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Diffstat (limited to 'libmad/src/CHANGES')
| -rw-r--r-- | libmad/src/CHANGES | 338 |
1 files changed, 338 insertions, 0 deletions
diff --git a/libmad/src/CHANGES b/libmad/src/CHANGES new file mode 100644 index 0000000..9291760 --- /dev/null +++ b/libmad/src/CHANGES @@ -0,0 +1,338 @@ + + 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. + +=============================================================================== + |