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author | Mark Purcell <msp@debian.org> | 2008-06-22 11:00:40 +1000 |
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committer | etobi <git@e-tobi.net> | 2013-09-03 09:48:42 +0200 |
commit | 891c51ff368ed700dec6025eeb47ce4d96f76418 (patch) | |
tree | 3729664829e4faa691d403274f38eb10890b533c /lib/libucsi/mpeg/odsmt_section.h | |
parent | 1c6e1f28f54ec2606c23936c1d8689f2be55a86c (diff) | |
parent | ab959d7b4194715870128e616b8e29d4a101e488 (diff) | |
download | linux-dvb-apps-debian/1.1.1+rev1207-1.tar.gz |
Imported Debian patch 1.1.1+rev1207-1debian/1.1.1+rev1207-1
Diffstat (limited to 'lib/libucsi/mpeg/odsmt_section.h')
-rw-r--r-- | lib/libucsi/mpeg/odsmt_section.h | 224 |
1 files changed, 224 insertions, 0 deletions
diff --git a/lib/libucsi/mpeg/odsmt_section.h b/lib/libucsi/mpeg/odsmt_section.h new file mode 100644 index 0000000..4e01085 --- /dev/null +++ b/lib/libucsi/mpeg/odsmt_section.h @@ -0,0 +1,224 @@ +/* + * 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_ODSMT_SECTION_H +#define _UCSI_MPEG_ODSMT_SECTION_H 1 + +#ifdef __cplusplus +extern "C" +{ +#endif + +#include <libucsi/section.h> + +/** + * mpeg_odsmt_section structure. + */ +struct mpeg_odsmt_section { + struct section_ext head; + + uint8_t stream_count; + /* stream_count==0 => struct mpeg_odsmt_stream_single streams + stream_count>0 => struct mpeg_odsmt_stream_multi streams[] */ + /* uint8_t object_descriptors[] */ +} __ucsi_packed; + +struct mpeg_odsmt_stream_single +{ + uint16_t esid; + uint8_t es_info_length; + /* struct descriptor descriptors[] */ +} __ucsi_packed; + +struct mpeg_odsmt_stream_multi +{ + uint16_t esid; + uint8_t fmc; + uint8_t es_info_length; + /* struct descriptor descriptors[] */ +} __ucsi_packed; + +/** + * Structure describing the stream information held in an mpeg_odsmt_section. + */ +struct mpeg_odsmt_stream { + union { + struct mpeg_odsmt_stream_single single; + struct mpeg_odsmt_stream_multi multi; + } u; +} __ucsi_packed; + +/** + * Process an mpeg_odsmt_section. + * + * @param section Pointer to the generic section_ext structure. + * @return Pointer to a mpeg_odsmt_section structure, or NULL on error. + */ +extern struct mpeg_odsmt_section *mpeg_odsmt_section_codec(struct section_ext *section); + +/** + * Accessor for the PID field of an ODSMT. + * + * @param odsmt odsmt pointer. + * @return The pid. + */ +static inline uint16_t mpeg_odsmt_section_pid(struct mpeg_odsmt_section *odsmt) +{ + return odsmt->head.table_id_ext & 0x1fff; +} + +/** + * Convenience iterator for the streams field of an mpeg_odsmt_section. + * + * @param osdmt Pointer to the mpeg_odsmt_section structure. + * @param pos Variable holding pointer to the current mpeg_odsmt_stream structure. + * @param index Variable holding the stream index. + */ +#define mpeg_odsmt_section_streams_for_each(osdmt, pos, index) \ + for (index=0, (pos) = mpeg_odsmt_section_streams_first(odsmt); \ + (pos); \ + (pos) = mpeg_odsmt_section_streams_next(odsmt, pos, ++index)) + +/** + * Convenience iterator for the descriptors field of an mpeg_odsmt_stream. + * + * @param osdmt Pointer to the mpeg_odsmt_section structure. + * @param stream Pointer to the mpeg_odsmt_stream structure. + * @param pos Variable holding pointer to the current descriptor structure. + */ +#define mpeg_odsmt_stream_descriptors_for_each(osdmt, stream, pos) \ + for ((pos) = mpeg_odsmt_stream_descriptors_first(odsmt, stream); \ + (pos); \ + (pos) = mpeg_odsmt_stream_descriptors_next(odsmt, stream, pos)) + +/** + * Retrieve a pointer to the object_descriptors field of an mpeg_odsmt_section. + * + * @param osdmt Pointer to the mpeg_odsmt_section structure. + * @param len On return, will contain the number of bytes in the object descriptors field. + * @return Pointer to the object_descriptors field, or NULL on error. + */ +static inline uint8_t* + mpeg_odsmt_section_object_descriptors(struct mpeg_odsmt_section * odsmt, + size_t* len); + + + + + + + + + + +/******************************** PRIVATE CODE ********************************/ +static inline struct mpeg_odsmt_stream * + mpeg_odsmt_section_streams_first(struct mpeg_odsmt_section *odsmt) +{ + size_t pos = sizeof(struct mpeg_odsmt_section); + + if (pos >= section_ext_length(&odsmt->head)) + return NULL; + + return (struct mpeg_odsmt_stream *) ((uint8_t *) odsmt + pos); +} + +static inline struct mpeg_odsmt_stream * + mpeg_odsmt_section_streams_next(struct mpeg_odsmt_section *odsmt, + struct mpeg_odsmt_stream *pos, + int _index) +{ + uint8_t *end = (uint8_t*) odsmt + section_ext_length(&odsmt->head); + uint8_t *next; + + if (_index > odsmt->stream_count) + return NULL; + + next = (uint8_t *) pos + sizeof(struct mpeg_odsmt_stream_multi) + + pos->u.multi.es_info_length; + + if (next >= end) + return NULL; + + return (struct mpeg_odsmt_stream *) next; +} + +static inline struct descriptor * + mpeg_odsmt_stream_descriptors_first(struct mpeg_odsmt_section *odsmt, + struct mpeg_odsmt_stream *stream) +{ + if (odsmt->stream_count == 0) { + if (stream->u.single.es_info_length == 0) + return NULL; + + return (struct descriptor *) + ((uint8_t*) stream + sizeof(struct mpeg_odsmt_stream_single)); + } else { + if (stream->u.multi.es_info_length == 0) + return NULL; + + return (struct descriptor *) + ((uint8_t*) stream + sizeof(struct mpeg_odsmt_stream_multi)); + } +} + +static inline struct descriptor * + mpeg_odsmt_stream_descriptors_next(struct mpeg_odsmt_section *odsmt, + struct mpeg_odsmt_stream *stream, + struct descriptor* pos) +{ + if (odsmt->stream_count == 0) { + return next_descriptor((uint8_t *) stream + sizeof(struct mpeg_odsmt_stream_single), + stream->u.single.es_info_length, + pos); + } else { + return next_descriptor((uint8_t *) stream + sizeof(struct mpeg_odsmt_stream_multi), + stream->u.multi.es_info_length, + pos); + } +} + +static inline uint8_t* + mpeg_odsmt_section_object_descriptors(struct mpeg_odsmt_section * odsmt, + size_t* len) +{ + struct mpeg_odsmt_stream* pos; + size_t size = sizeof(struct mpeg_odsmt_section); + int _index; + + mpeg_odsmt_section_streams_for_each(odsmt, pos, _index) { + if (odsmt->stream_count == 0) + size += sizeof(struct mpeg_odsmt_stream_single) + + pos->u.single.es_info_length; + else + size += sizeof(struct mpeg_odsmt_stream_multi) + + pos->u.multi.es_info_length; + } + + *len = section_ext_length(&odsmt->head) - size; + return (uint8_t*) odsmt + size; +} + +#ifdef __cplusplus +} +#endif + +#endif |