339 lines
11 KiB
Plaintext
339 lines
11 KiB
Plaintext
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libmad - MPEG audio decoder library
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Copyright (C) 2000-2004 Underbit Technologies, Inc.
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$Id: CHANGES,v 1.14 2004/02/17 02:02:03 rob Exp $
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===============================================================================
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Version 0.15.1 (beta)
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* Updated to autoconf 2.59, automake 1.8.2, libtool 1.5.2.
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* Replaced Layer III IMDCT routine with one based on a faster algorithm,
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improving both speed and accuracy.
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* Improved portability of the Huffman table initialization.
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* Fixed a problem that could result in an assertion failure in layer3.c
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due to an invalid Layer III free format bitrate.
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* Improved the robustness of Layer II bitrate/mode combinations, and added
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a new MAD_ERROR_BADMODE error enum. The allowability of low-bitrate
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stereo streams is influenced by the --enable-strict-iso option to
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`configure'.
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Version 0.15.0 (beta)
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* Updated to autoconf 2.57, automake 1.7.5, libtool 1.4.3.
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* Added new mad_f_div() API routine.
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* Added a 64th entry to the Layer I/Layer II scalefactor table, for better
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compatibility with existing streams. The --enable-strict-iso option to
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`configure' can be used to disable use of this entry.
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* Modified the header decoding routine to allow the reserved emphasis
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value, for better compatibility with existing streams. The
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--enable-strict-iso option to `configure' can be used to restore the
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previous behavior of reporting this value as an error.
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* Added new MAD_EMPHASIS_RESERVED enumeration constant.
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* Fixed a bug in the ARM version of mad_f_scale64() discovered by Andre
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McCurdy.
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* Rewrote PowerPC assembly for minor gains.
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* Modified mad_timer_fraction() to avoid the possibility of division by
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zero when 0 is passed as the second argument.
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* Fixed a non-fatal problem caused by attempting to designate ancillary
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bits in Layer III after a decoding error.
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* Changed to build a shared library by default.
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* Changed to use native Cygwin build by default; give --host=mingw32 to
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`configure' to use MinGW (and avoid a dependency on the Cygwin DLL).
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Version 0.14.2 (beta)
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* Changed Cygwin builds to use MinGW; resulting Win32 executables no
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longer have a dependency on Cygwin DLLs.
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* Added a new mad_stream_errorstr() API function to libmad for retrieving
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a string description of the current error condition.
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Version 0.14.1 (beta)
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* Updated config.guess and config.sub to latest upstream versions.
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* Enabled libtool versioning rather than release numbering.
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* Improved the documentation in minimad.c.
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* Several other small fixes.
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Version 0.14.0 (beta)
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* Added a 64-bit FPM negation operation to improve performance of subband
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synthesis on some platforms.
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* Improved MSVC++ portability and added MSVC++ project files.
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* Added rounding to Layer III requantization for slightly better accuracy.
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Version 0.13.0 (beta)
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* Ancillary data is now properly extracted from Layer III streams.
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* Rewrote the Layer III joint stereo decoding routine to correct a major
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MPEG-2 problem and a minor MPEG-1 problem decoding intensity stereo.
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* Eliminated the dependency on sign-extending right shifts for Layer I and
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Layer II.
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* Renamed `private' field to `private_bits' for better C++ compatibility.
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* Gratuitously renamed `sfreq' field to `samplerate' and
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MAD_ERROR_BADSAMPLEFREQ constant to MAD_ERROR_BADSAMPLERATE.
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* Added `samplerate' and `channels' fields to synth.pcm struct to allow
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these to be different from the decoded frame, and for simpler access.
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* Added new mad_stream_options() and mad_decoder_options() API entries for
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special runtime decoding options.
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* Added new MAD_OPTION_IGNORECRC and MAD_OPTION_HALFSAMPLERATE options.
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* Added new MAD_FLAG_FREEFORMAT indicator flag.
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* Fixed some bugs in the async decoder.
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* Added a new mad_timer_multiply() API routine.
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* Eliminated `+' from asm constraints under Intel for better compatibility
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with some compilers.
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* Fixed a PIC-related problem in imdct_l_arm.S.
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* Eliminated a static variable to make libmad thread-safe.
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Version 0.12.5 (beta)
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* Modified Layer III requantization to occur during Huffman decoding for
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significant performance gains.
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* Optimized short block IMDCT by eliminating redundant calculations.
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* Made several other Layer III performance improvements; added
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ASO_INTERLEAVE1, ASO_INTERLEAVE2, and ASO_ZEROCHECK
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architecture-specific options for best performance on various
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architectures.
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* Optimized synthesis DCT to store result values as soon as they are
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calculated.
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Version 0.12.4 (beta)
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* New PowerPC fixed-point assembly courtesy of David Blythe.
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* Reorganized fixed-point assembly routines for easier maintenance and
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better performance.
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* Improved performance of subband synthesis through better indexing and
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fewer local variables.
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* Added alias reduction for the lower two subbands of mixed short blocks,
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per a report of ambiguity with ISO/IEC 11172-3 and for uniformity with
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most other implementations. Also improved alias reduction performance
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using multiply/accumulate.
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* Added --enable-strict-iso option to `configure' to override best
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accepted practices such as the alias reduction for mixed short blocks.
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* Improved performance of Layer III IMDCT by using longer
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multiply/accumulate runs where possible.
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Version 0.12.3 (beta)
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* Added MPEG 2.5 support.
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* Added preliminary support for parameterizing the binary point position
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in the fixed-point representation.
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* Added multiply/accumulate optimization to the Layer III IMDCT for long
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blocks.
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* Fixed a bug in the handling of Layer III mixed_block_flag.
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* Fixed a configure problem when multiple -O CFLAGS are present.
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Version 0.12.2 (beta)
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* Rearranged the synthesis polyphase filterbank memory vector for better
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locality of reference, and rewrote mad_synth_frame() to accommodate,
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resulting in improved performance.
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* Discovered a combination of compiler optimization flags that further
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improve performance.
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* Changed some array references in layer3.c to pointer derefs.
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Version 0.12.1 (beta)
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* Resolved the intensity + MS joint stereo issue (a simple bug).
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OPT_ISKLUGE is no longer considered to be a kluge.
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* Fixed another, hopefully last main_data memory bug.
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* Split part of struct mad_frame into struct mad_header for convenience
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and size.
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Version 0.12.0 (alpha)
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* Changed the build environment to use automake and libtool. A libmad
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shared library can now be built using the --enable-shared option to
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`configure'.
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* Added another callback to MAD's high-level decoder API after the frame
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header has been read but before the frame's audio data is decoded.
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* Streamlined header processing so that mad_frame_decode() can be called
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with or without having already called mad_frame_header().
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* Fixed some other header reading miscellany, including CRC handling and
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free bitrate detection, and frame length verification with free
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bitrates.
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* Fixed a problem with Layer III free bitrates > 320 kbps. The main_data
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buffer size should now be large enough to handle any size frame, by
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virtue of the maximum possible part2_3_length.
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* Further developed the async API; arbitrary messages can now be passed to
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the subsidiary decoding process.
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* Streamlined timer.c and extended its interface. It now has support for
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video frame/field lengths, including output support for drop-frame
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encoding.
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* Replaced many constant integer preprocessor defines with enums.
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Version 0.11.4 (beta)
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* Fixed free format bitrate discovery.
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* Changed the timer implementation and extended its interface.
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* Integrated Nicolas Pitre's patch for pre-shifting at compile-time and
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for better multiply/accumulate code output.
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* Applied Simon Burge's patch to imdct_l_arm.S for a.out compatibility.
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* Added -mtune=strongarm for all ARM targets.
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Version 0.11.3 (beta)
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* Added new --enable-speed and --enable-accuracy options for `configure'
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to automatically select appropriate SSO/ASO options, et al.
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* Modified subband synthesis to use multiply/accumulate optimization (if
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available) for better speed and/or accuracy.
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* Incorporated Andre McCurdy's changes for further rounding optimizations
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in the rest of his code.
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Version 0.11.2 (beta)
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* Incorporated Nicolas Pitre's ARM assembly and parameterized scaling
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changes.
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* Incorporated Andre McCurdy's ARM assembly optimization (used only if
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--enable-aso is given to `configure' to enable architecture-specific
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optimizations.)
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* Reduced FPM_INTEL assembly to two instructions.
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* Fixed accuracy problems with certain FPM modes in synth.c.
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* Improved the accuracy of FPM_APPROX.
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* Improved the accuracy of SSO.
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* Improved sync discovery by checking for a sync word in the following
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frame.
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* Minor code clean-up.
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* Added experimental rules for generating a libmad.so shared library.
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Version 0.11.1 (beta)
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* Moved libmad code into a separate directory.
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* Changed SSO to be disabled by default, as output accuracy is deemed to
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be more important than speed in the general case.
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* Fixed a bug in Layer III sanity checking that could cause a crash on
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certain random data input.
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* Extended the Layer III requantization table from 8191 to 8206 as some
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encoders are known to use these values, even though ISO/IEC 11172-3
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suggests the maximum should be 8191.
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Version 0.11.0 (beta)
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* Implemented MPEG-2 extension to Lower Sampling Frequencies.
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* Improved Layer III performance by avoiding IMDCT calculation when all
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input samples are zero.
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* Significantly reduced size of Layer II tables.
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Version 0.10.3 (beta)
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* Improved SSO output quality.
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* Made portable to cygwin.
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* Localized memory references in III_huffdecode() for better performance.
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Version 0.10.2 (beta)
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* Rewrote Layer III long block 36-point IMDCT routine for better
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performance.
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* Improved subband synthesis fixed-point games somewhat.
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Version 0.10.1 (beta)
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* Added a subband synthesis optimization (SSO) which involves modifying
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the fixed-point multiplication method during windowing. This produces
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subtle differences in the output but improves performance greatly.
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* Added I_STEREO and MS_STEREO flags to frame struct.
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* Eliminated privately-used CRCFAILED flag.
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* Fixed a bug where Layer III decoding could crash on some badly-formatted
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(e.g. non-MPEG) bitstreams.
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* Miscellaneous code clean-up.
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Version 0.10.0 (beta)
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* Added SPARC fixed-point math support.
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* Revamped libmad API for better high- and low-level support.
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* Documented more of the code.
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* Changed sync semantics such that new stream buffers are assumed to be
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sync-aligned.
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* Changed Layer III to dynamically allocate static memory so as not to
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waste it (about 6.4K) when only decoding Layer I or Layer II.
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===============================================================================
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