codec_context->width = _video_frame_size.width;
341 _video_codec_context->height = _video_frame_size.height;
342 _video_codec_context->time_base = (AVRational) { 1, _video_frame_rate };
343 _video_codec_context->pix_fmt = _pixel_format;
344 _video_codec_context->flags |= AV_CODEC_FLAG_QSCALE | AV_CODEC_FLAG_GLOBAL_HEADER;
346 _video_stream = avformat_new_stream (_format_context, _video_codec);
347 if (!_video_stream) {
348 throw runtime_error ("could not create FFmpeg output video stream");
351 DCPOMATIC_DISABLE_WARNINGS
352 _video_stream->id = _video_stream_index;
353 _video_stream->codec = _video_codec_context;
354 DCPOMATIC_ENABLE_WARNINGS
356 if (avcodec_open2 (_video_codec_context, _video_codec, &_video_options) < 0) {
357 throw runtime_error ("could not open FFmpeg video codec");
363 FFmpegFileEncoder::setup_audio ()
365 int const streams = _audio_stream_per_channel ? _audio_channels : 1;
366 int const channels_per_stream = _audio_stream_per_channel ? 1 : _audio_channels;
368 for (int i = 0; i < streams; ++i) {
369 _audio_streams.push_back(
370 shared_ptr<ExportAudioStream>(
371 new ExportAudioStream(_audio_codec_name, channels_per_stream, _audio_frame_rate, _sample_format, _format_context, _audio_stream_index_base + i)
379 FFmpegFileEncoder::flush ()
381 if (_pending_audio->frames() > 0) {
382 audio_frame (_pending_audio->frames ());
385 bool flushed_video = false;
386 bool flushed_audio = false;
388 while (!flushed_video || !flushed_audio) {
390 av_init_packet (&packet);
395 DCPOMATIC_DISABLE_WARNINGS
396 avcodec_encode_video2 (_video_codec_context, &packet, 0, &got_packet);
397 DCPOMATIC_ENABLE_WARNINGS
399 packet.stream_index = 0;
400 av_interleaved_write_frame (_format_context, &packet);
402 flushed_video = true;
404 av_packet_unref (&packet);
406 flushed_audio = true;
407 BOOST_FOREACH (shared_ptr<ExportAudioStream> i, _audio_streams) {
409 flushed_audio = false;
414 av_write_trailer (_format_context);
418 FFmpegFileEncoder::video (shared_ptr<PlayerVideo> video, DCPTime time)
420 shared_ptr<Image> image = video->image (
421 bind (&PlayerVideo::force, _1, _pixel_format),
426 AVFrame* frame = av_frame_alloc ();
427 DCPOMATIC_ASSERT (frame);
430 boost::mutex::scoped_lock lm (_pending_images_mutex);
431 _pending_images[image->data()[0]] = image;
434 for (int i = 0; i < 3; ++i) {
435 AVBufferRef* buffer = av_buffer_create(image->data()[i], image->stride()[i] * image->size().height, &buffer_free, this, 0);
436 frame->buf[i] = av_buffer_ref (buffer);
437 frame->data[i] = buffer->data;
438 frame->linesize[i] = image->stride()[i];
439 av_buffer_unref (&buffer);
442 frame->width = image->size().width;
443 frame->height = image->size().height;
444 frame->format = _pixel_format;
445 DCPOMATIC_ASSERT (_video_stream->time_base.num == 1);
446 frame->pts = time.get() * _video_stream->time_base.den / DCPTime::HZ;
449 av_init_packet (&packet);
454 DCPOMATIC_DISABLE_WARNINGS
455 if (avcodec_encode_video2 (_video_codec_context, &packet, frame, &got_packet) < 0) {
456 throw EncodeError ("FFmpeg video encode failed");
458 DCPOMATIC_ENABLE_WARNINGS
460 if (got_packet && packet.size) {
461 packet.stream_index = _video_stream_index;
462 av_interleaved_write_frame (_format_context, &packet);
463 av_packet_unref (&packet);
466 av_frame_free (&frame);
470 /** Called when the player gives us some audio */
472 FFmpegFileEncoder::audio (shared_ptr<AudioBuffers> audio)
474 _pending_audio->append (audio);
476 DCPOMATIC_ASSERT (!_audio_streams.empty());
477 int frame_size = _audio_streams[0]->frame_size();
478 if (frame_size == 0) {
479 /* codec has AV_CODEC_CAP_VARIABLE_FRAME_SIZE */
480 frame_size = _audio_frame_rate / _video_frame_rate;
483 while (_pending_audio->frames() >= frame_size) {
484 audio_frame (frame_size);
489 FFmpegFileEncoder::audio_frame (int size)
491 if (_audio_stream_per_channel) {
493 BOOST_FOREACH (shared_ptr<ExportAudioStream> i, _audio_streams) {
494 i->write (size, offset, 1, _pending_audio->data(), _audio_frames);
498 DCPOMATIC_ASSERT (!_audio_streams.empty());
499 DCPOMATIC_ASSERT (_pending_audio->channels());
500 _audio_streams[0]->write (size, 0, _pending_audio->channels(), _pending_audio->data(), _audio_frames);
503 _pending_audio->trim_start (size);
504 _audio_frames += size;
508 FFmpegFileEncoder::subtitle (PlayerText, DCPTimePeriod)
514 FFmpegFileEncoder::buffer_free (void* opaque, uint8_t* data)
516 reinterpret_cast<FFmpegFileEncoder*>(opaque)->buffer_free2(data);
520 FFmpegFileEncoder::buffer_free2 (uint8_t* data)
522 boost::mutex::scoped_lock lm (_pending_images_mutex);
523 if (_pending_images.find(data) != _pending_images.end()) {
524 _pending_images.erase (data);