mp3dec.h

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/* ***** BEGIN LICENSE BLOCK ***** 
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 * ***** END LICENSE BLOCK ***** */ 
 
/**************************************************************************************
 * Fixed-point MP3 decoder
 * Jon Recker (jrecker@real.com), Ken Cooke (kenc@real.com)
 * June 2003
 *
 * mp3dec.h - public C API for MP3 decoder
 **************************************************************************************/
 
#ifndef _MP3DEC_H
#define _MP3DEC_H
 
#if defined(_WIN32) && !defined(_WIN32_WCE)
#
#elif defined(_WIN32) && defined(_WIN32_WCE) && defined(ARM)
#
#elif defined(_WIN32) && defined(WINCE_EMULATOR)
#
#elif defined(ARM_ADS)
#
#elif defined(_SYMBIAN) && defined(__WINS__)  /* Symbian emulator for Ix86 */
#
#elif defined(__GNUC__) && defined(ARM)
#
#elif defined(__GNUC__) && defined(__i386__)
#
#elif defined(_OPENWAVE_SIMULATOR) || defined(_OPENWAVE_ARMULATOR)
#
#else
//#error No platform defined. See valid options in mp3dec.h
#endif
 
#ifdef __cplusplus
extern "C" {
#endif
 
/* determining MAINBUF_SIZE:
 *   max mainDataBegin = (2^9 - 1) bytes (since 9-bit offset) = 511
 *   max nSlots (concatenated with mainDataBegin bytes from before) = 1440 - 9 - 4 + 1 = 1428
 *   511 + 1428 = 1939, round up to 1940 (4-byte align)
 */
#define MAINBUF_SIZE  1940
 
#define MAX_NGRAN   2   /* max granules */
#define MAX_NCHAN   2   /* max channels */
#define MAX_NSAMP   576   /* max samples per channel, per granule */
 
/* map to 0,1,2 to make table indexing easier */
typedef enum {
  MPEG1 =  0,
  MPEG2 =  1,
  MPEG25 = 2
} MPEGVersion;
 
typedef void *HMP3Decoder;
 
enum {
  ERR_MP3_NONE =                  0,
  ERR_MP3_INDATA_UNDERFLOW =     -1,
  ERR_MP3_MAINDATA_UNDERFLOW =   -2,
  ERR_MP3_FREE_BITRATE_SYNC =    -3,
  ERR_MP3_OUT_OF_MEMORY =        -4,
  ERR_MP3_NULL_POINTER =         -5,
  ERR_MP3_INVALID_FRAMEHEADER =  -6,
  ERR_MP3_INVALID_SIDEINFO =     -7,
  ERR_MP3_INVALID_SCALEFACT =    -8,
  ERR_MP3_INVALID_HUFFCODES =    -9,
  ERR_MP3_INVALID_DEQUANTIZE =   -10,
  ERR_MP3_INVALID_IMDCT =        -11,
  ERR_MP3_INVALID_SUBBAND =      -12,
 
  ERR_UNKNOWN =                  -9999
};
 
typedef struct _MP3FrameInfo {
  int bitrate;
  int nChans;
  int samprate;
  int bitsPerSample;
  int outputSamps;
  int layer;
  int version;
} MP3FrameInfo;
 
/* public API */
HMP3Decoder MP3InitDecoder(void);
void MP3FreeDecoder(HMP3Decoder hMP3Decoder);
int MP3Decode(HMP3Decoder hMP3Decoder, unsigned char **inbuf, int *bytesLeft, short *outbuf, int useSize);
 
void MP3GetLastFrameInfo(HMP3Decoder hMP3Decoder, MP3FrameInfo *mp3FrameInfo);
int MP3GetNextFrameInfo(HMP3Decoder hMP3Decoder, MP3FrameInfo *mp3FrameInfo, unsigned char *buf);
int MP3FindSyncWord(unsigned char *buf, int nBytes);
 
#ifdef __cplusplus
}
#endif
 
#endif  /* _MP3DEC_H */