mirror of
https://github.com/cookiengineer/audacity
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90 lines
5.6 KiB
Plaintext
90 lines
5.6 KiB
Plaintext
/**********************************************************************
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* ISO MPEG Audio Subgroup Software Simulation Group (1996)
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* ISO 13818-3 MPEG-2 Audio Encoder - Lower Sampling Frequency Extension
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*
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* $Id$
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*
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* $Log$
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* Revision 1.1 2005/11/15 16:04:26 nhumfrey
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* Changed suffix for files.
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*
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* Revision 1.1.1.1 2005/04/15 01:10:20 nhumfrey
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* Initial import.
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*
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* Revision 1.1 1996/02/14 04:04:23 rowlands
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* Initial revision
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*
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* Received from Mike Coleman
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**********************************************************************/
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/**********************************************************************
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* date programmers comment *
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* 3/01/91 Douglas Wong, start of version 1.1 records *
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* Davis Pan *
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* 3/06/91 Douglas Wong rename: setup.h to endef.h *
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* efilter to enfilter *
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* ewindow to enwindow *
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* integrated "quantizer", "scalefactor",*
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* and "transmission" files *
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* update routine "window_subband" *
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* 3/31/91 Bill Aspromonte replaced read_filter by *
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* create_an_filter *
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* 5/10/91 W. Joseph Carter Ported to Macintosh and Unix. *
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* Incorporated Jean-Georges Fritsch's *
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* "bitstream.c" package. *
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* Incorporated Bill Aspromonte's *
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* filterbank coefficient matrix *
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* calculation routines and added *
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* roundoff to coincide with specs. *
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* Modified to strictly adhere to *
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* encoded bitstream specs, including *
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* "Berlin changes". *
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* Modified PCM sound file handling to *
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* process all incoming samples and fill *
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* out last encoded frame with zeros *
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* (silence) if needed. *
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* Located and fixed numerous software *
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* bugs and table data errors. *
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* 19jun91 dpwe (Aware) moved "alloc_*" reader to common.c *
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* Globals sblimit, alloc replaced by new*
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* struct 'frame_params' passed as arg. *
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* Added JOINT STEREO coding, layers I,II*
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* Affects: *_bit_allocation, *
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* subband_quantization, encode_bit_alloc*
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* sample_encoding *
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* 6/10/91 Earle Jennings modified II_subband_quantization to *
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* resolve type cast problem for MS_DOS *
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* 6/11/91 Earle Jennings modified to avoid overflow on MS_DOS *
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* in routine filter_subband *
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* 7/10/91 Earle Jennings port to MsDos from MacIntosh version *
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* 8/ 8/91 Jens Spille Change for MS-C6.00 *
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*10/ 1/91 S.I. Sudharsanan, Ported to IBM AIX platform. *
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* Don H. Lee, *
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* Peter W. Farrett *
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*10/ 3/91 Don H. Lee implemented CRC-16 error protection *
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* newly introduced function encode_CRC *
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*11/ 8/91 Kathy Wang Documentation of code *
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* All variablenames are referred to *
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* with surrounding pound (#) signs *
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* 2/11/92 W. Joseph Carter Ported new code to Macintosh. Most *
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* important fixes involved changing *
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* 16-bit ints to long or unsigned in *
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* bit alloc routines for quant of 65535 *
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* and passing proper function args. *
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* Removed "Other Joint Stereo" option *
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* and made bitrate be total channel *
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* bitrate, irrespective of the mode. *
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* Fixed many small bugs & reorganized. *
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* 6/16/92 Shaun Astarabadi Changed I_scale_factor_calc() and *
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* II_scale_factor_calc() to use scale *
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* factor 0 thru 62 only and not to *
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* encode index 63 into the bit stream. *
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* 7/27/92 Mike Li (re-)Port to MS-DOS *
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* 9/22/92 jddevine@aware.com Fixed _scale_factor_calc() defs *
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* 3/31/93 Giogio Dimino changed II_a_bit_allocation() from: *
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* if( ad > ...) to if(ad >= ...) *
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* 8/05/93 TEST changed I_a_bit_allocation() from: *
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* if( ad > ...) to if(ad >= ...) *
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* 8/02/95 mc@fivebats.com Changed audio file reading code to *
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* read samples big-endian *
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*10/15/95 mc@fivebats.com Modified get_audio() for layer3-LSF *
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**********************************************************************/ |