mhead.h

DSP c64优化 ACT spraa14 mp3优化实例 与其优化应用报告配套

/*____________________________________________________________________________
	
	FreeAmp - The Free MP3 Player

        MP3 Decoder originally Copyright (C) 1995-1997 Xing Technology
        Corp.  http://www.xingtech.com

	Portions Copyright (C) 1998 EMusic.com

	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., 675 Mass Ave, Cambridge, MA 02139, USA.
	
____________________________________________________________________________*/

/* 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;


int head_info(unsigned char *buf, unsigned int n, MPEG_HEAD * h);
int head_info2(unsigned char *buf,
               unsigned int n, MPEG_HEAD * h, INT32 *br);
int head_info3(unsigned char *buf, unsigned int n, MPEG_HEAD *h,
               INT32 *br, unsigned int *searchForward);
/* 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 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);

/* ***********************************************************
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* INCLUDING ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS 
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* TI DISCLAIMS ANY WARRANTY OF TITLE, QUIET ENJOYMENT, QUIET 
* POSSESSION, AND NON-INFRINGEMENT OF ANY THIRD PARTY 
* INTELLECTUAL PROPERTY RIGHTS WITH REGARD TO THE PROGRAM OR 
* YOUR USE OF THE PROGRAM.
*
* IN NO EVENT SHALL TI BE LIABLE FOR ANY SPECIAL, INCIDENTAL, 
* CONSEQUENTIAL OR INDIRECT DAMAGES, HOWEVER CAUSED, ON ANY 
* THEORY OF LIABILITY AND WHETHER OR NOT TI HAS BEEN ADVISED 
* OF THE POSSIBILITY OF SUCH DAMAGES, ARISING IN ANY WAY OUT 
* OF THIS AGREEMENT, THE PROGRAM, OR YOUR USE OF THE PROGRAM. 
* EXCLUDED DAMAGES INCLUDE, BUT ARE NOT LIMITED TO, COST OF 
* REMOVAL OR REINSTALLATION, COMPUTER TIME, LABOR COSTS, LOSS 
* OF GOODWILL, LOSS OF PROFITS, LOSS OF SAVINGS, OR LOSS OF 
* USE OR INTERRUPTION OF BUSINESS. IN NO EVENT WILL TI'S 
* AGGREGATE LIABILITY UNDER THIS AGREEMENT OR ARISING OUT OF 
* YOUR USE OF THE PROGRAM EXCEED FIVE HUNDRED DOLLARS 
* (U.S.$500).
*
* Unless otherwise stated, the Program written and copyrighted 
* by Texas Instruments is distributed as "freeware".  You may, 
* only under TI's copyright in the Program, use and modify the 
* Program without any charge or restriction.  You may 
* distribute to third parties, provided that you transfer a 
* copy of this license to the third party and the third party 
* agrees to these terms by its first use of the Program. You 
* must reproduce the copyright notice and any other legend of 
* ownership on each copy or partial copy, of the Program.
*
* You acknowledge and agree that the Program contains 
* copyrighted material, trade secrets and other TI proprietary 
* information and is protected by copyright laws, 
* international copyright treaties, and trade secret laws, as 
* well as other intellectual property laws.  To protect TI's 
* rights in the Program, you agree not to decompile, reverse 
* engineer, disassemble or otherwise translate any object code 
* versions of the Program to a human-readable form.  You agree 
* that in no event will you alter, remove or destroy any 
* copyright notice included in the Program.  TI reserves all 
* rights not specifically granted under this license. Except 
* as specifically provided herein, nothing in this agreement 
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*
* You may not use the Program in non-TI devices.
* ********************************************************* */