From 7df5b10ddcd64309a5c299f662a4cd62a7d175ab Mon Sep 17 00:00:00 2001 From: Johnathan Corgan Date: Mon, 14 Mar 2011 15:20:19 -0700 Subject: gnuradio-examples: add C++ audio examples using new gr-audio * gnuradio-examples/C++/audio/dial_tone --- gnuradio-examples/c++/audio/.gitignore | 3 ++ gnuradio-examples/c++/audio/Makefile.am | 38 ++++++++++++++++ gnuradio-examples/c++/audio/dial_tone.cc | 78 ++++++++++++++++++++++++++++++++ 3 files changed, 119 insertions(+) create mode 100644 gnuradio-examples/c++/audio/.gitignore create mode 100644 gnuradio-examples/c++/audio/Makefile.am create mode 100644 gnuradio-examples/c++/audio/dial_tone.cc (limited to 'gnuradio-examples/c++/audio') diff --git a/gnuradio-examples/c++/audio/.gitignore b/gnuradio-examples/c++/audio/.gitignore new file mode 100644 index 000000000..bb08aaf91 --- /dev/null +++ b/gnuradio-examples/c++/audio/.gitignore @@ -0,0 +1,3 @@ +/Makefile +/Makefile.in +/dial_tone diff --git a/gnuradio-examples/c++/audio/Makefile.am b/gnuradio-examples/c++/audio/Makefile.am new file mode 100644 index 000000000..88bd7c1fd --- /dev/null +++ b/gnuradio-examples/c++/audio/Makefile.am @@ -0,0 +1,38 @@ +# +# Copyright 2011 Free Software Foundation, Inc. +# +# This file is part of GNU Radio +# +# GNU Radio is free software; you can redistribute it and/or modify +# it under the terms of the GNU General Public License as published by +# the Free Software Foundation; either version 3, or (at your option) +# any later version. +# +# GNU Radio is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with GNU Radio; see the file COPYING. If not, write to +# the Free Software Foundation, Inc., 51 Franklin Street, +# Boston, MA 02110-1301, USA. +# + +include $(top_srcdir)/Makefile.common + +# For compiling with the GNU Radio build tree, use include dir below. +# For compiling outside the tree, use 'pkg-config --cflags gnuradio-audio' +AM_CPPFLAGS = \ + -I$(top_srcdir)/gr-audio/include \ + $(STD_DEFINES_AND_INCLUDES) \ + $(WITH_INCLUDES) + +# For compiling within the GNU Radio build tree, link against GR_AUDIO_LA +# For compiling outside the tree, use 'pkg-config --libs gnuradio-audio' +GR_AUDIO_LA=$(top_builddir)/gr-audio/lib/libgnuradio-audio.la + +noinst_PROGRAMS = dial_tone + +dial_tone_SOURCES = dial_tone.cc +dial_tone_LDADD = $(GNURADIO_CORE_LA) $(GR_AUDIO_LA) diff --git a/gnuradio-examples/c++/audio/dial_tone.cc b/gnuradio-examples/c++/audio/dial_tone.cc new file mode 100644 index 000000000..e4e3d8ceb --- /dev/null +++ b/gnuradio-examples/c++/audio/dial_tone.cc @@ -0,0 +1,78 @@ +/* + * Copyright 2011 Free Software Foundation, Inc. + * + * This file is part of GNU Radio + * + * GNU Radio is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 3, or (at your option) + * any later version. + * + * GNU Radio is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with GNU Radio; see the file COPYING. If not, write to + * the Free Software Foundation, Inc., 51 Franklin Street, + * Boston, MA 02110-1301, USA. + */ + + +/* + * GNU Radio C++ example creating dial tone + * ("the simplest thing that could possibly work") + * + * Send a tone each to the left and right channels of stereo audio + * output and let the user's brain sum them. + * + * GNU Radio makes extensive use of Boost shared pointers. Signal processing + * blocks are typically created by calling a "make" factory function, which + * returns an instance of the block as a typedef'd shared pointer that can + * be used in any way a regular pointer can. Shared pointers created this way + * keep track of their memory and free it at the right time, so the user + * doesn't need to worry about it (really). + * + */ + +// Include header files for each block used in flowgraph +#include +#include +#include + +int main(int argc, char **argv) +{ + int rate = 48000; // Audio card sample rate + float ampl = 0.1; // Don't exceed 0.5 or clipping will occur + + // Construct a top block that will contain flowgraph blocks. Alternatively, + // one may create a derived class from gr_top_block and hold instantiated blocks + // as member data for later manipulation. + gr_top_block_sptr tb = gr_make_top_block("dial_tone"); + + // Construct a real-valued signal source for each tone, at given sample rate + gr_sig_source_f_sptr src0 = gr_make_sig_source_f(rate, GR_SIN_WAVE, 350, ampl); + gr_sig_source_f_sptr src1 = gr_make_sig_source_f(rate, GR_SIN_WAVE, 440, ampl); + + // Construct an audio sink to accept audio tones + audio_sink::sptr sink = audio_make_sink(rate); + + // Connect output #0 of src0 to input #0 of sink (left channel) + tb->connect(src0, 0, sink, 0); + + // Connect output #0 of src1 to input #1 of sink (right channel) + tb->connect(src1, 0, sink, 1); + + // Tell GNU Radio runtime to start flowgraph threads; the foreground thread + // will block until either flowgraph exits (this example doesn't) or the + // application receives SIGINT (e.g., user hits CTRL-C). + // + // Real applications may use tb->start() which returns, allowing the foreground + // thread to proceed, then later use tb->stop(), followed by tb->wait(), to cleanup + // GNU Radio before exiting. + tb->run(); + + // Exit normally. + return 0; +} -- cgit