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-rw-r--r--lib/rbcodec/metadata/vtx.c150
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;
+}