git-svn-id: http://webrtc.googlecode.com/svn/trunk@4 4adac7df-926f-26a2-2b94-8c16560cd09d

modules/audio_coding/codecs/PCM16B/main/source/pcm16b.c

@@ -0,0 +1,100 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+
+#include "pcm16b.h"
+
+#include "typedefs.h"
+
+#ifdef WEBRTC_BIG_ENDIAN
+#include "signal_processing_library.h"
+#endif
+
+#define HIGHEND 0xFF00
+#define LOWEND    0xFF
+
+
+
+/* Encoder with WebRtc_Word16 Output */
+WebRtc_Word16 WebRtcPcm16b_EncodeW16(WebRtc_Word16 *speechIn16b,
+                                     WebRtc_Word16 len,
+                                     WebRtc_Word16 *speechOut16b)
+{
+#ifdef WEBRTC_BIG_ENDIAN
+    WEBRTC_SPL_MEMCPY_W16(speechOut16b, speechIn16b, len);
+#else
+    int i;
+    for (i=0;i<len;i++) {
+        speechOut16b[i]=(((WebRtc_UWord16)speechIn16b[i])>>8)|((((WebRtc_UWord16)speechIn16b[i])<<8)&0xFF00);
+    }
+#endif
+    return(len<<1);
+}
+
+
+/* Encoder with char Output (old version) */
+WebRtc_Word16 WebRtcPcm16b_Encode(WebRtc_Word16 *speech16b,
+                                  WebRtc_Word16 len,
+                                  unsigned char *speech8b)
+{
+    WebRtc_Word16 samples=len*2;
+    WebRtc_Word16 pos;
+    WebRtc_Word16 short1;
+    WebRtc_Word16 short2;
+    for (pos=0;pos<len;pos++) {
+        short1=HIGHEND & speech16b[pos];
+        short2=LOWEND & speech16b[pos];
+        short1=short1>>8;
+        speech8b[pos*2]=(unsigned char) short1;
+        speech8b[pos*2+1]=(unsigned char) short2;
+    }
+    return(samples);
+}
+
+
+/* Decoder with WebRtc_Word16 Input instead of char when the WebRtc_Word16 Encoder is used */
+WebRtc_Word16 WebRtcPcm16b_DecodeW16(void *inst,
+                                     WebRtc_Word16 *speechIn16b,
+                                     WebRtc_Word16 len,
+                                     WebRtc_Word16 *speechOut16b,
+                                     WebRtc_Word16* speechType)
+{
+#ifdef WEBRTC_BIG_ENDIAN
+    WEBRTC_SPL_MEMCPY_W8(speechOut16b, speechIn16b, ((len*sizeof(WebRtc_Word16)+1)>>1));
+#else
+    int i;
+    int samples=len>>1;
+
+    for (i=0;i<samples;i++) {
+        speechOut16b[i]=(((WebRtc_UWord16)speechIn16b[i])>>8)|(((WebRtc_UWord16)(speechIn16b[i]&0xFF))<<8);
+    }
+#endif
+
+    *speechType=1;
+    return(len>>1);
+}
+
+/* "old" version of the decoder that uses char as input (not used in NetEq any more) */
+WebRtc_Word16 WebRtcPcm16b_Decode(unsigned char *speech8b,
+                                  WebRtc_Word16 len,
+                                  WebRtc_Word16 *speech16b)
+{
+    WebRtc_Word16 samples=len>>1;
+    WebRtc_Word16 pos;
+    WebRtc_Word16 shortval;
+    for (pos=0;pos<samples;pos++) {
+        shortval=((unsigned short) speech8b[pos*2]);
+        shortval=(shortval<<8)&HIGHEND;
+        shortval=shortval|(((unsigned short) speech8b[pos*2+1])&LOWEND);
+        speech16b[pos]=shortval;
+    }
+    return(samples);
+}
+

modules/audio_coding/codecs/PCM16B/main/source/pcm16b.gyp

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+# Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+#
+# Use of this source code is governed by a BSD-style license
+# that can be found in the LICENSE file in the root of the source
+# tree. An additional intellectual property rights grant can be found
+# in the file PATENTS.  All contributing project authors may
+# be found in the AUTHORS file in the root of the source tree.
+
+{
+  'includes': [
+    '../../../../../../common_settings.gypi', # Common settings
+  ],
+  'targets': [
+    {
+      'target_name': 'PCM16B',
+      'type': '<(library)',
+      'include_dirs': [
+        '../interface',
+      ],
+      'direct_dependent_settings': {
+        'include_dirs': [
+          '../interface',
+        ],
+      },
+      'sources': [
+        '../interface/pcm16b.h',
+        'pcm16b.c',
+      ],
+    },
+  ],
+}
+
+# Local Variables:
+# tab-width:2
+# indent-tabs-mode:nil
+# End:
+# vim: set expandtab tabstop=2 shiftwidth=2: