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-rw-r--r--dabplussnoop.hpp133
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diff --git a/dabplussnoop.hpp b/dabplussnoop.hpp
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-/*
- Copyright (C) 2014 Matthias P. Braendli (http://www.opendigitalradio.org)
-
- This program is free software: you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation, either version 3 of the License, or
- (at your option) any later version.
-
- This program 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 General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>.
-
- dabplussnoop.cpp
- Parse DAB+ frames from a ETI file
-
- Authors:
- Matthias P. Braendli <matthias@mpb.li>
-*/
-
-/* From the spec:
-
-subchannel_index = MSC sub-channel size (kbps) / 8
-audio_super_frame_size (bytes) = subchannel_index * 110
-
-// Derived from
-// au_start[n] = au_start[n - 1] + au_size[n - 1] + 2;
-// 2 bytes for CRC
-au_size[n] = au_start[n+1] - au_start[n] - 2;
-
-he_aac_super_frame(subchannel_index)
-{
- he_aac_super_frame_header()
- {
- header_firecode 16
- rfa 1
- dac_rate 1
- sbr_flag 1
- aac_channel_mode 1
- ps_flag 1
- mpeg_surround_config 3
-
- // end of audio parameters
- if ((dac_rate == 0) && (sbr_flag == 1)) num_aus = 2;
- // AAC core sampling rate 16 kHz
- if ((dac_rate == 1) && (sbr_flag == 1)) num_aus = 3;
- // AAC core sampling rate 24 kHz
- if ((dac_rate == 0) && (sbr_flag == 0)) num_aus = 4;
- // AAC core sampling rate 32 kHz
- if ((dac_rate == 1) && (sbr_flag == 0)) num_aus = 6;
- // AAC core sampling rate 48 kHz
-
- for (n = 1; n < num_aus; n++) {
- au_start[n]; 12
- }
-
- if !((dac_rate == 1) && (sbr_flag == 1))
- alignment 4
- }
-
- for (n = 0; n < num_aus; n++) {
- au[n] 8 * au_size[n]
- au_crc[n] 16
- }
-
-}
-*/
-
-#include <stdio.h>
-#include <stdint.h>
-#include <stdlib.h>
-#include <string.h>
-#include <string>
-#include <sstream>
-#include <vector>
-#include "faad_decoder.hpp"
-
-#ifndef __DABPLUSSNOOP_H_
-#define __DABPLUSSNOOP_H_
-
-
-class DabPlusSnoop
-{
- public:
- DabPlusSnoop() :
- m_index(0),
- m_subchannel_index(0),
- m_data(0),
- m_raw_data_stream_fd(NULL) {}
-
- void set_subchannel_index(unsigned subchannel_index)
- {
- m_subchannel_index = subchannel_index;
- }
-
- void set_index(int index)
- {
- m_index = index;
- }
-
- void push(uint8_t* streamdata, size_t streamsize);
-
- void close(void);
-
- private:
- /* Data needed for FAAD */
- FaadDecoder m_faad_decoder;
- int m_index;
-
- bool m_ps_flag;
- bool m_aac_channel_mode;
- bool m_dac_rate;
- bool m_sbr_flag;
- int m_mpeg_surround_config;
-
- /* Functions */
-
- bool seek_valid_firecode(void);
- bool decode(void);
- bool extract_au(std::vector<int> au_start);
- bool analyse_au(std::vector<std::vector<uint8_t> >& aus);
-
- unsigned m_subchannel_index;
- std::vector<uint8_t> m_data;
-
- FILE* m_raw_data_stream_fd;
-};
-
-#endif
-