From cfb4da7215f96085ce167551382541ecdb99d4f7 Mon Sep 17 00:00:00 2001
From: Jesper Larsen <jesper.larsen@ixonos.com>
Date: Tue, 19 Nov 2013 10:50:30 +0100
Subject: [PATCH] mpegts: Support parsing of DVB Teletext descriptor

Descriptor tag is 0x56
---
 gst-libs/gst/mpegts/gst-dvb-descriptor.c | 65 ++++++++++++++++++++++++
 gst-libs/gst/mpegts/gst-dvb-descriptor.h | 24 +++++++++
 2 files changed, 89 insertions(+)

diff --git a/gst-libs/gst/mpegts/gst-dvb-descriptor.c b/gst-libs/gst/mpegts/gst-dvb-descriptor.c
index 8a22c891a8..0db9e62154 100644
--- a/gst-libs/gst/mpegts/gst-dvb-descriptor.c
+++ b/gst-libs/gst/mpegts/gst-dvb-descriptor.c
@@ -319,6 +319,71 @@ gst_mpegts_descriptor_parse_dvb_short_event (const GstMpegTsDescriptor *
   return TRUE;
 }
 
+/* GST_MTS_DESC_DVB_TELETEXT (0x56) */
+/**
+ * gst_mpegts_descriptor_parse_dvb_teletext_idx:
+ * @descriptor: a %GST_MTS_DESC_DVB_TELETEXT #GstMpegTsDescriptor
+ * @idx: The id of the teletext to get
+ * @language_code: (out) (allow-none): a 4-byte gchar array to hold language
+ * @teletext_type: (out) (allow-none): #GstMpegTsDVBTeletextType
+ * @magazine_number: (out) (allow-none):
+ * @page_number: (out) (allow-none):
+ *
+ * Parses teletext number @idx in the @descriptor. The language is in ISO639 format.
+ *
+ * Returns: FALSE on out-of-bounds and errors
+ */
+gboolean
+gst_mpegts_descriptor_parse_dvb_teletext_idx (const GstMpegTsDescriptor *
+    descriptor, guint idx, gchar (*language_code)[4],
+    GstMpegTsDVBTeletextType * teletext_type, guint8 * magazine_number,
+    guint8 * page_number)
+{
+  guint8 *data;
+
+  g_return_val_if_fail (descriptor != NULL && descriptor->data != NULL, FALSE);
+  g_return_val_if_fail (descriptor->tag == GST_MTS_DESC_DVB_TELETEXT, FALSE);
+
+  if (descriptor->length / 5 <= idx)
+    return FALSE;
+
+  data = (guint8 *) descriptor->data + 2 + idx * 5;
+
+  if (language_code) {
+    memcpy (language_code, data, 3);
+    (*language_code)[3] = 0;
+  }
+
+  if (teletext_type)
+    *teletext_type = data[3] >> 3;
+
+  if (magazine_number)
+    *magazine_number = data[3] & 0x07;
+
+  if (page_number)
+    *page_number = data[4];
+
+  return TRUE;
+}
+
+/**
+ * gst_mpegts_descriptor_parse_dvb_teletext_nb:
+ * @descriptor: a %GST_MTS_DESC_DVB_TELETEXT #GstMpegTsDescriptor
+ *
+ * Find the number of teletext entries in @descriptor
+ *
+ * Returns: Number of teletext entries
+ */
+guint
+gst_mpegts_descriptor_parse_dvb_teletext_nb (const GstMpegTsDescriptor *
+    descriptor)
+{
+  if (descriptor == NULL && descriptor->data == NULL)
+    return 0;
+
+  return descriptor->length / 5;
+}
+
 /* GST_MTS_DESC_DVB_SUBTITLING (0x59) */
 
 /**
diff --git a/gst-libs/gst/mpegts/gst-dvb-descriptor.h b/gst-libs/gst/mpegts/gst-dvb-descriptor.h
index 957dd10aea..0e429e09b4 100644
--- a/gst-libs/gst/mpegts/gst-dvb-descriptor.h
+++ b/gst-libs/gst/mpegts/gst-dvb-descriptor.h
@@ -339,6 +339,30 @@ gboolean gst_mpegts_descriptor_parse_dvb_component (const GstMpegTsDescriptor *d
 gboolean gst_mpegts_descriptor_parse_dvb_stream_identifier (const GstMpegTsDescriptor *descriptor,
 							    guint8 *component_tag);
 
+/* GST_MTS_DESC_DVB_TELETEXT (0x56) */
+/**
+ * GstMpegTsDVBTeletextType:
+ *
+ * The type of teletext page.
+ *
+ * As specified in Table 100 of ETSI EN 300 468 v1.13.1
+ */
+typedef enum {
+	INITIAL_PAGE = 0x01,
+	SUBTITLE_PAGE,
+	ADDITIONAL_INFO_PAGE,
+	PROGRAMME_SCHEDULE_PAGE,
+	HEARING_IMPAIRED_PAGE
+} GstMpegTsDVBTeletextType;
+
+gboolean gst_mpegts_descriptor_parse_dvb_teletext_idx (const GstMpegTsDescriptor *
+    descriptor, guint idx, gchar (*language_code)[4],
+    GstMpegTsDVBTeletextType * teletext_type, guint8 * magazine_number,
+    guint8 * page_number);
+
+guint gst_mpegts_descriptor_parse_dvb_teletext_nb (const GstMpegTsDescriptor *
+    descriptor);
+
 /* GST_MTS_DESC_DVB_SUBTITLING (0x59) */
 gboolean gst_mpegts_descriptor_parse_dvb_subtitling_idx (const GstMpegTsDescriptor *descriptor,
 							 guint idx, gchar (*lang)[4],