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gstreamer/gst-libs/gst/mpegts/gst-dvb-descriptor.c

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/*
* gstmpegtsdescriptor.c -
* Copyright (C) 2013 Edward Hervey
*
* Authors:
* Edward Hervey <edward@collabora.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include <stdlib.h>
#include <string.h>
#include "mpegts.h"
#include "gstmpegts-private.h"
/**
* SECTION:gst-dvb-descriptor
* @title: DVB variants of MPEG-TS descriptors
* @short_description: Descriptors for the various DVB specifications
* @include: gst/mpegts/mpegts.h
*
*/
/*
* TODO
*
* * Add common validation code for data presence and minimum/maximum expected
* size.
* * Add parsing methods for the following descriptors that were previously
* handled in mpegtsbase:
* * GST_MTS_DESC_DVB_DATA_BROADCAST_ID
* * GST_MTS_DESC_DVB_CAROUSEL_IDENTIFIER
* * GST_MTS_DESC_DVB_FREQUENCY_LIST
*/
#define BCD_UN(a) ((a) & 0x0f)
#define BCD_DEC(a) (((a) >> 4) & 0x0f)
#define BCD(a) (BCD_UN(a) + 10 * BCD_DEC(a))
#define BCD_16(a) (BCD(a[1]) + 100 * BCD(a[0]))
#define BCD_28(a) (BCD_DEC(a[3]) + 10 * BCD(a[2]) + 1000 * BCD(a[1]) + 100000 * BCD(a[0]))
#define BCD_32(a) (BCD(a[3]) + 100 * BCD(a[2]) + 10000 * BCD(a[1]) + 1000000 * BCD(a[0]))
/* GST_MTS_DESC_DVB_NETWORK_NAME (0x40) */
/**
* gst_mpegts_descriptor_parse_dvb_network_name:
* @descriptor: a %GST_MTS_DESC_DVB_NETWORK_NAME #GstMpegTsDescriptor
* @name: (out) (transfer full): the extracted name
*
* Parses out the dvb network name from the @descriptor:
*
* Returns: %TRUE if the parsing happened correctly, else %FALSE.
*/
gboolean
gst_mpegts_descriptor_parse_dvb_network_name (const GstMpegTsDescriptor *
descriptor, gchar ** name)
{
g_return_val_if_fail (descriptor != NULL && name != NULL, FALSE);
/* We need at least one byte of data for the string */
__common_desc_checks (descriptor, GST_MTS_DESC_DVB_NETWORK_NAME, 1, FALSE);
*name = get_encoding_and_convert ((gchar *) descriptor->data + 2,
descriptor->data[1]);
return TRUE;
}
/**
* gst_mpegts_descriptor_from_dvb_network_name:
* @name: the network name to set
*
* Fills a #GstMpegTsDescriptor to be a %GST_MTS_DESC_DVB_NETWORK_NAME,
* with the network name @name. The data field of the #GstMpegTsDescriptor
* will be allocated, and transferred to the caller.
*
* Returns: (transfer full): the #GstMpegTsDescriptor or %NULL on fail
*/
GstMpegTsDescriptor *
gst_mpegts_descriptor_from_dvb_network_name (const gchar * name)
{
GstMpegTsDescriptor *descriptor;
guint8 *converted_name;
gsize size;
g_return_val_if_fail (name != NULL, NULL);
converted_name = dvb_text_from_utf8 (name, &size);
g_return_val_if_fail (size < 256, NULL);
if (!converted_name) {
GST_WARNING ("Could not find proper encoding for string `%s`", name);
return NULL;
}
descriptor = _new_descriptor (GST_MTS_DESC_DVB_NETWORK_NAME, size);
memcpy (descriptor->data + 2, converted_name, size);
g_free (converted_name);
return descriptor;
}
/* GST_MTS_DESC_DVB_SATELLITE_DELIVERY_SYSTEM (0x43) */
/**
* gst_mpegts_descriptor_parse_satellite_delivery_system:
* @descriptor: a %GST_MTS_DESC_DVB_SATELLITE_DELIVERY_SYSTEM #GstMpegTsDescriptor
* @res: (out) (transfer none): the #GstMpegTsSatelliteDeliverySystemDescriptor to fill
*
* Extracts the satellite delivery system information from @descriptor.
*
* Returns: %TRUE if parsing succeeded, else %FALSE.
*/
gboolean
gst_mpegts_descriptor_parse_satellite_delivery_system (const GstMpegTsDescriptor
* descriptor, GstMpegTsSatelliteDeliverySystemDescriptor * res)
{
guint8 *data;
guint8 tmp;
g_return_val_if_fail (descriptor != NULL && res != NULL, FALSE);
/* This descriptor is always 11 bytes long */
__common_desc_checks_exact (descriptor,
GST_MTS_DESC_DVB_SATELLITE_DELIVERY_SYSTEM, 11, FALSE);
data = (guint8 *) descriptor->data + 2;
/* BCD coded frequency in GHz (decimal point occurs after the 3rd character)
* So direct BCD gives us units of (GHz / 100 000) = 10 kHz*/
res->frequency = BCD_32 (data) * 10;
data += 4;
/* BCD codec position in degrees (float pointer after the 3rd character) */
res->orbital_position = (BCD_16 (data)) / 10.0;
data += 2;
tmp = *data;
res->west_east = (tmp & 0x80) == 0x80;
res->polarization = (tmp >> 7) & 0x03;
res->modulation_system = (tmp & 0x04) == 0x04;
if (res->modulation_system)
res->roll_off = (tmp >> 3 & 0x03);
else
res->roll_off = GST_MPEGTS_ROLLOFF_AUTO;
switch (tmp & 0x03) {
case 0x00:
res->modulation_type = GST_MPEGTS_MODULATION_QAM_AUTO;
break;
case 0x01:
res->modulation_type = GST_MPEGTS_MODULATION_QPSK;
break;
case 0x02:
res->modulation_type = GST_MPEGTS_MODULATION_PSK_8;
break;
case 0x03:
res->modulation_type = GST_MPEGTS_MODULATION_QAM_16;
break;
default:
res->modulation_type = GST_MPEGTS_MODULATION_QAM_AUTO;
break;
}
data += 1;
/* symbol_rate is in Msymbols/ (decimal point occurs after 3rd character) */
/* So direct BCD gives us units of (Msymbol / 10 000) = 100 sym/s */
res->symbol_rate = BCD_28 (data) * 100;
data += 3;
/* fec_inner */
switch (*data >> 4) {
case 0x01:
res->fec_inner = GST_MPEGTS_FEC_1_2;
break;
case 0x02:
res->fec_inner = GST_MPEGTS_FEC_2_3;
break;
case 0x03:
res->fec_inner = GST_MPEGTS_FEC_3_4;
break;
case 0x04:
res->fec_inner = GST_MPEGTS_FEC_5_6;
break;
case 0x05:
res->fec_inner = GST_MPEGTS_FEC_7_8;
break;
case 0x06:
res->fec_inner = GST_MPEGTS_FEC_8_9;
break;
case 0x07:
res->fec_inner = GST_MPEGTS_FEC_3_5;
break;
case 0x08:
res->fec_inner = GST_MPEGTS_FEC_4_5;
break;
case 0x09:
res->fec_inner = GST_MPEGTS_FEC_9_10;
break;
case 0x0f:
res->fec_inner = GST_MPEGTS_FEC_NONE;
break;
default:
res->fec_inner = GST_MPEGTS_FEC_AUTO;
break;
}
return TRUE;
}
/* GST_MTS_DESC_DVB_CABLE_DELIVERY_SYSTEM (0x44) */
/**
* gst_mpegts_descriptor_parse_cable_delivery_system:
* @descriptor: a %GST_MTS_DESC_DVB_CABLE_DELIVERY_SYSTEM #GstMpegTsDescriptor
* @res: (out) (transfer none): the #GstMpegTsCableDeliverySystemDescriptor to fill
*
* Extracts the cable delivery system information from @descriptor.
*
* Returns: %TRUE if parsing succeeded, else %FALSE.
*/
gboolean
gst_mpegts_descriptor_parse_cable_delivery_system (const GstMpegTsDescriptor *
descriptor, GstMpegTsCableDeliverySystemDescriptor * res)
{
guint8 *data;
g_return_val_if_fail (descriptor != NULL && res != NULL, FALSE);
/* This descriptor is always 11 bytes long */
__common_desc_checks_exact (descriptor,
GST_MTS_DESC_DVB_CABLE_DELIVERY_SYSTEM, 11, FALSE);
data = (guint8 *) descriptor->data + 2;
/* BCD in MHz, decimal place after the fourth character */
res->frequency = BCD_32 (data) * 100;
data += 5;
/* fec_out (4bits) */
res->outer_fec = *data++ & 0x0f;
switch (*data) {
case 0x00:
res->modulation = GST_MPEGTS_MODULATION_NONE;
break;
case 0x01:
res->modulation = GST_MPEGTS_MODULATION_QAM_16;
break;
case 0x02:
res->modulation = GST_MPEGTS_MODULATION_QAM_32;
break;
case 0x03:
res->modulation = GST_MPEGTS_MODULATION_QAM_64;
break;
case 0x04:
res->modulation = GST_MPEGTS_MODULATION_QAM_128;
break;
case 0x05:
res->modulation = GST_MPEGTS_MODULATION_QAM_256;
break;
default:
GST_WARNING ("Unsupported cable modulation type: 0x%02x", *data);
res->modulation = GST_MPEGTS_MODULATION_NONE;
break;
}
data += 1;
/* symbol_rate is in Msymbols/ (decimal point occurs after 3rd character) */
/* So direct BCD gives us units of (Msymbol / 10 000) = 100 sym/s */
res->symbol_rate = BCD_28 (data) * 100;
data += 3;
/* fec_inner */
switch (*data & 0xf) {
case 0x00:
res->fec_inner = GST_MPEGTS_FEC_AUTO;
break;
case 0x01:
res->fec_inner = GST_MPEGTS_FEC_1_2;
break;
case 0x02:
res->fec_inner = GST_MPEGTS_FEC_2_3;
break;
case 0x03:
res->fec_inner = GST_MPEGTS_FEC_3_4;
break;
case 0x04:
res->fec_inner = GST_MPEGTS_FEC_5_6;
break;
case 0x05:
res->fec_inner = GST_MPEGTS_FEC_7_8;
break;
case 0x06:
res->fec_inner = GST_MPEGTS_FEC_8_9;
break;
case 0x07:
res->fec_inner = GST_MPEGTS_FEC_3_5;
break;
case 0x08:
res->fec_inner = GST_MPEGTS_FEC_4_5;
break;
case 0x09:
res->fec_inner = GST_MPEGTS_FEC_9_10;
break;
case 0x0f:
res->fec_inner = GST_MPEGTS_FEC_NONE;
break;
default:
res->fec_inner = GST_MPEGTS_FEC_AUTO;
break;
}
return TRUE;
}
/* GST_MTS_DESC_DVB_SERVICE (0x48) */
/**
* gst_mpegts_descriptor_parse_dvb_service:
* @descriptor: a %GST_MTS_DESC_DVB_SERVICE #GstMpegTsDescriptor
* @service_type: (out) (allow-none): the service type
* @service_name: (out) (transfer full) (allow-none): the service name
* @provider_name: (out) (transfer full) (allow-none): the provider name
*
* Extracts the dvb service information from @descriptor.
*
* Returns: %TRUE if parsing succeeded, else %FALSE.
*/
gboolean
gst_mpegts_descriptor_parse_dvb_service (const GstMpegTsDescriptor *
descriptor, GstMpegTsDVBServiceType * service_type, gchar ** service_name,
gchar ** provider_name)
{
guint8 *data;
g_return_val_if_fail (descriptor != NULL, FALSE);
/* Need at least 3 bytes (type and 2 bytes for the string length) */
__common_desc_checks (descriptor, GST_MTS_DESC_DVB_SERVICE, 3, FALSE);
data = (guint8 *) descriptor->data + 2;
if (service_type)
*service_type = *data;
data += 1;
if (provider_name)
*provider_name = get_encoding_and_convert ((const gchar *) data + 1, *data);
data += *data + 1;
if (service_name)
*service_name = get_encoding_and_convert ((const gchar *) data + 1, *data);
return TRUE;
}
/**
* gst_mpegts_descriptor_from_dvb_service:
* @service_type: Service type defined as a #GstMpegTsDVBServiceType
* @service_name: (allow-none): Name of the service
* @service_provider: (allow-none): Name of the service provider
*
* Fills a #GstMpegTsDescriptor to be a %GST_MTS_DESC_DVB_SERVICE.
* The data field of the #GstMpegTsDescriptor will be allocated,
* and transferred to the caller.
*
* Returns: (transfer full): the #GstMpgTsDescriptor or %NULL on fail
*/
GstMpegTsDescriptor *
gst_mpegts_descriptor_from_dvb_service (GstMpegTsDVBServiceType service_type,
const gchar * service_name, const gchar * service_provider)
{
GstMpegTsDescriptor *descriptor;
guint8 *conv_provider_name = NULL, *conv_service_name = NULL;
gsize provider_size = 0, service_size = 0;
guint8 *data;
if (service_provider) {
conv_provider_name = dvb_text_from_utf8 (service_provider, &provider_size);
if (!conv_provider_name) {
GST_WARNING ("Could not find proper encoding for string `%s`",
service_provider);
return NULL;
}
}
if (provider_size >= 256) {
g_free (conv_provider_name);
g_return_val_if_reached (NULL);
}
if (service_name) {
conv_service_name = dvb_text_from_utf8 (service_name, &service_size);
if (!conv_service_name) {
GST_WARNING ("Could not find proper encoding for string `%s`",
service_name);
return NULL;
}
}
if (service_size >= 256) {
g_free (conv_provider_name);
g_free (conv_service_name);
g_return_val_if_reached (NULL);
}
descriptor =
_new_descriptor (GST_MTS_DESC_DVB_SERVICE,
3 + provider_size + service_size);
data = descriptor->data + 2;
*data++ = service_type;
*data++ = provider_size;
memcpy (data, conv_provider_name, provider_size);
data += provider_size;
*data++ = service_size;
memcpy (data, conv_service_name, service_size);
g_free (conv_provider_name);
g_free (conv_service_name);
return descriptor;
}
/* GST_MTS_DESC_DVB_LINKAGE (0x4A) */
static void
_gst_mpegts_dvb_linkage_extened_event_free (GstMpegTsDVBLinkageExtendedEvent *
item)
{
g_slice_free (GstMpegTsDVBLinkageExtendedEvent, item);
}
/**
* gst_mpegts_descriptor_parse_dvb_linkage:
* @descriptor: a %GST_MTS_DESC_DVB_LINKAGE #GstMpegTsDescriptor
* @res: (out) (transfer none): the #GstMpegTsDVBLinkageDescriptor to fill
*
* Extracts the DVB linkage information from @descriptor.
*
* Returns: %TRUE if parsing succeeded, else %FALSE.
*/
gboolean
gst_mpegts_descriptor_parse_dvb_linkage (const GstMpegTsDescriptor * descriptor,
GstMpegTsDVBLinkageDescriptor * res)
{
guint8 *data, *end;
g_return_val_if_fail (descriptor != NULL && res != NULL, FALSE);
__common_desc_checks (descriptor, GST_MTS_DESC_DVB_LINKAGE, 7, FALSE);
data = (guint8 *) descriptor->data + 2;
end = data + descriptor->length;
res->transport_stream_id = GST_READ_UINT16_BE (data);
data += 2;
res->original_network_id = GST_READ_UINT16_BE (data);
data += 2;
res->service_id = GST_READ_UINT16_BE (data);
data += 2;
res->linkage_type = *data;
data += 1;
switch (res->linkage_type) {
case GST_MPEGTS_DVB_LINKAGE_MOBILE_HAND_OVER:{
GstMpegTsDVBLinkageMobileHandOver *hand_over;
if (end - data < 1)
return FALSE;
hand_over = g_slice_new0 (GstMpegTsDVBLinkageMobileHandOver);
res->linkage_data = (gpointer) hand_over;
hand_over->origin_type = (*data >> 7) & 0x01;
hand_over->hand_over_type = *data & 0x0f;
data += 1;
if (hand_over->hand_over_type ==
GST_MPEGTS_DVB_LINKAGE_HAND_OVER_IDENTICAL
|| hand_over->hand_over_type ==
GST_MPEGTS_DVB_LINKAGE_HAND_OVER_LOCAL_VARIATION
|| hand_over->hand_over_type ==
GST_MPEGTS_DVB_LINKAGE_HAND_OVER_ASSOCIATED) {
if (end - data < 2) {
g_slice_free (GstMpegTsDVBLinkageMobileHandOver, hand_over);
res->linkage_data = NULL;
return FALSE;
}
hand_over->network_id = GST_READ_UINT16_BE (data);
data += 2;
}
if (hand_over->origin_type == 0) {
if (end - data < 2) {
g_slice_free (GstMpegTsDVBLinkageMobileHandOver, hand_over);
res->linkage_data = NULL;
return FALSE;
}
hand_over->initial_service_id = GST_READ_UINT16_BE (data);
data += 2;
}
break;
}
case GST_MPEGTS_DVB_LINKAGE_EVENT:{
GstMpegTsDVBLinkageEvent *event;
if (end - data < 3)
return FALSE;
event = g_slice_new0 (GstMpegTsDVBLinkageEvent);
res->linkage_data = (gpointer) event;
event->target_event_id = GST_READ_UINT16_BE (data);
data += 2;
event->target_listed = *data & 0x01;
event->event_simulcast = (*data >> 1) & 0x01;
data += 1;
break;
}
case GST_MPEGTS_DVB_LINKAGE_EXTENDED_EVENT:{
GPtrArray *ext_events;
ext_events = g_ptr_array_new_with_free_func ((GDestroyNotify)
_gst_mpegts_dvb_linkage_extened_event_free);
res->linkage_data = (gpointer) ext_events;
for (guint8 i = 0; i < *data++;) {
GstMpegTsDVBLinkageExtendedEvent *ext_event;
if (end - data < 3)
goto fail;
ext_event = g_slice_new0 (GstMpegTsDVBLinkageExtendedEvent);
g_ptr_array_add (res->linkage_data, ext_event);
ext_event->target_event_id = GST_READ_UINT16_BE (data);
data += 2;
i += 2;
ext_event->target_listed = *data & 0x01;
ext_event->event_simulcast = (*data >> 1) & 0x01;
ext_event->link_type = (*data >> 3) & 0x03;
ext_event->target_id_type = (*data >> 5) & 0x03;
ext_event->original_network_id_flag = (*data >> 6) & 0x01;
ext_event->service_id_flag = (*data >> 7) & 0x01;
data += 1;
i += 1;
if (ext_event->target_id_type == 3) {
if (end - data < 2)
goto fail;
ext_event->user_defined_id = GST_READ_UINT16_BE (data);
data += 2;
i += 2;
} else {
if (ext_event->target_id_type == 1) {
if (end - data < 2)
goto fail;
ext_event->target_transport_stream_id = GST_READ_UINT16_BE (data);
data += 2;
i += 2;
}
if (ext_event->original_network_id_flag) {
if (end - data < 2)
goto fail;
ext_event->target_original_network_id = GST_READ_UINT16_BE (data);
data += 2;
i += 2;
}
if (ext_event->service_id_flag) {
if (end - data < 2)
goto fail;
ext_event->target_service_id = GST_READ_UINT16_BE (data);
data += 2;
i += 2;
}
}
}
break;
}
default:
break;
}
res->private_data_length = end - data;
res->private_data_bytes = g_memdup (data, res->private_data_length);
return TRUE;
fail:
g_ptr_array_unref (res->linkage_data);
res->linkage_data = NULL;
return FALSE;
}
/* GST_MTS_DESC_DVB_SHORT_EVENT (0x4D) */
/**
* gst_mpegts_descriptor_parse_dvb_short_event:
* @descriptor: a %GST_MTS_DESC_DVB_SHORT_EVENT #GstMpegTsDescriptor
* @language_code: (out) (transfer full) (allow-none): the language code
* @event_name: (out) (transfer full) (allow-none): the event name
* @text: (out) (transfer full) (allow-none): the event text
*
* Extracts the DVB short event information from @descriptor.
*
* Returns: %TRUE if parsing succeeded, else %FALSE.
*/
gboolean
gst_mpegts_descriptor_parse_dvb_short_event (const GstMpegTsDescriptor *
descriptor, gchar ** language_code, gchar ** event_name, gchar ** text)
{
guint8 *data;
g_return_val_if_fail (descriptor != NULL, FALSE);
/* Need at least 5 bytes (3 for language code, 2 for each string length) */
__common_desc_checks (descriptor, GST_MTS_DESC_DVB_SHORT_EVENT, 5, FALSE);
data = (guint8 *) descriptor->data + 2;
if (language_code) {
*language_code = g_malloc0 (4);
memcpy (*language_code, data, 3);
}
data += 3;
if (event_name)
*event_name = get_encoding_and_convert ((const gchar *) data + 1, *data);
data += *data + 1;
if (text)
*text = get_encoding_and_convert ((const gchar *) data + 1, *data);
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, FALSE);
__common_desc_checks (descriptor, GST_MTS_DESC_DVB_TELETEXT, 0, 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)
{
g_return_val_if_fail (descriptor != NULL, 0);
__common_desc_checks (descriptor, GST_MTS_DESC_DVB_TELETEXT, 0, 0);
return descriptor->length / 5;
}
/* 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 && lang != NULL, FALSE);
__common_desc_checks (descriptor, GST_MTS_DESC_DVB_SUBTITLING, 0, 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, FALSE);
__common_desc_checks (descriptor, GST_MTS_DESC_DVB_SUBTITLING, 0, FALSE);
return descriptor->length / 8;
}
/**
* gst_mpegts_descriptor_from_dvb_subtitling:
* @lang: (transfer none): a string containing the ISO639 language
* @type: subtitling type
* @composition: composition page id
* @ancillary: ancillary page id
*/
GstMpegTsDescriptor *
gst_mpegts_descriptor_from_dvb_subtitling (const gchar * lang,
guint8 type, guint16 composition, guint16 ancillary)
{
GstMpegTsDescriptor *descriptor;
guint8 *data;
g_return_val_if_fail (lang != NULL, NULL);
descriptor = _new_descriptor (GST_MTS_DESC_DVB_SUBTITLING, 8);
data = descriptor->data + 2;
memcpy (data, lang, 3);
data += 3;
*data++ = type;
GST_WRITE_UINT16_BE (data, composition);
data += 2;
GST_WRITE_UINT16_BE (data, ancillary);
return descriptor;
}
/* GST_MTS_DESC_DVB_EXTENDED_EVENT (0x4E) */
static void
_gst_mpegts_extended_event_item_free (GstMpegTsExtendedEventItem * item)
{
g_slice_free (GstMpegTsExtendedEventItem, item);
}
/**
* gst_mpegts_descriptor_parse_dvb_extended_event:
* @descriptor: a %GST_MTS_DESC_DVB_EXTENDED_EVENT #GstMpegTsDescriptor
* @res: (out) (transfer none): the #GstMpegTsExtendedEventDescriptor to fill
*
* Extracts the DVB extended event information from @descriptor.
*
* Returns: %TRUE if parsing succeeded, else %FALSE.
*/
gboolean
gst_mpegts_descriptor_parse_dvb_extended_event (const GstMpegTsDescriptor
* descriptor, GstMpegTsExtendedEventDescriptor * res)
{
guint8 *data, *desc_data;
guint8 tmp, len_item;
GstMpegTsExtendedEventItem *item;
guint i;
g_return_val_if_fail (descriptor != NULL && res != NULL, FALSE);
/* Need at least 6 bytes (1 for desc number, 3 for language code, 2 for the loop length) */
__common_desc_checks (descriptor, GST_MTS_DESC_DVB_EXTENDED_EVENT, 6, FALSE);
data = (guint8 *) descriptor->data + 2;
tmp = *data;
res->descriptor_number = tmp >> 4;
res->last_descriptor_number = tmp & 0x0f;
data += 1;
memcpy (data, res->language_code, 3);
data += 3;
len_item = *data;
data += 1;
res->nb_items = 0;
res->items = g_ptr_array_new_with_free_func ((GDestroyNotify)
_gst_mpegts_extended_event_item_free);
for (i = 0; i < len_item;) {
desc_data = data;
item = g_slice_new0 (GstMpegTsExtendedEventItem);
item->item_description =
get_encoding_and_convert ((const gchar *) desc_data + 1, *desc_data);
desc_data += *desc_data + 1;
i += *desc_data + 1;
item->item =
get_encoding_and_convert ((const gchar *) desc_data + 1, *desc_data);
desc_data += *desc_data + 1;
i += *desc_data + 1;
g_ptr_array_add (res->items, item);
res->nb_items += 1;
}
data += len_item;
res->text = get_encoding_and_convert ((const gchar *) data + 1, *data);
return TRUE;
}
/* GST_MTS_DESC_DVB_COMPONENT (0x50) */
/**
* gst_mpegts_descriptor_parse_dvb_component:
* @descriptor: a %GST_MTS_DESC_DVB_COMPONENT #GstMpegTsDescriptor
* @res: (out) (transfer none): the #GstMpegTsComponentDescriptor to fill
*
* Extracts the DVB component information from @descriptor.
*
* Returns: %TRUE if parsing succeeded, else %FALSE.
*/
gboolean
gst_mpegts_descriptor_parse_dvb_component (const GstMpegTsDescriptor
* descriptor, GstMpegTsComponentDescriptor * res)
{
guint8 *data;
guint8 len;
g_return_val_if_fail (descriptor != NULL && res != NULL, FALSE);
/* Need 6 bytes at least (1 for content, 1 for type, 1 for tag, 3 for language code) */
__common_desc_checks (descriptor, GST_MTS_DESC_DVB_COMPONENT, 6, FALSE);
data = (guint8 *) descriptor->data + 2;
res->stream_content = *data & 0x0f;
data += 1;
res->component_type = *data;
data += 1;
res->component_tag = *data;
data += 1;
memcpy (data, res->language_code, 3);
data += 3;
len = descriptor->length - 6;
if (len)
res->text = get_encoding_and_convert ((const gchar *) data, len);
return TRUE;
}
/* GST_MTS_DESC_DVB_STREAM_IDENTIFIER (0x52) */
/**
* gst_mpegts_descriptor_parse_dvb_stream_identifier:
* @descriptor: a %GST_MTS_DESC_DVB_CONTENT #GstMpegTsDescriptor
* @component_tag: (out) (transfer none): the component tag
*
* Extracts the component tag from @descriptor.
*
* Returns: %TRUE if the parsing happended correctly, else %FALSE.
*/
gboolean
gst_mpegts_descriptor_parse_dvb_stream_identifier (const GstMpegTsDescriptor
* descriptor, guint8 * component_tag)
{
guint8 *data;
g_return_val_if_fail (descriptor != NULL && component_tag != NULL, FALSE);
__common_desc_checks_exact (descriptor, GST_MTS_DESC_DVB_STREAM_IDENTIFIER,
1, FALSE);
data = (guint8 *) descriptor->data + 2;
*component_tag = *data;
return TRUE;
}
/* GST_MTS_DESC_DVB_CA_IDENTIFIER (0x53) */
/**
* gst_mpegts_descriptor_parse_dvb_ca_identifier:
* @descriptor: a %GST_MTS_DESC_DVB_CA_IDENTIFIER #GstMpegTsDescriptor
* @list: (out) (transfer none) (element-type guint16): This 16-bit field
* identifies the CA system. Allocations of the value of this field are found
* in http://www.dvbservices.com
*
* Extracts ca id's from @descriptor.
*
* Returns: %TRUE if the parsing happened correctly, else %FALSE.
*/
gboolean
gst_mpegts_descriptor_parse_dvb_ca_identifier (const GstMpegTsDescriptor *
descriptor, GArray ** list)
{
guint8 *data;
guint16 tmp;
g_return_val_if_fail (descriptor != NULL && list != NULL, FALSE);
/* 2 bytes = one entry */
__common_desc_checks (descriptor, GST_MTS_DESC_DVB_CA_IDENTIFIER, 2, FALSE);
data = (guint8 *) descriptor->data + 2;
*list = g_array_new (FALSE, FALSE, sizeof (guint16));
for (guint i = 0; i < descriptor->length - 1; i += 2) {
tmp = GST_READ_UINT16_BE (data);
g_array_append_val (*list, tmp);
data += 2;
}
return TRUE;
}
/* GST_MTS_DESC_DVB_CONTENT (0x54) */
static void
_gst_mpegts_content_free (GstMpegTsContent * content)
{
g_slice_free (GstMpegTsContent, content);
}
/**
* gst_mpegts_descriptor_parse_dvb_content:
* @descriptor: a %GST_MTS_DESC_DVB_CONTENT #GstMpegTsDescriptor
* @content: (out) (transfer none) (element-type GstMpegTsContent): #GstMpegTsContent
*
* Extracts the DVB content information from @descriptor.
*
* Returns: %TRUE if the parsing happened correctly, else %FALSE.
*/
gboolean
gst_mpegts_descriptor_parse_dvb_content (const GstMpegTsDescriptor
* descriptor, GPtrArray ** content)
{
guint8 *data;
guint8 len, tmp;
guint8 i;
g_return_val_if_fail (descriptor != NULL && content != NULL, FALSE);
__common_desc_checks (descriptor, GST_MTS_DESC_DVB_CONTENT, 0, FALSE);
data = (guint8 *) descriptor->data + 2;
len = descriptor->length;
*content = g_ptr_array_new_with_free_func ((GDestroyNotify)
_gst_mpegts_content_free);
for (i = 0; i < len;) {
GstMpegTsContent *cont = g_slice_new0 (GstMpegTsContent);
tmp = *data;
cont->content_nibble_1 = (tmp & 0xf0) >> 4;
cont->content_nibble_2 = tmp & 0x0f;
data += 1;
cont->user_byte = *data;
data += 1;
i += 2;
g_ptr_array_add (*content, cont);
}
return TRUE;
}
/* GST_MTS_DESC_DVB_PARENTAL_RATING (0x55) */
static void
_gst_mpegts_dvb_parental_rating_item_free (GstMpegTsDVBParentalRatingItem *
item)
{
g_slice_free (GstMpegTsDVBParentalRatingItem, item);
}
/**
* gst_mpegts_descriptor_parse_dvb_parental_rating:
* @descriptor: a %GST_MTS_DESC_DVB_PARENTAL_RATING #GstMpegTsDescriptor
* @rating: (out) (transfer none) (element-type GstMpegTsDVBParentalRatingItem):
* #GstMpegTsDVBParentalRatingItem
*
* Extracts the DVB parental rating information from @descriptor.
*
* Returns: %TRUE if the parsing happened correctly, else %FALSE.
*/
gboolean
gst_mpegts_descriptor_parse_dvb_parental_rating (const GstMpegTsDescriptor
* descriptor, GPtrArray ** rating)
{
guint8 *data;
g_return_val_if_fail (descriptor != NULL && rating != NULL, FALSE);
__common_desc_checks (descriptor, GST_MTS_DESC_DVB_PARENTAL_RATING, 0, FALSE);
data = (guint8 *) descriptor->data + 2;
*rating = g_ptr_array_new_with_free_func ((GDestroyNotify)
_gst_mpegts_dvb_parental_rating_item_free);
for (guint8 i = 0; i < descriptor->length - 3; i += 4) {
GstMpegTsDVBParentalRatingItem *item =
g_slice_new0 (GstMpegTsDVBParentalRatingItem);
g_ptr_array_add (*rating, item);
memcpy (data, item->country_code, 3);
data += 3;
if (g_strcmp0 (item->country_code, "BRA") == 0) {
/* brasil */
switch (*data & 0xf) {
case 1:
item->rating = 6;
break;
case 2:
item->rating = 10;
break;
case 3:
item->rating = 12;
break;
case 4:
item->rating = 14;
break;
case 5:
item->rating = 16;
break;
case 6:
item->rating = 18;
break;
default:
item->rating = 0;
break;
}
} else {
item->rating = (*data & 0xf) + 3;
}
data += 1;
}
return TRUE;
}
/* GST_MTS_DESC_DVB_TERRESTRIAL_DELIVERY_SYSTEM (0x5A) */
/**
* gst_mpegts_descriptor_parse_terrestrial_delivery_system:
* @descriptor: a %GST_MTS_DESC_DVB_TERRESTRIAL_DELIVERY_SYSTEM #GstMpegTsDescriptor
* @res: (out) (transfer none): #GstMpegTsTerrestrialDeliverySystemDescriptor
*
* Parses out the terrestrial delivery system from the @descriptor.
*
* Returns: %TRUE if the parsing happened correctly, else %FALSE.
*/
gboolean
gst_mpegts_descriptor_parse_terrestrial_delivery_system (const
GstMpegTsDescriptor * descriptor,
GstMpegTsTerrestrialDeliverySystemDescriptor * res)
{
guint8 *data;
guint8 tmp;
g_return_val_if_fail (descriptor != NULL && res != NULL, FALSE);
/* Descriptor is always 11 bytes long */
__common_desc_checks_exact (descriptor,
GST_MTS_DESC_DVB_TERRESTRIAL_DELIVERY_SYSTEM, 11, FALSE);
data = (guint8 *) descriptor->data + 2;
res->frequency = 0;
res->frequency = GST_READ_UINT32_BE (data);
res->frequency *= 10;
data += 4;
tmp = *data;
switch ((tmp >> 5) & 0x07) {
case 0:
res->bandwidth = 8000000;
break;
case 1:
res->bandwidth = 7000000;
break;
case 2:
res->bandwidth = 6000000;
break;
case 3:
res->bandwidth = 5000000;
break;
default:
res->bandwidth = 0;
break;
}
res->priority = (tmp >> 4) & 0x01;
res->time_slicing = (tmp >> 3) & 0x01;
res->mpe_fec = (tmp >> 2) & 0x01;
data += 1;
tmp = *data;
switch ((tmp >> 6) & 0x03) {
case 0:
res->constellation = GST_MPEGTS_MODULATION_QPSK;
break;
case 1:
res->constellation = GST_MPEGTS_MODULATION_QAM_16;
break;
case 2:
res->constellation = GST_MPEGTS_MODULATION_QAM_64;
break;
default:
break;
}
switch ((tmp >> 3) & 0x07) {
case 0:
res->hierarchy = GST_MPEGTS_HIERARCHY_NONE;
break;
case 1:
res->hierarchy = GST_MPEGTS_HIERARCHY_1;
break;
case 2:
res->hierarchy = GST_MPEGTS_HIERARCHY_2;
break;
case 3:
res->hierarchy = GST_MPEGTS_HIERARCHY_4;
break;
case 4:
res->hierarchy = GST_MPEGTS_HIERARCHY_NONE;
break;
case 5:
res->hierarchy = GST_MPEGTS_HIERARCHY_1;
break;
case 6:
res->hierarchy = GST_MPEGTS_HIERARCHY_2;
break;
case 7:
res->hierarchy = GST_MPEGTS_HIERARCHY_4;
break;
default:
break;
}
switch (tmp & 0x07) {
case 0:
res->code_rate_hp = GST_MPEGTS_FEC_1_2;
break;
case 1:
res->code_rate_hp = GST_MPEGTS_FEC_2_3;
break;
case 2:
res->code_rate_hp = GST_MPEGTS_FEC_3_4;
break;
case 3:
res->code_rate_hp = GST_MPEGTS_FEC_5_6;
break;
case 4:
res->code_rate_hp = GST_MPEGTS_FEC_7_8;
break;
default:
break;
}
data += 1;
tmp = *data;
switch ((tmp >> 5) & 0x07) {
case 0:
res->code_rate_lp = GST_MPEGTS_FEC_1_2;
break;
case 1:
res->code_rate_lp = GST_MPEGTS_FEC_2_3;
break;
case 2:
res->code_rate_lp = GST_MPEGTS_FEC_3_4;
break;
case 3:
res->code_rate_lp = GST_MPEGTS_FEC_5_6;
break;
case 4:
res->code_rate_lp = GST_MPEGTS_FEC_7_8;
break;
default:
break;
}
switch ((tmp >> 3) & 0x03) {
case 0:
res->guard_interval = GST_MPEGTS_GUARD_INTERVAL_1_32;
break;
case 1:
res->guard_interval = GST_MPEGTS_GUARD_INTERVAL_1_16;
break;
case 2:
res->guard_interval = GST_MPEGTS_GUARD_INTERVAL_1_8;
break;
case 3:
res->guard_interval = GST_MPEGTS_GUARD_INTERVAL_1_4;
break;
default:
break;
}
switch ((tmp >> 1) & 0x03) {
case 0:
res->transmission_mode = GST_MPEGTS_TRANSMISSION_MODE_2K;
break;
case 1:
res->transmission_mode = GST_MPEGTS_TRANSMISSION_MODE_8K;
break;
case 2:
res->transmission_mode = GST_MPEGTS_TRANSMISSION_MODE_4K;
break;
default:
break;
}
res->other_frequency = tmp & 0x01;
return TRUE;
}
/* GST_MTS_DESC_DVB_PRIVATE_DATA_SPECIFIER (0x5F) */
/**
* gst_mpegts_descriptor_parse_dvb_private_data_specifier:
* @descriptor: a %GST_MTS_DESC_DVB_PRIVATE_DATA_SPECIFIER #GstMpegTsDescriptor
* @private_data_specifier: (out): the private data specifier id
* registered by http://www.dvbservices.com/
* @private_data: (out): additional data or NULL
* @length: (out): length of %private_data
*
* Parses out the private data specifier from the @descriptor.
*
* Returns: %TRUE if the parsing happened correctly, else %FALSE.
*/
gboolean
gst_mpegts_descriptor_parse_dvb_private_data_specifier (const
GstMpegTsDescriptor * descriptor, guint32 * private_data_specifier,
guint8 ** private_data, guint8 * length)
{
guint8 *data;
g_return_val_if_fail (descriptor != NULL
&& private_data_specifier != NULL, FALSE);
__common_desc_checks (descriptor,
GST_MTS_DESC_DVB_PRIVATE_DATA_SPECIFIER, 4, FALSE);
data = (guint8 *) descriptor->data + 2;
*private_data_specifier = GST_READ_UINT32_BE (data);
*length = descriptor->length - 4;
*private_data = g_memdup (data + 4, *length);
return TRUE;
}
/* GST_MTS_DESC_DVB_FREQUENCY_LIST (0x62) */
/**
* gst_mpegts_descriptor_parse_dvb_frequency_list:
* @descriptor: a %GST_MTS_DESC_DVB_FREQUENCY_LIST #GstMpegTsDescriptor
* @offset: (out): %FALSE in Hz, %TRUE in kHz
* @list: (out): a list of all frequencies in Hz/kHz depending from %offset
*
* Parses out a list of frequencies from the @descriptor.
*
* Returns: %TRUE if the parsing happened correctly, else %FALSE.
*/
gboolean
gst_mpegts_descriptor_parse_dvb_frequency_list (const GstMpegTsDescriptor
* descriptor, gboolean * offset, GArray ** list)
{
guint8 *data, type, len;
guint32 freq;
g_return_val_if_fail (descriptor != NULL && offset != NULL &&
list != NULL, FALSE);
/* 1 byte coding system, 4 bytes each frequency entry */
__common_desc_checks (descriptor, GST_MTS_DESC_DVB_FREQUENCY_LIST, 5, FALSE);
data = (guint8 *) descriptor->data + 2;
type = *data & 0x03;
data += 1;
if (type == 1) {
/* satellite */
*offset = TRUE;
} else {
/* cable, terrestrial */
*offset = FALSE;
}
*list = g_array_new (FALSE, FALSE, sizeof (guint32));
len = descriptor->length - 1;
for (guint8 i = 0; i < len - 3; i += 4) {
switch (type) {
case 1:
freq = BCD_32 (data) * 10;
break;
case 2:
freq = BCD_32 (data) * 100;
break;
case 3:
freq = GST_READ_UINT32_BE (data) * 10;
break;
default:
break;
}
g_array_append_val (*list, freq);
data += 4;
}
return TRUE;
}
/* GST_MTS_DESC_DVB_DATA_BROADCAST (0x64) */
/**
* gst_mpegts_descriptor_parse_dvb_data_broadcast:
* @descriptor: a %GST_MTS_DESC_DVB_DATA_BROADCAST #GstMpegTsDescriptor
* @res: (out) (transfer none): #GstMpegTsDataBroadcastDescriptor
*
* Parses out the data broadcast from the @descriptor.
*
* Returns: %TRUE if the parsing happened correctly, else %FALSE.
*/
gboolean
gst_mpegts_descriptor_parse_dvb_data_broadcast (const GstMpegTsDescriptor
* descriptor, GstMpegTsDataBroadcastDescriptor * res)
{
guint8 *data;
guint8 len;
g_return_val_if_fail (descriptor != NULL && res != NULL, FALSE);
__common_desc_checks (descriptor, GST_MTS_DESC_DVB_DATA_BROADCAST, 8, FALSE);
data = (guint8 *) descriptor->data + 2;
res->data_broadcast_id = GST_READ_UINT16_BE (data);
data += 2;
res->component_tag = *data;
data += 1;
len = *data;
data += 1;
res->selector_bytes = g_memdup (data, len);
data += len;
memcpy (data, res->language_code, 3);
data += 3;
res->text = get_encoding_and_convert ((const gchar *) data + 1, *data);
return TRUE;
}
/* GST_MTS_DESC_DVB_SCRAMBLING (0x65) */
/**
* gst_mpegts_descriptor_parse_dvb_scrambling:
* @descriptor: a %GST_MTS_DESC_DVB_SCRAMBLING #GstMpegTsDescriptor
* @scrambling_mode: (out): This 8-bit field identifies the selected
* mode of the scrambling algorithm (#GstMpegTsDVBScramblingModeType).
* The technical details of the scrambling algorithm are available only
* to bona-fide users upon signature of a Non Disclosure Agreement (NDA)
* administered by the DVB Common Scrambling Algorithm Custodian.
*
* Parses out the scrambling mode from the @descriptor.
*
* Returns: %TRUE if the parsing happened correctly, else %FALSE.
*/
gboolean
gst_mpegts_descriptor_parse_dvb_scrambling (const GstMpegTsDescriptor *
descriptor, GstMpegTsDVBScramblingModeType * scrambling_mode)
{
guint8 *data;
g_return_val_if_fail (descriptor != NULL && scrambling_mode != NULL, FALSE);
__common_desc_checks_exact (descriptor, GST_MTS_DESC_DVB_SCRAMBLING, 1,
FALSE);
data = (guint8 *) descriptor->data + 2;
*scrambling_mode = *data;
return TRUE;
}
/* GST_MTS_DESC_DVB_DATA_BROADCAST_ID (0x66) */
/**
* gst_mpegts_descriptor_parse_dvb_data_broadcast_id:
* @descriptor: a %GST_MTS_DESC_DVB_DATA_BROADCAST_ID #GstMpegTsDescriptor
* @data_broadcast_id: (out): the data broadcast id
* @id_selector_bytes: (out): the selector bytes, if present
* @len: (out): the length of #id_selector_bytes
*
* Parses out the data broadcast id from the @descriptor.
*
* Returns: %TRUE if the parsing happened correctly, else %FALSE.
*/
gboolean
gst_mpegts_descriptor_parse_dvb_data_broadcast_id (const GstMpegTsDescriptor
* descriptor, guint16 * data_broadcast_id, guint8 ** id_selector_bytes,
guint8 * len)
{
guint8 *data;
g_return_val_if_fail (descriptor != NULL && data_broadcast_id != NULL &&
id_selector_bytes != NULL, FALSE);
__common_desc_checks (descriptor, GST_MTS_DESC_DVB_DATA_BROADCAST_ID, 2,
FALSE);
data = (guint8 *) descriptor->data + 2;
*data_broadcast_id = GST_READ_UINT16_BE (data);
data += 2;
*len = descriptor->length - 2;
*id_selector_bytes = g_memdup (data, *len);
return TRUE;
}
/* GST_MTS_DESC_EXT_DVB_T2_DELIVERY_SYSTEM (0x7F && 0x04) */
static void
_gst_mpegts_t2_delivery_system_cell_extension_free
(GstMpegTsT2DeliverySystemCellExtension * ext)
{
g_slice_free (GstMpegTsT2DeliverySystemCellExtension, ext);
}
static void
_gst_mpegts_t2_delivery_system_cell_free (GstMpegTsT2DeliverySystemCell * cell)
{
g_ptr_array_unref (cell->sub_cells);
g_slice_free (GstMpegTsT2DeliverySystemCell, cell);
}
/**
* gst_mpegts_descriptor_parse_dvb_t2_delivery_system:
* @descriptor: a %GST_MTS_DESC_EXT_DVB_T2_DELIVERY_SYSTEM #GstMpegTsDescriptor
* @res: (out) (transfer none): #GstMpegTsT2DeliverySystemDescriptor
*
* Parses out the DVB-T2 delivery system from the @descriptor.
*
* Returns: %TRUE if the parsing happened correctly, else %FALSE.
*/
gboolean
gst_mpegts_descriptor_parse_dvb_t2_delivery_system (const GstMpegTsDescriptor
* descriptor, GstMpegTsT2DeliverySystemDescriptor * res)
{
guint8 *data;
guint8 len, freq_len, sub_cell_len;
guint32 tmp_freq;
guint8 i;
g_return_val_if_fail (descriptor != NULL && res != NULL, FALSE);
__common_desc_ext_checks (descriptor, GST_MTS_DESC_EXT_DVB_T2_DELIVERY_SYSTEM,
4, FALSE);
data = (guint8 *) descriptor->data + 3;
res->plp_id = *data;
data += 1;
res->t2_system_id = GST_READ_UINT16_BE (data);
data += 2;
if (descriptor->length > 4) {
// FIXME: siso / miso
res->siso_miso = (*data >> 6) & 0x03;
switch ((*data >> 2) & 0x0f) {
case 0:
res->bandwidth = 8000000;
break;
case 1:
res->bandwidth = 7000000;
break;
case 2:
res->bandwidth = 6000000;
break;
case 3:
res->bandwidth = 5000000;
break;
case 4:
res->bandwidth = 10000000;
break;
case 5:
res->bandwidth = 1712000;
break;
default:
res->bandwidth = 0;
break;
}
data += 1;
switch ((*data >> 5) & 0x07) {
case 0:
res->guard_interval = GST_MPEGTS_GUARD_INTERVAL_1_32;
break;
case 1:
res->guard_interval = GST_MPEGTS_GUARD_INTERVAL_1_16;
break;
case 2:
res->guard_interval = GST_MPEGTS_GUARD_INTERVAL_1_8;
break;
case 3:
res->guard_interval = GST_MPEGTS_GUARD_INTERVAL_1_4;
break;
case 4:
res->guard_interval = GST_MPEGTS_GUARD_INTERVAL_1_128;
break;
case 5:
res->guard_interval = GST_MPEGTS_GUARD_INTERVAL_19_128;
break;
case 6:
res->guard_interval = GST_MPEGTS_GUARD_INTERVAL_19_256;
break;
default:
break;
}
switch ((*data >> 2) & 0x07) {
case 0:
res->transmission_mode = GST_MPEGTS_TRANSMISSION_MODE_2K;
break;
case 1:
res->transmission_mode = GST_MPEGTS_TRANSMISSION_MODE_8K;
break;
case 2:
res->transmission_mode = GST_MPEGTS_TRANSMISSION_MODE_4K;
break;
case 3:
res->transmission_mode = GST_MPEGTS_TRANSMISSION_MODE_1K;
break;
case 4:
res->transmission_mode = GST_MPEGTS_TRANSMISSION_MODE_16K;
break;
case 5:
res->transmission_mode = GST_MPEGTS_TRANSMISSION_MODE_32K;
break;
default:
break;
}
res->other_frequency = (*data >> 1) & 0x01;
res->tfs = (*data) & 0x01;
data += 1;
len = descriptor->length - 6;
res->cells = g_ptr_array_new_with_free_func ((GDestroyNotify)
_gst_mpegts_t2_delivery_system_cell_free);
for (i = 0; i < len;) {
GstMpegTsT2DeliverySystemCell *cell;
guint8 j, k;
cell = g_slice_new0 (GstMpegTsT2DeliverySystemCell);
g_ptr_array_add (res->cells, cell);
cell->cell_id = GST_READ_UINT16_BE (data);
data += 2;
i += 2;
cell->centre_frequencies = g_array_new (FALSE, FALSE, sizeof (guint32));
if (res->tfs == TRUE) {
freq_len = *data;
data += 1;
i += 1;
for (j = 0; j < freq_len;) {
tmp_freq = GST_READ_UINT32_BE (data) * 10;
g_array_append_val (cell->centre_frequencies, tmp_freq);
data += 4;
j += 4;
i += 4;
}
} else {
tmp_freq = GST_READ_UINT32_BE (data) * 10;
g_array_append_val (cell->centre_frequencies, tmp_freq);
data += 4;
i += 4;
}
sub_cell_len = (*data);
data += 1;
i += 1;
cell->sub_cells = g_ptr_array_new_with_free_func ((GDestroyNotify)
_gst_mpegts_t2_delivery_system_cell_extension_free);
for (k = 0; k < sub_cell_len;) {
GstMpegTsT2DeliverySystemCellExtension *cell_ext;
cell_ext = g_slice_new0 (GstMpegTsT2DeliverySystemCellExtension);
cell_ext->cell_id_extension = *data;
data += 1;
cell_ext->transposer_frequency = GST_READ_UINT32_BE (data) * 10;
data += 4;
i += 5;
k += 5;
}
}
}
return TRUE;
}
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