From bd80de8ab66caaaf4feb012e472ba32339d65312 Mon Sep 17 00:00:00 2001
From: arpi <arpi@b3059339-0415-0410-9bf9-f77b7e298cf2>
Date: Sun, 9 Dec 2001 19:23:15 +0000
Subject: resample.c added - float->int conversion and channel ordering

git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@3413 b3059339-0415-0410-9bf9-f77b7e298cf2
---
 liba52/resample_c.c | 125 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 125 insertions(+)
 create mode 100644 liba52/resample_c.c

(limited to 'liba52/resample_c.c')

diff --git a/liba52/resample_c.c b/liba52/resample_c.c
new file mode 100644
index 0000000000..61d12aa0cf
--- /dev/null
+++ b/liba52/resample_c.c
@@ -0,0 +1,125 @@
+// this code come from a52dec/libao/audio_out_oss.c
+
+// FIXME FIXME FIXME
+
+// a52_resample_init should find the requested converter (from type flags ->
+// given number of channels) and set up some function pointers...
+
+// a52_resample() should do the conversion.
+
+#include <inttypes.h>
+#include "a52.h"
+
+static inline int16_t convert (int32_t i)
+{
+    if (i > 0x43c07fff)
+	return 32767;
+    else if (i < 0x43bf8000)
+	return -32768;
+    else
+	return i - 0x43c00000;
+}
+
+static int chans=2;
+static int flags=0;
+
+void a52_resample_init(int _flags,int _chans){
+    chans=_chans;
+    flags=_flags;
+}
+
+int a52_resample(float * _f, int16_t * s16)
+{
+    int i;
+    int32_t * f = (int32_t *) _f;
+
+    switch (flags) {
+    case A52_MONO:
+	for (i = 0; i < 256; i++) {
+	    s16[5*i] = s16[5*i+1] = s16[5*i+2] = s16[5*i+3] = 0;
+	    s16[5*i+4] = convert (f[i]);
+	}
+	break;
+    case A52_CHANNEL:
+    case A52_STEREO:
+    case A52_DOLBY:
+	for (i = 0; i < 256; i++) {
+	    s16[2*i] = convert (f[i]);
+	    s16[2*i+1] = convert (f[i+256]);
+	}
+	break;
+    case A52_3F:
+	for (i = 0; i < 256; i++) {
+	    s16[5*i] = convert (f[i]);
+	    s16[5*i+1] = convert (f[i+512]);
+	    s16[5*i+2] = s16[5*i+3] = 0;
+	    s16[5*i+4] = convert (f[i+256]);
+	}
+	break;
+    case A52_2F2R:
+	for (i = 0; i < 256; i++) {
+	    s16[4*i] = convert (f[i]);
+	    s16[4*i+1] = convert (f[i+256]);
+	    s16[4*i+2] = convert (f[i+512]);
+	    s16[4*i+3] = convert (f[i+768]);
+	}
+	break;
+    case A52_3F2R:
+	for (i = 0; i < 256; i++) {
+	    s16[5*i] = convert (f[i]);
+	    s16[5*i+1] = convert (f[i+512]);
+	    s16[5*i+2] = convert (f[i+768]);
+	    s16[5*i+3] = convert (f[i+1024]);
+	    s16[5*i+4] = convert (f[i+256]);
+	}
+	break;
+    case A52_MONO | A52_LFE:
+	for (i = 0; i < 256; i++) {
+	    s16[6*i] = s16[6*i+1] = s16[6*i+2] = s16[6*i+3] = 0;
+	    s16[6*i+4] = convert (f[i+256]);
+	    s16[6*i+5] = convert (f[i]);
+	}
+	break;
+    case A52_CHANNEL | A52_LFE:
+    case A52_STEREO | A52_LFE:
+    case A52_DOLBY | A52_LFE:
+	for (i = 0; i < 256; i++) {
+	    s16[6*i] = convert (f[i+256]);
+	    s16[6*i+1] = convert (f[i+512]);
+	    s16[6*i+2] = s16[6*i+3] = s16[6*i+4] = 0;
+	    s16[6*i+5] = convert (f[i]);
+	}
+	break;
+    case A52_3F | A52_LFE:
+	for (i = 0; i < 256; i++) {
+	    s16[6*i] = convert (f[i+256]);
+	    s16[6*i+1] = convert (f[i+768]);
+	    s16[6*i+2] = s16[6*i+3] = 0;
+	    s16[6*i+4] = convert (f[i+512]);
+	    s16[6*i+5] = convert (f[i]);
+	}
+	break;
+    case A52_2F2R | A52_LFE:
+	for (i = 0; i < 256; i++) {
+	    s16[6*i] = convert (f[i+256]);
+	    s16[6*i+1] = convert (f[i+512]);
+	    s16[6*i+2] = convert (f[i+768]);
+	    s16[6*i+3] = convert (f[i+1024]);
+	    s16[6*i+4] = 0;
+	    s16[6*i+5] = convert (f[i]);
+	}
+	break;
+    case A52_3F2R | A52_LFE:
+	for (i = 0; i < 256; i++) {
+	    s16[6*i] = convert (f[i+256]);
+	    s16[6*i+1] = convert (f[i+768]);
+	    s16[6*i+2] = convert (f[i+1024]);
+	    s16[6*i+3] = convert (f[i+1280]);
+	    s16[6*i+4] = convert (f[i+512]);
+	    s16[6*i+5] = convert (f[i]);
+	}
+	break;
+    }
+    return chans*256;
+}
+
-- 
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