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# decoder.h

    00001 /*
    00002  * libmad - MPEG audio decoder library
    00003  * Copyright (C) 2000-2003 Underbit Technologies, Inc.
    00004  *
    00005  * This program is free software; you can redistribute it and/or modify
    00006  * it under the terms of the GNU General Public License as published by
    00007  * the Free Software Foundation; either version 2 of the License, or
    00008  * (at your option) any later version.
    00009  *
    00010  * This program is distributed in the hope that it will be useful,
    00011  * but WITHOUT ANY WARRANTY; without even the implied warranty of
    00012  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    00013  * GNU General Public License for more details.
    00014  *
    00015  * You should have received a copy of the GNU General Public License
    00016  * along with this program; if not, write to the Free Software
    00017  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
    00018  *
    00019  * $Id: decoder.h,v 1.1 2003/08/31 18:59:46 gabest Exp $
    00020  */
    00021
    00022 # ifndef LIBMAD_DECODER_H
    00023 # define LIBMAD_DECODER_H
    00024
    00025 # include "stream.h"
    00026 # include "frame.h"
    00027 # include "synth.h"
    00028
    00029 enum mad_decoder_mode {
    00030   MAD_DECODER_MODE_SYNC  = 0,
    00031   MAD_DECODER_MODE_ASYNC
    00032 };
    00033
    00034 enum mad_flow {
    00035   MAD_FLOW_CONTINUE = 0x0000,   /* continue normally */
    00036   MAD_FLOW_STOP     = 0x0010,   /* stop decoding normally */
    00037   MAD_FLOW_BREAK    = 0x0011,   /* stop decoding and signal an error */
    00038   MAD_FLOW_IGNORE   = 0x0020    /* ignore the current frame */
    00039 };
    00040
    00041 struct mad_decoder {
    00042   enum mad_decoder_mode mode;
    00043
    00044   int options;
    00045
    00046   struct {
    00047     long pid;
    00048     int in;
    00049     int out;
    00050   } async;
    00051
    00052   struct {
    00053     struct mad_stream stream;
    00054     struct mad_frame frame;
    00055     struct mad_synth synth;
    00056   } *sync;
    00057
    00058   void *cb_data;
    00059
    00060   enum mad_flow (*input_func)(void *, struct mad_stream *);
    00061   enum mad_flow (*header_func)(void *, struct mad_header const *);
    00062   enum mad_flow (*filter_func)(void *,
    00063                                struct mad_stream const *, struct mad_frame *);
    00064   enum mad_flow (*output_func)(void *,
    00065                                struct mad_header const *, struct mad_pcm *);
    00066   enum mad_flow (*error_func)(void *, struct mad_stream *, struct mad_frame *);
    00067   enum mad_flow (*message_func)(void *, void *, unsigned int *);
    00068 };
    00069
    00070 void mad_decoder_init(struct mad_decoder *, void *,
    00071                       enum mad_flow (*)(void *, struct mad_stream *),
    00072                       enum mad_flow (*)(void *, struct mad_header const *),
    00073                       enum mad_flow (*)(void *,
    00074                                         struct mad_stream const *,
    00075                                         struct mad_frame *),
    00076                       enum mad_flow (*)(void *,
    00077                                         struct mad_header const *,
    00078                                         struct mad_pcm *),
    00079                       enum mad_flow (*)(void *,
    00080                                         struct mad_stream *,
    00081                                         struct mad_frame *),
    00082                       enum mad_flow (*)(void *, void *, unsigned int *));
    00083 int mad_decoder_finish(struct mad_decoder *);
    00084
    00085 # define mad_decoder_options(decoder, opts)  \
    00086     ((void) ((decoder)->options = (opts)))
    00087
    00088 int mad_decoder_run(struct mad_decoder *, enum mad_decoder_mode);
    00089 int mad_decoder_message(struct mad_decoder *, void *, unsigned int *);
    00090
    00091 # endif