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160 lines
6.0 KiB
160 lines
6.0 KiB
/*****************************************************************************
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* desc_6a.h: ETSI EN 300 468 Descriptor 0x6a: AC-3 descriptor
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*****************************************************************************
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* Copyright (C) 2009-2010 VideoLAN
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*
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* Authors: Christophe Massiot <massiot@via.ecp.fr>
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* Georgi Chorbadzhiyski <georgi@unixsol.org>
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject
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* to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*****************************************************************************/
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/*
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* Normative references:
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* - ETSI EN 300 468 V1.11.1 (2010-04) (SI in DVB systems)
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*/
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#ifndef __BITSTREAM_DVB_DESC_6A_H__
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#define __BITSTREAM_DVB_DESC_6A_H__
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#include <bitstream/common.h>
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#include <bitstream/mpeg/psi/descriptors.h>
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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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/*****************************************************************************
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* Descriptor 0x6a: AC-3 descriptor
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*****************************************************************************/
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#define DESC6A_HEADER_SIZE (DESC_HEADER_SIZE + 1)
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static inline void desc6a_init(uint8_t *p_desc)
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{
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desc_set_tag(p_desc, 0x6a);
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desc_set_length(p_desc, (DESC6A_HEADER_SIZE - DESC_HEADER_SIZE));
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p_desc[2] = 0x0f;
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}
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static inline void desc6a_clear_flags(uint8_t *p_desc)
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{
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p_desc[2] = 0x0f;
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}
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#define DEFINE_AC3_FLAG(FLAGNAME, bit) \
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static inline bool desc6a_get_##FLAGNAME##_flag(const uint8_t *p_desc) \
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{ \
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return (p_desc[2] & bit) == bit; \
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} \
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\
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static inline void desc6a_set_##FLAGNAME##_flag(uint8_t *p_desc, bool b_##FLAGNAME) \
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{ \
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p_desc[2] = b_##FLAGNAME ? (p_desc[2] | bit) : (p_desc[2] &~ bit); \
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}
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#define DEFINE_AC3_VALUE(VALUENAME, ofs) \
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static inline uint8_t desc6a_get_##VALUENAME(const uint8_t *p_desc) \
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{ \
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if (!desc6a_get_##VALUENAME##_flag(p_desc)) return 0; \
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return p_desc[ofs]; \
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} \
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\
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static inline void desc6a_set_##VALUENAME(uint8_t *p_desc, uint8_t i_##VALUENAME) \
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{ \
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if (!desc6a_get_##VALUENAME##_flag(p_desc)) return; \
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p_desc[ofs] = i_##VALUENAME; \
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}
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DEFINE_AC3_FLAG (component_type, 0x80)
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DEFINE_AC3_VALUE(component_type, DESC6A_HEADER_SIZE)
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DEFINE_AC3_FLAG (bsid, 0x40)
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DEFINE_AC3_VALUE(bsid, DESC6A_HEADER_SIZE
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+ desc6a_get_component_type_flag(p_desc))
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DEFINE_AC3_FLAG (mainid, 0x20)
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DEFINE_AC3_VALUE(mainid, DESC6A_HEADER_SIZE
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+ desc6a_get_component_type_flag(p_desc)
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+ desc6a_get_bsid_flag(p_desc))
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DEFINE_AC3_FLAG (asvc, 0x10)
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DEFINE_AC3_VALUE(asvc, DESC6A_HEADER_SIZE
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+ desc6a_get_component_type_flag(p_desc)
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+ desc6a_get_bsid_flag(p_desc)
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+ desc6a_get_mainid_flag(p_desc))
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#undef DEFINE_AC3_FLAG
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#undef DEFINE_AC3_VALUE
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static inline void desc6a_set_length(uint8_t *p_desc)
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{
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uint8_t i_size = (DESC6A_HEADER_SIZE - DESC_HEADER_SIZE)
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+ desc6a_get_component_type_flag(p_desc)
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+ desc6a_get_bsid_flag(p_desc)
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+ desc6a_get_mainid_flag(p_desc)
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+ desc6a_get_asvc_flag(p_desc);
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return desc_set_length(p_desc, i_size);
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}
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static inline bool desc6a_validate(const uint8_t *p_desc)
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{
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uint8_t i_size = (DESC6A_HEADER_SIZE - DESC_HEADER_SIZE)
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+ desc6a_get_component_type_flag(p_desc)
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+ desc6a_get_bsid_flag(p_desc)
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+ desc6a_get_mainid_flag(p_desc)
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+ desc6a_get_asvc_flag(p_desc);
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return desc_get_length(p_desc) >= i_size;
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}
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static inline void desc6a_print(const uint8_t *p_desc, f_print pf_print,
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void *opaque, print_type_t i_print_type)
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{
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switch (i_print_type) {
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case PRINT_XML:
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pf_print(opaque,
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"<AC3_DESC component_type_flag=\"%u\" component_type=\"%u\""
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" bsid_flag=\"%u\" bsid=\"%u\""
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" mainid_flag=\"%u\" mainid=\"%u\""
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" asvc_flag=\"%u\" asvc=\"%u\"/>",
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desc6a_get_component_type_flag(p_desc), desc6a_get_component_type(p_desc),
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desc6a_get_bsid_flag(p_desc), desc6a_get_bsid(p_desc),
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desc6a_get_mainid_flag(p_desc), desc6a_get_mainid(p_desc),
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desc6a_get_asvc_flag(p_desc), desc6a_get_asvc(p_desc)
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);
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break;
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default:
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pf_print(opaque,
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" - desc 6a ac3 component_type_flag=%u component_type=%u"
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" bsid_flag=%u bsid=%u"
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" mainid_flag=%u mainid=%u"
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" asvc_flag=%u asvc=%u",
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desc6a_get_component_type_flag(p_desc), desc6a_get_component_type(p_desc),
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desc6a_get_bsid_flag(p_desc), desc6a_get_bsid(p_desc),
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desc6a_get_mainid_flag(p_desc), desc6a_get_mainid(p_desc),
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desc6a_get_asvc_flag(p_desc), desc6a_get_asvc(p_desc)
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);
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}
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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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