libmad/decoder.h

/*
 * 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: decoder.h,v 1.17 2004/01/23 09:41:32 rob Exp $
 */

# ifndef LIBMAD_DECODER_H
# define LIBMAD_DECODER_H

# include "stream.h"
# include "frame.h"
# include "synth.h"

enum mad_decoder_mode {
    MAD_DECODER_MODE_SYNC  = 0,
    MAD_DECODER_MODE_ASYNC
};

enum mad_flow {
    MAD_FLOW_CONTINUE = 0x0000,   /* continue normally */
    MAD_FLOW_STOP     = 0x0010,   /* stop decoding normally */
    MAD_FLOW_BREAK    = 0x0011,   /* stop decoding and signal an error */
    MAD_FLOW_IGNORE   = 0x0020    /* ignore the current frame */
};

struct  mad_decoder{
    enum mad_decoder_mode mode;
    int bad_last_frame;
    unsigned int decoded_nb_frames;
    unsigned int droppped_nb_frames;
    unsigned int error_nb_frames;
    int bit_rate;
    int last_sr;
    int last_ch_num;
    int options;
    char *pcm_out_data;
    int *pcm_out_len;
    struct {
        long pid;
        int in;
        int out;
    } async;

    struct {
        struct mad_stream stream;
        struct mad_frame frame;
        struct mad_synth synth;
    } *sync;

    void *cb_data;

    enum mad_flow(*input_func)(void *, struct mad_stream *);
    enum mad_flow(*header_func)(void *, struct mad_header const *);
    enum mad_flow(*filter_func)(void *,
                                struct mad_stream const *, struct mad_frame *);
    enum mad_flow(*output_func)(struct mad_decoder *,
                                struct mad_header const *, struct mad_pcm *);
    enum mad_flow(*error_func)(void *, struct mad_stream *, struct mad_frame *);
    enum mad_flow(*message_func)(void *, void *, unsigned int *);
};

void mad_decoder_init(struct mad_decoder *, void *,
                      enum mad_flow(*)(void *, struct mad_stream *),
                      enum mad_flow(*)(void *, struct mad_header const *),
                      enum mad_flow(*)(void *,
                                       struct mad_stream const *,
                                       struct mad_frame *),
                      enum mad_flow(*)(struct mad_decoder *,
                                       struct mad_header const *,
                                       struct mad_pcm *),
                      enum mad_flow(*)(void *,
                                       struct mad_stream *,
                                       struct mad_frame *),
                      enum mad_flow(*)(void *, void *, unsigned int *));
int mad_decoder_finish(struct mad_decoder *);

# define mad_decoder_options(decoder, opts)  \
    ((void) ((decoder)->options = (opts)))

int mad_decoder_run(struct mad_decoder *, enum mad_decoder_mode);
int mad_decoder_message(struct mad_decoder *, void *, unsigned int *);

# endif