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Diffstat (limited to 'gr-audio/lib/windows/windows_source.cc')
| -rw-r--r-- | gr-audio/lib/windows/windows_source.cc | 194 |
1 files changed, 194 insertions, 0 deletions
diff --git a/gr-audio/lib/windows/windows_source.cc b/gr-audio/lib/windows/windows_source.cc new file mode 100644 index 0000000000..89371cfa84 --- /dev/null +++ b/gr-audio/lib/windows/windows_source.cc @@ -0,0 +1,194 @@ +/* -*- c++ -*- */ +/* + * Copyright 2004-2011,2013 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. + */ + +#ifdef HAVE_CONFIG_H +#include "config.h" +#endif + +#include "audio_registry.h" +#include <windows_source.h> +#include <gr_io_signature.h> +//include <sys/soundcard.h> +//include <sys/ioctl.h> +#include <sys/types.h> +#include <sys/stat.h> +#include <fcntl.h> +#include <unistd.h> +#include <stdio.h> +#include <iostream> +#include <stdexcept> + +namespace gr { + namespace audio { + + AUDIO_REGISTER_SOURCE(REG_PRIO_HIGH, windows)(int sampling_rate, + const std::string &device_name, + bool) + { + return source::sptr + (new windows_source(sampling_rate, device_name)); + } + + static const double CHUNK_TIME = 0.005; // 5 ms + + // FIXME these should query some kind of user preference + + static std::string + default_device_name() + { + return "/dev/dsp"; + } + + windows_source::windows_source(int sampling_freq, + const std::string device_name) + : gr_sync_block("audio_windows_source", + gr_make_io_signature(0, 0, 0), + gr_make_io_signature(1, 2, sizeof(float))), + d_sampling_freq(sampling_freq), + d_device_name(device_name.empty() ? default_device_name() : device_name), + d_fd(-1), d_buffer(0), d_chunk_size(0) + { + //FIXME TODO implement me +#if 0 + if((d_fd = open(d_device_name.c_str(), O_RDONLY)) < 0) { + fprintf(stderr, "audio_windows_source: "); + perror(d_device_name.c_str()); + throw std::runtime_error("audio_windows_source"); + } + + d_chunk_size = (int)(d_sampling_freq * CHUNK_TIME); + set_output_multiple(d_chunk_size); + + d_buffer = new short[d_chunk_size * 2]; + + int format = AFMT_S16_NE; + int orig_format = format; + if(ioctl(d_fd, SNDCTL_DSP_SETFMT, &format) < 0) { + std::cerr << "audio_windows_source: " << d_device_name + << " ioctl failed\n"; + perror(d_device_name.c_str()); + throw std::runtime_error("audio_windows_source"); + } + + if(format != orig_format) { + fprintf(stderr, "audio_windows_source: unable to support format %d\n", + orig_format); + fprintf(stderr, " card requested %d instead.\n", format); + } + + // set to stereo no matter what. Some hardware only does stereo + int channels = 2; + if(ioctl(d_fd, SNDCTL_DSP_CHANNELS, &channels) < 0 || channels != 2) { + perror("audio_windows_source: could not set STEREO mode"); + throw std::runtime_error("audio_windows_source"); + } + + // set sampling freq + int sf = sampling_freq; + if(ioctl(d_fd, SNDCTL_DSP_SPEED, &sf) < 0) { + std::cerr << "audio_windows_source: " + << d_device_name << ": invalid sampling_freq " + << sampling_freq << "\n"; + sampling_freq = 8000; + if(ioctl(d_fd, SNDCTL_DSP_SPEED, &sf) < 0) { + std::cerr << "audio_windows_source: failed to set sampling_freq to 8000\n"; + throw std::runtime_error ("audio_windows_source"); + } + } +#endif + } + + windows_source::~windows_source() + { + /*close(d_fd); + delete [] d_buffer; + */ + } + + int + windows_source::work(int noutput_items, + gr_vector_const_void_star & input_items, + gr_vector_void_star & output_items) + { + //FIXME TODO implement me +#if 0 + float *f0 = (float*)output_items[0]; + float *f1 = (float*)output_items[1]; // will be invalid if this is mono output + + const int shorts_per_item = 2; // L + R + const int bytes_per_item = shorts_per_item * sizeof(short); + + // To minimize latency, never return more than CHUNK_TIME + // worth of samples per call to work. + // FIXME, we need an API to set this value + + noutput_items = std::min(noutput_items, d_chunk_size); + + int base = 0; + int ntogo = noutput_items; + + while(ntogo > 0) { + int nbytes = std::min(ntogo, d_chunk_size) * bytes_per_item; + int result_nbytes = read(d_fd, d_buffer, nbytes); + + if(result_nbytes < 0) { + perror("audio_windows_source"); + return -1; // say we're done + } + + if((result_nbytes & (bytes_per_item - 1)) != 0) { + fprintf(stderr, "audio_windows_source: internal error.\n"); + throw std::runtime_error("internal error"); + } + + int result_nitems = result_nbytes / bytes_per_item; + + // now unpack samples into output streams + switch(output_items.size()) { + case 1: // mono output + for(int i = 0; i < result_nitems; i++) { + f0[base + i] = d_buffer[2 * i + 0] * (1.0 / 32767); + } + break; + + case 2: // stereo output + for(int i = 0; i < result_nitems; i++) { + f0[base + i] = d_buffer[2 * i + 0] * (1.0 / 32767); + f1[base + i] = d_buffer[2 * i + 1] * (1.0 / 32767); + } + break; + + default: + assert(0); + } + + ntogo -= result_nitems; + base += result_nitems; + } + + return noutput_items - ntogo; +#endif + return -1; // EOF + } + + } /* namespace audio */ +} /* namespace gr */ |