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138 lines
4.8 KiB
138 lines
4.8 KiB
/*****************************************************************************
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* desc_03.h: ISO/IEC 13818-1 Descriptor 0x03 (Audio stream descriptor)
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*****************************************************************************
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* Copyright (C) 2011 Unix Solutions Ltd.
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*
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* Authors: 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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* - ISO/IEC 13818-1:2007(E) (MPEG-2 Systems)
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*/
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#ifndef __BITSTREAM_MPEG_DESC_03_H__
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#define __BITSTREAM_MPEG_DESC_03_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 0x03: Audio stream descriptor
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*****************************************************************************/
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#define DESC03_HEADER_SIZE (DESC_HEADER_SIZE + 1)
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static inline void desc03_init(uint8_t *p_desc)
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{
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desc_set_tag(p_desc, 0x03);
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desc_set_length(p_desc, DESC03_HEADER_SIZE - DESC_HEADER_SIZE);
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p_desc[2] = 0x07;
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}
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static inline bool desc03_validate(const uint8_t *p_desc)
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{
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return desc_get_length(p_desc) >= DESC03_HEADER_SIZE - DESC_HEADER_SIZE;
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}
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static inline bool desc03_get_free_format_flag(const uint8_t *p_desc) {
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return (p_desc[2] & 0x80) == 0x80;
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}
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static inline void desc03_set_free_format_flag(uint8_t *p_desc, bool b_free_format_flag) {
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p_desc[2] = (b_free_format_flag ? (p_desc[2] | 0x80) : (p_desc[2] &~ 0x80));
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}
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static inline bool desc03_get_ID(const uint8_t *p_desc) {
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return (p_desc[2] & 0x40) == 0x40;
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}
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static inline void desc03_set_ID(uint8_t *p_desc, bool b_id) {
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p_desc[2] = (b_id ? (p_desc[2] | 0x40) : (p_desc[2] &~ 0x40));
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}
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static inline const char *desc03_get_ID_txt(const uint8_t ID) {
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return ID ? "MPEG Audio" : "Other";
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}
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static inline uint8_t desc03_get_layer(const uint8_t *p_desc) {
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return (p_desc[2] >> 4) & 0x03; /* xx11xxxx */
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}
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static inline void desc03_set_layer(uint8_t *p_desc, uint8_t i_layer) {
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p_desc[2] = (p_desc[2] & 0xcf) | ((i_layer & 0x03) << 4);
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}
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static inline const char *desc03_get_layer_txt(const uint8_t layer) {
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return layer == 0 ? "reserved" :
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layer == 1 ? "Layer III" :
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layer == 2 ? "Layer II" :
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layer == 3 ? "Layer I" : "reserved";
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}
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static inline bool desc03_get_vbr_flag(const uint8_t *p_desc) {
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return (p_desc[2] & 0x08) == 0x08;
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}
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static inline void desc03_set_vbr_flag(uint8_t *p_desc, bool b_free_format_flag) {
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p_desc[2] = (b_free_format_flag ? (p_desc[2] | 0x08) : (p_desc[2] &~ 0x08));
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}
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static inline void desc03_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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"<AUDIO_STREAM_DESC free_format_tag=\"%u\" ID=\"%u\" layer=\"%u\""
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" ID_txt=\"%s\" layer_txt=\"%s\" vbr_audio_flag=\"%u\"/>",
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desc03_get_free_format_flag(p_desc),
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desc03_get_ID(p_desc),
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desc03_get_layer(p_desc),
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desc03_get_ID_txt(desc03_get_ID(p_desc)),
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desc03_get_layer_txt(desc03_get_layer(p_desc)),
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desc03_get_vbr_flag(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 03 audio_stream free_format_tag=%u ID=%u layer=%u"
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" ID_txt=\"%s\" layer_txt=\"%s\" vbr_audio_flag=%u",
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desc03_get_free_format_flag(p_desc),
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desc03_get_ID(p_desc),
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desc03_get_layer(p_desc),
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desc03_get_ID_txt(desc03_get_ID(p_desc)),
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desc03_get_layer_txt(desc03_get_layer(p_desc)),
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desc03_get_vbr_flag(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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