all: move headers to include folder

Signed-off-by: Mahyar Koshkouei <mk@deltabeard.com>

include/flac.h

@@ -0,0 +1,51 @@
+#include "playback.h"
+
+/**
+ * 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);
+
+/**
+ * Checks if the input file is Flac
+ *
+ * \param in	Input file.
+ * \return		0 if Flac file, else not or failure.
+ */
+int isFlac(const char* in);