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+/********************************************************************
+ * *
+ * THIS FILE IS PART OF THE OggTheora SOFTWARE CODEC SOURCE CODE. *
+ * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS *
+ * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
+ * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
+ * *
+ * THE Theora SOURCE CODE IS COPYRIGHT (C) 2002-2009 *
+ * by the Xiph.Org Foundation and contributors http://www.xiph.org/ *
+ * *
+ ********************************************************************
+
+ function:
+ last mod: $Id$
+
+ ********************************************************************/
+
+#include <stdlib.h>
+#include <limits.h>
+#include <string.h>
+#include "internal.h"
+
+
+
+/*A map from the index in the zig zag scan to the coefficient number in a
+ block.
+ All zig zag indices beyond 63 are sent to coefficient 64, so that zero runs
+ past the end of a block in bogus streams get mapped to a known location.*/
+const unsigned char OC_FZIG_ZAG[128]={
+ 0, 1, 8,16, 9, 2, 3,10,
+ 17,24,32,25,18,11, 4, 5,
+ 12,19,26,33,40,48,41,34,
+ 27,20,13, 6, 7,14,21,28,
+ 35,42,49,56,57,50,43,36,
+ 29,22,15,23,30,37,44,51,
+ 58,59,52,45,38,31,39,46,
+ 53,60,61,54,47,55,62,63,
+ 64,64,64,64,64,64,64,64,
+ 64,64,64,64,64,64,64,64,
+ 64,64,64,64,64,64,64,64,
+ 64,64,64,64,64,64,64,64,
+ 64,64,64,64,64,64,64,64,
+ 64,64,64,64,64,64,64,64,
+ 64,64,64,64,64,64,64,64,
+ 64,64,64,64,64,64,64,64
+};
+
+/*A map from the coefficient number in a block to its index in the zig zag
+ scan.*/
+const unsigned char OC_IZIG_ZAG[64]={
+ 0, 1, 5, 6,14,15,27,28,
+ 2, 4, 7,13,16,26,29,42,
+ 3, 8,12,17,25,30,41,43,
+ 9,11,18,24,31,40,44,53,
+ 10,19,23,32,39,45,52,54,
+ 20,22,33,38,46,51,55,60,
+ 21,34,37,47,50,56,59,61,
+ 35,36,48,49,57,58,62,63
+};
+
+/*A map from physical macro block ordering to bitstream macro block
+ ordering within a super block.*/
+const unsigned char OC_MB_MAP[2][2]={{0,3},{1,2}};
+
+/*A list of the indices in the oc_mb.map array that can be valid for each of
+ the various chroma decimation types.*/
+const unsigned char OC_MB_MAP_IDXS[TH_PF_NFORMATS][12]={
+ {0,1,2,3,4,8},
+ {0,1,2,3,4,5,8,9},
+ {0,1,2,3,4,6,8,10},
+ {0,1,2,3,4,5,6,7,8,9,10,11}
+};
+
+/*The number of indices in the oc_mb.map array that can be valid for each of
+ the various chroma decimation types.*/
+const unsigned char OC_MB_MAP_NIDXS[TH_PF_NFORMATS]={6,8,8,12};
+
+/*The number of extra bits that are coded with each of the DCT tokens.
+ Each DCT token has some fixed number of additional bits (possibly 0) stored
+ after the token itself, containing, for example, coefficient magnitude,
+ sign bits, etc.*/
+const unsigned char OC_DCT_TOKEN_EXTRA_BITS[TH_NDCT_TOKENS]={
+ 0,0,0,2,3,4,12,3,6,
+ 0,0,0,0,
+ 1,1,1,1,2,3,4,5,6,10,
+ 1,1,1,1,1,3,4,
+ 2,3
+};
+
+
+
+int oc_ilog(unsigned _v){
+ int ret;
+ for(ret=0;_v;ret++)_v>>=1;
+ return ret;
+}
+
+
+
+void *oc_aligned_malloc(size_t _sz,size_t _align){
+ unsigned char *p;
+ if(_align-1>UCHAR_MAX||(_align&_align-1)||_sz>~(size_t)0-_align)return NULL;
+ p=(unsigned char *)_ogg_malloc(_sz+_align);
+ if(p!=NULL){
+ int offs;
+ offs=((p-(unsigned char *)0)-1&_align-1);
+ p[offs]=offs;
+ p+=offs+1;
+ }
+ return p;
+}
+
+void oc_aligned_free(void *_ptr){
+ unsigned char *p;
+ p=(unsigned char *)_ptr;
+ if(p!=NULL){
+ int offs;
+ offs=*--p;
+ _ogg_free(p-offs);
+ }
+}
+
+
+void **oc_malloc_2d(size_t _height,size_t _width,size_t _sz){
+ size_t rowsz;
+ size_t colsz;
+ size_t datsz;
+ char *ret;
+ colsz=_height*sizeof(void *);
+ rowsz=_sz*_width;
+ datsz=rowsz*_height;
+ /*Alloc array and row pointers.*/
+ ret=(char *)_ogg_malloc(datsz+colsz);
+ /*Initialize the array.*/
+ if(ret!=NULL){
+ size_t i;
+ void **p;
+ char *datptr;
+ p=(void **)ret;
+ i=_height;
+ for(datptr=ret+colsz;i-->0;p++,datptr+=rowsz)*p=(void *)datptr;
+ }
+ return (void **)ret;
+}
+
+void **oc_calloc_2d(size_t _height,size_t _width,size_t _sz){
+ size_t colsz;
+ size_t rowsz;
+ size_t datsz;
+ char *ret;
+ colsz=_height*sizeof(void *);
+ rowsz=_sz*_width;
+ datsz=rowsz*_height;
+ /*Alloc array and row pointers.*/
+ ret=(char *)_ogg_calloc(datsz+colsz,1);
+ /*Initialize the array.*/
+ if(ret!=NULL){
+ size_t i;
+ void **p;
+ char *datptr;
+ p=(void **)ret;
+ i=_height;
+ for(datptr=ret+colsz;i-->0;p++,datptr+=rowsz)*p=(void *)datptr;
+ }
+ return (void **)ret;
+}
+
+void oc_free_2d(void *_ptr){
+ _ogg_free(_ptr);
+}
+
+/*Fills in a Y'CbCr buffer with a pointer to the image data in the first
+ buffer, but with the opposite vertical orientation.
+ _dst: The destination buffer.
+ This can be the same as _src.
+ _src: The source buffer.*/
+void oc_ycbcr_buffer_flip(th_ycbcr_buffer _dst,
+ const th_ycbcr_buffer _src){
+ int pli;
+ for(pli=0;pli<3;pli++){
+ _dst[pli].width=_src[pli].width;
+ _dst[pli].height=_src[pli].height;
+ _dst[pli].stride=-_src[pli].stride;
+ _dst[pli].data=_src[pli].data
+ +(1-_dst[pli].height)*(ptrdiff_t)_dst[pli].stride;
+ }
+}
+
+const char *th_version_string(void){
+ return OC_VENDOR_STRING;
+}
+
+ogg_uint32_t th_version_number(void){
+ return (TH_VERSION_MAJOR<<16)+(TH_VERSION_MINOR<<8)+TH_VERSION_SUB;
+}
+
+/*Determines the packet type.
+ Note that this correctly interprets a 0-byte packet as a video data packet.
+ Return: 1 for a header packet, 0 for a data packet.*/
+int th_packet_isheader(ogg_packet *_op){
+ return _op->bytes>0?_op->packet[0]>>7:0;
+}
+
+/*Determines the frame type of a video data packet.
+ Note that this correctly interprets a 0-byte packet as a delta frame.
+ Return: 1 for a key frame, 0 for a delta frame, and -1 for a header
+ packet.*/
+int th_packet_iskeyframe(ogg_packet *_op){
+ return _op->bytes<=0?0:_op->packet[0]&0x80?-1:!(_op->packet[0]&0x40);
+}