move to new cspot

components/spotify/cspot/bell/main/audio-containers/MP3Container.cpp

@@ -0,0 +1,48 @@
+#include "MP3Container.h"
+
+using namespace bell;
+
+MP3Container::MP3Container(std::istream& istr) : bell::AudioContainer(istr) {}
+
+bool MP3Container::fillBuffer() {
+  if (this->bytesInBuffer < MP3_MAX_FRAME_SIZE * 2) {
+    this->istr.read((char*)buffer.data() + bytesInBuffer,
+                    buffer.size() - bytesInBuffer);
+    this->bytesInBuffer += istr.gcount();
+  }
+  return this->bytesInBuffer >= MP3_MAX_FRAME_SIZE * 2;
+}
+
+std::byte* MP3Container::readSample(uint32_t& len) {
+  if (!this->fillBuffer()) {
+    len = 0;
+    return nullptr;
+  }
+
+  // Align the data if previous read was offseted
+  if (toConsume > 0 && toConsume <= bytesInBuffer) {
+    memmove(buffer.data(), buffer.data() + toConsume,
+            buffer.size() - toConsume);
+    bytesInBuffer = bytesInBuffer - toConsume;
+    toConsume = 0;
+  }
+
+  int startOffset =
+      MP3FindSyncWord((uint8_t*)this->buffer.data(), bytesInBuffer);
+
+  if (startOffset < 0) {
+    // Discard word
+    toConsume = MP3_MAX_FRAME_SIZE;
+    return nullptr;
+  }
+
+  len = bytesInBuffer - startOffset;
+
+  return this->buffer.data() + startOffset;
+}
+
+void MP3Container::parseSetupData() {
+  channels = 2;
+  sampleRate = bell::SampleRate::SR_44100;
+  bitWidth = bell::BitWidth::BW_16;
+}