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Diffstat (limited to 'media/libtheora/lib/decapiwrapper.c')
-rw-r--r--media/libtheora/lib/decapiwrapper.c193
1 files changed, 193 insertions, 0 deletions
diff --git a/media/libtheora/lib/decapiwrapper.c b/media/libtheora/lib/decapiwrapper.c
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+++ b/media/libtheora/lib/decapiwrapper.c
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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: decapiwrapper.c 13596 2007-08-23 20:05:38Z tterribe $
+
+ ********************************************************************/
+
+#include <stdlib.h>
+#include <string.h>
+#include <limits.h>
+#include "apiwrapper.h"
+#include "decint.h"
+#include "theora/theoradec.h"
+
+static void th_dec_api_clear(th_api_wrapper *_api){
+ if(_api->setup)th_setup_free(_api->setup);
+ if(_api->decode)th_decode_free(_api->decode);
+ memset(_api,0,sizeof(*_api));
+}
+
+static void theora_decode_clear(theora_state *_td){
+ if(_td->i!=NULL)theora_info_clear(_td->i);
+ memset(_td,0,sizeof(*_td));
+}
+
+static int theora_decode_control(theora_state *_td,int _req,
+ void *_buf,size_t _buf_sz){
+ return th_decode_ctl(((th_api_wrapper *)_td->i->codec_setup)->decode,
+ _req,_buf,_buf_sz);
+}
+
+static ogg_int64_t theora_decode_granule_frame(theora_state *_td,
+ ogg_int64_t _gp){
+ return th_granule_frame(((th_api_wrapper *)_td->i->codec_setup)->decode,_gp);
+}
+
+static double theora_decode_granule_time(theora_state *_td,ogg_int64_t _gp){
+ return th_granule_time(((th_api_wrapper *)_td->i->codec_setup)->decode,_gp);
+}
+
+static const oc_state_dispatch_vtable OC_DEC_DISPATCH_VTBL={
+ (oc_state_clear_func)theora_decode_clear,
+ (oc_state_control_func)theora_decode_control,
+ (oc_state_granule_frame_func)theora_decode_granule_frame,
+ (oc_state_granule_time_func)theora_decode_granule_time,
+};
+
+static void th_info2theora_info(theora_info *_ci,const th_info *_info){
+ _ci->version_major=_info->version_major;
+ _ci->version_minor=_info->version_minor;
+ _ci->version_subminor=_info->version_subminor;
+ _ci->width=_info->frame_width;
+ _ci->height=_info->frame_height;
+ _ci->frame_width=_info->pic_width;
+ _ci->frame_height=_info->pic_height;
+ _ci->offset_x=_info->pic_x;
+ _ci->offset_y=_info->pic_y;
+ _ci->fps_numerator=_info->fps_numerator;
+ _ci->fps_denominator=_info->fps_denominator;
+ _ci->aspect_numerator=_info->aspect_numerator;
+ _ci->aspect_denominator=_info->aspect_denominator;
+ switch(_info->colorspace){
+ case TH_CS_ITU_REC_470M:_ci->colorspace=OC_CS_ITU_REC_470M;break;
+ case TH_CS_ITU_REC_470BG:_ci->colorspace=OC_CS_ITU_REC_470BG;break;
+ default:_ci->colorspace=OC_CS_UNSPECIFIED;break;
+ }
+ switch(_info->pixel_fmt){
+ case TH_PF_420:_ci->pixelformat=OC_PF_420;break;
+ case TH_PF_422:_ci->pixelformat=OC_PF_422;break;
+ case TH_PF_444:_ci->pixelformat=OC_PF_444;break;
+ default:_ci->pixelformat=OC_PF_RSVD;
+ }
+ _ci->target_bitrate=_info->target_bitrate;
+ _ci->quality=_info->quality;
+ _ci->keyframe_frequency_force=1<<_info->keyframe_granule_shift;
+}
+
+int theora_decode_init(theora_state *_td,theora_info *_ci){
+ th_api_info *apiinfo;
+ th_api_wrapper *api;
+ th_info info;
+ api=(th_api_wrapper *)_ci->codec_setup;
+ /*Allocate our own combined API wrapper/theora_info struct.
+ We put them both in one malloc'd block so that when the API wrapper is
+ freed, the info struct goes with it.
+ This avoids having to figure out whether or not we need to free the info
+ struct in either theora_info_clear() or theora_clear().*/
+ apiinfo=(th_api_info *)_ogg_calloc(1,sizeof(*apiinfo));
+ if(apiinfo==NULL)return OC_FAULT;
+ /*Make our own copy of the info struct, since its lifetime should be
+ independent of the one we were passed in.*/
+ *&apiinfo->info=*_ci;
+ /*Convert the info struct now instead of saving the the one we decoded with
+ theora_decode_header(), since the user might have modified values (i.e.,
+ color space, aspect ratio, etc. can be specified from a higher level).
+ The user also might be doing something "clever" with the header packets if
+ they are not using an Ogg encapsulation.*/
+ oc_theora_info2th_info(&info,_ci);
+ /*Don't bother to copy the setup info; th_decode_alloc() makes its own copy
+ of the stuff it needs.*/
+ apiinfo->api.decode=th_decode_alloc(&info,api->setup);
+ if(apiinfo->api.decode==NULL){
+ _ogg_free(apiinfo);
+ return OC_EINVAL;
+ }
+ apiinfo->api.clear=(oc_setup_clear_func)th_dec_api_clear;
+ _td->internal_encode=NULL;
+ /*Provide entry points for ABI compatibility with old decoder shared libs.*/
+ _td->internal_decode=(void *)&OC_DEC_DISPATCH_VTBL;
+ _td->granulepos=0;
+ _td->i=&apiinfo->info;
+ _td->i->codec_setup=&apiinfo->api;
+ return 0;
+}
+
+int theora_decode_header(theora_info *_ci,theora_comment *_cc,ogg_packet *_op){
+ th_api_wrapper *api;
+ th_info info;
+ int ret;
+ api=(th_api_wrapper *)_ci->codec_setup;
+ /*Allocate an API wrapper struct on demand, since it will not also include a
+ theora_info struct like the ones that are used in a theora_state struct.*/
+ if(api==NULL){
+ _ci->codec_setup=_ogg_calloc(1,sizeof(*api));
+ if(_ci->codec_setup==NULL)return OC_FAULT;
+ api=(th_api_wrapper *)_ci->codec_setup;
+ api->clear=(oc_setup_clear_func)th_dec_api_clear;
+ }
+ /*Convert from the theora_info struct instead of saving our own th_info
+ struct between calls.
+ The user might be doing something "clever" with the header packets if they
+ are not using an Ogg encapsulation, and we don't want to break this.*/
+ oc_theora_info2th_info(&info,_ci);
+ /*We rely on the fact that theora_comment and th_comment structures are
+ actually identical.
+ Take care not to change this fact unless you change the code here as
+ well!*/
+ ret=th_decode_headerin(&info,(th_comment *)_cc,&api->setup,_op);
+ /*We also rely on the fact that the error return code values are the same,
+ and that the implementations of these two functions return the same set of
+ them.
+ Note that theora_decode_header() really can return OC_NOTFORMAT, even
+ though it is not currently documented to do so.*/
+ if(ret<0)return ret;
+ th_info2theora_info(_ci,&info);
+ return 0;
+}
+
+int theora_decode_packetin(theora_state *_td,ogg_packet *_op){
+ th_api_wrapper *api;
+ ogg_int64_t gp;
+ int ret;
+ if(!_td||!_td->i||!_td->i->codec_setup)return OC_FAULT;
+ api=(th_api_wrapper *)_td->i->codec_setup;
+ ret=th_decode_packetin(api->decode,_op,&gp);
+ if(ret<0)return OC_BADPACKET;
+ _td->granulepos=gp;
+ return 0;
+}
+
+int theora_decode_YUVout(theora_state *_td,yuv_buffer *_yuv){
+ th_api_wrapper *api;
+ th_dec_ctx *decode;
+ th_ycbcr_buffer buf;
+ int ret;
+ if(!_td||!_td->i||!_td->i->codec_setup)return OC_FAULT;
+ api=(th_api_wrapper *)_td->i->codec_setup;
+ decode=(th_dec_ctx *)api->decode;
+ if(!decode)return OC_FAULT;
+ ret=th_decode_ycbcr_out(decode,buf);
+ if(ret>=0){
+ _yuv->y_width=buf[0].width;
+ _yuv->y_height=buf[0].height;
+ _yuv->y_stride=buf[0].stride;
+ _yuv->uv_width=buf[1].width;
+ _yuv->uv_height=buf[1].height;
+ _yuv->uv_stride=buf[1].stride;
+ _yuv->y=buf[0].data;
+ _yuv->u=buf[1].data;
+ _yuv->v=buf[2].data;
+ }
+ return ret;
+}
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