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;
43 #if BOOST_VERSION >= 106100
44 using namespace boost::placeholders;
47 int FFmpegFileEncoder::_video_stream_index = 0;
48 int FFmpegFileEncoder::_audio_stream_index_base = 1;
51 class ExportAudioStream : public boost::noncopyable
54 ExportAudioStream (string codec_name, int channels, int frame_rate, AVSampleFormat sample_format, AVFormatContext* format_context, int stream_index)
55 : _format_context (format_context)
56 , _stream_index (stream_index)
58 _codec = avcodec_find_encoder_by_name (codec_name.c_str());
60 throw runtime_error (String::compose("could not find FFmpeg encoder %1", codec_name));
63 _codec_context = avcodec_alloc_context3 (_codec);
64 if (!_codec_context) {
65 throw runtime_error ("could not allocate FFmpeg audio context");
68 avcodec_get_context_defaults3 (_codec_context, _codec);
70 /* XXX: configurable */
71 _codec_context->bit_rate = channels * 128 * 1024;
72 _codec_context->sample_fmt = sample_format;
73 _codec_context->sample_rate = frame_rate;
74 _codec_context->channel_layout = av_get_default_channel_layout (channels);
75 _codec_context->channels = channels;
77 _stream = avformat_new_stream (format_context, _codec);
79 throw runtime_error ("could not create FFmpeg output audio stream");
82 _stream->id = stream_index;
83 _stream->disposition |= AV_DISPOSITION_DEFAULT;
84 DCPOMATIC_DISABLE_WARNINGS
85 _stream->codec = _codec_context;
86 DCPOMATIC_ENABLE_WARNINGS
88 int r = avcodec_open2 (_codec_context, _codec, 0);
91 av_strerror (r, buffer, sizeof(buffer));
92 throw runtime_error (String::compose("could not open FFmpeg audio codec (%1)", buffer));
98 avcodec_close (_codec_context);
101 int frame_size () const {
102 return _codec_context->frame_size;
108 av_init_packet (&packet);
111 bool flushed = false;
114 DCPOMATIC_DISABLE_WARNINGS
115 avcodec_encode_audio2 (_codec_context, &packet, 0, &got_packet);
116 DCPOMATIC_ENABLE_WARNINGS
118 packet.stream_index = 0;
119 av_interleaved_write_frame (_format_context, &packet);
123 av_packet_unref (&packet);
127 void write (int size, int channel_offset, int channels, float** data, int64_t sample_offset)
129 DCPOMATIC_ASSERT (size);
131 AVFrame* frame = av_frame_alloc ();
132 DCPOMATIC_ASSERT (frame);
134 int const buffer_size = av_samples_get_buffer_size (0, channels, size, _codec_context->sample_fmt, 0);
135 DCPOMATIC_ASSERT (buffer_size >= 0);
137 void* samples = av_malloc (buffer_size);
138 DCPOMATIC_ASSERT (samples);
140 frame->nb_samples = size;
141 int r = avcodec_fill_audio_frame (frame, channels, _codec_context->sample_fmt, (const uint8_t *) samples, buffer_size, 0);
142 DCPOMATIC_ASSERT (r >= 0);
144 switch (_codec_context->sample_fmt) {
145 case AV_SAMPLE_FMT_S16:
147 int16_t* q = reinterpret_cast<int16_t*> (samples);
148 for (int i = 0; i < size; ++i) {
149 for (int j = 0; j < channels; ++j) {
150 *q++ = data[j + channel_offset][i] * 32767;
155 case AV_SAMPLE_FMT_S32:
157 int32_t* q = reinterpret_cast<int32_t*> (samples);
158 for (int i = 0; i < size; ++i) {
159 for (int j = 0; j < channels; ++j) {
160 *q++ = data[j + channel_offset][i] * 2147483647;
165 case AV_SAMPLE_FMT_FLTP:
167 float* q = reinterpret_cast<float*> (samples);
168 for (int i = 0; i < channels; ++i) {
169 memcpy (q, data[i + channel_offset], sizeof(float) * size);
175 DCPOMATIC_ASSERT (false);
178 DCPOMATIC_ASSERT (_codec_context->time_base.num == 1);
179 frame->pts = sample_offset * _codec_context->time_base.den / _codec_context->sample_rate;
182 av_init_packet (&packet);
187 DCPOMATIC_DISABLE_WARNINGS
188 if (avcodec_encode_audio2 (_codec_context, &packet, frame, &got_packet) < 0) {
189 throw EncodeError ("FFmpeg audio encode failed");
191 DCPOMATIC_ENABLE_WARNINGS
193 if (got_packet && packet.size) {
194 packet.stream_index = _stream_index;
195 av_interleaved_write_frame (_format_context, &packet);
196 av_packet_unref (&packet);
200 av_frame_free (&frame);
204 AVFormatContext* _format_context;
206 AVCodecContext* _codec_context;
212 FFmpegFileEncoder::FFmpegFileEncoder (
213 dcp::Size video_frame_size,
214 int video_frame_rate,
215 int audio_frame_rate,
218 bool audio_stream_per_channel,
220 boost::filesystem::path output
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 int r = avformat_alloc_output_context2 (&_format_context, 0, 0, _output.string().c_str());
258 if (!_format_context) {
259 throw runtime_error (String::compose("could not allocate FFmpeg format context (%1)", r));
265 r = avio_open_boost (&_format_context->pb, _output, AVIO_FLAG_WRITE);
267 throw runtime_error (String::compose("could not open FFmpeg output file %1 (%2)", _output.string(), r));
270 AVDictionary* options = 0;
272 if (avformat_write_header (_format_context, &options) < 0) {
273 throw runtime_error ("could not write header to FFmpeg output file");
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 EXPORT_FORMAT_PRORES:
293 return AV_PIX_FMT_YUV422P10;
294 case EXPORT_FORMAT_H264_AAC:
295 case EXPORT_FORMAT_H264_PCM:
296 return AV_PIX_FMT_YUV420P;
298 DCPOMATIC_ASSERT (false);
301 return AV_PIX_FMT_YUV422P10;
305 FFmpegFileEncoder::setup_video ()
307 _video_codec = avcodec_find_encoder_by_name (_video_codec_name.c_str());
309 throw runtime_error (String::compose ("could not find FFmpeg encoder %1", _video_codec_name));
312 _video_codec_context = avcodec_alloc_context3 (_video_codec);
313 if (!_video_codec_context) {
314 throw runtime_error ("could not allocate FFmpeg video context");
317 avcodec_get_context_defaults3 (_video_codec_context, _video_codec);
319 /* Variable quantisation */
320 _video_codec_context->global_quality = 0;
321 _video_codec_context->width = _video_frame_size.width;
322 _video_codec_context->height = _video_frame_size.height;
323 _video_codec_context->time_base = (AVRational) { 1, _video_frame_rate };
324 _video_codec_context->pix_fmt = _pixel_format;
325 _video_codec_context->flags |= AV_CODEC_FLAG_QSCALE | AV_CODEC_FLAG_GLOBAL_HEADER;
327 _video_stream = avformat_new_stream (_format_context, _video_codec);
328 if (!_video_stream) {
329 throw runtime_error ("could not create FFmpeg output video stream");
332 DCPOMATIC_DISABLE_WARNINGS
333 _video_stream->id = _video_stream_index;
334 _video_stream->codec = _video_codec_context;
335 DCPOMATIC_ENABLE_WARNINGS
337 if (avcodec_open2 (_video_codec_context, _video_codec, &_video_options) < 0) {
338 throw runtime_error ("could not open FFmpeg video codec");
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 shared_ptr<ExportAudioStream>(
352 new ExportAudioStream(_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) {
371 av_init_packet (&packet);
376 DCPOMATIC_DISABLE_WARNINGS
377 avcodec_encode_video2 (_video_codec_context, &packet, 0, &got_packet);
378 DCPOMATIC_ENABLE_WARNINGS
380 packet.stream_index = 0;
381 av_interleaved_write_frame (_format_context, &packet);
383 flushed_video = true;
385 av_packet_unref (&packet);
387 flushed_audio = true;
388 BOOST_FOREACH (shared_ptr<ExportAudioStream> i, _audio_streams) {
390 flushed_audio = false;
395 av_write_trailer (_format_context);
399 FFmpegFileEncoder::video (shared_ptr<PlayerVideo> video, DCPTime time)
401 /* All our output formats are video range at the moment */
402 shared_ptr<Image> image = video->image (
403 bind (&PlayerVideo::force, _1, _pixel_format),
409 AVFrame* frame = av_frame_alloc ();
410 DCPOMATIC_ASSERT (frame);
413 boost::mutex::scoped_lock lm (_pending_images_mutex);
414 _pending_images[image->data()[0]] = image;
417 for (int i = 0; i < 3; ++i) {
418 AVBufferRef* buffer = av_buffer_create(image->data()[i], image->stride()[i] * image->size().height, &buffer_free, this, 0);
419 frame->buf[i] = av_buffer_ref (buffer);
420 frame->data[i] = buffer->data;
421 frame->linesize[i] = image->stride()[i];
422 av_buffer_unref (&buffer);
425 frame->width = image->size().width;
426 frame->height = image->size().height;
427 frame->format = _pixel_format;
428 DCPOMATIC_ASSERT (_video_stream->time_base.num == 1);
429 frame->pts = time.get() * _video_stream->time_base.den / DCPTime::HZ;
432 av_init_packet (&packet);
437 DCPOMATIC_DISABLE_WARNINGS
438 if (avcodec_encode_video2 (_video_codec_context, &packet, frame, &got_packet) < 0) {
439 throw EncodeError ("FFmpeg video encode failed");
441 DCPOMATIC_ENABLE_WARNINGS
443 if (got_packet && packet.size) {
444 packet.stream_index = _video_stream_index;
445 av_interleaved_write_frame (_format_context, &packet);
446 av_packet_unref (&packet);
449 av_frame_free (&frame);
453 /** Called when the player gives us some audio */
455 FFmpegFileEncoder::audio (shared_ptr<AudioBuffers> audio)
457 _pending_audio->append (audio);
459 DCPOMATIC_ASSERT (!_audio_streams.empty());
460 int frame_size = _audio_streams[0]->frame_size();
461 if (frame_size == 0) {
462 /* codec has AV_CODEC_CAP_VARIABLE_FRAME_SIZE */
463 frame_size = _audio_frame_rate / _video_frame_rate;
466 while (_pending_audio->frames() >= frame_size) {
467 audio_frame (frame_size);
472 FFmpegFileEncoder::audio_frame (int size)
474 if (_audio_stream_per_channel) {
476 BOOST_FOREACH (shared_ptr<ExportAudioStream> 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;
491 FFmpegFileEncoder::subtitle (PlayerText, DCPTimePeriod)
497 FFmpegFileEncoder::buffer_free (void* opaque, uint8_t* data)
499 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);