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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/***************************************************************************
* opusencoder.cc
*
* Fri Sep 19 19:21:50 CEST 2014
* Copyright 2014 Bent Bisballe Nyeng
* deva@aasimon.org
****************************************************************************/
/*
* This file is part of SimpleRTP.
*
* SimpleRTP is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* SimpleRTP is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with SimpleRTP; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
#include "opusencoder.h"
#include <string.h>
#include <stdio.h>
// 500 to 512000
#define OPUS_BITRATE 64000
// Frame size 10ms
#define OPUS_FRAME_SIZE 10
OpusEncoder::OpusEncoder()
: cache(5760 * 10)
{
int err = 0;
encoder = opus_encoder_create(16000, 1, OPUS_APPLICATION_AUDIO, &err);
if(!encoder || err != OPUS_OK) {
printf("opus_encoder_create: %d\n", err);
}
opus_encoder_ctl(encoder, OPUS_SET_BITRATE(OPUS_BITRATE));
// [0-10] with 10 representing the highest complexity.
opus_encoder_ctl(encoder, OPUS_SET_COMPLEXITY(10));
}
OpusEncoder::~OpusEncoder()
{
if(encoder) opus_encoder_destroy(encoder);
}
unsigned int OpusEncoder::framesize()
{
return 16000 / 1000 * OPUS_FRAME_SIZE; // 10ms audio data
}
framelist_t OpusEncoder::encode(const char *pcm, size_t size)
{
framelist_t list;
if(encoder == NULL) {
//throw InitException();
printf("encoder == NULL\n");
}
size_t bytes_per_packet = ((OPUS_BITRATE *framesize())/16000+4)/8;
cache.addSamples((short*)pcm, size / sizeof(short));
//size_t p = 0;
opus_int16 *samples = new opus_int16[framesize()];
while(cache.cacheSize() >= framesize()) {
size_t sz = cache.getSamples(samples, framesize());
Frame *frame = new Frame(bytes_per_packet);
int n = opus_encode(encoder, samples, sz / 1,
(unsigned char *)frame->data, (opus_int32)frame->size);
if(n < 0) {
printf("opus_encode: %d\n", n);
}
frame->size = n;
list.push_back(frame);
}
delete[] samples;
return list;
}
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