Transcode, limit output birate to the media bitrate (no need to upscale)

transcode/AvConvTranscoder.cpp

@@ -58,9 +58,9 @@ AvConvTranscoder::AvConvTranscoder(const Parameters& parameters)
 	oss << " -i \"" << _parameters.getInputMediaFile().getPath().string() << "\"";
 
 	// Output bitrates
-	oss << " -b:a " << _parameters.getOutputAudioBitrate() ;
+	oss << " -b:a " << _parameters.getOutputBitrate(Stream::Audio) ;
 	if (_parameters.getOutputFormat().getType() == Format::Video)
-		oss << " -b:v " << _parameters.getOutputVideoBitrate();
+		oss << " -b:v " << _parameters.getOutputBitrate(Stream::Video);
 
 	// Stream mapping
 	{

transcode/InputMediaFile.cpp

@@ -53,6 +53,7 @@ InputMediaFile::InputMediaFile(const boost::filesystem::path& p)
 
 			_streams.push_back( Stream(avStreamId,
 						type,
+						avStream.getCodecContext().getBitRate(),
 						avStream.getMetadata().get("language"),	// TODO define somewhere else?
 						avStream.getCodecContext().getCodecDesc()
 						));
@@ -90,5 +91,18 @@ InputMediaFile::getStreams(Stream::Type type) const
 	return res;
 }
 
+const Stream&
+InputMediaFile::getStream(Stream::Id index) const
+{
+	BOOST_FOREACH(const Stream& stream, _streams)
+	{
+		if (stream.getId() == index)
+			return stream;
+	}
+	LMS_LOG(MOD_TRANSCODE, SEV_CRIT) << "Cannot find stream index " << index << " in stream map!";
+	throw std::runtime_error("InputMediaFile::getStream, cannot find stream idx");
+}
+
+
 } // namespace Transcode
 

transcode/InputMediaFile.hpp

@@ -38,6 +38,7 @@ class InputMediaFile
 		const std::vector< CoverArt::CoverArt >&	getCovers(void) const { return _covers; }
 
 		// Stream handling
+		const Stream&				getStream(Stream::Id id) const;
 		std::vector<Stream>			getStreams(Stream::Type type) const;
 		const std::map<Stream::Type, Stream::Id>& getBestStreams(void) const	{return _bestStreams;}
 

transcode/Parameters.cpp

@@ -1,3 +1,6 @@
+
+#include "logger/Logger.hpp"
+
 #include "av/InputFormatContext.hpp"
 
 #include "Parameters.hpp"
@@ -13,30 +16,61 @@ getMimeType(Format format)
 }
 
 Parameters::Parameters(const InputMediaFile& inputMediaFile,
-		const Format& outputFormat,
-		std::size_t audioBitrate)
+		const Format& outputFormat)
 	:
 _mediaFile(inputMediaFile),
-_outputFormat(outputFormat),
-_outputAudioBitrate(audioBitrate),
-_outputVideoBitrate(0)
+_outputFormat(outputFormat)
 {
 	// By default, select the best stream indexes
 	_inputStreams = _mediaFile.getBestStreams();
+
+//	setBitrate(Stream::Audio, 0);
+//	setBitrate(Stream::Video, 0);
 }
 
-Parameters::Parameters(const InputMediaFile& inputMediaFile,
-		const Format& outputFormat,
-		std::size_t audioBitrate,
-		std::size_t videoBitrate)
-	:
-_mediaFile(inputMediaFile),
-_outputFormat(outputFormat),
-_outputAudioBitrate(audioBitrate),
-_outputVideoBitrate(videoBitrate)
+std::size_t
+Parameters::setBitrate(Stream::Type type, std::size_t bitrate)
 {
-	// By default, select the best stream indexes
-	_inputStreams = _mediaFile.getBestStreams();
+	// Limit the output bitrate to the input bitrate
+	if (_inputStreams.find(type) != _inputStreams.end())
+	{
+		const Transcode::Stream& stream = _mediaFile.getStream( _inputStreams[type] );
+
+		LMS_LOG(MOD_TRANSCODE, SEV_DEBUG) << "Stream bitrate = " << stream.getBitrate();
+
+		if (!bitrate || bitrate > stream.getBitrate())
+		{
+			LMS_LOG(MOD_TRANSCODE, SEV_INFO) << "Setting bitrate for stream idx " << _inputStreams[type] << " to input bitrate (" << stream.getBitrate() << ")";
+			_outputBitrate[type] = stream.getBitrate();
+		}
+		else
+		{
+			LMS_LOG(MOD_TRANSCODE, SEV_DEBUG) << "Setting bitrate for stream idx " << _inputStreams[type] << " to " << bitrate;
+			_outputBitrate[type] = bitrate;
+		}
+		return _outputBitrate[type];
+	}
+	else
+	{
+		LMS_LOG(MOD_TRANSCODE, SEV_DEBUG) << "Cannot find stream type " << type;
+		return 0;
+	}
+}
+
+std::size_t
+Parameters::getOutputBitrate(Stream::Type type) const
+{
+	std::map<Stream::Type, std::size_t>::const_iterator it = _outputBitrate.find(type);
+
+	if (it != _inputStreams.end())
+	{
+		return it->second;
+	}
+	else
+	{
+		LMS_LOG(MOD_TRANSCODE, SEV_DEBUG) << "output bitrate not set for type " << type;
+		return 0;
+	}
 }
 
 } // namespace Transcode

transcode/Parameters.hpp

@@ -18,12 +18,12 @@ class Parameters {
 
 	public:
 
-		Parameters(const InputMediaFile& InputFile, const Format& outputFormat, std::size_t audioBitrate);
-		Parameters(const InputMediaFile& InputFile, const Format& outputFormat, std::size_t audioBitrate, std::size_t videoBitrate);
+		Parameters(const InputMediaFile& InputFile, const Format& outputFormat);
 
 		// Modifiers
 		void setOffset(boost::posix_time::time_duration offset)	{ _offset = offset; }	// Set input offset
 		void setOutputFormat(const Format& format)		{ _outputFormat = format; }
+		std::size_t setBitrate(Stream::Type type, std::size_t bitrate);
 
 		// Manually select an input stream to output
 		// There can be only one stream per each type (video, audio, subtitle)
@@ -34,8 +34,7 @@ class Parameters {
 		//Accessors
 		boost::posix_time::time_duration	getOffset(void) const {return _offset;}
 		const Format&				getOutputFormat(void) const { return _outputFormat; }
-		std::size_t				getOutputAudioBitrate(void) const { return _outputAudioBitrate; }
-		std::size_t				getOutputVideoBitrate(void) const { return _outputVideoBitrate; }
+		std::size_t				getOutputBitrate(Stream::Type type) const;
 		const InputMediaFile&			getInputMediaFile(void) const { return _mediaFile;}
 		InputMediaFile&				getInputMediaFile(void) { return _mediaFile;}
 
@@ -47,8 +46,7 @@ class Parameters {
 		boost::posix_time::time_duration	_offset;		// start input offset
 
 		Format					_outputFormat;		// OGA, OGV, etc.
-		std::size_t				_outputAudioBitrate;	// 192000, 128000, etc.
-		std::size_t				_outputVideoBitrate;	// 300000, 700000, etc.
+		std::map<Stream::Type, std::size_t>	_outputBitrate;
 
 		StreamMap				_inputStreams;
 

transcode/Stream.hpp

@@ -20,12 +20,13 @@ class Stream
 
 		typedef std::size_t  Id;
 
-		Stream(Id id, Type type, const std::string& lang, const std::string& desc)
-			: _id(id), _type(type), _language(lang), _desc(desc) {}
+		Stream(Id id, Type type, std::size_t bitrate, const std::string& lang, const std::string& desc)
+			: _id(id), _type(type), _bitrate(bitrate), _language(lang), _desc(desc) {}
 
 		// Accessors
 		Id			getId() const		{ return _id;}
 		Type			getType() const		{ return _type;}
+		std::size_t		getBitrate() const	{ return _bitrate;}
 		const std::string&	getLanguage() const	{ return _language;}
 		const std::string&	getDesc() const		{ return _desc;}
 
@@ -33,6 +34,7 @@ class Stream
 
 		Id		_id;
 		Type		_type;
+		std::size_t	_bitrate;
 		std::string	_language;
 		std::string	_desc;