diff options
Diffstat (limited to 'lib/libucsi/dvb/frequency_list_descriptor.h')
| -rw-r--r-- | lib/libucsi/dvb/frequency_list_descriptor.h | 107 |
1 files changed, 107 insertions, 0 deletions
diff --git a/lib/libucsi/dvb/frequency_list_descriptor.h b/lib/libucsi/dvb/frequency_list_descriptor.h new file mode 100644 index 0000000..4c18cec --- /dev/null +++ b/lib/libucsi/dvb/frequency_list_descriptor.h @@ -0,0 +1,107 @@ +/* + * section and descriptor parser + * + * Copyright (C) 2005 Kenneth Aafloy (kenneth@linuxtv.org) + * Copyright (C) 2005 Andrew de Quincey (adq_dvb@lidskialf.net) + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 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 + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA + */ + +#ifndef _UCSI_DVB_FREQUENCY_LIST_DESCRIPTOR +#define _UCSI_DVB_FREQUENCY_LIST_DESCRIPTOR 1 + +#ifdef __cplusplus +extern "C" +{ +#endif + +#include <libucsi/descriptor.h> +#include <libucsi/endianops.h> + +/** + * Possible values for coding_type. + */ +enum { + DVB_CODING_TYPE_SATELLITE = 0x01, + DVB_CODING_TYPE_CABLE = 0x02, + DVB_CODING_TYPE_TERRESTRIAL = 0x03, +}; + +/** + * dvb_frequency_list_descriptor structure. + */ +struct dvb_frequency_list_descriptor { + struct descriptor d; + + EBIT2(uint8_t reserved : 6; , + uint8_t coding_type : 2; ); + /* uint32_t centre_frequencies [] */ +} __ucsi_packed; + +/** + * Process a dvb_frequency_list_descriptor. + * + * @param d Pointer to a generic descriptor structure. + * @return dvb_frequency_list_descriptor pointer, or NULL on error. + */ +static inline struct dvb_frequency_list_descriptor* + dvb_frequency_list_descriptor_codec(struct descriptor* d) +{ + uint32_t pos = 0; + uint8_t* buf = (uint8_t*) d + 2; + uint32_t len = d->len; + + pos += sizeof(struct dvb_frequency_list_descriptor) - 2; + + if ((len - pos) % 4) + return NULL; + + while(pos < len) { + bswap32(buf+pos); + pos += 4; + } + + return (struct dvb_frequency_list_descriptor*) d; +} + +/** + * Accessor for the centre_frequencies field of a dvb_frequency_list_descriptor. + * + * @param d dvb_frequency_list_descriptor pointer. + * @return Pointer to the field. + */ +static inline uint32_t * + dvb_frequency_list_descriptor_centre_frequencies(struct dvb_frequency_list_descriptor *d) +{ + return (uint32_t *) ((uint8_t *) d + sizeof(struct dvb_frequency_list_descriptor)); +} + +/** + * Determine the number of entries in the centre_frequencies field of a dvb_frequency_list_descriptor. + * + * @param d dvb_frequency_list_descriptor pointer. + * @return The number of entries. + */ +static inline int + dvb_frequency_list_descriptor_centre_frequencies_count(struct dvb_frequency_list_descriptor *d) +{ + return (d->d.len - 1) >> 2; +} + +#ifdef __cplusplus +} +#endif + +#endif |