update cspot

components/spotify/cspot/bell/src/audio/codec/MP3Decoder.cpp

@@ -0,0 +1,35 @@
+// Copyright (c) Kuba Szczodrzyński 2022-1-14.
+
+#include "MP3Decoder.h"
+
+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;
+}
+
+uint8_t *MP3Decoder::decode(uint8_t *inData, uint32_t inLen, uint32_t &outLen) {
+	if (!inData)
+		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;
+	}
+	outLen = frame.outputSamps * sizeof(int16_t);
+	return (uint8_t *)pcmData;
+}