2 Copyright (C) 2017-2021 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/>.
22 #include "ffmpeg_encoder.h"
23 #include "ffmpeg_wrapper.h"
27 #include "player_video.h"
31 #include "compose.hpp"
33 #include <libavutil/channel_layout.h>
41 using std::make_shared;
43 using std::runtime_error;
44 using std::shared_ptr;
48 using boost::optional;
49 using namespace dcpomatic;
50 #if BOOST_VERSION >= 106100
51 using namespace boost::placeholders;
55 int FFmpegFileEncoder::_video_stream_index = 0;
56 int FFmpegFileEncoder::_audio_stream_index_base = 1;
59 class ExportAudioStream
62 ExportAudioStream (string codec_name, int channels, int frame_rate, AVSampleFormat sample_format, AVFormatContext* format_context, int stream_index)
63 : _format_context (format_context)
64 , _stream_index (stream_index)
66 _codec = avcodec_find_encoder_by_name (codec_name.c_str());
68 throw EncodeError (String::compose("avcodec_find_encoder_by_name failed for %1", codec_name));
71 _codec_context = avcodec_alloc_context3 (_codec);
72 if (!_codec_context) {
73 throw std::bad_alloc ();
76 /* XXX: configurable */
77 _codec_context->bit_rate = channels * 128 * 1024;
78 _codec_context->sample_fmt = sample_format;
79 _codec_context->sample_rate = frame_rate;
80 _codec_context->channel_layout = av_get_default_channel_layout (channels);
81 _codec_context->channels = channels;
83 int r = avcodec_open2 (_codec_context, _codec, 0);
85 throw EncodeError (N_("avcodec_open2"), N_("ExportAudioStream::ExportAudioStream"), r);
88 _stream = avformat_new_stream (format_context, _codec);
90 throw EncodeError (N_("avformat_new_stream"), N_("ExportAudioStream::ExportAudioStream"));
93 _stream->id = stream_index;
94 _stream->disposition |= AV_DISPOSITION_DEFAULT;
95 r = avcodec_parameters_from_context (_stream->codecpar, _codec_context);
97 throw EncodeError (N_("avcodec_parameters_from_context"), N_("ExportAudioStream::ExportAudioStream"), r);
101 ~ExportAudioStream ()
103 avcodec_close (_codec_context);
106 ExportAudioStream (ExportAudioStream const&) = delete;
107 ExportAudioStream& operator= (ExportAudioStream const&) = delete;
109 int frame_size () const {
110 return _codec_context->frame_size;
115 int r = avcodec_send_frame (_codec_context, nullptr);
116 if (r < 0 && r != AVERROR_EOF) {
117 /* We get EOF if we've already flushed the stream once */
118 throw EncodeError (N_("avcodec_send_frame"), N_("ExportAudioStream::flush"), r);
121 ffmpeg::Packet packet;
122 r = avcodec_receive_packet (_codec_context, packet.get());
123 if (r == AVERROR_EOF) {
126 throw EncodeError (N_("avcodec_receive_packet"), N_("ExportAudioStream::flush"), r);
129 packet->stream_index = _stream_index;
130 av_interleaved_write_frame (_format_context, packet.get());
134 void write (int size, int channel_offset, int channels, float** data, int64_t sample_offset)
136 DCPOMATIC_ASSERT (size);
138 auto frame = av_frame_alloc ();
139 DCPOMATIC_ASSERT (frame);
141 int const buffer_size = av_samples_get_buffer_size (0, channels, size, _codec_context->sample_fmt, 0);
142 DCPOMATIC_ASSERT (buffer_size >= 0);
144 auto samples = av_malloc (buffer_size);
145 DCPOMATIC_ASSERT (samples);
147 frame->nb_samples = size;
148 frame->format = _codec_context->sample_fmt;
149 frame->channels = channels;
150 int r = avcodec_fill_audio_frame (frame, channels, _codec_context->sample_fmt, (const uint8_t *) samples, buffer_size, 0);
151 DCPOMATIC_ASSERT (r >= 0);
153 switch (_codec_context->sample_fmt) {
154 case AV_SAMPLE_FMT_S16:
156 int16_t* q = reinterpret_cast<int16_t*> (samples);
157 for (int i = 0; i < size; ++i) {
158 for (int j = 0; j < channels; ++j) {
159 *q++ = data[j + channel_offset][i] * 32767;
164 case AV_SAMPLE_FMT_S32:
166 int32_t* q = reinterpret_cast<int32_t*> (samples);
167 for (int i = 0; i < size; ++i) {
168 for (int j = 0; j < channels; ++j) {
169 *q++ = data[j + channel_offset][i] * 2147483647;
174 case AV_SAMPLE_FMT_FLTP:
176 float* q = reinterpret_cast<float*> (samples);
177 for (int i = 0; i < channels; ++i) {
178 memcpy (q, data[i + channel_offset], sizeof(float) * size);
184 DCPOMATIC_ASSERT (false);
187 DCPOMATIC_ASSERT (_codec_context->time_base.num == 1);
188 frame->pts = sample_offset * _codec_context->time_base.den / _codec_context->sample_rate;
190 r = avcodec_send_frame (_codec_context, frame);
192 av_frame_free (&frame);
194 throw EncodeError (N_("avcodec_send_frame"), N_("ExportAudioStream::write"), r);
197 ffmpeg::Packet packet;
198 r = avcodec_receive_packet (_codec_context, packet.get());
199 if (r < 0 && r != AVERROR(EAGAIN)) {
200 throw EncodeError (N_("avcodec_receive_packet"), N_("ExportAudioStream::write"), r);
202 packet->stream_index = _stream_index;
203 av_interleaved_write_frame (_format_context, packet.get());
208 AVFormatContext* _format_context;
209 AVCodec const * _codec;
210 AVCodecContext* _codec_context;
216 FFmpegFileEncoder::FFmpegFileEncoder (
217 dcp::Size video_frame_size,
218 int video_frame_rate,
219 int audio_frame_rate,
222 bool audio_stream_per_channel,
224 boost::filesystem::path output
226 : _audio_stream_per_channel (audio_stream_per_channel)
227 , _audio_channels (channels)
229 , _video_frame_size (video_frame_size)
230 , _video_frame_rate (video_frame_rate)
231 , _audio_frame_rate (audio_frame_rate)
233 _pixel_format = pixel_format (format);
236 case ExportFormat::PRORES:
237 _sample_format = AV_SAMPLE_FMT_S16;
238 _video_codec_name = "prores_ks";
239 _audio_codec_name = "pcm_s16le";
240 av_dict_set (&_video_options, "profile", "3", 0);
241 av_dict_set (&_video_options, "threads", "auto", 0);
243 case ExportFormat::H264_AAC:
244 _sample_format = AV_SAMPLE_FMT_FLTP;
245 _video_codec_name = "libx264";
246 _audio_codec_name = "aac";
247 av_dict_set_int (&_video_options, "crf", x264_crf, 0);
249 case ExportFormat::H264_PCM:
250 _sample_format = AV_SAMPLE_FMT_S32;
251 _video_codec_name = "libx264";
252 _audio_codec_name = "pcm_s24le";
253 av_dict_set_int (&_video_options, "crf", x264_crf, 0);
256 DCPOMATIC_ASSERT (false);
259 int r = avformat_alloc_output_context2 (&_format_context, 0, 0, _output.string().c_str());
260 if (!_format_context) {
261 throw EncodeError (N_("avformat_alloc_output_context2"), "FFmpegFileEncoder::FFmpegFileEncoder", r);
267 r = avio_open_boost (&_format_context->pb, _output, AVIO_FLAG_WRITE);
269 throw EncodeError (String::compose(_("Could not open output file %1 (%2)"), _output.string(), r));
272 AVDictionary* options = nullptr;
274 r = avformat_write_header (_format_context, &options);
276 throw EncodeError (N_("avformat_write_header"), N_("FFmpegFileEncoder::FFmpegFileEncoder"), r);
279 _pending_audio.reset (new AudioBuffers(channels, 0));
283 FFmpegFileEncoder::~FFmpegFileEncoder ()
285 _audio_streams.clear ();
286 avcodec_close (_video_codec_context);
287 avformat_free_context (_format_context);
292 FFmpegFileEncoder::pixel_format (ExportFormat format)
295 case ExportFormat::PRORES:
296 return AV_PIX_FMT_YUV422P10;
297 case ExportFormat::H264_AAC:
298 case ExportFormat::H264_PCM:
299 return AV_PIX_FMT_YUV420P;
301 DCPOMATIC_ASSERT (false);
304 return AV_PIX_FMT_YUV422P10;
309 FFmpegFileEncoder::setup_video ()
311 _video_codec = avcodec_find_encoder_by_name (_video_codec_name.c_str());
313 throw EncodeError (String::compose("avcodec_find_encoder_by_name failed for %1", _video_codec_name));
316 _video_codec_context = avcodec_alloc_context3 (_video_codec);
317 if (!_video_codec_context) {
318 throw std::bad_alloc ();
321 /* Variable quantisation */
322 _video_codec_context->global_quality = 0;
323 _video_codec_context->width = _video_frame_size.width;
324 _video_codec_context->height = _video_frame_size.height;
325 _video_codec_context->time_base = (AVRational) { 1, _video_frame_rate };
326 _video_codec_context->pix_fmt = _pixel_format;
327 _video_codec_context->flags |= AV_CODEC_FLAG_QSCALE | AV_CODEC_FLAG_GLOBAL_HEADER;
329 if (avcodec_open2 (_video_codec_context, _video_codec, &_video_options) < 0) {
330 throw EncodeError (N_("avcodec_open"), N_("FFmpegFileEncoder::setup_video"));
333 _video_stream = avformat_new_stream (_format_context, _video_codec);
334 if (!_video_stream) {
335 throw EncodeError (N_("avformat_new_stream"), N_("FFmpegFileEncoder::setup_video"));
338 _video_stream->id = _video_stream_index;
339 int r = avcodec_parameters_from_context (_video_stream->codecpar, _video_codec_context);
341 throw EncodeError (N_("avcodec_parameters_from_context"), N_("FFmpegFileEncoder::setup_video"), r);
347 FFmpegFileEncoder::setup_audio ()
349 int const streams = _audio_stream_per_channel ? _audio_channels : 1;
350 int const channels_per_stream = _audio_stream_per_channel ? 1 : _audio_channels;
352 for (int i = 0; i < streams; ++i) {
353 _audio_streams.push_back(
354 make_shared<ExportAudioStream>(
355 _audio_codec_name, channels_per_stream, _audio_frame_rate, _sample_format, _format_context, _audio_stream_index_base + i
363 FFmpegFileEncoder::flush ()
365 if (_pending_audio->frames() > 0) {
366 audio_frame (_pending_audio->frames ());
369 bool flushed_video = false;
370 bool flushed_audio = false;
372 while (!flushed_video || !flushed_audio) {
373 int r = avcodec_send_frame (_video_codec_context, nullptr);
374 if (r < 0 && r != AVERROR_EOF) {
375 /* We get EOF if we've already flushed the stream once */
376 throw EncodeError (N_("avcodec_send_frame"), N_("FFmpegFileEncoder::flush"), r);
379 ffmpeg::Packet packet;
380 r = avcodec_receive_packet (_video_codec_context, packet.get());
381 if (r == AVERROR_EOF) {
382 flushed_video = true;
384 throw EncodeError (N_("avcodec_receive_packet"), N_("FFmpegFileEncoder::flush"), r);
386 packet->stream_index = _video_stream_index;
387 av_interleaved_write_frame (_format_context, packet.get());
390 flushed_audio = true;
391 for (auto i: _audio_streams) {
393 flushed_audio = false;
398 av_write_trailer (_format_context);
403 FFmpegFileEncoder::video (shared_ptr<PlayerVideo> video, DCPTime time)
405 /* All our output formats are video range at the moment */
406 auto image = video->image (
407 bind (&PlayerVideo::force, _1, _pixel_format),
413 auto frame = av_frame_alloc ();
414 DCPOMATIC_ASSERT (frame);
417 boost::mutex::scoped_lock lm (_pending_images_mutex);
418 _pending_images[image->data()[0]] = image;
421 for (int i = 0; i < 3; ++i) {
422 auto buffer = av_buffer_create(image->data()[i], image->stride()[i] * image->size().height, &buffer_free, this, 0);
423 frame->buf[i] = av_buffer_ref (buffer);
424 frame->data[i] = buffer->data;
425 frame->linesize[i] = image->stride()[i];
426 av_buffer_unref (&buffer);
429 frame->width = image->size().width;
430 frame->height = image->size().height;
431 frame->format = _pixel_format;
432 DCPOMATIC_ASSERT (_video_stream->time_base.num == 1);
433 frame->pts = time.get() * _video_stream->time_base.den / DCPTime::HZ;
435 int r = avcodec_send_frame (_video_codec_context, frame);
436 av_frame_free (&frame);
438 throw EncodeError (N_("avcodec_send_frame"), N_("FFmpegFileEncoder::video"), r);
441 ffmpeg::Packet packet;
442 r = avcodec_receive_packet (_video_codec_context, packet.get());
443 if (r < 0 && r != AVERROR(EAGAIN)) {
444 throw EncodeError (N_("avcodec_receive_packet"), N_("FFmpegFileEncoder::video"), r);
446 packet->stream_index = _video_stream_index;
447 av_interleaved_write_frame (_format_context, packet.get());
452 /** Called when the player gives us some audio */
454 FFmpegFileEncoder::audio (shared_ptr<AudioBuffers> audio)
456 _pending_audio->append (audio);
458 DCPOMATIC_ASSERT (!_audio_streams.empty());
459 int frame_size = _audio_streams[0]->frame_size();
460 if (frame_size == 0) {
461 /* codec has AV_CODEC_CAP_VARIABLE_FRAME_SIZE */
462 frame_size = _audio_frame_rate / _video_frame_rate;
465 while (_pending_audio->frames() >= frame_size) {
466 audio_frame (frame_size);
472 FFmpegFileEncoder::audio_frame (int size)
474 if (_audio_stream_per_channel) {
476 for (auto i: _audio_streams) {
477 i->write (size, offset, 1, _pending_audio->data(), _audio_frames);
481 DCPOMATIC_ASSERT (!_audio_streams.empty());
482 DCPOMATIC_ASSERT (_pending_audio->channels());
483 _audio_streams[0]->write (size, 0, _pending_audio->channels(), _pending_audio->data(), _audio_frames);
486 _pending_audio->trim_start (size);
487 _audio_frames += size;
492 FFmpegFileEncoder::subtitle (PlayerText, DCPTimePeriod)
499 FFmpegFileEncoder::buffer_free (void* opaque, uint8_t* data)
501 reinterpret_cast<FFmpegFileEncoder*>(opaque)->buffer_free2(data);
506 FFmpegFileEncoder::buffer_free2 (uint8_t* data)
508 boost::mutex::scoped_lock lm (_pending_images_mutex);
509 if (_pending_images.find(data) != _pending_images.end()) {
510 _pending_images.erase (data);