com.github.axet.libogg.Jogg_page Maven / Gradle / Ivy
package com.github.axet.libogg;
/**
* ogg_page is used to encapsulate the data in one Ogg bitstream page.
*
Changes from C to Java:
* byte data = header_base[header]
* int data = ((int)header_base[header]) & 0xff
* byte data = body_base[body]
* int data = ((int)body_base[body]) & 0xff
*/
public final class Jogg_page {
public byte[] header_base = null;
public int header = 0;
public int header_len = 0;
public byte[] body_base = null;
public int body = 0;
public int body_len = 0;
//
public void clear() {
header_base = null;
header = 0;
header_len = 0;
body_base = null;
body = 0;
body_len = 0;
}
// framing.c
public final int ogg_page_version() {
return ((int)header_base[header + 4]) & 0xff;
}
public final boolean ogg_page_continued() {
return ((header_base[header + 5]) & 0x01) != 0;
}
public final boolean ogg_page_bos() {
return ((header_base[header + 5]) & 0x02) != 0;
}
public final boolean ogg_page_eos() {
return ((header_base[header + 5]) & 0x04) != 0;
}
public final long ogg_page_granulepos() {
final byte[] page = this.header_base;
int hi = this.header + 13;
long granulepos = ((long)page[hi--]) & (0xff);
granulepos = (granulepos << 8) | (((long)page[hi--]) & 0xff);
granulepos = (granulepos << 8) | (((long)page[hi--]) & 0xff);
granulepos = (granulepos << 8) | (((long)page[hi--]) & 0xff);
granulepos = (granulepos << 8) | (((long)page[hi--]) & 0xff);
granulepos = (granulepos << 8) | (((long)page[hi--]) & 0xff);
granulepos = (granulepos << 8) | (((long)page[hi--]) & 0xff);
granulepos = (granulepos << 8) | (((long)page[hi]) & 0xff);
return granulepos;
}
public final int ogg_page_serialno() {
int hi = this.header + 14;
final byte[] hdr = this.header_base;
int ret = ((int)hdr[hi++]) & 0xff;
ret |= (((int)hdr[hi++]) & 0xff) << 8;
ret |= (((int)hdr[hi++]) & 0xff) << 16;
ret |= ((int)hdr[hi]) << 24;
return ret;
}
/** long ogg_page_pageno(const ogg_page *og) */
public final int ogg_page_pageno() {
int hi = this.header + 18;
final byte[] hdr = this.header_base;
int ret = ((int)hdr[hi++]) & 0xff;
ret |= (((int)hdr[hi++]) & 0xff) << 8;
ret |= (((int)hdr[hi++]) & 0xff) << 16;
ret |= ((int)hdr[hi]) << 24;
return ret;
}
/** returns the number of packets that are completed on this page (if
the leading packet is begun on a previous page, but ends on this
page, it's counted
* NOTE:
If a page consists of a packet begun on a previous page, and a new
packet begun (but not completed) on this page, the return will be:
ogg_page_packets(page) ==1,
ogg_page_continued(page) !=0
If a page happens to be a single packet that was begun on a
previous page, and spans to the next page (in the case of a three or
more page packet), the return will be:
ogg_page_packets(page) ==0,
ogg_page_continued(page) !=0
*/
public final int ogg_page_packets() {
int hi = this.header + 26;
final byte[] hdr = this.header_base;
int count = 0;
for( int i = 0, n = ((int)hdr[hi++]) & 0xff; i < n; i++ ) {
if( ((int)hdr[hi++]) != -1 ) {
count++;
}
}
return count;
}
/* helper to initialize lookup for direct-table CRC (illustrative; we
use the static init below) */
/** private static ogg_uint32_t _ogg_crc_entry(unsigned long index) */
/*
private static int _ogg_crc_entry(int index) {
int i;
int r;// unsigned long r;
r = index << 24;
for( i = 0; i < 8; i++ )
if( r & 0x80000000 )
r = (r << 1) ^ 0x04c11db7; // The same as the ethernet generator
// polynomial, although we use an
// unreflected alg and an init/final
// of 0, not 0xffffffff
else
r <<= 1;
return (r & 0xffffffff);
}
*/
/** static const ogg_uint32_t crc_lookup[256] = */
private static final int[] crc_lookup = {
0x00000000,0x04c11db7,0x09823b6e,0x0d4326d9,
0x130476dc,0x17c56b6b,0x1a864db2,0x1e475005,
0x2608edb8,0x22c9f00f,0x2f8ad6d6,0x2b4bcb61,
0x350c9b64,0x31cd86d3,0x3c8ea00a,0x384fbdbd,
0x4c11db70,0x48d0c6c7,0x4593e01e,0x4152fda9,
0x5f15adac,0x5bd4b01b,0x569796c2,0x52568b75,
0x6a1936c8,0x6ed82b7f,0x639b0da6,0x675a1011,
0x791d4014,0x7ddc5da3,0x709f7b7a,0x745e66cd,
0x9823b6e0,0x9ce2ab57,0x91a18d8e,0x95609039,
0x8b27c03c,0x8fe6dd8b,0x82a5fb52,0x8664e6e5,
0xbe2b5b58,0xbaea46ef,0xb7a96036,0xb3687d81,
0xad2f2d84,0xa9ee3033,0xa4ad16ea,0xa06c0b5d,
0xd4326d90,0xd0f37027,0xddb056fe,0xd9714b49,
0xc7361b4c,0xc3f706fb,0xceb42022,0xca753d95,
0xf23a8028,0xf6fb9d9f,0xfbb8bb46,0xff79a6f1,
0xe13ef6f4,0xe5ffeb43,0xe8bccd9a,0xec7dd02d,
0x34867077,0x30476dc0,0x3d044b19,0x39c556ae,
0x278206ab,0x23431b1c,0x2e003dc5,0x2ac12072,
0x128e9dcf,0x164f8078,0x1b0ca6a1,0x1fcdbb16,
0x018aeb13,0x054bf6a4,0x0808d07d,0x0cc9cdca,
0x7897ab07,0x7c56b6b0,0x71159069,0x75d48dde,
0x6b93dddb,0x6f52c06c,0x6211e6b5,0x66d0fb02,
0x5e9f46bf,0x5a5e5b08,0x571d7dd1,0x53dc6066,
0x4d9b3063,0x495a2dd4,0x44190b0d,0x40d816ba,
0xaca5c697,0xa864db20,0xa527fdf9,0xa1e6e04e,
0xbfa1b04b,0xbb60adfc,0xb6238b25,0xb2e29692,
0x8aad2b2f,0x8e6c3698,0x832f1041,0x87ee0df6,
0x99a95df3,0x9d684044,0x902b669d,0x94ea7b2a,
0xe0b41de7,0xe4750050,0xe9362689,0xedf73b3e,
0xf3b06b3b,0xf771768c,0xfa325055,0xfef34de2,
0xc6bcf05f,0xc27dede8,0xcf3ecb31,0xcbffd686,
0xd5b88683,0xd1799b34,0xdc3abded,0xd8fba05a,
0x690ce0ee,0x6dcdfd59,0x608edb80,0x644fc637,
0x7a089632,0x7ec98b85,0x738aad5c,0x774bb0eb,
0x4f040d56,0x4bc510e1,0x46863638,0x42472b8f,
0x5c007b8a,0x58c1663d,0x558240e4,0x51435d53,
0x251d3b9e,0x21dc2629,0x2c9f00f0,0x285e1d47,
0x36194d42,0x32d850f5,0x3f9b762c,0x3b5a6b9b,
0x0315d626,0x07d4cb91,0x0a97ed48,0x0e56f0ff,
0x1011a0fa,0x14d0bd4d,0x19939b94,0x1d528623,
0xf12f560e,0xf5ee4bb9,0xf8ad6d60,0xfc6c70d7,
0xe22b20d2,0xe6ea3d65,0xeba91bbc,0xef68060b,
0xd727bbb6,0xd3e6a601,0xdea580d8,0xda649d6f,
0xc423cd6a,0xc0e2d0dd,0xcda1f604,0xc960ebb3,
0xbd3e8d7e,0xb9ff90c9,0xb4bcb610,0xb07daba7,
0xae3afba2,0xaafbe615,0xa7b8c0cc,0xa379dd7b,
0x9b3660c6,0x9ff77d71,0x92b45ba8,0x9675461f,
0x8832161a,0x8cf30bad,0x81b02d74,0x857130c3,
0x5d8a9099,0x594b8d2e,0x5408abf7,0x50c9b640,
0x4e8ee645,0x4a4ffbf2,0x470cdd2b,0x43cdc09c,
0x7b827d21,0x7f436096,0x7200464f,0x76c15bf8,
0x68860bfd,0x6c47164a,0x61043093,0x65c52d24,
0x119b4be9,0x155a565e,0x18197087,0x1cd86d30,
0x029f3d35,0x065e2082,0x0b1d065b,0x0fdc1bec,
0x3793a651,0x3352bbe6,0x3e119d3f,0x3ad08088,
0x2497d08d,0x2056cd3a,0x2d15ebe3,0x29d4f654,
0xc5a92679,0xc1683bce,0xcc2b1d17,0xc8ea00a0,
0xd6ad50a5,0xd26c4d12,0xdf2f6bcb,0xdbee767c,
0xe3a1cbc1,0xe760d676,0xea23f0af,0xeee2ed18,
0xf0a5bd1d,0xf464a0aa,0xf9278673,0xfde69bc4,
0x89b8fd09,0x8d79e0be,0x803ac667,0x84fbdbd0,
0x9abc8bd5,0x9e7d9662,0x933eb0bb,0x97ffad0c,
0xafb010b1,0xab710d06,0xa6322bdf,0xa2f33668,
0xbcb4666d,0xb8757bda,0xb5365d03,0xb1f740b4 };
/** checksum the page
* Direct table CRC; note that this will be faster in the future if we
perform the checksum simultaneously with other copies */
public final void ogg_page_checksum_set() {
//if( og != null ) {
int crc_reg = 0;// uint32
/* safety; needed for API behavior, but not framing code */
int s = this.header + 22;
final byte[] hdr = this.header_base;
hdr[s++] = 0;
hdr[s++] = 0;
hdr[s++] = 0;
hdr[s] = 0;
s = this.header;
for( int i = 0, len = this.header_len; i < len; i++ ) {
crc_reg = (crc_reg << 8) ^
crc_lookup[((crc_reg >>> 24) & 0xff) ^ (((int)hdr[s++]) & 0xff)];
}
final byte[] buf = this.body_base;// java
s = this.body;
for( int i = 0, len = this.body_len; i < len; i++ ) {
crc_reg = (crc_reg << 8) ^
crc_lookup[((crc_reg >>> 24) & 0xff) ^ (((int)buf[s++]) & 0xff)];
}
s = this.header + 22;
hdr[s++] = (byte)(crc_reg);
hdr[s++] = (byte)(crc_reg >>> 8);
hdr[s++] = (byte)(crc_reg >>> 16);
hdr[s] = (byte)(crc_reg >>> 24);
//}
}
}