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Diffstat (limited to 'libmad/src/stream.h')
| -rw-r--r-- | libmad/src/stream.h | 108 |
1 files changed, 108 insertions, 0 deletions
diff --git a/libmad/src/stream.h b/libmad/src/stream.h new file mode 100644 index 0000000..8bff8b4 --- /dev/null +++ b/libmad/src/stream.h @@ -0,0 +1,108 @@ +/* + * 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 |