Add "session rate" as a possible sample rate for export formats

git-svn-id: svn://localhost/ardour2/branches/3.0@8294 d708f5d6-7413-0410-9779-e7cbd77b26cf

libs/ardour/ardour/export_format_base.h

@@ -94,6 +94,7 @@ class ExportFormatBase {
 
 	enum SampleRate {
 		SR_None = 0,
+		SR_Session = 1,
 		SR_22_05 = 220500,
 		SR_44_1 = 44100,
 		SR_48 = 48000,
@@ -162,6 +163,8 @@ class ExportFormatBase {
 
 	void set_extension (std::string const & extension) { _extension = extension; }
 	std::string const & extension () const { return _extension; }
+	
+	static SampleRate nearest_sample_rate (framecnt_t sample_rate);
 
   protected:
 

libs/ardour/ardour/export_formats.h

@@ -156,7 +156,7 @@ class HasSampleFormat : public PBD::ScopedConnectionList {
 class ExportFormatLinear : public ExportFormat, public HasSampleFormat {
   public:
 
-        ExportFormatLinear (std::string name, FormatId format_id);
+	ExportFormatLinear (std::string name, FormatId format_id);
 	~ExportFormatLinear () {};
 
 	bool set_compatibility_state (ExportFormatCompatibility const & compatibility);

libs/ardour/enums.cc

@@ -487,6 +487,7 @@ setup_enum_writer ()
 	REGISTER (_ExportFormatBase_Quality);
 
 	REGISTER_CLASS_ENUM (ExportFormatBase, SR_None);
+	REGISTER_CLASS_ENUM (ExportFormatBase, SR_Session);
 	REGISTER_CLASS_ENUM (ExportFormatBase, SR_22_05);
 	REGISTER_CLASS_ENUM (ExportFormatBase, SR_44_1);
 	REGISTER_CLASS_ENUM (ExportFormatBase, SR_48);

libs/ardour/export_format_base.cc

@@ -198,4 +198,30 @@ ExportFormatBase::do_set_operation (ExportFormatBase const & other, SetOperation
 	return result;
 }
 
+ExportFormatBase::SampleRate
+ExportFormatBase::nearest_sample_rate (framecnt_t sample_rate)
+{
+	int diff = 0;
+	int smallest_diff = INT_MAX;
+	SampleRate best_match = SR_None;
+	
+	#define DO_SR_COMPARISON(rate) \
+	diff = std::abs((rate) - sample_rate); \
+	if(diff < smallest_diff) { \
+		smallest_diff = diff; \
+		best_match = (rate); \
+	}
+
+	DO_SR_COMPARISON(SR_22_05);
+	DO_SR_COMPARISON(SR_22_05);
+	DO_SR_COMPARISON(SR_44_1);
+	DO_SR_COMPARISON(SR_48);
+	DO_SR_COMPARISON(SR_88_2);
+	DO_SR_COMPARISON(SR_96);
+	DO_SR_COMPARISON(SR_192);
+	
+	return best_match;
+	#undef DO_SR_COMPARISON
+}
+
 }; // namespace ARDOUR

libs/ardour/export_format_manager.cc

@@ -203,6 +203,7 @@ ExportFormatManager::init_formats ()
 void
 ExportFormatManager::init_sample_rates ()
 {
+	add_sample_rate (SampleRatePtr (new SampleRateState (ExportFormatBase::SR_Session, _("Session rate"))));
 	add_sample_rate (SampleRatePtr (new SampleRateState (ExportFormatBase::SR_22_05, "22,05 kHz")));
 	add_sample_rate (SampleRatePtr (new SampleRateState (ExportFormatBase::SR_44_1, "44,1 kHz")));
 	add_sample_rate (SampleRatePtr (new SampleRateState (ExportFormatBase::SR_48, "48 kHz")));

libs/ardour/export_format_specification.cc

@@ -230,6 +230,8 @@ ExportFormatSpecification::ExportFormatSpecification (ExportFormatSpecification
 
 	set_silence_beginning (other.silence_beginning_time());
 	set_silence_end (other.silence_end_time());
+	
+	set_extension(other.extension());
 }
 
 ExportFormatSpecification::~ExportFormatSpecification ()
@@ -556,6 +558,9 @@ ExportFormatSpecification::description ()
 	  case SR_192:
 		desc += "192 kHz";
 		break;
+	  case SR_Session:
+		desc += _("Session rate");
+		break;
 	  case SR_None:
 		break;
 	}

libs/ardour/export_formats.cc

@@ -192,6 +192,7 @@ ExportFormatLinear::ExportFormatLinear (string name, FormatId format_id) :
 	add_sample_rate (SR_88_2);
 	add_sample_rate (SR_96);
 	add_sample_rate (SR_192);
+	add_sample_rate (SR_Session);
 
 	add_endianness (E_FileDefault);
 
@@ -262,6 +263,7 @@ ExportFormatOggVorbis::ExportFormatOggVorbis ()
 	add_sample_rate (SR_88_2);
 	add_sample_rate (SR_96);
 	add_sample_rate (SR_192);
+	add_sample_rate (SR_Session);
 
 	add_endianness (E_FileDefault);
 
@@ -301,6 +303,7 @@ ExportFormatFLAC::ExportFormatFLAC () :
 	add_sample_rate (SR_88_2);
 	add_sample_rate (SR_96);
 	add_sample_rate (SR_192);
+	add_sample_rate (SR_Session);
 
 	add_sample_format (SF_8);
 	add_sample_format (SF_16);
@@ -334,6 +337,7 @@ ExportFormatBWF::ExportFormatBWF () :
 	add_sample_rate (SR_88_2);
 	add_sample_rate (SR_96);
 	add_sample_rate (SR_192);
+	add_sample_rate (SR_Session);
 
 	add_sample_format (SF_U8);
 	add_sample_format (SF_16);

libs/ardour/export_graph_builder.cc

@@ -77,8 +77,18 @@ ExportGraphBuilder::reset ()
 void
 ExportGraphBuilder::add_config (FileSpec const & config)
 {
-	if (!config.channel_config->get_split ()) {
+	// If the sample rate is "session rate", change it to the real value.
-		add_split_config (config);
+	// However, we need to copy it to not change the config which is saved...
+	FileSpec new_config (config);
+	new_config.format.reset(new ExportFormatSpecification(*new_config.format));
+	if(new_config.format->sample_rate() == ExportFormatBase::SR_Session) {
+		framecnt_t session_rate = session.nominal_frame_rate();
+		new_config.format->set_sample_rate(ExportFormatBase::nearest_sample_rate(session_rate));
+	}
+	
+	
+	if (!new_config.channel_config->get_split ()) {
+		add_split_config (new_config);
 		return;
 	}
 	
@@ -86,11 +96,11 @@ ExportGraphBuilder::add_config (FileSpec const & config)
 	// each corresponding to a file, at this stage
 	typedef std::list<boost::shared_ptr<ExportChannelConfiguration> > ConfigList;
 	ConfigList file_configs;
-	config.channel_config->configurations_for_files (file_configs);
+	new_config.channel_config->configurations_for_files (file_configs);
 	
 	unsigned chan = 1;
 	for (ConfigList::iterator it = file_configs.begin(); it != file_configs.end(); ++it, ++chan) {
-		FileSpec copy = config;
+		FileSpec copy = new_config;
 		copy.channel_config = *it;
 		
 		copy.filename.reset (new ExportFilename (*copy.filename));