0,0 → 1,57 |
/* |
* SoundBlaster routines for DSP driving |
* |
* Copyright (C) 2022 Mateusz Viste |
* |
* Permission is hereby granted, free of charge, to any person obtaining a copy |
* of this software and associated documentation files (the "Software"), to |
* deal in the Software without restriction, including without limitation the |
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or |
* sell copies of the Software, and to permit persons to whom the Software is |
* furnished to do so, subject to the following conditions: |
* |
* The above copyright notice and this permission notice shall be included in |
* all copies or substantial portions of the Software. |
* |
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS |
* IN THE SOFTWARE. |
*/ |
|
#ifndef MDR_SBDIGI_H |
#define MDR_SBDIGI_H |
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struct sbdigi_ctx; |
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/* initializes the SoundBlaster DSP chip |
* blaster must point to a BLASTER environment string (like "A220 I5 D1") |
* returns a pointer to a context, NULL on error |
* NOTE: DSP's state after initialization may or may not be muted, depending |
* on the exact hardware revision. use sbdigi_spkoff() to make sure it is |
* unmuted */ |
struct sbdigi_ctx *sbdigi_init(const char *blaster); |
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/* unmutes the SoundBlaster DSP */ |
void sbdigi_spkon(struct sbdigi_ctx *ctx); |
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/* mutes the SoundBlaster DSP */ |
void sbdigi_spkoff(struct sbdigi_ctx *ctx); |
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/* plays a short sample |
* ctx - DSP context, as returned by sbdigi_init() |
* buf - pointer to sample data (must be PCM, 8000 Hz, mono, 8-bit unsigned |
* len - length of the sample, in bytes |
* NOTES: this routine uses DMA to transfer memory. This has two implications: |
* 1. the routine will return almost immediately, while the sound is playing |
* 2. sample data must be contained in a buffer that does NOT cross a 64K page |
* because DMA transfers are unable to cross 64K boundaries */ |
void sbdigi_playsample(struct sbdigi_ctx *ctx, void *buf, unsigned short len); |
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/* shuts down the DSP and frees context memory */ |
void sbdigi_quit(struct sbdigi_ctx *ctx); |
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#endif |