am 4c5d28ce: RTP: move into frameworks.

#

# Copyright (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.

#

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)

LOCAL_MODULE := librtp_jni

LOCAL_SRC_FILES := \

	AudioCodec.cpp \

	AudioGroup.cpp \

	RtpStream.cpp \

	util.cpp \

	rtp_jni.cpp

LOCAL_SHARED_LIBRARIES := \

	libnativehelper \

	libcutils \

	libutils \

	libmedia

LOCAL_STATIC_LIBRARIES :=

LOCAL_C_INCLUDES += \

	$(JNI_H_INCLUDE)

LOCAL_CFLAGS += -fvisibility=hidden

LOCAL_PRELINK_MODULE := false

include $(BUILD_SHARED_LIBRARY)

/*

 * 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 <string.h>

#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:

    bool set(int sampleRate, int sampleCount) {

        mSampleCount = sampleCount;

        return sampleCount > 0;

    }

    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:

    bool set(int sampleRate, int sampleCount) {

        mSampleCount = sampleCount;

        return sampleCount > 0;

    }

    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;

}

struct AudioCodecType {

    const char *name;

    AudioCodec *(*create)();

} gAudioCodecTypes[] = {

    {"PCMA", newAlawCodec},

    {"PCMU", newUlawCodec},

    {NULL, NULL},

};

} // namespace

AudioCodec *newAudioCodec(const char *codecName)

{

    AudioCodecType *type = gAudioCodecTypes;

    while (type->name != NULL) {

        if (strcmp(codecName, type->name) == 0) {

            return type->create();

        }

        ++type;

    }

    return NULL;

}

/*

 * 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 <stdint.h>

#ifndef __AUDIO_CODEC_H__

#define __AUDIO_CODEC_H__

class AudioCodec

{

public:

    virtual ~AudioCodec() {}

    // Returns true if initialization succeeds.

    virtual bool set(int sampleRate, int sampleCount) = 0;

    // Returns the length of payload in bytes.

    virtual int encode(void *payload, int16_t *samples) = 0;

    // Returns the number of decoded samples.

    virtual int decode(int16_t *samples, void *payload, int length) = 0;

};

AudioCodec *newAudioCodec(const char *codecName);

#endif