apps/codecs/libmad/decoder.h

   1 /*
   2  * libmad - MPEG audio decoder library
   3  * Copyright (C) 2000-2004 Underbit Technologies, Inc.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  18  *
  19  * $Id$
  20  */
  21
  22 # ifndef LIBMAD_DECODER_H
  23 # define LIBMAD_DECODER_H
  24
  25 # include "stream.h"
  26 # include "frame.h"
  27 # include "synth.h"
  28
  29 enum mad_decoder_mode {
  30   MAD_DECODER_MODE_SYNC  = 0,
  31   MAD_DECODER_MODE_ASYNC
  32 };
  33
  34 enum mad_flow {
  35   MAD_FLOW_CONTINUE = 0x0000,   /* continue normally */
  36   MAD_FLOW_STOP     = 0x0010,   /* stop decoding normally */
  37   MAD_FLOW_BREAK    = 0x0011,   /* stop decoding and signal an error */
  38   MAD_FLOW_IGNORE   = 0x0020    /* ignore the current frame */
  39 };
  40
  41 struct mad_decoder {
  42   enum mad_decoder_mode mode;
  43
  44   int options;
  45
  46   struct {
  47     long pid;
  48     int in;
  49     int out;
  50   } async;
  51
  52   struct {
  53     struct mad_stream stream;
  54     struct mad_frame frame;
  55     struct mad_synth synth;
  56   } *sync;
  57
  58   void *cb_data;
  59
  60   enum mad_flow (*input_func)(void *, struct mad_stream *);
  61   enum mad_flow (*header_func)(void *, struct mad_header const *);
  62   enum mad_flow (*filter_func)(void *,
  63                                struct mad_stream const *, struct mad_frame *);
  64   enum mad_flow (*output_func)(void *,
  65                                struct mad_header const *, struct mad_pcm *);
  66   enum mad_flow (*error_func)(void *, struct mad_stream *, struct mad_frame *);
  67   enum mad_flow (*message_func)(void *, void *, unsigned int *);
  68 };
  69
  70 void mad_decoder_init(struct mad_decoder *, void *,
  71                       enum mad_flow (*)(void *, struct mad_stream *),
  72                       enum mad_flow (*)(void *, struct mad_header const *),
  73                       enum mad_flow (*)(void *,
  74                                         struct mad_stream const *,
  75                                         struct mad_frame *),
  76                       enum mad_flow (*)(void *,
  77                                         struct mad_header const *,
  78                                         struct mad_pcm *),
  79                       enum mad_flow (*)(void *,
  80                                         struct mad_stream *,
  81                                         struct mad_frame *),
  82                       enum mad_flow (*)(void *, void *, unsigned int *));
  83 int mad_decoder_finish(struct mad_decoder *);
  84
  85 # define mad_decoder_options(decoder, opts)  \
  86     ((void) ((decoder)->options = (opts)))
  87
  88 int mad_decoder_run(struct mad_decoder *, enum mad_decoder_mode);
  89 int mad_decoder_message(struct mad_decoder *, void *, unsigned int *);
  90
  91 # endif