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: synth.h,v 1.15 2004/01/23 09:41:33 rob Exp $ 20 */ 21 22 # ifndef LIBMAD_SYNTH_H 23 # define LIBMAD_SYNTH_H 24 25 # include "fixed.h" 26 # include "frame.h" 27 28 struct mad_pcm { 29 unsigned int samplerate; /* sampling frequency (Hz) */ 30 unsigned short channels; /* number of channels */ 31 unsigned short length; /* number of samples per channel */ 32 mad_fixed_t samples[2][1152]; /* PCM output samples [ch][sample] */ 33 }; 34 35 struct mad_synth { 36 mad_fixed_t filter[2][2][2][16][8]; /* polyphase filterbank outputs */ 37 /* [ch][eo][peo][s][v] */ 38 39 unsigned int phase; /* current processing phase */ 40 41 struct mad_pcm pcm; /* PCM output */ 42 }; 43 44 /* single channel PCM selector */ 45 enum { 46 MAD_PCM_CHANNEL_SINGLE = 0 47 }; 48 49 /* dual channel PCM selector */ 50 enum { 51 MAD_PCM_CHANNEL_DUAL_1 = 0, 52 MAD_PCM_CHANNEL_DUAL_2 = 1 53 }; 54 55 /* stereo PCM selector */ 56 enum { 57 MAD_PCM_CHANNEL_STEREO_LEFT = 0, 58 MAD_PCM_CHANNEL_STEREO_RIGHT = 1 59 }; 60 61 void mad_synth_init(struct mad_synth *); 62 63 # define mad_synth_finish(synth) /* nothing */ 64 65 void mad_synth_mute(struct mad_synth *); 66 67 void mad_synth_frame(struct mad_synth *, struct mad_frame const *); 68 69 # endif 70