Initial community commit

Src/libvp6/include/Mp3Header.hpp

@@ -0,0 +1,63 @@
+#if !defined(MP3HEADER_HPP)
+#define MP3HEADER_HPP
+
+#include <iosfwd>
+
+class Mp3Header
+{
+public:
+    Mp3Header(unsigned long);
+    unsigned long  id;
+    unsigned long  layer;
+    unsigned long  protectionBit;
+    unsigned long  bitRateIndex;
+    unsigned long  samplingFrequency;
+    unsigned long  paddingBit;
+    unsigned long  privateBit;
+    unsigned long  mode;
+    unsigned long  modeExtension;
+    unsigned long  copyright;
+    unsigned long  originalOrCopy;
+    unsigned long  emphasis;
+    unsigned long  nch;
+    unsigned long  sampleRate;
+    unsigned long  bitRate;
+    unsigned long  frameSize;
+    unsigned short outFrameSize;
+
+    enum { BITRATE_FREE = 0 };
+    enum { MPEG_FORBIDDEN = -1};
+    enum { SAMPLING_FREQUENCY_RESERVED = -1};
+
+    enum IdTypes
+    {
+        MPEG1 = 1,
+        MPEG2 = 2
+    };
+
+    enum AudioMode
+    {
+        STEREO_MODE = 0,
+        JOINT_STEREO_MODE = 1,
+        DUAL_CHANNEL_MODE = 2,
+        SINGLE_CHANNEL_MODE = 3
+    };
+
+    /* layer code, very bad design */
+    enum AudioLayer
+    {
+        AUDIO_LAYER_1 = 3,
+        AUDIO_LAYER_2 = 2,
+        AUDIO_LAYER_3 = 1,
+        AUDIO_LAYER_RESERVED = 0
+    };
+    friend std::ostream& operator<<(std::ostream& os, const Mp3Header& mp3);
+
+private:
+    static const unsigned short samplingFrequencyTable[2][4];
+    static const short m1BitRateTable[3][16];
+    static const short m2BitRateTable[3][16];
+    static const unsigned short outFrameSizes[2][4];
+
+};
+#endif