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Diffstat (limited to 'src/wavpack/readme.txt')
| -rw-r--r-- | src/wavpack/readme.txt | 68 |
1 files changed, 0 insertions, 68 deletions
diff --git a/src/wavpack/readme.txt b/src/wavpack/readme.txt deleted file mode 100644 index 4ccbdf42..00000000 --- a/src/wavpack/readme.txt +++ /dev/null @@ -1,68 +0,0 @@ -//////////////////////////////////////////////////////////////////////////// -// **** WAVPACK **** // -// Hybrid Lossless Wavefile Compressor // -// Copyright (c) 1998 - 2006 Conifer Software. // -// All Rights Reserved. // -// Distributed under the BSD Software License (see license.txt) // -//////////////////////////////////////////////////////////////////////////// - -This package contains a tiny version of the WavPack 4.40 decoder that might -be used in a "resource limited" CPU environment or form the basis for a -hardware decoding implementation. It is packaged with a demo command-line -program that accepts a WavPack audio file on stdin and outputs a RIFF wav -file to stdout. The program is standard C, and a win32 executable is -included which was compiled under MS Visual C++ 6.0 using this command: - -cl /O1 /DWIN32 wvfilter.c wputils.c unpack.c float.c metadata.c words.c bits.c - -WavPack data is read with a stream reading callback. No direct seeking is -provided for, but it is possible to start decoding anywhere in a WavPack -stream. In this case, WavPack will be able to provide the sample-accurate -position when it synchs with the data and begins decoding. The WIN32 macro -is used for Windows to force the stdin and stdout streams to be binary mode. - -Compared to the previous version, this library has been optimized somewhat -for improved performance in exchange for slightly larger code size. The -library also now includes hand-optimized assembly language versions of the -decorrelation functions for both the ColdFire (w/EMAC) and ARM processors. - -For demonstration purposes this uses a single static copy of the -WavpackContext structure, so obviously it cannot be used for more than one -file at a time. Also, this decoder will not handle "correction" files, plays -only the first two channels of multi-channel files, and is limited in -resolution in some large integer or floating point files (but always -provides at least 24 bits of resolution). It also will not accept WavPack -files from before version 4.0. - -The previous version of this library would handle float files by returning -32-bit floating-point data (even though no floating point math was used). -Because this library would normally be used for simply playing WavPack -files where lossless performance (beyond 24-bits) is not relevant, I have -changed this behavior. Now, these files will generate clipped 24-bit data. -The MODE_FLOAT flag will still be returned by WavpackGetMode(), but the -BitsPerSample and BytesPerSample queries will be 24 and 3, respectfully. -What this means is that an application that can handle 24-bit data will -now be able to handle floating point data (assuming that the MODE_FLOAT -flag is ignored). - -To make this code viable on the greatest number of hardware platforms, the -following are true: - - speed is about 5x realtime on an AMD K6 300 MHz - ("high" mode 16/44 stereo; normal mode is about twice that fast) - - no floating-point math required; just 32b * 32b = 32b int multiply - - large data areas are static and less than 4K total - executable code and tables are less than 40K - no malloc / free usage - -To maintain compatibility on various platforms, the following conventions -are used: - - a "char" must be exactly 8-bits - a "short" must be exactly 16-bits - an "int" must be at least 16-bits, but may be larger - the "long" type is not used to avoid problems with 64-bit compilers - -Questions or comments should be directed to david@wavpack.com |