75 lines
1.6 KiB
C++
75 lines
1.6 KiB
C++
/*
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* Copyrightm (C) 2010 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "AudioCodec.h"
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extern "C" {
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#include "gsm.h"
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}
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namespace {
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class GsmCodec : public AudioCodec
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{
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public:
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GsmCodec() {
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mEncode = gsm_create();
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mDecode = gsm_create();
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}
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~GsmCodec() {
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if (mEncode) {
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gsm_destroy(mEncode);
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}
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if (mDecode) {
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gsm_destroy(mDecode);
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}
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}
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int set(int sampleRate, const char *fmtp) {
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return (sampleRate == 8000 && mEncode && mDecode) ? 160 : -1;
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}
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int encode(void *payload, int16_t *samples);
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int decode(int16_t *samples, void *payload, int length);
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private:
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gsm mEncode;
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gsm mDecode;
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};
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int GsmCodec::encode(void *payload, int16_t *samples)
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{
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gsm_encode(mEncode, samples, (unsigned char *)payload);
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return 33;
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}
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int GsmCodec::decode(int16_t *samples, void *payload, int length)
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{
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if (length == 33 &&
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gsm_decode(mDecode, (unsigned char *)payload, samples) == 0) {
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return 160;
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}
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return -1;
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}
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} // namespace
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AudioCodec *newGsmCodec()
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{
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return new GsmCodec;
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}
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