#4379 - I.C.E - Sat Mar 29, 2003 9:52 am
I tried using the builtin sound driver in BIOS but i failed. Is there any sample source code or tutorials using and maybe explaining the calls? I have taken the structures directly from the CowBite document:
But I havn't understand everything. What is pcmbuf[] for? What are the "User access prohibited" fields for?
I have called IRQ 0x1a once and then i call 0x1d and 0x1c in my vblank irq handler.[/quote]
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To this day, many C programmers believe that "strong typing" just means pounding extra hard on the keyboard.
- Peter van der Linden
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typedef struct tSoundArea { u32 ident; //Flag the system checks to see if the work area has been //initialized/currently being accessed. vu8 DmaCount; //User access prohibited u8 reverb; //Variable for applying reverb effects to direct sound u16 d1; //User access prohibited void (*func)(); //User access prohibited int intp; //User access prohibited void* NoUse; //User access prohibited SoundChannel vchn[MAX]; //Array of Direct Sound channel structures. s8 pcmbuf[PCM_BF*2]; //?? } SoundArea; typedef struct tSoundChannel { u8 sf; //Channel status. When 0 sound it is stopped. To start sound, set other //parameters and then write 0x80h. Logical OR 0x40 for a key-off, or //write zero for a pause. The use of other bits is prohibited. u8 r1; //User access prohibited u8 rv; //Sound volume output to right side u8 lv; //Sound volume output to left side u8 at; //The attack value of the envelope. u8 de; //The decay value of the envelope. u8 su; //The sustain value of the envelope. u8 re; //The release value of the envelope. Key-off to enter this state. u8 r2[4]; //User access prohibited u32 fr; //The frequency of the produced sound. WaveData* wp; //Pointer to the sound's waveform data. u32 r3[6]; // User access prohibited u8 r4[4]; //User access prohibited } SoundChannel; typedef struct tWaveData { u16 type; //Indicates the data type. This is currently not used. u16 stat; //0 - non-looped 0x4000 - forward loop u32 freq; //Frequency. u32 loop; //Loop pointer (start of loop) u32 size; //Number of samples (end position) s8 data[]; //The actual waveform data. Takes (number of samples+1)bytes of 8bit //signed linear uncompressed data. The last byte is zero for a non-looped //waveform, and the same value as the loop pointer data for a looped waveform. } WaveData; |
But I havn't understand everything. What is pcmbuf[] for? What are the "User access prohibited" fields for?
I have called IRQ 0x1a once and then i call 0x1d and 0x1c in my vblank irq handler.[/quote]
_________________
To this day, many C programmers believe that "strong typing" just means pounding extra hard on the keyboard.
- Peter van der Linden