jni: add libmpg123

app/src/main/cpp/mp3file.h

@@ -0,0 +1,30 @@
+//
+// Created by david on 17.05.20.
+//
+
+#ifndef SAMPLES_MP3FILE_H
+#define SAMPLES_MP3FILE_H
+
+#include "mpg123.h"
+
+struct MP3File
+{
+    mpg123_handle* handle;
+    int channels;
+    long rate;
+    long num_samples;
+    int samples_per_frame;
+    double secs_per_frame;
+    long num_frames;
+    double duration;
+    size_t buffer_size;
+    unsigned char* buffer;
+    size_t leftSamples;
+    size_t offset;
+};
+
+MP3File* mp3file_init(mpg123_handle *handle);
+void mp3file_delete(MP3File *mp3file);
+MP3File* mp3file_open(const char *filename, int forceEncoding = 0);
+
+#endif //SAMPLES_MP3FILE_H