media/libtheora/lib/dec/decapiwrapper.c

   1 /********************************************************************
   2  *                                                                  *
   3  * THIS FILE IS PART OF THE OggTheora SOFTWARE CODEC SOURCE CODE.   *
   4  * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS     *
   5  * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
   6  * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING.       *
   7  *                                                                  *
   8  * THE Theora SOURCE CODE IS COPYRIGHT (C) 2002-2007                *
   9  * by the Xiph.Org Foundation http://www.xiph.org/                  *
  10  *                                                                  *
  11  ********************************************************************
  12
  13   function:
  14     last mod: $Id: decapiwrapper.c 13596 2007-08-23 20:05:38Z tterribe $
  15
  16  ********************************************************************/
  17
  18 #include <stdlib.h>
  19 #include <string.h>
  20 #include <limits.h>
  21 #include "apiwrapper.h"
  22 #include "theora/theoradec.h"
  23
  24 static void th_dec_api_clear(th_api_wrapper *_api){
  25   if(_api->setup)th_setup_free(_api->setup);
  26   if(_api->decode)th_decode_free(_api->decode);
  27   memset(_api,0,sizeof(*_api));
  28 }
  29
  30 static void theora_decode_clear(theora_state *_td){
  31   if(_td->i!=NULL)theora_info_clear(_td->i);
  32 #ifdef _TH_DEBUG_
  33   fclose(debugout);
  34   debugout=NULL;
  35 #endif
  36   memset(_td,0,sizeof(*_td));
  37 }
  38
  39 static int theora_decode_control(theora_state *_td,int _req,
  40  void *_buf,size_t _buf_sz){
  41   return th_decode_ctl(((th_api_wrapper *)_td->i->codec_setup)->decode,
  42    _req,_buf,_buf_sz);
  43 }
  44
  45 static ogg_int64_t theora_decode_granule_frame(theora_state *_td,
  46  ogg_int64_t _gp){
  47   return th_granule_frame(((th_api_wrapper *)_td->i->codec_setup)->decode,_gp);
  48 }
  49
  50 static double theora_decode_granule_time(theora_state *_td,ogg_int64_t _gp){
  51   return th_granule_time(((th_api_wrapper *)_td->i->codec_setup)->decode,_gp);
  52 }
  53
  54 static const oc_state_dispatch_vtbl OC_DEC_DISPATCH_VTBL={
  55   (oc_state_clear_func)theora_decode_clear,
  56   (oc_state_control_func)theora_decode_control,
  57   (oc_state_granule_frame_func)theora_decode_granule_frame,
  58   (oc_state_granule_time_func)theora_decode_granule_time,
  59 };
  60
  61 static void th_info2theora_info(theora_info *_ci,const th_info *_info){
  62   _ci->version_major=_info->version_major;
  63   _ci->version_minor=_info->version_minor;
  64   _ci->version_subminor=_info->version_subminor;
  65   _ci->width=_info->frame_width;
  66   _ci->height=_info->frame_height;
  67   _ci->frame_width=_info->pic_width;
  68   _ci->frame_height=_info->pic_height;
  69   _ci->offset_x=_info->pic_x;
  70   _ci->offset_y=_info->pic_y;
  71   _ci->fps_numerator=_info->fps_numerator;
  72   _ci->fps_denominator=_info->fps_denominator;
  73   _ci->aspect_numerator=_info->aspect_numerator;
  74   _ci->aspect_denominator=_info->aspect_denominator;
  75   switch(_info->colorspace){
  76     case TH_CS_ITU_REC_470M:_ci->colorspace=OC_CS_ITU_REC_470M;break;
  77     case TH_CS_ITU_REC_470BG:_ci->colorspace=OC_CS_ITU_REC_470BG;break;
  78     default:_ci->colorspace=OC_CS_UNSPECIFIED;break;
  79   }
  80   switch(_info->pixel_fmt){
  81     case TH_PF_420:_ci->pixelformat=OC_PF_420;break;
  82     case TH_PF_422:_ci->pixelformat=OC_PF_422;break;
  83     case TH_PF_444:_ci->pixelformat=OC_PF_444;break;
  84     default:_ci->pixelformat=OC_PF_RSVD;
  85   }
  86   _ci->target_bitrate=_info->target_bitrate;
  87   _ci->quality=_info->quality;
  88   _ci->keyframe_frequency_force=1<<_info->keyframe_granule_shift;
  89 }
  90
  91 int theora_decode_init(theora_state *_td,theora_info *_ci){
  92   th_api_info    *apiinfo;
  93   th_api_wrapper *api;
  94   th_info         info;
  95
  96   api=(th_api_wrapper *)_ci->codec_setup;
  97   /*Allocate our own combined API wrapper/theora_info struct.
  98     We put them both in one malloc'd block so that when the API wrapper is
  99      freed, the info struct goes with it.
 100     This avoids having to figure out whether or not we need to free the info
 101      struct in either theora_info_clear() or theora_clear().*/
 102   apiinfo=(th_api_info *)_ogg_calloc(1,sizeof(*apiinfo));
 103   /*Make our own copy of the info struct, since its lifetime should be
 104      independent of the one we were passed in.*/
 105   *&apiinfo->info=*_ci;
 106   /*Convert the info struct now instead of saving the the one we decoded with
 107      theora_decode_header(), since the user might have modified values (i.e.,
 108      color space, aspect ratio, etc. can be specified from a higher level).
 109     The user also might be doing something "clever" with the header packets if
 110      they are not using an Ogg encapsulation.*/
 111   oc_theora_info2th_info(&info,_ci);
 112   /*Don't bother to copy the setup info; th_decode_alloc() makes its own copy
 113      of the stuff it needs.*/
 114   apiinfo->api.decode=th_decode_alloc(&info,api->setup);
 115   if(apiinfo->api.decode==NULL){
 116     _ogg_free(apiinfo);
 117     return OC_EINVAL;
 118   }
 119   apiinfo->api.clear=(oc_setup_clear_func)th_dec_api_clear;
 120   _td->internal_encode=NULL;
 121   /*Provide entry points for ABI compatibility with old decoder shared libs.*/
 122   _td->internal_decode=(void *)&OC_DEC_DISPATCH_VTBL;
 123   _td->granulepos=0;
 124   _td->i=&apiinfo->info;
 125   _td->i->codec_setup=&apiinfo->api;
 126   return 0;
 127 }
 128
 129 int theora_decode_header(theora_info *_ci,theora_comment *_cc,ogg_packet *_op){
 130   th_api_wrapper *api;
 131   th_info         info;
 132   int             ret;
 133
 134 #ifdef _TH_DEBUG_
 135   debugout = fopen("theoradec-debugout.txt","w");
 136 #endif
 137
 138   api=(th_api_wrapper *)_ci->codec_setup;
 139   /*Allocate an API wrapper struct on demand, since it will not also include a
 140      theora_info struct like the ones that are used in a theora_state struct.*/
 141   if(api==NULL){
 142     _ci->codec_setup=_ogg_calloc(1,sizeof(*api));
 143     api=(th_api_wrapper *)_ci->codec_setup;
 144     api->clear=(oc_setup_clear_func)th_dec_api_clear;
 145   }
 146   /*Convert from the theora_info struct instead of saving our own th_info
 147      struct between calls.
 148     The user might be doing something "clever" with the header packets if they
 149      are not using an Ogg encapsulation, and we don't want to break this.*/
 150   oc_theora_info2th_info(&info,_ci);
 151   /*We rely on the fact that theora_comment and th_comment structures are
 152      actually identical.
 153     Take care not to change this fact unless you change the code here as
 154      well!*/
 155   ret=th_decode_headerin(&info,(th_comment *)_cc,&api->setup,_op);
 156   /*We also rely on the fact that the error return code values are the same,
 157     and that the implementations of these two functions return the same set of
 158     them.
 159    Note that theora_decode_header() really can return OC_NOTFORMAT, even
 160     though it is not currently documented to do so.*/
 161   if(ret<0)return ret;
 162   th_info2theora_info(_ci,&info);
 163   return 0;
 164 }
 165
 166 int theora_decode_packetin(theora_state *_td,ogg_packet *_op){
 167   th_api_wrapper *api;
 168   ogg_int64_t     gp;
 169   int             ret;
 170
 171   if(!_td || !_td->i || !_td->i->codec_setup)return OC_FAULT;
 172   api=(th_api_wrapper *)_td->i->codec_setup;
 173   if(!api || !api->decode)return OC_FAULT;
 174   ret=th_decode_packetin(api->decode,_op,&gp);
 175
 176 #ifdef _TH_DEBUG_
 177   dframe++;
 178 #endif
 179
 180   if(ret<0)return OC_BADPACKET;
 181   _td->granulepos=gp;
 182   return 0;
 183 }
 184
 185 int theora_decode_YUVout(theora_state *_td,yuv_buffer *_yuv){
 186   th_api_wrapper  *api;
 187   th_ycbcr_buffer  buf;
 188   int              ret;
 189
 190   if(!_td || !_td->i || !_td->i->codec_setup)return OC_FAULT;
 191   api=(th_api_wrapper *)_td->i->codec_setup;
 192   if(!api || !api->decode)return OC_FAULT;
 193   ret=th_decode_ycbcr_out(api->decode,buf);
 194   if(ret>=0){
 195     _yuv->y_width=buf[0].width;
 196     _yuv->y_height=buf[0].height;
 197     _yuv->y_stride=buf[0].stride;
 198     _yuv->uv_width=buf[1].width;
 199     _yuv->uv_height=buf[1].height;
 200     _yuv->uv_stride=buf[1].stride;
 201     _yuv->y=buf[0].data;
 202     _yuv->u=buf[1].data;
 203     _yuv->v=buf[2].data;
 204   }
 205
 206   return ret;
 207 }