RTP: Refactor out G711 codecs into another file.

Change-Id: I38dbefef2315a28d44683e86a51e69f38e3f20ec

3 files changed, 141 insertions, 120 deletions

diff --git a/voip/jni/rtp/Android.mk b/voip/jni/rtp/Android.mk
index a364355..69afd49 100644
--- a/voip/jni/rtp/Android.mk
+++ b/voip/jni/rtp/Android.mk
@@ -22,6 +22,7 @@ LOCAL_MODULE := librtp_jni
 LOCAL_SRC_FILES := \
 	AudioCodec.cpp \
 	AudioGroup.cpp \
+	G711Codec.cpp \
 	RtpStream.cpp \
 	util.cpp \
 	rtp_jni.cpp
diff --git a/voip/jni/rtp/AudioCodec.cpp b/voip/jni/rtp/AudioCodec.cpp
index 4d8d36c..8912d82 100644
--- a/voip/jni/rtp/AudioCodec.cpp
+++ b/voip/jni/rtp/AudioCodec.cpp
@@ -18,124 +18,8 @@
 
 #include "AudioCodec.h"
 
-namespace {
-
-int8_t gExponents[128] = {
-    0, 1, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4,
-    5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
-    6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
-    6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
-    7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
-    7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
-    7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
-    7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
-};
-
-//------------------------------------------------------------------------------
-
-class UlawCodec : public AudioCodec
-{
-public:
-    int set(int sampleRate, const char *fmtp) {
-        mSampleCount = sampleRate / 50;
-        return mSampleCount;
-    }
-    int encode(void *payload, int16_t *samples);
-    int decode(int16_t *samples, void *payload, int length);
-private:
-    int mSampleCount;
-};
-
-int UlawCodec::encode(void *payload, int16_t *samples)
-{
-    int8_t *ulaws = (int8_t *)payload;
-    for (int i = 0; i < mSampleCount; ++i) {
-        int sample = samples[i];
-        int sign = (sample >> 8) & 0x80;
-        if (sample < 0) {
-            sample = -sample;
-        }
-        sample += 132;
-        if (sample > 32767) {
-            sample = 32767;
-        }
-        int exponent = gExponents[sample >> 8];
-        int mantissa = (sample >> (exponent + 3)) & 0x0F;
-        ulaws[i] = ~(sign | (exponent << 4) | mantissa);
-    }
-    return mSampleCount;
-}
-
-int UlawCodec::decode(int16_t *samples, void *payload, int length)
-{
-    int8_t *ulaws = (int8_t *)payload;
-    for (int i = 0; i < length; ++i) {
-        int ulaw = ~ulaws[i];
-        int exponent = (ulaw >> 4) & 0x07;
-        int mantissa = ulaw & 0x0F;
-        int sample = (((mantissa << 3) + 132) << exponent) - 132;
-        samples[i] = (ulaw < 0 ? -sample : sample);
-    }
-    return length;
-}
-
-AudioCodec *newUlawCodec()
-{
-    return new UlawCodec;
-}
-
-//------------------------------------------------------------------------------
-
-class AlawCodec : public AudioCodec
-{
-public:
-    int set(int sampleRate, const char *fmtp) {
-        mSampleCount = sampleRate / 50;
-        return mSampleCount;
-    }
-    int encode(void *payload, int16_t *samples);
-    int decode(int16_t *samples, void *payload, int length);
-private:
-    int mSampleCount;
-};
-
-int AlawCodec::encode(void *payload, int16_t *samples)
-{
-    int8_t *alaws = (int8_t *)payload;
-    for (int i = 0; i < mSampleCount; ++i) {
-        int sample = samples[i];
-        int sign = (sample >> 8) & 0x80;
-        if (sample < 0) {
-            sample = -sample;
-        }
-        if (sample > 32767) {
-            sample = 32767;
-        }
-        int exponent = gExponents[sample >> 8];
-        int mantissa = (sample >> (exponent == 0 ? 4 : exponent + 3)) & 0x0F;
-        alaws[i] = (sign | (exponent << 4) | mantissa) ^ 0xD5;
-    }
-    return mSampleCount;
-}
-
-int AlawCodec::decode(int16_t *samples, void *payload, int length)
-{
-    int8_t *alaws = (int8_t *)payload;
-    for (int i = 0; i < length; ++i) {
-        int alaw = alaws[i] ^ 0x55;
-        int exponent = (alaw >> 4) & 0x07;
-        int mantissa = alaw & 0x0F;
-        int sample = (exponent == 0 ? (mantissa << 4) + 8 :
-            ((mantissa << 3) + 132) << exponent);
-        samples[i] = (alaw < 0 ? sample : -sample);
-    }
-    return length;
-}
-
-AudioCodec *newAlawCodec()
-{
-    return new AlawCodec;
-}
+extern AudioCodec *newAlawCodec();
+extern AudioCodec *newUlawCodec();
 
 struct AudioCodecType {
     const char *name;
@@ -146,8 +30,6 @@ struct AudioCodecType {
     {NULL, NULL},
 };
 
-} // namespace
-
 AudioCodec *newAudioCodec(const char *codecName)
 {
     AudioCodecType *type = gAudioCodecTypes;
diff --git a/voip/jni/rtp/G711Codec.cpp b/voip/jni/rtp/G711Codec.cpp
new file mode 100644
index 0000000..091afa9
--- /dev/null
+++ b/voip/jni/rtp/G711Codec.cpp
@@ -0,0 +1,138 @@
+/*
+ * Copyrightm (C) 2010 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "AudioCodec.h"
+
+namespace {
+
+int8_t gExponents[128] = {
+    0, 1, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4,
+    5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
+    6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
+    6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
+    7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
+    7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
+    7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
+    7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
+};
+
+//------------------------------------------------------------------------------
+
+class UlawCodec : public AudioCodec
+{
+public:
+    int set(int sampleRate, const char *fmtp) {
+        mSampleCount = sampleRate / 50;
+        return mSampleCount;
+    }
+    int encode(void *payload, int16_t *samples);
+    int decode(int16_t *samples, void *payload, int length);
+private:
+    int mSampleCount;
+};
+
+int UlawCodec::encode(void *payload, int16_t *samples)
+{
+    int8_t *ulaws = (int8_t *)payload;
+    for (int i = 0; i < mSampleCount; ++i) {
+        int sample = samples[i];
+        int sign = (sample >> 8) & 0x80;
+        if (sample < 0) {
+            sample = -sample;
+        }
+        sample += 132;
+        if (sample > 32767) {
+            sample = 32767;
+        }
+        int exponent = gExponents[sample >> 8];
+        int mantissa = (sample >> (exponent + 3)) & 0x0F;
+        ulaws[i] = ~(sign | (exponent << 4) | mantissa);
+    }
+    return mSampleCount;
+}
+
+int UlawCodec::decode(int16_t *samples, void *payload, int length)
+{
+    int8_t *ulaws = (int8_t *)payload;
+    for (int i = 0; i < length; ++i) {
+        int ulaw = ~ulaws[i];
+        int exponent = (ulaw >> 4) & 0x07;
+        int mantissa = ulaw & 0x0F;
+        int sample = (((mantissa << 3) + 132) << exponent) - 132;
+        samples[i] = (ulaw < 0 ? -sample : sample);
+    }
+    return length;
+}
+
+//------------------------------------------------------------------------------
+
+class AlawCodec : public AudioCodec
+{
+public:
+    int set(int sampleRate, const char *fmtp) {
+        mSampleCount = sampleRate / 50;
+        return mSampleCount;
+    }
+    int encode(void *payload, int16_t *samples);
+    int decode(int16_t *samples, void *payload, int length);
+private:
+    int mSampleCount;
+};
+
+int AlawCodec::encode(void *payload, int16_t *samples)
+{
+    int8_t *alaws = (int8_t *)payload;
+    for (int i = 0; i < mSampleCount; ++i) {
+        int sample = samples[i];
+        int sign = (sample >> 8) & 0x80;
+        if (sample < 0) {
+            sample = -sample;
+        }
+        if (sample > 32767) {
+            sample = 32767;
+        }
+        int exponent = gExponents[sample >> 8];
+        int mantissa = (sample >> (exponent == 0 ? 4 : exponent + 3)) & 0x0F;
+        alaws[i] = (sign | (exponent << 4) | mantissa) ^ 0xD5;
+    }
+    return mSampleCount;
+}
+
+int AlawCodec::decode(int16_t *samples, void *payload, int length)
+{
+    int8_t *alaws = (int8_t *)payload;
+    for (int i = 0; i < length; ++i) {
+        int alaw = alaws[i] ^ 0x55;
+        int exponent = (alaw >> 4) & 0x07;
+        int mantissa = alaw & 0x0F;
+        int sample = (exponent == 0 ? (mantissa << 4) + 8 :
+            ((mantissa << 3) + 132) << exponent);
+        samples[i] = (alaw < 0 ? sample : -sample);
+    }
+    return length;
+}
+
+} // namespace
+
+AudioCodec *newUlawCodec()
+{
+    return new UlawCodec;
+}
+
+AudioCodec *newAlawCodec()
+{
+    return new AlawCodec;
+}