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"
38 using std::make_shared;
40 using std::runtime_error;
41 using std::shared_ptr;
45 using boost::optional;
46 using namespace dcpomatic;
47 #if BOOST_VERSION >= 106100
48 using namespace boost::placeholders;
52 int FFmpegFileEncoder::_video_stream_index = 0;
53 int FFmpegFileEncoder::_audio_stream_index_base = 1;
56 class ExportAudioStream
59 ExportAudioStream (string codec_name, int channels, int frame_rate, AVSampleFormat sample_format, AVFormatContext* format_context, int stream_index)
60 : _format_context (format_context)
61 , _stream_index (stream_index)
63 _codec = avcodec_find_encoder_by_name (codec_name.c_str());
65 throw EncodeError (String::compose("avcodec_find_encoder_by_name failed for %1", codec_name));
68 _codec_context = avcodec_alloc_context3 (_codec);
69 if (!_codec_context) {
70 throw std::bad_alloc ();
73 /* XXX: configurable */
74 _codec_context->bit_rate = channels * 128 * 1024;
75 _codec_context->sample_fmt = sample_format;
76 _codec_context->sample_rate = frame_rate;
77 _codec_context->channel_layout = av_get_default_channel_layout (channels);
78 _codec_context->channels = channels;
80 int r = avcodec_open2 (_codec_context, _codec, 0);
82 throw EncodeError (N_("avcodec_open2"), N_("ExportAudioStream::ExportAudioStream"), r);
85 _stream = avformat_new_stream (format_context, _codec);
87 throw EncodeError (N_("avformat_new_stream"), N_("ExportAudioStream::ExportAudioStream"));
90 _stream->id = stream_index;
91 _stream->disposition |= AV_DISPOSITION_DEFAULT;
92 r = avcodec_parameters_from_context (_stream->codecpar, _codec_context);
94 throw EncodeError (N_("avcodec_parameters_from_context"), N_("ExportAudioStream::ExportAudioStream"), r);
100 avcodec_close (_codec_context);
103 ExportAudioStream (ExportAudioStream const&) = delete;
104 ExportAudioStream& operator= (ExportAudioStream const&) = delete;
106 int frame_size () const {
107 return _codec_context->frame_size;
112 int r = avcodec_send_frame (_codec_context, nullptr);
113 if (r < 0 && r != AVERROR_EOF) {
114 /* We get EOF if we've already flushed the stream once */
115 throw EncodeError (N_("avcodec_send_frame"), N_("ExportAudioStream::flush"), r);
118 ffmpeg::Packet packet;
119 r = avcodec_receive_packet (_codec_context, packet.get());
120 if (r == AVERROR_EOF) {
123 throw EncodeError (N_("avcodec_receive_packet"), N_("ExportAudioStream::flush"), r);
126 packet->stream_index = _stream_index;
127 av_interleaved_write_frame (_format_context, packet.get());
131 void write (int size, int channel_offset, int channels, float** data, int64_t sample_offset)
133 DCPOMATIC_ASSERT (size);
135 auto frame = av_frame_alloc ();
136 DCPOMATIC_ASSERT (frame);
138 int const buffer_size = av_samples_get_buffer_size (0, 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 float* q = reinterpret_cast<float*> (samples);
174 for (int i = 0; i < channels; ++i) {
175 memcpy (q, data[i + channel_offset], sizeof(float) * size);
181 DCPOMATIC_ASSERT (false);
184 DCPOMATIC_ASSERT (_codec_context->time_base.num == 1);
185 frame->pts = sample_offset * _codec_context->time_base.den / _codec_context->sample_rate;
187 r = avcodec_send_frame (_codec_context, frame);
189 av_frame_free (&frame);
191 throw EncodeError (N_("avcodec_send_frame"), N_("ExportAudioStream::write"), r);
194 ffmpeg::Packet packet;
195 r = avcodec_receive_packet (_codec_context, packet.get());
196 if (r < 0 && r != AVERROR(EAGAIN)) {
197 throw EncodeError (N_("avcodec_receive_packet"), N_("ExportAudioStream::write"), r);
199 packet->stream_index = _stream_index;
200 av_interleaved_write_frame (_format_context, packet.get());
205 AVFormatContext* _format_context;
206 AVCodec const * _codec;
207 AVCodecContext* _codec_context;
213 FFmpegFileEncoder::FFmpegFileEncoder (
214 dcp::Size video_frame_size,
215 int video_frame_rate,
216 int audio_frame_rate,
219 bool audio_stream_per_channel,
221 boost::filesystem::path output
223 : _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)
230 _pixel_format = pixel_format (format);
233 case ExportFormat::PRORES:
234 _sample_format = AV_SAMPLE_FMT_S16;
235 _video_codec_name = "prores_ks";
236 _audio_codec_name = "pcm_s16le";
237 av_dict_set (&_video_options, "profile", "3", 0);
238 av_dict_set (&_video_options, "threads", "auto", 0);
240 case ExportFormat::H264_AAC:
241 _sample_format = AV_SAMPLE_FMT_FLTP;
242 _video_codec_name = "libx264";
243 _audio_codec_name = "aac";
244 av_dict_set_int (&_video_options, "crf", x264_crf, 0);
246 case ExportFormat::H264_PCM:
247 _sample_format = AV_SAMPLE_FMT_S32;
248 _video_codec_name = "libx264";
249 _audio_codec_name = "pcm_s24le";
250 av_dict_set_int (&_video_options, "crf", x264_crf, 0);
253 DCPOMATIC_ASSERT (false);
256 int r = avformat_alloc_output_context2 (&_format_context, 0, 0, _output.string().c_str());
257 if (!_format_context) {
258 throw EncodeError (N_("avformat_alloc_output_context2"), "FFmpegFileEncoder::FFmpegFileEncoder", r);
264 r = avio_open_boost (&_format_context->pb, _output, AVIO_FLAG_WRITE);
266 throw EncodeError (String::compose(_("Could not open output file %1 (%2)"), _output.string(), r));
269 AVDictionary* options = nullptr;
271 r = avformat_write_header (_format_context, &options);
273 throw EncodeError (N_("avformat_write_header"), N_("FFmpegFileEncoder::FFmpegFileEncoder"), r);
276 _pending_audio.reset (new AudioBuffers(channels, 0));
280 FFmpegFileEncoder::~FFmpegFileEncoder ()
282 _audio_streams.clear ();
283 avcodec_close (_video_codec_context);
284 avformat_free_context (_format_context);
289 FFmpegFileEncoder::pixel_format (ExportFormat format)
292 case ExportFormat::PRORES:
293 return AV_PIX_FMT_YUV422P10;
294 case ExportFormat::H264_AAC:
295 case ExportFormat::H264_PCM:
296 return AV_PIX_FMT_YUV420P;
298 DCPOMATIC_ASSERT (false);
301 return AV_PIX_FMT_YUV422P10;
306 FFmpegFileEncoder::setup_video ()
308 _video_codec = avcodec_find_encoder_by_name (_video_codec_name.c_str());
310 throw EncodeError (String::compose("avcodec_find_encoder_by_name failed for %1", _video_codec_name));
313 _video_codec_context = avcodec_alloc_context3 (_video_codec);
314 if (!_video_codec_context) {
315 throw std::bad_alloc ();
318 /* Variable quantisation */
319 _video_codec_context->global_quality = 0;
320 _video_codec_context->width = _video_frame_size.width;
321 _video_codec_context->height = _video_frame_size.height;
322 _video_codec_context->time_base = (AVRational) { 1, _video_frame_rate };
323 _video_codec_context->pix_fmt = _pixel_format;
324 _video_codec_context->flags |= AV_CODEC_FLAG_QSCALE | AV_CODEC_FLAG_GLOBAL_HEADER;
326 if (avcodec_open2 (_video_codec_context, _video_codec, &_video_options) < 0) {
327 throw EncodeError (N_("avcodec_open"), N_("FFmpegFileEncoder::setup_video"));
330 _video_stream = avformat_new_stream (_format_context, _video_codec);
331 if (!_video_stream) {
332 throw EncodeError (N_("avformat_new_stream"), N_("FFmpegFileEncoder::setup_video"));
335 _video_stream->id = _video_stream_index;
336 int r = avcodec_parameters_from_context (_video_stream->codecpar, _video_codec_context);
338 throw EncodeError (N_("avcodec_parameters_from_context"), N_("FFmpegFileEncoder::setup_video"), r);
344 FFmpegFileEncoder::setup_audio ()
346 int const streams = _audio_stream_per_channel ? _audio_channels : 1;
347 int const channels_per_stream = _audio_stream_per_channel ? 1 : _audio_channels;
349 for (int i = 0; i < streams; ++i) {
350 _audio_streams.push_back(
351 make_shared<ExportAudioStream>(
352 _audio_codec_name, channels_per_stream, _audio_frame_rate, _sample_format, _format_context, _audio_stream_index_base + i
360 FFmpegFileEncoder::flush ()
362 if (_pending_audio->frames() > 0) {
363 audio_frame (_pending_audio->frames ());
366 bool flushed_video = false;
367 bool flushed_audio = false;
369 while (!flushed_video || !flushed_audio) {
370 int r = avcodec_send_frame (_video_codec_context, nullptr);
371 if (r < 0 && r != AVERROR_EOF) {
372 /* We get EOF if we've already flushed the stream once */
373 throw EncodeError (N_("avcodec_send_frame"), N_("FFmpegFileEncoder::flush"), r);
376 ffmpeg::Packet packet;
377 r = avcodec_receive_packet (_video_codec_context, packet.get());
378 if (r == AVERROR_EOF) {
379 flushed_video = true;
381 throw EncodeError (N_("avcodec_receive_packet"), N_("FFmpegFileEncoder::flush"), r);
383 packet->stream_index = _video_stream_index;
384 av_interleaved_write_frame (_format_context, packet.get());
387 flushed_audio = true;
388 for (auto i: _audio_streams) {
390 flushed_audio = false;
395 av_write_trailer (_format_context);
400 FFmpegFileEncoder::video (shared_ptr<PlayerVideo> video, DCPTime time)
402 /* All our output formats are video range at the moment */
403 auto image = video->image (
404 bind (&PlayerVideo::force, _1, _pixel_format),
410 auto frame = av_frame_alloc ();
411 DCPOMATIC_ASSERT (frame);
414 boost::mutex::scoped_lock lm (_pending_images_mutex);
415 _pending_images[image->data()[0]] = image;
418 for (int i = 0; i < 3; ++i) {
419 auto buffer = av_buffer_create(image->data()[i], image->stride()[i] * image->size().height, &buffer_free, this, 0);
420 frame->buf[i] = av_buffer_ref (buffer);
421 frame->data[i] = buffer->data;
422 frame->linesize[i] = image->stride()[i];
423 av_buffer_unref (&buffer);
426 frame->width = image->size().width;
427 frame->height = image->size().height;
428 frame->format = _pixel_format;
429 DCPOMATIC_ASSERT (_video_stream->time_base.num == 1);
430 frame->pts = time.get() * _video_stream->time_base.den / DCPTime::HZ;
432 int r = avcodec_send_frame (_video_codec_context, frame);
433 av_frame_free (&frame);
435 throw EncodeError (N_("avcodec_send_frame"), N_("FFmpegFileEncoder::video"), r);
438 ffmpeg::Packet packet;
439 r = avcodec_receive_packet (_video_codec_context, packet.get());
440 if (r < 0 && r != AVERROR(EAGAIN)) {
441 throw EncodeError (N_("avcodec_receive_packet"), N_("FFmpegFileEncoder::video"), r);
443 packet->stream_index = _video_stream_index;
444 av_interleaved_write_frame (_format_context, packet.get());
449 /** Called when the player gives us some audio */
451 FFmpegFileEncoder::audio (shared_ptr<AudioBuffers> audio)
453 _pending_audio->append (audio);
455 DCPOMATIC_ASSERT (!_audio_streams.empty());
456 int frame_size = _audio_streams[0]->frame_size();
457 if (frame_size == 0) {
458 /* codec has AV_CODEC_CAP_VARIABLE_FRAME_SIZE */
459 frame_size = _audio_frame_rate / _video_frame_rate;
462 while (_pending_audio->frames() >= frame_size) {
463 audio_frame (frame_size);
469 FFmpegFileEncoder::audio_frame (int size)
471 if (_audio_stream_per_channel) {
473 for (auto i: _audio_streams) {
474 i->write (size, offset, 1, _pending_audio->data(), _audio_frames);
478 DCPOMATIC_ASSERT (!_audio_streams.empty());
479 DCPOMATIC_ASSERT (_pending_audio->channels());
480 _audio_streams[0]->write (size, 0, _pending_audio->channels(), _pending_audio->data(), _audio_frames);
483 _pending_audio->trim_start (size);
484 _audio_frames += size;
489 FFmpegFileEncoder::subtitle (PlayerText, DCPTimePeriod)
496 FFmpegFileEncoder::buffer_free (void* opaque, uint8_t* data)
498 reinterpret_cast<FFmpegFileEncoder*>(opaque)->buffer_free2(data);
503 FFmpegFileEncoder::buffer_free2 (uint8_t* data)
505 boost::mutex::scoped_lock lm (_pending_images_mutex);
506 if (_pending_images.find(data) != _pending_images.end()) {
507 _pending_images.erase (data);