From ab959d7b4194715870128e616b8e29d4a101e488 Mon Sep 17 00:00:00 2001 From: etobi Date: Tue, 3 Sep 2013 09:48:41 +0200 Subject: Imported Upstream version 1.1.1+rev1207 --- lib/libucsi/dvb/vbi_data_descriptor.h | 186 ++++++++++++++++++++++++++++++++++ 1 file changed, 186 insertions(+) create mode 100644 lib/libucsi/dvb/vbi_data_descriptor.h (limited to 'lib/libucsi/dvb/vbi_data_descriptor.h') diff --git a/lib/libucsi/dvb/vbi_data_descriptor.h b/lib/libucsi/dvb/vbi_data_descriptor.h new file mode 100644 index 0000000..b1d8703 --- /dev/null +++ b/lib/libucsi/dvb/vbi_data_descriptor.h @@ -0,0 +1,186 @@ +/* + * 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_VBI_DATA_DESCRIPTOR +#define _UCSI_DVB_VBI_DATA_DESCRIPTOR 1 + +#ifdef __cplusplus +extern "C" +{ +#endif + +#include +#include + +/** + * Possible values for the data_service_id field. + */ +enum { + DVB_VBI_DATA_SERVICE_ID_EBU = 0x01, + DVB_VBI_DATA_SERVICE_ID_INVERTED = 0x02, + DVB_VBI_DATA_SERVICE_ID_VPS = 0x04, + DVB_VBI_DATA_SERVICE_ID_WSS = 0x05, + DVB_VBI_DATA_SERVICE_ID_CC = 0x06, + DVB_VBI_DATA_SERVICE_ID_MONO_422 = 0x07, +}; + +/** + * dvb_vbi_data_descriptor structure + */ +struct dvb_vbi_data_descriptor { + struct descriptor d; + + /* struct dvb_vbi_data_entry entries[] */ +} __ucsi_packed; + +/** + * An entry in the dvb_vbi_data_descriptor entries field. + */ +struct dvb_vbi_data_entry { + uint8_t data_service_id; + uint8_t data_length; + /* uint8_t data[] */ +} __ucsi_packed; + +/** + * Format of the dvb_vbi_data_entry data field, if data_service_id == 1,2,4,5,6,7. + */ +struct dvb_vbi_data_x { + EBIT3(uint8_t reserved : 2; , + uint8_t field_parity : 1; , + uint8_t line_offset : 5; ); +} __ucsi_packed; + +/** + * Process a dvb_vbi_data_descriptor. + * + * @param d Generic descriptor structure. + * @return dvb_vbi_data_descriptor pointer, or NULL on error. + */ +static inline struct dvb_vbi_data_descriptor* + dvb_vbi_data_descriptor_codec(struct descriptor* d) +{ + uint8_t* p = (uint8_t*) d + 2; + uint32_t pos = 0; + uint32_t len = d->len; + + while(pos < len) { + struct dvb_vbi_data_entry *e = + (struct dvb_vbi_data_entry*) (p+pos); + + pos += sizeof(struct dvb_vbi_data_entry); + + if (pos > len) + return NULL; + + pos += e->data_length; + + if (pos > len) + return NULL; + } + + return (struct dvb_vbi_data_descriptor*) d; +} + +/** + * Iterator for entries field in a dvb_vbi_data_descriptor structure. + * + * @param d Pointer to dvb_vbi_data_descriptor structure. + * @param pos Variable holding pointer to the current dvb_vbi_data_entry structure. + */ +#define dvb_vbi_data_descriptor_entries_for_each(d, pos) \ + for ((pos) = dvb_vbi_data_descriptor_entries_first(d); \ + (pos); \ + (pos) = dvb_vbi_data_descriptor_entries_next(d, pos)) + +/** + * Get a pointer to the data field of a dvb_vbi_data_entry. + * + * @param d dvb_vbi_data_entry structure. + * @return Pointer to the data field. + */ +static inline uint8_t * + dvb_vbi_data_entry_data(struct dvb_vbi_data_entry *d) +{ + return (uint8_t *) d + sizeof(struct dvb_vbi_data_entry); +} + +/** + * Get a pointer to the data field of a dvb_vbi_data_x for id 1,2,4,5,6,7. + * + * @param d dvb_vbi_data_entry structure. + * @return Pointer to the data field, or NULL if invalid + */ +static inline struct dvb_vbi_data_x* + dvb_vbi_data_entry_data_x(struct dvb_vbi_data_entry *d) +{ + switch(d->data_service_id) { + case 1: + case 2: + case 4: + case 5: + case 6: + case 7: + return (struct dvb_vbi_data_x*) ((uint8_t *) d + sizeof(struct dvb_vbi_data_entry)); + } + + return NULL; +} + + + + + + + + + + +/******************************** PRIVATE CODE ********************************/ +static inline struct dvb_vbi_data_entry* + dvb_vbi_data_descriptor_entries_first(struct dvb_vbi_data_descriptor *d) +{ + if (d->d.len == 0) + return NULL; + + return (struct dvb_vbi_data_entry *) + ((uint8_t*) d + sizeof(struct dvb_vbi_data_descriptor)); +} + +static inline struct dvb_vbi_data_entry* + dvb_vbi_data_descriptor_entries_next(struct dvb_vbi_data_descriptor *d, + struct dvb_vbi_data_entry *pos) +{ + uint8_t *end = (uint8_t*) d + 2 + d->d.len; + uint8_t *next = (uint8_t *) pos + sizeof(struct dvb_vbi_data_entry) + + pos->data_length; + + if (next >= end) + return NULL; + + return (struct dvb_vbi_data_entry *) next; +} + +#ifdef __cplusplus +} +#endif + +#endif -- cgit v1.2.3