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-
- libmad - MPEG audio decoder library
- Copyright (C) 2000-2004 Underbit Technologies, Inc.
-
- $Id: CHANGES,v 1.14 2004/02/17 02:02:03 rob Exp $
-
-===============================================================================
-
-Version 0.15.1 (beta)
-
- * Updated to autoconf 2.59, automake 1.8.2, libtool 1.5.2.
-
- * Replaced Layer III IMDCT routine with one based on a faster algorithm,
- improving both speed and accuracy.
-
- * Improved portability of the Huffman table initialization.
-
- * Fixed a problem that could result in an assertion failure in layer3.c
- due to an invalid Layer III free format bitrate.
-
- * Improved the robustness of Layer II bitrate/mode combinations, and added
- a new MAD_ERROR_BADMODE error enum. The allowability of low-bitrate
- stereo streams is influenced by the --enable-strict-iso option to
- `configure'.
-
-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 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 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.
-
-===============================================================================
-