Renamed some transcoding stuff + now retrieve decoder codecs

2023-11-12 20:51:42 +01:00
parent 53943c4118
commit 87d70465e9
22 changed files with 711 additions and 712 deletions
@@ -0,0 +1,103 @@
+/*
+ * Copyright (C) 2020 Emeric Poupon
+ *
+ * This file is part of LMS.
+ *
+ * LMS 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 3 of the License, or
+ * (at your option) any later version.
+ *
+ * LMS 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 LMS.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "TranscodingResourceHandler.hpp"
+#include "utils/Logger.hpp"
+
+namespace Av::Transcoding
+{
+    namespace
+    {
+        std::size_t doEstimateContentLength(const InputParameters& inputParameters, const OutputParameters& outputParameters)
+        {
+            const std::size_t estimatedContentLength{ outputParameters.bitrate / 8 * static_cast<std::size_t>(std::chrono::duration_cast<std::chrono::milliseconds>(inputParameters.duration).count()) / 1000 };
+            return estimatedContentLength;
+        }
+    }
+
+    std::unique_ptr<IResourceHandler> createResourceHandler(const InputParameters& inputParameters, const OutputParameters& outputParameters, bool estimateContentLength)
+    {
+        return std::make_unique<TranscodingResourceHandler>(inputParameters, outputParameters, estimateContentLength);
+    }
+
+    // TODO set some nice HTTP return code
+
+    TranscodingResourceHandler::TranscodingResourceHandler(const InputParameters& inputParameters, const OutputParameters& outputParameters, bool estimateContentLength)
+        : _estimatedContentLength{ estimateContentLength ? std::make_optional(doEstimateContentLength(inputParameters, outputParameters)) : std::nullopt }
+        , _transcoder{ inputParameters, outputParameters }
+    {
+        if (_estimatedContentLength)
+            LMS_LOG(TRANSCODE, DEBUG) << "Estimated content length = " << *_estimatedContentLength;
+        else
+            LMS_LOG(TRANSCODE, DEBUG) << "Not using estimated content length";
+    }
+
+    Wt::Http::ResponseContinuation* TranscodingResourceHandler::processRequest(const Wt::Http::Request& /*request*/, Wt::Http::Response& response)
+    {
+        if (_estimatedContentLength)
+            response.setContentLength(*_estimatedContentLength);
+        response.setMimeType(_transcoder.getOutputMimeType());
+        LMS_LOG(TRANSCODE, DEBUG) << "Transcoder finished = " << _transcoder.finished() << ", total served bytes = " << _totalServedByteCount << ", mime type = " << _transcoder.getOutputMimeType();
+
+        if (_bytesReadyCount > 0)
+        {
+            LMS_LOG(TRANSCODE, DEBUG) << "Writing " << _bytesReadyCount << " bytes back to client";
+
+            response.out().write(reinterpret_cast<const char*>(&_buffer[0]), _bytesReadyCount);
+            _totalServedByteCount += _bytesReadyCount;
+            _bytesReadyCount = 0;
+        }
+
+        if (!_transcoder.finished())
+        {
+            Wt::Http::ResponseContinuation* continuation{ response.createContinuation() };
+            continuation->waitForMoreData();
+            _transcoder.asyncRead(_buffer.data(), _buffer.size(), [=](std::size_t nbBytesRead)
+                {
+                    LMS_LOG(TRANSCODE, DEBUG) << "Have " << nbBytesRead << " more bytes to send back";
+
+                    assert(_bytesReadyCount == 0);
+                    _bytesReadyCount = nbBytesRead;
+                    continuation->haveMoreData();
+                });
+
+            return continuation;
+        }
+        else
+        {
+            // pad with 0 if necessary as duration may not be accurate
+            if (_estimatedContentLength && *_estimatedContentLength > _totalServedByteCount)
+            {
+                const std::size_t padSize{ *_estimatedContentLength - _totalServedByteCount };
+
+                LMS_LOG(TRANSCODE, DEBUG) << "Adding " << padSize << " padding bytes";
+
+                for (std::size_t i{}; i < padSize; ++i)
+                    response.out().put(0);
+
+                _totalServedByteCount += padSize;
+            }
+
+            LMS_LOG(TRANSCODE, DEBUG) << "Transcoding finished. Total served byte count = " << _totalServedByteCount;
+        }
+
+        return {};
+    }
+}
+