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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN">
<html>
<head>
<title>Building an Audio CD Player, Listing 4</title>
</head>
<body bgcolor="#FFFFFF" text="000000">
<p><HR> <P>
<h3>Listing 4. Jcd_Drive_ix86-Linux.c</h3>
<p><HR> <P>
<pre>
#include &lt;sys/types.h> /* 1 */
#include &lt;sys/stat.h> /* 2 */
#include &lt;fcntl.h> /* 3 */
#include &lt;linux/cdrom.h> /* 4 */
#include &lt;sys/ioctl.h> /* 5 */
#include &lt;unistd.h> /* 6 */
#include &lt;stdlib.h> /* 7 */
#include &lt;stdio.h> /* 8 */
#include &lt;time.h> /* 9 */
#include &quot;Jcd_Drive.h&quot; /* 10 */
/** 12
Jcd - Java CD Audio Player 13
Michael Hamilton (michael@actrix.gen.nz). 14
All rights reserved. 15
*/ /* 16 */
* This code could be far more integrated into
* the Java code, but I may want to used it
* with python (my prefered langauge), so I'm
* avoiding this for now. Ignoring supporting
* multi-disc players for now, but the java
* class allows for it in the future. 22
* If using kaffe generate .h with
* &quot;kaffeh Jcd/Drive&quot; 24
*/ /* 26 */
#ifdef TRUE /* 28 */
#undef TRUE /* 29 */
#undef FALSE /* 30 */
#endif /* 31 */
#define TRUE 1 /* 33 */
#define FALSE 0 /* 34 */
/* 36
* Javah and Kaffeh differ over the type of long
* in Java-1.1.1 this is int32_t 38
*/
#ifndef KAFFE /* 39 */
# define Java_Int long /* Java 1.0 */ /* 40 */
#else /* 41 */
# define Java_Int jint /* kaffeh */ /* 42 */
#endif /* 43 */
#define FRAMES_PER_SECOND \
Jcd_Drive_FRAMES_PER_SECOND /* 46 */
#define MAX_DEVICE_LEN 512 /* 47 */
#define MAX_ERROR_LEN 512 /* 48 */
#define FRAME_ADDRESS(mins, secs, frames) \
(((mins) * FRAMES_PER_SECOND * 60) + \
((secs) * FRAMES_PER_SECOND) + (frames))
static int debug; /* 53 */
static void
yield_player(struct HJcd_Drive *drive);/* 55 */
static void
take_player(struct HJcd_Drive *drive); /* 56 */
static void take_player(struct HJcd_Drive *drive)
{ /* 59 */
/* 60
* If not already open, open the device. 61
*/ /* 62 */
if (unhand(drive)->fd == -1) { /* 63 */
char device_name[MAX_DEVICE_LEN + 1];/* 64 */
javaString2CString(
unhand(drive)->device_name,device_name,
MAX_DEVICE_LEN); /* 65 */
if (device_name == '\0') { /* 66 */
char *device = getenv(&quot;CDROM&quot;); /* 67 */
if (device == NULL) /* 68 */
strcpy(device_name, &quot;/dev/cdrom&quot;);
} /* 70 */
unhand(drive)->device_flags |=
(getenv(&quot;SBPCD&quot;) != NULL) ? /* 71 */
Jcd_Drive_FLAG_STOP_PLAY : /* 72 */
Jcd_Drive_FLAG_NONE; /* 73 */
unhand(drive)->fd =open(device_name,O_RDONLY);
if (debug) /* 77 */
fprintf(stderr,
&quot;Openned %s flags=%d fd=%d\n &quot;,
device_name, /* 79 */
unhand(drive)->device_flags,
unhand(drive)->fd); /* 81 */
} /* 82 */
} /* 83 */
static void yield_player(struct HJcd_Drive *drive)
{ /* 87 */
/* 88
* Close the device, make it available to others.
*/ /* 90 */
if (unhand(drive)->fd != -1) { /* 91 */
close(unhand(drive)->fd); /* 92 */
} /* 93 */
unhand(drive)->fd = -1; /* 95 */
unhand(drive)->current_track = 1; /* 96 */
unhand(drive)->current_index = 1; /* 97 */
unhand(drive)->number_of_tracks = 0; /* 98 */
unhand(drive)->audio_status =
Jcd_Drive_STATUS_INVALID; /* 99 */
if (debug) /* 101 */
fprintf(stderr, &quot;closed cd device\n&quot;);
} /* 103 */
static Java_Int
new_status(struct HJcd_Drive *drive) /* 105 */
{ /* 106 */
* Try to obtain the device and query its status.
* May cause the tray to close with some drivers.
*/ /* 110 */
struct cdrom_subchnl ch; /* 111 */
long stat; /* 112 */
unhand(drive)->current_track = 1; /* 114 */
unhand(drive)->current_index = 1; /* 115 */
unhand(drive)->current_address = 0; /* 116 */
if (unhand(drive)->fd == -1) {
/* See if there's a new CD */
take_player(drive); /* 120 */
if (unhand(drive)->fd != -1) { /* 121 */
struct cdrom_tochdr tinfo; /* 122 */
stat = ioctl(unhand(drive)->fd,
CDROMREADTOCHDR,
&tinfo); /* 123 */
if (stat == -1) { /* 124 */
yield_player(drive); /* 125 */
unhand(drive)->audio_status =
Jcd_Drive_STATUS_INVALID; /* 126 */
return (Java_Int)
unhand(drive)->audio_status; /* 127 */
} /* 128 */
unhand(drive)->number_of_tracks =
tinfo.cdth_trk1; /* 129 */
if (debug) /* 130 */
fprintf(stderr, /* 131 */
&quot;number_of_tracks=%d\n&quot;,
unhand(drive)->number_of_tracks);
} /* 134 */
} /* 135 */
ch.cdsc_format = CDROM_MSF; /* 137 */
stat = ioctl(unhand(drive)->fd,
CDROMSUBCHNL,
&ch); /* 139 */
if (stat == -1) { /* Assume no CD in drive */
yield_player(drive); /* 141 */
unhand(drive)->audio_status =
Jcd_Drive_STATUS_INVALID; /* 142 */
return (Java_Int) unhand(drive)->audio_status;
} /* 144 */
unhand(drive)->current_track = ch.cdsc_trk;
unhand(drive)->current_index = ch.cdsc_ind;
unhand(drive)->current_address =
FRAME_ADDRESS(ch.cdsc_absaddr.msf.minute,
ch.cdsc_absaddr.msf.second,
ch.cdsc_absaddr.msf.frame);
unhand(drive)->audio_status = /* 153 */
ch.cdsc_audiostatus; /* 154 */
return (Java_Int) unhand(drive)->audio_status;
} /* 157 */
static int is_open(struct HJcd_Drive *drive)
{ /* 160 */
if (unhand(drive)->fd == -1) { /* 161 */
return FALSE; /* 163 */
} /* 164 */
return TRUE; /* 165 */
} /* 166 */
static int /* 168 */
is_available_now(struct HJcd_Drive *drive)
{ /* 169 */
new_status(drive); /* 170 */
return is_open(drive); /* 171 */
} /* 172 */
void Jcd_Drive_initDrive(struct HJcd_Drive *drive)
{ /* 175 */
fprintf(stderr, &quot;Initializing cd drive...\n&quot;);
debug = getenv(&quot;JCD_DEBUG&quot;) != NULL; /* 177 */
new_status(drive); /* 178 */
} /* 179 */
Java_Int /* 181 */
Jcd_Drive_status(struct HJcd_Drive *drive)
{ /* 182 */
if (unhand(drive)->fd == -1) { /* 183 */
return unhand(drive)->audio_status; /* 184 */
} /* 185 */
else { /* 186 */
return new_status(drive); /* 187 */
} /* 188 */
} /* 189 */
Java_Int /* 191 */
Jcd_Drive_currentTrack(struct HJcd_Drive *drive)
{ /* 192 */
if (!is_available_now(drive)) { return 1; }
return unhand(drive)->current_track; /* 194 */
} /* 195 */
Java_Int /* 197 */
Jcd_Drive_currentIndex(struct HJcd_Drive *drive)
{ /* Must call current track first */ /* 198 */
if (!is_available_now(drive)) { return 1; }
return unhand(drive)->current_index; /* 200 */
} /* 201 */
Java_Int /* 204 */
Jcd_Drive_currentAddress(struct HJcd_Drive *drive)
{ /* 205 */
if (!is_available_now(drive)) { return 0; }
return unhand(drive)->current_address; /* 207 */
} /* 208 */
Java_Int
Jcd_Drive_numberOfTracks(struct HJcd_Drive *drive)
{ /* 212 */
if (!is_open(drive)) { return 0; } /* 213 */
return unhand(drive)->number_of_tracks;/* 214 */
} /* 215 */
Java_Int /* 218 */
Jcd_Drive_trackAddress(struct HJcd_Drive *drive,
Java_Int track)
{ /* 219 */
struct cdrom_tocentry tocentry; /* 220 */
if (!is_open(drive)) { return 0; } /* 222 */
tocentry.cdte_track = track; /* 223 */
tocentry.cdte_format = CDROM_MSF; /* 224 */
if ((ioctl(unhand(drive)->fd,
CDROMREADTOCENTRY,
&tocentry)) == -1) {
if (debug) /* 226 */
fprintf(stderr, &quot;tae=%d\n&quot;, track);/* 227 */
SignalError(0,
&quot;Jcd/TrackAddressException&quot;,
strerror(errno)); /* 228 */
return 0; /* 229 */
} /* 230 */
return /* 231 */
FRAME_ADDRESS(tocentry.cdte_addr.msf.minute,
tocentry.cdte_addr.msf.second,
tocentry.cdte_addr.msf.frame);
} /* 234 */
Java_Int
Jcd_Drive_trackLength(struct HJcd_Drive *drive,
Java_Int n) /* 236 */
{ /* 237 */
int starts_at =Jcd_Drive_trackAddress(drive, n);
int start_of_next = /* 239 */
(n >= unhand(drive)->number_of_tracks)
? Jcd_Drive_cdEndAddress(drive) /* 241 */
: Jcd_Drive_trackAddress(drive, n + 1);
return start_of_next - starts_at; /* 243 */
} /* 244 */
Java_Int /* 247 */
Jcd_Drive_cdEndAddress(struct HJcd_Drive *drive)
{ /* 248 */
if (!is_open(drive)) { return 0; } /* 249 */
return /* 250 */
Jcd_Drive_trackAddress(drive, CDROM_LEADOUT);
} /* 251 */
static int cddbSum(int n) /* 253 */
{ /* Sum the digits */ /* 254 */
int s = 0; /* 255 */
while (n != 0) { /* 256 */
s += n % 10; /* 257 */
n = n / 10; /* 258 */
} /* 259 */
return s; /* 260 */
} /* 261 */
struct Hjava_lang_String *Jcd_Drive_cddbID(
struct HJcd_Drive *drive) /* 263 */
{ /* 264 */
/* see http://sunsite.unc.edu~/cddb/xjcd/ */
char id[10] = &quot;00000000&quot;; /* 266 */
int i; /* 267 */
int t = 0; /* 268 */
int n = 0; /* 269 */
if (!is_open(drive))
{ return makeJavaString(id, 8); } /* 271 */
for (i = 1;
i
i++) { /* 272 */
n += cddbSum(Jcd_Drive_trackAddress(drive, i)
/ FRAMES_PER_SECOND);
t += (Jcd_Drive_trackLength(drive, i) /
FRAMES_PER_SECOND) ; /* 274 */
} /* 275 */
i = ((n % 0xff)
&lt;&lt; 24 | t
&lt;&lt; 8 | (unhand(drive)->number_of_tracks));
sprintf(id, &quot;%08x&quot;, i); /* 277 */
return makeJavaString(id, 8); /* 278 */
} /* 279 */
void Jcd_Drive_play(struct HJcd_Drive *drive,
Java_Int start_track,
Java_Int start_index,
Java_Int end_track,
Java_Int end_index)
{ /* 286 */
struct cdrom_ti ti; /* 287 */
long stat; /* 288 */
unhand(drive)->current_track = 1; /* 290 */
if (!is_available_now(drive)) { return; }
if (debug) /* 294 */
fprintf(stderr, /* 295 */
&quot;play %d %d %d\n&quot;, /* 296 */
start_track,
end_track,
unhand(drive)->number_of_tracks);
if (end_track == 0) {
/* Kludge for first call to play. */ /* 299 */
end_track = unhand(drive)->number_of_tracks;
} /* 301 */
if (start_track
start_track > unhand(drive)->number_of_tracks)
{
SignalError(0,
&quot;Jcd/DriveException&quot;,
&quot;Play: start track out of range.&quot;);
return; /* 305 */
} /* 306 */
if (end_track
end_track > unhand(drive)->number_of_tracks)
{
SignalError(0,
&quot;Jcd/DriveException&quot;,
&quot;Play: end track out of range.&quot;);
return; /* 310 */
} /* 311 */
if (!is_open(drive)) { /* 313 */
return; /* 314 */
} /* 315 */
if ((unhand(drive)->device_flags &
Jcd_Drive_FLAG_STOP_PLAY)) { /* 317 */
/* Must issue stop before play. */
Jcd_Drive_stop(drive); /* 318 */
} /* 319 */
if (debug) /* 321 */
fprintf(stderr, &quot;try play %d\n&quot;, start_track);
ti.cdti_trk0 = start_track; /* 324 */
ti.cdti_ind0 = start_index; /* 325 */
ti.cdti_trk1 = end_track; /* 326 */
ti.cdti_ind1 = end_index; /* 327 */
if (ti.cdti_ind1 == 0) { /* 329 */
/* Doesn't seem to be a way of specifying end
* index. But this seems to work. 331
*/ /* 332 */
ti.cdti_ind1 =unhand(drive)->number_of_tracks;
} /* 334 */
stat = ioctl(unhand(drive)->fd,
CDROMPLAYTRKIND,
&ti); /* 336 */
if (stat
SignalError(0, &quot;Jcd/PlayException&quot;,
strerror(errno)); /* 338 */
return; /* 339 */
} /* 340 */
unhand(drive)->current_track = start_track;
if (debug) /* 344 */
fprintf(stderr, &quot;playing %d\n&quot;, /* 346 */
unhand(drive)->current_track);
} /* 346 */
void Jcd_Drive_stop(struct HJcd_Drive *drive)
{ /* 350 */
if (!is_available_now(drive)) { return; }
if (ioctl(unhand(drive)->fd, CDROMSTOP) == -1) {
SignalError(0, &quot;Jcd/StopException&quot;,
strerror(errno)); /* 354 */
} /* 355 */
} /* 356 */
void Jcd_Drive_pause(struct HJcd_Drive *drive)
{ /* 360 */
if (!is_available_now(drive)) { return; }
if (unhand(drive)->audio_status !=
Jcd_Drive_STATUS_PLAY) { /* 363 */
SignalError(0, &quot;Jcd/PauseException&quot;,
&quot;Pause: drive isn't playing.&quot;);
return; /* 365 */
} /* 366 */
if (ioctl(unhand(drive)->fd,CDROMPAUSE) == -1) {
SignalError(0, &quot;Jcd/PauseException&quot;,
strerror(errno)); /* 369 */
} /* 370 */
} /* 371 */
void Jcd_Drive_resume(struct HJcd_Drive *drive)
{ /* 375 */
if (!is_available_now(drive)) { return; }
if (unhand(drive)->audio_status !=
Jcd_Drive_STATUS_PAUSED) { /* 378 */
SignalError(0, &quot;Jcd/ResumeException&quot;,
&quot;Resume: drive isn't paused.&quot;);
return; /* 380 */
} /* 381 */
if (ioctl(unhand(drive)->fd,CDROMRESUME) == -1){
SignalError(0, &quot;Jcd/ResumeException&quot;,
strerror(errno)); /* 384 */
} /* 385 */
} /* 386 */
void Jcd_Drive_eject(struct HJcd_Drive *drive)
{ /* 390 */
long retract = unhand(drive)->fd == -1;
if (!is_available_now(drive)) { return; }
if (retract) { return; } /* 396 */
Jcd_Drive_stop(drive); /* 399 */
if (ioctl(unhand(drive)->fd,CDROMEJECT) == -1) {
SignalError(0, &quot;Jcd/EjectException&quot;,
strerror(errno)); /* 402 */
} /* 403 */
yield_player(drive); /* 405 */
} /* 406 */
Java_Int /* 409 */
Jcd_Drive_volume(struct HJcd_Drive *drive)
{ /* 410 */
struct cdrom_volctrl vol; /* 411 */
if (!is_available_now(drive)) { return; }
if (ioctl(unhand(drive)->fd, CDROMVOLREAD,
&vol) == -1) { /* 415 */
SignalError(0, &quot;Jcd/VolumeException&quot;,
strerror(errno)); /* 416 */
return 0; /* 417 */
} /* 418 */
return vol.channel0; /* 419 */
} /* 420 */
void Jcd_Drive_setVolume(struct HJcd_Drive *drive,
Java_Int volume)
{ /* 423 */
struct cdrom_volctrl vol; /* 424 */
if (!is_available_now(drive)) { return; }
if (volume
SignalError(0, &quot;Jcd/SetVolumeException&quot;,
&quot;Volume out of range.&quot;); /* 429 */
return; /* 430 */
} /* 431 */
vol.channel0 = volume; /* 433 */
vol.channel1 = volume; /* 434 */
vol.channel2 = volume; /* 435 */
vol.channel3 = volume; /* 436 */
if (ioctl(unhand(drive)->fd, CDROMVOLCTRL,
&vol) == -1) { /* 438 */
SignalError(0, &quot;Jcd/SetVolumeException&quot;,
strerror(errno)); /* 439 */
} /* 440 */
} /* 441 */
struct Hjava_lang_String * /* 444 */
Jcd_Drive_productCode(struct HJcd_Drive *drive)
{ /* 445 */
char upc[9] = &quot;00000000&quot;; /* 446 */
if (!is_available_now(drive)) {
return makeJavaString(upc, 8); /* 448 */
} /* 449 */
if (ioctl(unhand(drive)->fd, CDROM_GET_UPC, upc)
== -1) { /* 450 */
SignalError(0, &quot;Jcd/ProductCodeException&quot;,
strerror(errno)); /* 451 */
} /* 452 */
return makeJavaString(upc, 8); /* 453 */
} /* 454 */
</pre>
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