mpadecl3.h
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上传日期:2007-06-06
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- /* ***** 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 _MPADECl3_H_
- #define _MPADECL3_H_
- #include "mpadec.h"
- #include "sconceal.h" // error concealment (for lost frames)
- typedef void (*SBT_FUNCTION_L3)(float *sample, unsigned char *pcm,
- int ch, float vbuf[][512], int vb_ptr[]);
- #define NBUF (8*1024)
- #define BUF_TRIGGER (NBUF-1500)
- ///////////////////////////////////////////////////////////////////////////////
- // CMpaDecoderL3 is the layer1 MPEG audio decoder
- ///////////////////////////////////////////////////////////////////////////////
- class CMpaDecoderL3 : public CMpaDecoder
- {
- public:
- CMpaDecoderL3();
- ~CMpaDecoderL3();
- // initialize Layer3 audio decoder
- // conceal_enable determines missing frame handling
- // for reformatted frames
- // if conceal_enable != 0, conceal by Wolfgang's method
- // if conceal_enable == 0, handle by null spectrum
- int audio_decode_init(MPEG_HEAD *h,
- int framebytes_arg,
- int reduction_code = 0,
- int transform_code = 0,
- int convert_code = 0,
- int freq_limit = 24000,
- int conceal_enable = 0);
- // decode standard Layer3 frame
- // no error concealment
- IN_OUT audio_decode(unsigned char *bs,
- unsigned char *pcm);
- // decode reformatted frames (self contained, main_data_begin=0)
- // call fails if main_data_begin != 0
- // optional error concealment for missing frames
- // missing frame indicated to decoder by size <= 0
- // if conceal_enable != 0, conceal by Wolfgang's method
- // if conceal_enable == 0, handle by null spectrum
- //
- IN_OUT audio_decode(unsigned char *bs,
- unsigned char *pcm,
- int size);
- #ifdef REFORMAT
- // test code, reformats to self contained frame, main_data_begin = 0
- IN_OUT audio_decode_reformat(unsigned char *bs, unsigned char *bs_out);
- private:
- unsigned char reformat_buf[2400]; /* Flawfinder: ignore */
- int reformat_bytes;
- int reformat_side_bytes;
- #endif
- private:
- IN_OUT L3audio_decode_MPEG1(unsigned char *bs,
- unsigned char *pcm);
- IN_OUT L3audio_decode_MPEG2(unsigned char *bs,
- unsigned char *pcm);
- void Xform(unsigned char *pcm, int igr);
- void Xform_mono(unsigned char *pcm, int igr);
- void Xform_dual(unsigned char *pcm, int igr);
- void Xform_dual_mono(unsigned char *pcm, int igr);
- void Xform_dual_right(unsigned char *pcm, int igr);
- int unpack_side_MPEG1();
- int unpack_side_MPEG2(int igr);
- // void unpack_main(unsigned char *buf, unsigned char *pcm, int igr);
- void unpack_main(unsigned char *buf, int igr);
- /*-- short portion is 3*x !! --*/
- int nBand[2][22]; /* [long/short][cb] */
- int sfBandIndex[2][22]; /* [long/short][cb] */
- BITDAT bitdat; /* JR - new (no longer C global) */
- float re_buf[192][3]; /* JR - new (no longer C global) */
- /*------------*/
- int mpeg25_flag;
- int stereo_flag;
- int igr;
- int band_limit;
- int band_limit21; // limit for sf band 21
- int band_limit12; // limit for sf band 12 short
- int band_limit_nsb; /* copy to global for hybrid */
- int gain_adjust; /* adjust gain e.g. cvt to mono */
- int id;
- int ncbl_mixed; /* number of long cb's in mixed block 8 or 6 */
- int half_outbytes;
- unsigned int zero_level_pcm;
- /* cb_info[igr][ch], compute by dequant, used by joint */
- CB_INFO cb_info[2][2];
- IS_SF_INFO is_sf_info; /* MPEG-2 intensity stereo */
- /*---------------------------------*/
- /* main data bit buffer */
- unsigned char buf[NBUF]; /* Flawfinder: ignore */
- int buf_ptr0;
- int buf_ptr1;
- int main_pos_bit;
- /*---------------------------------*/
- SIDE_INFO side_info;
- SCALEFACT sf[2][2]; /* [gr][ch] */
- int nsamp[2][2]; /* must start = 0, for nsamp[igr_prev] */
- float yout[576]; /* hybrid out, sbt in */
- /* sample buffer */
- /*- sample union of int/float sample[ch][gr][576] */
- /* static SAMPLE sample[2][2][576]; */
- SAMPLE sample[2][2][576];
- int iXform;
- SBT_FUNCTION_L3 sbt_L3;
- //======= concealment =========
- int conceal_flag;
- CConcealment *conceal[2];
- IN_OUT L3audio_decode_reformattedMPEG1(unsigned char *bs,
- unsigned char *pcm, int size);
- IN_OUT L3audio_decode_reformattedMPEG2(unsigned char *bs,
- unsigned char *pcm, int size);
-
- void conceal_insert(int igr);
- void conceal_fixup(int igr);
- #ifdef REFORMAT
- // test code, reformats frame
- IN_OUT L3reformat_MPEG1(unsigned char *bs, unsigned char *bs_out);
- // test code, reformats frame
- IN_OUT L3reformat_MPEG2(unsigned char *bs, unsigned char *bs_out);
- #endif
- };
- #endif