Start on built-in LAME

Using LAME 3.10
Windows project files substantially changed from original, and included into audacity solution.

lib-src/libmp3lame/id3tag.h

@@ -0,0 +1,64 @@
+
+#ifndef LAME_ID3_H
+#define LAME_ID3_H
+
+
+#define CHANGED_FLAG    (1U << 0)
+#define ADD_V2_FLAG     (1U << 1)
+#define V1_ONLY_FLAG    (1U << 2)
+#define V2_ONLY_FLAG    (1U << 3)
+#define SPACE_V1_FLAG   (1U << 4)
+#define PAD_V2_FLAG     (1U << 5)
+
+enum {
+    MIMETYPE_NONE = 0,
+    MIMETYPE_JPEG,
+    MIMETYPE_PNG,
+    MIMETYPE_GIF
+};
+
+typedef struct FrameDataNode {
+    struct FrameDataNode *nxt;
+    uint32_t fid;             /* Frame Identifier                 */
+    char    lng[4];          /* 3-character language descriptor  */
+    struct {
+        union {
+            char   *l;       /* ptr to Latin-1 chars             */
+            unsigned short *u; /* ptr to UCS-2 text                */
+            unsigned char *b; /* ptr to raw bytes                 */
+        } ptr;
+        size_t  dim;
+        int     enc;         /* 0:Latin-1, 1:UCS-2, 2:RAW        */
+    } dsc  , txt;
+} FrameDataNode;
+
+
+typedef struct id3tag_spec {
+    /* private data members */
+    unsigned int flags;
+    int     year;
+    char   *title;
+    char   *artist;
+    char   *album;
+    char   *comment;
+    int     track_id3v1;
+    int     genre_id3v1;
+    unsigned char *albumart;
+    unsigned int albumart_size;
+    unsigned int padding_size;
+    int     albumart_mimetype;
+    char    language[4]; /* the language of the frame's content, according to ISO-639-2 */
+    FrameDataNode *v2_head, *v2_tail;
+} id3tag_spec;
+
+
+/* write tag into stream at current position */
+extern int id3tag_write_v2(lame_global_flags * gfp);
+extern int id3tag_write_v1(lame_global_flags * gfp);
+/*
+ * NOTE: A version 2 tag will NOT be added unless one of the text fields won't
+ * fit in a version 1 tag (e.g. the title string is longer than 30 characters),
+ * or the "id3tag_add_v2" or "id3tag_v2_only" functions are used.
+ */
+
+#endif