lcd4linux.git - lcd4linux

Age	Commit message (Collapse)	Author	Files	Lines
2004-06-02	[lcd4linux @ 2004-06-02 05:27:59 by reinelt]	reinelt	1	-0/+59
	added documentation tree git-svn-id: https://ssl.bulix.org/svn/lcd4linux/trunk@458 3ae390bd-cb1e-0410-b409-cd5a39f66f1f

/* * 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_MPEG_ISO_639_LANGUAGE_DESCRIPTOR #define _UCSI_MPEG_ISO_639_LANGUAGE_DESCRIPTOR 1 #ifdef __cplusplus extern "C" { #endif #include <libucsi/descriptor.h> #include <libucsi/endianops.h> #include <libucsi/types.h> /** * Possible values for audio_type. */ enum { MPEG_AUDIO_TYPE_CLEAN_EFFECTS = 0x01, MPEG_AUDIO_TYPE_HEARING_IMPAIRED = 0x02, MPEG_AUDIO_TYPE_VISUAL_IMPAIRED_COMMENTARY = 0x03, }; /** * mpeg_iso_639_language_descriptor structure. */ struct mpeg_iso_639_language_descriptor { struct descriptor d; /* struct mpeg_iso_639_language_code languages[] */ } __ucsi_packed; /** * An entry in the mpeg_iso_639_language_descriptor languages field. */ struct mpeg_iso_639_language_code { iso639lang_t language_code; uint8_t audio_type; } __ucsi_packed; /** * Process an mpeg_iso_639_language_descriptor. * * @param d Generic descriptor structure. * @return Pointer to an mpeg_iso_639_language_descriptor structure, or NULL * on error. */ static inline struct mpeg_iso_639_language_descriptor* mpeg_iso_639_language_descriptor_codec(struct descriptor* d) { if (d->len % sizeof(struct mpeg_iso_639_language_code)) return NULL; return (struct mpeg_iso_639_language_descriptor*) d; } /** * Convenience iterator for the languages field of an mpeg_iso_639_language_descriptor * * @param d Pointer to the mpeg_iso_639_language_descriptor structure. * @param pos Variable holding a pointer to the current entry. */ #define mpeg_iso_639_language_descriptor_languages_for_each(_d, _pos) \ for ((_pos) = mpeg_iso_639_language_descriptor_languages_first(_d); \ (_pos); \ (_pos) = mpeg_iso_639_language_descriptor_languages_next(_d, _pos)) /******************************** PRIVATE CODE ********************************/ static inline struct mpeg_iso_639_language_code* mpeg_iso_639_language_descriptor_languages_first(struct mpeg_iso_639_language_descriptor *d) { if (d->d.len < sizeof(struct mpeg_iso_639_language_code)) return NULL; return (struct mpeg_iso_639_language_code *) ((uint8_t*) d + sizeof(struct mpeg_iso_639_language_descriptor)); } static inline struct mpeg_iso_639_language_code* mpeg_iso_639_language_descriptor_languages_next(struct mpeg_iso_639_language_descriptor *d, struct mpeg_iso_639_language_code *pos) { uint8_t *end = (uint8_t*) d + 2 + d->d.len; uint8_t *next = (uint8_t *) pos + sizeof(struct mpeg_iso_639_language_code); if (next >= end) return NULL; return (struct mpeg_iso_639_language_code *) next; } #ifdef __cplusplus } #endif #endif