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117 lines
3.2 KiB
117 lines
3.2 KiB
/*
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* section and descriptor parser
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*
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* Copyright (C) 2005 Kenneth Aafloy (kenneth@linuxtv.org)
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* Copyright (C) 2005 Andrew de Quincey (adq_dvb@lidskialf.net)
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#ifndef _UCSI_DVB_S2_SATELLITE_DELIVERY_DESCRIPTOR
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#define _UCSI_DVB_S2_SATELLITE_DELIVERY_DESCRIPTOR 1
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#ifdef __cplusplus
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extern "C"
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{
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#endif
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#include <libucsi/descriptor.h>
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#include <libucsi/endianops.h>
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/**
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* dvb_s2_satellite_delivery_descriptor structure.
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*/
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struct dvb_s2_satellite_delivery_descriptor {
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struct descriptor d;
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EBIT4(uint8_t scrambling_sequence_selector : 1; ,
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uint8_t multiple_input_stream : 1; ,
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uint8_t backwards_compatability : 1; ,
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uint8_t reserved : 5; );
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/* uint32_t scrambling_sequence_index if scrambling_sequence_selector = 1 */
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/* uint8_t input_stream_id if multiple_input_stream = 1 */
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} __ucsi_packed;
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/**
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* Process a dvb_s2_satellite_delivery_descriptor.
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*
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* @param d Pointer to a generic descriptor structure.
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* @return dvb_s2_satellite_delivery_descriptor pointer, or NULL on error.
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*/
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static inline struct dvb_s2_satellite_delivery_descriptor*
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dvb_s2_satellite_delivery_descriptor_codec(struct descriptor* d)
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{
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struct dvb_s2_satellite_delivery_descriptor *s2 =
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(struct dvb_s2_satellite_delivery_descriptor*) d;
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if (d->len < (sizeof(struct dvb_s2_satellite_delivery_descriptor) - 2))
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return NULL;
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int len = sizeof(struct dvb_s2_satellite_delivery_descriptor);
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if (s2->scrambling_sequence_selector) {
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len += 3;
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}
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if (s2->multiple_input_stream) {
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len += 1;
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}
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if (d->len < len)
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return NULL;
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return s2;
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}
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/**
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* Accessor for the scrambling_sequence_index field of a dvb_s2_satellite_delivery_descriptor.
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*
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* @param s2 dvb_s2_satellite_delivery_descriptor pointer.
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* @return The scrambling_sequence_index.
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*/
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static inline uint32_t dvb_s2_satellite_delivery_descriptor_scrambling_sequence_index(struct dvb_s2_satellite_delivery_descriptor *s2)
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{
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uint8_t *tmp = (uint8_t*) s2;
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if (s2->scrambling_sequence_selector) {
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return ((tmp[4] & 0x03) << 16) | (tmp[5] << 8) | tmp[6];
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}
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return 0;
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}
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/**
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* Accessor for the input_stream_id field of a dvb_s2_satellite_delivery_descriptor.
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*
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* @param s2 dvb_s2_satellite_delivery_descriptor pointer.
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* @return The input_stream_id.
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*/
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static inline uint8_t dvb_s2_satellite_delivery_descriptor_input_stream_id(struct dvb_s2_satellite_delivery_descriptor *s2)
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{
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uint8_t *tmp = (uint8_t*) s2;
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if (!s2->multiple_input_stream)
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return 0;
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int off = 3;
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if (s2->scrambling_sequence_selector) {
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off += 3;
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}
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return tmp[off];
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}
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#ifdef __cplusplus
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}
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#endif
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#endif
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