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 "compose.hpp"
24 #include "ffmpeg_encoder.h"
25 #include "ffmpeg_wrapper.h"
31 #include "player_video.h"
33 #include <libavutil/channel_layout.h>
41 using std::make_shared;
42 using std::shared_ptr;
45 using namespace dcpomatic;
46 #if BOOST_VERSION >= 106100
47 using namespace boost::placeholders;
51 int FFmpegFileEncoder::_video_stream_index = 0;
52 int FFmpegFileEncoder::_audio_stream_index_base = 1;
55 class ExportAudioStream
58 ExportAudioStream (string codec_name, int channels, int frame_rate, AVSampleFormat sample_format, AVFormatContext* format_context, int stream_index)
59 : _format_context (format_context)
60 , _stream_index (stream_index)
62 _codec = avcodec_find_encoder_by_name (codec_name.c_str());
64 throw EncodeError (String::compose("avcodec_find_encoder_by_name failed for %1", codec_name));
67 _codec_context = avcodec_alloc_context3 (_codec);
68 if (!_codec_context) {
69 throw std::bad_alloc ();
72 /* XXX: configurable */
73 _codec_context->bit_rate = channels * 128 * 1024;
74 _codec_context->sample_fmt = sample_format;
75 _codec_context->sample_rate = frame_rate;
76 _codec_context->channel_layout = av_get_default_channel_layout (channels);
77 _codec_context->channels = channels;
79 int r = avcodec_open2 (_codec_context, _codec, 0);
81 throw EncodeError (N_("avcodec_open2"), N_("ExportAudioStream::ExportAudioStream"), r);
84 _stream = avformat_new_stream (format_context, _codec);
86 throw EncodeError (N_("avformat_new_stream"), N_("ExportAudioStream::ExportAudioStream"));
89 _stream->id = stream_index;
90 _stream->disposition |= AV_DISPOSITION_DEFAULT;
91 r = avcodec_parameters_from_context (_stream->codecpar, _codec_context);
93 throw EncodeError (N_("avcodec_parameters_from_context"), N_("ExportAudioStream::ExportAudioStream"), r);
99 avcodec_close (_codec_context);
102 ExportAudioStream (ExportAudioStream const&) = delete;
103 ExportAudioStream& operator= (ExportAudioStream const&) = delete;
105 int frame_size () const {
106 return _codec_context->frame_size;
111 int r = avcodec_send_frame (_codec_context, nullptr);
112 if (r < 0 && r != AVERROR_EOF) {
113 /* We get EOF if we've already flushed the stream once */
114 throw EncodeError (N_("avcodec_send_frame"), N_("ExportAudioStream::flush"), r);
117 ffmpeg::Packet packet;
118 r = avcodec_receive_packet (_codec_context, packet.get());
119 if (r == AVERROR_EOF) {
122 throw EncodeError (N_("avcodec_receive_packet"), N_("ExportAudioStream::flush"), r);
125 packet->stream_index = _stream_index;
126 av_interleaved_write_frame (_format_context, packet.get());
130 void write (int size, int channel_offset, int channels, float* const* data, int64_t sample_offset)
132 DCPOMATIC_ASSERT (size);
134 auto frame = av_frame_alloc ();
135 DCPOMATIC_ASSERT (frame);
138 int const buffer_size = av_samples_get_buffer_size (&line_size, channels, size, _codec_context->sample_fmt, 0);
139 DCPOMATIC_ASSERT (buffer_size >= 0);
141 auto samples = av_malloc (buffer_size);
142 DCPOMATIC_ASSERT (samples);
144 frame->nb_samples = size;
145 frame->format = _codec_context->sample_fmt;
146 frame->channels = channels;
147 int r = avcodec_fill_audio_frame (frame, channels, _codec_context->sample_fmt, (const uint8_t *) samples, buffer_size, 0);
148 DCPOMATIC_ASSERT (r >= 0);
150 switch (_codec_context->sample_fmt) {
151 case AV_SAMPLE_FMT_S16:
153 int16_t* q = reinterpret_cast<int16_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] * 32767;
161 case AV_SAMPLE_FMT_S32:
163 int32_t* q = reinterpret_cast<int32_t*> (samples);
164 for (int i = 0; i < size; ++i) {
165 for (int j = 0; j < channels; ++j) {
166 *q++ = data[j + channel_offset][i] * 2147483647;
171 case AV_SAMPLE_FMT_FLTP:
173 for (int i = 0; i < channels; ++i) {
174 memcpy (reinterpret_cast<float*>(static_cast<uint8_t*>(samples) + i * line_size), data[i + channel_offset], sizeof(float) * size);
179 DCPOMATIC_ASSERT (false);
182 DCPOMATIC_ASSERT (_codec_context->time_base.num == 1);
183 frame->pts = sample_offset * _codec_context->time_base.den / _codec_context->sample_rate;
185 r = avcodec_send_frame (_codec_context, frame);
187 av_frame_free (&frame);
189 throw EncodeError (N_("avcodec_send_frame"), N_("ExportAudioStream::write"), r);
192 ffmpeg::Packet packet;
193 r = avcodec_receive_packet (_codec_context, packet.get());
194 if (r < 0 && r != AVERROR(EAGAIN)) {
195 throw EncodeError (N_("avcodec_receive_packet"), N_("ExportAudioStream::write"), r);
197 packet->stream_index = _stream_index;
198 av_interleaved_write_frame (_format_context, packet.get());
203 AVFormatContext* _format_context;
204 AVCodec const * _codec;
205 AVCodecContext* _codec_context;
211 FFmpegFileEncoder::FFmpegFileEncoder (
212 dcp::Size video_frame_size,
213 int video_frame_rate,
214 int audio_frame_rate,
217 bool audio_stream_per_channel,
219 boost::filesystem::path output
221 : _audio_stream_per_channel (audio_stream_per_channel)
222 , _audio_channels (channels)
224 , _video_frame_size (video_frame_size)
225 , _video_frame_rate (video_frame_rate)
226 , _audio_frame_rate (audio_frame_rate)
228 _pixel_format = pixel_format (format);
231 case ExportFormat::PRORES:
232 _sample_format = AV_SAMPLE_FMT_S16;
233 _video_codec_name = "prores_ks";
234 _audio_codec_name = "pcm_s16le";
235 av_dict_set (&_video_options, "profile", "3", 0);
236 av_dict_set (&_video_options, "threads", "auto", 0);
238 case ExportFormat::H264_AAC:
239 _sample_format = AV_SAMPLE_FMT_FLTP;
240 _video_codec_name = "libx264";
241 _audio_codec_name = "aac";
242 av_dict_set_int (&_video_options, "crf", x264_crf, 0);
245 DCPOMATIC_ASSERT (false);
248 int r = avformat_alloc_output_context2 (&_format_context, 0, 0, _output.string().c_str());
249 if (!_format_context) {
250 throw EncodeError (N_("avformat_alloc_output_context2"), "FFmpegFileEncoder::FFmpegFileEncoder", r);
256 r = avio_open_boost (&_format_context->pb, _output, AVIO_FLAG_WRITE);
258 throw EncodeError (String::compose(_("Could not open output file %1 (%2)"), _output.string(), r));
261 AVDictionary* options = nullptr;
263 r = avformat_write_header (_format_context, &options);
265 throw EncodeError (N_("avformat_write_header"), N_("FFmpegFileEncoder::FFmpegFileEncoder"), r);
268 _pending_audio = make_shared<AudioBuffers>(channels, 0);
272 FFmpegFileEncoder::~FFmpegFileEncoder ()
274 _audio_streams.clear ();
275 avcodec_close (_video_codec_context);
276 avformat_free_context (_format_context);
281 FFmpegFileEncoder::pixel_format (ExportFormat format)
284 case ExportFormat::PRORES:
285 return AV_PIX_FMT_YUV422P10;
286 case ExportFormat::H264_AAC:
287 return AV_PIX_FMT_YUV420P;
289 DCPOMATIC_ASSERT (false);
292 return AV_PIX_FMT_YUV422P10;
297 FFmpegFileEncoder::setup_video ()
299 _video_codec = avcodec_find_encoder_by_name (_video_codec_name.c_str());
301 throw EncodeError (String::compose("avcodec_find_encoder_by_name failed for %1", _video_codec_name));
304 _video_codec_context = avcodec_alloc_context3 (_video_codec);
305 if (!_video_codec_context) {
306 throw std::bad_alloc ();
309 /* Variable quantisation */
310 _video_codec_context->global_quality = 0;
311 _video_codec_context->width = _video_frame_size.width;
312 _video_codec_context->height = _video_frame_size.height;
313 _video_codec_context->time_base = (AVRational) { 1, _video_frame_rate };
314 _video_codec_context->pix_fmt = _pixel_format;
315 _video_codec_context->flags |= AV_CODEC_FLAG_QSCALE | AV_CODEC_FLAG_GLOBAL_HEADER;
317 if (avcodec_open2 (_video_codec_context, _video_codec, &_video_options) < 0) {
318 throw EncodeError (N_("avcodec_open"), N_("FFmpegFileEncoder::setup_video"));
321 _video_stream = avformat_new_stream (_format_context, _video_codec);
322 if (!_video_stream) {
323 throw EncodeError (N_("avformat_new_stream"), N_("FFmpegFileEncoder::setup_video"));
326 _video_stream->id = _video_stream_index;
327 int r = avcodec_parameters_from_context (_video_stream->codecpar, _video_codec_context);
329 throw EncodeError (N_("avcodec_parameters_from_context"), N_("FFmpegFileEncoder::setup_video"), r);
335 FFmpegFileEncoder::setup_audio ()
337 int const streams = _audio_stream_per_channel ? _audio_channels : 1;
338 int const channels_per_stream = _audio_stream_per_channel ? 1 : _audio_channels;
340 for (int i = 0; i < streams; ++i) {
341 _audio_streams.push_back(
342 make_shared<ExportAudioStream>(
343 _audio_codec_name, channels_per_stream, _audio_frame_rate, _sample_format, _format_context, _audio_stream_index_base + i
351 FFmpegFileEncoder::flush ()
353 if (_pending_audio->frames() > 0) {
354 audio_frame (_pending_audio->frames ());
357 bool flushed_video = false;
358 bool flushed_audio = false;
360 while (!flushed_video || !flushed_audio) {
361 int r = avcodec_send_frame (_video_codec_context, nullptr);
362 if (r < 0 && r != AVERROR_EOF) {
363 /* We get EOF if we've already flushed the stream once */
364 throw EncodeError (N_("avcodec_send_frame"), N_("FFmpegFileEncoder::flush"), r);
367 ffmpeg::Packet packet;
368 r = avcodec_receive_packet (_video_codec_context, packet.get());
369 if (r == AVERROR_EOF) {
370 flushed_video = true;
372 throw EncodeError (N_("avcodec_receive_packet"), N_("FFmpegFileEncoder::flush"), r);
374 packet->stream_index = _video_stream_index;
375 av_interleaved_write_frame (_format_context, packet.get());
378 flushed_audio = true;
379 for (auto i: _audio_streams) {
381 flushed_audio = false;
386 av_write_trailer (_format_context);
391 FFmpegFileEncoder::video (shared_ptr<PlayerVideo> video, DCPTime time)
393 /* All our output formats are video range at the moment */
394 auto image = video->image (
395 bind (&PlayerVideo::force, _pixel_format),
400 auto frame = av_frame_alloc ();
401 DCPOMATIC_ASSERT (frame);
404 boost::mutex::scoped_lock lm (_pending_images_mutex);
405 _pending_images[image->data()[0]] = image;
408 for (int i = 0; i < 3; ++i) {
409 auto buffer = av_buffer_create(image->data()[i], image->stride()[i] * image->size().height, &buffer_free, this, 0);
410 frame->buf[i] = av_buffer_ref (buffer);
411 frame->data[i] = buffer->data;
412 frame->linesize[i] = image->stride()[i];
413 av_buffer_unref (&buffer);
416 frame->width = image->size().width;
417 frame->height = image->size().height;
418 frame->format = _pixel_format;
419 DCPOMATIC_ASSERT (_video_stream->time_base.num == 1);
420 frame->pts = time.get() * _video_stream->time_base.den / DCPTime::HZ;
422 int r = avcodec_send_frame (_video_codec_context, frame);
423 av_frame_free (&frame);
425 throw EncodeError (N_("avcodec_send_frame"), N_("FFmpegFileEncoder::video"), r);
428 ffmpeg::Packet packet;
429 r = avcodec_receive_packet (_video_codec_context, packet.get());
430 if (r < 0 && r != AVERROR(EAGAIN)) {
431 throw EncodeError (N_("avcodec_receive_packet"), N_("FFmpegFileEncoder::video"), r);
433 packet->stream_index = _video_stream_index;
434 av_interleaved_write_frame (_format_context, packet.get());
439 /** Called when the player gives us some audio */
441 FFmpegFileEncoder::audio (shared_ptr<AudioBuffers> audio)
443 _pending_audio->append (audio);
445 DCPOMATIC_ASSERT (!_audio_streams.empty());
446 int frame_size = _audio_streams[0]->frame_size();
447 if (frame_size == 0) {
448 /* codec has AV_CODEC_CAP_VARIABLE_FRAME_SIZE */
449 frame_size = _audio_frame_rate / _video_frame_rate;
452 while (_pending_audio->frames() >= frame_size) {
453 audio_frame (frame_size);
459 FFmpegFileEncoder::audio_frame (int size)
461 if (_audio_stream_per_channel) {
463 for (auto i: _audio_streams) {
464 i->write (size, offset, 1, _pending_audio->data(), _audio_frames);
468 DCPOMATIC_ASSERT (!_audio_streams.empty());
469 DCPOMATIC_ASSERT (_pending_audio->channels());
470 _audio_streams[0]->write (size, 0, _pending_audio->channels(), _pending_audio->data(), _audio_frames);
473 _pending_audio->trim_start (size);
474 _audio_frames += size;
479 FFmpegFileEncoder::subtitle (PlayerText, DCPTimePeriod)
486 FFmpegFileEncoder::buffer_free (void* opaque, uint8_t* data)
488 reinterpret_cast<FFmpegFileEncoder*>(opaque)->buffer_free2(data);
493 FFmpegFileEncoder::buffer_free2 (uint8_t* data)
495 boost::mutex::scoped_lock lm (_pending_images_mutex);
496 if (_pending_images.find(data) != _pending_images.end()) {
497 _pending_images.erase (data);