1 files changed, 70 insertions, 0 deletions
diff --git a/gst-libs/gst/audio/gstaudioutilsprivate.c b/gst-libs/gst/audio/gstaudioutilsprivate.c
index 870bcd6b3..27b056bcb 100644
--- a/gst-libs/gst/audio/gstaudioutilsprivate.c
+++ b/gst-libs/gst/audio/gstaudioutilsprivate.c
@@ -142,3 +142,73 @@ done:
 
   return fcaps;
 }
+
+/**
+ * __gst_audio_encoded_audio_convert:
+ * @fmt: audio format of the encoded audio
+ * @bytes: number of encoded bytes
+ * @samples: number of encoded samples
+ * @src_format: source format
+ * @src_value: source value
+ * @dest_format: destination format
+ * @dest_value: destination format
+ *
+ * Helper function to convert @src_value in @src_format to @dest_value in
+ * @dest_format for encoded audio data.  Conversion is possible between
+ * BYTE and TIME format by using estimated bitrate based on
+ * @samples and @bytes (and @fmt).
+ */
+gboolean
+__gst_audio_encoded_audio_convert (GstAudioInfo * fmt,
+    gint64 bytes, gint64 samples, GstFormat src_format,
+    gint64 src_value, GstFormat * dest_format, gint64 * dest_value)
+{
+  gboolean res = FALSE;
+
+  g_return_val_if_fail (dest_format != NULL, FALSE);
+  g_return_val_if_fail (dest_value != NULL, FALSE);
+
+  if (G_UNLIKELY (src_format == *dest_format || src_value == 0 ||
+          src_value == -1)) {
+    if (dest_value)
+      *dest_value = src_value;
+    return TRUE;
+  }
+
+  if (samples == 0 || bytes == 0 || fmt->rate == 0) {
+    GST_DEBUG ("not enough metadata yet to convert");
+    goto exit;
+  }
+
+  bytes *= fmt->rate;
+
+  switch (src_format) {
+    case GST_FORMAT_BYTES:
+      switch (*dest_format) {
+        case GST_FORMAT_TIME:
+          *dest_value = gst_util_uint64_scale (src_value,
+              GST_SECOND * samples, bytes);
+          res = TRUE;
+          break;
+        default:
+          res = FALSE;
+      }
+      break;
+    case GST_FORMAT_TIME:
+      switch (*dest_format) {
+        case GST_FORMAT_BYTES:
+          *dest_value = gst_util_uint64_scale (src_value, bytes,
+              samples * GST_SECOND);
+          res = TRUE;
+          break;
+        default:
+          res = FALSE;
+      }
+      break;
+    default:
+      res = FALSE;
+  }
+
+exit:
+  return res;
+}