oss4: don't iterate the formats table twice for each entry

When iterating the formats table, we can just pass the whole
entry to our helper function, which avoids iterating the table
again to find the entry structure from the passed format id.

sys/oss4/oss4-audio.c

@@ -45,7 +45,7 @@ GST_DEBUG_CATEGORY (oss4_debug);
 
 #define GST_CAT_DEFAULT oss4_debug
 
-static const struct
+typedef struct
 {
   const GstBufferFormat gst_fmt;
   const gint oss_fmt;
@@ -54,7 +54,10 @@ static const struct
   const gint width;
   const gint endianness;
   const gboolean signedness;
-} fmt_map[] = {
+} GstOss4AudioFormat;
+
+/* *INDENT-OFF* */
+static const GstOss4AudioFormat fmt_map[] = {
   /* note: keep sorted by preference, prefered formats first */
   {
   GST_MU_LAW, AFMT_MU_LAW, "audio/x-mulaw", 0, 0, 0, FALSE}, {
@@ -72,6 +75,7 @@ static const struct
   GST_S8, AFMT_S8, "audio/x-raw-int", 8, 8, 0, TRUE}, {
   GST_U8, AFMT_U8, "audio/x-raw-int", 8, 8, 0, FALSE}
 };
+/* *INDENT-ON* */
 
 /* formats we assume the OSS4 layer can always handle and convert internally */
 #define CONVERTIBLE_FORMATS (   \
@@ -83,27 +87,18 @@ static const struct
     AFMT_U16_LE | AFMT_U16_BE | \
     AFMT_S8 | AFMT_U8 )
 
-static gboolean
-gst_oss4_append_format_to_caps (gint fmt, GstCaps * caps)
+static void
+gst_oss4_append_format_to_caps (const GstOss4AudioFormat * fmt, GstCaps * caps)
 {
-  gint i;
+  GstStructure *s;
 
-  for (i = 0; i < G_N_ELEMENTS (fmt_map); ++i) {
-    if (fmt_map[i].oss_fmt == fmt) {
-      GstStructure *s;
-
-      s = gst_structure_empty_new (fmt_map[i].name);
-      if (fmt_map[i].width != 0 && fmt_map[i].depth != 0) {
-        gst_structure_set (s, "width", G_TYPE_INT, fmt_map[i].width,
-            "depth", G_TYPE_INT, fmt_map[i].depth, "endianness", G_TYPE_INT,
-            fmt_map[i].endianness, "signed", G_TYPE_BOOLEAN,
-            fmt_map[i].signedness, NULL);
-      }
-      gst_caps_append_structure (caps, s);
-      return TRUE;
-    }
+  s = gst_structure_empty_new (fmt->name);
+  if (fmt->width != 0 && fmt->depth != 0) {
+    gst_structure_set (s, "width", G_TYPE_INT, fmt->width,
+        "depth", G_TYPE_INT, fmt->depth, "endianness", G_TYPE_INT,
+        fmt->endianness, "signed", G_TYPE_BOOLEAN, fmt->signedness, NULL);
   }
-  return FALSE;
+  gst_caps_append_structure (caps, s);
 }
 
 static gint
@@ -441,7 +436,7 @@ gst_oss4_audio_probe_caps (GstObject * obj, int fd)
   /* first list all the formats natively supported */
   for (i = 0; i < G_N_ELEMENTS (fmt_map); ++i) {
     if ((formats & fmt_map[i].oss_fmt)) {
-      gst_oss4_append_format_to_caps (fmt_map[i].oss_fmt, caps);
+      gst_oss4_append_format_to_caps (&fmt_map[i], caps);
     } else if ((fmt_map[i].oss_fmt & CONVERTIBLE_FORMATS)) {
       nonnative_formats |= fmt_map[i].oss_fmt;
     }
@@ -453,7 +448,7 @@ gst_oss4_audio_probe_caps (GstObject * obj, int fd)
   /* now append non-native formats for which conversion would be needed */
   for (i = 0; i < G_N_ELEMENTS (fmt_map); ++i) {
     if ((nonnative_formats & fmt_map[i].oss_fmt)) {
-      gst_oss4_append_format_to_caps (fmt_map[i].oss_fmt, caps);
+      gst_oss4_append_format_to_caps (&fmt_map[i], caps);
     }
   }
 
@@ -501,7 +496,7 @@ gst_oss4_audio_get_template_caps (void)
   caps = gst_caps_new_empty ();
 
   for (i = 0; i < G_N_ELEMENTS (fmt_map); ++i) {
-    gst_oss4_append_format_to_caps (fmt_map[i].oss_fmt, caps);
+    gst_oss4_append_format_to_caps (&fmt_map[i], caps);
   }
 
   gst_caps_do_simplify (caps);