From 46d4e577bceb12c9463fdf4ef1d9a9a348f13543 Mon Sep 17 00:00:00 2001
From: Bent Bisballe Nyeng <deva@aasimon.org>
Date: Fri, 19 Sep 2014 20:53:09 +0200
Subject: AudioHandler, AudioInput, Opus ecoder code in place.

---
 src/opusencoder.cc | 133 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 133 insertions(+)
 create mode 100644 src/opusencoder.cc

(limited to 'src/opusencoder.cc')

diff --git a/src/opusencoder.cc b/src/opusencoder.cc
new file mode 100644
index 0000000..77ea0d1
--- /dev/null
+++ b/src/opusencoder.cc
@@ -0,0 +1,133 @@
+/* -*- 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 <opus/opus.h>
+#include <stdio.h>
+
+#include "samplecache.h"
+
+#define OPUS_BITRATE 64000
+
+struct opus_encoder_private_t {
+  OpusEncoder *ce;
+  SampleCache *cache;
+};
+
+OpusEncoder::OpusEncoder()
+{
+  prv = new struct opus_encoder_private_t;
+
+  prv->cache = new SampleCache(5760 * 10);
+
+  int error = 0;
+
+  samplerate_t srate = opus_samplerate();
+
+  prv->ce =
+    opus_encoder_create(srate, 1/*channels()*/, OPUS_APPLICATION_AUDIO, &error);
+  if(!prv->ce || error != OPUS_OK) {
+    printf("srate: %d, ch: %d, Error: %d\n", srate, 1/*channels()*/, error);
+    //throw InitException();
+  }
+
+  // 500 to 512000
+  opus_encoder_ctl(prv->ce, OPUS_SET_BITRATE(OPUS_BITRATE/*bitrate()*/));
+
+  // [0-10] with 10 representing the highest complexity.
+  opus_encoder_ctl(prv->ce, OPUS_SET_COMPLEXITY(10));
+
+  /*
+  printf("Encoder(fs: %d, ch: %d, bitrate: %d)\n", srate, channels(),
+         bitrate());
+  */
+}
+
+OpusEncoder::~OpusEncoder()
+{
+  if(prv) {
+    if(prv->ce) opus_encoder_destroy(prv->ce);
+    if(prv->cache) delete prv->cache;
+    delete prv;
+  }
+}
+
+unsigned int OpusEncoder::framesize()
+{
+  return opus_samplerate() / 1000 * OPUS_FRAME_SIZE; // 10ms audio data
+}
+
+samplerate_t OpusEncoder::opus_samplerate()
+{
+  return 48000;
+}
+
+framelist_t OpusEncoder::encode(const char *pcm, size_t size)
+{
+  framelist_t list;
+
+  //  printf("PCM size: %d\n", size);
+
+  samplerate_t srate = opus_samplerate();
+
+  if(prv->ce == NULL) {
+    //throw InitException();
+    printf("prv->ce == NULL\n");
+  }
+
+  size_t bytes_per_packet = ((OPUS_BITRATE/*bitrate()*/ *framesize())/srate+4)/8;
+
+  prv->cache->addSamples((short*)pcm, size / sizeof(short));
+
+  //size_t p = 0;
+  opus_int16 *samples = new opus_int16[framesize()];
+  while(prv->cache->cacheSize() >= framesize()) {
+    size_t sz = prv->cache->getSamples(samples, framesize());
+
+    Frame *frame = new Frame(bytes_per_packet);
+
+    int n = opus_encode(prv->ce, samples, sz / 1/*channels()*//*sizeof(short)*/,
+                        (unsigned char *)frame->data, (opus_int32)frame->size);
+
+    //printf("Compressed to %d\n", n);
+
+    if(n < 0) {
+      printf("n < 0\n");
+      //throw EncodingException();
+    }
+
+    frame->size = n;
+
+    list.push_back(frame);
+  }
+  delete[] samples;
+
+  //printf("%d frames in list\n", list.size());
+
+  return list;
+}
-- 
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