45 lines
1.5 KiB
C++
45 lines
1.5 KiB
C++
#include <stdint.h>
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#include <string>
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namespace Mpeg{
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const static double sampleRates[2][3] ={{44.1, 48.0, 32.0},{22.05, 24.0, 16.0}};
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const static int sampleCounts[2][3] ={{374, 1152, 1152},{384, 1152, 576}};
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const static int bitRates[2][3][16] ={
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{{0, 32, 64, 96, 128, 160, 192, 224, 256, 288, 320, 352, 384, 416, 448, -1},
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{0, 32, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320, 384, -1},
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{0, 32, 40, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320, -1}},
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{{0, 32, 48, 56, 64, 80, 96, 112, 128, 144, 160, 176, 192, 224, 256, -1},
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{0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144, 160, -1},
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{0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144, 160, -1}}};
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struct MP2Info{
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uint64_t sampleRate;
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uint8_t channels;
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uint8_t layer;
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};
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MP2Info parseMP2Header(const std::string &hdr);
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MP2Info parseMP2Header(const char *hdr);
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const static double frameRate[16] ={
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0, 24000.0 / 1001, 24, 25, 30000.0 / 1001, 30, 50, 60000.0 / 1001, 60, 0, 0, 0, 0, 0, 0, 0};
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class MPEG2Info{
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public:
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MPEG2Info(){clear();}
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void clear();
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uint64_t width;
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uint64_t height;
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double fps;
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uint16_t tempSeq;
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uint8_t frameType;
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bool isHeader;
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};
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MPEG2Info parseMPEG2Header(const std::string &hdr);
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MPEG2Info parseMPEG2Header(const char *hdr);
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bool parseMPEG2Header(const char *hdr, MPEG2Info &mpInfo);
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void parseMPEG2Headers(const char *hdr, uint32_t len, MPEG2Info &mpInfo);
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MPEG2Info parseMPEG2Headers(const char *hdr, uint32_t len);
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}// namespace Mpeg
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