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authorWarren Dukes <warren.dukes@gmail.com>2004-02-23 23:41:20 +0000
committerWarren Dukes <warren.dukes@gmail.com>2004-02-23 23:41:20 +0000
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+
+ libmad - MPEG audio decoder library
+ Copyright (C) 2000-2003 Underbit Technologies, Inc.
+
+ $Id: CHANGES,v 1.1 2003/08/14 03:57:13 shank Exp $
+
+===============================================================================
+
+Version 0.15.0 (beta)
+
+ * Updated to autoconf 2.57, automake 1.7.5, libtool 1.4.3.
+
+ * Added new mad_f_div() API routine.
+
+ * Added a 64th entry to the Layer I/Layer II scalefactor table, for better
+ compatibility with existing streams. The --enable-strict-iso option to
+ `configure' can be used to disable use of this entry.
+
+ * Modified the header decoding routine to allow the reserved emphasis
+ value, for better compatibility with existing streams. The
+ --enable-strict-iso option to `configure' can be used to restore the
+ previous behavior of reporting this value as an error.
+
+ * Added new MAD_EMPHASIS_RESERVED enumeration constant.
+
+ * Fixed a bug in the ARM version of mad_f_scale64() discovered by Andre
+ McCurdy.
+
+ * Rewrote PowerPC assembly for minor gains.
+
+ * Modified mad_timer_fraction() to avoid the possibility of division by
+ zero when 0 is passed as the second argument.
+
+ * Fixed a non-fatal problem caused by attempting to designate ancillary
+ bits in Layer III after a decoding error.
+
+ * Changed to build a shared library by default.
+
+ * Changed to use native Cygwin build by default; give --host=mingw32 to
+ `configure' to use MinGW (and avoid a dependency on the Cygwin DLL).
+
+Version 0.14.2 (beta)
+
+ * Changed Cygwin builds to use MinGW; resulting Win32 executables no
+ longer have a dependency on Cygwin DLLs.
+
+ * Added a new mad_stream_errorstr() API function to libmad for retrieving
+ a string description of the current error condition.
+
+Version 0.14.1 (beta)
+
+ * Updated config.guess and config.sub to latest upstream versions.
+
+ * Enabled libtool versioning rather than release numbering.
+
+ * Improved the documentation in minimad.c.
+
+ * Several other small fixes.
+
+Version 0.14.0 (beta)
+
+ * Added a 64-bit FPM negation operation to improve performance of subband
+ synthesis on some platforms.
+
+ * Improved MSVC++ portability and added MSVC++ project files.
+
+ * Added rounding to Layer III requantization for slightly better accuracy.
+
+Version 0.13.0 (beta)
+
+ * Ancillary data is now properly extracted from Layer III streams.
+
+ * Rewrote the Layer III joint stereo decoding routine to correct a major
+ MPEG-2 problem and a minor MPEG-1 problem decoding intensity stereo.
+
+ * Eliminated the dependency on sign-extending right shifts for Layer I and
+ Layer II.
+
+ * Renamed `private' field to `private_bits' for better C++ compatibility.
+
+ * Gratuitously renamed `sfreq' field to `samplerate' and
+ MAD_ERROR_BADSAMPLEFREQ constant to MAD_ERROR_BADSAMPLERATE.
+
+ * Added `samplerate' and `channels' fields to synth.pcm struct to allow
+ these to be different from the decoded frame, and for simpler access.
+
+ * Added new mad_stream_options() and mad_decoder_options() API entries for
+ special runtime decoding options.
+
+ * Added new MAD_OPTION_IGNORECRC and MAD_OPTION_HALFSAMPLERATE options.
+
+ * Added new MAD_FLAG_FREEFORMAT indicator flag.
+
+ * Fixed some bugs in the async decoder.
+
+ * Added a new mad_timer_multiply() API routine.
+
+ * Eliminated `+' from asm constraints under Intel for better compatibility
+ with some compilers.
+
+ * Fixed a PIC-related problem in libmad/imdct_l_arm.S.
+
+ * Eliminated a static variable to make libmad thread-safe.
+
+Version 0.12.5 (beta)
+
+ * Modified Layer III requantization to occur during Huffman decoding for
+ significant performance gains.
+
+ * Optimized short block IMDCT by eliminating redundant calculations.
+
+ * Made several other Layer III performance improvements; added
+ ASO_INTERLEAVE1, ASO_INTERLEAVE2, and ASO_ZEROCHECK
+ architecture-specific options for best performance on various
+ architectures.
+
+ * Optimized synthesis DCT to store result values as soon as they are
+ calculated.
+
+Version 0.12.4 (beta)
+
+ * New PowerPC fixed-point assembly courtesy of David Blythe.
+
+ * Reorganized fixed-point assembly routines for easier maintenance and
+ better performance.
+
+ * Improved performance of subband synthesis through better indexing and
+ fewer local variables.
+
+ * Added alias reduction for the lower two subbands of mixed short blocks,
+ per a report of ambiguity with ISO/IEC 11172-3 and for uniformity with
+ most other implementations. Also improved alias reduction performance
+ using multiply/accumulate.
+
+ * Added --enable-strict-iso option to `configure' to override best
+ accepted practices such as the alias reduction for mixed short blocks.
+
+ * Improved performance of Layer III IMDCT by using longer
+ multiply/accumulate runs where possible.
+
+Version 0.12.3 (beta)
+
+ * Added MPEG 2.5 support.
+
+ * Added preliminary support for parameterizing the binary point position
+ in the fixed-point representation.
+
+ * Added multiply/accumulate optimization to the Layer III IMDCT for long
+ blocks.
+
+ * Fixed a bug in the handling of Layer III mixed_block_flag.
+
+ * Fixed a configure problem when multiple -O CFLAGS are present.
+
+Version 0.12.2 (beta)
+
+ * Rearranged the synthesis polyphase filterbank memory vector for better
+ locality of reference, and rewrote mad_synth_frame() to accommodate,
+ resulting in improved performance.
+
+ * Discovered a combination of compiler optimization flags that further
+ improve performance.
+
+ * Changed some array references in layer3.c to pointer derefs.
+
+Version 0.12.1 (beta)
+
+ * Resolved the intensity + MS joint stereo issue (a simple bug).
+ OPT_ISKLUGE is no longer considered to be a kluge.
+
+ * Fixed another, hopefully last main_data memory bug.
+
+ * Split part of struct mad_frame into struct mad_header for convenience
+ and size.
+
+Version 0.12.0 (alpha)
+
+ * Changed the build environment to use automake and libtool. A libmad
+ shared library can now be built using the --enable-shared option to
+ `configure'.
+
+ * Added another callback to MAD's high-level decoder API after the frame
+ header has been read but before the frame's audio data is decoded.
+
+ * Streamlined header processing so that mad_frame_decode() can be called
+ with or without having already called mad_frame_header().
+
+ * Fixed some other header reading miscellany, including CRC handling and
+ free bitrate detection, and frame length verification with free
+ bitrates.
+
+ * Fixed a problem with Layer III free bitrates > 320 kbps. The main_data
+ buffer size should now be large enough to handle any size frame, by
+ virtue of the maximum possible part2_3_length.
+
+ * Further developed the async API; arbitrary messages can now be passed to
+ the subsidiary decoding process.
+
+ * Streamlined libmad/timer.c and extended its interface. It now has
+ support for video frame/field lengths, including output support for
+ drop-frame encoding.
+
+ * Replaced many constant integer preprocessor defines with enums.
+
+Version 0.11.4 (beta)
+
+ * Fixed free format bitrate discovery.
+
+ * Changed the timer implementation and extended its interface.
+
+ * Integrated Nicolas Pitre's patch for pre-shifting at compile-time and
+ for better multiply/accumulate code output.
+
+ * Applied Simon Burge's patch to imdct_l_arm.S for a.out compatibility.
+
+ * Added -mtune=strongarm for all ARM targets.
+
+Version 0.11.3 (beta)
+
+ * Added new --enable-speed and --enable-accuracy options for `configure'
+ to automatically select appropriate SSO/ASO options, et al.
+
+ * Modified subband synthesis to use multiply/accumulate optimization (if
+ available) for better speed and/or accuracy.
+
+ * Incorporated Andre McCurdy's changes for further rounding optimizations
+ in the rest of his code.
+
+Version 0.11.2 (beta)
+
+ * Incorporated Nicolas Pitre's ARM assembly and parameterized scaling
+ changes.
+
+ * Incorporated Andre McCurdy's ARM assembly optimization (used only if
+ --enable-aso is given to `configure' to enable architecture-specific
+ optimizations.)
+
+ * Reduced FPM_INTEL assembly to two instructions.
+
+ * Fixed accuracy problems with certain FPM modes in synth.c.
+
+ * Improved the accuracy of FPM_APPROX.
+
+ * Improved the accuracy of SSO.
+
+ * Improved sync discovery by checking for a sync word in the following
+ frame.
+
+ * Minor code clean-up.
+
+ * Added experimental rules for generating a libmad.so shared library.
+
+Version 0.11.1 (beta)
+
+ * Moved libmad code into a separate directory.
+
+ * Changed SSO to be disabled by default, as output accuracy is deemed to
+ be more important than speed in the general case.
+
+ * Fixed a bug in Layer III sanity checking that could cause a crash on
+ certain random data input.
+
+ * Extended the Layer III requantization table from 8191 to 8206 as some
+ encoders are known to use these values, even though ISO/IEC 11172-3
+ suggests the maximum should be 8191.
+
+Version 0.11.0 (beta)
+
+ * Implemented MPEG-2 extension to Lower Sampling Frequencies.
+
+ * Improved Layer III performance by avoiding IMDCT calculation when all
+ input samples are zero.
+
+ * Significantly reduced size of Layer II tables.
+
+Version 0.10.3 (beta)
+
+ * Improved SSO output quality.
+
+ * Made portable to cygwin.
+
+ * Localized memory references in III_huffdecode() for better performance.
+
+Version 0.10.2 (beta)
+
+ * Rewrote Layer III long block 36-point IMDCT routine for better
+ performance.
+
+ * Improved subband synthesis fixed-point games somewhat.
+
+Version 0.10.1 (beta)
+
+ * Added a subband synthesis optimization (SSO) which involves modifying
+ the fixed-point multiplication method during windowing. This produces
+ subtle differences in the output but improves performance greatly.
+
+ * Added I_STEREO and MS_STEREO flags to frame struct.
+
+ * Eliminated privately-used CRCFAILED flag.
+
+ * Fixed a bug where Layer III decoding could crash on some badly-formatted
+ (e.g. non-MPEG) bitstreams.
+
+ * Miscellaneous code clean-up.
+
+Version 0.10.0 (beta)
+
+ * Added SPARC fixed-point math support.
+
+ * Revamped libmad API for better high- and low-level support.
+
+ * Documented more of the code.
+
+ * Changed sync semantics such that new stream buffers are assumed to be
+ sync-aligned.
+
+ * Changed Layer III to dynamically allocate static memory so as not to
+ waste it (about 6.4K) when only decoding Layer I or Layer II.
+
+===============================================================================
+