Switch to cmake for building.

CMakeLists.txt

@@ -0,0 +1,57 @@
+# CMake definitions for SoftFM
+
+cmake_minimum_required(VERSION 2.4)
+project(SoftFM)
+
+find_package(PkgConfig)
+find_package(ALSA REQUIRED)
+
+# Find RTL-SDR library (for linking).
+pkg_check_modules(PKG_RTLSDR librtlsdr)
+find_path(RTLSDR_INCLUDE_DIR rtl-sdr.h
+          HINT ${PKG_RTLSDR_INCLUDE_DIRS})
+find_library(RTLSDR_LIBRARY librtlsdr.a
+             HINT ${PKG_RTLSDR_LIBRARY_DIRS})
+
+# Find libusb
+pkg_check_modules(PKG_LIBUSB libusb-1.0)
+find_path(LIBUSB_INCLUDE_DIR libusb.h
+          HINT ${PKG_LIBUSB_INCLUDE_DIRS}
+          PATH_SUFFIXES libusb-1.0)
+find_library(LIBUSB_LIBRARY usb-1.0
+             HINT ${PKG_LIBUSB_LIBRARY_DIRS})
+
+if(RTLSDR_INCLUDE_DIR AND RTLSDR_LIBRARY)
+    message(STATUS "Found librtlsdr: ${RTLSDR_INCLUDE_DIR}, ${RTLSDR_LIBRARY}")
+else()
+    message(WARNING "Can not find Osmocom RTL-SDR library")
+    message("Try again with environment variable PKG_CONFIG_PATH")
+    message("or with -DRTLSDR_INCLUDE_DIR=/path/rtlsdr/include")
+    message("        -DRTLSDR_LIBRARY=/path/rtlsdr/lib/librtlsdr.a")
+endif()
+
+set(RTLSDR_INCLUDE_DIRS ${RTLSDR_INCLUDE_DIR} ${LIBUSB_INCLUDE_DIR})
+set(RTLSDR_LIBRARIES    ${RTLSDR_LIBRARY} ${LIBUSB_LIBRARY})
+
+# Compiler flags.
+set(CMAKE_CXX_FLAGS "-Wall -std=c++11 -O2 -ffast-math -ftree-vectorize ${EXTRA_FLAGS}")
+
+add_executable(softfm
+    main.cc
+    RtlSdrSource.cc
+    Filter.cc
+    FmDecode.cc
+    AudioOutput.cc )
+
+include_directories(
+    ${RTLSDR_INCLUDE_DIRS}
+    ${ALSA_INCLUDE_DIRS}
+    ${EXTRA_INCLUDES} )
+
+target_link_libraries(softfm
+    ${RTLSDR_LIBRARIES}
+    ${ALSA_LIBRARIES}
+    ${EXTRA_LIBS} )
+
+install(TARGETS softfm DESTINATION bin)
+

Makefile

@@ -1,41 +0,0 @@
-# Makefile for SoftFM
-
-# ----- Tweak these settings to configure for your system
-
-CROSS         =
-CFLAGS_OPT    = -O2 -ffast-math -ftree-vectorize
-CFLAGS_DEBUG  = -g
-CFLAGS_ARCH   =
-CFLAGS_PATH   = -I/home/joris/test/rtl-sdr/inst/include
-CFLAGS_EXTRA  =
-LDFLAGS_PATH  = -L/home/joris/test/rtl-sdr/inst/lib
-LDFLAGS_EXTRA =
-LIBS_ALSA     = -lasound
-LIBS_RTLSDR   = /home/joris/test/rtl-sdr/inst/lib/librtlsdr.a -lusb-1.0
-LIBS_EXTRA    =
-
-# ----- end tweakable settings
-
-
-CXX = $(CROSS)g++
-CXXFLAGS = -std=c++11 -Wall -D_FILE_OFFSET_BITS=64 \
-           $(CFLAGS_OPT) $(CFLAGS_DEBUG) \
-           $(CFLAGS_ARCH) $(CFLAGS_PATH) $(CFLAGS_EXTRA)
-LDFLAGS = $(LDFLAGS_PATH) $(LDFLAGS_EXTRA)
-LDLIBS  = $(LIBS_ALSA) $(LIBS_RTLSDR) $(LIBS_EXTRA)
-
-OBJS	= RtlSdrSource.o Filter.o FmDecode.o AudioOutput.o main.o
-
-softfm         : $(OBJS)
-	$(CXX) $(LDFLAGS) -o $@ $(OBJS) $(LDLIBS)
-
-RtlSdrSource.o : RtlSdrSource.cc RtlSdrSource.h SoftFM.h
-Filter.o       : Filter.cc Filter.h SoftFM.h
-FmDecode.o     : FmDecode.cc FmDecode.h SoftFM.h Filter.h
-AudioOutput.o  : AudioOutput.cc AudioOutput.h SoftFM.h
-main.o         : main.cc SoftFM.h RtlSdrSource.h Filter.h FmDecode.h AudioOutput.h
-
-.PHONY: clean
-clean:
-	$(RM) softfm *.o
-

TODO.txt

@@ -0,0 +1,10 @@
+* write README.txt
+* push to github
+* implement WAV file writing
+* implement stereo pilot PPS
+* implement RDS decoding
+* figure out why we sometimes lose stereo lock
+* investigate problem at low IF sample rates; apparently librtlsdr is not telling the truth about the actual sample rate.
+* look at I/Q balance to improve weak stations
+* look at hardware gain settings to improve weak stations
+* consider FM demodulation with PLL instead of phase discriminator