speaker-test: Add option to specify signal scale

Allow generated signals (sine and noise) to have a specified signal scale
instead of using hardcoded limits of 80%. This can be handy for debugging, ie
when analysing clipping issues with audio drivers.

Signed-off-by: Julian Scheel <julian@jusst.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/speaker-test/speaker-test.c b/speaker-test/speaker-test.c
index ccf2671725a3c16318d3a25c2e51abcadab4d963..25970af1c9bc6dac12535b2c7125ce378eea2414 100644 (file)
--- a/speaker-test/speaker-test.c
+++ b/speaker-test/speaker-test.c
@@ -100,6 +100,7 @@ static unsigned int       period_time = 0;              /* period time in us */
 static unsigned int       nperiods    = 4;                  /* number of periods */
 static double             freq        = 440.0;              /* sinusoidal wave frequency in Hz */
 static int                test_type   = TEST_PINK_NOISE;    /* Test type. 1 = noise, 2 = sine wave */
+static float              generator_scale  = 0.8;           /* Scale to use for sine volume */
 static pink_noise_t pink;
 static snd_pcm_uframes_t  buffer_size;
 static snd_pcm_uframes_t  period_size;
@@ -306,7 +307,7 @@ static void generate_sine(uint8_t *frames, int channel, int count, double *_phas
       switch (format) {
       case SND_PCM_FORMAT_S8:
         if (chn==channel) {
-          res = (sin((phase * 2 * M_PI) / max_phase - M_PI)) * 0x03fffffff; /* Don't use MAX volume */
+          res = (sin((phase * 2 * M_PI) / max_phase - M_PI)) * generator_scale * 0x7fffffff;
           ires = res;
           *samp8++ = ires >> 24;
         } else {
@@ -315,7 +316,7 @@ static void generate_sine(uint8_t *frames, int channel, int count, double *_phas
         break;
       case SND_PCM_FORMAT_S16_LE:
         if (chn==channel) {
-          res = (sin((phase * 2 * M_PI) / max_phase - M_PI)) * 0x03fffffff; /* Don't use MAX volume */
+          res = (sin((phase * 2 * M_PI) / max_phase - M_PI)) * generator_scale * 0x7fffffff;
           ires = res;
           *samp16++ = LE_SHORT(ires >> 16);
         } else {
@@ -324,7 +325,7 @@ static void generate_sine(uint8_t *frames, int channel, int count, double *_phas
         break;
       case SND_PCM_FORMAT_S16_BE:
         if (chn==channel) {
-          res = (sin((phase * 2 * M_PI) / max_phase - M_PI)) * 0x03fffffff; /* Don't use MAX volume */
+          res = (sin((phase * 2 * M_PI) / max_phase - M_PI)) * generator_scale * 0x7fffffff;
           ires = res;
           *samp16++ = BE_SHORT(ires >> 16);
         } else {
@@ -333,7 +334,7 @@ static void generate_sine(uint8_t *frames, int channel, int count, double *_phas
         break;
       case SND_PCM_FORMAT_FLOAT_LE:
         if (chn==channel) {
-          res = (sin((phase * 2 * M_PI) / max_phase - M_PI)) * 0.75 ; /* Don't use MAX volume */
+          res = (sin((phase * 2 * M_PI) / max_phase - M_PI)) * generator_scale;
           fres = res;
          *samp_f++ = fres;
         } else {
@@ -342,7 +343,7 @@ static void generate_sine(uint8_t *frames, int channel, int count, double *_phas
         break;
       case SND_PCM_FORMAT_S32_LE:
         if (chn==channel) {
-          res = (sin((phase * 2 * M_PI) / max_phase - M_PI)) * 0x03fffffff; /* Don't use MAX volume */
+          res = (sin((phase * 2 * M_PI) / max_phase - M_PI)) * generator_scale * 0x7fffffff;
           ires = res;
           *samp32++ = LE_INT(ires);
         } else {
@@ -351,7 +352,7 @@ static void generate_sine(uint8_t *frames, int channel, int count, double *_phas
         break;
       case SND_PCM_FORMAT_S32_BE:
         if (chn==channel) {
-          res = (sin((phase * 2 * M_PI) / max_phase - M_PI)) * 0x03fffffff; /* Don't use MAX volume */
+          res = (sin((phase * 2 * M_PI) / max_phase - M_PI)) * generator_scale * 0x7fffffff;
           ires = res;
           *samp32++ = BE_INT(ires);
         } else {
@@ -389,7 +390,7 @@ static void generate_pink_noise( uint8_t *frames, int channel, int count) {
       switch (format) {
       case SND_PCM_FORMAT_S8:
         if (chn==channel) {
-         res = generate_pink_noise_sample(&pink) * 0x03fffffff; /* Don't use MAX volume */
+         res = generate_pink_noise_sample(&pink) * generator_scale * 0x07fffffff;
          ires = res;
          *samp8++ = ires >> 24;
         } else {
@@ -398,7 +399,7 @@ static void generate_pink_noise( uint8_t *frames, int channel, int count) {
         break;
       case SND_PCM_FORMAT_S16_LE:
         if (chn==channel) {
-         res = generate_pink_noise_sample(&pink) * 0x03fffffff; /* Don't use MAX volume */
+         res = generate_pink_noise_sample(&pink) * generator_scale * 0x07fffffff;
          ires = res;
           *samp16++ = LE_SHORT(ires >> 16);
         } else {
@@ -407,7 +408,7 @@ static void generate_pink_noise( uint8_t *frames, int channel, int count) {
         break;
       case SND_PCM_FORMAT_S16_BE:
         if (chn==channel) {
-          res = generate_pink_noise_sample(&pink) * 0x03fffffff; /* Don't use MAX volume */
+          res = generate_pink_noise_sample(&pink) * generator_scale * 0x07fffffff;
           ires = res;
           *samp16++ = BE_SHORT(ires >> 16);
         } else {
@@ -416,7 +417,7 @@ static void generate_pink_noise( uint8_t *frames, int channel, int count) {
         break;
       case SND_PCM_FORMAT_S32_LE:
         if (chn==channel) {
-          res = generate_pink_noise_sample(&pink) * 0x03fffffff; /* Don't use MAX volume */
+          res = generate_pink_noise_sample(&pink) * generator_scale * 0x07fffffff;
           ires = res;
           *samp32++ = LE_INT(ires);
         } else {
@@ -425,7 +426,7 @@ static void generate_pink_noise( uint8_t *frames, int channel, int count) {
         break;
       case SND_PCM_FORMAT_S32_BE:
         if (chn==channel) {
-         res = generate_pink_noise_sample(&pink) * 0x03fffffff; /* Don't use MAX volume */
+         res = generate_pink_noise_sample(&pink) * generator_scale * 0x07fffffff;
          ires = res;
          *samp32++ = BE_INT(ires);
         } else {
@@ -1017,6 +1018,7 @@ static void help(void)
           "-W,--wavdir Specify the directory containing WAV files\n"
           "-m,--chmap  Specify the channel map to override\n"
           "-X,--force-frequency        force frequencies outside the 30-8000hz range\n"
+          "-S,--scale  Scale of generated test tones in percent (default=80)\n"
           "\n"));
   printf(_("Recognized sample formats are:"));
   for (fmt = supported_formats; *fmt >= 0; fmt++) {
@@ -1060,6 +1062,7 @@ int main(int argc, char *argv[]) {
     {"wavdir",    1, NULL, 'W'},
     {"debug",    0, NULL, 'd'},
     {"force-frequency",          0, NULL, 'X'},
+    {"scale",    1, NULL, 'S'},
 #ifdef CONFIG_SUPPORT_CHMAP
     {"chmap",    1, NULL, 'm'},
 #endif
@@ -1081,7 +1084,7 @@ int main(int argc, char *argv[]) {
   while (1) {
     int c;
     
-    if ((c = getopt_long(argc, argv, "hD:r:c:f:F:b:p:P:t:l:s:w:W:d:X"
+    if ((c = getopt_long(argc, argv, "hD:r:c:f:F:b:p:P:t:l:s:w:W:d:XS:"
 #ifdef CONFIG_SUPPORT_CHMAP
                         "m:"
 #endif
@@ -1182,6 +1185,9 @@ int main(int argc, char *argv[]) {
       chmap = optarg;
       break;
 #endif
+    case 'S':
+      generator_scale = atoi(optarg) / 100.0;
+      break;
     default:
       fprintf(stderr, _("Unknown option '%c'\n"), c);
       exit(EXIT_FAILURE);