mpegtsmux: write language descriptor when language is available

Adds a new function to mpegts lib to create a iso639 language
descriptor from a language and use it in mpegtsmux to add
a language descriptor to audio streams that have a language set.

https://bugzilla.gnome.org/show_bug.cgi?id=763647

2 files changed, 25 insertions, 0 deletions

diff --git a/gst-libs/gst/mpegts/gstmpegtsdescriptor.c b/gst-libs/gst/mpegts/gstmpegtsdescriptor.c
index d4817d24c..a49ce2a2c 100644
--- a/gst-libs/gst/mpegts/gstmpegtsdescriptor.c
+++ b/gst-libs/gst/mpegts/gstmpegtsdescriptor.c
@@ -1040,6 +1040,30 @@ gst_mpegts_descriptor_parse_iso_639_language_nb (const GstMpegtsDescriptor *
 }
 
 /**
+ * gst_mpegts_descriptor_from_iso_639_language:
+ * @language: (transfer none): ISO-639-2 language 3-char code
+ *
+ * Creates a %GST_MTS_DESC_ISO_639_LANGUAGE #GstMpegtsDescriptor with
+ * a single language
+ *
+ * Return: #GstMpegtsDescriptor, %NULL on failure
+ */
+GstMpegtsDescriptor *
+gst_mpegts_descriptor_from_iso_639_language (const gchar * language)
+{
+  GstMpegtsDescriptor *descriptor;
+
+  g_return_val_if_fail (language != NULL, NULL);
+
+  descriptor = _new_descriptor (GST_MTS_DESC_ISO_639_LANGUAGE, 4 + 4);  /* a language takes 4 bytes */
+
+  memcpy (descriptor->data + 2, language, 3);
+  descriptor->data[2 + 3] = 0;  /* set audio type to undefined */
+
+  return descriptor;
+}
+
+/**
  * gst_mpegts_descriptor_parse_logical_channel:
  * @descriptor: a %GST_MTS_DESC_DTG_LOGICAL_CHANNEL #GstMpegtsDescriptor
  * @res: (out) (transfer none): the #GstMpegtsLogicalChannelDescriptor to fill
diff --git a/gst-libs/gst/mpegts/gstmpegtsdescriptor.h b/gst-libs/gst/mpegts/gstmpegtsdescriptor.h
index af56be0fa..33d46f5db 100644
--- a/gst-libs/gst/mpegts/gstmpegtsdescriptor.h
+++ b/gst-libs/gst/mpegts/gstmpegtsdescriptor.h
@@ -313,6 +313,7 @@ gboolean gst_mpegts_descriptor_parse_iso_639_language_idx (const GstMpegtsDescri
                                                            guint idx, gchar **lang,
                                                            GstMpegtsIso639AudioType *audio_type);
 guint gst_mpegts_descriptor_parse_iso_639_language_nb (const GstMpegtsDescriptor *descriptor);
+GstMpegtsDescriptor * gst_mpegts_descriptor_from_iso_639_language (const gchar * language);