James Courtier-Dutton <James@superbug.demon.co.uk>

I attach a patch that updates the speaker-test program.
It corrects a few minor bugs as well as add a new -s option.

speaker-test/readme.txt

@@ -9,4 +9,6 @@ To test: -
 ./speaker-test -Dsurround40 -c4
 3) A 5.1 speaker setup from three stereo jacks: -
 ./speaker-test -Dsurround51 -c6
+4) To send a nice low 75Hz tone to the Woofer and then exit without touching any other speakers: -
+./speaker-test -Dplug:surround51 -c6 -s1 -f75
 

speaker-test/speaker-test.c

@@ -10,7 +10,7 @@
  * the Free Software Foundation; either version 2 of the License, or
  * (at your option) any later version.
  *
- * xine is distributed in the hope that it will be useful,
+ * speaker-test 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.
@@ -40,8 +40,9 @@
 
 static char              *device      = "plughw:0,0";       /* playback device */
 static snd_pcm_format_t   format      = SND_PCM_FORMAT_S16; /* sample format */
-static unsigned int       rate        = 44100;	            /* stream rate */
+static unsigned int       rate        = 48000;	            /* stream rate */
 static unsigned int       channels    = 1;	            /* count of channels */
+static unsigned int       speaker     = 0;	            /* count of channels */
 static unsigned int       buffer_time = 500000;	            /* ring buffer length in us */
 static unsigned int       period_time = 100000;	            /* period time in us */
 static double             freq        = 440;                /* sinusoidal wave frequency in Hz */
@@ -307,10 +308,9 @@ static int write_loop(snd_pcm_t *handle, int channel, int periods, signed short
 }
 
 static void help(void) {
-  int k;
 
   printf(
-      "Usage: latency [OPTION]... [FILE]...\n"
+      "Usage: speaker-test [OPTION]... \n"
       "-h,--help	help\n"
       "-D,--device	playback device\n"
       "-r,--rate	stream rate in Hz\n"
@@ -318,8 +318,9 @@ static void help(void) {
       "-f,--frequency	sine wave frequency in Hz\n"
       "-b,--buffer	ring buffer size in us\n"
       "-p,--period	period size in us\n"
+      "-s,--speaker	single speaker test. Values 1=Left or 2=right\n"
       "\n");
-
+#if 0
   printf("Recognized sample formats are:");
   for (k = 0; k < SND_PCM_FORMAT_LAST; ++k) {
     const char *s = snd_pcm_format_name(k);
@@ -328,6 +329,8 @@ static void help(void) {
   }
 
   printf("\n\n");
+#endif
+
 }
 
 int main(int argc, char *argv[]) {
@@ -345,6 +348,7 @@ int main(int argc, char *argv[]) {
     {"frequency", 1, NULL, 'f'},
     {"buffer",    1, NULL, 'b'},
     {"period",    1, NULL, 'p'},
+    {"speaker",    1, NULL, 's'},
     {NULL,        0, NULL, 0  },
   };
 
@@ -357,7 +361,7 @@ int main(int argc, char *argv[]) {
   while (1) {
     int c;
     
-    if ((c = getopt_long(argc, argv, "hD:r:c:f:b:p:m:", long_option, NULL)) < 0)
+    if ((c = getopt_long(argc, argv, "hD:r:c:f:b:p:s:", long_option, NULL)) < 0)
       break;
     
     switch (c) {
@@ -392,6 +396,15 @@ int main(int argc, char *argv[]) {
       period_time = period_time < 1000 ? 1000 : period_time;
       period_time = period_time > 1000000 ? 1000000 : period_time;
       break;
+    case 's':
+      speaker = atoi(optarg);
+      speaker = speaker < 1 ? 0 : speaker;
+      speaker = speaker > channels ? 0 : speaker;
+      if (speaker==0) {
+        printf("Invalid parameter for -s option.\n");
+        exit(EXIT_FAILURE);
+      }  
+      break;
     default:
       printf("Unknown option '%c'\n", c);
       exit(EXIT_FAILURE);
@@ -433,7 +446,7 @@ int main(int argc, char *argv[]) {
     printf("No enough memory\n");
     exit(EXIT_FAILURE);
   }
-
+  if (speaker==0) {
     while (1) {
 
       for(chn = 0; chn < channels; chn++) {
@@ -447,6 +460,15 @@ int main(int argc, char *argv[]) {
         }
       }
     }
+  } else {
+    printf("  - %s\n", channel_name[speaker-1]);
+    err = write_loop(handle, speaker-1, ((rate*5)/period_size), samples);
+
+    if (err < 0) {
+      printf("Transfer failed: %s\n", snd_strerror(err));
+    }
+  }
+
 
   free(samples);
   snd_pcm_close(handle);