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Subsonic API: try to not transcode if the requested format/max bitrate is compatible with the actual file

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This commit is contained in:
emeric
2023-10-15 20:49:34 +02:00
parent fbdc15bd5c
commit 6a3783a4ba
1 changed files with 33 additions and 18 deletions
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src/libs/subsonic/impl/entrypoints/MediaRetrieval.cpp
+33 -18
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@@ -19,6 +19,7 @@
#include "MediaRetrieval.hpp"
#include "av/IAudioFile.hpp"
#include "av/TranscodeParameters.hpp"
#include "av/TranscodeResourceHandlerCreator.hpp"
#include "av/Types.hpp"
@@ -99,27 +100,41 @@ namespace API::Subsonic
parameters.inputFileParameters.duration = track->getDuration();
}
if (format != "raw") // raw => no transcode
if (format == "raw") // raw => no transcode
return parameters;
const auto audioFile{ Av::parseAudioFile(parameters.inputFileParameters.trackPath) };
// check if transcode is really needed or not
// same format as requested, bitrate is lower than requested => no need to transcode
if (const auto streamInfo{ audioFile->getBestStreamInfo() })
{
const User::pointer user{ User::find(context.dbSession, context.userId) };
if (!user)
throw UserNotAuthorizedError{};
Av::TranscodeParameters& transcodeParameters{ parameters.transcodeParameters.emplace() };
transcodeParameters.stripMetadata = false; // We want clients to use metadata (offline use, replay gain, etc.)
transcodeParameters.offset = std::chrono::seconds{ timeOffset };
if (std::optional<Av::Format> requestedFormat{ subsonicStreamFormatToAvFormat(format) })
transcodeParameters.format = *requestedFormat;
else
transcodeParameters.format = userTranscodeFormatToAvFormat(user->getSubsonicDefaultTranscodeFormat());
transcodeParameters.bitrate = user->getSubsonicDefaultTranscodeBitrate();
if (maxBitRate != 0)
transcodeParameters.bitrate = Utils::clamp(transcodeParameters.bitrate, std::size_t{ 48 }, maxBitRate);
// assume reported codec is "mp3", "opus", "vorbis", etc.
if (StringUtils::stringCaseInsensitiveEqual(streamInfo->codec, format) && (maxBitRate == 0 || (streamInfo->bitrate / 1000) <= maxBitRate))
{
LMS_LOG(API_SUBSONIC, DEBUG) << "stream parameters are compatible with actual file: no transcode";
return parameters;
}
}
const User::pointer user{ User::find(context.dbSession, context.userId) };
if (!user)
throw UserNotAuthorizedError{};
Av::TranscodeParameters& transcodeParameters{ parameters.transcodeParameters.emplace() };
transcodeParameters.stripMetadata = false; // We want clients to use metadata (offline use, replay gain, etc.)
transcodeParameters.offset = std::chrono::seconds{ timeOffset };
if (std::optional<Av::Format> requestedFormat{ subsonicStreamFormatToAvFormat(format) })
transcodeParameters.format = *requestedFormat;
else
transcodeParameters.format = userTranscodeFormatToAvFormat(user->getSubsonicDefaultTranscodeFormat());
transcodeParameters.bitrate = user->getSubsonicDefaultTranscodeBitrate();
if (maxBitRate != 0)
transcodeParameters.bitrate = Utils::clamp(transcodeParameters.bitrate, std::size_t{ 48000 }, maxBitRate * 1000);
return parameters;
}
}