451 lines
15 KiB
C
451 lines
15 KiB
C
/**
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* OpenAL cross platform audio library
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* Copyright (C) 1999-2010 by authors.
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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* Or go to http://www.gnu.org/copyleft/lgpl.html
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*/
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#include "config.h"
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#include <math.h>
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#include <stdlib.h>
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#include <string.h>
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#include <ctype.h>
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#include <assert.h>
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#include "alMain.h"
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#include "AL/al.h"
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#include "AL/alc.h"
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#include "alu.h"
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extern inline void SetGains(const ALCdevice *device, ALfloat ingain, ALfloat gains[MaxChannels]);
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static void SetSpeakerArrangement(const char *name, ALfloat SpeakerAngle[MaxChannels],
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enum Channel Speaker2Chan[MaxChannels], ALint chans)
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{
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char *confkey, *next;
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char *layout_str;
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char *sep, *end;
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enum Channel val;
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const char *str;
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int i;
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if(!ConfigValueStr(NULL, name, &str) && !ConfigValueStr(NULL, "layout", &str))
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return;
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layout_str = strdup(str);
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next = confkey = layout_str;
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while(next && *next)
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{
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confkey = next;
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next = strchr(confkey, ',');
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if(next)
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{
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*next = 0;
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do {
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next++;
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} while(isspace(*next) || *next == ',');
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}
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sep = strchr(confkey, '=');
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if(!sep || confkey == sep)
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{
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ERR("Malformed speaker key: %s\n", confkey);
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continue;
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}
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end = sep - 1;
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while(isspace(*end) && end != confkey)
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end--;
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*(++end) = 0;
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if(strcmp(confkey, "fl") == 0 || strcmp(confkey, "front-left") == 0)
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val = FrontLeft;
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else if(strcmp(confkey, "fr") == 0 || strcmp(confkey, "front-right") == 0)
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val = FrontRight;
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else if(strcmp(confkey, "fc") == 0 || strcmp(confkey, "front-center") == 0)
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val = FrontCenter;
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else if(strcmp(confkey, "bl") == 0 || strcmp(confkey, "back-left") == 0)
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val = BackLeft;
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else if(strcmp(confkey, "br") == 0 || strcmp(confkey, "back-right") == 0)
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val = BackRight;
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else if(strcmp(confkey, "bc") == 0 || strcmp(confkey, "back-center") == 0)
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val = BackCenter;
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else if(strcmp(confkey, "sl") == 0 || strcmp(confkey, "side-left") == 0)
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val = SideLeft;
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else if(strcmp(confkey, "sr") == 0 || strcmp(confkey, "side-right") == 0)
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val = SideRight;
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else
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{
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ERR("Unknown speaker for %s: \"%s\"\n", name, confkey);
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continue;
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}
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*(sep++) = 0;
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while(isspace(*sep))
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sep++;
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for(i = 0;i < chans;i++)
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{
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if(Speaker2Chan[i] == val)
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{
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long angle = strtol(sep, NULL, 10);
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if(angle >= -180 && angle <= 180)
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SpeakerAngle[i] = DEG2RAD(angle);
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else
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ERR("Invalid angle for speaker \"%s\": %ld\n", confkey, angle);
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break;
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}
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}
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}
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free(layout_str);
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layout_str = NULL;
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for(i = 0;i < chans;i++)
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{
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int min = i;
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int i2;
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for(i2 = i+1;i2 < chans;i2++)
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{
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if(SpeakerAngle[i2] < SpeakerAngle[min])
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min = i2;
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}
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if(min != i)
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{
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ALfloat tmpf;
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enum Channel tmpc;
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tmpf = SpeakerAngle[i];
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SpeakerAngle[i] = SpeakerAngle[min];
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SpeakerAngle[min] = tmpf;
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tmpc = Speaker2Chan[i];
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Speaker2Chan[i] = Speaker2Chan[min];
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Speaker2Chan[min] = tmpc;
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}
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}
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}
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void ComputeAngleGains(const ALCdevice *device, ALfloat angle, ALfloat hwidth, ALfloat ingain, ALfloat gains[MaxChannels])
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{
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ALfloat tmpgains[MaxChannels] = { 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f };
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enum Channel Speaker2Chan[MaxChannels];
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ALfloat SpeakerAngle[MaxChannels];
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ALfloat langle, rangle;
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ALfloat a;
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ALuint i;
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for(i = 0;i < device->NumChan;i++)
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Speaker2Chan[i] = device->Speaker2Chan[i];
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for(i = 0;i < device->NumChan;i++)
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SpeakerAngle[i] = device->SpeakerAngle[i];
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/* Some easy special-cases first... */
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if(device->NumChan <= 1 || hwidth >= F_PI)
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{
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/* Full coverage for all speakers. */
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for(i = 0;i < MaxChannels;i++)
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gains[i] = 0.0f;
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for(i = 0;i < device->NumChan;i++)
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{
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enum Channel chan = Speaker2Chan[i];
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gains[chan] = ingain;
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}
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return;
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}
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if(hwidth <= 0.0f)
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{
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/* Infinitely small sound point. */
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for(i = 0;i < MaxChannels;i++)
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gains[i] = 0.0f;
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for(i = 0;i < device->NumChan-1;i++)
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{
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if(angle >= SpeakerAngle[i] && angle < SpeakerAngle[i+1])
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{
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/* Sound is between speakers i and i+1 */
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a = (angle-SpeakerAngle[i]) /
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(SpeakerAngle[i+1]-SpeakerAngle[i]);
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gains[Speaker2Chan[i]] = sqrtf(1.0f-a) * ingain;
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gains[Speaker2Chan[i+1]] = sqrtf( a) * ingain;
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return;
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}
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}
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/* Sound is between last and first speakers */
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if(angle < SpeakerAngle[0])
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angle += F_2PI;
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a = (angle-SpeakerAngle[i]) /
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(F_2PI + SpeakerAngle[0]-SpeakerAngle[i]);
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gains[Speaker2Chan[i]] = sqrtf(1.0f-a) * ingain;
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gains[Speaker2Chan[0]] = sqrtf( a) * ingain;
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return;
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}
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if(fabsf(angle)+hwidth > F_PI)
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{
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/* The coverage area would go outside of -pi...+pi. Instead, rotate the
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* speaker angles so it would be as if angle=0, and keep them wrapped
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* within -pi...+pi. */
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if(angle > 0.0f)
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{
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ALuint done;
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ALuint i = 0;
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while(i < device->NumChan && device->SpeakerAngle[i]-angle < -F_PI)
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i++;
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for(done = 0;i < device->NumChan;done++)
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{
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SpeakerAngle[done] = device->SpeakerAngle[i]-angle;
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Speaker2Chan[done] = device->Speaker2Chan[i];
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i++;
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}
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for(i = 0;done < device->NumChan;i++)
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{
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SpeakerAngle[done] = device->SpeakerAngle[i]-angle + F_2PI;
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Speaker2Chan[done] = device->Speaker2Chan[i];
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done++;
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}
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}
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else
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{
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/* NOTE: '< device->NumChan' on the iterators is correct here since
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* we need to handle index 0. Because the iterators are unsigned,
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* they'll underflow and wrap to become 0xFFFFFFFF, which will
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* break as expected. */
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ALuint done;
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ALuint i = device->NumChan-1;
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while(i < device->NumChan && device->SpeakerAngle[i]-angle > F_PI)
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i--;
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for(done = device->NumChan-1;i < device->NumChan;done--)
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{
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SpeakerAngle[done] = device->SpeakerAngle[i]-angle;
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Speaker2Chan[done] = device->Speaker2Chan[i];
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i--;
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}
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for(i = device->NumChan-1;done < device->NumChan;i--)
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{
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SpeakerAngle[done] = device->SpeakerAngle[i]-angle - F_2PI;
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Speaker2Chan[done] = device->Speaker2Chan[i];
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done--;
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}
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}
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angle = 0.0f;
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}
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langle = angle - hwidth;
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rangle = angle + hwidth;
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/* First speaker */
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i = 0;
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do {
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ALuint last = device->NumChan-1;
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enum Channel chan = Speaker2Chan[i];
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if(SpeakerAngle[i] >= langle && SpeakerAngle[i] <= rangle)
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{
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tmpgains[chan] = 1.0f;
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continue;
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}
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if(SpeakerAngle[i] < langle && SpeakerAngle[i+1] > langle)
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{
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a = (langle-SpeakerAngle[i]) /
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(SpeakerAngle[i+1]-SpeakerAngle[i]);
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tmpgains[chan] = lerp(tmpgains[chan], 1.0f, 1.0f-a);
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}
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if(SpeakerAngle[i] > rangle)
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{
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a = (F_2PI + rangle-SpeakerAngle[last]) /
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(F_2PI + SpeakerAngle[i]-SpeakerAngle[last]);
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tmpgains[chan] = lerp(tmpgains[chan], 1.0f, a);
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}
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else if(SpeakerAngle[last] < rangle)
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{
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a = (rangle-SpeakerAngle[last]) /
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(F_2PI + SpeakerAngle[i]-SpeakerAngle[last]);
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tmpgains[chan] = lerp(tmpgains[chan], 1.0f, a);
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}
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} while(0);
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for(i = 1;i < device->NumChan-1;i++)
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{
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enum Channel chan = Speaker2Chan[i];
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if(SpeakerAngle[i] >= langle && SpeakerAngle[i] <= rangle)
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{
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tmpgains[chan] = 1.0f;
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continue;
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}
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if(SpeakerAngle[i] < langle && SpeakerAngle[i+1] > langle)
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{
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a = (langle-SpeakerAngle[i]) /
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(SpeakerAngle[i+1]-SpeakerAngle[i]);
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tmpgains[chan] = lerp(tmpgains[chan], 1.0f, 1.0f-a);
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}
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if(SpeakerAngle[i] > rangle && SpeakerAngle[i-1] < rangle)
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{
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a = (rangle-SpeakerAngle[i-1]) /
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(SpeakerAngle[i]-SpeakerAngle[i-1]);
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tmpgains[chan] = lerp(tmpgains[chan], 1.0f, a);
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}
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}
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/* Last speaker */
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i = device->NumChan-1;
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do {
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enum Channel chan = Speaker2Chan[i];
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if(SpeakerAngle[i] >= langle && SpeakerAngle[i] <= rangle)
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{
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tmpgains[Speaker2Chan[i]] = 1.0f;
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continue;
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}
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if(SpeakerAngle[i] > rangle && SpeakerAngle[i-1] < rangle)
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{
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a = (rangle-SpeakerAngle[i-1]) /
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(SpeakerAngle[i]-SpeakerAngle[i-1]);
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tmpgains[chan] = lerp(tmpgains[chan], 1.0f, a);
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}
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if(SpeakerAngle[i] < langle)
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{
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a = (langle-SpeakerAngle[i]) /
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(F_2PI + SpeakerAngle[0]-SpeakerAngle[i]);
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tmpgains[chan] = lerp(tmpgains[chan], 1.0f, 1.0f-a);
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}
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else if(SpeakerAngle[0] > langle)
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{
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a = (F_2PI + langle-SpeakerAngle[i]) /
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(F_2PI + SpeakerAngle[0]-SpeakerAngle[i]);
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tmpgains[chan] = lerp(tmpgains[chan], 1.0f, 1.0f-a);
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}
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} while(0);
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for(i = 0;i < device->NumChan;i++)
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{
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enum Channel chan = device->Speaker2Chan[i];
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gains[chan] = sqrtf(tmpgains[chan]) * ingain;
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}
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}
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ALvoid aluInitPanning(ALCdevice *Device)
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{
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const char *layoutname = NULL;
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enum Channel *Speaker2Chan;
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ALfloat *SpeakerAngle;
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Speaker2Chan = Device->Speaker2Chan;
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SpeakerAngle = Device->SpeakerAngle;
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switch(Device->FmtChans)
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{
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case DevFmtMono:
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Device->NumChan = 1;
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Speaker2Chan[0] = FrontCenter;
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SpeakerAngle[0] = DEG2RAD(0.0f);
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layoutname = NULL;
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break;
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case DevFmtStereo:
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Device->NumChan = 2;
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Speaker2Chan[0] = FrontLeft;
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Speaker2Chan[1] = FrontRight;
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SpeakerAngle[0] = DEG2RAD(-90.0f);
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SpeakerAngle[1] = DEG2RAD( 90.0f);
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layoutname = "layout_stereo";
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break;
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case DevFmtQuad:
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Device->NumChan = 4;
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Speaker2Chan[0] = BackLeft;
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Speaker2Chan[1] = FrontLeft;
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Speaker2Chan[2] = FrontRight;
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Speaker2Chan[3] = BackRight;
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SpeakerAngle[0] = DEG2RAD(-135.0f);
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SpeakerAngle[1] = DEG2RAD( -45.0f);
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SpeakerAngle[2] = DEG2RAD( 45.0f);
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SpeakerAngle[3] = DEG2RAD( 135.0f);
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layoutname = "layout_quad";
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break;
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case DevFmtX51:
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Device->NumChan = 5;
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Speaker2Chan[0] = BackLeft;
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Speaker2Chan[1] = FrontLeft;
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Speaker2Chan[2] = FrontCenter;
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Speaker2Chan[3] = FrontRight;
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Speaker2Chan[4] = BackRight;
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SpeakerAngle[0] = DEG2RAD(-110.0f);
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SpeakerAngle[1] = DEG2RAD( -30.0f);
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SpeakerAngle[2] = DEG2RAD( 0.0f);
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SpeakerAngle[3] = DEG2RAD( 30.0f);
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SpeakerAngle[4] = DEG2RAD( 110.0f);
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layoutname = "layout_surround51";
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break;
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case DevFmtX51Side:
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Device->NumChan = 5;
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Speaker2Chan[0] = SideLeft;
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Speaker2Chan[1] = FrontLeft;
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Speaker2Chan[2] = FrontCenter;
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Speaker2Chan[3] = FrontRight;
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Speaker2Chan[4] = SideRight;
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SpeakerAngle[0] = DEG2RAD(-90.0f);
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SpeakerAngle[1] = DEG2RAD(-30.0f);
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SpeakerAngle[2] = DEG2RAD( 0.0f);
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SpeakerAngle[3] = DEG2RAD( 30.0f);
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SpeakerAngle[4] = DEG2RAD( 90.0f);
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layoutname = "layout_side51";
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break;
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case DevFmtX61:
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Device->NumChan = 6;
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Speaker2Chan[0] = SideLeft;
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Speaker2Chan[1] = FrontLeft;
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Speaker2Chan[2] = FrontCenter;
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Speaker2Chan[3] = FrontRight;
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Speaker2Chan[4] = SideRight;
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Speaker2Chan[5] = BackCenter;
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SpeakerAngle[0] = DEG2RAD(-90.0f);
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SpeakerAngle[1] = DEG2RAD(-30.0f);
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SpeakerAngle[2] = DEG2RAD( 0.0f);
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SpeakerAngle[3] = DEG2RAD( 30.0f);
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SpeakerAngle[4] = DEG2RAD( 90.0f);
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SpeakerAngle[5] = DEG2RAD(180.0f);
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layoutname = "layout_surround61";
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break;
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case DevFmtX71:
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Device->NumChan = 7;
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Speaker2Chan[0] = BackLeft;
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Speaker2Chan[1] = SideLeft;
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Speaker2Chan[2] = FrontLeft;
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Speaker2Chan[3] = FrontCenter;
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Speaker2Chan[4] = FrontRight;
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Speaker2Chan[5] = SideRight;
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Speaker2Chan[6] = BackRight;
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SpeakerAngle[0] = DEG2RAD(-150.0f);
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SpeakerAngle[1] = DEG2RAD( -90.0f);
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SpeakerAngle[2] = DEG2RAD( -30.0f);
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SpeakerAngle[3] = DEG2RAD( 0.0f);
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SpeakerAngle[4] = DEG2RAD( 30.0f);
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SpeakerAngle[5] = DEG2RAD( 90.0f);
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SpeakerAngle[6] = DEG2RAD( 150.0f);
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layoutname = "layout_surround71";
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break;
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}
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if(layoutname && Device->Type != Loopback)
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SetSpeakerArrangement(layoutname, SpeakerAngle, Speaker2Chan, Device->NumChan);
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}
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