| 1 | Audio File Library Development Notes |
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| 2 | Thursday, 25 October 2001 |
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| 3 | Michael Pruett <mpruett@sgi.com> |
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| 4 | |
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| 5 | ---- |
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| 6 | |
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| 7 | The Audio File Library supports CCITT G.711 mu-law and A-law |
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| 8 | compression. Many compressed data formats are not supported. This is |
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| 9 | currently the most important issue to address. |
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| 10 | |
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| 11 | Error handling is at the present quite robust, but more work can always |
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| 12 | be done in this area. |
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| 13 | |
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| 14 | SGI's Audio File Library on IRIX implements the following formats which |
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| 15 | this version of the library does not: |
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| 16 | |
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| 17 | MPEG1 audio bitstream |
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| 18 | Sound Designer II |
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| 19 | Audio Visual Research |
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| 20 | Amiga IFF/8SVX |
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| 21 | SampleVision |
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| 22 | VOC |
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| 23 | SoundFont2 |
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| 24 | |
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| 25 | I plan to implement some of these as time permits. Sound Designer |
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| 26 | II is out of the question because of its dependency upon Macintosh |
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| 27 | resource forks. Handling these files on Unix systems is simply not |
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| 28 | worth the effort. |
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| 29 | |
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| 30 | ---- |
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| 31 | |
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| 32 | This version of the Audio File Library has been tested under the |
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| 33 | following operating environments: |
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| 34 | |
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| 35 | mips-sgi-irix6.5 / IRIX 6.5 (MIPSpro cc 7.3.1.2m) |
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| 36 | mips-sgi-irix6.5 / IRIX 6.5 (MIPSpro cc 7.2.1.3m) |
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| 37 | mips-sgi-irix6.5 / IRIX 6.5 (gcc 2.8.1) |
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| 38 | i686-pc-linux-gnu / Debian GNU/Linux 2.2 (gcc 2.95.2) |
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| 39 | i686-pc-linux-gnu / Red Hat Linux 7.1 (gcc 2.96) |
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| 40 | i686-pc-linux-gnu / Red Hat Linux 6.1 (egcs 1.1.2) |
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| 41 | powerpc-apple-linux-gnu / Debian GNU/Linux (gcc 2.95.4) |
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| 42 | |
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| 43 | The version of GNU cc shipped with some versions of Red Hat 7.0 [1] is |
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| 44 | known to fail on an internal compiler error while compiling some of the |
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| 45 | test programs: |
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| 46 | |
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| 47 | gcc -DHAVE_CONFIG_H -I. -I. -I.. -I../libaudiofile -g -O2 -c twentyfour.c |
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| 48 | twentyfour.c: In function `main': |
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| 49 | twentyfour.c:231: Internal error: Floating point exception. |
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| 50 | |
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| 51 | Updated versions of GNU cc available from Red Hat fix this problem. |
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| 52 | This problem is not present in Red Hat 7.1 [2]. |
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| 53 | |
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| 54 | [1] On a Red Hat 7.0 system, gcc has the following version information: |
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| 55 | % gcc -v |
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| 56 | Reading specs from /usr/lib/gcc-lib/i386-redhat-linux/2.96/specs |
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| 57 | gcc version 2.96 20000731 (Red Hat Linux 7.0) |
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| 58 | |
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| 59 | [2] On a Red Hat 7.1 system, gcc has the following version information: |
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| 60 | % gcc -v |
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| 61 | Reading specs from /usr/lib/gcc-lib/i386-redhat-linux/2.96/specs |
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| 62 | gcc version 2.96 20000731 (Red Hat Linux 7.1 2.96-81) |
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