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<h1>src/libsphinxad/ad_oss.c</h1> </div>
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<div class="contents">
<div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/* -*- c-basic-offset: 4; indent-tabs-mode: nil -*- */</span>
<a name="l00002"></a>00002 <span class="comment">/* ====================================================================</span>
<a name="l00003"></a>00003 <span class="comment"> * Copyright (c) 1999-2001 Carnegie Mellon University. All rights</span>
<a name="l00004"></a>00004 <span class="comment"> * reserved.</span>
<a name="l00005"></a>00005 <span class="comment"> *</span>
<a name="l00006"></a>00006 <span class="comment"> * Redistribution and use in source and binary forms, with or without</span>
<a name="l00007"></a>00007 <span class="comment"> * modification, are permitted provided that the following conditions</span>
<a name="l00008"></a>00008 <span class="comment"> * are met:</span>
<a name="l00009"></a>00009 <span class="comment"> *</span>
<a name="l00010"></a>00010 <span class="comment"> * 1. Redistributions of source code must retain the above copyright</span>
<a name="l00011"></a>00011 <span class="comment"> * notice, this list of conditions and the following disclaimer. </span>
<a name="l00012"></a>00012 <span class="comment"> *</span>
<a name="l00013"></a>00013 <span class="comment"> * 2. Redistributions in binary form must reproduce the above copyright</span>
<a name="l00014"></a>00014 <span class="comment"> * notice, this list of conditions and the following disclaimer in</span>
<a name="l00015"></a>00015 <span class="comment"> * the documentation and/or other materials provided with the</span>
<a name="l00016"></a>00016 <span class="comment"> * distribution.</span>
<a name="l00017"></a>00017 <span class="comment"> *</span>
<a name="l00018"></a>00018 <span class="comment"> * This work was supported in part by funding from the Defense Advanced </span>
<a name="l00019"></a>00019 <span class="comment"> * Research Projects Agency and the National Science Foundation of the </span>
<a name="l00020"></a>00020 <span class="comment"> * United States of America, and the CMU Sphinx Speech Consortium.</span>
<a name="l00021"></a>00021 <span class="comment"> *</span>
<a name="l00022"></a>00022 <span class="comment"> * THIS SOFTWARE IS PROVIDED BY CARNEGIE MELLON UNIVERSITY ``AS IS'' AND </span>
<a name="l00023"></a>00023 <span class="comment"> * ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, </span>
<a name="l00024"></a>00024 <span class="comment"> * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR</span>
<a name="l00025"></a>00025 <span class="comment"> * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY</span>
<a name="l00026"></a>00026 <span class="comment"> * NOR ITS EMPLOYEES BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,</span>
<a name="l00027"></a>00027 <span class="comment"> * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT </span>
<a name="l00028"></a>00028 <span class="comment"> * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, </span>
<a name="l00029"></a>00029 <span class="comment"> * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY </span>
<a name="l00030"></a>00030 <span class="comment"> * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT </span>
<a name="l00031"></a>00031 <span class="comment"> * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE </span>
<a name="l00032"></a>00032 <span class="comment"> * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.</span>
<a name="l00033"></a>00033 <span class="comment"> *</span>
<a name="l00034"></a>00034 <span class="comment"> * ====================================================================</span>
<a name="l00035"></a>00035 <span class="comment"> *</span>
<a name="l00036"></a>00036 <span class="comment"> */</span>
<a name="l00037"></a>00037 <span class="comment">/* Sphinx II libad (Linux)</span>
<a name="l00038"></a>00038 <span class="comment"> * ^^^^^^^^^^^^^^^^^^^^^^^</span>
<a name="l00039"></a>00039 <span class="comment"> * $Id: ad_oss.c,v 1.9 2004/07/16 00:57:12 egouvea Exp $</span>
<a name="l00040"></a>00040 <span class="comment"> *</span>
<a name="l00041"></a>00041 <span class="comment"> * John G. Dorsey (jd5q+@andrew.cmu.edu)</span>
<a name="l00042"></a>00042 <span class="comment"> * Engineering Design Research Center</span>
<a name="l00043"></a>00043 <span class="comment"> * Carnegie Mellon University</span>
<a name="l00044"></a>00044 <span class="comment"> * ********************************************************************</span>
<a name="l00045"></a>00045 <span class="comment"> * </span>
<a name="l00046"></a>00046 <span class="comment"> * REVISION HISTORY</span>
<a name="l00047"></a>00047 <span class="comment"> *</span>
<a name="l00048"></a>00048 <span class="comment"> * 09-Aug-1999 Kevin Lenzo (lenzo@cs.cmu.edu) at Cernegie Mellon University.</span>
<a name="l00049"></a>00049 <span class="comment"> * Incorporated nickr@cs.cmu.edu's changes (marked below) and</span>
<a name="l00050"></a>00050 <span class="comment"> * SPS_EPSILON to allow for sample rates that are "close enough".</span>
<a name="l00051"></a>00051 <span class="comment"> * </span>
<a name="l00052"></a>00052 <span class="comment"> * 15-Jun-1999 M. K. Ravishankar (rkm@cs.cmu.edu) Consolidated all ad functions into</span>
<a name="l00053"></a>00053 <span class="comment"> * this one file. Added ad_open_sps().</span>
<a name="l00054"></a>00054 <span class="comment"> * Other cosmetic changes for consistency (e.g., use of err.h).</span>
<a name="l00055"></a>00055 <span class="comment"> * </span>
<a name="l00056"></a>00056 <span class="comment"> * 18-May-1999 Kevin Lenzo (lenzo@cs.cmu.edu) added <errno.h>.</span>
<a name="l00057"></a>00057 <span class="comment"> */</span>
<a name="l00058"></a>00058
<a name="l00059"></a>00059 <span class="preprocessor">#include <fcntl.h></span>
<a name="l00060"></a>00060 <span class="preprocessor">#include <stdio.h></span>
<a name="l00061"></a>00061 <span class="preprocessor">#include <stdlib.h></span>
<a name="l00062"></a>00062 <span class="preprocessor">#include <string.h></span>
<a name="l00063"></a>00063 <span class="preprocessor">#include <sys/soundcard.h></span>
<a name="l00064"></a>00064 <span class="preprocessor">#include <sys/ioctl.h></span>
<a name="l00065"></a>00065 <span class="preprocessor">#include <errno.h></span>
<a name="l00066"></a>00066 <span class="preprocessor">#include <unistd.h></span>
<a name="l00067"></a>00067 <span class="preprocessor">#include <config.h></span>
<a name="l00068"></a>00068
<a name="l00069"></a>00069 <span class="preprocessor">#include "prim_type.h"</span>
<a name="l00070"></a>00070 <span class="preprocessor">#include "ad.h"</span>
<a name="l00071"></a>00071
<a name="l00072"></a>00072 <span class="preprocessor">#define AUDIO_FORMAT AFMT_S16_LE </span><span class="comment">/* 16-bit signed, little endian */</span>
<a name="l00073"></a>00073 <span class="preprocessor">#define INPUT_GAIN (80)</span>
<a name="l00074"></a>00074 <span class="preprocessor"></span>
<a name="l00075"></a>00075 <span class="preprocessor">#define SPS_EPSILON 200</span>
<a name="l00076"></a>00076 <span class="preprocessor"></span><span class="preprocessor">#define SAMPLERATE_TOLERANCE 0.01</span>
<a name="l00077"></a>00077 <span class="preprocessor"></span>
<a name="l00078"></a>00078 <a class="code" href="structad__rec__t.html">ad_rec_t</a> *
<a name="l00079"></a>00079 <a class="code" href="ad_8h.html#a43f66257a2457d6c711dc5c694bfc02f" title="Open a specific audio device for recording.">ad_open_dev</a>(<span class="keyword">const</span> <span class="keywordtype">char</span> *dev, int32 sps)
<a name="l00080"></a>00080 {
<a name="l00081"></a>00081 <a class="code" href="structad__rec__t.html">ad_rec_t</a> *handle;
<a name="l00082"></a>00082 int32 dspFD, mixerFD;
<a name="l00083"></a>00083 int32 nonBlocking = 1, sourceMic = SOUND_MASK_MIC, inputGain =
<a name="l00084"></a>00084 INPUT_GAIN, devMask = 0;
<a name="l00085"></a>00085 int32 audioFormat = AUDIO_FORMAT;
<a name="l00086"></a>00086 int32 dspCaps = 0;
<a name="l00087"></a>00087 int32 sampleRate;
<a name="l00088"></a>00088 int32 numberChannels = 1;
<a name="l00089"></a>00089
<a name="l00090"></a>00090 sampleRate = sps;
<a name="l00091"></a>00091
<a name="l00092"></a>00092 <span class="keywordflow">if</span> (dev == NULL)
<a name="l00093"></a>00093 dev = DEFAULT_DEVICE;
<a name="l00094"></a>00094
<a name="l00095"></a>00095 <span class="comment">/* Used to have O_NDELAY. */</span>
<a name="l00096"></a>00096 <span class="keywordflow">if</span> ((dspFD = open(dev, O_RDONLY)) < 0) {
<a name="l00097"></a>00097 <span class="keywordflow">if</span> (errno == EBUSY)
<a name="l00098"></a>00098 fprintf(stderr, <span class="stringliteral">"%s(%d): Audio device(%s) busy\n"</span>,
<a name="l00099"></a>00099 __FILE__, __LINE__, dev);
<a name="l00100"></a>00100 <span class="keywordflow">else</span>
<a name="l00101"></a>00101 fprintf(stderr,
<a name="l00102"></a>00102 <span class="stringliteral">"%s(%d): Failed to open audio device(%s): %s\n"</span>,
<a name="l00103"></a>00103 __FILE__, __LINE__, dev, strerror(errno));
<a name="l00104"></a>00104 <span class="keywordflow">return</span> NULL;
<a name="l00105"></a>00105 }
<a name="l00106"></a>00106
<a name="l00107"></a>00107 <span class="keywordflow">if</span> (ioctl(dspFD, SNDCTL_DSP_SYNC, 0) < 0) {
<a name="l00108"></a>00108 fprintf(stderr, <span class="stringliteral">"Audio ioctl(SYNC) failed: %s\n"</span>, strerror(errno));
<a name="l00109"></a>00109 close(dspFD);
<a name="l00110"></a>00110 <span class="keywordflow">return</span> NULL;
<a name="l00111"></a>00111 }
<a name="l00112"></a>00112
<a name="l00113"></a>00113 <span class="keywordflow">if</span> (ioctl(dspFD, SNDCTL_DSP_RESET, 0) < 0) {
<a name="l00114"></a>00114 fprintf(stderr, <span class="stringliteral">"Audio ioctl(RESET) failed: %s\n"</span>,
<a name="l00115"></a>00115 strerror(errno));
<a name="l00116"></a>00116 close(dspFD);
<a name="l00117"></a>00117 <span class="keywordflow">return</span> NULL;
<a name="l00118"></a>00118 }
<a name="l00119"></a>00119
<a name="l00120"></a>00120 <span class="keywordflow">if</span> (ioctl(dspFD, SNDCTL_DSP_SETFMT, &audioFormat) < 0) {
<a name="l00121"></a>00121 fprintf(stderr, <span class="stringliteral">"Audio ioctl(SETFMT 0x%x) failed: %s\n"</span>,
<a name="l00122"></a>00122 audioFormat, strerror(errno));
<a name="l00123"></a>00123 close(dspFD);
<a name="l00124"></a>00124 <span class="keywordflow">return</span> NULL;
<a name="l00125"></a>00125 }
<a name="l00126"></a>00126 <span class="keywordflow">if</span> (audioFormat != AUDIO_FORMAT) {
<a name="l00127"></a>00127 fprintf(stderr,
<a name="l00128"></a>00128 <span class="stringliteral">"Audio ioctl(SETFMT): 0x%x, expected: 0x%x\n"</span>,
<a name="l00129"></a>00129 audioFormat, AUDIO_FORMAT);
<a name="l00130"></a>00130 close(dspFD);
<a name="l00131"></a>00131 <span class="keywordflow">return</span> NULL;
<a name="l00132"></a>00132 }
<a name="l00133"></a>00133
<a name="l00134"></a>00134 <span class="keywordflow">if</span> (ioctl(dspFD, SNDCTL_DSP_SPEED, &sampleRate) < 0) {
<a name="l00135"></a>00135 fprintf(stderr, <span class="stringliteral">"Audio ioctl(SPEED %d) failed %s\n"</span>,
<a name="l00136"></a>00136 sampleRate, strerror(errno));
<a name="l00137"></a>00137 close(dspFD);
<a name="l00138"></a>00138 <span class="keywordflow">return</span> NULL;
<a name="l00139"></a>00139 }
<a name="l00140"></a>00140 <span class="keywordflow">if</span> (sampleRate != sps) {
<a name="l00141"></a>00141 <span class="keywordflow">if</span> (abs(sampleRate - sps) <= (sampleRate * SAMPLERATE_TOLERANCE)) {
<a name="l00142"></a>00142 fprintf(stderr,
<a name="l00143"></a>00143 <span class="stringliteral">"Audio ioctl(SPEED) not perfect, but is acceptable. "</span>
<a name="l00144"></a>00144 <span class="stringliteral">"(Wanted %d, but got %d)\n"</span>, sampleRate, sps);
<a name="l00145"></a>00145 }
<a name="l00146"></a>00146 <span class="keywordflow">else</span> {
<a name="l00147"></a>00147 fprintf(stderr,
<a name="l00148"></a>00148 <span class="stringliteral">"Audio ioctl(SPEED): %d, expected: %d\n"</span>,
<a name="l00149"></a>00149 sampleRate, sps);
<a name="l00150"></a>00150 close(dspFD);
<a name="l00151"></a>00151 <span class="keywordflow">return</span> NULL;
<a name="l00152"></a>00152 }
<a name="l00153"></a>00153 }
<a name="l00154"></a>00154
<a name="l00155"></a>00155 <span class="keywordflow">if</span> (ioctl(dspFD, SNDCTL_DSP_CHANNELS, &numberChannels) < 0) {
<a name="l00156"></a>00156 fprintf(stderr, <span class="stringliteral">"Audio ioctl(CHANNELS %d) failed %s\n"</span>,
<a name="l00157"></a>00157 numberChannels, strerror(errno));
<a name="l00158"></a>00158 close(dspFD);
<a name="l00159"></a>00159 <span class="keywordflow">return</span> NULL;
<a name="l00160"></a>00160 }
<a name="l00161"></a>00161
<a name="l00162"></a>00162 <span class="keywordflow">if</span> (ioctl(dspFD, SNDCTL_DSP_NONBLOCK, &nonBlocking) < 0) {
<a name="l00163"></a>00163 fprintf(stderr, <span class="stringliteral">"ioctl(NONBLOCK) failed: %s\n"</span>, strerror(errno));
<a name="l00164"></a>00164 close(dspFD);
<a name="l00165"></a>00165 <span class="keywordflow">return</span> NULL;
<a name="l00166"></a>00166 }
<a name="l00167"></a>00167
<a name="l00168"></a>00168 <span class="keywordflow">if</span> (ioctl(dspFD, SNDCTL_DSP_GETCAPS, &dspCaps) < 0) {
<a name="l00169"></a>00169 fprintf(stderr, <span class="stringliteral">"ioctl(GETCAPS) failed: %s\n"</span>, strerror(errno));
<a name="l00170"></a>00170 close(dspFD);
<a name="l00171"></a>00171 <span class="keywordflow">return</span> NULL;
<a name="l00172"></a>00172 }
<a name="l00173"></a>00173 <span class="preprocessor">#if 0</span>
<a name="l00174"></a>00174 <span class="preprocessor"></span> printf(<span class="stringliteral">"DSP Revision %d:\n"</span>, dspCaps & DSP_CAP_REVISION);
<a name="l00175"></a>00175 printf(<span class="stringliteral">"DSP %s duplex capability.\n"</span>,
<a name="l00176"></a>00176 (dspCaps & DSP_CAP_DUPLEX) ? <span class="stringliteral">"has"</span> : <span class="stringliteral">"does not have"</span>);
<a name="l00177"></a>00177 printf(<span class="stringliteral">"DSP %s real time capability.\n"</span>,
<a name="l00178"></a>00178 (dspCaps & DSP_CAP_REALTIME) ? <span class="stringliteral">"has"</span> : <span class="stringliteral">"does not have"</span>);
<a name="l00179"></a>00179 printf(<span class="stringliteral">"DSP %s batch capability.\n"</span>,
<a name="l00180"></a>00180 (dspCaps & DSP_CAP_BATCH) ? <span class="stringliteral">"has"</span> : <span class="stringliteral">"does not have"</span>);
<a name="l00181"></a>00181 printf(<span class="stringliteral">"DSP %s coprocessor capability.\n"</span>,
<a name="l00182"></a>00182 (dspCaps & DSP_CAP_COPROC) ? <span class="stringliteral">"has"</span> : <span class="stringliteral">"does not have"</span>);
<a name="l00183"></a>00183 printf(<span class="stringliteral">"DSP %s trigger capability.\n"</span>,
<a name="l00184"></a>00184 (dspCaps & DSP_CAP_TRIGGER) ? <span class="stringliteral">"has"</span> : <span class="stringliteral">"does not have"</span>);
<a name="l00185"></a>00185 printf(<span class="stringliteral">"DSP %s memory map capability.\n"</span>,
<a name="l00186"></a>00186 (dspCaps & DSP_CAP_MMAP) ? <span class="stringliteral">"has"</span> : <span class="stringliteral">"does not have"</span>);
<a name="l00187"></a>00187 <span class="preprocessor">#endif</span>
<a name="l00188"></a>00188 <span class="preprocessor"></span>
<a name="l00189"></a>00189 <span class="keywordflow">if</span> ((dspCaps & DSP_CAP_DUPLEX)
<a name="l00190"></a>00190 && (ioctl(dspFD, SNDCTL_DSP_SETDUPLEX, 0) < 0))
<a name="l00191"></a>00191 fprintf(stderr, <span class="stringliteral">"ioctl(SETDUPLEX) failed: %s\n"</span>, strerror(errno));
<a name="l00192"></a>00192
<a name="l00193"></a>00193 <span class="comment">/* Patched by N. Roy (nickr@ri.cmu.edu), 99/7/23. </span>
<a name="l00194"></a>00194 <span class="comment"> Previously, mixer was set through dspFD. This is incorrect. Should</span>
<a name="l00195"></a>00195 <span class="comment"> be set through mixerFD, /dev/mixer. </span>
<a name="l00196"></a>00196 <span class="comment"> Also, only the left channel volume was being set.</span>
<a name="l00197"></a>00197 <span class="comment"> */</span>
<a name="l00198"></a>00198
<a name="l00199"></a>00199 <span class="keywordflow">if</span> ((mixerFD = open(<span class="stringliteral">"/dev/mixer"</span>, O_RDONLY)) < 0) {
<a name="l00200"></a>00200 <span class="keywordflow">if</span> (errno == EBUSY) {
<a name="l00201"></a>00201 fprintf(stderr, <span class="stringliteral">"%s %d: mixer device busy.\n"</span>,
<a name="l00202"></a>00202 __FILE__, __LINE__);
<a name="l00203"></a>00203 fprintf(stderr, <span class="stringliteral">"%s %d: Using current setting.\n"</span>,
<a name="l00204"></a>00204 __FILE__, __LINE__);
<a name="l00205"></a>00205 }
<a name="l00206"></a>00206 <span class="keywordflow">else</span> {
<a name="l00207"></a>00207 fprintf(stderr, <span class="stringliteral">"%s %d: %s\n"</span>, __FILE__, __LINE__,
<a name="l00208"></a>00208 strerror(errno));
<a name="l00209"></a>00209 exit(1);
<a name="l00210"></a>00210 }
<a name="l00211"></a>00211 }
<a name="l00212"></a>00212
<a name="l00213"></a>00213 <span class="keywordflow">if</span> (mixerFD >= 0) {
<a name="l00214"></a>00214 <span class="keywordflow">if</span> (ioctl(mixerFD, SOUND_MIXER_WRITE_RECSRC, &sourceMic) < 0) {
<a name="l00215"></a>00215 <span class="keywordflow">if</span> (errno == ENXIO)
<a name="l00216"></a>00216 fprintf(stderr,
<a name="l00217"></a>00217 <span class="stringliteral">"%s %d: can't set mic source for this device.\n"</span>,
<a name="l00218"></a>00218 __FILE__, __LINE__);
<a name="l00219"></a>00219 <span class="keywordflow">else</span> {
<a name="l00220"></a>00220 fprintf(stderr,
<a name="l00221"></a>00221 <span class="stringliteral">"%s %d: mixer set to mic: %s\n"</span>,
<a name="l00222"></a>00222 __FILE__, __LINE__, strerror(errno));
<a name="l00223"></a>00223 exit(1);
<a name="l00224"></a>00224 }
<a name="l00225"></a>00225 }
<a name="l00226"></a>00226
<a name="l00227"></a>00227 <span class="comment">/* Set the same gain for left and right channels. */</span>
<a name="l00228"></a>00228 inputGain = inputGain << 8 | inputGain;
<a name="l00229"></a>00229
<a name="l00230"></a>00230 <span class="comment">/* Some OSS devices have no input gain control, but do have a</span>
<a name="l00231"></a>00231 <span class="comment"> recording level control. Find out if this is one of them and</span>
<a name="l00232"></a>00232 <span class="comment"> adjust accordingly. */</span>
<a name="l00233"></a>00233 <span class="keywordflow">if</span> (ioctl(mixerFD, SOUND_MIXER_READ_DEVMASK, &devMask) < 0) {
<a name="l00234"></a>00234 fprintf(stderr,
<a name="l00235"></a>00235 <span class="stringliteral">"%s %d: failed to read device mask: %s\n"</span>,
<a name="l00236"></a>00236 __FILE__, __LINE__, strerror(errno));
<a name="l00237"></a>00237 exit(1); <span class="comment">/* FIXME: not a well-behaved-library thing to do! */</span>
<a name="l00238"></a>00238 }
<a name="l00239"></a>00239 <span class="keywordflow">if</span> (devMask & SOUND_MASK_IGAIN) {
<a name="l00240"></a>00240 <span class="keywordflow">if</span> (ioctl(mixerFD, SOUND_MIXER_WRITE_IGAIN, &inputGain) < 0) {
<a name="l00241"></a>00241 fprintf(stderr,
<a name="l00242"></a>00242 <span class="stringliteral">"%s %d: mixer input gain to %d: %s\n"</span>,
<a name="l00243"></a>00243 __FILE__, __LINE__, inputGain, strerror(errno));
<a name="l00244"></a>00244 exit(1);
<a name="l00245"></a>00245 }
<a name="l00246"></a>00246 }
<a name="l00247"></a>00247 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (devMask & SOUND_MASK_RECLEV) {
<a name="l00248"></a>00248 <span class="keywordflow">if</span> (ioctl(mixerFD, SOUND_MIXER_WRITE_RECLEV, &inputGain) < 0) {
<a name="l00249"></a>00249 fprintf(stderr,
<a name="l00250"></a>00250 <span class="stringliteral">"%s %d: mixer record level to %d: %s\n"</span>,
<a name="l00251"></a>00251 __FILE__, __LINE__, inputGain, strerror(errno));
<a name="l00252"></a>00252 exit(1);
<a name="l00253"></a>00253 }
<a name="l00254"></a>00254 }
<a name="l00255"></a>00255 <span class="keywordflow">else</span> {
<a name="l00256"></a>00256 fprintf(stderr,
<a name="l00257"></a>00257 <span class="stringliteral">"%s %d: can't set input gain/recording level for this device.\n"</span>,
<a name="l00258"></a>00258 __FILE__, __LINE__);
<a name="l00259"></a>00259 }
<a name="l00260"></a>00260
<a name="l00261"></a>00261 close(mixerFD);
<a name="l00262"></a>00262 }
<a name="l00263"></a>00263
<a name="l00264"></a>00264 <span class="keywordflow">if</span> ((handle = (<a class="code" href="structad__rec__t.html">ad_rec_t</a> *) calloc(1, <span class="keyword">sizeof</span>(<a class="code" href="structad__rec__t.html">ad_rec_t</a>))) == NULL) {
<a name="l00265"></a>00265 fprintf(stderr, <span class="stringliteral">"calloc(%ld) failed\n"</span>, <span class="keyword">sizeof</span>(<a class="code" href="structad__rec__t.html">ad_rec_t</a>));
<a name="l00266"></a>00266 abort();
<a name="l00267"></a>00267 }
<a name="l00268"></a>00268
<a name="l00269"></a>00269 handle->dspFD = dspFD;
<a name="l00270"></a>00270 handle->recording = 0;
<a name="l00271"></a>00271 handle-><a class="code" href="structad__rec__t.html#ac8ccccdc755f68cb4ad24007b36d6c8a" title="Samples/sec.">sps</a> = sps;
<a name="l00272"></a>00272 handle-><a class="code" href="structad__rec__t.html#ade5a608978908d87deea7fa9827f8510" title="Bytes/sample.">bps</a> = <span class="keyword">sizeof</span>(int16);
<a name="l00273"></a>00273
<a name="l00274"></a>00274 <span class="keywordflow">return</span> (handle);
<a name="l00275"></a>00275 }
<a name="l00276"></a>00276
<a name="l00277"></a>00277 <a class="code" href="structad__rec__t.html">ad_rec_t</a> *
<a name="l00278"></a>00278 <a class="code" href="ad_8h.html#a71b4eec805fbe5c398ea0897816de6f0" title="Open the default audio device with a given sampling rate.">ad_open_sps</a>(int32 sps)
<a name="l00279"></a>00279 {
<a name="l00280"></a>00280 <span class="keywordflow">return</span> <a class="code" href="ad_8h.html#a43f66257a2457d6c711dc5c694bfc02f" title="Open a specific audio device for recording.">ad_open_dev</a>(DEFAULT_DEVICE, sps);
<a name="l00281"></a>00281 }
<a name="l00282"></a>00282
<a name="l00283"></a>00283 <a class="code" href="structad__rec__t.html">ad_rec_t</a> *
<a name="l00284"></a>00284 <a class="code" href="ad_8h.html#a3def0da951e840fb4c72ef9259540686" title="Open the default audio device.">ad_open</a>(<span class="keywordtype">void</span>)
<a name="l00285"></a>00285 {
<a name="l00286"></a>00286 <span class="keywordflow">return</span> <a class="code" href="ad_8h.html#a71b4eec805fbe5c398ea0897816de6f0" title="Open the default audio device with a given sampling rate.">ad_open_sps</a>(DEFAULT_SAMPLES_PER_SEC);
<a name="l00287"></a>00287 }
<a name="l00288"></a>00288
<a name="l00289"></a>00289 int32
<a name="l00290"></a>00290 ad_close(<a class="code" href="structad__rec__t.html">ad_rec_t</a> * handle)
<a name="l00291"></a>00291 {
<a name="l00292"></a>00292 <span class="keywordflow">if</span> (handle->dspFD < 0)
<a name="l00293"></a>00293 <span class="keywordflow">return</span> AD_ERR_NOT_OPEN;
<a name="l00294"></a>00294
<a name="l00295"></a>00295 <span class="keywordflow">if</span> (handle->recording) {
<a name="l00296"></a>00296 <span class="keywordflow">if</span> (ad_stop_rec(handle) < 0)
<a name="l00297"></a>00297 <span class="keywordflow">return</span> AD_ERR_GEN;
<a name="l00298"></a>00298 }
<a name="l00299"></a>00299
<a name="l00300"></a>00300 close(handle->dspFD);
<a name="l00301"></a>00301 free(handle);
<a name="l00302"></a>00302
<a name="l00303"></a>00303 <span class="keywordflow">return</span> (0);
<a name="l00304"></a>00304 }
<a name="l00305"></a>00305
<a name="l00306"></a>00306 int32
<a name="l00307"></a>00307 ad_start_rec(<a class="code" href="structad__rec__t.html">ad_rec_t</a> * handle)
<a name="l00308"></a>00308 {
<a name="l00309"></a>00309 <span class="keywordflow">if</span> (handle->dspFD < 0)
<a name="l00310"></a>00310 <span class="keywordflow">return</span> AD_ERR_NOT_OPEN;
<a name="l00311"></a>00311
<a name="l00312"></a>00312 <span class="keywordflow">if</span> (handle->recording)
<a name="l00313"></a>00313 <span class="keywordflow">return</span> AD_ERR_GEN;
<a name="l00314"></a>00314
<a name="l00315"></a>00315 <span class="comment">/* Sample rate, format, input mix settings, &c. are configured</span>
<a name="l00316"></a>00316 <span class="comment"> * with ioctl(2) calls under Linux. It makes more sense to handle</span>
<a name="l00317"></a>00317 <span class="comment"> * these at device open time and consider the state of the device</span>
<a name="l00318"></a>00318 <span class="comment"> * to be fixed until closed.</span>
<a name="l00319"></a>00319 <span class="comment"> */</span>
<a name="l00320"></a>00320
<a name="l00321"></a>00321 handle->recording = 1;
<a name="l00322"></a>00322
<a name="l00323"></a>00323 <span class="comment">/* rkm@cs: This doesn't actually do anything. How do we turn recording on/off? */</span>
<a name="l00324"></a>00324
<a name="l00325"></a>00325 <span class="keywordflow">return</span> (0);
<a name="l00326"></a>00326 }
<a name="l00327"></a>00327
<a name="l00328"></a>00328 int32
<a name="l00329"></a>00329 ad_stop_rec(<a class="code" href="structad__rec__t.html">ad_rec_t</a> * handle)
<a name="l00330"></a>00330 {
<a name="l00331"></a>00331 <span class="keywordflow">if</span> (handle->dspFD < 0)
<a name="l00332"></a>00332 <span class="keywordflow">return</span> AD_ERR_NOT_OPEN;
<a name="l00333"></a>00333
<a name="l00334"></a>00334 <span class="keywordflow">if</span> (!handle->recording)
<a name="l00335"></a>00335 <span class="keywordflow">return</span> AD_ERR_GEN;
<a name="l00336"></a>00336
<a name="l00337"></a>00337 <span class="keywordflow">if</span> (ioctl(handle->dspFD, SNDCTL_DSP_SYNC, 0) < 0) {
<a name="l00338"></a>00338 fprintf(stderr, <span class="stringliteral">"Audio ioctl(SYNC) failed: %s\n"</span>, strerror(errno));
<a name="l00339"></a>00339 <span class="keywordflow">return</span> AD_ERR_GEN;
<a name="l00340"></a>00340 }
<a name="l00341"></a>00341
<a name="l00342"></a>00342 handle->recording = 0;
<a name="l00343"></a>00343
<a name="l00344"></a>00344 <span class="keywordflow">return</span> (0);
<a name="l00345"></a>00345 }
<a name="l00346"></a>00346
<a name="l00347"></a>00347 int32
<a name="l00348"></a>00348 ad_read(<a class="code" href="structad__rec__t.html">ad_rec_t</a> * handle, int16 * buf, int32 max)
<a name="l00349"></a>00349 {
<a name="l00350"></a>00350 int32 length;
<a name="l00351"></a>00351
<a name="l00352"></a>00352 length = max * handle-><a class="code" href="structad__rec__t.html#ade5a608978908d87deea7fa9827f8510" title="Bytes/sample.">bps</a>; <span class="comment">/* #samples -> #bytes */</span>
<a name="l00353"></a>00353
<a name="l00354"></a>00354 <span class="keywordflow">if</span> ((length = read(handle->dspFD, buf, length)) > 0) {
<a name="l00355"></a>00355 <span class="preprocessor">#if 0</span>
<a name="l00356"></a>00356 <span class="preprocessor"></span> <span class="keywordflow">if</span> ((length % handle-><a class="code" href="structad__rec__t.html#ade5a608978908d87deea7fa9827f8510" title="Bytes/sample.">bps</a>) != 0)
<a name="l00357"></a>00357 fprintf(stderr,
<a name="l00358"></a>00358 <span class="stringliteral">"Audio read returned non-integral #sample bytes (%d)\n"</span>,
<a name="l00359"></a>00359 length);
<a name="l00360"></a>00360 <span class="preprocessor">#endif</span>
<a name="l00361"></a>00361 <span class="preprocessor"></span> length /= handle-><a class="code" href="structad__rec__t.html#ade5a608978908d87deea7fa9827f8510" title="Bytes/sample.">bps</a>;
<a name="l00362"></a>00362 }
<a name="l00363"></a>00363
<a name="l00364"></a>00364 <span class="keywordflow">if</span> (length < 0) {
<a name="l00365"></a>00365 <span class="keywordflow">if</span> (errno != EAGAIN) {
<a name="l00366"></a>00366 fprintf(stderr, <span class="stringliteral">"Audio read error"</span>);
<a name="l00367"></a>00367 <span class="keywordflow">return</span> AD_ERR_GEN;
<a name="l00368"></a>00368 }
<a name="l00369"></a>00369 <span class="keywordflow">else</span> {
<a name="l00370"></a>00370 length = 0;
<a name="l00371"></a>00371 }
<a name="l00372"></a>00372 }
<a name="l00373"></a>00373
<a name="l00374"></a>00374 <span class="keywordflow">if</span> ((length == 0) && (!handle->recording))
<a name="l00375"></a>00375 <span class="keywordflow">return</span> AD_EOF;
<a name="l00376"></a>00376
<a name="l00377"></a>00377 <span class="keywordflow">return</span> length;
<a name="l00378"></a>00378 }
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