Add optional debug log thing for buffer over/underruns.

CMakeLists.txt

@@ -9,6 +9,7 @@ option(BUILD_EXAMPLES "Build the example applications" ON)
 option(BUILD_TESTER "Build the tester application" ON)
 option(BUILD_SIMD "Build with SIMD as minimum requirement" ON)
 option(BUILD_DOCS "Build the doxygen documentation files" ON)
+option(BUILD_DEBUG_LOG "Build with debug logging output" OFF)
 set(BUILD_SIMD_VERSION "SSE" CACHE STRING "Which SIMD version to require")
 
 ## Generate version
@@ -150,6 +151,9 @@ target_include_directories(mixed PRIVATE "src/" "libsamplerate/" "spiralfft/")
 set_property(TARGET mixed PROPERTY C_STANDARD 99)
 set_property(TARGET mixed PROPERTY POSITION_INDEPENDENT_CODE ON)
 target_compile_definitions(mixed PRIVATE MIXED_BUILD=1 MIXED_VERSION="${MIXED_VERSION_STRING}")
+if(BUILD_DEBUG_LOG)
+  target_compile_definitions(mixed PRIVATE MIXED_DEBUG=1)
+endif()
 target_compile_options(mixed PRIVATE ${COMPILATION_FLAGS} -W -Wall -Wextra -Wpedantic -Wno-ignored-attributes -Wno-enum-conversion)
 
 find_library(DL_LIB dl)

src/bip.h

@@ -27,6 +27,7 @@ static inline int bip_request_write(uint32_t *off, uint32_t *size, struct bip *b
     }else{ // Read has not done anything yet, no space!
       *size = 0;
       *off = 0;
+      debug_log("%p Overrun", buffer);
       return 0;
     }
   }else if(write < read){
@@ -38,6 +39,7 @@ static inline int bip_request_write(uint32_t *off, uint32_t *size, struct bip *b
   }else{
     *size = 0;
     *off = 0;
+    debug_log("%p Overrun", buffer);
     return 0;
   }
   return 1;
@@ -77,6 +79,7 @@ static inline int bip_request_read(uint32_t *off, uint32_t *size, struct bip *bu
     }else{ // Write has not done anything yet, no space!
       *size = 0;
       *off = 0;
+      debug_log("%p Underrun", buffer);
       return 0;
     }
   }else if(read < write){
@@ -85,6 +88,7 @@ static inline int bip_request_read(uint32_t *off, uint32_t *size, struct bip *bu
   }else{
     *size = 0;
     *off = 0;
+    debug_log("%p Underrun", buffer);
     return 0;
   }
   return 1;

src/internal.h

@@ -32,6 +32,12 @@
 #define IGNORE(...) __ignore(0, __VA_ARGS__)
 static inline void __ignore(char _, ...){(void)_;}
 
+#ifdef MIXED_DEBUG
+#define debug_log(...) {fprintf(stderr, "[libmixed] "); fprintf(stderr, __VA_ARGS__);}
+#else
+#define debug_log(...)
+#endif
+
 #if defined(__GNUC__) && !defined(__WIN32__)
 #if defined(__x86_64__)
 #define VECTORIZE __attribute__((target_clones("avx2","avx","sse4.1","default")))