move to new cspot

components/spotify/cspot/bell/main/audio-codec/MP3Decoder.cpp

@@ -0,0 +1,47 @@
+#include "MP3Decoder.h"
+
+using namespace bell;
+
+MP3Decoder::MP3Decoder() {
+  mp3 = MP3InitDecoder();
+  pcmData =
+      (int16_t*)malloc(MAX_NSAMP * MAX_NGRAN * MAX_NCHAN * sizeof(int16_t));
+}
+
+MP3Decoder::~MP3Decoder() {
+  MP3FreeDecoder(mp3);
+  free(pcmData);
+}
+
+bool MP3Decoder::setup(uint32_t sampleRate, uint8_t channelCount,
+                       uint8_t bitDepth) {
+  return true;
+}
+
+bool MP3Decoder::setup(AudioContainer* container) {
+  return true;
+}
+
+uint8_t* MP3Decoder::decode(uint8_t* inData, uint32_t& inLen,
+                            uint32_t& outLen) {
+  if (!inData || inLen == 0)
+    return nullptr;
+  int status = MP3Decode(mp3, static_cast<unsigned char**>(&inData),
+                         reinterpret_cast<int*>(&inLen),
+                         static_cast<short*>(this->pcmData),
+                         /* useSize */ 0);
+  MP3GetLastFrameInfo(mp3, &frame);
+  if (status != ERR_MP3_NONE) {
+    lastErrno = status;
+    return nullptr;
+  }
+  if (sampleRate != frame.samprate) {
+    this->sampleRate = frame.samprate;
+  }
+
+  if (channelCount != frame.nChans) {
+    this->channelCount = frame.nChans;
+  }
+  outLen = frame.outputSamps * sizeof(int16_t);
+  return (uint8_t*)pcmData;
+}