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Diffstat (limited to 'media/libtheora/lib/internal.c')
| -rw-r--r-- | media/libtheora/lib/internal.c | 210 |
1 files changed, 210 insertions, 0 deletions
diff --git a/media/libtheora/lib/internal.c b/media/libtheora/lib/internal.c new file mode 100644 index 0000000000..afbb6efae7 --- /dev/null +++ b/media/libtheora/lib/internal.c @@ -0,0 +1,210 @@ +/******************************************************************** + * * + * 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); +} |