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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/>.
faad_decoder.h
Use libfaad to decode the AAC content of the DAB+ subchannel
Authors:
Matthias P. Braendli <matthias@mpb.li>
*/
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <string>
#include <sstream>
#include <vector>
#include <neaacdec.h>
#ifndef __FAAD_DECODER_H_
#define __FAAD_DECODER_H_
struct adts_fixed_header {
unsigned int syncword :12;
unsigned int id :1;
unsigned int layer :2;
unsigned int protection_absent :1;
unsigned int profile_objecttype :2;
unsigned int sampling_freq_idx :4;
unsigned int private_bit :1;
unsigned int channel_conf :3;
unsigned int original_copy :1;
unsigned int home :1;
};
struct adts_variable_header {
unsigned int copyright_id_bit :1;
unsigned int copyright_id_start :1;
unsigned int aac_frame_length :13;
unsigned int adts_buffer_fullness :11;
unsigned int no_raw_data_blocks :2;
};
class FaadHandle
{
public:
FaadHandle()
{
decoder = NeAACDecOpen();
}
FaadHandle(const FaadHandle& other)
{
this->decoder = NeAACDecOpen();
}
FaadHandle& operator=(const FaadHandle& other)
{
this->decoder = NeAACDecOpen();
return *this;
}
~FaadHandle()
{
NeAACDecClose(decoder);
decoder = NULL;
}
NeAACDecHandle decoder;
};
class FaadDecoder
{
public:
FaadDecoder();
void open(std::string filename, bool ps_flag, bool aac_channel_mode,
bool dac_rate, bool sbr_flag, int mpeg_surround_config);
void close(void);
bool decode(std::vector<std::vector<uint8_t> > aus);
bool is_initialised(void) { return m_initialised; }
private:
void update_header(void);
size_t m_data_len;
std::string m_filename;
FILE* m_fd;
FILE* m_aac;
/* Data needed for FAAD */
bool m_ps_flag;
bool m_aac_channel_mode;
bool m_dac_rate;
bool m_sbr_flag;
int m_mpeg_surround_config;
int m_channels;
int m_sample_rate;
bool m_initialised;
FaadHandle m_faad_handle;
};
#endif
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