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mpegts: Add support for parsing DVB Subtitling descriptor (0x59)

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Essentially works in the same vein as the iso639 descriptor code
This commit is contained in:
Edward Hervey 2013-10-11 10:21:25 +02:00
parent 0d57756512
commit f36e0bca83
2 changed files with 76 additions and 0 deletions
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67
gst-libs/gst/mpegts/gst-dvb-descriptor.c
View file

@ -284,3 +284,70 @@ gst_mpegts_descriptor_parse_dvb_short_event (const GstMpegTsDescriptor *
*text = get_encoding_and_convert ((const gchar *) data + 1, *data);
return TRUE;
}
/* GST_MTS_DESC_DVB_SUBTITLING (0x59) */
/**
* gst_mpegts_descriptor_parse_dvb_subtitling_idx:
* @descriptor: a %GST_MTS_DESC_DVB_SUBTITLING #GstMpegTsDescriptor
* @idx: Table id of the entry to parse
* @lang (out) (transfer none): 4-byte gchar array to hold the language code
* @type: (out) (transfer none) (allow-none): the type of subtitling
* @composition_page_id: (out) (transfer none) (allow-none): the composition page id
* @ancillary_page_id: (out) (transfer none) (allow-none): the ancillary page id
*
* Extracts the DVB subtitling informatio from specific table id in @descriptor.
*
* Note: Use #gst_tag_get_language_code if you want to get the the
* ISO 639-1 language code from the returned ISO 639-2 one.
*
* Returns: %TRUE if parsing succeeded, else %FALSE.
*/
gboolean
gst_mpegts_descriptor_parse_dvb_subtitling_idx (const GstMpegTsDescriptor *
descriptor, guint idx, gchar (*lang)[4], guint8 * type,
guint16 * composition_page_id, guint16 * ancillary_page_id)
{
guint8 *data;
g_return_val_if_fail (descriptor != NULL && descriptor->data != NULL, FALSE);
g_return_val_if_fail (lang != NULL, FALSE);
g_return_val_if_fail (descriptor->tag == GST_MTS_DESC_DVB_SUBTITLING, FALSE);
/* If we went too far, return FALSE */
if (descriptor->length / 8 <= idx)
return FALSE;
data = (guint8 *) descriptor->data + 2 + idx * 8;
memcpy (lang, data, 3);
(*lang)[3] = 0;
data += 3;
if (type)
*type = *data;
data += 1;
if (composition_page_id)
*composition_page_id = GST_READ_UINT16_BE (data);
data += 2;
if (ancillary_page_id)
*ancillary_page_id = GST_READ_UINT16_BE (data);
return TRUE;
}
/**
* gst_mpegts_descriptor_parse_dvb_subtitling_nb:
* @descriptor: a %GST_MTS_DESC_DVB_SUBTITLING #GstMpegTsDescriptor
*
* Returns: The number of entries in @descriptor
*/
guint
gst_mpegts_descriptor_parse_dvb_subtitling_nb (const GstMpegTsDescriptor *
descriptor)
{
g_return_val_if_fail (descriptor != NULL && descriptor->data != NULL, 0);
return descriptor->length / 8;
}

9
gst-libs/gst/mpegts/gst-dvb-descriptor.h
View file

@ -335,6 +335,15 @@ 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_SUBTITLING (0x59) */
gboolean gst_mpegts_descriptor_parse_dvb_subtitling_idx (const GstMpegTsDescriptor *descriptor,
guint idx, gchar (*lang)[4],
guint8 *type, guint16 *composition_page_id,
guint16 *ancillary_page_id);
guint gst_mpegts_descriptor_parse_dvb_subtitling_nb (const GstMpegTsDescriptor *descriptor);
/* GST_MTS_DESC_DVB_TERRESTRIAL_DELIVERY_SYSTEM (0x5A) */
/* FIXME : Implement */