Migrate some floating point code to fixed point in libgme.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@30493 a1c6a512-1295-4272-9138-f99709370657

5 files changed, 14 insertions, 15 deletions

diff --git a/apps/codecs/libgme/emu8950.c b/apps/codecs/libgme/emu8950.c
index e75bf66..2f8a320 100644
--- a/apps/codecs/libgme/emu8950.c
+++ b/apps/codecs/libgme/emu8950.c
@@ -494,8 +494,8 @@ void OPL_setSampleRate(struct Y8950* this, int sampleRate, int clockRate)
 	makeDphaseARTable(sampleRate, clockRate);
 	makeDphaseDRTable(sampleRate, clockRate);
 	makeDphaseNoiseTable(sampleRate, clockRate);
-	this->pm_dphase = rate_adjust(PM_SPEED * PM_DP_WIDTH / (clockRate/72), sampleRate, clockRate);
-	this->am_dphase = rate_adjust(AM_SPEED * AM_DP_WIDTH / (clockRate/72), sampleRate, clockRate);
+	this->pm_dphase = rate_adjust( (int)(PM_SPEED * PM_DP_WIDTH) / (clockRate/72), sampleRate, clockRate);
+	this->am_dphase = rate_adjust( (int)(AM_SPEED * AM_DP_WIDTH) / (clockRate/72), sampleRate, clockRate);
 }
 
 // Reset whole of opl except patch datas.
diff --git a/apps/codecs/libgme/emu8950.h b/apps/codecs/libgme/emu8950.h
index 88d17b9..0216905 100644
--- a/apps/codecs/libgme/emu8950.h
+++ b/apps/codecs/libgme/emu8950.h
@@ -238,11 +238,11 @@ void OPL_changeStatusMask(struct Y8950* this_, byte newMask);
 
 
 // Adjust envelope speed which depends on sampling rate
-static inline unsigned int rate_adjust(double x, int rate, int clk)
+static inline unsigned int rate_adjust(int x, int rate, int clk)
 {
-	double tmp = x * clk / 72 / rate + 0.5; // +0.5 to round
+	unsigned int tmp = (long long)x * clk / 72 / rate;
 //	assert (tmp <= 4294967295U);
-	return (unsigned int)tmp;
+	return tmp;
 }
 
 #endif
diff --git a/apps/codecs/libgme/emuadpcm.c b/apps/codecs/libgme/emuadpcm.c
index d85aba3..b426a74 100644
--- a/apps/codecs/libgme/emuadpcm.c
+++ b/apps/codecs/libgme/emuadpcm.c
@@ -117,7 +117,7 @@ void restart(struct Y8950Adpcm* this_)
 	this_->diff = DDEF;
 	this_->nextLeveling = 0;
 	this_->sampleStep = 0;
-	this_->volumeWStep = (int)((double)this_->volume * this_->step / MAX_STEP);
+	this_->volumeWStep = (int)((long long)this_->volume * this_->step / MAX_STEP);
 }
 
 void ADPCM_writeReg(struct Y8950Adpcm* this_, byte rg, byte data)
@@ -176,23 +176,22 @@ void ADPCM_writeReg(struct Y8950Adpcm* this_, byte rg, byte data)
 		case 0x10: // DELTA-N (L) 
 			this_->delta = (this_->delta & 0xFF00) | data;
 			this_->step = rate_adjust(this_->delta<<GETA_BITS, this_->sampleRate, this_->clockRate);
-			this_->volumeWStep = (int)((double)this_->volume * this_->step / MAX_STEP);
+			this_->volumeWStep = (int)((long long)this_->volume * this_->step / MAX_STEP);
 			break;
 		case 0x11: // DELTA-N (H) 
 			this_->delta = (this_->delta & 0x00FF) | (data << 8);
 			this_->step = rate_adjust(this_->delta<<GETA_BITS, this_->sampleRate, this_->clockRate);
-			this_->volumeWStep = (int)((double)this_->volume * this_->step / MAX_STEP);
+			this_->volumeWStep = (int)((long long)this_->volume * this_->step / MAX_STEP);
 			break;
 
 		case 0x12: { // ENVELOP CONTROL 
 			int oldVol = this_->volume;
 			this_->volume = (data * ADPCM_VOLUME) >> 8;
 			if (oldVol != 0) {
-				double factor = (double)this_->volume / (double)oldVol;
-				this_->output =     (int)((double)this_->output     * factor);
-				this_->sampleStep = (int)((double)this_->sampleStep * factor);
+				this_->output =     (int)(((long long)this_->output     * this_->volume) / oldVol);
+				this_->sampleStep = (int)(((long long)this_->sampleStep * this_->volume) / oldVol);
 			}
-			this_->volumeWStep = (int)((double)this_->volume * this_->step / MAX_STEP);
+			this_->volumeWStep = (int)((long long)this_->volume * this_->step / MAX_STEP);
 			break;
 		}
 		case 0x0D: // PRESCALE (L) 
@@ -290,7 +289,7 @@ int ADPCM_calcSample(struct Y8950Adpcm* this_)
 		
 		/* TODO: Used fixed point math here */
 	#if !defined(ROCKBOX)
-		this_->output += (int)((double)this_->sampleStep * ((double)this_->nowStep/(double)this_->step));
+		this_->output += (int)(((long long)this_->sampleStep * this_->nowStep) / this_->step);
 	#endif
 	}
 	this_->output += this_->sampleStep;
diff --git a/apps/codecs/nsf.c b/apps/codecs/nsf.c
index 7214b5d2..4c5b37c 100644
--- a/apps/codecs/nsf.c
+++ b/apps/codecs/nsf.c
@@ -126,7 +126,7 @@ next_track:
 
         /* Set elapsed time for one track files */
         if (is_multitrack == 0) {
-            elapsed_time += (CHUNK_SIZE / 2) / 44.1;
+            elapsed_time += (CHUNK_SIZE / 2) * 10 / 441;
             ci->set_elapsed(elapsed_time);
         }
     }
diff --git a/apps/codecs/vgm.c b/apps/codecs/vgm.c
index d739029..416f772 100644
--- a/apps/codecs/vgm.c
+++ b/apps/codecs/vgm.c
@@ -134,7 +134,7 @@ enum codec_status codec_run(void)
 
         ci->pcmbuf_insert(samples, NULL, CHUNK_SIZE >> 1);
 
-        elapsed_time += (CHUNK_SIZE / 2) / 44.1;
+        elapsed_time += (CHUNK_SIZE / 2) * 10 / 441;
         ci->set_elapsed(elapsed_time);
     }