diff options
Diffstat (limited to 'gr-audio/lib/oss/audio_oss_sink.cc')
| -rw-r--r-- | gr-audio/lib/oss/audio_oss_sink.cc | 161 |
1 files changed, 161 insertions, 0 deletions
diff --git a/gr-audio/lib/oss/audio_oss_sink.cc b/gr-audio/lib/oss/audio_oss_sink.cc new file mode 100644 index 000000000..4e9e7cd79 --- /dev/null +++ b/gr-audio/lib/oss/audio_oss_sink.cc @@ -0,0 +1,161 @@ +/* -*- c++ -*- */ +/* + * Copyright 2004-2011 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. + */ + +#ifdef HAVE_CONFIG_H +#include "config.h" +#endif + +#include "gr_audio_registry.h" +#include <audio_oss_sink.h> +#include <gr_io_signature.h> +#include <gr_prefs.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> + +AUDIO_REGISTER_SINK(REG_PRIO_LOW, oss)( + int sampling_rate, const std::string &device_name, bool ok_to_block +){ + return audio_sink::sptr(new audio_oss_sink(sampling_rate, device_name, ok_to_block)); +} + +static std::string +default_device_name () +{ + return gr_prefs::singleton()->get_string("audio_oss", "default_output_device", "/dev/dsp"); +} + +audio_oss_sink::audio_oss_sink (int sampling_rate, + const std::string device_name, + bool ok_to_block) + : audio_sink ("audio_oss_sink", + gr_make_io_signature (1, 2, sizeof (float)), + gr_make_io_signature (0, 0, 0)), + d_sampling_rate (sampling_rate), + d_device_name (device_name.empty() ? default_device_name() : device_name), + d_fd (-1), d_buffer (0), d_chunk_size (0) +{ + if ((d_fd = open (d_device_name.c_str (), O_WRONLY)) < 0){ + fprintf (stderr, "audio_oss_sink: "); + perror (d_device_name.c_str ()); + throw std::runtime_error ("audio_oss_sink"); + } + + double CHUNK_TIME = + std::max(0.001, gr_prefs::singleton()->get_double("audio_oss", "latency", 0.005)); + + d_chunk_size = (int) (d_sampling_rate * 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_oss_sink: " << d_device_name << " ioctl failed\n"; + perror (d_device_name.c_str ()); + throw std::runtime_error ("audio_oss_sink"); + } + + if (format != orig_format){ + fprintf (stderr, "audio_oss_sink: 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_oss_sink: could not set STEREO mode"); + throw std::runtime_error ("audio_oss_sink"); + } + + // set sampling freq + int sf = sampling_rate; + if (ioctl (d_fd, SNDCTL_DSP_SPEED, &sf) < 0){ + std::cerr << "audio_oss_sink: " + << d_device_name << ": invalid sampling_rate " + << sampling_rate << "\n"; + sampling_rate = 8000; + if (ioctl (d_fd, SNDCTL_DSP_SPEED, &sf) < 0){ + std::cerr << "audio_oss_sink: failed to set sampling_rate to 8000\n"; + throw std::runtime_error ("audio_oss_sink"); + } + } +} + +audio_oss_sink::~audio_oss_sink () +{ + close (d_fd); + delete [] d_buffer; +} + + +int +audio_oss_sink::work (int noutput_items, + gr_vector_const_void_star &input_items, + gr_vector_void_star &output_items) +{ + const float *f0, *f1; + + switch (input_items.size ()){ + + case 1: // mono input + + f0 = (const float *) input_items[0]; + + for (int i = 0; i < noutput_items; i += d_chunk_size){ + for (int j = 0; j < d_chunk_size; j++){ + d_buffer[2*j+0] = (short) (f0[j] * 32767); + d_buffer[2*j+1] = (short) (f0[j] * 32767); + } + f0 += d_chunk_size; + if (write (d_fd, d_buffer, 2 * d_chunk_size * sizeof (short)) < 0) + perror ("audio_oss_sink: write"); + } + break; + + case 2: // stereo input + + f0 = (const float *) input_items[0]; + f1 = (const float *) input_items[1]; + + for (int i = 0; i < noutput_items; i += d_chunk_size){ + for (int j = 0; j < d_chunk_size; j++){ + d_buffer[2*j+0] = (short) (f0[j] * 32767); + d_buffer[2*j+1] = (short) (f1[j] * 32767); + } + f0 += d_chunk_size; + f1 += d_chunk_size; + if (write (d_fd, d_buffer, 2 * d_chunk_size * sizeof (short)) < 0) + perror ("audio_oss_sink: write"); + } + break; + } + + return noutput_items; +} |