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annotate src/libmad-0.15.1b/stream.h @ 83:ae30d91d2ffe

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Replace these with versions built using an older toolset (so as to avoid ABI compatibilities when linking on Ubuntu 14.04 for packaging purposes)
author Chris Cannam
date Fri, 07 Feb 2020 11:51:13 +0000
parents c7265573341e
children
rev   line source
Chris@0 1 /*
Chris@0 2 * libmad - MPEG audio decoder library
Chris@0 3 * Copyright (C) 2000-2004 Underbit Technologies, Inc.
Chris@0 4 *
Chris@0 5 * This program is free software; you can redistribute it and/or modify
Chris@0 6 * it under the terms of the GNU General Public License as published by
Chris@0 7 * the Free Software Foundation; either version 2 of the License, or
Chris@0 8 * (at your option) any later version.
Chris@0 9 *
Chris@0 10 * This program is distributed in the hope that it will be useful,
Chris@0 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
Chris@0 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
Chris@0 13 * GNU General Public License for more details.
Chris@0 14 *
Chris@0 15 * You should have received a copy of the GNU General Public License
Chris@0 16 * along with this program; if not, write to the Free Software
Chris@0 17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
Chris@0 18 *
Chris@0 19 * $Id: stream.h,v 1.20 2004/02/05 09:02:39 rob Exp $
Chris@0 20 */
Chris@0 21
Chris@0 22 # ifndef LIBMAD_STREAM_H
Chris@0 23 # define LIBMAD_STREAM_H
Chris@0 24
Chris@0 25 # include "bit.h"
Chris@0 26
Chris@0 27 # define MAD_BUFFER_GUARD 8
Chris@0 28 # define MAD_BUFFER_MDLEN (511 + 2048 + MAD_BUFFER_GUARD)
Chris@0 29
Chris@0 30 enum mad_error {
Chris@0 31 MAD_ERROR_NONE = 0x0000, /* no error */
Chris@0 32
Chris@0 33 MAD_ERROR_BUFLEN = 0x0001, /* input buffer too small (or EOF) */
Chris@0 34 MAD_ERROR_BUFPTR = 0x0002, /* invalid (null) buffer pointer */
Chris@0 35
Chris@0 36 MAD_ERROR_NOMEM = 0x0031, /* not enough memory */
Chris@0 37
Chris@0 38 MAD_ERROR_LOSTSYNC = 0x0101, /* lost synchronization */
Chris@0 39 MAD_ERROR_BADLAYER = 0x0102, /* reserved header layer value */
Chris@0 40 MAD_ERROR_BADBITRATE = 0x0103, /* forbidden bitrate value */
Chris@0 41 MAD_ERROR_BADSAMPLERATE = 0x0104, /* reserved sample frequency value */
Chris@0 42 MAD_ERROR_BADEMPHASIS = 0x0105, /* reserved emphasis value */
Chris@0 43
Chris@0 44 MAD_ERROR_BADCRC = 0x0201, /* CRC check failed */
Chris@0 45 MAD_ERROR_BADBITALLOC = 0x0211, /* forbidden bit allocation value */
Chris@0 46 MAD_ERROR_BADSCALEFACTOR = 0x0221, /* bad scalefactor index */
Chris@0 47 MAD_ERROR_BADMODE = 0x0222, /* bad bitrate/mode combination */
Chris@0 48 MAD_ERROR_BADFRAMELEN = 0x0231, /* bad frame length */
Chris@0 49 MAD_ERROR_BADBIGVALUES = 0x0232, /* bad big_values count */
Chris@0 50 MAD_ERROR_BADBLOCKTYPE = 0x0233, /* reserved block_type */
Chris@0 51 MAD_ERROR_BADSCFSI = 0x0234, /* bad scalefactor selection info */
Chris@0 52 MAD_ERROR_BADDATAPTR = 0x0235, /* bad main_data_begin pointer */
Chris@0 53 MAD_ERROR_BADPART3LEN = 0x0236, /* bad audio data length */
Chris@0 54 MAD_ERROR_BADHUFFTABLE = 0x0237, /* bad Huffman table select */
Chris@0 55 MAD_ERROR_BADHUFFDATA = 0x0238, /* Huffman data overrun */
Chris@0 56 MAD_ERROR_BADSTEREO = 0x0239 /* incompatible block_type for JS */
Chris@0 57 };
Chris@0 58
Chris@0 59 # define MAD_RECOVERABLE(error) ((error) & 0xff00)
Chris@0 60
Chris@0 61 struct mad_stream {
Chris@0 62 unsigned char const *buffer; /* input bitstream buffer */
Chris@0 63 unsigned char const *bufend; /* end of buffer */
Chris@0 64 unsigned long skiplen; /* bytes to skip before next frame */
Chris@0 65
Chris@0 66 int sync; /* stream sync found */
Chris@0 67 unsigned long freerate; /* free bitrate (fixed) */
Chris@0 68
Chris@0 69 unsigned char const *this_frame; /* start of current frame */
Chris@0 70 unsigned char const *next_frame; /* start of next frame */
Chris@0 71 struct mad_bitptr ptr; /* current processing bit pointer */
Chris@0 72
Chris@0 73 struct mad_bitptr anc_ptr; /* ancillary bits pointer */
Chris@0 74 unsigned int anc_bitlen; /* number of ancillary bits */
Chris@0 75
Chris@0 76 unsigned char (*main_data)[MAD_BUFFER_MDLEN];
Chris@0 77 /* Layer III main_data() */
Chris@0 78 unsigned int md_len; /* bytes in main_data */
Chris@0 79
Chris@0 80 int options; /* decoding options (see below) */
Chris@0 81 enum mad_error error; /* error code (see above) */
Chris@0 82 };
Chris@0 83
Chris@0 84 enum {
Chris@0 85 MAD_OPTION_IGNORECRC = 0x0001, /* ignore CRC errors */
Chris@0 86 MAD_OPTION_HALFSAMPLERATE = 0x0002 /* generate PCM at 1/2 sample rate */
Chris@0 87 # if 0 /* not yet implemented */
Chris@0 88 MAD_OPTION_LEFTCHANNEL = 0x0010, /* decode left channel only */
Chris@0 89 MAD_OPTION_RIGHTCHANNEL = 0x0020, /* decode right channel only */
Chris@0 90 MAD_OPTION_SINGLECHANNEL = 0x0030 /* combine channels */
Chris@0 91 # endif
Chris@0 92 };
Chris@0 93
Chris@0 94 void mad_stream_init(struct mad_stream *);
Chris@0 95 void mad_stream_finish(struct mad_stream *);
Chris@0 96
Chris@0 97 # define mad_stream_options(stream, opts) \
Chris@0 98 ((void) ((stream)->options = (opts)))
Chris@0 99
Chris@0 100 void mad_stream_buffer(struct mad_stream *,
Chris@0 101 unsigned char const *, unsigned long);
Chris@0 102 void mad_stream_skip(struct mad_stream *, unsigned long);
Chris@0 103
Chris@0 104 int mad_stream_sync(struct mad_stream *);
Chris@0 105
Chris@0 106 char const *mad_stream_errorstr(struct mad_stream const *);
Chris@0 107
Chris@0 108 # endif