Update tinypcminfo to display format information

Change-Id: I0e6a04da5a4b122a3748b16c7eb01c4a224c3d84
Signed-off-by: Andy Hung <hunga@google.com>

1 files changed, 106 insertions, 0 deletions

diff --git a/tinypcminfo.c b/tinypcminfo.c
index 3282186..b2d11bc 100644
--- a/tinypcminfo.c
+++ b/tinypcminfo.c
@@ -31,6 +31,72 @@
 #include <stdlib.h>
 #include <string.h>
 
+#ifndef ARRAY_SIZE
+#define ARRAY_SIZE(x) (sizeof(x)/sizeof((x)[0]))
+#endif
+
+/* The format_lookup is in order of SNDRV_PCM_FORMAT_##index and
+ * matches the grouping in sound/asound.h.  Note this is not
+ * continuous and has an empty gap from (25 - 30).
+ */
+static const char *format_lookup[] = {
+        /*[0] =*/ "S8",
+        "U8",
+        "S16_LE",
+        "S16_BE",
+        "U16_LE",
+        "U16_BE",
+        "S24_LE",
+        "S24_BE",
+        "U24_LE",
+        "U24_BE",
+        "S32_LE",
+        "S32_BE",
+        "U32_LE",
+        "U32_BE",
+        "FLOAT_LE",
+        "FLOAT_BE",
+        "FLOAT64_LE",
+        "FLOAT64_BE",
+        "IEC958_SUBFRAME_LE",
+        "IEC958_SUBFRAME_BE",
+        "MU_LAW",
+        "A_LAW",
+        "IMA_ADPCM",
+        "MPEG",
+        /*[24] =*/ "GSM",
+        [31] = "SPECIAL",
+        "S24_3LE",
+        "S24_3BE",
+        "U24_3LE",
+        "U24_3BE",
+        "S20_3LE",
+        "S20_3BE",
+        "U20_3LE",
+        "U20_3BE",
+        "S18_3LE",
+        "S18_3BE",
+        "U18_3LE",
+        /*[43] =*/ "U18_3BE",
+#if 0
+        /* recent additions, may not be present on local asound.h */
+        "G723_24",
+        "G723_24_1B",
+        "G723_40",
+        "G723_40_1B",
+        "DSD_U8",
+        "DSD_U16_LE",
+#endif
+};
+
+/* Returns a human readable name for the format associated with bit_index,
+ * NULL if bit_index is not known.
+ */
+inline const char *pcm_get_format_name(unsigned bit_index)
+{
+    return bit_index < ARRAY_SIZE(format_lookup) ? format_lookup[bit_index] : NULL;
+}
+
 int main(int argc, char **argv)
 {
     unsigned int device = 0;
@@ -63,6 +129,7 @@ int main(int argc, char **argv)
 
     for (i = 0; i < 2; i++) {
         struct pcm_params *params;
+        struct pcm_mask *m;
         unsigned int min;
         unsigned int max;
 
@@ -74,6 +141,45 @@ int main(int argc, char **argv)
             continue;
         }
 
+        m = pcm_params_get_mask(params, PCM_PARAM_ACCESS);
+        if (m) { /* bitmask, refer to SNDRV_PCM_ACCESS_*, generally interleaved */
+            printf("      Access:\t%#08x\n", m->bits[0]);
+        }
+        m = pcm_params_get_mask(params, PCM_PARAM_FORMAT);
+        if (m) { /* bitmask, refer to: SNDRV_PCM_FORMAT_* */
+            unsigned j, k, count = 0;
+            const unsigned bitcount = sizeof(m->bits[0]) * 8;
+
+            /* we only check first two format masks (out of 8) - others are zero. */
+            printf("   Format[0]:\t%#08x\n", m->bits[0]);
+            printf("   Format[1]:\t%#08x\n", m->bits[1]);
+
+            /* print friendly format names, if they exist */
+            for (k = 0; k < 2; ++k) {
+                for (j = 0; j < bitcount; ++j) {
+                    const char *name;
+
+                    if (m->bits[k] & (1 << j)) {
+                        name = pcm_get_format_name(j + k*bitcount);
+                        if (name) {
+                            if (count++ == 0) {
+                                printf(" Format Name:\t");
+                            } else {
+                                printf (", ");
+                            }
+                            printf("%s", name);
+                        }
+                    }
+                }
+            }
+            if (count) {
+                printf("\n");
+            }
+        }
+        m = pcm_params_get_mask(params, PCM_PARAM_SUBFORMAT);
+        if (m) { /* bitmask, should be 1: SNDRV_PCM_SUBFORMAT_STD */
+            printf("   Subformat:\t%#08x\n", m->bits[0]);
+        }
         min = pcm_params_get_min(params, PCM_PARAM_RATE);
         max = pcm_params_get_max(params, PCM_PARAM_RATE);
         printf("        Rate:\tmin=%uHz\tmax=%uHz\n", min, max);