void InitPBInstance(PB_INSTANCE *pbi){
/* initialize whole structure to 0 */
memset(pbi, 0, sizeof(*pbi));
InitTmpBuffers(pbi);
/* allocate memory for the oggpack_buffer */
#ifndef LIBOGG2
pbi->opb = _ogg_malloc(sizeof(oggpack_buffer));
#else
pbi->opb = _ogg_malloc(oggpack_buffersize());
#endif
/* variables needing initialization (not being set to 0) */
pbi->ModifierPointer[0] = &pbi->Modifier[0][255];
pbi->ModifierPointer[1] = &pbi->Modifier[1][255];
pbi->ModifierPointer[2] = &pbi->Modifier[2][255];
pbi->ModifierPointer[3] = &pbi->Modifier[3][255];
pbi->DecoderErrorCode = 0;
pbi->KeyFrameType = DCT_KEY_FRAME;
pbi->FramesHaveBeenSkipped = 0;
}
int theora_encode_init(theora_state *th, theora_info *c){
int i;
CP_INSTANCE *cpi;
memset(th, 0, sizeof(*th));
/*Currently only the 4:2:0 format is supported.*/
if(c->pixelformat!=OC_PF_420)return OC_IMPL;
th->internal_encode=cpi=_ogg_calloc(1,sizeof(*cpi));
dsp_static_init (&cpi->dsp);
memcpy (&cpi->pb.dsp, &cpi->dsp, sizeof(DspFunctions));
c->version_major=VERSION_MAJOR;
c->version_minor=VERSION_MINOR;
c->version_subminor=VERSION_SUB;
InitTmpBuffers(&cpi->pb);
InitPPInstance(&cpi->pp, &cpi->dsp);
/* Initialise Configuration structure to legal values */
if(c->quality>63)c->quality=63;
if(c->quality<0)c->quality=32;
if(c->target_bitrate<0)c->target_bitrate=0;
/* we clamp target_bitrate to 24 bits after setting up the encoder */
cpi->Configuration.BaseQ = c->quality;
cpi->Configuration.FirstFrameQ = c->quality;
cpi->Configuration.MaxQ = c->quality;
cpi->Configuration.ActiveMaxQ = c->quality;
cpi->MVChangeFactor = 14;
cpi->FourMvChangeFactor = 8;
cpi->MinImprovementForNewMV = 25;
cpi->ExhaustiveSearchThresh = 2500;
cpi->MinImprovementForFourMV = 100;
cpi->FourMVThreshold = 10000;
cpi->BitRateCapFactor = 1.50;
cpi->InterTripOutThresh = 5000;
cpi->MVEnabled = 1;
cpi->InterCodeCount = 127;
cpi->BpbCorrectionFactor = 1.0;
cpi->GoldenFrameEnabled = 1;
cpi->InterPrediction = 1;
cpi->MotionCompensation = 1;
cpi->ThreshMapThreshold = 5;
cpi->MaxConsDroppedFrames = 1;
/* Set encoder flags. */
/* if not AutoKeyframing cpi->ForceKeyFrameEvery = is frequency */
if(!c->keyframe_auto_p)
c->keyframe_frequency_force = c->keyframe_frequency;
/* Set the frame rate variables. */
if ( c->fps_numerator < 1 )
c->fps_numerator = 1;
if ( c->fps_denominator < 1 )
c->fps_denominator = 1;
/* don't go too nuts on keyframe spacing; impose a high limit to
make certain the granulepos encoding strategy works */
if(c->keyframe_frequency_force>32768)c->keyframe_frequency_force=32768;
if(c->keyframe_mindistance>32768)c->keyframe_mindistance=32768;
if(c->keyframe_mindistance>c->keyframe_frequency_force)
c->keyframe_mindistance=c->keyframe_frequency_force;
cpi->pb.keyframe_granule_shift=_ilog(c->keyframe_frequency_force-1);
/* clamp the target_bitrate to a maximum of 24 bits so we get a
more meaningful value when we write this out in the header. */
if(c->target_bitrate>(1<<24)-1)c->target_bitrate=(1<<24)-1;
/* copy in config */
memcpy(&cpi->pb.info,c,sizeof(*c));
th->i=&cpi->pb.info;
th->granulepos=-1;
/* Set up default values for QTargetModifier[Q_TABLE_SIZE] table */
for ( i = 0; i < Q_TABLE_SIZE; i++ )
cpi->QTargetModifier[i] = 1.0;
/* Set up an encode buffer */
#ifndef LIBOGG2
cpi->oggbuffer = _ogg_malloc(sizeof(oggpack_buffer));
oggpackB_writeinit(cpi->oggbuffer);
#else
cpi->oggbuffer = _ogg_malloc(oggpack_buffersize());
cpi->oggbufferstate = ogg_buffer_create();
oggpackB_writeinit(cpi->oggbuffer, cpi->oggbufferstate);
#endif
/* Set data rate related variables. */
cpi->Configuration.TargetBandwidth = (c->target_bitrate) / 8;
cpi->Configuration.OutputFrameRate =
(double)( c->fps_numerator /
c->fps_denominator );
cpi->frame_target_rate = cpi->Configuration.TargetBandwidth /
cpi->Configuration.OutputFrameRate;
/* Set key frame data rate target; this is nominal keyframe size */
cpi->Configuration.KeyFrameDataTarget = (c->keyframe_data_target_bitrate *
c->fps_denominator /
c->fps_numerator ) / 8;
/* Note the height and width in the pre-processor control structure. */
cpi->ScanConfig.VideoFrameHeight = cpi->pb.info.height;
cpi->ScanConfig.VideoFrameWidth = cpi->pb.info.width;
InitFrameDetails(&cpi->pb);
InitFilterTables(&cpi->pb);
EInitFragmentInfo(cpi);
EInitFrameInfo(cpi);
/* Set up pre-processor config pointers. */
cpi->ScanConfig.Yuv0ptr = cpi->yuv0ptr;
cpi->ScanConfig.Yuv1ptr = cpi->yuv1ptr;
cpi->ScanConfig.SrfWorkSpcPtr = cpi->ConvDestBuffer;
cpi->ScanConfig.disp_fragments = cpi->pb.display_fragments;
cpi->ScanConfig.RegionIndex = cpi->pb.pixel_index_table;
/* Initialise the pre-processor module. */
ScanYUVInit(&cpi->pp, &(cpi->ScanConfig));
/* Initialise Motion compensation */
InitMotionCompensation(cpi);
/* Initialise the compression process. */
/* We always start at frame 1 */
cpi->CurrentFrame = 1;
/* Reset the rate targeting correction factor. */
cpi->BpbCorrectionFactor = 1.0;
cpi->TotalByteCount = 0;
cpi->TotalMotionScore = 0;
/* Up regulation variables. */
cpi->FinalPassLastPos = 0; /* Used to regulate a final unrestricted pass. */
cpi->LastEndSB = 0; /* Where we were in the loop last time. */
cpi->ResidueLastEndSB = 0; /* Where we were in the residue update
loop last time. */
InitHuffmanSet(&cpi->pb);
/* This makes sure encoder version specific tables are initialised */
InitQTables(&cpi->pb);
/* Indicate that the next frame to be compressed is the first in the
current clip. */
cpi->ThisIsFirstFrame = 1;
cpi->readyflag = 1;
return 0;
}