preliminary audio file output

.gitmodules

@@ -9,3 +9,7 @@
 	path = extern/Nuked-OPM
 	url = https://github.com/nukeykt/Nuked-OPM
 	branch = main
+[submodule "extern/libsndfile"]
+	path = extern/libsndfile
+	url = https://github.com/libsndfile/libsndfile.git
+	branch = master

CMakeLists.txt

@@ -3,6 +3,9 @@ project(furnace)
 
 set(CMAKE_CXX_STANDARD 11)
 
+set(BUILD_TESTING OFF)
+add_subdirectory(extern/libsndfile)
+
 if (WIN32)
   set(SDL_SHARED OFF)
   add_subdirectory(extern/SDL)
@@ -16,6 +19,7 @@ else()
     find_library(HAVE_JACK jack)
   endif()
   find_library(HAVE_Z z)
+  find_library(HAVE_SNDFILE sndfile)
 endif()
 
 set(AUDIO_SOURCES src/audio/abstract.cpp)
@@ -82,7 +86,7 @@ src/engine/platform/dummy.cpp)
 add_executable(furnace ${ENGINE_SOURCES} ${AUDIO_SOURCES}
 src/main.cpp)
 
-target_link_libraries(furnace ${HAVE_SDL2} ${HAVE_Z})
+target_link_libraries(furnace ${HAVE_SDL2} ${HAVE_Z} sndfile)
 
 if (HAVE_JACK)
   target_link_libraries(furnace ${HAVE_JACK})

extern/libsndfile

@@ -0,0 +1 @@
+Subproject commit ca2008903f66f856de4cd86e83a387b56260d5b7

src/engine/engine.cpp

@@ -15,6 +15,7 @@
 #include "platform/dummy.h"
 #include <math.h>
 #include <zlib.h>
+#include <sndfile.h>
 
 void process(void* u, float** in, float** out, int inChans, int outChans, unsigned int size) {
   ((DivEngine*)u)->nextBuf(in,out,inChans,outChans,size);
@@ -695,10 +696,22 @@ void DivEngine::setView(DivStatusView which) {
 }
 
 bool DivEngine::init(String outName) {
+  SNDFILE* outFile;
+  SF_INFO outInfo;
   if (outName!="") {
     // init out file
     got.bufsize=2048;
     got.rate=44100;
+
+    outInfo.samplerate=got.rate;
+    outInfo.channels=1;
+    outInfo.format=SF_FORMAT_WAV|SF_FORMAT_PCM_16;
+
+    outFile=sf_open(outName.c_str(),SFM_WRITE,&outInfo);
+    if (outFile==NULL) {
+      logE("could not open file for writing!\n");
+      return false;
+    }
   } else {
     switch (audioEngine) {
       case DIV_AUDIO_JACK:
@@ -800,6 +813,13 @@ bool DivEngine::init(String outName) {
 
   if (outName!="") {
     // render to file
+    remainingLoops=1;
+    while (remainingLoops) {
+      nextBuf(NULL,NULL,0,2,got.bufsize);
+      sf_writef_short(outFile,bbOut[0],got.bufsize);
+    }
+    sf_close(outFile);
+    return true;
   } else {
     if (!output->setRun(true)) {
       logE("error while activating!\n");

src/engine/playback.cpp

@@ -1,6 +1,7 @@
 #include "dispatch.h"
 #include "engine.h"
 #include "../ta-log.h"
+#include <sndfile.h>
 
 void DivEngine::nextOrder() {
   curRow=0;
@@ -716,6 +717,8 @@ void DivEngine::nextBuf(float** in, float** out, int inChans, int outChans, unsi
     blip_read_samples(bb[1],bbOut[1],size,0);
   }
 
+  if (out==NULL) return;
+
   if (dispatch->isStereo()) {
     for (size_t i=0; i<size; i++) {
       out[0][i]=(float)bbOut[0][i]/16384.0;

src/main.cpp

@@ -15,6 +15,8 @@
 
 DivEngine e;
 
+String outName;
+
 std::vector<TAParam> params;
 
 bool pHelp(String) {
@@ -116,7 +118,8 @@ bool pLoops(String val) {
 }
 
 bool pOutput(String val) {
-  return false;
+  outName=val;
+  return true;
 }
 
 bool needsValue(String param) {
@@ -143,6 +146,7 @@ void initParams() {
 }
 
 int main(int argc, char** argv) {
+  outName="";
 #ifdef _WIN32
   HANDLE winin=GetStdHandle(STD_INPUT_HANDLE);
   HANDLE winout=GetStdHandle(STD_OUTPUT_HANDLE);
@@ -244,11 +248,11 @@ int main(int argc, char** argv) {
     logE("could not open file!\n");
     return 1;
   }
-  if (!e.init()) {
+  if (!e.init(outName)) {
     logE("could not initialize engine!\n");
     return 1;
   }
-  logI("loaded! :o\n");
+  if (outName!="") return 0;
   logI("playing...\n");
   e.play();
   while (true) {