35d05dcba1
RFC 3551 section 4.2 said that a receiver should accept packets representing between 0 and 200ms of audio data. Now we add the ability to decode multiple frames in a payload as long as the jitter buffer is not full. This change covers G711, GSM, and GSM-EFR. AMR will be added later. Bug: 3029736 Change-Id: Ifd194596766d14f02177925c58432cd620e44dd7
79 lines
1.8 KiB
C++
79 lines
1.8 KiB
C++
/*
|
|
* 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"
|
|
|
|
extern "C" {
|
|
#include "gsm.h"
|
|
}
|
|
|
|
namespace {
|
|
|
|
class GsmCodec : public AudioCodec
|
|
{
|
|
public:
|
|
GsmCodec() {
|
|
mEncode = gsm_create();
|
|
mDecode = gsm_create();
|
|
}
|
|
|
|
~GsmCodec() {
|
|
if (mEncode) {
|
|
gsm_destroy(mEncode);
|
|
}
|
|
if (mDecode) {
|
|
gsm_destroy(mDecode);
|
|
}
|
|
}
|
|
|
|
int set(int sampleRate, const char *fmtp) {
|
|
return (sampleRate == 8000 && mEncode && mDecode) ? 160 : -1;
|
|
}
|
|
|
|
int encode(void *payload, int16_t *samples);
|
|
int decode(int16_t *samples, int count, void *payload, int length);
|
|
|
|
private:
|
|
gsm mEncode;
|
|
gsm mDecode;
|
|
};
|
|
|
|
int GsmCodec::encode(void *payload, int16_t *samples)
|
|
{
|
|
gsm_encode(mEncode, samples, (unsigned char *)payload);
|
|
return 33;
|
|
}
|
|
|
|
int GsmCodec::decode(int16_t *samples, int count, void *payload, int length)
|
|
{
|
|
unsigned char *bytes = (unsigned char *)payload;
|
|
int n = 0;
|
|
while (n + 160 <= count && length >= 33 &&
|
|
gsm_decode(mDecode, bytes, &samples[n]) == 0) {
|
|
n += 160;
|
|
length -= 33;
|
|
bytes += 33;
|
|
}
|
|
return n;
|
|
}
|
|
|
|
} // namespace
|
|
|
|
AudioCodec *newGsmCodec()
|
|
{
|
|
return new GsmCodec;
|
|
}
|