From a64df4e322933006f954c72bccbe53f6ce1a2381 Mon Sep 17 00:00:00 2001
From: Tom Rondeau <trondeau@vt.edu>
Date: Mon, 11 Feb 2013 23:12:08 -0500
Subject: analog: wip: name changes for alsa, oss, jack files.
---
gr-audio/lib/oss/oss_source.cc | 186 +++++++++++++++++++++++++++++++++++++++++
1 file changed, 186 insertions(+)
create mode 100644 gr-audio/lib/oss/oss_source.cc
(limited to 'gr-audio/lib/oss/oss_source.cc')
diff --git a/gr-audio/lib/oss/oss_source.cc b/gr-audio/lib/oss/oss_source.cc
new file mode 100644
index 0000000000..6d6bafceb8
--- /dev/null
+++ b/gr-audio/lib/oss/oss_source.cc
@@ -0,0 +1,186 @@
+/* -*- 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 <oss_source.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>
+
+namespace gr {
+ namespace audio {
+
+ AUDIO_REGISTER_SOURCE(REG_PRIO_LOW, oss)(int sampling_rate,
+ const std::string &device_name,
+ bool ok_to_block)
+ {
+ return source::sptr
+ (new oss_source(sampling_rate, device_name, ok_to_block));
+ }
+
+ static std::string
+ default_device_name()
+ {
+ return gr_prefs::singleton()->get_string
+ ("audio_oss", "default_input_device", "/dev/dsp");
+ }
+
+ oss_source::oss_source(int sampling_rate,
+ const std::string device_name,
+ bool ok_to_block)
+ : gr_sync_block("audio_oss_source",
+ gr_make_io_signature(0, 0, 0),
+ gr_make_io_signature(1, 2, sizeof(float))),
+ 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_RDONLY)) < 0) {
+ fprintf(stderr, "audio_oss_source: ");
+ perror(d_device_name.c_str());
+ throw std::runtime_error("audio_oss_source");
+ }
+
+ 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_source: " << d_device_name << " ioctl failed\n";
+ perror(d_device_name.c_str ());
+ throw std::runtime_error("audio_oss_source");
+ }
+
+ if(format != orig_format) {
+ fprintf(stderr, "audio_oss_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_oss_source: could not set STEREO mode");
+ throw std::runtime_error("audio_oss_source");
+ }
+
+ // set sampling freq
+ int sf = sampling_rate;
+ if(ioctl(d_fd, SNDCTL_DSP_SPEED, &sf) < 0) {
+ std::cerr << "audio_oss_source: "
+ << 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_source: failed to set sampling_rate to 8000\n";
+ throw std::runtime_error ("audio_oss_source");
+ }
+ }
+ }
+
+ oss_source::~oss_source()
+ {
+ close(d_fd);
+ delete [] d_buffer;
+ }
+
+ int
+ oss_source::work(int noutput_items,
+ gr_vector_const_void_star &input_items,
+ gr_vector_void_star &output_items)
+ {
+ 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.
+
+ 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_oss_source");
+ return -1; // say we're done
+ }
+
+ if((result_nbytes & (bytes_per_item - 1)) != 0) {
+ fprintf(stderr, "audio_oss_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;
+ }
+
+ } /* namespace audio */
+} /* namespace gr */
--
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