/* * libmad - MPEG audio decoder library * Copyright (C) 2000-2004 Underbit Technologies, Inc. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA * * $Id: stream.h,v 1.20 2004/02/05 09:02:39 rob Exp $ */# ifndef LIBMAD_STREAM_H# define LIBMAD_STREAM_H# include "bit.h"# define MAD_BUFFER_GUARD	8# define MAD_BUFFER_MDLEN	(511 + 2048 + MAD_BUFFER_GUARD)enum mad_error {  MAD_ERROR_NONE	   = 0x0000,	/* no error */  MAD_ERROR_BUFLEN	   = 0x0001,	/* input buffer too small (or EOF) */  MAD_ERROR_BUFPTR	   = 0x0002,	/* invalid (null) buffer pointer */  MAD_ERROR_NOMEM	   = 0x0031,	/* not enough memory */  MAD_ERROR_LOSTSYNC	   = 0x0101,	/* lost synchronization */  MAD_ERROR_BADLAYER	   = 0x0102,	/* reserved header layer value */  MAD_ERROR_BADBITRATE	   = 0x0103,	/* forbidden bitrate value */  MAD_ERROR_BADSAMPLERATE  = 0x0104,	/* reserved sample frequency value */  MAD_ERROR_BADEMPHASIS	   = 0x0105,	/* reserved emphasis value */  MAD_ERROR_BADCRC	   = 0x0201,	/* CRC check failed */  MAD_ERROR_BADBITALLOC	   = 0x0211,	/* forbidden bit allocation value */  MAD_ERROR_BADSCALEFACTOR = 0x0221,	/* bad scalefactor index */  MAD_ERROR_BADMODE        = 0x0222,	/* bad bitrate/mode combination */  MAD_ERROR_BADFRAMELEN	   = 0x0231,	/* bad frame length */  MAD_ERROR_BADBIGVALUES   = 0x0232,	/* bad big_values count */  MAD_ERROR_BADBLOCKTYPE   = 0x0233,	/* reserved block_type */  MAD_ERROR_BADSCFSI	   = 0x0234,	/* bad scalefactor selection info */  MAD_ERROR_BADDATAPTR	   = 0x0235,	/* bad main_data_begin pointer */  MAD_ERROR_BADPART3LEN	   = 0x0236,	/* bad audio data length */  MAD_ERROR_BADHUFFTABLE   = 0x0237,	/* bad Huffman table select */  MAD_ERROR_BADHUFFDATA	   = 0x0238,	/* Huffman data overrun */  MAD_ERROR_BADSTEREO	   = 0x0239	/* incompatible block_type for JS */};# define MAD_RECOVERABLE(error)	((error) & 0xff00)struct mad_stream {  unsigned char const *buffer;		/* input bitstream buffer */  unsigned char const *bufend;		/* end of buffer */  unsigned long skiplen;		/* bytes to skip before next frame */  int sync;				/* stream sync found */  unsigned long freerate;		/* free bitrate (fixed) */  unsigned char const *this_frame;	/* start of current frame */  unsigned char const *next_frame;	/* start of next frame */  struct mad_bitptr ptr;		/* current processing bit pointer */  struct mad_bitptr anc_ptr;		/* ancillary bits pointer */  unsigned int anc_bitlen;		/* number of ancillary bits */  unsigned char (*main_data)[MAD_BUFFER_MDLEN];					/* Layer III main_data() */  unsigned int md_len;			/* bytes in main_data */  int options;				/* decoding options (see below) */  enum mad_error error;			/* error code (see above) */};enum {  MAD_OPTION_IGNORECRC      = 0x0001,	/* ignore CRC errors */  MAD_OPTION_HALFSAMPLERATE = 0x0002	/* generate PCM at 1/2 sample rate */# if 0  /* not yet implemented */  MAD_OPTION_LEFTCHANNEL    = 0x0010,	/* decode left channel only */  MAD_OPTION_RIGHTCHANNEL   = 0x0020,	/* decode right channel only */  MAD_OPTION_SINGLECHANNEL  = 0x0030	/* combine channels */# endif};void mad_stream_init(struct mad_stream *);void mad_stream_finish(struct mad_stream *);# define mad_stream_options(stream, opts)  \    ((void) ((stream)->options = (opts)))void mad_stream_buffer(struct mad_stream *,		       unsigned char const *, unsigned long);void mad_stream_skip(struct mad_stream *, unsigned long);int mad_stream_sync(struct mad_stream *);char const *mad_stream_errorstr(struct mad_stream const *);# endif