Flac refactor WIP

Signed-off-by: Mahyar Koshkouei <deltabeard@users.noreply.github.com>

source/flac.h

@@ -1 +1,41 @@
-int playFlac(const char* in);
+/**
+ * Set decoder parameters for flac.
+ *
+ * \param	decoder Structure to store parameters.
+ */
+void setFlac(struct decoder_fn* decoder);
+
+/**
+ * Initialise Flac decoder.
+ *
+ * \param	file	Location of flac file to play.
+ * \return			0 on success, else failure.
+ */
+int initFlac(const char* file);
+
+/**
+ * Get sampling rate of Flac file.
+ *
+ * \return	Sampling rate.
+ */
+uint32_t rateFlac(void);
+
+/**
+ * Get number of channels of Flac file.
+ *
+ * \return	Number of channels for opened file.
+ */
+uint8_t channelFlac(void);
+
+/**
+ * Decode part of open Flac file.
+ *
+ * \param buffer	Decoded output.
+ * \return			Samples read for each channel.
+ */
+uint64_t decodeFlac(void* buffer);
+
+/**
+ * Free Flac decoder.
+ */
+void exitFlac(void);