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-rw-r--r--Alc/panning.c361
1 files changed, 361 insertions, 0 deletions
diff --git a/Alc/panning.c b/Alc/panning.c
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+++ b/Alc/panning.c
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+/**
+ * OpenAL cross platform audio library
+ * Copyright (C) 1999-2010 by authors.
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ * Or go to http://www.gnu.org/copyleft/lgpl.html
+ */
+
+#include "config.h"
+
+#include <math.h>
+#include <stdlib.h>
+#include <string.h>
+#include <ctype.h>
+#include <assert.h>
+
+#include "alMain.h"
+#include "AL/al.h"
+#include "AL/alc.h"
+#include "alu.h"
+
+static void SetSpeakerArrangement(const char *name, ALfloat SpeakerAngle[OUTPUTCHANNELS],
+ Channel Speaker2Chan[OUTPUTCHANNELS], ALint chans)
+{
+ char layout_str[256];
+ char *confkey, *next;
+ char *sep, *end;
+ Channel val;
+ int i;
+
+ strncpy(layout_str, GetConfigValue(NULL, name, ""), sizeof(layout_str));
+ layout_str[sizeof(layout_str)-1] = 0;
+
+ if(!layout_str[0])
+ return;
+
+ next = confkey = layout_str;
+ while(next && *next)
+ {
+ confkey = next;
+ next = strchr(confkey, ',');
+ if(next)
+ {
+ *next = 0;
+ do {
+ next++;
+ } while(isspace(*next) || *next == ',');
+ }
+
+ sep = strchr(confkey, '=');
+ if(!sep || confkey == sep)
+ continue;
+
+ end = sep - 1;
+ while(isspace(*end) && end != confkey)
+ end--;
+ *(++end) = 0;
+
+ if(strcmp(confkey, "fl") == 0 || strcmp(confkey, "front-left") == 0)
+ val = FRONT_LEFT;
+ else if(strcmp(confkey, "fr") == 0 || strcmp(confkey, "front-right") == 0)
+ val = FRONT_RIGHT;
+ else if(strcmp(confkey, "fc") == 0 || strcmp(confkey, "front-center") == 0)
+ val = FRONT_CENTER;
+ else if(strcmp(confkey, "bl") == 0 || strcmp(confkey, "back-left") == 0)
+ val = BACK_LEFT;
+ else if(strcmp(confkey, "br") == 0 || strcmp(confkey, "back-right") == 0)
+ val = BACK_RIGHT;
+ else if(strcmp(confkey, "bc") == 0 || strcmp(confkey, "back-center") == 0)
+ val = BACK_CENTER;
+ else if(strcmp(confkey, "sl") == 0 || strcmp(confkey, "side-left") == 0)
+ val = SIDE_LEFT;
+ else if(strcmp(confkey, "sr") == 0 || strcmp(confkey, "side-right") == 0)
+ val = SIDE_RIGHT;
+ else
+ {
+ AL_PRINT("Unknown speaker for %s: \"%s\"\n", name, confkey);
+ continue;
+ }
+
+ *(sep++) = 0;
+ while(isspace(*sep))
+ sep++;
+
+ for(i = 0;i < chans;i++)
+ {
+ if(Speaker2Chan[i] == val)
+ {
+ long angle = strtol(sep, NULL, 10);
+ if(angle >= -180 && angle <= 180)
+ SpeakerAngle[i] = angle * M_PI/180.0f;
+ else
+ AL_PRINT("Invalid angle for speaker \"%s\": %ld\n", confkey, angle);
+ break;
+ }
+ }
+ }
+
+ for(i = 0;i < chans;i++)
+ {
+ int min = i;
+ int i2;
+
+ for(i2 = i+1;i2 < chans;i2++)
+ {
+ if(SpeakerAngle[i2] < SpeakerAngle[min])
+ min = i2;
+ }
+
+ if(min != i)
+ {
+ ALfloat tmpf;
+ Channel tmpc;
+
+ tmpf = SpeakerAngle[i];
+ SpeakerAngle[i] = SpeakerAngle[min];
+ SpeakerAngle[min] = tmpf;
+
+ tmpc = Speaker2Chan[i];
+ Speaker2Chan[i] = Speaker2Chan[min];
+ Speaker2Chan[min] = tmpc;
+ }
+ }
+}
+
+static ALfloat aluLUTpos2Angle(ALint pos)
+{
+ if(pos < QUADRANT_NUM)
+ return aluAtan((ALfloat)pos / (ALfloat)(QUADRANT_NUM - pos));
+ if(pos < 2 * QUADRANT_NUM)
+ return M_PI_2 + aluAtan((ALfloat)(pos - QUADRANT_NUM) / (ALfloat)(2 * QUADRANT_NUM - pos));
+ if(pos < 3 * QUADRANT_NUM)
+ return aluAtan((ALfloat)(pos - 2 * QUADRANT_NUM) / (ALfloat)(3 * QUADRANT_NUM - pos)) - M_PI;
+ return aluAtan((ALfloat)(pos - 3 * QUADRANT_NUM) / (ALfloat)(4 * QUADRANT_NUM - pos)) - M_PI_2;
+}
+
+ALvoid aluInitPanning(ALCdevice *Device)
+{
+ ALfloat SpeakerAngle[OUTPUTCHANNELS];
+ Channel *Speaker2Chan;
+ ALfloat Alpha, Theta;
+ ALint pos, offset;
+ ALuint s, s2;
+
+ for(s = 0;s < OUTPUTCHANNELS;s++)
+ {
+ for(s2 = 0;s2 < OUTPUTCHANNELS;s2++)
+ Device->ChannelMatrix[s][s2] = ((s==s2) ? 1.0f : 0.0f);
+ }
+
+ Speaker2Chan = Device->Speaker2Chan;
+ switch(Device->Format)
+ {
+ case AL_FORMAT_MONO8:
+ case AL_FORMAT_MONO16:
+ case AL_FORMAT_MONO_FLOAT32:
+ Device->DuplicateStereo = AL_FALSE;
+ Device->ChannelMatrix[FRONT_LEFT][FRONT_CENTER] = aluSqrt(0.5);
+ Device->ChannelMatrix[FRONT_RIGHT][FRONT_CENTER] = aluSqrt(0.5);
+ Device->ChannelMatrix[SIDE_LEFT][FRONT_CENTER] = aluSqrt(0.5);
+ Device->ChannelMatrix[SIDE_RIGHT][FRONT_CENTER] = aluSqrt(0.5);
+ Device->ChannelMatrix[BACK_LEFT][FRONT_CENTER] = aluSqrt(0.5);
+ Device->ChannelMatrix[BACK_RIGHT][FRONT_CENTER] = aluSqrt(0.5);
+ Device->ChannelMatrix[BACK_CENTER][FRONT_CENTER] = 1.0f;
+ Device->NumChan = 1;
+ Speaker2Chan[0] = FRONT_CENTER;
+ SpeakerAngle[0] = 0.0f * M_PI/180.0f;
+ break;
+
+ case AL_FORMAT_STEREO8:
+ case AL_FORMAT_STEREO16:
+ case AL_FORMAT_STEREO_FLOAT32:
+ Device->DuplicateStereo = AL_FALSE;
+ Device->ChannelMatrix[FRONT_CENTER][FRONT_LEFT] = aluSqrt(0.5);
+ Device->ChannelMatrix[FRONT_CENTER][FRONT_RIGHT] = aluSqrt(0.5);
+ Device->ChannelMatrix[SIDE_LEFT][FRONT_LEFT] = 1.0f;
+ Device->ChannelMatrix[SIDE_RIGHT][FRONT_RIGHT] = 1.0f;
+ Device->ChannelMatrix[BACK_LEFT][FRONT_LEFT] = 1.0f;
+ Device->ChannelMatrix[BACK_RIGHT][FRONT_RIGHT] = 1.0f;
+ Device->ChannelMatrix[BACK_CENTER][FRONT_LEFT] = aluSqrt(0.5);
+ Device->ChannelMatrix[BACK_CENTER][FRONT_RIGHT] = aluSqrt(0.5);
+ Device->NumChan = 2;
+ Speaker2Chan[0] = FRONT_LEFT;
+ Speaker2Chan[1] = FRONT_RIGHT;
+ SpeakerAngle[0] = -90.0f * M_PI/180.0f;
+ SpeakerAngle[1] = 90.0f * M_PI/180.0f;
+ SetSpeakerArrangement("layout", SpeakerAngle, Speaker2Chan, Device->NumChan);
+ break;
+
+ case AL_FORMAT_QUAD8:
+ case AL_FORMAT_QUAD16:
+ case AL_FORMAT_QUAD32:
+ Device->DuplicateStereo = GetConfigValueBool(NULL, "stereodup", 0);
+ Device->ChannelMatrix[FRONT_CENTER][FRONT_LEFT] = aluSqrt(0.5);
+ Device->ChannelMatrix[FRONT_CENTER][FRONT_RIGHT] = aluSqrt(0.5);
+ Device->ChannelMatrix[SIDE_LEFT][FRONT_LEFT] = aluSqrt(0.5);
+ Device->ChannelMatrix[SIDE_LEFT][BACK_LEFT] = aluSqrt(0.5);
+ Device->ChannelMatrix[SIDE_RIGHT][FRONT_RIGHT] = aluSqrt(0.5);
+ Device->ChannelMatrix[SIDE_RIGHT][BACK_RIGHT] = aluSqrt(0.5);
+ Device->ChannelMatrix[BACK_CENTER][BACK_LEFT] = aluSqrt(0.5);
+ Device->ChannelMatrix[BACK_CENTER][BACK_RIGHT] = aluSqrt(0.5);
+ Device->NumChan = 4;
+ Speaker2Chan[0] = BACK_LEFT;
+ Speaker2Chan[1] = FRONT_LEFT;
+ Speaker2Chan[2] = FRONT_RIGHT;
+ Speaker2Chan[3] = BACK_RIGHT;
+ SpeakerAngle[0] = -135.0f * M_PI/180.0f;
+ SpeakerAngle[1] = -45.0f * M_PI/180.0f;
+ SpeakerAngle[2] = 45.0f * M_PI/180.0f;
+ SpeakerAngle[3] = 135.0f * M_PI/180.0f;
+ SetSpeakerArrangement("layout", SpeakerAngle, Speaker2Chan, Device->NumChan);
+ break;
+
+ case AL_FORMAT_51CHN8:
+ case AL_FORMAT_51CHN16:
+ case AL_FORMAT_51CHN32:
+ Device->DuplicateStereo = GetConfigValueBool(NULL, "stereodup", 0);
+ Device->ChannelMatrix[SIDE_LEFT][FRONT_LEFT] = aluSqrt(0.5);
+ Device->ChannelMatrix[SIDE_LEFT][BACK_LEFT] = aluSqrt(0.5);
+ Device->ChannelMatrix[SIDE_RIGHT][FRONT_RIGHT] = aluSqrt(0.5);
+ Device->ChannelMatrix[SIDE_RIGHT][BACK_RIGHT] = aluSqrt(0.5);
+ Device->ChannelMatrix[BACK_CENTER][BACK_LEFT] = aluSqrt(0.5);
+ Device->ChannelMatrix[BACK_CENTER][BACK_RIGHT] = aluSqrt(0.5);
+ Device->NumChan = 5;
+ Speaker2Chan[0] = BACK_LEFT;
+ Speaker2Chan[1] = FRONT_LEFT;
+ Speaker2Chan[2] = FRONT_CENTER;
+ Speaker2Chan[3] = FRONT_RIGHT;
+ Speaker2Chan[4] = BACK_RIGHT;
+ SpeakerAngle[0] = -110.0f * M_PI/180.0f;
+ SpeakerAngle[1] = -30.0f * M_PI/180.0f;
+ SpeakerAngle[2] = 0.0f * M_PI/180.0f;
+ SpeakerAngle[3] = 30.0f * M_PI/180.0f;
+ SpeakerAngle[4] = 110.0f * M_PI/180.0f;
+ SetSpeakerArrangement("layout", SpeakerAngle, Speaker2Chan, Device->NumChan);
+ break;
+
+ case AL_FORMAT_61CHN8:
+ case AL_FORMAT_61CHN16:
+ case AL_FORMAT_61CHN32:
+ Device->DuplicateStereo = GetConfigValueBool(NULL, "stereodup", 0);
+ Device->ChannelMatrix[BACK_LEFT][BACK_CENTER] = aluSqrt(0.5);
+ Device->ChannelMatrix[BACK_LEFT][SIDE_LEFT] = aluSqrt(0.5);
+ Device->ChannelMatrix[BACK_RIGHT][BACK_CENTER] = aluSqrt(0.5);
+ Device->ChannelMatrix[BACK_RIGHT][SIDE_RIGHT] = aluSqrt(0.5);
+ Device->NumChan = 6;
+ Speaker2Chan[0] = SIDE_LEFT;
+ Speaker2Chan[1] = FRONT_LEFT;
+ Speaker2Chan[2] = FRONT_CENTER;
+ Speaker2Chan[3] = FRONT_RIGHT;
+ Speaker2Chan[4] = SIDE_RIGHT;
+ Speaker2Chan[5] = BACK_CENTER;
+ SpeakerAngle[0] = -90.0f * M_PI/180.0f;
+ SpeakerAngle[1] = -30.0f * M_PI/180.0f;
+ SpeakerAngle[2] = 0.0f * M_PI/180.0f;
+ SpeakerAngle[3] = 30.0f * M_PI/180.0f;
+ SpeakerAngle[4] = 90.0f * M_PI/180.0f;
+ SpeakerAngle[5] = 180.0f * M_PI/180.0f;
+ SetSpeakerArrangement("layout", SpeakerAngle, Speaker2Chan, Device->NumChan);
+ break;
+
+ case AL_FORMAT_71CHN8:
+ case AL_FORMAT_71CHN16:
+ case AL_FORMAT_71CHN32:
+ Device->DuplicateStereo = GetConfigValueBool(NULL, "stereodup", 0);
+ Device->ChannelMatrix[BACK_CENTER][BACK_LEFT] = aluSqrt(0.5);
+ Device->ChannelMatrix[BACK_CENTER][BACK_RIGHT] = aluSqrt(0.5);
+ Device->NumChan = 7;
+ Speaker2Chan[0] = BACK_LEFT;
+ Speaker2Chan[1] = SIDE_LEFT;
+ Speaker2Chan[2] = FRONT_LEFT;
+ Speaker2Chan[3] = FRONT_CENTER;
+ Speaker2Chan[4] = FRONT_RIGHT;
+ Speaker2Chan[5] = SIDE_RIGHT;
+ Speaker2Chan[6] = BACK_RIGHT;
+ SpeakerAngle[0] = -150.0f * M_PI/180.0f;
+ SpeakerAngle[1] = -90.0f * M_PI/180.0f;
+ SpeakerAngle[2] = -30.0f * M_PI/180.0f;
+ SpeakerAngle[3] = 0.0f * M_PI/180.0f;
+ SpeakerAngle[4] = 30.0f * M_PI/180.0f;
+ SpeakerAngle[5] = 90.0f * M_PI/180.0f;
+ SpeakerAngle[6] = 150.0f * M_PI/180.0f;
+ SetSpeakerArrangement("layout", SpeakerAngle, Speaker2Chan, Device->NumChan);
+ break;
+
+ default:
+ assert(0);
+ }
+
+ if(GetConfigValueBool(NULL, "scalemix", 0))
+ {
+ ALfloat maxout = 1.0f;
+ for(s = 0;s < OUTPUTCHANNELS;s++)
+ {
+ ALfloat out = 0.0f;
+ for(s2 = 0;s2 < OUTPUTCHANNELS;s2++)
+ out += Device->ChannelMatrix[s2][s];
+ maxout = __max(maxout, out);
+ }
+
+ maxout = 1.0f/maxout;
+ for(s = 0;s < OUTPUTCHANNELS;s++)
+ {
+ for(s2 = 0;s2 < OUTPUTCHANNELS;s2++)
+ Device->ChannelMatrix[s2][s] *= maxout;
+ }
+ }
+
+ for(pos = 0; pos < LUT_NUM; pos++)
+ {
+ /* clear all values */
+ offset = OUTPUTCHANNELS * pos;
+ for(s = 0; s < OUTPUTCHANNELS; s++)
+ Device->PanningLUT[offset+s] = 0.0f;
+
+ if(Device->NumChan == 1)
+ {
+ Device->PanningLUT[offset + Speaker2Chan[0]] = 1.0f;
+ continue;
+ }
+
+ /* source angle */
+ Theta = aluLUTpos2Angle(pos);
+
+ /* set panning values */
+ for(s = 0; s < Device->NumChan - 1; s++)
+ {
+ if(Theta >= SpeakerAngle[s] && Theta < SpeakerAngle[s+1])
+ {
+ /* source between speaker s and speaker s+1 */
+ Alpha = M_PI_2 * (Theta-SpeakerAngle[s]) /
+ (SpeakerAngle[s+1]-SpeakerAngle[s]);
+ Device->PanningLUT[offset + Speaker2Chan[s]] = cos(Alpha);
+ Device->PanningLUT[offset + Speaker2Chan[s+1]] = sin(Alpha);
+ break;
+ }
+ }
+ if(s == Device->NumChan - 1)
+ {
+ /* source between last and first speaker */
+ if(Theta < SpeakerAngle[0])
+ Theta += 2.0f * M_PI;
+ Alpha = M_PI_2 * (Theta-SpeakerAngle[s]) /
+ (2.0f * M_PI + SpeakerAngle[0]-SpeakerAngle[s]);
+ Device->PanningLUT[offset + Speaker2Chan[s]] = cos(Alpha);
+ Device->PanningLUT[offset + Speaker2Chan[0]] = sin(Alpha);
+ }
+ }
+}
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