ZamSFZ: Resample sfz samples when host samplerate mismatches sfz

3 files changed, 64 insertions, 9 deletions

diff --git a/plugins/ZamSFZ/Sfz.cpp b/plugins/ZamSFZ/Sfz.cpp
index eddc5fd..5630ae5 100644
--- a/plugins/ZamSFZ/Sfz.cpp
+++ b/plugins/ZamSFZ/Sfz.cpp
@@ -2,7 +2,6 @@
 #include <iostream>
 #include <fstream>
 #include <string>
-#define	BLOCK_SIZE 512
 
 void Sfz::remapvelocityranges(::sfz::Instrument *inst)
 {
@@ -95,8 +94,55 @@ void Sfz::remapvelocityranges(::sfz::Instrument *inst)
 	}
 }
 
-void Sfz::readsamples(SNDFILE *infile, 
-				int channels, int note, int layer)
+void Sfz::readsamples_resample(SNDFILE *infile, SF_INFO *sfinfo, int note, int layer, int target_rate)
+{
+	float buf[sfinfo->channels * BLOCK_SIZE];
+	float tmpbuf_pre[2][MAX_SAMPLES] = {0.f};
+	float tmpbuf_post[2][MAX_SAMPLES] = {0.f};
+	SRC_DATA src;
+	int k, m, readcount, i;
+	int maxch = std::min(sfinfo->channels, 2);
+
+	// Read samples in blocks to a flat buffer
+	i = 0;
+	while (i < MAX_SAMPLES && (readcount = sf_readf_float (infile, buf, BLOCK_SIZE)) > 0) {
+		for (k = 0 ; k < readcount ; k++) {
+			for (m = 0; m < maxch; m++) {
+				tmpbuf_pre[m][i+k] = buf[k*sfinfo->channels + m];
+			}
+		}
+		i += readcount;
+	}
+
+	// Resample...
+	src.data_in = &tmpbuf_pre[0][0];
+	src.data_out = &tmpbuf_post[0][0];
+	src.input_frames = MAX_SAMPLES;
+	src.output_frames = MAX_SAMPLES;
+	src.src_ratio = (double)target_rate / (double)sfinfo->samplerate;
+	if (!src_simple(&src, CONVERTER_TYPE, 1)) {
+		// Write left samples out to sample buffer
+		for (i = 0; i < src.output_frames_gen; i++) {
+			sample[note][layer][0][i] = tmpbuf_post[0][i];
+		}
+	}
+
+	if (maxch == 2) {
+		src.data_in = &tmpbuf_pre[1][0];
+		src.data_out = &tmpbuf_post[1][0];
+		src.input_frames = MAX_SAMPLES;
+		src.output_frames = MAX_SAMPLES;
+		src.src_ratio = (double)target_rate / (double)sfinfo->samplerate;
+		if (!src_simple(&src, CONVERTER_TYPE, 1)) {
+			// Write right samples out to sample buffer
+			for (i = 0; i < src.output_frames_gen; i++) {
+				sample[note][layer][1][i] = tmpbuf_post[1][i];
+			}
+		}
+	}
+}
+
+void Sfz::readsamples(SNDFILE *infile, int channels, int note, int layer)
 {
 	float buf[channels*BLOCK_SIZE];
 	int k, m, readcount, i;
@@ -104,7 +150,7 @@ void Sfz::readsamples(SNDFILE *infile,
 	i = 0;
 	while (i < MAX_SAMPLES && (readcount = sf_readf_float (infile, buf, BLOCK_SIZE)) > 0) {	
 		for (k = 0 ; k < readcount ; k++) {	
-			for (m = 0 ; m < channels ; m++) {
+			for (m = 0; m < std::min(channels, 2); m++) {
 				sample[note][layer][m][i+k] = buf[k*channels + m];
 			}
 		}
@@ -138,7 +184,7 @@ void Sfz::clearsamples()
 	}
 }
 
-void Sfz::loadsamples(std::string path, std::string filename)
+void Sfz::loadsamples(std::string path, std::string filename, int target_rate)
 {
 	int note, i, j, k, key;
 	::sfz::SFZParser sfzfile;
@@ -175,8 +221,12 @@ void Sfz::loadsamples(std::string path, std::string filename)
 						puts (sf_strerror (NULL));
 						printf("File: %s\n",fullsamplepath.c_str());
 				}
-				readsamples (infile, sfinfo.channels, note, layers[note].max);
 				k = layers[note].max;
+				if ((int)sfinfo.samplerate == target_rate) {
+					readsamples (infile, sfinfo.channels, note, k);
+				} else {
+					readsamples_resample (infile, &sfinfo, note, k, target_rate);
+				}
 				layers[note].l[k].lovel = sfzinstrument->regions[i]->lovel;
 				layers[note].l[k].hivel = sfzinstrument->regions[i]->hivel;
 				layers[note].l[k].lokey = sfzinstrument->regions[i]->lokey;
diff --git a/plugins/ZamSFZ/Sfz.hpp b/plugins/ZamSFZ/Sfz.hpp
index 5566495..3240310 100644
--- a/plugins/ZamSFZ/Sfz.hpp
+++ b/plugins/ZamSFZ/Sfz.hpp
@@ -5,9 +5,12 @@
 #include "libsfz/sfz.h"
 #include <rubberband/RubberBandStretcher.h>
 #include <sndfile.h>
+#include <samplerate.h>
 #include <math.h>
 #define MAX_LAYERS 12
 #define MAX_SAMPLES 130000
+#define	BLOCK_SIZE 512
+#define CONVERTER_TYPE SRC_SINC_BEST_QUALITY
 
 class Sfz {
 	
@@ -30,8 +33,9 @@ public:
 
 	layer_t layers[128];
 	void clearsamples();
-	void loadsamples(std::string path, std::string filename);
+	void loadsamples(std::string path, std::string filename, int target_rate);
 	void readsamples (SNDFILE *infile, int channels, int note, int layer);
+	void readsamples_resample (SNDFILE *infile, SF_INFO *sfinfo, int note, int layer, int target_rate);
 	void pitchshiftsamples(int srate);
 	void remapvelocityranges(::sfz::Instrument *inst);
 };
diff --git a/plugins/ZamSFZ/ZamSFZPlugin.cpp b/plugins/ZamSFZ/ZamSFZPlugin.cpp
index 1cd026c..16d12d5 100644
--- a/plugins/ZamSFZ/ZamSFZPlugin.cpp
+++ b/plugins/ZamSFZ/ZamSFZPlugin.cpp
@@ -98,6 +98,7 @@ void ZamSFZPlugin::setParameterValue(uint32_t index, float value)
 void ZamSFZPlugin::setState(const char* key, const char* value)
 {
 	if (strcmp(key, "filepath") == 0) {
+		int curr_srate = (int)getSampleRate();
 		char *tmp;
 		char file[1024] = {0};
 		snprintf(file, 1024, "%s", value);
@@ -107,8 +108,8 @@ void ZamSFZPlugin::setState(const char* key, const char* value)
 		loading = true;
 		printf("Path: %s\nFile: %s\n", path.c_str(), filename.c_str());
 		sfz.clearsamples();
-		sfz.loadsamples(path, filename);
-		sfz.pitchshiftsamples((int)getSampleRate());
+		sfz.loadsamples(path, filename, curr_srate);
+		sfz.pitchshiftsamples(curr_srate);
 		loading = false;
 	}
 }