private boolean openSeekable() {
final Info initialInfo = new Info();
final Comment initialComment = new Comment();
this.m_chunkSize = Math.min(8500, (int) length(this.m_vorbisStream));
final Page page = new Page();
final int[] testSerialno = {0};
final int ret = this.fetchHeaders(initialInfo, initialComment, testSerialno, null);
final int serialno = testSerialno[0];
final int dataOffset = (int) this.m_offset;
this.m_oggStreamState.clear();
if (ret < 0) {
return false;
}
seek(this.m_vorbisStream, 0L, 1);
this.m_offset = tell(this.m_vorbisStream);
final long end = this.getPreviousPage(page);
if (page.serialno() != serialno) {
if (this.bisectForwardSerialno(0L, 0L, end + 1L, serialno, 0) < 0) {
return false;
}
} else if (this.bisectForwardSerialno(0L, end, end + 1L, serialno, 0) < 0) {
return false;
}
this.prefetchAllHeaders(initialInfo, initialComment, dataOffset);
this.rawSeek(this.m_dataOffsets[0]);
return true;
}
public int fetchHeaders(final Info info, final Comment comment, final int[] serialno, Page page) {
if (page == null) {
page = new Page();
final int retValue = this.getNextPage(page, this.m_chunkSize);
if (retValue == -128) {
return -128;
}
if (retValue < 0) {
return -130;
}
}
if (serialno != null) {
serialno[0] = page.serialno();
}
this.m_oggStreamState.init(page.serialno());
info.init();
comment.init();
final Packet packet = new Packet();
int i = 0;
while (i < 3) {
this.m_oggStreamState.pagein(page);
while (i < 3) {
final int result = this.m_oggStreamState.packetout(packet);
if (result == 0) {
break;
}
if (result == -1) {
info.clear();
this.m_oggStreamState.clear();
return -1;
}
if (info.synthesis_headerin(comment, packet) != 0) {
info.clear();
this.m_oggStreamState.clear();
return -1;
}
++i;
}
if (i < 3 && this.getNextPage(page, 1L) < 0) {
info.clear();
this.m_oggStreamState.clear();
return -1;
}
}
return 0;
}
private int bisectForwardSerialno(
final long begin, long searched, final long end, final int currentno, final int m) {
long endsearched = end;
long next = end;
final Page page = new Page();
while (searched < endsearched) {
long bisect;
if (endsearched - searched < this.m_chunkSize) {
bisect = searched;
} else {
bisect = (searched + endsearched) / 2L;
}
this.seekHelper(bisect);
final int ret = this.getNextPage(page, -1L);
if (ret == -128) {
return -128;
}
if (ret < 0 || page.serialno() != currentno) {
endsearched = bisect;
if (ret < 0) {
continue;
}
next = ret;
} else {
searched = ret + page.header_len + page.body_len;
}
}
this.seekHelper(next);
int ret = this.getNextPage(page, -1L);
if (ret == -128) {
return -128;
}
if (searched >= end || ret == -1) {
this.m_links = m + 1;
(this.m_offsets = new long[m + 2])[m + 1] = searched;
} else {
ret = this.bisectForwardSerialno(next, this.m_offset, end, page.serialno(), m + 1);
if (ret == -128) {
return -128;
}
}
this.m_offsets[m] = begin;
return 0;
}
private void prefetchAllHeaders(
final Info firstInfo, final Comment firstComment, final int dataoffset) {
final Page page = new Page();
this.m_info = new Info[this.m_links];
this.m_comments = new Comment[this.m_links];
this.m_dataOffsets = new long[this.m_links];
this.m_pcmLengths = new long[this.m_links];
this.m_serialnos = new int[this.m_links];
for (int i = 0; i < this.m_links; ++i) {
if (firstInfo != null && firstComment != null && i == 0) {
this.m_info[i] = firstInfo;
this.m_comments[i] = firstComment;
this.m_dataOffsets[i] = dataoffset;
} else {
this.seekHelper(this.m_offsets[i]);
this.m_info[i] = new Info();
this.m_comments[i] = new Comment();
if (this.fetchHeaders(this.m_info[i], this.m_comments[i], null, null) == -1) {
this.m_dataOffsets[i] = -1L;
} else {
this.m_dataOffsets[i] = this.m_offset;
this.m_oggStreamState.clear();
}
}
final long end = this.m_offsets[i + 1];
this.seekHelper(end);
while (true) {
final int ret = this.getPreviousPage(page);
if (ret == -1) {
this.m_info[i].clear();
break;
}
if (page.granulepos() != -1L) {
this.m_serialnos[i] = page.serialno();
this.m_pcmLengths[i] = page.granulepos();
break;
}
}
}
}
