output/analog: add support for sound pressure level

[libsigrok.git] / output / analog.c

diff --git a/output/analog.c b/output/analog.c
index 6f3609c07435f4246e30c13609b75757e57349c5..7090d0feb42f49fd7134e17f47fcfeab9e5da3b0 100644 (file)
--- a/output/analog.c
+++ b/output/analog.c
@@ -30,7 +30,6 @@ struct context {
        GString *out;
 };
 
-
 static int init(struct sr_output *o)
 {
        struct context *ctx;
@@ -41,8 +40,10 @@ static int init(struct sr_output *o)
        if (!o || !o->sdi)
                return SR_ERR_ARG;
 
-       if (!(ctx = g_try_malloc0(sizeof(struct context))))
+       if (!(ctx = g_try_malloc0(sizeof(struct context)))) {
+               sr_err("output/analog: Context malloc failed.");
                return SR_ERR_MALLOC;
+       }
        o->internal = ctx;
 
        /* Get the number of probes and their names. */
@@ -142,6 +143,29 @@ static void fancyprint(int unit, int mqflags, float value, GString *out)
                case SR_UNIT_DECIBEL_VOLT:
                        si_printf(value, out, "dBV");
                        break;
+               case SR_UNIT_DECIBEL_SPL:
+                       if (mqflags & SR_MQFLAG_SPL_FREQ_WEIGHT_A)
+                               si_printf(value, out, "dB(A)");
+                       else if (mqflags & SR_MQFLAG_SPL_FREQ_WEIGHT_C)
+                               si_printf(value, out, "dB(C)");
+                       else if (mqflags & SR_MQFLAG_SPL_FREQ_WEIGHT_Z)
+                               si_printf(value, out, "dB(Z)");
+                       else
+                               /* No frequency weighting, or non-standard "flat" */
+                               si_printf(value, out, "dB(SPL)");
+                       if (mqflags & SR_MQFLAG_SPL_TIME_WEIGHT_S)
+                               g_string_append(out, " S");
+                       else if (mqflags & SR_MQFLAG_SPL_TIME_WEIGHT_F)
+                               g_string_append(out, " F");
+                       if (mqflags & SR_MQFLAG_SPL_LAT)
+                               g_string_append(out, " LAT");
+                       else if (mqflags & SR_MQFLAG_SPL_PCT_OVER_ALARM)
+                               /* Not a standard function for SLMs, so this is
+                                * a made-up notation. */
+                               g_string_append(out, " %oA");
+                       break;
+               default:
+                       si_printf(value, out, "");
        }
        if ((mqflags & (SR_MQFLAG_AC | SR_MQFLAG_DC)) == (SR_MQFLAG_AC | SR_MQFLAG_DC))
                g_string_append_printf(out, " AC+DC");