+#define mpeg_seek(b, w) _mpeg_seek(size, srcpos, b, w)
+static int _mpeg_seek(unsigned int size, unsigned int &srcpos, unsigned int num,
+ int whence) {
+ unsigned int new_pos;
+
+ if (whence == SEEK_SET)
+ new_pos = num;
+ else if (whence == SEEK_CUR)
+ new_pos = srcpos + num;
+ else
+ abort();
+
+ if (new_pos >= size) {
+ srcpos = size;
+ return 1;
+ }
+
+ srcpos = new_pos;
+ return 0;
+}
+
+#define mpeg_tell() srcpos
+*/
+/*
+static int mpeg_run(demuxer_t *demuxer, unsigned char *srcbuf, unsigned int size) {
+ unsigned int len, idx, version, srcpos, packet_size;
+ int c, aid;
+ float pts;*/
+ /* Goto start of a packet, it starts with 0x000001?? */
+ /*const unsigned char wanted[] = { 0, 0, 1 };
+ unsigned char buf[5];
+ demux_packet_t *dp;
+ demux_stream_t *ds;
+ mkv_demuxer_t *mkv_d;
+
+ mkv_d = (mkv_demuxer_t *)demuxer->priv;
+ ds = demuxer->sub;
+
+ srcpos = 0;
+ packet_size = 0;
+ while (1) {
+ if (mpeg_read(buf, 4) != 4)
+ return -1;
+ while (memcmp(buf, wanted, sizeof(wanted)) != 0) {
+ c = mpeg_getc();
+ if (c < 0)
+ return -1;
+ memmove(buf, buf + 1, 3);
+ buf[3] = c;
+ }
+ switch (buf[3]) {
+ case 0xb9: */ /* System End Code */
+ /* return 0;
+ break;
+
+ case 0xba: */ /* Packet start code */
+ /* c = mpeg_getc();
+ if (c < 0)
+ return -1;
+ if ((c & 0xc0) == 0x40)
+ version = 4;
+ else if ((c & 0xf0) == 0x20)
+ version = 2;
+ else {
+ mp_msg(MSGT_DEMUX, MSGL_ERR, "[mkv] VobSub: Unsupported MPEG "
+ "version: 0x%02x\n", c);
+ return -1;
+ }
+
+ if (version == 4) {
+ if (mpeg_seek(9, SEEK_CUR))
+ return -1;
+ } else if (version == 2) {
+ if (mpeg_seek(7, SEEK_CUR))
+ return -1;
+ } else
+ abort();
+ break;
+
+ case 0xbd: */ /* packet */
+/* if (mpeg_read(buf, 2) != 2)
+ return -1;
+ len = buf[0] << 8 | buf[1];
+ idx = mpeg_tell();
+ c = mpeg_getc();
+ if (c < 0)
+ return -1;
+ if ((c & 0xC0) == 0x40) {*/ /* skip STD scale & size */
+/* if (mpeg_getc() < 0)
+ return -1;
+ c = mpeg_getc();
+ if (c < 0)
+ return -1;
+ }
+ if ((c & 0xf0) == 0x20) { */ /* System-1 stream timestamp */
+ /* Do we need this? */
+/* abort();
+ } else if ((c & 0xf0) == 0x30) {
+ */ /* Do we need this? */
+/* abort();
+ } else if ((c & 0xc0) == 0x80) {*/ /* System-2 (.VOB) stream */
+/* unsigned int pts_flags, hdrlen, dataidx;
+ c = mpeg_getc();
+ if (c < 0)
+ return -1;
+ pts_flags = c;
+ c = mpeg_getc();
+ if (c < 0)
+ return -1;
+ hdrlen = c;
+ dataidx = mpeg_tell() + hdrlen;
+ if (dataidx > idx + len) {
+ mp_msg(MSGT_DEMUX, MSGL_ERR, "[mkv] VobSub: Invalid header "
+ "length: %d (total length: %d, idx: %d, dataidx: %d)\n",
+ hdrlen, len, idx, dataidx);
+ return -1;
+ }
+ if ((pts_flags & 0xc0) == 0x80) {
+ if (mpeg_read(buf, 5) != 5)
+ return -1;
+ if (!(((buf[0] & 0xf0) == 0x20) && (buf[0] & 1) && (buf[2] & 1) &&
+ (buf[4] & 1))) {
+ mp_msg(MSGT_DEMUX, MSGL_ERR, "[mkv] VobSub PTS error: 0x%02x "
+ "%02x%02x %02x%02x \n",
+ buf[0], buf[1], buf[2], buf[3], buf[4]);
+ pts = 0;
+ } else
+ pts = ((buf[0] & 0x0e) << 29 | buf[1] << 22 |
+ (buf[2] & 0xfe) << 14 | buf[3] << 7 | (buf[4] >> 1));
+ } else*/ /* if ((pts_flags & 0xc0) == 0xc0) */// {
+ /* what's this? */
+ /* abort(); */
+ /* }
+ mpeg_seek(dataidx, SEEK_SET);
+ aid = mpeg_getc();
+ if (aid < 0) {
+ mp_msg(MSGT_DEMUX, MSGL_ERR, "[mkv] VobSub: Bogus aid %d\n", aid);
+ return -1;
+ }
+ packet_size = len - ((unsigned int)mpeg_tell() - idx);
+
+ dp = new_demux_packet(packet_size);
+ dp->flags = 1;
+ dp->pts = mkv_d->last_pts;
+ if (mpeg_read(dp->buffer, packet_size) != packet_size) {
+ mp_msg(MSGT_DEMUX, MSGL_ERR, "[mkv] VobSub: mpeg_read failure");
+ packet_size = 0;
+ return -1;
+ }
+ ds_add_packet(ds, dp);
+ idx = len;
+ }
+ break;
+
+ case 0xbe: */ /* Padding */
+ /* if (mpeg_read(buf, 2) != 2)
+ return -1;
+ len = buf[0] << 8 | buf[1];
+ if ((len > 0) && mpeg_seek(len, SEEK_CUR))
+ return -1;
+ break;
+
+ default:
+ if ((0xc0 <= buf[3]) && (buf[3] < 0xf0)) {
+ */ /* MPEG audio or video */
+ /* if (mpeg_read(buf, 2) != 2)
+ return -1;
+ len = (buf[0] << 8) | buf[1];
+ if ((len > 0) && mpeg_seek(len, SEEK_CUR))
+ return -1;
+
+ }
+ else {
+ mp_msg(MSGT_DEMUX, MSGL_ERR, "[mkv] VobSub: unknown header "
+ "0x%02X%02X%02X%02X\n", buf[0], buf[1], buf[2], buf[3]);
+ return -1;
+ }
+ }
+ }
+ return 0;
+}