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150 lines
2.7 KiB
150 lines
2.7 KiB
5 years ago
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/*
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s_backend.c - sound hardware output
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Copyright (C) 2009 Uncle Mike
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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*/
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#ifndef XASH_DEDICATED
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#include "common.h"
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#if XASH_SOUND == SOUND_NULL
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#include "sound.h"
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#define SAMPLE_16BIT_SHIFT 1
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#define SECONDARY_BUFFER_SIZE 0x10000
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/*
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=======================================================================
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Global variables. Must be visible to window-procedure function
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so it can unlock and free the data block after it has been played.
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=======================================================================
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*/
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dma_t dma;
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void S_Activate( qboolean active )
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{
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}
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/*
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==================
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SNDDMA_Init
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Try to find a sound device to mix for.
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Returns false if nothing is found.
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==================
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*/
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qboolean SNDDMA_Init( void )
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{
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Msg( "Audio is not enabled\n" );
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return false;
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}
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/*
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==============
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SNDDMA_GetDMAPos
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return the current sample position (in mono samples read)
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inside the recirculating dma buffer, so the mixing code will know
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how many sample are required to fill it up.
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===============
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*/
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int SNDDMA_GetDMAPos( void )
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{
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return dma.samplepos;
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}
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/*
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==============
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SNDDMA_GetSoundtime
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update global soundtime
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===============
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*/
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int SNDDMA_GetSoundtime( void )
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{
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static int buffers, oldsamplepos;
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int samplepos, fullsamples;
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fullsamples = dma.samples / 2;
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// it is possible to miscount buffers
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// if it has wrapped twice between
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// calls to S_Update. Oh well.
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samplepos = SNDDMA_GetDMAPos();
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if( samplepos < oldsamplepos )
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{
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buffers++; // buffer wrapped
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if( paintedtime > 0x40000000 )
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{
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// time to chop things off to avoid 32 bit limits
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buffers = 0;
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paintedtime = fullsamples;
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S_StopAllSounds( true );
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}
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}
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oldsamplepos = samplepos;
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return (buffers * fullsamples + samplepos / 2);
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}
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/*
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==============
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SNDDMA_BeginPainting
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Makes sure dma.buffer is valid
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===============
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*/
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void SNDDMA_BeginPainting( void )
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{
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}
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/*
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==============
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SNDDMA_Submit
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Send sound to device if buffer isn't really the dma buffer
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Also unlocks the dsound buffer
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===============
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*/
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void SNDDMA_Submit( void )
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{
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}
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/*
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==============
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SNDDMA_Shutdown
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Reset the sound device for exiting
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===============
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*/
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void SNDDMA_Shutdown( void )
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{
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Con_Printf("Shutting down audio.\n");
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dma.initialized = false;
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if (dma.buffer) {
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Z_Free(dma.buffer);
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dma.buffer = NULL;
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}
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}
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#endif
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#endif
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