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;
}
@Override
public int read(final ByteBuffer bb, final int pos) {
this.m_isReset = false;
bb.position(pos);
while (bb.remaining() > 0) {
boolean needToProcessPacket = true;
if (this.m_decodeReady) {
final Info info = this.m_info[this.m_currentLink];
final int totalSamples = this.m_dspState.synthesis_pcmout(this.m_pcmf_buffer, this._index);
final float[][] pcm = this.m_pcmf_buffer[0];
if (totalSamples > 0) {
final int channelsCount = info.channelsCount;
final int bytesPerSample = channelsCount * 2;
int samples = Math.min(totalSamples, bb.remaining() / bytesPerSample);
samples = Math.min(samples, 8192 / bytesPerSample);
needToProcessPacket = (samples == totalSamples);
for (int i = 0; i < channelsCount; ++i) {
int ptr = i * 2;
final int mono = this._index[i];
for (int j = 0; j < samples; ++j) {
int val = (int) (pcm[i][mono + j] * 32767.0f);
if (val > 32767) {
val = 32767;
}
if (val < -32768) {
val = -32768;
}
if (val < 0) {
val |= 0x8000;
}
if (JOrbisStream.m_bigEndian) {
this.m_conversionBuffer[ptr] = (byte) (val >>> 8 & 0xFF);
this.m_conversionBuffer[ptr + 1] = (byte) (val & 0xFF);
} else {
this.m_conversionBuffer[ptr] = (byte) (val & 0xFF);
this.m_conversionBuffer[ptr + 1] = (byte) (val >>> 8 & 0xFF);
}
ptr += 2 * channelsCount;
}
}
final int writtenBytesLength = samples * bytesPerSample;
bb.put(this.m_conversionBuffer, 0, writtenBytesLength);
this.m_dspState.synthesis_read(samples);
this.m_pcmOffset += samples;
}
}
if (needToProcessPacket) {
switch (this.processPacket(true)) {
case 0:
{
return -(bb.position() - pos);
}
case -1:
{
return -(bb.position() - pos);
}
default:
{
continue;
}
}
}
}
return bb.position() - pos;
}