move to new cspot

components/spotify/cspot/bell/main/audio-codec/OPUSDecoder.cpp

@@ -0,0 +1,45 @@
+#include "OPUSDecoder.h"
+#include "opus.h"
+
+using namespace bell;
+
+#define MAX_FRAME_SIZE 6 * 960
+#define MAX_CHANNELS 2
+
+// dummy structure, just to get access to channels
+struct OpusDecoder {
+  int dummy1;
+  int dummy2;
+  int channels;
+};
+
+OPUSDecoder::OPUSDecoder() {
+  opus = nullptr;
+  pcmData = (int16_t*)malloc(MAX_FRAME_SIZE * MAX_CHANNELS * sizeof(int16_t));
+}
+
+OPUSDecoder::~OPUSDecoder() {
+  if (opus)
+    opus_decoder_destroy(opus);
+  free(pcmData);
+}
+
+bool OPUSDecoder::setup(uint32_t sampleRate, uint8_t channelCount,
+                        uint8_t bitDepth) {
+  if (opus)
+    opus_decoder_destroy(opus);
+  opus = opus_decoder_create((int32_t)sampleRate, channelCount, &lastErrno);
+  return !lastErrno;
+}
+
+uint8_t* OPUSDecoder::decode(uint8_t* inData, uint32_t& inLen,
+                             uint32_t& outLen) {
+  if (!inData)
+    return nullptr;
+  outLen =
+      opus_decode(opus, static_cast<unsigned char*>(inData),
+                  static_cast<int32_t>(inLen), pcmData, MAX_FRAME_SIZE, false);
+  outLen *= opus->channels * sizeof(int16_t);
+  inLen = 0;
+  return (uint8_t*)pcmData;
+}