mhead.h

著名的 helix realplayer 基于手机 symbian 系统的 播放器全套源代码

/* ***** BEGIN LICENSE BLOCK ***** 
 * Version: RCSL 1.0/RPSL 1.0 
 *  
 * Portions Copyright (c) 1995-2002 RealNetworks, Inc. All Rights Reserved. 
 *      
 * The contents of this file, and the files included with this file, are 
 * subject to the current version of the RealNetworks Public Source License 
 * Version 1.0 (the "RPSL") available at 
 * http://www.helixcommunity.org/content/rpsl unless you have licensed 
 * the file under the RealNetworks Community Source License Version 1.0 
 * (the "RCSL") available at http://www.helixcommunity.org/content/rcsl, 
 * in which case the RCSL will apply. You may also obtain the license terms 
 * directly from RealNetworks.  You may not use this file except in 
 * compliance with the RPSL or, if you have a valid RCSL with RealNetworks 
 * applicable to this file, the RCSL.  Please see the applicable RPSL or 
 * RCSL for the rights, obligations and limitations governing use of the 
 * contents of the file.  
 *  
 * This file is part of the Helix DNA Technology. RealNetworks is the 
 * developer of the Original Code and owns the copyrights in the portions 
 * it created. 
 *  
 * This file, and the files included with this file, is distributed and made 
 * available on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 
 * EXPRESS OR IMPLIED, AND REALNETWORKS HEREBY DISCLAIMS ALL SUCH WARRANTIES, 
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, FITNESS 
 * FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 
 * 
 * Technology Compatibility Kit Test Suite(s) Location: 
 *    http://www.helixcommunity.org/content/tck 
 * 
 * Contributor(s): 
 *  
 * ***** END LICENSE BLOCK ***** */ 

#ifndef _MHEAD_H_
#define _MHEAD_H_

#include "decodercommon.h"

/* portable copy of eco\mhead.h */
/* mpeg audio header   */
typedef struct {
int sync;                     /* 1 if valid sync */
int id;
int option;
int prot;
int br_index;
int sr_index;
int pad;
int private_bit;
int mode;
int mode_ext;
int cr;
int original;
int emphasis;
} MPEG_HEAD;

/* portable mpeg audio decoder, decoder functions */
/*typedef struct {
int in_bytes;
int out_bytes;
} IN_OUT;


typedef struct {
int channels;
int outvalues;
long samprate;
int bits;
int framebytes;
int type;
} DEC_INFO;*/


#ifdef __cplusplus
   extern "C"  {
#endif

int head_info(unsigned char *buf, unsigned int n, MPEG_HEAD *h, int trustFrame);
int head_info2(unsigned char *buf, 
               unsigned int n, MPEG_HEAD *h, int *br, int trustFrame);

/* head_info returns framebytes > 0 for success */
/* audio_decode_init returns 1 for success, 0 for fail */
/* audio_decode returns in_bytes = 0 on sync loss */

int audio_decode_init(MPEG_HEAD *h, int framebytes_arg,
         int reduction_code, int transform_code, int convert_code,
         int freq_limit);
void audio_decode_info( DEC_INFO *info);
IN_OUT audio_decode(unsigned char *bs, short *pcm, int size);
IN_OUT L3audio_decode_MPEG1Special(unsigned char *bs, 
                                   unsigned char *pcm, int size);



int audio_decode8_init(MPEG_HEAD *h, int framebytes_arg,
         int reduction_code, int transform_code, int convert_code,
         int freq_limit);
void audio_decode8_info( DEC_INFO *info);
IN_OUT audio_decode8(unsigned char *bs, short *pcmbuf);

/*-- integer decode --*/
int i_audio_decode_init(MPEG_HEAD *h, int framebytes_arg,
         int reduction_code, int transform_code, int convert_code,
         int freq_limit);
void i_audio_decode_info( DEC_INFO *info);
IN_OUT i_audio_decode(unsigned char *bs, short *pcm);



#ifdef __cplusplus
    }
#endif

#endif