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author | Chia-chi Yeh <chiachi@android.com> | 2010-09-29 05:46:19 +0800 |
---|---|---|
committer | Chia-chi Yeh <chiachi@android.com> | 2010-09-29 05:46:19 +0800 |
commit | 78c11b3cf170fdd35ff6984bc2a64c01e2457503 (patch) | |
tree | 18d5e3de2f7195f080255b4e481aac93df7351da /voip | |
parent | 245475925eff61ee76bde58de69253a889e39d0a (diff) | |
download | frameworks_base-78c11b3cf170fdd35ff6984bc2a64c01e2457503.zip frameworks_base-78c11b3cf170fdd35ff6984bc2a64c01e2457503.tar.gz frameworks_base-78c11b3cf170fdd35ff6984bc2a64c01e2457503.tar.bz2 |
RTP: Refactor out G711 codecs into another file.
Change-Id: I38dbefef2315a28d44683e86a51e69f38e3f20ec
Diffstat (limited to 'voip')
-rw-r--r-- | voip/jni/rtp/Android.mk | 1 | ||||
-rw-r--r-- | voip/jni/rtp/AudioCodec.cpp | 122 | ||||
-rw-r--r-- | voip/jni/rtp/G711Codec.cpp | 138 |
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; +} |