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Commit 8379464a authored by Loren Merritt's avatar Loren Merritt
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strict QP offset for B-frame vs following P-frame 

strict QP offset for I-frame vs GOP average


git-svn-id: svn://svn.videolan.org/x264/trunk@91 df754926-b1dd-0310-bc7b-ec298dee348c
parent 0af83ad2
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Showing with 61 additions and 36 deletions
encoder/encoder.c
View file @ 8379464a
......@@ -344,6 +344,8 @@ x264_t *x264_encoder_open ( x264_param_t *param )
h->param.i_cabac_init_idc = x264_clip3( h->param.i_cabac_init_idc, -1, 2 );
param->analyse.i_subpel_refine = x264_clip3( param->analyse.i_subpel_refine, 1, 5 );
if( param->analyse.inter & X264_ANALYSE_PSUB8x8 )
param->analyse.inter &= X264_ANALYSE_PSUB16x16;
if( h->param.rc.f_qblur < 0 )
h->param.rc.f_qblur = 0;
......
encoder/ratecontrol.c
View file @ 8379464a
......@@ -104,6 +104,8 @@ struct x264_ratecontrol_t
double last_qscale;
double last_qscale_for[5]; /* last qscale for a specific pict type, used for max_diff & ipb factor stuff */
int last_non_b_pict_type;
double accum_p_qp; /* for determining I-frame quant */
double accum_p_norm;
double lmin[5]; /* min qscale by frame type */
double lmax[5];
double lstep; /* max change (multiply) in qscale per frame */
......@@ -134,7 +136,7 @@ static inline double qscale2bits(ratecontrol_entry_t *rce, double qscale)
{
if(qscale<0.1)
{
fprintf(stderr, "qscale<0.1\n");
// fprintf(stderr, "qscale<0.1\n");
qscale = 0.1;
}
return (double)(rce->i_tex_bits + rce->p_tex_bits + .1) * rce->qscale / qscale;
......@@ -531,7 +533,11 @@ int x264_ratecontrol_slice_type( x264_t *h, int frame_num )
{
if( h->param.rc.b_stat_read )
{
assert(frame_num < h->rc->num_entries);
if( frame_num >= h->rc->num_entries )
{
x264_log(h, X264_LOG_ERROR, "More input frames than in the 1st pass\n");
return X264_TYPE_P;
}
switch( h->rc->entry[frame_num].new_pict_type )
{
case SLICE_TYPE_I:
......@@ -688,12 +694,6 @@ static double get_qscale(x264_t *h, ratecontrol_entry_t *rce, double rate_factor
if(bits<0.0) bits=0.0;
bits += 1.0; //avoid 1/0 issues
/* I/B difference */
if( pict_type==SLICE_TYPE_I && h->param.rc.f_ip_factor > 0 )
bits *= h->param.rc.f_ip_factor;
else if( pict_type==SLICE_TYPE_B && h->param.rc.f_pb_factor > 0 )
bits /= h->param.rc.f_pb_factor;
return bits2qscale(rce, bits);
}
......@@ -705,13 +705,24 @@ static double get_diff_limited_q(x264_t *h, ratecontrol_entry_t *rce, double q)
// force I/B quants as a function of P quants
const double last_p_q = rcc->last_qscale_for[SLICE_TYPE_P];
const double last_non_b_q= rcc->last_qscale_for[rcc->last_non_b_pict_type];
if( pict_type == SLICE_TYPE_I && h->param.rc.f_ip_factor < 0 )
q = last_p_q / fabs( h->param.rc.f_ip_factor );
else if( pict_type == SLICE_TYPE_B
&& ( h->param.rc.f_pb_factor < 0 || rce->i_tex_bits + rce->p_tex_bits == 0 ) )
q = last_non_b_q * fabs( h->param.rc.f_pb_factor );
else if( pict_type == SLICE_TYPE_P && rce->i_tex_bits + rce->p_tex_bits == 0 )
if( pict_type == SLICE_TYPE_I )
{
if( rcc->accum_p_norm > 0 && h->param.rc.f_ip_factor > 0 )
q = qp2qscale(rcc->accum_p_qp / rcc->accum_p_norm);
q /= fabs( h->param.rc.f_ip_factor );
}
else if( pict_type == SLICE_TYPE_B )
{
if( h->param.rc.f_pb_factor > 0 )
q = last_non_b_q;
q *= fabs( h->param.rc.f_pb_factor );
}
else if( pict_type == SLICE_TYPE_P
&& rcc->last_non_b_pict_type == SLICE_TYPE_P
&& rce->i_tex_bits + rce->p_tex_bits == 0 )
{
q = last_p_q;
}
/* last qscale / qdiff stuff */
if(rcc->last_non_b_pict_type==pict_type || pict_type!=SLICE_TYPE_I)
......@@ -727,6 +738,17 @@ static double get_diff_limited_q(x264_t *h, ratecontrol_entry_t *rce, double q)
rcc->last_qscale_for[pict_type] = q;
if(pict_type!=SLICE_TYPE_B)
rcc->last_non_b_pict_type = pict_type;
if(pict_type==SLICE_TYPE_I)
{
rcc->accum_p_norm = 0;
rcc->accum_p_qp = 0;
}
if(pict_type==SLICE_TYPE_P)
{
float mask = 1 - pow( (float)rce->i_count / rcc->nmb, 2 );
rcc->accum_p_qp = mask * (qscale2qp(q) + rcc->accum_p_qp);
rcc->accum_p_norm = mask * (1 + rcc->accum_p_norm);
}
return q;
}
......@@ -767,17 +789,23 @@ static float rate_estimate_qscale(x264_t *h, int pict_type)
rce = &rcc->entry[picture_number];
if(pict_type!=SLICE_TYPE_I)
assert(pict_type == rce->new_pict_type);
assert(pict_type == rce->new_pict_type);
diff = (int64_t)total_bits - (int64_t)rce->expected_bits;
br_compensation = (rcc->buffer_size - diff) / rcc->buffer_size;
if(br_compensation<=0.0) br_compensation=0.001;
q = rce->new_qscale / br_compensation;
q = x264_clip3f(q, lmin, lmax);
rcc->last_qscale = q;
return q;
if(rce->pict_type == SLICE_TYPE_B)
{
return rcc->last_qscale * h->param.rc.f_pb_factor;
}
else
{
diff = (int64_t)total_bits - (int64_t)rce->expected_bits;
br_compensation = (rcc->buffer_size - diff) / rcc->buffer_size;
br_compensation = x264_clip3f(br_compensation, .5, 2);
q = rce->new_qscale / br_compensation;
q = x264_clip3f(q, lmin, lmax);
rcc->last_qscale = q;
return q;
}
}
static int init_pass2( x264_t *h )
......@@ -789,7 +817,6 @@ static int init_pass2( x264_t *h )
double qblur = h->param.rc.f_qblur;
double cplxblur = h->param.rc.f_complexity_blur;
const int filter_size = (int)(qblur*4) | 1;
const int cplx_filter_size = (int)(cplxblur*2);
double expected_bits;
double *qscale, *blurred_qscale;
int i;
......@@ -812,32 +839,28 @@ static int init_pass2( x264_t *h )
return -1;
}
if(cplxblur<.01)
cplxblur = .01;
for(i=0; i<rcc->num_entries; i++){
ratecontrol_entry_t *rce = &rcc->entry[i];
double weight, weight_sum = 0;
double weight_sum = 0;
double cplx_sum = 0;
double mask = 1.0;
double weight = 1.0;
int j;
/* weighted average of cplx of future frames */
for(j=1; j<cplx_filter_size && j<rcc->num_entries-i; j++){
for(j=1; j<cplxblur*2 && j<rcc->num_entries-i; j++){
ratecontrol_entry_t *rcj = &rcc->entry[i+j];
mask *= (double)(rcc->nmb + rcj->i_count) / rcc->nmb;
weight = mask * exp(-j*j/(cplxblur*cplxblur));
weight *= 1 - pow( (float)rcj->i_count / rcc->nmb, 2 );
if(weight < .0001)
break;
weight_sum += weight;
cplx_sum += weight * (rcj->i_tex_bits + rcj->p_tex_bits) * rce->qscale;
}
/* weighted average of cplx of past frames */
mask = 1.0;
for(j=0; j<cplx_filter_size && j<=i; j++){
weight = 1.0;
for(j=0; j<cplxblur*2 && j<=i; j++){
ratecontrol_entry_t *rcj = &rcc->entry[i-j];
weight = mask * exp(-j*j/(cplxblur*cplxblur));
weight_sum += weight;
cplx_sum += weight * (rcj->i_tex_bits + rcj->p_tex_bits) * rce->qscale;
mask *= (double)(rcc->nmb + rcj->i_count) / rcc->nmb;
weight *= 1 - pow( (float)rcj->i_count / rcc->nmb, 2 );
if(weight < .0001)
break;
}
......
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