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ST-Computer Leser 1998 October
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1998-09-26
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Probe House DMA Sample Player
by William Wong, Feb 97
Probe House Software
WHAT IS IT?
Probe House DMA Player is a 8/16 bits, mono/stereo DMA sample player
for the STE, MSTE, TT & Falcon. It's a simple player - just pass it
some sample & it will play it. No controls to figure out!
WHAT SAMPLE FORMAT DOES IT SUPPORT?
Following audio format are automatically recognised:
1/ AU - Next/Sun Audio files ( u-law, 8/16 bits linear).
2/ AVR - Audio Visual Research ( 8/16 bits linear).
3/ WAV - Microsoft Wave ( u-law, a-law, 8/16 bits linear).
4/ SND - Sound file (8/16 bits linear).
5/ AIF - SGI/Apple IIF uncompressed (8/16 bits).
6/ IFF - AMIGA IIF uncompressed (8/16 bits).
7/ VOC - PC SoundBlaster uncompressed (8/16 bits).
8/ RAW - any data files: default to 8 bits, 8KHz & Mono.
Mono/stereo samples are support for all known formats.
WHAT PLAYBACK SPEED/FREQUENCY DOES IT SUPPORT?
All the popular playback speed are supported. PH Player preprocess the
sample for speed adjustment before playing. This incur some delay before
playing the sample. However, playback will suffer no delay.
The table below shows the sample speed and PH Player playback speed.
There are some error due to non standard DMA speed.
SAMPLE PHPLAYER %ERROR
5500 5563 1.14
6258 6258 0.00
7333 7510 2.41
8000 8344 4.30
11025 11125 0.91
12516 12516 0.00
16000 16689 4.30
18900 18775 0.66
22150 22251 0.46
25033 25033 0.00
32000 33377 4.30
37800 37550 0.66
44056 43807 0.56
44100 43807 0.56
48000 47980 0.04
50066 50066 0.00
HOW TO USE IT?
1/ Install it as a desktop icon.
To play any sample, just drag the sample file on to it.
2/ Double click it.
A dialog will appear. Select load to load your sample using the
file selector.
3/ Install it as a viewer for another program (eg. CAB).
It will play the sample without displaying any output onto the screen
on all of the 3 methods.
ALL THIS FOR FREE?
Yes... I really like to see more hits on my web page!
WHAT ELSE?
Wave ADPCM support.
DEVELOPEMENT INFO
This program was created & tested on a Falcon running both single
tasking (tos 4.04) and multitasking (AES 4.1). Sorry I don't have
MagiC so it's not tested ( I don't mind if some kind person donate
Magic 5 to me :-) ).
HISTORY
Jan 97: 1st release
Feb 97: multiple frequency support, AIFF data block fix.
Feb 97: VOC & Amiga IFF support.
CONTRIBUTIONS ARE WELCOME
What can I say, any contributions are welcome. Please send them to
William Wong
990 Bendemeer Road
Singapore 339942
Republic of Singapore
email: wongck@ti.com
http : //www.geocities.com/SiliconValley/6880/phsw.html