For my hardware project Die Brummbeere I started to work with buildroot a lot. For sound visualization in Die Brummbeere I wanted to use the sonotopy library, and use my existing buildroot toolchain to compile it for the Raspberry. Unfortunately, it didn’t work out of the box. First, it was not quite clear how to build scons for the host, but a quick search for scons and buildroot led me to:
$ make host-scons
After that I started to create my own package for sonotopy based on the information in the buildroot documentation. I added a Config.in and sonotopy.mk file that I copied from another scons-based package in buildroot (benejson) and modified them, but without luck. My Config.in contains:
config BR2_PACKAGE_SONOTOPY
bool "sonotopy"
select HOST_SCONS
depeds on BR2_PACKAGE_FFTW
help
Sonotopy is a C++ library for perceptually analyzing the contents of
an acoustic signal in real time.
https://github.com/alex-berman/sonotopy
My sonotopy.mk is:
################################################################################
#
# sonotopy
#
################################################################################
SONOTOPY_VERSION = master
SONOTOPY_SOURCE = master.tar.gz
SONOTOPY_SITE = https://github.com/pbouda/sonotopy/archive/
SONOTOPY_LICENSE = GPLv3+
SONOTOPY_LICENSE_FILES = LICENSE
SONOTOPY_INSTALL_STAGING = YES
SONOTOPY_DEPENDENCIES = host-scons
define SONOTOPY_BUILD_CMDS
(cd $(@D); \
$(TARGET_CONFIGURE_OPTS) CROSS=$(TARGET_CROSS) \
$(SCONS))
endef
define SONOTOPY_INSTALL_STATIC_LIB
$(INSTALL) -D -m 0644 $(@D)/include/sonotopy/sonotopy.hpp \
$(STAGING_DIR)/usr/include/sonotopy/sonotopy.hpp; \
$(INSTALL) -D -m 0644 $(@D)/include/sonotopy/AudioParameters.hpp \
$(STAGING_DIR)/usr/include/sonotopy/AudioParameters.hpp; \
$(INSTALL) -D -m 0644 $(@D)/include/sonotopy/BeatTracker.hpp \
$(STAGING_DIR)/usr/include/sonotopy/BeatTracker.hpp; \
$(INSTALL) -D -m 0644 $(@D)/include/sonotopy/CircleMap.hpp \
$(STAGING_DIR)/usr/include/sonotopy/CircleMap.hpp; \
$(INSTALL) -D -m 0644 $(@D)/include/sonotopy/CircleMapParameters.hpp \
$(STAGING_DIR)/usr/include/sonotopy/CircleMapParameters.hpp; \
$(INSTALL) -D -m 0644 $(@D)/include/sonotopy/CircleTopology.hpp \
$(STAGING_DIR)/usr/include/sonotopy/CircleTopology.hpp; \
$(INSTALL) -D -m 0644 $(@D)/include/sonotopy/CircularBuffer.hpp \
$(STAGING_DIR)/usr/include/sonotopy/CircularBuffer.hpp; \
$(INSTALL) -D -m 0644 $(@D)/include/sonotopy/DisjointGridMap.hpp \
$(STAGING_DIR)/usr/include/sonotopy/DisjointGridMap.hpp; \
$(INSTALL) -D -m 0644 $(@D)/include/sonotopy/DisjointGridTopology.hpp \
$(STAGING_DIR)/usr/include/sonotopy/DisjointGridTopology.hpp; \
$(INSTALL) -D -m 0644 $(@D)/include/sonotopy/EventDetector.hpp \
$(STAGING_DIR)/usr/include/sonotopy/EventDetector.hpp; \
$(INSTALL) -D -m 0644 $(@D)/include/sonotopy/GridMap.hpp \
$(STAGING_DIR)/usr/include/sonotopy/GridMap.hpp; \
$(INSTALL) -D -m 0644 $(@D)/include/sonotopy/GridMapParameters.hpp \
$(STAGING_DIR)/usr/include/sonotopy/GridMapParameters.hpp; \
$(INSTALL) -D -m 0644 $(@D)/include/sonotopy/Normalizer.hpp \
$(STAGING_DIR)/usr/include/sonotopy/Normalizer.hpp; \
$(INSTALL) -D -m 0644 $(@D)/include/sonotopy/Random.hpp \
$(STAGING_DIR)/usr/include/sonotopy/Random.hpp; \
$(INSTALL) -D -m 0644 $(@D)/include/sonotopy/RectGridTopology.hpp \
$(STAGING_DIR)/usr/include/sonotopy/RectGridTopology.hpp; \
$(INSTALL) -D -m 0644 $(@D)/include/sonotopy/Smoother.hpp \
$(STAGING_DIR)/usr/include/sonotopy/Smoother.hpp; \
$(INSTALL) -D -m 0644 $(@D)/include/sonotopy/SOM.hpp \
$(STAGING_DIR)/usr/include/sonotopy/SOM.hpp; \
$(INSTALL) -D -m 0644 $(@D)/include/sonotopy/SpectrumAnalyzer.hpp \
$(STAGING_DIR)/usr/include/sonotopy/SpectrumAnalyzer.hpp; \
$(INSTALL) -D -m 0644 $(@D)/include/sonotopy/SpectrumAnalyzerParameters.hpp \
$(STAGING_DIR)/usr/include/sonotopy/SpectrumAnalyzerParameters.hpp; \
$(INSTALL) -D -m 0644 $(@D)/include/sonotopy/SpectrumBinDivider.hpp \
$(STAGING_DIR)/usr/include/sonotopy/SpectrumBinDivider.hpp; \
$(INSTALL) -D -m 0644 $(@D)/include/sonotopy/SpectrumMap.hpp \
$(STAGING_DIR)/usr/include/sonotopy/SpectrumMap.hpp; \
$(INSTALL) -D -m 0644 $(@D)/include/sonotopy/SpectrumMapParameters.hpp \
$(STAGING_DIR)/usr/include/sonotopy/SpectrumMapParameters.hpp; \
$(INSTALL) -D -m 0644 $(@D)/include/sonotopy/Stopwatch.hpp \
$(STAGING_DIR)/usr/include/sonotopy/Stopwatch.hpp; \
$(INSTALL) -D -m 0644 $(@D)/include/sonotopy/Topology.hpp \
$(STAGING_DIR)/usr/include/sonotopy/Topology.hpp; \
$(INSTALL) -D -m 0644 $(@D)/include/sonotopy/TwoDimArray.hpp \
$(STAGING_DIR)/usr/include/sonotopy/TwoDimArray.hpp
$(INSTALL) -D -m 0644 $(@D)/build/release/src/libsonotopy.a \
$(1)/usr/lib/libsonotopy.a
endef
define SONOTOPY_INSTALL_STAGING_CMDS
$(call SONOTOPY_INSTALL_STATIC_LIB,$(STAGING_DIR))
endef
$(eval $(generic-package))
The package compiles fine, but the architecture of resulting binary file is that of my host, and not of my target (the Raspberry). Luckily, I got some help on the buildroot IRC channel. I had to still modify sonotopy’s SConstruct file, so that it uses the CROSS environment variable to set the correct compiler and linker variables:
if 'CROSS' in os.environ:
cross = os.environ['CROSS']
env.Append(CROSS = cross)
env.Replace(CC = cross + 'gcc')
env.Replace(CXX = cross + 'g++')
env.Replace(LD = cross + 'ld')
Now sonotopy compiled fine and I could use it in my projects on the Raspberry. To try it out you may just use my own fork of sonotopy on GitHub:
https://github.com/pbouda/sonotopy
Sonotopy comes with a few examples with requirements that I didn’t want to compile for my project. I already have Qt with audio input and output, so I build a little Qt project to visualize the GridMap calculations of sonotopy in a QML view. The project is called Sonobeere, the current tree with the GridMap example is on GitHub:
https://github.com/pbouda/sonobeere/tree/5a6efd0275cea9f4dd1c3920def19766663b0f8f
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