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