104 lines
4.3 KiB
C++
104 lines
4.3 KiB
C++
/*
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* Copyright (C) 2020 Emeric Poupon
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*
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* This file is part of LMS.
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*
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* LMS is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* LMS is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with LMS. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "TranscodingResourceHandler.hpp"
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#include "core/ILogger.hpp"
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namespace lms::av::transcoding
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{
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namespace
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{
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std::size_t doEstimateContentLength(const InputParameters& inputParameters, const OutputParameters& outputParameters)
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{
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const std::size_t estimatedContentLength{ outputParameters.bitrate / 8 * static_cast<std::size_t>(std::chrono::duration_cast<std::chrono::milliseconds>(inputParameters.duration).count()) / 1000 };
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return estimatedContentLength;
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}
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}
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std::unique_ptr<IResourceHandler> createResourceHandler(const InputParameters& inputParameters, const OutputParameters& outputParameters, bool estimateContentLength)
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{
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return std::make_unique<TranscodingResourceHandler>(inputParameters, outputParameters, estimateContentLength);
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}
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// TODO set some nice HTTP return code
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TranscodingResourceHandler::TranscodingResourceHandler(const InputParameters& inputParameters, const OutputParameters& outputParameters, bool estimateContentLength)
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: _estimatedContentLength{ estimateContentLength ? std::make_optional(doEstimateContentLength(inputParameters, outputParameters)) : std::nullopt }
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, _transcoder{ inputParameters, outputParameters }
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{
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if (_estimatedContentLength)
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LMS_LOG(TRANSCODING, DEBUG, "Estimated content length = " << *_estimatedContentLength);
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else
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LMS_LOG(TRANSCODING, DEBUG, "Not using estimated content length");
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}
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Wt::Http::ResponseContinuation* TranscodingResourceHandler::processRequest(const Wt::Http::Request& /*request*/, Wt::Http::Response& response)
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{
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if (_estimatedContentLength)
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response.setContentLength(*_estimatedContentLength);
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response.setMimeType(_transcoder.getOutputMimeType());
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LMS_LOG(TRANSCODING, DEBUG, "Transcoder finished = " << _transcoder.finished() << ", total served bytes = " << _totalServedByteCount << ", mime type = " << _transcoder.getOutputMimeType());
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if (_bytesReadyCount > 0)
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{
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LMS_LOG(TRANSCODING, DEBUG, "Writing " << _bytesReadyCount << " bytes back to client");
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response.out().write(reinterpret_cast<const char*>(&_buffer[0]), _bytesReadyCount);
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_totalServedByteCount += _bytesReadyCount;
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_bytesReadyCount = 0;
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}
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if (!_transcoder.finished())
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{
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Wt::Http::ResponseContinuation* continuation{ response.createContinuation() };
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continuation->waitForMoreData();
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_transcoder.asyncRead(_buffer.data(), _buffer.size(), [this, continuation](std::size_t nbBytesRead)
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{
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LMS_LOG(TRANSCODING, DEBUG, "Have " << nbBytesRead << " more bytes to send back");
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assert(_bytesReadyCount == 0);
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_bytesReadyCount = nbBytesRead;
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continuation->haveMoreData();
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});
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return continuation;
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}
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else
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{
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// pad with 0 if necessary as duration may not be accurate
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if (_estimatedContentLength && *_estimatedContentLength > _totalServedByteCount)
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{
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const std::size_t padSize{ *_estimatedContentLength - _totalServedByteCount };
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LMS_LOG(TRANSCODING, DEBUG, "Adding " << padSize << " padding bytes");
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for (std::size_t i{}; i < padSize; ++i)
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response.out().put(0);
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_totalServedByteCount += padSize;
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}
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LMS_LOG(TRANSCODING, DEBUG, "Transcoding finished. Total served byte count = " << _totalServedByteCount);
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}
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return {};
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}
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}
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