Add codecs to librbcodec.

Change-Id: Id7f4717d51ed02d67cb9f9cb3c0ada4a81843f97
Reviewed-on: http://gerrit.rockbox.org/137
Reviewed-by: Nils Wallménius <nils@rockbox.org>
Tested-by: Nils Wallménius <nils@rockbox.org>

lib/rbcodec/codecs/libalac/decomp.h

@@ -0,0 +1,54 @@
+#ifndef __ALAC__DECOMP_H
+#define __ALAC__DECOMP_H
+
+#ifndef ICODE_ATTR_ALAC
+#define ICODE_ATTR_ALAC ICODE_ATTR
+#endif
+
+/* Always output samples shifted to 28 bits + sign*/
+#define ALAC_OUTPUT_DEPTH 29
+#define SCALE16 (ALAC_OUTPUT_DEPTH - 16)
+#define SCALE24 (ALAC_OUTPUT_DEPTH - 24)
+#define ALAC_MAX_CHANNELS 2
+#define ALAC_BLOCKSIZE 4096  /* Number of samples per channel per block */
+
+typedef struct
+{
+    unsigned char *input_buffer;
+    int input_buffer_bitaccumulator; /* used so we can do arbitary
+                                        bit reads */
+
+    /* rockbox: not used
+    int samplesize;
+    int numchannels;
+    int bytespersample; */
+
+    int bytes_consumed;
+
+    /* stuff from setinfo */
+    uint32_t setinfo_max_samples_per_frame; /* 0x1000 = 4096 */    /* max samples per frame? */
+    uint8_t setinfo_7a; /* 0x00 */
+    uint8_t setinfo_sample_size; /* 0x10 */
+    uint8_t setinfo_rice_historymult; /* 0x28 */
+    uint8_t setinfo_rice_initialhistory; /* 0x0a */
+    uint8_t setinfo_rice_kmodifier; /* 0x0e */
+    uint8_t setinfo_7f; /* 0x02 */
+    uint16_t setinfo_80; /* 0x00ff */
+    uint32_t setinfo_82; /* 0x000020e7 */
+    uint32_t setinfo_86; /* 0x00069fe4 */
+    uint32_t setinfo_8a_rate; /* 0x0000ac44 */
+    /* end setinfo stuff */
+} alac_file;
+
+/* rockbox: not used
+void create_alac(int samplesize, int numchannels, alac_file* alac)
+    ICODE_ATTR_ALAC; */
+
+int alac_decode_frame(alac_file *alac,
+                      unsigned char *inbuffer,
+                      int32_t outputbuffer[ALAC_MAX_CHANNELS][ALAC_BLOCKSIZE],
+                      void (*yield)(void)) ICODE_ATTR_ALAC;
+void alac_set_info(alac_file *alac, char *inputbuffer) ICODE_ATTR_ALAC;
+
+#endif /* __ALAC__DECOMP_H */
+