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1 /*
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2 * libmad - MPEG audio decoder library
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3 * Copyright (C) 2000-2004 Underbit Technologies, Inc.
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4 *
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5 * This program is free software; you can redistribute it and/or modify
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6 * it under the terms of the GNU General Public License as published by
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7 * the Free Software Foundation; either version 2 of the License, or
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8 * (at your option) any later version.
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9 *
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10 * This program is distributed in the hope that it will be useful,
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11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 * GNU General Public License for more details.
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14 *
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15 * You should have received a copy of the GNU General Public License
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16 * along with this program; if not, write to the Free Software
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17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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18 *
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19 * $Id: stream.h,v 1.20 2004/02/05 09:02:39 rob Exp $
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20 */
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21
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22 # ifndef LIBMAD_STREAM_H
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23 # define LIBMAD_STREAM_H
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24
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25 # include "bit.h"
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26
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27 # define MAD_BUFFER_GUARD 8
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28 # define MAD_BUFFER_MDLEN (511 + 2048 + MAD_BUFFER_GUARD)
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29
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30 enum mad_error {
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31 MAD_ERROR_NONE = 0x0000, /* no error */
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32
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33 MAD_ERROR_BUFLEN = 0x0001, /* input buffer too small (or EOF) */
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34 MAD_ERROR_BUFPTR = 0x0002, /* invalid (null) buffer pointer */
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35
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36 MAD_ERROR_NOMEM = 0x0031, /* not enough memory */
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37
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38 MAD_ERROR_LOSTSYNC = 0x0101, /* lost synchronization */
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39 MAD_ERROR_BADLAYER = 0x0102, /* reserved header layer value */
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40 MAD_ERROR_BADBITRATE = 0x0103, /* forbidden bitrate value */
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41 MAD_ERROR_BADSAMPLERATE = 0x0104, /* reserved sample frequency value */
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42 MAD_ERROR_BADEMPHASIS = 0x0105, /* reserved emphasis value */
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43
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44 MAD_ERROR_BADCRC = 0x0201, /* CRC check failed */
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45 MAD_ERROR_BADBITALLOC = 0x0211, /* forbidden bit allocation value */
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46 MAD_ERROR_BADSCALEFACTOR = 0x0221, /* bad scalefactor index */
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47 MAD_ERROR_BADMODE = 0x0222, /* bad bitrate/mode combination */
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48 MAD_ERROR_BADFRAMELEN = 0x0231, /* bad frame length */
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49 MAD_ERROR_BADBIGVALUES = 0x0232, /* bad big_values count */
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50 MAD_ERROR_BADBLOCKTYPE = 0x0233, /* reserved block_type */
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51 MAD_ERROR_BADSCFSI = 0x0234, /* bad scalefactor selection info */
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52 MAD_ERROR_BADDATAPTR = 0x0235, /* bad main_data_begin pointer */
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53 MAD_ERROR_BADPART3LEN = 0x0236, /* bad audio data length */
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54 MAD_ERROR_BADHUFFTABLE = 0x0237, /* bad Huffman table select */
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55 MAD_ERROR_BADHUFFDATA = 0x0238, /* Huffman data overrun */
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56 MAD_ERROR_BADSTEREO = 0x0239 /* incompatible block_type for JS */
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57 };
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58
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59 # define MAD_RECOVERABLE(error) ((error) & 0xff00)
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60
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61 struct mad_stream {
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62 unsigned char const *buffer; /* input bitstream buffer */
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63 unsigned char const *bufend; /* end of buffer */
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64 unsigned long skiplen; /* bytes to skip before next frame */
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65
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66 int sync; /* stream sync found */
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67 unsigned long freerate; /* free bitrate (fixed) */
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68
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69 unsigned char const *this_frame; /* start of current frame */
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70 unsigned char const *next_frame; /* start of next frame */
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71 struct mad_bitptr ptr; /* current processing bit pointer */
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72
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73 struct mad_bitptr anc_ptr; /* ancillary bits pointer */
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74 unsigned int anc_bitlen; /* number of ancillary bits */
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75
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76 unsigned char (*main_data)[MAD_BUFFER_MDLEN];
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77 /* Layer III main_data() */
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78 unsigned int md_len; /* bytes in main_data */
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79
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80 int options; /* decoding options (see below) */
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81 enum mad_error error; /* error code (see above) */
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82 };
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83
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84 enum {
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85 MAD_OPTION_IGNORECRC = 0x0001, /* ignore CRC errors */
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86 MAD_OPTION_HALFSAMPLERATE = 0x0002 /* generate PCM at 1/2 sample rate */
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87 # if 0 /* not yet implemented */
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88 MAD_OPTION_LEFTCHANNEL = 0x0010, /* decode left channel only */
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89 MAD_OPTION_RIGHTCHANNEL = 0x0020, /* decode right channel only */
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90 MAD_OPTION_SINGLECHANNEL = 0x0030 /* combine channels */
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91 # endif
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92 };
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93
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94 void mad_stream_init(struct mad_stream *);
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95 void mad_stream_finish(struct mad_stream *);
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96
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97 # define mad_stream_options(stream, opts) \
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98 ((void) ((stream)->options = (opts)))
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99
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100 void mad_stream_buffer(struct mad_stream *,
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101 unsigned char const *, unsigned long);
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102 void mad_stream_skip(struct mad_stream *, unsigned long);
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103
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104 int mad_stream_sync(struct mad_stream *);
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105
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106 char const *mad_stream_errorstr(struct mad_stream const *);
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107
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108 # endif
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