1 files changed, 150 insertions, 0 deletions

diff --git a/lib/rbcodec/metadata/vtx.c b/lib/rbcodec/metadata/vtx.c
new file mode 100644
index 0000000000..eb06528b29
--- /dev/null
+++ b/lib/rbcodec/metadata/vtx.c
@@ -0,0 +1,150 @@
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <ctype.h>
+#include <inttypes.h>
+#include "platform.h"
+
+#include "metadata.h"
+#include "metadata_common.h"
+#include "metadata_parsers.h"
+#include "rbunicode.h"
+#include "string-extra.h"
+
+typedef unsigned char  uchar;
+typedef unsigned short ushort;
+typedef unsigned int   uint;
+typedef unsigned long  ulong;
+
+typedef enum {
+    VTX_CHIP_AY = 0,            /* emulate AY */
+    VTX_CHIP_YM                 /* emulate YM */
+} vtx_chiptype_t;
+
+typedef enum {
+    VTX_LAYOUT_MONO = 0,
+    VTX_LAYOUT_ABC,
+    VTX_LAYOUT_ACB,
+    VTX_LAYOUT_BAC,
+    VTX_LAYOUT_BCA,
+    VTX_LAYOUT_CAB,
+    VTX_LAYOUT_CBA,
+    VTX_LAYOUT_CUSTOM
+} vtx_layout_t;
+
+typedef struct {
+    vtx_chiptype_t chiptype;    /* Type of sound chip */
+    vtx_layout_t layout;        /* stereo layout */
+    uint loop;                  /* song loop */
+    uint chipfreq;              /* AY chip freq (1773400 for ZX) */
+    uint playerfreq;            /* 50 Hz for ZX, 60 Hz for yamaha */
+    uint year;                  /* year song composed */
+    char *title;                /* song title */
+    char *author;               /* song author */
+    char *from;                 /* song from */
+    char *tracker;              /* tracker */
+    char *comment;              /* comment */
+    uint regdata_size;          /* size of unpacked data */
+    uint frames;                /* number of AY data frames */
+} vtx_info_t;
+
+#define VTX_STRING_MAX 254
+
+static uint Reader_ReadByte(int fd) {
+    unsigned char c;
+    read(fd, &c, sizeof(c));
+    return c;
+}
+
+static uint Reader_ReadWord(int fd) {
+    unsigned short s;
+    read(fd, &s, sizeof(s));
+    return letoh16(s);
+}
+
+static uint Reader_ReadDWord(int fd) {
+    unsigned int i;
+    read(fd, &i, sizeof(i));
+    return letoh32(i);
+}
+
+static char* Reader_ReadString(int fd, char *str) {
+    int i = 0;
+    char c = 1;
+    char *p = str;
+
+    if (str)
+        *str = 0;
+
+    while (i < VTX_STRING_MAX && c) {
+        read(fd, &c, sizeof(c));
+        if (str)
+            *str++ = c;
+        i++;
+    }
+
+    if (str)
+       *str = 0;
+
+    return p;
+}
+
+/* vtx info */
+
+bool get_vtx_metadata(int fd, struct mp3entry* id3)
+{
+    vtx_info_t info;
+    char *p = id3->id3v2buf;
+    char buf[VTX_STRING_MAX+1];
+
+    if (lseek(fd, 0, SEEK_SET) < 0)
+        goto exit_bad;
+
+    if (filesize(fd) < 20)
+        goto exit_bad;
+
+    uint hdr = Reader_ReadWord(fd);
+
+    if ((hdr != 0x7961) && (hdr != 0x6d79))
+        goto exit_bad;
+
+    info.layout = (vtx_layout_t)Reader_ReadByte(fd);
+    info.loop = Reader_ReadWord(fd);
+    info.chipfreq = Reader_ReadDWord(fd);
+    info.playerfreq = Reader_ReadByte(fd);
+    info.year = Reader_ReadWord(fd);
+    info.regdata_size = Reader_ReadDWord(fd);
+    info.frames = info.regdata_size / 14;
+    info.title = Reader_ReadString(fd, buf);
+    if (buf[0]) {
+        /* Title */
+        id3->title = p;
+        p += strlcpy(p, info.title, VTX_STRING_MAX) + 1;
+    }
+    info.author = Reader_ReadString(fd, buf);
+    if (buf[0]) {
+        /* Artist */
+        id3->artist = p;
+        p += strlcpy(p, info.author, VTX_STRING_MAX) + 1;
+    }
+    info.from = Reader_ReadString(fd, NULL);
+    info.tracker = Reader_ReadString(fd, NULL);
+    info.comment = Reader_ReadString(fd, buf);
+    if (buf[0]) {
+        /* Comment */
+        id3->comment = p;
+        p += strlcpy(p, info.comment, VTX_STRING_MAX) + 1;
+    }
+
+    id3->vbr = false;
+    id3->bitrate = 706;
+    id3->frequency = 44100; // XXX allow this to be configured?
+
+    id3->filesize = filesize(fd);
+    id3->length = info.frames * 1000 / info.playerfreq;
+
+    return true;
+
+exit_bad:
+    return false;
+}