mirror of
https://github.com/cookiengineer/audacity
synced 2025-10-31 14:13:50 +01:00
339 lines
11 KiB
Plaintext
339 lines
11 KiB
Plaintext
|
|
libmad - MPEG audio decoder library
|
|
Copyright (C) 2000-2004 Underbit Technologies, Inc.
|
|
|
|
$Id: CHANGES,v 1.2 2005-09-12 07:01:29 dmazzoni 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.
|
|
|
|
===============================================================================
|
|
|