98 lines
2.4 KiB
C++
98 lines
2.4 KiB
C++
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/*
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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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#include "gsmamr_dec.h"
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#include "gsmamr_enc.h"
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namespace {
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class GsmEfrCodec : public AudioCodec
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{
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public:
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GsmEfrCodec() {
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if (AMREncodeInit(&mEncoder, &mSidSync, false)) {
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mEncoder = NULL;
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}
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if (GSMInitDecode(&mDecoder, (Word8 *)"RTP")) {
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mDecoder = NULL;
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}
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}
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~GsmEfrCodec() {
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if (mEncoder) {
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AMREncodeExit(&mEncoder, &mSidSync);
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}
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if (mDecoder) {
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GSMDecodeFrameExit(&mDecoder);
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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 && mEncoder && mDecoder) ? 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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void *mEncoder;
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void *mSidSync;
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void *mDecoder;
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};
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int GsmEfrCodec::encode(void *payload, int16_t *samples)
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{
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unsigned char *bytes = (unsigned char *)payload;
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Frame_Type_3GPP type;
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int length = AMREncode(mEncoder, mSidSync, MR122,
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samples, bytes, &type, AMR_TX_WMF);
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if (type == AMR_122 && length == 32) {
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bytes[0] = 0xC0 | (bytes[1] >> 4);
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for (int i = 1; i < 31; ++i) {
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bytes[i] = (bytes[i] << 4) | (bytes[i + 1] >> 4);
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}
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return 31;
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}
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return -1;
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}
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int GsmEfrCodec::decode(int16_t *samples, void *payload, int length)
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{
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unsigned char *bytes = (unsigned char *)payload;
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if (length == 31 && (bytes[0] >> 4) == 0x0C) {
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for (int i = 0; i < 30; ++i) {
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bytes[i] = (bytes[i] << 4) | (bytes[i + 1] >> 4);
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}
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bytes[30] <<= 4;
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if (AMRDecode(mDecoder, AMR_122, bytes, samples, MIME_IETF) == 31) {
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return 160;
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}
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}
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return -1;
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}
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} // namespace
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AudioCodec *newGsmEfrCodec()
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{
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return new GsmEfrCodec;
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}
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