106 lines
2.7 KiB
C
106 lines
2.7 KiB
C
/*
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* http://www.helixcommunity.org
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*/
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/**************************************************************************************
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* Fixed-point MP3 decoder
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*
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* mp3dec.h - public C API for MP3 decoder
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**************************************************************************************/
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#ifndef __LISTENAI_MP3DEC_H__
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#define __LISTENAI_MP3DEC_H__
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#if defined(_WIN32) && !defined(_WIN32_WCE)
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#
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#elif defined(_WIN32) && defined(_WIN32_WCE) && defined(ARM)
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#
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#elif defined(_WIN32) && defined(WINCE_EMULATOR)
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#
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#elif defined(ARM_ADS)
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#
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#elif defined(_SYMBIAN) && defined(__WINS__) /* Symbian emulator for Ix86 */
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#
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#elif defined(__GNUC__) && defined(ARM)
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#
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#elif defined(__GNUC__) && defined(__arm__)
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#
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#elif defined(__GNUC__) && defined(__i386__)
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#
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#elif defined(_OPENWAVE_SIMULATOR) || defined(_OPENWAVE_ARMULATOR)
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#
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#elif defined(__linux__)
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#
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#elif defined(__riscv) || defined(__riscv__)
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#
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#else
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#error No platform defined. See valid options in mp3dec.h
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#endif
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* determining MAINBUF_SIZE:
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* max mainDataBegin = (2^9 - 1) bytes (since 9-bit offset) = 511
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* max nSlots (concatenated with mainDataBegin bytes from before) = 1440 - 9 - 4 + 1 = 1428
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* 511 + 1428 = 1939, round up to 1940 (4-byte align)
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*/
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#define MAINBUF_SIZE 1940
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#define MAX_NGRAN 2 /* max granules */
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#define MAX_NCHAN 2 /* max channels */
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#define MAX_NSAMP 576 /* max samples per channel, per granule */
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/* map to 0,1,2 to make table indexing easier */
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typedef enum {
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MPEG1 = 0,
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MPEG2 = 1,
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MPEG25 = 2
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} MPEGVersion;
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typedef void *HMP3Decoder;
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enum {
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ERR_MP3_NONE = 0,
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ERR_MP3_INDATA_UNDERFLOW = -1,
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ERR_MP3_MAINDATA_UNDERFLOW = -2,
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ERR_MP3_FREE_BITRATE_SYNC = -3,
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ERR_MP3_OUT_OF_MEMORY = -4,
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ERR_MP3_NULL_POINTER = -5,
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ERR_MP3_INVALID_FRAMEHEADER = -6,
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ERR_MP3_INVALID_SIDEINFO = -7,
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ERR_MP3_INVALID_SCALEFACT = -8,
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ERR_MP3_INVALID_HUFFCODES = -9,
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ERR_MP3_INVALID_DEQUANTIZE = -10,
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ERR_MP3_INVALID_IMDCT = -11,
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ERR_MP3_INVALID_SUBBAND = -12,
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ERR_UNKNOWN = -9999
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};
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typedef struct _MP3FrameInfo {
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int bitrate;
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int nChans;
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int samprate;
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int bitsPerSample;
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int outputSamps;
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int layer;
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int version;
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} MP3FrameInfo;
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/* public API */
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HMP3Decoder MP3InitDecoder(void);
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void MP3FreeDecoder(HMP3Decoder hMP3Decoder);
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int MP3Decode(HMP3Decoder hMP3Decoder, unsigned char **inbuf, int *bytesLeft, short *outbuf, int useSize);
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void MP3GetLastFrameInfo(HMP3Decoder hMP3Decoder, MP3FrameInfo *mp3FrameInfo);
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int MP3GetNextFrameInfo(HMP3Decoder hMP3Decoder, MP3FrameInfo *mp3FrameInfo, unsigned char *buf);
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int MP3FindSyncWord(unsigned char *buf, int nBytes);
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#ifdef __cplusplus
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}
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#endif
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#endif
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