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/*
* 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
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