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 namespace dcpomatic;
43 int FFmpegFileEncoder::_video_stream_index = 0;
44 int FFmpegFileEncoder::_audio_stream_index = 1;
46 FFmpegFileEncoder::FFmpegFileEncoder (
47 dcp::Size video_frame_size,
53 boost::filesystem::path output
56 , _audio_channels (channels)
58 , _video_frame_size (video_frame_size)
59 , _video_frame_rate (video_frame_rate)
60 , _audio_frame_rate (audio_frame_rate)
62 _pixel_format = pixel_format (format);
65 case EXPORT_FORMAT_PRORES:
66 _sample_format = AV_SAMPLE_FMT_S16;
67 _video_codec_name = "prores_ks";
68 _audio_codec_name = "pcm_s16le";
69 av_dict_set (&_video_options, "profile", "3", 0);
70 av_dict_set (&_video_options, "threads", "auto", 0);
72 case EXPORT_FORMAT_H264:
73 _sample_format = AV_SAMPLE_FMT_FLTP;
74 _video_codec_name = "libx264";
75 _audio_codec_name = "aac";
76 av_dict_set_int (&_video_options, "crf", x264_crf, 0);
83 int r = avformat_alloc_output_context2 (&_format_context, 0, 0, _output.string().c_str());
84 if (!_format_context) {
85 throw runtime_error (String::compose("could not allocate FFmpeg format context (%1)", r));
88 _video_stream = avformat_new_stream (_format_context, _video_codec);
90 throw runtime_error ("could not create FFmpeg output video stream");
93 _audio_stream = avformat_new_stream (_format_context, _audio_codec);
95 throw runtime_error ("could not create FFmpeg output audio stream");
98 _video_stream->id = _video_stream_index;
99 _video_stream->codec = _video_codec_context;
101 _audio_stream->id = _audio_stream_index;
102 _audio_stream->codec = _audio_codec_context;
104 if (avcodec_open2 (_video_codec_context, _video_codec, &_video_options) < 0) {
105 throw runtime_error ("could not open FFmpeg video codec");
108 r = avcodec_open2 (_audio_codec_context, _audio_codec, 0);
111 av_strerror (r, buffer, sizeof(buffer));
112 throw runtime_error (String::compose ("could not open FFmpeg audio codec (%1)", buffer));
115 if (avio_open_boost (&_format_context->pb, _output, AVIO_FLAG_WRITE) < 0) {
116 throw runtime_error ("could not open FFmpeg output file");
119 if (avformat_write_header (_format_context, 0) < 0) {
120 throw runtime_error ("could not write header to FFmpeg output file");
123 _pending_audio.reset (new AudioBuffers(channels, 0));
127 FFmpegFileEncoder::pixel_format (ExportFormat format)
130 case EXPORT_FORMAT_PRORES:
131 return AV_PIX_FMT_YUV422P10;
132 case EXPORT_FORMAT_H264:
133 return AV_PIX_FMT_YUV420P;
135 DCPOMATIC_ASSERT (false);
138 return AV_PIX_FMT_YUV422P10;
142 FFmpegFileEncoder::setup_video ()
144 _video_codec = avcodec_find_encoder_by_name (_video_codec_name.c_str());
146 throw runtime_error (String::compose ("could not find FFmpeg encoder %1", _video_codec_name));
149 _video_codec_context = avcodec_alloc_context3 (_video_codec);
150 if (!_video_codec_context) {
151 throw runtime_error ("could not allocate FFmpeg video context");
154 avcodec_get_context_defaults3 (_video_codec_context, _video_codec);
156 /* Variable quantisation */
157 _video_codec_context->global_quality = 0;
158 _video_codec_context->width = _video_frame_size.width;
159 _video_codec_context->height = _video_frame_size.height;
160 _video_codec_context->time_base = (AVRational) { 1, _video_frame_rate };
161 _video_codec_context->pix_fmt = _pixel_format;
162 _video_codec_context->flags |= AV_CODEC_FLAG_QSCALE | AV_CODEC_FLAG_GLOBAL_HEADER;
166 FFmpegFileEncoder::setup_audio ()
168 _audio_codec = avcodec_find_encoder_by_name (_audio_codec_name.c_str());
170 throw runtime_error (String::compose ("could not find FFmpeg encoder %1", _audio_codec_name));
173 _audio_codec_context = avcodec_alloc_context3 (_audio_codec);
174 if (!_audio_codec_context) {
175 throw runtime_error ("could not allocate FFmpeg audio context");
178 avcodec_get_context_defaults3 (_audio_codec_context, _audio_codec);
180 /* XXX: configurable */
181 _audio_codec_context->bit_rate = 256 * 1024;
182 _audio_codec_context->sample_fmt = _sample_format;
183 _audio_codec_context->sample_rate = _audio_frame_rate;
184 _audio_codec_context->channel_layout = av_get_default_channel_layout (_audio_channels);
185 _audio_codec_context->channels = _audio_channels;
189 FFmpegFileEncoder::flush ()
191 if (_pending_audio->frames() > 0) {
192 audio_frame (_pending_audio->frames ());
195 bool flushed_video = false;
196 bool flushed_audio = false;
198 while (!flushed_video || !flushed_audio) {
200 av_init_packet (&packet);
205 avcodec_encode_video2 (_video_codec_context, &packet, 0, &got_packet);
207 packet.stream_index = 0;
208 av_interleaved_write_frame (_format_context, &packet);
210 flushed_video = true;
212 av_packet_unref (&packet);
214 av_init_packet (&packet);
218 avcodec_encode_audio2 (_audio_codec_context, &packet, 0, &got_packet);
220 packet.stream_index = 0;
221 av_interleaved_write_frame (_format_context, &packet);
223 flushed_audio = true;
225 av_packet_unref (&packet);
228 av_write_trailer (_format_context);
230 avcodec_close (_video_codec_context);
231 avcodec_close (_audio_codec_context);
232 avio_close (_format_context->pb);
233 avformat_free_context (_format_context);
237 FFmpegFileEncoder::video (shared_ptr<PlayerVideo> video, DCPTime time)
239 shared_ptr<Image> image = video->image (
240 bind (&PlayerVideo::force, _1, _pixel_format),
245 AVFrame* frame = av_frame_alloc ();
246 DCPOMATIC_ASSERT (frame);
248 _pending_images[image->data()[0]] = image;
249 for (int i = 0; i < 3; ++i) {
250 AVBufferRef* buffer = av_buffer_create(image->data()[i], image->stride()[i] * image->size().height, &buffer_free, this, 0);
251 frame->buf[i] = av_buffer_ref (buffer);
252 frame->data[i] = buffer->data;
253 frame->linesize[i] = image->stride()[i];
254 av_buffer_unref (&buffer);
257 frame->width = image->size().width;
258 frame->height = image->size().height;
259 frame->format = _pixel_format;
260 frame->pts = time.seconds() / av_q2d (_video_stream->time_base);
263 av_init_packet (&packet);
268 if (avcodec_encode_video2 (_video_codec_context, &packet, frame, &got_packet) < 0) {
269 throw EncodeError ("FFmpeg video encode failed");
272 if (got_packet && packet.size) {
273 packet.stream_index = _video_stream_index;
274 av_interleaved_write_frame (_format_context, &packet);
275 av_packet_unref (&packet);
278 av_frame_free (&frame);
282 /** Called when the player gives us some audio */
284 FFmpegFileEncoder::audio (shared_ptr<AudioBuffers> audio)
286 _pending_audio->append (audio);
288 int frame_size = _audio_codec_context->frame_size;
289 if (frame_size == 0) {
290 /* codec has AV_CODEC_CAP_VARIABLE_FRAME_SIZE */
291 frame_size = _audio_frame_rate / _video_frame_rate;
294 while (_pending_audio->frames() >= frame_size) {
295 audio_frame (frame_size);
300 FFmpegFileEncoder::audio_frame (int size)
302 DCPOMATIC_ASSERT (size);
304 AVFrame* frame = av_frame_alloc ();
305 DCPOMATIC_ASSERT (frame);
307 int const channels = _pending_audio->channels();
308 DCPOMATIC_ASSERT (channels);
310 int const buffer_size = av_samples_get_buffer_size (0, channels, size, _audio_codec_context->sample_fmt, 0);
311 DCPOMATIC_ASSERT (buffer_size >= 0);
313 void* samples = av_malloc (buffer_size);
314 DCPOMATIC_ASSERT (samples);
316 frame->nb_samples = size;
317 int r = avcodec_fill_audio_frame (frame, channels, _audio_codec_context->sample_fmt, (const uint8_t *) samples, buffer_size, 0);
318 DCPOMATIC_ASSERT (r >= 0);
320 float** p = _pending_audio->data ();
321 switch (_audio_codec_context->sample_fmt) {
322 case AV_SAMPLE_FMT_S16:
324 int16_t* q = reinterpret_cast<int16_t*> (samples);
325 for (int i = 0; i < size; ++i) {
326 for (int j = 0; j < channels; ++j) {
327 *q++ = p[j][i] * 32767;
332 case AV_SAMPLE_FMT_FLTP:
334 float* q = reinterpret_cast<float*> (samples);
335 for (int i = 0; i < channels; ++i) {
336 memcpy (q, p[i], sizeof(float) * size);
342 DCPOMATIC_ASSERT (false);
346 av_init_packet (&packet);
351 if (avcodec_encode_audio2 (_audio_codec_context, &packet, frame, &got_packet) < 0) {
352 throw EncodeError ("FFmpeg audio encode failed");
355 if (got_packet && packet.size) {
356 packet.stream_index = _audio_stream_index;
357 av_interleaved_write_frame (_format_context, &packet);
358 av_packet_unref (&packet);
362 av_frame_free (&frame);
364 _pending_audio->trim_start (size);
368 FFmpegFileEncoder::subtitle (PlayerText, DCPTimePeriod)
374 FFmpegFileEncoder::buffer_free (void* opaque, uint8_t* data)
376 reinterpret_cast<FFmpegFileEncoder*>(opaque)->buffer_free2(data);
380 FFmpegFileEncoder::buffer_free2 (uint8_t* data)
382 _pending_images.erase (data);