86 lines
2.6 KiB
C++
86 lines
2.6 KiB
C++
#include <stdint.h>
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#include <string>
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#include "bitstream.h"
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namespace aac {
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class adts {
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public:
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adts();
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adts(const char * _data, unsigned long _len);
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adts(const adts & rhs);
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~adts();
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adts& operator = (const adts & rhs);
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bool sameHeader(const adts & rhs) const;
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unsigned long getAACProfile() const;
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unsigned long getFrequencyIndex() const;
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unsigned long getFrequency() const;
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unsigned long getChannelConfig() const;
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unsigned long getChannelCount() const;
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unsigned long getHeaderSize() const;
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unsigned long getPayloadSize() const;
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unsigned long getCompleteSize() const;
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unsigned long getSampleCount() const;
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bool hasSync() const;
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char * getPayload();
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std::string toPrettyString() const;
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operator bool() const;
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private:
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char * data;
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unsigned long len;
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};
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class AudSpecConf{
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public:
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static inline uint32_t rate(const std::string & conf){
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Utils::bitstream bs;
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bs.append(conf.data(), conf.size());
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if (bs.get(5) == 31){bs.skip(6);}//skip object type
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switch (bs.get(4)){//frequency index
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case 0: return 96000;
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case 1: return 88200;
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case 2: return 64000;
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case 3: return 48000;
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case 4: return 44100;
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case 5: return 32000;
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case 6: return 24000;
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case 7: return 22050;
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case 8: return 16000;
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case 9: return 12000;
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case 10: return 11025;
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case 11: return 8000;
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case 12: return 7350;
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case 15: return bs.get(24);
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default: return 0;
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}
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}
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static inline uint16_t channels(const std::string & conf){
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Utils::bitstream bs;
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bs.append(conf.data(), conf.size());
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if (bs.get(5) == 31){bs.skip(6);}//skip object type
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if (bs.get(4) == 15){bs.skip(24);}//frequency index
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return bs.get(4);//channel configuration
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}
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static inline uint8_t objtype(const std::string & conf){
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Utils::bitstream bs;
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bs.append(conf.data(), conf.size());
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uint8_t ot = bs.get(5);
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if (ot == 31){return bs.get(6)+32;}
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return ot;
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}
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static inline uint16_t samples(const std::string & conf){
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Utils::bitstream bs;
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bs.append(conf.data(), conf.size());
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if (bs.get(5) == 31){bs.skip(6);}//skip object type
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if (bs.get(4) == 15){bs.skip(24);}//frequency index
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bs.skip(4);//channel configuration
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if (bs.get(1)){
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return 960;
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}else{
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return 1024;
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}
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}
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};
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}
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