From 15318cad33835e4e2dc620d033e43cd930676cdd Mon Sep 17 00:00:00 2001
From: kergoth <kergoth>
Date: Fri, 25 Jan 2002 22:14:26 +0000
Subject: Initial revision

---
(limited to 'core/multimedia/opieplayer/libmpeg3/audio/synthesizers.c')

diff --git a/core/multimedia/opieplayer/libmpeg3/audio/synthesizers.c b/core/multimedia/opieplayer/libmpeg3/audio/synthesizers.c
new file mode 100644
index 0000000..71a74b3
--- a/dev/null
+++ b/core/multimedia/opieplayer/libmpeg3/audio/synthesizers.c
@@ -0,0 +1,174 @@
+#include "mpeg3audio.h"
+#include "../libmpeg3.h"
+#include "../mpeg3protos.h"
+#include "tables.h"
+
+#define WRITE_SAMPLE(samples, sum) \
+{ \
+	(*samples) = (sum); \
+}
+
+int mpeg3audio_synth_stereo(mpeg3audio_t *audio, mpeg3_real_t *bandPtr, int channel, mpeg3_real_t *out, int *pnt)
+{
+	const int step = 2;
+	mpeg3_real_t *samples = out + *pnt;
+    register mpeg3_real_t sum;
+	mpeg3_real_t *b0, (*buf)[0x110];
+	int bo1;
+
+	if(!channel)
+	{
+    	audio->bo--;
+    	audio->bo &= 0xf;
+    	buf = audio->synth_stereo_buffs[0];
+	}
+	else 
+	{
+    	samples++;
+    	buf = audio->synth_stereo_buffs[1];
+	}
+
+	if(audio->bo & 0x1)
+	{
+    	b0 = buf[0];
+    	bo1 = audio->bo;
+    	mpeg3audio_dct64(buf[1] + ((audio->bo + 1) & 0xf), buf[0] + audio->bo, bandPtr);
+	}
+	else 
+	{
+    	b0 = buf[1];
+    	bo1 = audio->bo + 1;
+    	mpeg3audio_dct64(buf[0] + audio->bo, buf[1] + audio->bo + 1, bandPtr);
+	}
+
+/*printf("%f %f %f\n", buf[0][0], buf[1][0], bandPtr[0]); */
+
+	{
+    	register int j;
+    	mpeg3_real_t *window = mpeg3_decwin + 16 - bo1;
+
+    	for(j = 16; j; j--, b0 += 0x10, window += 0x20, samples += step)
+    	{
+    		sum  = window[0x0] * b0[0x0];
+    		sum -= window[0x1] * b0[0x1];
+    		sum += window[0x2] * b0[0x2];
+    		sum -= window[0x3] * b0[0x3];
+    		sum += window[0x4] * b0[0x4];
+    		sum -= window[0x5] * b0[0x5];
+    		sum += window[0x6] * b0[0x6];
+    		sum -= window[0x7] * b0[0x7];
+    		sum += window[0x8] * b0[0x8];
+    		sum -= window[0x9] * b0[0x9];
+    		sum += window[0xA] * b0[0xA];
+    		sum -= window[0xB] * b0[0xB];
+    		sum += window[0xC] * b0[0xC];
+    		sum -= window[0xD] * b0[0xD];
+    		sum += window[0xE] * b0[0xE];
+    		sum -= window[0xF] * b0[0xF];
+
+    		WRITE_SAMPLE(samples, sum);
+      	}
+
+    	sum  = window[0x0] * b0[0x0];
+    	sum += window[0x2] * b0[0x2];
+    	sum += window[0x4] * b0[0x4];
+    	sum += window[0x6] * b0[0x6];
+    	sum += window[0x8] * b0[0x8];
+    	sum += window[0xA] * b0[0xA];
+    	sum += window[0xC] * b0[0xC];
+    	sum += window[0xE] * b0[0xE];
+    	WRITE_SAMPLE(samples, sum);
+    	b0 -= 0x10;
+		window -= 0x20;
+		samples += step;
+      	window += bo1 << 1;
+
+    	for(j = 15; j; j--, b0 -= 0x10, window -= 0x20, samples += step)
+    	{
+    		sum = -window[-0x1] * b0[0x0];
+    		sum -= window[-0x2] * b0[0x1];
+    		sum -= window[-0x3] * b0[0x2];
+    		sum -= window[-0x4] * b0[0x3];
+    		sum -= window[-0x5] * b0[0x4];
+    		sum -= window[-0x6] * b0[0x5];
+    		sum -= window[-0x7] * b0[0x6];
+    		sum -= window[-0x8] * b0[0x7];
+    		sum -= window[-0x9] * b0[0x8];
+    		sum -= window[-0xA] * b0[0x9];
+    		sum -= window[-0xB] * b0[0xA];
+    		sum -= window[-0xC] * b0[0xB];
+    		sum -= window[-0xD] * b0[0xC];
+    		sum -= window[-0xE] * b0[0xD];
+    		sum -= window[-0xF] * b0[0xE];
+    		sum -= window[-0x0] * b0[0xF];
+
+    		WRITE_SAMPLE(samples, sum);
+    	}
+	}
+	*pnt += 64;
+
+	return 0;
+}
+
+int mpeg3audio_synth_mono(mpeg3audio_t *audio, mpeg3_real_t *bandPtr, mpeg3_real_t *samples, int *pnt)
+{
+	mpeg3_real_t *samples_tmp = audio->synth_mono_buff;
+	mpeg3_real_t *tmp1 = samples_tmp;
+	int i, ret;
+	int pnt1 = 0;
+
+	ret = mpeg3audio_synth_stereo(audio, bandPtr, 0, samples_tmp, &pnt1);
+	samples += *pnt;
+
+	for(i = 0; i < 32; i++)
+	{
+    	*samples = *tmp1;
+    	samples++;
+    	tmp1 += 2;
+	}
+	*pnt += 32;
+
+	return ret;
+}
+
+
+/* Call this after every seek to reset the buffers */
+int mpeg3audio_reset_synths(mpeg3audio_t *audio)
+{
+	int i, j, k;
+	for(i = 0; i < 2; i++)
+	{
+		for(j = 0; j < 2; j++)
+		{
+			for(k = 0; k < 0x110; k++)
+			{
+				audio->synth_stereo_buffs[i][j][k] = 0;
+			}
+		}
+	}
+	for(i = 0; i < 64; i++)
+	{
+		audio->synth_mono_buff[i] = 0;
+		audio->layer2_scfsi_buf[i] = 0;
+	}
+	for(i = 0; i < 2; i++)
+	{
+		for(j = 0; j < 2; j++)
+		{
+			for(k = 0; k < SBLIMIT * SSLIMIT; k++)
+			{
+				audio->mp3_block[i][j][k] = 0;
+			}
+		}
+	}
+	audio->mp3_blc[0] = 0;
+	audio->mp3_blc[1] = 0;
+	for(i = 0; i < audio->channels; i++)
+	{
+		for(j = 0; j < AC3_N / 2; j++)
+		{
+			audio->ac3_delay[i][j] = 0;
+		}
+	}
+	return 0;
+}
--
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