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/*
Copyright (C) 2022 Carl Hetherington <cth@carlh.net>
This file is part of DCP-o-matic.
DCP-o-matic is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
DCP-o-matic is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with DCP-o-matic. If not, see <http://www.gnu.org/licenses/>.
*/
#include "constants.h"
#include "exceptions.h"
#include "image.h"
#include "ffmpeg_wrapper.h"
#include "vp9_encoder.h"
#include "util.h"
#include <dcp/raw_convert.h>
extern "C" {
#include <libavcodec/avcodec.h>
#include <libavformat/avformat.h>
}
#include <boost/thread.hpp>
#include "i18n.h"
using std::shared_ptr;
using std::string;
using std::vector;
using dcp::raw_convert;
using namespace dcpomatic;
int
write_packet(void* opaque, uint8_t const* buffer, int size)
{
/* Here comes the webm header from the format context */
auto& header = reinterpret_cast<VP9Encoder*>(opaque)->_header;
header.resize(size);
memcpy(header.data(), buffer, size);
return 0;
}
VP9Encoder::VP9Encoder()
{
av_log_set_callback(ffmpeg_log_callback);
auto codec = avcodec_find_encoder_by_name("libvpx-vp9");
if (!codec) {
throw EncodeError("avcodec_find_encoder_by_name failed for libvpx-vp9");
}
_codec_context = avcodec_alloc_context3(codec);
if (!_codec_context) {
throw std::bad_alloc();
}
_codec_context->width = SIGN_LANGUAGE_WIDTH;
_codec_context->height = SIGN_LANGUAGE_HEIGHT;
_codec_context->time_base = AVRational{1, SIGN_LANGUAGE_VIDEO_FRAME_RATE};
_codec_context->pix_fmt = AV_PIX_FMT_YUV420P;
// We need to take up the same bits as the equivalent length of audio
// For some reason the ISDCF example script divides that bitrate by 2;
// maybe to give some overhead?
_codec_context->bit_rate = SIGN_LANGUAGE_AUDIO_FRAME_RATE * AUDIO_BYTES_PER_SAMPLE * 8 / 2;
/* All these options are taken from
* https://github.com/ISDCF/Sign-Language-Video-Encoding/blob/master/encode-vp9-wav
*/
AVDictionary* options = nullptr;
auto constexpr chunk_length_in_video_frames = SIGN_LANGUAGE_CHUNK_LENGTH_IN_SECONDS * SIGN_LANGUAGE_VIDEO_FRAME_RATE;
av_dict_set_int(&options, "keyint_min", chunk_length_in_video_frames, 0);
// GOP size
av_dict_set_int(&options, "g", chunk_length_in_video_frames, 0);
av_dict_set_int(&options, "speed", 6, 0);
av_dict_set_int(&options, "tile-columns", 4, 0);
av_dict_set_int(&options, "frame-parallel", 1, 0);
av_dict_set_int(&options, "static-thresh", 0, 0);
av_dict_set_int(&options, "max-intra-rate", 300, 0);
av_dict_set(&options, "deadline", "realtime", 0);
av_dict_set_int(&options, "lag-in-frames", 0, 0);
av_dict_set_int(&options, "error-resilient", 1, 0);
av_dict_set_int(&options, "minrate", _codec_context->bit_rate, 0);
av_dict_set_int(&options, "maxrate", _codec_context->bit_rate, 0);
int r = avcodec_open2(_codec_context, codec, &options);
if (r < 0) {
throw EncodeError(N_("avcodec_open2"), N_("VP9Encoder::VP9Encoder"));
}
vector<uint8_t> header_buffer(32768);
auto avio_context = avio_alloc_context(header_buffer.data(), header_buffer.size(), 1, this, nullptr, write_packet, nullptr);
if (!avio_context) {
throw std::bad_alloc();
}
AVFormatContext* format_context;
r = avformat_alloc_output_context2(&format_context, nullptr, "webm", nullptr);
if (r < 0) {
throw EncodeError(N_("avformat_alloc_output_context2"), N_("VP9Encoder::VP9Encoder"));
}
format_context->pb = avio_context;
av_dict_set(&format_context->metadata, "MAJOR_BRAND", "isom", 0);
av_dict_set(&format_context->metadata, "MINOR_VERSION", "512", 0);
av_dict_set(&format_context->metadata, "COMPATIBLE_BRANDS", "isomiso2avc1mp41", 0);
av_dict_set(&format_context->metadata, "ENCODER", "Lavf59.27.100", 0);
auto stream = avformat_new_stream(format_context, codec);
if (!stream) {
throw EncodeError(N_("avformat_new_stream"), N_("VP9Encoder::VP9Encoder"));
}
stream->disposition |= AV_DISPOSITION_DEFAULT;
r = avcodec_parameters_from_context(stream->codecpar, _codec_context);
if (r < 0) {
throw EncodeError(N_("avcodec_parameters_from_context"), N_("VP9Encoder::VP9Encoder"), r);
}
stream->avg_frame_rate = { 24, 1 };
stream->codecpar->color_range = AVCOL_RANGE_MPEG;
stream->codecpar->chroma_location = AVCHROMA_LOC_LEFT;
stream->codecpar->field_order = AV_FIELD_PROGRESSIVE;
av_dict_set(&stream->metadata, "ENCODER", "Lavc59.37.100 libvpx-vp9", 0);
av_dict_set(&stream->metadata, "HANDLER_NAME", "VideoHandler", 0);
av_dict_set(&stream->metadata, "VENDOR_ID", "[0][0][0][0]", 0);
AVDictionary* format_options = nullptr;
r = avformat_write_header(format_context, &format_options);
if (r < 0) {
throw EncodeError(N_("avformat_write_header"), N_("VP9Encoder::VP9Encoder"));
}
avformat_free_context(format_context);
}
VP9Encoder::~VP9Encoder()
{
avcodec_free_context(&_codec_context);
}
void
VP9Encoder::encode(shared_ptr<const Image> image, DCPTime time)
{
DCPOMATIC_ASSERT(image->pixel_format() == AV_PIX_FMT_YUV420P);
DCPOMATIC_ASSERT(image->size() == dcp::Size(SIGN_LANGUAGE_WIDTH, SIGN_LANGUAGE_HEIGHT));
auto frame = av_frame_alloc();
if (!frame) {
throw std::bad_alloc();
}
for (int i = 0; i < 3; ++i) {
auto buffer = _pending_images.create_buffer(image, i);
frame->buf[i] = av_buffer_ref(buffer);
frame->data[i] = buffer->data;
frame->linesize[i] = image->stride()[i];
av_buffer_unref(&buffer);
}
frame->width = image->size().width;
frame->height = image->size().height;
frame->format = image->pixel_format();
frame->pts = time.get() * SIGN_LANGUAGE_VIDEO_FRAME_RATE / DCPTime::HZ;
int r = avcodec_send_frame(_codec_context, frame);
av_frame_free(&frame);
if (r < 0) {
throw EncodeError(N_("avcodec_send_frame"), N_("VP9Encoder::video"), r);
}
ffmpeg::Packet packet;
r = avcodec_receive_packet(_codec_context, packet.get());
if (r < 0 && r != AVERROR(EAGAIN)) {
throw EncodeError(N_("avcodec_receive_packet"), N_("VP9Encoder::video"), r);
} else if (r >= 0) {
_pcm_blocks.emplace_back(std::make_pair(time, VP9PCMBlock(packet.get()->data, packet.get()->size, _header)));
_end = time + DCPTime::from_seconds(SIGN_LANGUAGE_CHUNK_LENGTH_IN_SECONDS);
}
}
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