mirror of
https://bitbucket.org/CPMADevs/cnq3
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312 lines
7.2 KiB
C++
312 lines
7.2 KiB
C++
/*
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===========================================================================
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Copyright (C) 1999-2005 Id Software, Inc.
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This file is part of Quake III Arena source code.
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Quake III Arena source code is free software; you can redistribute it
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and/or modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of the License,
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or (at your option) any later version.
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Quake III Arena source code is distributed in the hope that it will be
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useful, 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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You should have received a copy of the GNU General Public License
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along with Quake III Arena source code; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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===========================================================================
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*/
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// snd_mix.c -- portable code to mix sounds for snd_dma.c
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#include "client.h"
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#include "snd_local.h"
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static portable_samplepair_t paintbuffer[PAINTBUFFER_SIZE];
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static int snd_vol;
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static int* snd_p;
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static int snd_linear_count;
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static short* snd_out;
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static void S_WriteLinearBlastStereo16()
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{
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int v1, v2;
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for (int i = 0; i < snd_linear_count; i += 2)
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{
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v1 = snd_p[i] >> 8;
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if (v1 > 32767)
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v1 = 32767;
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else if (v1 < -32768)
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v1 = -32768;
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v2 = snd_p[i+1] >> 8;
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if (v2 > 32767)
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v2 = 32767;
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else if (v2 < -32768)
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v2 = -32768;
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*(uint32_t*)(&snd_out[i]) = (v2 << 16) | (v1 & 0xFFFF);
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}
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}
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static void S_TransferStereo16( unsigned long* pbuf, int endtime )
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{
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int lpos;
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int ls_paintedtime;
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snd_p = (int *) paintbuffer;
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ls_paintedtime = s_paintedtime;
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while (ls_paintedtime < endtime)
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{
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// handle recirculating buffer issues
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lpos = ls_paintedtime & ((dma.samples>>1)-1);
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snd_out = (short *) pbuf + (lpos<<1);
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snd_linear_count = (dma.samples>>1) - lpos;
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if (ls_paintedtime + snd_linear_count > endtime)
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snd_linear_count = endtime - ls_paintedtime;
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snd_linear_count <<= 1;
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// write a linear blast of samples
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S_WriteLinearBlastStereo16();
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snd_p += snd_linear_count;
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ls_paintedtime += (snd_linear_count>>1);
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if ( CL_VideoRecording() ) {
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CL_WriteAVIAudioFrame( (byte *)snd_out, snd_linear_count << 1 );
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}
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}
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}
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static void S_TransferPaintBuffer( int endtime )
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{
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int out_idx;
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int count;
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int out_mask;
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int *p;
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int step;
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int val;
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unsigned long *pbuf;
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pbuf = (unsigned long *)dma.buffer;
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if ( s_testsound->integer ) {
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int i;
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// write a fixed sine wave
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count = (endtime - s_paintedtime);
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for (i=0 ; i<count ; i++)
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paintbuffer[i].left = paintbuffer[i].right = sin((s_paintedtime+i)*0.1)*20000*256;
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}
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if (dma.samplebits == 16 && dma.channels == 2)
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{ // optimized case
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S_TransferStereo16 (pbuf, endtime);
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}
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else
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{ // general case
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p = (int *) paintbuffer;
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count = (endtime - s_paintedtime) * dma.channels;
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out_mask = dma.samples - 1;
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out_idx = s_paintedtime * dma.channels & out_mask;
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step = 3 - dma.channels;
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if (dma.samplebits == 16)
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{
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short *out = (short *) pbuf;
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while (count--)
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{
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val = *p >> 8;
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p+= step;
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if (val > 0x7fff)
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val = 0x7fff;
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else if (val < -32768)
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val = -32768;
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out[out_idx] = val;
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out_idx = (out_idx + 1) & out_mask;
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}
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}
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else if (dma.samplebits == 8)
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{
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unsigned char *out = (unsigned char *) pbuf;
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while (count--)
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{
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val = *p >> 8;
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p+= step;
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if (val > 0x7fff)
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val = 0x7fff;
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else if (val < -32768)
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val = -32768;
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out[out_idx] = (val>>8) + 128;
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out_idx = (out_idx + 1) & out_mask;
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}
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}
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}
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}
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/*
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===============================================================================
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CHANNEL MIXING
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===============================================================================
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*/
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static void S_PaintChannelFrom16( channel_t* ch, const sfx_t* sfx, int count, int sampleOffset, int bufferOffset )
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{
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portable_samplepair_t* samp = &paintbuffer[ bufferOffset ];
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const sndBuffer* chunk = sfx->soundData;
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while (sampleOffset >= SND_CHUNK_SIZE) {
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chunk = chunk->next;
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sampleOffset -= SND_CHUNK_SIZE;
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if (!chunk) {
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chunk = sfx->soundData;
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}
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}
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int leftvol = ch->leftvol * snd_vol;
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int rightvol = ch->rightvol * snd_vol;
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const short* samples = chunk->sndChunk;
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for (int i = 0; i < count; ++i) {
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int data = samples[sampleOffset++];
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samp[i].left += (data * leftvol) >> 8;
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samp[i].right += (data * rightvol) >> 8;
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if (sampleOffset == SND_CHUNK_SIZE) {
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chunk = chunk->next;
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samples = chunk->sndChunk;
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sampleOffset = 0;
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}
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}
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}
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/*
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===================
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S_PaintChannels
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===================
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*/
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void S_PaintChannels( int endtime ) {
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int i;
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int end;
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channel_t *ch;
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const sfx_t* sfx;
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int ltime, count;
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int sampleOffset;
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snd_vol = s_volume->value*255;
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//Com_Printf ("%i to %i\n", s_paintedtime, endtime);
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while ( s_paintedtime < endtime ) {
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// if paintbuffer is smaller than DMA buffer
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// we may need to fill it multiple times
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end = endtime;
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if ( endtime - s_paintedtime > PAINTBUFFER_SIZE ) {
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end = s_paintedtime + PAINTBUFFER_SIZE;
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}
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// clear the paint buffer to either music or zeros
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if ( s_rawend < s_paintedtime ) {
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if ( s_rawend ) {
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//Com_DPrintf ("background sound underrun\n");
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}
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Com_Memset(paintbuffer, 0, (end - s_paintedtime) * sizeof(portable_samplepair_t));
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} else {
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// copy from the streaming sound source
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int s;
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int stop;
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stop = (end < s_rawend) ? end : s_rawend;
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for ( i = s_paintedtime ; i < stop ; i++ ) {
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s = i&(MAX_RAW_SAMPLES-1);
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paintbuffer[i-s_paintedtime] = s_rawsamples[s];
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}
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// if (i != end)
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// Com_Printf ("partial stream\n");
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// else
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// Com_Printf ("full stream\n");
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for ( ; i < end ; i++ ) {
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paintbuffer[i-s_paintedtime].left =
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paintbuffer[i-s_paintedtime].right = 0;
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}
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}
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// paint in the channels.
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ch = s_channels;
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for ( i = 0; i < MAX_CHANNELS ; i++, ch++ ) {
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if ( !ch->thesfx || (!ch->leftvol && !ch->rightvol) ) {
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continue;
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}
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ltime = s_paintedtime;
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sfx = ch->thesfx;
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if (sfx->soundData==NULL || sfx->soundLength==0) {
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continue;
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}
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sampleOffset = ltime - ch->startSample;
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count = end - ltime;
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if ( sampleOffset + count > sfx->soundLength ) {
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count = sfx->soundLength - sampleOffset;
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}
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if ( count > 0 ) {
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S_PaintChannelFrom16( ch, sfx, count, sampleOffset, ltime - s_paintedtime );
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}
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}
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// paint in the looped channels.
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ch = loop_channels;
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for ( i = 0; i < numLoopChannels ; i++, ch++ ) {
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if ( !ch->thesfx || (!ch->leftvol && !ch->rightvol) ) {
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continue;
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}
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ltime = s_paintedtime;
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sfx = ch->thesfx;
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if (sfx->soundData==NULL || sfx->soundLength==0) {
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continue;
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}
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// we might have to make two passes if it
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// is a looping sound effect and the end of
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// the sample is hit
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do {
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sampleOffset = (ltime % sfx->soundLength);
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count = end - ltime;
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if ( sampleOffset + count > sfx->soundLength ) {
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count = sfx->soundLength - sampleOffset;
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}
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if ( count > 0 ) {
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S_PaintChannelFrom16( ch, sfx, count, sampleOffset, ltime - s_paintedtime );
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ltime += count;
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}
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} while ( ltime < end);
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}
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// transfer out according to DMA format
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S_TransferPaintBuffer( end );
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s_paintedtime = end;
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}
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}
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