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mad - MPEG audio decoder Copyright (C) 2000 Robert Leslie $Id: CHANGES,v 1.35 2000/10/26 00:34:02 rob Exp $ =============================================================================== 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 internationalization support via GNU gettext. New French translation added courtesy of Gabriel Bouvigne. * Changed raw output module to use host-endian byte order. * Added --disable-mmap option to `configure' per suggestion of Erik Andersen. * Debug builds now link with -lefence, if available. * 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. * Added `madplay' support for filter chains. This could eventually be extended to support dynamically loaded filters. * Added a new optional fade-in filter. * Rewrote madplay.c to use GNU getopt, and added many new options (use `madplay --help' to see them all.) * Updated the man page for `madplay'. Version 0.11.4 (beta) * Fixed free format bitrate discovery. * Added Sun/NeXT audio file output module (audio_au.c). * Added 32-bit (really 24-bit) output support to OSS module. * Changed the timer implementation and extended its interface. * Relaxed output sample frequency match requirement. * Fixed endian assumption problem in audio_sun.c. * 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. * Joint stereo mode now shows LR indicator during playback. 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. * Added a dual channel output selection option. * Improved the OSS output module by falling back on 8-bit format if 16-bit is not available, and by using native 16-bit endianness. * PCM output is now dithered for better audio quality. A new runtime option can disable this feature. * Added a resampling feature for unsupported output sampling frequencies. * Centralized sample scaling and formatting in audio.c for the output modules. * Moved the empeg-car audio output support into a separate module. * Added bad-CRC frame muting code to madplay.c. * Improved sync discovery by checking for a sync word in the following frame. * Changed `madtime' to indicate average bitrates. * Reduced the ID3 genre table memory usage. * 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. * Improved the robustness of the Win32 audio output module. * 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. * Added a short man page for madplay. * Wrote most of the code for madtime. * Wrote code for an experimental multi-stream mixer `madmix' (--enable-experimental to add -x option support for this to madplay). 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. * Wrote new Win32 audio interface module. * 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. * Running madplay with no arguments now gives usage info. 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. * Added framework for ID3v2 support. * 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. * Added prefix parsing for output module selection. * Added audio_raw output module. * Rewrote madplay.c to use high-level interface. Version 0.9.7 (beta) * Added audio_hex module (--enable-debugging) for PCM-level debugging. * Fixed bug in audio_sun module; should work correctly now. * Added -Q (very quiet) option to omit bitstream error messages. * Reduced -v output by eliminating timing tenths. * Fixed problem configuring unsupported sample frequencies, and added user feedback. * Enhanced final frame count reporting to include playing time. * Cleaned up madplay.c somewhat. =============================================================================== |