263 lines
8.6 KiB
C
263 lines
8.6 KiB
C
/********************************************************************
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* *
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* THIS FILE IS PART OF THE OggTheora SOFTWARE CODEC SOURCE CODE. *
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* USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS *
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* GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
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* IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
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* *
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* THE Theora SOURCE CODE IS COPYRIGHT (C) 2002-2009 *
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* by the Xiph.Org Foundation and contributors http://www.xiph.org/ *
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* *
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********************************************************************
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function:
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last mod: $Id: internal.c 16503 2009-08-22 18:14:02Z giles $
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********************************************************************/
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#include <stdlib.h>
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#include <limits.h>
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#include <string.h>
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#include "internal.h"
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/*A map from the index in the zig zag scan to the coefficient number in a
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block.
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All zig zag indices beyond 63 are sent to coefficient 64, so that zero runs
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past the end of a block in bogus streams get mapped to a known location.*/
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const unsigned char OC_FZIG_ZAG[128]={
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0, 1, 8,16, 9, 2, 3,10,
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17,24,32,25,18,11, 4, 5,
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12,19,26,33,40,48,41,34,
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27,20,13, 6, 7,14,21,28,
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35,42,49,56,57,50,43,36,
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29,22,15,23,30,37,44,51,
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58,59,52,45,38,31,39,46,
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53,60,61,54,47,55,62,63,
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64,64,64,64,64,64,64,64,
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64,64,64,64,64,64,64,64,
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64,64,64,64,64,64,64,64,
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64,64,64,64,64,64,64,64,
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64,64,64,64,64,64,64,64,
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64,64,64,64,64,64,64,64,
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64,64,64,64,64,64,64,64,
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64,64,64,64,64,64,64,64
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};
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/*A map from the coefficient number in a block to its index in the zig zag
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scan.*/
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const unsigned char OC_IZIG_ZAG[64]={
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0, 1, 5, 6,14,15,27,28,
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2, 4, 7,13,16,26,29,42,
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3, 8,12,17,25,30,41,43,
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9,11,18,24,31,40,44,53,
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10,19,23,32,39,45,52,54,
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20,22,33,38,46,51,55,60,
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21,34,37,47,50,56,59,61,
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35,36,48,49,57,58,62,63
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};
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/*A map from physical macro block ordering to bitstream macro block
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ordering within a super block.*/
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const unsigned char OC_MB_MAP[2][2]={{0,3},{1,2}};
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/*A list of the indices in the oc_mb.map array that can be valid for each of
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the various chroma decimation types.*/
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const unsigned char OC_MB_MAP_IDXS[TH_PF_NFORMATS][12]={
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{0,1,2,3,4,8},
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{0,1,2,3,4,5,8,9},
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{0,1,2,3,4,6,8,10},
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{0,1,2,3,4,5,6,7,8,9,10,11}
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};
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/*The number of indices in the oc_mb.map array that can be valid for each of
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the various chroma decimation types.*/
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const unsigned char OC_MB_MAP_NIDXS[TH_PF_NFORMATS]={6,8,8,12};
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/*The number of extra bits that are coded with each of the DCT tokens.
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Each DCT token has some fixed number of additional bits (possibly 0) stored
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after the token itself, containing, for example, coefficient magnitude,
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sign bits, etc.*/
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const unsigned char OC_DCT_TOKEN_EXTRA_BITS[TH_NDCT_TOKENS]={
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0,0,0,2,3,4,12,3,6,
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0,0,0,0,
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1,1,1,1,2,3,4,5,6,10,
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1,1,1,1,1,3,4,
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2,3
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};
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int oc_ilog(unsigned _v){
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int ret;
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for(ret=0;_v;ret++)_v>>=1;
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return ret;
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}
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/*The function used to fill in the chroma plane motion vectors for a macro
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block when 4 different motion vectors are specified in the luma plane.
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This version is for use with chroma decimated in the X and Y directions
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(4:2:0).
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_cbmvs: The chroma block-level motion vectors to fill in.
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_lbmvs: The luma block-level motion vectors.*/
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static void oc_set_chroma_mvs00(oc_mv _cbmvs[4],const oc_mv _lbmvs[4]){
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int dx;
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int dy;
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dx=_lbmvs[0][0]+_lbmvs[1][0]+_lbmvs[2][0]+_lbmvs[3][0];
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dy=_lbmvs[0][1]+_lbmvs[1][1]+_lbmvs[2][1]+_lbmvs[3][1];
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_cbmvs[0][0]=(signed char)OC_DIV_ROUND_POW2(dx,2,2);
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_cbmvs[0][1]=(signed char)OC_DIV_ROUND_POW2(dy,2,2);
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}
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/*The function used to fill in the chroma plane motion vectors for a macro
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block when 4 different motion vectors are specified in the luma plane.
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This version is for use with chroma decimated in the Y direction.
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_cbmvs: The chroma block-level motion vectors to fill in.
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_lbmvs: The luma block-level motion vectors.*/
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static void oc_set_chroma_mvs01(oc_mv _cbmvs[4],const oc_mv _lbmvs[4]){
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int dx;
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int dy;
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dx=_lbmvs[0][0]+_lbmvs[2][0];
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dy=_lbmvs[0][1]+_lbmvs[2][1];
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_cbmvs[0][0]=(signed char)OC_DIV_ROUND_POW2(dx,1,1);
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_cbmvs[0][1]=(signed char)OC_DIV_ROUND_POW2(dy,1,1);
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dx=_lbmvs[1][0]+_lbmvs[3][0];
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dy=_lbmvs[1][1]+_lbmvs[3][1];
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_cbmvs[1][0]=(signed char)OC_DIV_ROUND_POW2(dx,1,1);
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_cbmvs[1][1]=(signed char)OC_DIV_ROUND_POW2(dy,1,1);
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}
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/*The function used to fill in the chroma plane motion vectors for a macro
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block when 4 different motion vectors are specified in the luma plane.
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This version is for use with chroma decimated in the X direction (4:2:2).
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_cbmvs: The chroma block-level motion vectors to fill in.
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_lbmvs: The luma block-level motion vectors.*/
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static void oc_set_chroma_mvs10(oc_mv _cbmvs[4],const oc_mv _lbmvs[4]){
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int dx;
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int dy;
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dx=_lbmvs[0][0]+_lbmvs[1][0];
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dy=_lbmvs[0][1]+_lbmvs[1][1];
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_cbmvs[0][0]=(signed char)OC_DIV_ROUND_POW2(dx,1,1);
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_cbmvs[0][1]=(signed char)OC_DIV_ROUND_POW2(dy,1,1);
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dx=_lbmvs[2][0]+_lbmvs[3][0];
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dy=_lbmvs[2][1]+_lbmvs[3][1];
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_cbmvs[2][0]=(signed char)OC_DIV_ROUND_POW2(dx,1,1);
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_cbmvs[2][1]=(signed char)OC_DIV_ROUND_POW2(dy,1,1);
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}
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/*The function used to fill in the chroma plane motion vectors for a macro
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block when 4 different motion vectors are specified in the luma plane.
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This version is for use with no chroma decimation (4:4:4).
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_cbmvs: The chroma block-level motion vectors to fill in.
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_lmbmv: The luma macro-block level motion vector to fill in for use in
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prediction.
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_lbmvs: The luma block-level motion vectors.*/
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static void oc_set_chroma_mvs11(oc_mv _cbmvs[4],const oc_mv _lbmvs[4]){
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memcpy(_cbmvs,_lbmvs,4*sizeof(_lbmvs[0]));
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}
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/*A table of functions used to fill in the chroma plane motion vectors for a
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macro block when 4 different motion vectors are specified in the luma
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plane.*/
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const oc_set_chroma_mvs_func OC_SET_CHROMA_MVS_TABLE[TH_PF_NFORMATS]={
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(oc_set_chroma_mvs_func)oc_set_chroma_mvs00,
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(oc_set_chroma_mvs_func)oc_set_chroma_mvs01,
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(oc_set_chroma_mvs_func)oc_set_chroma_mvs10,
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(oc_set_chroma_mvs_func)oc_set_chroma_mvs11
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};
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void **oc_malloc_2d(size_t _height,size_t _width,size_t _sz){
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size_t rowsz;
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size_t colsz;
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size_t datsz;
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char *ret;
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colsz=_height*sizeof(void *);
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rowsz=_sz*_width;
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datsz=rowsz*_height;
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/*Alloc array and row pointers.*/
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ret=(char *)_ogg_malloc(datsz+colsz);
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if(ret==NULL)return NULL;
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/*Initialize the array.*/
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if(ret!=NULL){
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size_t i;
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void **p;
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char *datptr;
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p=(void **)ret;
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i=_height;
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for(datptr=ret+colsz;i-->0;p++,datptr+=rowsz)*p=(void *)datptr;
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}
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return (void **)ret;
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}
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void **oc_calloc_2d(size_t _height,size_t _width,size_t _sz){
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size_t colsz;
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size_t rowsz;
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size_t datsz;
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char *ret;
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colsz=_height*sizeof(void *);
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rowsz=_sz*_width;
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datsz=rowsz*_height;
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/*Alloc array and row pointers.*/
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ret=(char *)_ogg_calloc(datsz+colsz,1);
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if(ret==NULL)return NULL;
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/*Initialize the array.*/
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if(ret!=NULL){
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size_t i;
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void **p;
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char *datptr;
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p=(void **)ret;
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i=_height;
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for(datptr=ret+colsz;i-->0;p++,datptr+=rowsz)*p=(void *)datptr;
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}
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return (void **)ret;
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}
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void oc_free_2d(void *_ptr){
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_ogg_free(_ptr);
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}
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/*Fills in a Y'CbCr buffer with a pointer to the image data in the first
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buffer, but with the opposite vertical orientation.
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_dst: The destination buffer.
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This can be the same as _src.
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_src: The source buffer.*/
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void oc_ycbcr_buffer_flip(th_ycbcr_buffer _dst,
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const th_ycbcr_buffer _src){
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int pli;
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for(pli=0;pli<3;pli++){
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_dst[pli].width=_src[pli].width;
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_dst[pli].height=_src[pli].height;
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_dst[pli].stride=-_src[pli].stride;
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_dst[pli].data=_src[pli].data
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+(1-_dst[pli].height)*(ptrdiff_t)_dst[pli].stride;
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}
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}
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const char *th_version_string(void){
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return OC_VENDOR_STRING;
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}
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ogg_uint32_t th_version_number(void){
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return (TH_VERSION_MAJOR<<16)+(TH_VERSION_MINOR<<8)+TH_VERSION_SUB;
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}
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/*Determines the packet type.
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Note that this correctly interprets a 0-byte packet as a video data packet.
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Return: 1 for a header packet, 0 for a data packet.*/
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int th_packet_isheader(ogg_packet *_op){
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return _op->bytes>0?_op->packet[0]>>7:0;
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}
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/*Determines the frame type of a video data packet.
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Note that this correctly interprets a 0-byte packet as a delta frame.
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Return: 1 for a key frame, 0 for a delta frame, and -1 for a header
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packet.*/
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int th_packet_iskeyframe(ogg_packet *_op){
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return _op->bytes<=0?0:_op->packet[0]&0x80?-1:!(_op->packet[0]&0x40);
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}
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