29 |
* |
* |
30 |
*****************************************************************************/ |
*****************************************************************************/ |
31 |
|
|
32 |
|
#define BQUANT_PRESCALE |
33 |
#undef COMPENSATE_FORMULA |
#undef COMPENSATE_FORMULA |
34 |
|
|
35 |
|
/* forces second pass not to be bigger than first */ |
36 |
|
#undef PASS_SMALLER |
37 |
|
|
38 |
|
/* automtically alters overflow controls (strength and improvement/degradation) |
39 |
|
to fight most common problems without user's knowladge */ |
40 |
|
#define SMART_OVERFLOW_SETTING |
41 |
|
|
42 |
#include <stdio.h> |
#include <stdio.h> |
43 |
#include <math.h> |
#include <math.h> |
44 |
#include <limits.h> |
#include <limits.h> |
47 |
#include "../image/image.h" |
#include "../image/image.h" |
48 |
|
|
49 |
/***************************************************************************** |
/***************************************************************************** |
50 |
* Some constants |
* Some default settings |
51 |
****************************************************************************/ |
****************************************************************************/ |
52 |
|
|
53 |
#define DEFAULT_KEYFRAME_BOOST 0 |
#define DEFAULT_KEYFRAME_BOOST 0 |
54 |
#define DEFAULT_OVERFLOW_CONTROL_STRENGTH 10 |
#define DEFAULT_OVERFLOW_CONTROL_STRENGTH 10 |
55 |
#define DEFAULT_CURVE_COMPRESSION_HIGH 0 |
#define DEFAULT_CURVE_COMPRESSION_HIGH 0 |
56 |
#define DEFAULT_CURVE_COMPRESSION_LOW 0 |
#define DEFAULT_CURVE_COMPRESSION_LOW 0 |
57 |
#define DEFAULT_MAX_OVERFLOW_IMPROVEMENT 60 |
#define DEFAULT_MAX_OVERFLOW_IMPROVEMENT 10 |
58 |
#define DEFAULT_MAX_OVERFLOW_DEGRADATION 60 |
#define DEFAULT_MAX_OVERFLOW_DEGRADATION 10 |
59 |
|
|
60 |
/* Keyframe settings */ |
/* Keyframe settings */ |
61 |
#define DEFAULT_KFREDUCTION 20 |
#define DEFAULT_KFREDUCTION 20 |
62 |
#define DEFAULT_MIN_KEY_INTERVAL 1 |
#define DEFAULT_KFTHRESHOLD 1 |
63 |
|
|
64 |
|
/***************************************************************************** |
65 |
|
* Some default constants (can be tuned) |
66 |
|
****************************************************************************/ |
67 |
|
|
68 |
|
/* Specify the invariant part of the headers bits (header+MV) |
69 |
|
* as hlength/cst */ |
70 |
|
#define INVARIANT_HEADER_PART_IVOP 1 /* factor 1.0f */ |
71 |
|
#define INVARIANT_HEADER_PART_PVOP 2 /* factor 0.5f */ |
72 |
|
#define INVARIANT_HEADER_PART_BVOP 8 /* factor 0.125f */ |
73 |
|
|
74 |
/***************************************************************************** |
/***************************************************************************** |
75 |
* Structures |
* Structures |
79 |
typedef struct { |
typedef struct { |
80 |
int type; /* first pass type */ |
int type; /* first pass type */ |
81 |
int quant; /* first pass quant */ |
int quant; /* first pass quant */ |
|
int quant2; /* Second pass quant */ |
|
82 |
int blks[3]; /* k,m,y blks */ |
int blks[3]; /* k,m,y blks */ |
83 |
int length; /* first pass length */ |
int length; /* first pass length */ |
84 |
|
int invariant; /* what we assume as being invariant between the two passes, it's a sub part of header + MV bits */ |
85 |
int scaled_length; /* scaled length */ |
int scaled_length; /* scaled length */ |
86 |
int desired_length; /* desired length; calculated during encoding */ |
int desired_length; /* desired length; calculated during encoding */ |
87 |
int error; |
int error; |
113 |
|
|
114 |
/* Total length of each frame types (1st pass) */ |
/* Total length of each frame types (1st pass) */ |
115 |
uint64_t tot_length[3]; |
uint64_t tot_length[3]; |
116 |
|
uint64_t tot_invariant[3]; |
117 |
|
|
118 |
/* Average length of each frame types (used first for 1st pass data and |
/* Average length of each frame types (used first for 1st pass data and |
119 |
* then for scaled averages */ |
* then for scaled averages */ |
134 |
|
|
135 |
/*---------------------------------- |
/*---------------------------------- |
136 |
* Zones statistical data |
* Zones statistical data |
|
* |
|
|
* ToDo: Fix zones, current |
|
|
* implementation is buggy |
|
137 |
*--------------------------------*/ |
*--------------------------------*/ |
138 |
|
|
|
/* Average weight of the zones */ |
|
|
double avg_weight; |
|
|
|
|
139 |
/* Total length used by XVID_ZONE_QUANT zones */ |
/* Total length used by XVID_ZONE_QUANT zones */ |
140 |
int64_t tot_quant; |
uint64_t tot_quant; |
141 |
|
uint64_t tot_quant_invariant; |
142 |
|
|
143 |
|
/* Holds the total amount of frame bytes, zone weighted (only scalable |
144 |
|
* part of frame bytes) */ |
145 |
|
uint64_t tot_weighted; |
146 |
|
|
147 |
/*---------------------------------- |
/*---------------------------------- |
148 |
* Advanced settings helper ratios |
* Advanced settings helper ratios |
177 |
twopass_stat_t * stats; |
twopass_stat_t * stats; |
178 |
|
|
179 |
/*---------------------------------- |
/*---------------------------------- |
180 |
* Histerysis helpers |
* Hysteresis helpers |
181 |
*--------------------------------*/ |
*--------------------------------*/ |
182 |
|
|
183 |
/* This field holds the int2float conversion errors of each quant per |
/* This field holds the int2float conversion errors of each quant per |
212 |
* ToDo: description */ |
* ToDo: description */ |
213 |
double fq_error; |
double fq_error; |
214 |
|
|
215 |
|
int min_quant; /* internal minimal quant, prevents wrong quants from being used */ |
216 |
|
|
217 |
/*---------------------------------- |
/*---------------------------------- |
218 |
* Debug |
* Debug |
219 |
*--------------------------------*/ |
*--------------------------------*/ |
240 |
{ |
{ |
241 |
switch(opt) { |
switch(opt) { |
242 |
case XVID_PLG_INFO : |
case XVID_PLG_INFO : |
243 |
|
case XVID_PLG_FRAME : |
244 |
return 0; |
return 0; |
245 |
|
|
246 |
case XVID_PLG_CREATE : |
case XVID_PLG_CREATE : |
270 |
static void first_pass_stats_prepare_data(rc_2pass2_t * rc); |
static void first_pass_stats_prepare_data(rc_2pass2_t * rc); |
271 |
static void first_pass_scale_curve_internal(rc_2pass2_t *rc); |
static void first_pass_scale_curve_internal(rc_2pass2_t *rc); |
272 |
static void scaled_curve_apply_advanced_parameters(rc_2pass2_t * rc); |
static void scaled_curve_apply_advanced_parameters(rc_2pass2_t * rc); |
273 |
|
static int check_curve_for_vbv_compliancy(rc_2pass2_t * rc, const float fps); |
274 |
|
static int scale_curve_for_vbv_compliancy(rc_2pass2_t * rc, const float fps); |
275 |
#if 0 |
#if 0 |
276 |
static void stats_print(rc_2pass2_t * rc); |
static void stats_print(rc_2pass2_t * rc); |
277 |
#endif |
#endif |
304 |
|
|
305 |
/* Keyframe settings */ |
/* Keyframe settings */ |
306 |
_INIT(rc->param.kfreduction, DEFAULT_KFREDUCTION); |
_INIT(rc->param.kfreduction, DEFAULT_KFREDUCTION); |
307 |
_INIT(rc->param.min_key_interval, DEFAULT_MIN_KEY_INTERVAL); |
_INIT(rc->param.kfthreshold, DEFAULT_KFTHRESHOLD); |
308 |
#undef _INIT |
#undef _INIT |
309 |
|
|
310 |
/* Initialize some stuff to zero */ |
/* Initialize some stuff to zero */ |
319 |
for (i=0; i<3; i++) rc->last_quant[i] = 0; |
for (i=0; i<3; i++) rc->last_quant[i] = 0; |
320 |
|
|
321 |
rc->fq_error = 0; |
rc->fq_error = 0; |
322 |
|
rc->min_quant = 1; |
323 |
|
|
324 |
/* Count frames (and intra frames) in the stats file, store the result into |
/* Count frames (and intra frames) in the stats file, store the result into |
325 |
* the rc structure */ |
* the rc structure */ |
356 |
/* Compute the target filesize */ |
/* Compute the target filesize */ |
357 |
if (rc->param.bitrate<0) { |
if (rc->param.bitrate<0) { |
358 |
/* if negative, bitrate equals the target (in kbytes) */ |
/* if negative, bitrate equals the target (in kbytes) */ |
359 |
rc->target = (-rc->param.bitrate) * 1024; |
rc->target = ((uint64_t)(-rc->param.bitrate)) * 1024; |
360 |
} else if (rc->num_frames < create->fbase/create->fincr) { |
} else if (rc->num_frames < create->fbase/create->fincr) { |
361 |
/* Source sequence is less than 1s long, we do as if it was 1s long */ |
/* Source sequence is less than 1s long, we do as if it was 1s long */ |
362 |
rc->target = rc->param.bitrate / 8; |
rc->target = rc->param.bitrate / 8; |
382 |
if(rc->param.container_frame_overhead) |
if(rc->param.container_frame_overhead) |
383 |
DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- New target filesize after container compensation: %lld\n", rc->target); |
DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- New target filesize after container compensation: %lld\n", rc->target); |
384 |
|
|
385 |
|
/* When bitrate is not given it means it has been scaled by an external |
386 |
|
* application */ |
387 |
|
if (rc->param.bitrate) { |
388 |
|
/* Apply zone settings |
389 |
|
* - set rc->tot_quant which represents the total num of bytes spent in |
390 |
|
* fixed quant zones |
391 |
|
* - set rc->tot_weighted which represents the total amount of bytes |
392 |
|
* spent in normal or weighted zones in first pass (normal zones can |
393 |
|
* be considered weight=1) |
394 |
|
* - set rc->tot_quant_invariant which represents the total num of bytes |
395 |
|
* spent in fixed quant zones for headers */ |
396 |
|
zone_process(rc, create); |
397 |
|
} else { |
398 |
|
/* External scaling -- zones are ignored */ |
399 |
|
for (i=0;i<rc->num_frames;i++) { |
400 |
|
rc->stats[i].zone_mode = XVID_ZONE_WEIGHT; |
401 |
|
rc->stats[i].weight = 1.0; |
402 |
|
} |
403 |
|
rc->tot_quant = 0; |
404 |
|
} |
405 |
|
|
406 |
/* Gathers some information about first pass stats: |
/* Gathers some information about first pass stats: |
407 |
* - finds the minimum frame length for each frame type during 1st pass. |
* - finds the minimum frame length for each frame type during 1st pass. |
408 |
* rc->min_size[] |
* rc->min_size[] |
411 |
* - count how many times each frame type has been used. |
* - count how many times each frame type has been used. |
412 |
* rc->count[] |
* rc->count[] |
413 |
* - total bytes used per frame type |
* - total bytes used per frame type |
414 |
* rc->total[] |
* rc->tot_length[] |
415 |
|
* - total bytes considered invariant between the 2 passes |
416 |
* - store keyframe location |
* - store keyframe location |
417 |
* rc->keyframe_locations[] |
* rc->keyframe_locations[] |
418 |
*/ |
*/ |
419 |
first_pass_stats_prepare_data(rc); |
first_pass_stats_prepare_data(rc); |
420 |
|
|
421 |
/* When bitrate is not given it means it has been scaled by an external |
/* If we have a user bitrate, it means it's an internal curve scaling */ |
|
* application */ |
|
422 |
if (rc->param.bitrate) { |
if (rc->param.bitrate) { |
|
/* Apply zone settings */ |
|
|
zone_process(rc, create); |
|
423 |
/* Perform internal curve scaling */ |
/* Perform internal curve scaling */ |
424 |
first_pass_scale_curve_internal(rc); |
first_pass_scale_curve_internal(rc); |
|
} else { |
|
|
/* External scaling -- zones are ignored */ |
|
|
for (i=0;i<rc->num_frames;i++) { |
|
|
rc->stats[i].zone_mode = XVID_ZONE_WEIGHT; |
|
|
rc->stats[i].weight = 1.0; |
|
|
} |
|
|
rc->avg_weight = 1.0; |
|
|
rc->tot_quant = 0; |
|
425 |
} |
} |
426 |
|
|
427 |
/* Apply advanced curve options, and compute some parameters in order to |
/* Apply advanced curve options, and compute some parameters in order to |
428 |
* shape the curve in the BEFORE/AFTER pair of functions */ |
* shape the curve in the BEFORE/AFTER pair of functions */ |
429 |
scaled_curve_apply_advanced_parameters(rc); |
scaled_curve_apply_advanced_parameters(rc); |
430 |
|
|
431 |
|
/* Check curve for VBV compliancy and rescale if necessary */ |
432 |
|
|
433 |
|
#ifdef VBV_FORCE |
434 |
|
if (rc->param.vbv_size==0) |
435 |
|
{ |
436 |
|
rc->param.vbv_size = 3145728; |
437 |
|
rc->param.vbv_initial = 2359296; |
438 |
|
rc->param.vbv_maxrate = 4000000; |
439 |
|
rc->param.vbv_peakrate = 10000000; |
440 |
|
} |
441 |
|
#endif |
442 |
|
|
443 |
|
if (rc->param.vbv_size>0) /* vbv_size==0 switches VBV check off */ |
444 |
|
{ |
445 |
|
const double fps = (double)create->fbase/(double)create->fincr; |
446 |
|
int status = check_curve_for_vbv_compliancy(rc, fps); |
447 |
|
#ifdef VBV_DEBUG |
448 |
|
if (status) |
449 |
|
fprintf(stderr,"underflow detected\n Scaling Curve for compliancy... "); |
450 |
|
#endif |
451 |
|
|
452 |
|
status = scale_curve_for_vbv_compliancy(rc, fps); |
453 |
|
|
454 |
|
#ifdef VBV_DEBUG |
455 |
|
if (status==0) |
456 |
|
fprintf(stderr,"done.\n"); |
457 |
|
else |
458 |
|
fprintf(stderr,"impossible.\n"); |
459 |
|
#endif |
460 |
|
} |
461 |
*handle = rc; |
*handle = rc; |
462 |
return(0); |
return(0); |
463 |
} |
} |
500 |
if (data->quant > 0) |
if (data->quant > 0) |
501 |
return(0); |
return(0); |
502 |
|
|
503 |
/* Second case: We are in a Quant zone */ |
/* Second case: insufficent stats data |
504 |
|
* We can't guess much what we should do, let core decide all alone */ |
505 |
|
if (data->frame_num >= rc->num_frames) { |
506 |
|
DPRINTF(XVID_DEBUG_RC,"[xvid rc] -- stats file too short (now processing frame %d)", |
507 |
|
data->frame_num); |
508 |
|
return(0); |
509 |
|
} |
510 |
|
|
511 |
|
/* Third case: We are in a Quant zone |
512 |
|
* Quant zones must just ensure we use the same settings as first pass |
513 |
|
* So set the quantizer and the type */ |
514 |
if (s->zone_mode == XVID_ZONE_QUANT) { |
if (s->zone_mode == XVID_ZONE_QUANT) { |
515 |
|
/* Quant stuff */ |
516 |
rc->fq_error += s->weight; |
rc->fq_error += s->weight; |
517 |
data->quant = (int)rc->fq_error; |
data->quant = (int)rc->fq_error; |
518 |
rc->fq_error -= data->quant; |
rc->fq_error -= data->quant; |
519 |
|
|
520 |
|
/* The type stuff */ |
521 |
|
data->type = s->type; |
522 |
|
|
523 |
|
/* The only required data for AFTER step is this one for the overflow |
524 |
|
* control */ |
525 |
s->desired_length = s->length; |
s->desired_length = s->length; |
526 |
|
|
527 |
return(0); |
return(0); |
528 |
} |
} |
529 |
|
|
|
/* Third case: insufficent stats data */ |
|
|
if (data->frame_num >= rc->num_frames) |
|
|
return(0); |
|
530 |
|
|
531 |
/*************************************************************************/ |
/*************************************************************************/ |
532 |
/*************************************************************************/ |
/*************************************************************************/ |
544 |
|
|
545 |
/* IFrame user settings*/ |
/* IFrame user settings*/ |
546 |
if (s->type == XVID_TYPE_IVOP) { |
if (s->type == XVID_TYPE_IVOP) { |
|
|
|
547 |
/* Keyframe boosting -- All keyframes benefit from it */ |
/* Keyframe boosting -- All keyframes benefit from it */ |
548 |
dbytes += dbytes*rc->param.keyframe_boost / 100; |
dbytes += dbytes*rc->param.keyframe_boost / 100; |
549 |
|
|
550 |
/* Applies keyframe penalties, but not the first frame */ |
#if 0 /* ToDo: decide how to apply kfthresholding */ |
551 |
if (rc->KF_idx) { |
#endif |
|
int penalty_distance; |
|
|
|
|
|
/* Minimum keyframe distance penalties */ |
|
|
penalty_distance = rc->param.min_key_interval; |
|
|
penalty_distance -= rc->keyframe_locations[rc->KF_idx]; |
|
|
penalty_distance += rc->keyframe_locations[rc->KF_idx-1]; |
|
|
|
|
|
/* Ah ah ! guilty keyframe, you're under arrest ! */ |
|
|
if (penalty_distance > 0) |
|
|
dbytes -= dbytes*penalty_distance*rc->param.kfreduction/100; |
|
|
} |
|
552 |
} else { |
} else { |
553 |
|
|
554 |
/* P/S/B frames must reserve some bits for iframe boosting */ |
/* P/S/B frames must reserve some bits for iframe boosting */ |
590 |
*-----------------------------------------------------------------------*/ |
*-----------------------------------------------------------------------*/ |
591 |
|
|
592 |
/* Compute the overflow we should compensate */ |
/* Compute the overflow we should compensate */ |
593 |
if (s->type != XVID_TYPE_IVOP) { |
if (s->type != XVID_TYPE_IVOP || rc->overflow > 0) { |
594 |
double frametype_factor; |
double frametype_factor; |
595 |
double framesize_factor; |
double framesize_factor; |
596 |
|
|
621 |
/* Apply the overflow strength imposed by the user */ |
/* Apply the overflow strength imposed by the user */ |
622 |
overflow *= (rc->param.overflow_control_strength/100.0f); |
overflow *= (rc->param.overflow_control_strength/100.0f); |
623 |
} else { |
} else { |
624 |
/* no overflow applied in IFrames because: |
/* no negative overflow applied in IFrames because: |
625 |
* - their role is important as they're references for P/BFrames. |
* - their role is important as they're references for P/BFrames. |
626 |
* - there aren't much in typical sequences, so if an IFrame overflows too |
* - there aren't much in typical sequences, so if an IFrame overflows too |
627 |
* much, this overflow may impact the next IFrame too much and generate |
* much, this overflow may impact the next IFrame too much and generate |
653 |
* pass nor smaller than the allowed minimum. |
* pass nor smaller than the allowed minimum. |
654 |
*-----------------------------------------------------------------------*/ |
*-----------------------------------------------------------------------*/ |
655 |
|
|
656 |
|
#ifdef PASS_SMALLER |
657 |
if (dbytes > s->length) { |
if (dbytes > s->length) { |
658 |
dbytes = s->length; |
dbytes = s->length; |
659 |
} else if (dbytes < rc->min_length[s->type-1]) { |
} |
660 |
|
#endif |
661 |
|
|
662 |
|
/* Prevent stupid desired sizes under logical values */ |
663 |
|
if (dbytes < rc->min_length[s->type-1]) { |
664 |
dbytes = rc->min_length[s->type-1]; |
dbytes = rc->min_length[s->type-1]; |
|
} else if (dbytes > rc->max_length) { |
|
|
/* ToDo: this condition is always wrong as max_length == maximum frame |
|
|
* length of first pass, so the first condition already caps the frame |
|
|
* size... */ |
|
|
capped_to_max_framesize = 1; |
|
|
dbytes = rc->max_length; |
|
|
DPRINTF(XVID_DEBUG_RC,"[xvid rc] -- frame:%d Capped to maximum frame size\n", |
|
|
data->frame_num); |
|
665 |
} |
} |
666 |
|
|
667 |
/*------------------------------------------------------------------------ |
/*------------------------------------------------------------------------ |
668 |
* Desired frame length <-> quantizer mapping |
* Desired frame length <-> quantizer mapping |
669 |
*-----------------------------------------------------------------------*/ |
*-----------------------------------------------------------------------*/ |
670 |
|
|
671 |
/* For bframes we must retrieve the original quant used (sent to xvidcore) |
#ifdef BQUANT_PRESCALE |
672 |
* as core applies the bquant formula before writing the stat log entry */ |
/* For bframes we prescale the quantizer to avoid too high quant scaling */ |
673 |
if(s->type == XVID_TYPE_BVOP) { |
if(s->type == XVID_TYPE_BVOP) { |
674 |
|
|
675 |
twopass_stat_t *b_ref = s; |
twopass_stat_t *b_ref = s; |
680 |
|
|
681 |
/* Compute the original quant */ |
/* Compute the original quant */ |
682 |
s->quant = 2*(100*s->quant - data->bquant_offset); |
s->quant = 2*(100*s->quant - data->bquant_offset); |
683 |
s->quant += data->bquant_ratio - 1; /* to avoid rouding issues */ |
s->quant += data->bquant_ratio - 1; /* to avoid rounding issues */ |
684 |
s->quant = s->quant/data->bquant_ratio - b_ref->quant; |
s->quant = s->quant/data->bquant_ratio - b_ref->quant; |
685 |
} |
} |
686 |
|
#endif |
687 |
|
|
688 |
/* Don't laugh at this very 'simple' quant<->filesize relationship, it |
/* Don't laugh at this very 'simple' quant<->size relationship, it |
689 |
* proves to be acurate enough for our algorithm */ |
* proves to be acurate enough for our algorithm */ |
690 |
scaled_quant = (double)s->quant*(double)s->length/(double)dbytes; |
scaled_quant = (double)s->quant*(double)s->length/(double)dbytes; |
691 |
|
|
746 |
data->quant = data->max_quant[s->type-1]; |
data->quant = data->max_quant[s->type-1]; |
747 |
} |
} |
748 |
|
|
749 |
|
if (data->quant < rc->min_quant) data->quant = rc->min_quant; |
750 |
|
|
751 |
/* To avoid big quality jumps from frame to frame, we apply a "security" |
/* To avoid big quality jumps from frame to frame, we apply a "security" |
752 |
* rule that makes |last_quant - new_quant| <= 2. This rule only applies |
* rule that makes |last_quant - new_quant| <= 2. This rule only applies |
753 |
* to predicted frames (P and B) */ |
* to predicted frames (P and B) */ |
775 |
/* Don't forget to force 1st pass frame type ;-) */ |
/* Don't forget to force 1st pass frame type ;-) */ |
776 |
data->type = s->type; |
data->type = s->type; |
777 |
|
|
|
/* Store the quantizer into the statistics -- Used to compensate the double |
|
|
* formula symptom */ |
|
|
s->quant2 = data->quant; |
|
|
|
|
778 |
return 0; |
return 0; |
779 |
} |
} |
780 |
|
|
836 |
rc->KFoverflow -= rc->KFoverflow_partial; |
rc->KFoverflow -= rc->KFoverflow_partial; |
837 |
} |
} |
838 |
|
|
839 |
rc->overflow += s->error = s->desired_length - data->length; |
rc->overflow += (s->error = s->desired_length - data->length); |
840 |
rc->real_total += data->length; |
rc->real_total += data->length; |
841 |
|
|
842 |
DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- frame:%d type:%c quant:%d stats:%d scaled:%d desired:%d actual:%d error:%d overflow:%.2f\n", |
DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- frame:%d type:%c quant:%d stats:%d scaled:%d desired:%d actual:%d error:%d overflow:%.2f\n", |
901 |
/* Read the stat line from buffer */ |
/* Read the stat line from buffer */ |
902 |
fields = sscanf(ptr, "%c", &type); |
fields = sscanf(ptr, "%c", &type); |
903 |
|
|
904 |
/* Valid stats files have at least 6 fields */ |
/* Valid stats files have at least 7 fields */ |
905 |
if (fields == 1) { |
if (fields == 1) { |
906 |
switch(type) { |
switch(type) { |
907 |
case 'i': |
case 'i': |
923 |
} else { |
} else { |
924 |
DPRINTF(XVID_DEBUG_RC, |
DPRINTF(XVID_DEBUG_RC, |
925 |
"[xvid rc] -- WARNING: L%d misses some stat fields (%d).\n", |
"[xvid rc] -- WARNING: L%d misses some stat fields (%d).\n", |
926 |
lines, 6-fields); |
lines, 7-fields); |
927 |
} |
} |
928 |
|
|
929 |
/* Free the line buffer */ |
/* Free the line buffer */ |
972 |
|
|
973 |
/* Convert the fields */ |
/* Convert the fields */ |
974 |
fields = sscanf(ptr, |
fields = sscanf(ptr, |
975 |
"%c %d %d %d %d %d %d\n", |
"%c %d %d %d %d %d %d %d\n", |
976 |
&type, |
&type, |
977 |
&s->quant, |
&s->quant, |
978 |
&s->blks[0], &s->blks[1], &s->blks[2], |
&s->blks[0], &s->blks[1], &s->blks[2], |
979 |
&s->length, |
&s->length, &s->invariant /* not really yet */, |
980 |
&s->scaled_length); |
&s->scaled_length); |
981 |
|
|
982 |
/* Free line buffer, we don't need it anymore */ |
/* Free line buffer, we don't need it anymore */ |
984 |
|
|
985 |
/* Fail silently, this has probably been warned in |
/* Fail silently, this has probably been warned in |
986 |
* statsfile_count_frames */ |
* statsfile_count_frames */ |
987 |
if(fields != 6 && fields != 7) |
if(fields != 7 && fields != 8) |
988 |
continue; |
continue; |
989 |
|
|
990 |
/* Convert frame type */ |
/* Convert frame type and compute the invariant length part */ |
991 |
switch(type) { |
switch(type) { |
992 |
case 'i': |
case 'i': |
993 |
case 'I': |
case 'I': |
994 |
s->type = XVID_TYPE_IVOP; |
s->type = XVID_TYPE_IVOP; |
995 |
|
s->invariant /= INVARIANT_HEADER_PART_IVOP; |
996 |
break; |
break; |
997 |
case 'p': |
case 'p': |
998 |
case 'P': |
case 'P': |
999 |
case 's': |
case 's': |
1000 |
case 'S': |
case 'S': |
1001 |
s->type = XVID_TYPE_PVOP; |
s->type = XVID_TYPE_PVOP; |
1002 |
|
s->invariant /= INVARIANT_HEADER_PART_PVOP; |
1003 |
break; |
break; |
1004 |
case 'b': |
case 'b': |
1005 |
case 'B': |
case 'B': |
1006 |
s->type = XVID_TYPE_BVOP; |
s->type = XVID_TYPE_BVOP; |
1007 |
|
s->invariant /= INVARIANT_HEADER_PART_BVOP; |
1008 |
break; |
break; |
1009 |
default: |
default: |
1010 |
/* Same as before, fail silently */ |
/* Same as before, fail silently */ |
1023 |
|
|
1024 |
/* pre-process the statistics data |
/* pre-process the statistics data |
1025 |
* - for each type, count, tot_length, min_length, max_length |
* - for each type, count, tot_length, min_length, max_length |
1026 |
* - set keyframes_locations */ |
* - set keyframes_locations, tot_prescaled */ |
1027 |
static void |
static void |
1028 |
first_pass_stats_prepare_data(rc_2pass2_t * rc) |
first_pass_stats_prepare_data(rc_2pass2_t * rc) |
1029 |
{ |
{ |
1035 |
for (i=0; i<3; i++) { |
for (i=0; i<3; i++) { |
1036 |
rc->count[i]=0; |
rc->count[i]=0; |
1037 |
rc->tot_length[i] = 0; |
rc->tot_length[i] = 0; |
1038 |
|
rc->tot_invariant[i] = 0; |
1039 |
rc->min_length[i] = INT_MAX; |
rc->min_length[i] = INT_MAX; |
1040 |
} |
} |
1041 |
|
|
1042 |
rc->max_length = INT_MIN; |
rc->max_length = INT_MIN; |
1043 |
|
rc->tot_weighted = 0; |
1044 |
|
|
1045 |
/* Loop through all frames and find/compute all the stuff this function |
/* Loop through all frames and find/compute all the stuff this function |
1046 |
* is supposed to do */ |
* is supposed to do */ |
1049 |
|
|
1050 |
rc->count[s->type-1]++; |
rc->count[s->type-1]++; |
1051 |
rc->tot_length[s->type-1] += s->length; |
rc->tot_length[s->type-1] += s->length; |
1052 |
|
rc->tot_invariant[s->type-1] += s->invariant; |
1053 |
|
if (s->zone_mode != XVID_ZONE_QUANT) |
1054 |
|
rc->tot_weighted += (int)(s->weight*(s->length - s->invariant)); |
1055 |
|
|
1056 |
if (s->length < rc->min_length[s->type-1]) { |
if (s->length < rc->min_length[s->type-1]) { |
1057 |
rc->min_length[s->type-1] = s->length; |
rc->min_length[s->type-1] = s->length; |
1086 |
int i,j; |
int i,j; |
1087 |
int n = 0; |
int n = 0; |
1088 |
|
|
|
rc->avg_weight = 0.0; |
|
1089 |
rc->tot_quant = 0; |
rc->tot_quant = 0; |
1090 |
|
rc->tot_quant_invariant = 0; |
1091 |
|
|
1092 |
if (create->num_zones == 0) { |
if (create->num_zones == 0) { |
1093 |
for (j = 0; j < rc->num_frames; j++) { |
for (j = 0; j < rc->num_frames; j++) { |
1094 |
rc->stats[j].zone_mode = XVID_ZONE_WEIGHT; |
rc->stats[j].zone_mode = XVID_ZONE_WEIGHT; |
1095 |
rc->stats[j].weight = 1.0; |
rc->stats[j].weight = 1.0; |
1096 |
} |
} |
|
rc->avg_weight += rc->num_frames * 1.0; |
|
1097 |
n += rc->num_frames; |
n += rc->num_frames; |
1098 |
} |
} |
1099 |
|
|
1102 |
|
|
1103 |
int next = (i+1<create->num_zones) ? create->zones[i+1].frame : rc->num_frames; |
int next = (i+1<create->num_zones) ? create->zones[i+1].frame : rc->num_frames; |
1104 |
|
|
1105 |
|
/* Zero weight make no sense */ |
1106 |
|
if (create->zones[i].increment == 0) create->zones[i].increment = 1; |
1107 |
|
/* And obviously an undetermined infinite makes even less sense */ |
1108 |
|
if (create->zones[i].base == 0) create->zones[i].base = 1; |
1109 |
|
|
1110 |
if (i==0 && create->zones[i].frame > 0) { |
if (i==0 && create->zones[i].frame > 0) { |
1111 |
for (j = 0; j < create->zones[i].frame && j < rc->num_frames; j++) { |
for (j = 0; j < create->zones[i].frame && j < rc->num_frames; j++) { |
1112 |
rc->stats[j].zone_mode = XVID_ZONE_WEIGHT; |
rc->stats[j].zone_mode = XVID_ZONE_WEIGHT; |
1113 |
rc->stats[j].weight = 1.0; |
rc->stats[j].weight = 1.0; |
1114 |
} |
} |
|
rc->avg_weight += create->zones[i].frame * 1.0; |
|
1115 |
n += create->zones[i].frame; |
n += create->zones[i].frame; |
1116 |
} |
} |
1117 |
|
|
1121 |
rc->stats[j].weight = (double)create->zones[i].increment / (double)create->zones[i].base; |
rc->stats[j].weight = (double)create->zones[i].increment / (double)create->zones[i].base; |
1122 |
} |
} |
1123 |
next -= create->zones[i].frame; |
next -= create->zones[i].frame; |
|
rc->avg_weight += (double)(next * create->zones[i].increment) / (double)create->zones[i].base; |
|
1124 |
n += next; |
n += next; |
1125 |
}else{ /* XVID_ZONE_QUANT */ |
}else{ /* XVID_ZONE_QUANT */ |
1126 |
for (j = create->zones[i].frame; j < next && j < rc->num_frames; j++ ) { |
for (j = create->zones[i].frame; j < next && j < rc->num_frames; j++ ) { |
1127 |
rc->stats[j].zone_mode = XVID_ZONE_QUANT; |
rc->stats[j].zone_mode = XVID_ZONE_QUANT; |
1128 |
rc->stats[j].weight = (double)create->zones[i].increment / (double)create->zones[i].base; |
rc->stats[j].weight = (double)create->zones[i].increment / (double)create->zones[i].base; |
1129 |
rc->tot_quant += rc->stats[j].length; |
rc->tot_quant += rc->stats[j].length; |
1130 |
|
rc->tot_quant_invariant += rc->stats[j].invariant; |
1131 |
} |
} |
1132 |
} |
} |
1133 |
} |
} |
|
rc->avg_weight = n>0 ? rc->avg_weight/n : 1.0; |
|
|
|
|
|
DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- center_weight:%f (for %d frames) fixed_bytes:%d\n", rc->avg_weight, n, rc->tot_quant); |
|
1134 |
} |
} |
1135 |
|
|
1136 |
|
|
1139 |
first_pass_scale_curve_internal(rc_2pass2_t *rc) |
first_pass_scale_curve_internal(rc_2pass2_t *rc) |
1140 |
{ |
{ |
1141 |
int64_t target; |
int64_t target; |
1142 |
int64_t pass1_length; |
int64_t total_invariant; |
1143 |
double scaler; |
double scaler; |
1144 |
int i, num_MBs; |
int i, num_MBs; |
1145 |
|
|
1146 |
/* We remove the bytes used by the fixed quantizer zones |
/* We only scale texture data ! */ |
1147 |
* ToDo: this approach is flawed, the same amount of bytes is removed from |
total_invariant = rc->tot_invariant[XVID_TYPE_IVOP-1]; |
1148 |
* target and first pass data, this has no sense, zone_process should |
total_invariant += rc->tot_invariant[XVID_TYPE_PVOP-1]; |
1149 |
* give us two results one for unscaled data (1pass) and the other |
total_invariant += rc->tot_invariant[XVID_TYPE_BVOP-1]; |
1150 |
* one for scaled data and we should then write: |
/* don't forget to substract header bytes used in quant zones, otherwise we |
1151 |
* target = rc->target - rc->tot_quant_scaled; |
* counting them twice */ |
1152 |
* pass1_length = rc->i+p+b - rc->tot_quant_firstpass */ |
total_invariant -= rc->tot_quant_invariant; |
1153 |
target = rc->target - rc->tot_quant; |
|
1154 |
|
/* We remove the bytes used by the fixed quantizer zones during first pass |
1155 |
/* Do the same for the first pass data */ |
* with the same quants, so we know very precisely how much that |
1156 |
pass1_length = rc->tot_length[XVID_TYPE_IVOP-1]; |
* represents */ |
1157 |
pass1_length += rc->tot_length[XVID_TYPE_PVOP-1]; |
target = rc->target; |
1158 |
pass1_length += rc->tot_length[XVID_TYPE_BVOP-1]; |
target -= rc->tot_quant; |
|
pass1_length -= rc->tot_quant; |
|
1159 |
|
|
1160 |
/* Let's compute a linear scaler in order to perform curve scaling */ |
/* Let's compute a linear scaler in order to perform curve scaling */ |
1161 |
scaler = (double)target / (double)pass1_length; |
scaler = (double)(target - total_invariant) / (double)(rc->tot_weighted); |
1162 |
|
|
1163 |
if (target <= 0 || pass1_length <= 0 || target >= pass1_length) { |
#ifdef SMART_OVERFLOW_SETTING |
1164 |
DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- WARNING: Undersize detected before correction\n"); |
if (scaler > 0.9) { |
1165 |
scaler = 1.0; |
rc->param.max_overflow_degradation *= 5; |
1166 |
|
rc->param.max_overflow_improvement *= 5; |
1167 |
|
rc->param.overflow_control_strength *= 3; |
1168 |
|
} else if (scaler > 0.6) { |
1169 |
|
rc->param.max_overflow_degradation *= 2; |
1170 |
|
rc->param.max_overflow_improvement *= 2; |
1171 |
|
rc->param.overflow_control_strength *= 2; |
1172 |
|
} else { |
1173 |
|
rc->min_quant = 2; |
1174 |
} |
} |
1175 |
|
#endif |
1176 |
|
|
1177 |
/* Compute min frame lengths (for each frame type) according to the number |
/* Compute min frame lengths (for each frame type) according to the number |
1178 |
* of MBs. We sum all block type counters of frame 0, this gives us the |
* of MBs. We sum all block type counters of frame 0, this gives us the |
1214 |
continue; |
continue; |
1215 |
} |
} |
1216 |
|
|
1217 |
/* Compute the scaled length */ |
/* Compute the scaled length -- only non invariant data length is scaled */ |
1218 |
len = (int)((double)s->length * scaler * s->weight / rc->avg_weight); |
len = s->invariant + (int)((double)(s->length-s->invariant) * scaler * s->weight); |
1219 |
|
|
1220 |
/* Compare with the computed minimum */ |
/* Compare with the computed minimum */ |
1221 |
if (len < rc->min_length[s->type-1]) { |
if (len < rc->min_length[s->type-1]) { |
1227 |
* total counters, as we prepare a second pass for 'regular' |
* total counters, as we prepare a second pass for 'regular' |
1228 |
* frames */ |
* frames */ |
1229 |
target -= s->scaled_length; |
target -= s->scaled_length; |
|
pass1_length -= s->length; |
|
1230 |
} else { |
} else { |
1231 |
/* Do nothing for now, we'll scale this later */ |
/* Do nothing for now, we'll scale this later */ |
1232 |
s->scaled_length = 0; |
s->scaled_length = 0; |
1237 |
* total counters. Now, it's possible to scale the 'regular' frames. */ |
* total counters. Now, it's possible to scale the 'regular' frames. */ |
1238 |
|
|
1239 |
/* Scaling factor for 'regular' frames */ |
/* Scaling factor for 'regular' frames */ |
1240 |
scaler = (double)target / (double)pass1_length; |
scaler = (double)(target - total_invariant) / (double)(rc->tot_weighted); |
|
|
|
|
/* Detect undersizing */ |
|
|
if (target <= 0 || pass1_length <= 0 || target >= pass1_length) { |
|
|
DPRINTF(XVID_DEBUG_RC, "[xvid rc] -- WARNING: Undersize detected after correction\n"); |
|
|
scaler = 1.0; |
|
|
} |
|
1241 |
|
|
1242 |
/* Do another pass with the new scaler */ |
/* Do another pass with the new scaler */ |
1243 |
for (i=0; i<rc->num_frames; i++) { |
for (i=0; i<rc->num_frames; i++) { |
1245 |
|
|
1246 |
/* Ignore frame with forced frame sizes */ |
/* Ignore frame with forced frame sizes */ |
1247 |
if (s->scaled_length == 0) |
if (s->scaled_length == 0) |
1248 |
s->scaled_length = (int)((double)s->length * scaler * s->weight / rc->avg_weight); |
s->scaled_length = s->invariant + (int)((double)(s->length-s->invariant) * scaler * s->weight); |
1249 |
} |
} |
1250 |
|
|
1251 |
/* Job done */ |
/* Job done */ |
1260 |
scaled_curve_apply_advanced_parameters(rc_2pass2_t * rc) |
scaled_curve_apply_advanced_parameters(rc_2pass2_t * rc) |
1261 |
{ |
{ |
1262 |
int i; |
int i; |
1263 |
uint64_t ivop_boost_total; |
int64_t ivop_boost_total; |
1264 |
|
|
1265 |
/* Reset the rate controller (per frame type) total byte counters */ |
/* Reset the rate controller (per frame type) total byte counters */ |
1266 |
for (i=0; i<3; i++) rc->tot_scaled_length[i] = 0; |
for (i=0; i<3; i++) rc->tot_scaled_length[i] = 0; |
1283 |
|
|
1284 |
/* Some more work is needed for I frames */ |
/* Some more work is needed for I frames */ |
1285 |
if (s->type == XVID_TYPE_IVOP) { |
if (s->type == XVID_TYPE_IVOP) { |
|
int penalty_distance; |
|
1286 |
int ivop_boost; |
int ivop_boost; |
1287 |
|
|
1288 |
/* Accumulate bytes needed for keyframe boosting */ |
/* Accumulate bytes needed for keyframe boosting */ |
1289 |
ivop_boost = s->scaled_length*rc->param.keyframe_boost/100; |
ivop_boost = s->scaled_length*rc->param.keyframe_boost/100; |
1290 |
|
|
1291 |
if (rc->KF_idx) { |
#if 0 /* ToDo: decide how to apply kfthresholding */ |
1292 |
/* Minimum keyframe distance penalties */ |
#endif |
|
penalty_distance = rc->param.min_key_interval; |
|
|
penalty_distance -= rc->keyframe_locations[rc->KF_idx]; |
|
|
penalty_distance += rc->keyframe_locations[rc->KF_idx-1]; |
|
|
|
|
|
/* Ah ah ! guilty keyframe, you're under arrest ! */ |
|
|
if (penalty_distance > 0) |
|
|
ivop_boost -= (s->scaled_length + ivop_boost)*penalty_distance*rc->param.kfreduction/100; |
|
|
} |
|
|
|
|
1293 |
/* If the frame size drops under the minimum length, then cap ivop_boost */ |
/* If the frame size drops under the minimum length, then cap ivop_boost */ |
1294 |
if (ivop_boost + s->scaled_length < rc->min_length[XVID_TYPE_IVOP-1]) |
if (ivop_boost + s->scaled_length < rc->min_length[XVID_TYPE_IVOP-1]) |
1295 |
ivop_boost = rc->min_length[XVID_TYPE_IVOP-1] - s->scaled_length; |
ivop_boost = rc->min_length[XVID_TYPE_IVOP-1] - s->scaled_length; |
1319 |
|
|
1320 |
/* Compute the ratio described above |
/* Compute the ratio described above |
1321 |
* taxed_total = sum(0, n, tax*scaled_length) |
* taxed_total = sum(0, n, tax*scaled_length) |
1322 |
* <=> taxed_total = tax.sum(0, n, tax*scaled_length) |
* <=> taxed_total = tax.sum(0, n, scaled_length) |
1323 |
* <=> tax = taxed_total / original_total */ |
* <=> tax = taxed_total / original_total */ |
1324 |
rc->pb_iboost_tax_ratio = |
rc->pb_iboost_tax_ratio = |
1325 |
(rc->pb_iboost_tax_ratio - ivop_boost_total) / |
(rc->pb_iboost_tax_ratio - ivop_boost_total) / |
1413 |
} |
} |
1414 |
|
|
1415 |
/***************************************************************************** |
/***************************************************************************** |
1416 |
|
* VBV compliancy check and scale |
1417 |
|
* MPEG-4 standard specifies certain restrictions for bitrate/framesize in VBR |
1418 |
|
* to enable playback on devices with limited readspeed and memory (and which |
1419 |
|
* aren't...) |
1420 |
|
* |
1421 |
|
* DivX profiles have 2 criteria: VBV as in MPEG standard |
1422 |
|
* a limit on peak bitrate for any 3 seconds |
1423 |
|
* |
1424 |
|
* But if VBV is fulfilled, peakrate is automatically fulfilled in any profile |
1425 |
|
* define so far, so we check for it (for completeness) but correct only VBV |
1426 |
|
* |
1427 |
|
*****************************************************************************/ |
1428 |
|
|
1429 |
|
#define VBV_COMPLIANT 0 |
1430 |
|
#define VBV_UNDERFLOW 1 /* video buffer runs empty */ |
1431 |
|
#define VBV_OVERFLOW 2 /* doesn't exist for VBR encoding */ |
1432 |
|
#define VBV_PEAKRATE 4 /* peak bitrate (within 3s) violated */ |
1433 |
|
|
1434 |
|
static int check_curve_for_vbv_compliancy(rc_2pass2_t * rc, const float fps) |
1435 |
|
{ |
1436 |
|
/* We do all calculations in float, for higher accuracy, |
1437 |
|
and in bytes for convenience |
1438 |
|
|
1439 |
|
typical values from DivX Home Theater profile: |
1440 |
|
vbv_size= 384*1024 (384kB), vbv_initial= 288*1024 (75% fill) |
1441 |
|
maxrate= 4000000 (4MBps), peakrate= 10000000 (10MBps) |
1442 |
|
|
1443 |
|
PAL: offset3s = 75 (3 seconds of 25fps) |
1444 |
|
NTSC: offset3s = 90 (3 seconds of 29.97fps) or 72 (3 seconds of 23.976fps) |
1445 |
|
*/ |
1446 |
|
|
1447 |
|
const float vbv_size = (float)rc->param.vbv_size/8.f; |
1448 |
|
float vbvfill = (float)rc->param.vbv_initial/8.f; |
1449 |
|
|
1450 |
|
const float maxrate = (float)rc->param.vbv_maxrate; |
1451 |
|
const float peakrate = (float)rc->param.vbv_peakrate; |
1452 |
|
const float r0 = (int)(maxrate/fps+0.5)/8.f; |
1453 |
|
|
1454 |
|
int bytes3s = 0; |
1455 |
|
int offset3s = (int)(3.f*fps+0.5); |
1456 |
|
|
1457 |
|
int i; |
1458 |
|
for (i=0; i<rc->num_frames; i++) { |
1459 |
|
/* DivX 3s peak bitrate check */ |
1460 |
|
|
1461 |
|
bytes3s += rc->stats[i].scaled_length; |
1462 |
|
if (i>=offset3s) |
1463 |
|
bytes3s -= rc->stats[i-offset3s].scaled_length; |
1464 |
|
|
1465 |
|
if (8.f*bytes3s > 3*peakrate) |
1466 |
|
return VBV_PEAKRATE; |
1467 |
|
|
1468 |
|
/* update vbv fill level */ |
1469 |
|
|
1470 |
|
vbvfill += r0 - rc->stats[i].scaled_length; |
1471 |
|
|
1472 |
|
/* this check is _NOT_ an "overflow"! only reading from disk stops then */ |
1473 |
|
if (vbvfill > vbv_size) |
1474 |
|
vbvfill = vbv_size; |
1475 |
|
|
1476 |
|
/* but THIS would be an underflow. report it! */ |
1477 |
|
if (vbvfill < 0) |
1478 |
|
return VBV_UNDERFLOW; |
1479 |
|
} |
1480 |
|
|
1481 |
|
return VBV_COMPLIANT; |
1482 |
|
} |
1483 |
|
/* TODO: store min(vbvfill) and print "minimum buffer fill" */ |
1484 |
|
|
1485 |
|
|
1486 |
|
static int scale_curve_for_vbv_compliancy(rc_2pass2_t * rc, const float fps) |
1487 |
|
{ |
1488 |
|
/* correct any VBV violations. Peak bitrate violations disappears |
1489 |
|
by this automatically |
1490 |
|
|
1491 |
|
This implementation follows |
1492 |
|
|
1493 |
|
Westerink, Rajagopalan, Gonzales "Two-pass MPEG-2 variable-bitrate encoding" |
1494 |
|
IBM J. RES. DEVELOP. VOL 43, No. 4, July 1999, p.471--488 |
1495 |
|
|
1496 |
|
Thanks, guys! This paper rocks!!! |
1497 |
|
*/ |
1498 |
|
|
1499 |
|
/* |
1500 |
|
For each scene of len N, we have to check up to N^2 possible buffer fills. |
1501 |
|
This works well with MPEG-2 where N==12 or so, but for MPEG-4 it's a |
1502 |
|
little slow... |
1503 |
|
|
1504 |
|
TODO: Better control on VBVfill between scenes |
1505 |
|
*/ |
1506 |
|
|
1507 |
|
const float vbv_size = (float)rc->param.vbv_size/8.f; |
1508 |
|
const float vbv_initial = (float)rc->param.vbv_initial/8.f; |
1509 |
|
|
1510 |
|
const float maxrate = 0.9*rc->param.vbv_maxrate; |
1511 |
|
const float vbv_low = 0.10f*vbv_size; |
1512 |
|
const float r0 = (int)(maxrate/fps+0.5)/8.f; |
1513 |
|
|
1514 |
|
int i,k,l,n,violation = 0; |
1515 |
|
float *scenefactor; |
1516 |
|
int *scenestart; |
1517 |
|
int *scenelength; |
1518 |
|
|
1519 |
|
/* first step: determine how many "scenes" there are and store their boundaries |
1520 |
|
we could get all this from existing keyframe_positions, somehow, but there we |
1521 |
|
don't have a min_scenelength, and it's no big deal to get it again. */ |
1522 |
|
|
1523 |
|
const int min_scenelength = (int)(fps+0.5); |
1524 |
|
int num_scenes = 0; |
1525 |
|
int last_scene = -999; |
1526 |
|
for (i=0; i<rc->num_frames; i++) { |
1527 |
|
if ( (rc->stats[i].type == XVID_TYPE_IVOP) && (i-last_scene>min_scenelength) ) |
1528 |
|
{ |
1529 |
|
last_scene = i; |
1530 |
|
num_scenes++; |
1531 |
|
} |
1532 |
|
} |
1533 |
|
|
1534 |
|
scenefactor = (float*)malloc( num_scenes*sizeof(float) ); |
1535 |
|
scenestart = (int*)malloc( num_scenes*sizeof(int) ); |
1536 |
|
scenelength = (int*)malloc( num_scenes*sizeof(int) ); |
1537 |
|
|
1538 |
|
if ((!scenefactor) || (!scenestart) || (!scenelength) ) |
1539 |
|
{ |
1540 |
|
free(scenefactor); |
1541 |
|
free(scenestart); |
1542 |
|
free(scenelength); |
1543 |
|
/* remember: free(0) is valid and does exactly nothing. */ |
1544 |
|
return -1; |
1545 |
|
} |
1546 |
|
|
1547 |
|
/* count again and safe the length/position */ |
1548 |
|
|
1549 |
|
num_scenes = 0; |
1550 |
|
last_scene = -999; |
1551 |
|
for (i=0; i<rc->num_frames; i++) { |
1552 |
|
if ( (rc->stats[i].type == XVID_TYPE_IVOP) && (i-last_scene>min_scenelength) ) |
1553 |
|
{ |
1554 |
|
if (num_scenes>0) |
1555 |
|
scenelength[num_scenes-1]=i-last_scene; |
1556 |
|
scenestart[num_scenes]=i; |
1557 |
|
num_scenes++; |
1558 |
|
last_scene = i; |
1559 |
|
} |
1560 |
|
} |
1561 |
|
scenelength[num_scenes-1]=i-last_scene; |
1562 |
|
|
1563 |
|
/* second step: check for each scene, how much we can scale its frames up or down |
1564 |
|
such that the VBV restriction is just fulfilled |
1565 |
|
*/ |
1566 |
|
|
1567 |
|
|
1568 |
|
#define R(k,n) (((n)+1-(k))*r0) /* how much enters the buffer between frame k and n */ |
1569 |
|
for (l=0; l<num_scenes;l++) |
1570 |
|
{ |
1571 |
|
const int start = scenestart[l]; |
1572 |
|
const int length = scenelength[l]; |
1573 |
|
twopass_stat_t * frames = &rc->stats[start]; |
1574 |
|
|
1575 |
|
float S0n,Skn; |
1576 |
|
float f,minf = 99999.f; |
1577 |
|
|
1578 |
|
S0n=0.; |
1579 |
|
for (n=0;n<=length-1;n++) |
1580 |
|
{ |
1581 |
|
S0n += frames[n].scaled_length; |
1582 |
|
|
1583 |
|
k=0; |
1584 |
|
Skn = S0n; |
1585 |
|
f = (R(k,n-1) + (vbv_initial - vbv_low)) / Skn; |
1586 |
|
if (f < minf) |
1587 |
|
minf = f; |
1588 |
|
|
1589 |
|
for (k=1;k<=n;k++) |
1590 |
|
{ |
1591 |
|
Skn -= frames[k].scaled_length; |
1592 |
|
|
1593 |
|
f = (R(k,n-1) + (vbv_size - vbv_low)) / Skn; |
1594 |
|
if (f < minf) |
1595 |
|
minf = f; |
1596 |
|
} |
1597 |
|
} |
1598 |
|
|
1599 |
|
/* special case: at the end, fill buffer up to vbv_initial again |
1600 |
|
TODO: Allow other values for buffer fill between scenes |
1601 |
|
e.g. if n=N is smallest f-value, then check for better value */ |
1602 |
|
|
1603 |
|
n=length; |
1604 |
|
k=0; |
1605 |
|
Skn = S0n; |
1606 |
|
f = R(k,n-1)/Skn; |
1607 |
|
if (f < minf) |
1608 |
|
minf = f; |
1609 |
|
|
1610 |
|
for (k=1;k<=n-1;k++) |
1611 |
|
{ |
1612 |
|
Skn -= frames[k].scaled_length; |
1613 |
|
|
1614 |
|
f = (R(k,n-1) + (vbv_initial - vbv_low)) / Skn; |
1615 |
|
if (f < minf) |
1616 |
|
minf = f; |
1617 |
|
} |
1618 |
|
|
1619 |
|
#ifdef VBV_DEBUG |
1620 |
|
printf("Scene %d (Frames %d-%d): VBVfactor %f\n", l, start, start+length-1 , minf); |
1621 |
|
#endif |
1622 |
|
|
1623 |
|
scenefactor[l] = minf; |
1624 |
|
} |
1625 |
|
#undef R |
1626 |
|
|
1627 |
|
/* last step: now we know of any scene how much it can be scaled up or down without |
1628 |
|
violating VBV. Next, distribute bits from the evil scenes to the good ones */ |
1629 |
|
|
1630 |
|
do |
1631 |
|
{ |
1632 |
|
float S_red = 0.f; /* how much to redistribute */ |
1633 |
|
float S_elig = 0.f; /* sum of bit for those scenes you can still swallow something*/ |
1634 |
|
int l; |
1635 |
|
|
1636 |
|
for (l=0;l<num_scenes;l++) /* check how much is wrong */ |
1637 |
|
{ |
1638 |
|
const int start = scenestart[l]; |
1639 |
|
const int length = scenelength[l]; |
1640 |
|
twopass_stat_t * frames = &rc->stats[start]; |
1641 |
|
|
1642 |
|
if (scenefactor[l] == 1.) /* exactly 1 means "don't touch this anymore!" */ |
1643 |
|
continue; |
1644 |
|
|
1645 |
|
if (scenefactor[l] > 1.) /* within limits */ |
1646 |
|
{ |
1647 |
|
for (n= 0; n < length; n++) |
1648 |
|
S_elig += frames[n].scaled_length; |
1649 |
|
} |
1650 |
|
else /* underflowing segment */ |
1651 |
|
{ |
1652 |
|
for (n= 0; n < length; n++) |
1653 |
|
{ |
1654 |
|
float newbytes = (float)frames[n].scaled_length * scenefactor[l]; |
1655 |
|
S_red += (float)frames[n].scaled_length - (float)newbytes; |
1656 |
|
frames[n].scaled_length =(int)newbytes; |
1657 |
|
} |
1658 |
|
scenefactor[l] = 1.f; |
1659 |
|
} |
1660 |
|
} |
1661 |
|
|
1662 |
|
if (S_red < 1.f) /* no more underflows */ |
1663 |
|
break; |
1664 |
|
|
1665 |
|
if (S_elig < 1.f) |
1666 |
|
{ |
1667 |
|
#ifdef VBV_DEBUG |
1668 |
|
fprintf(stderr,"Everything underflowing. \n"); |
1669 |
|
#endif |
1670 |
|
free(scenefactor); |
1671 |
|
free(scenestart); |
1672 |
|
free(scenelength); |
1673 |
|
return -2; |
1674 |
|
} |
1675 |
|
|
1676 |
|
const float f_red = (1.f + S_red/S_elig); |
1677 |
|
|
1678 |
|
#ifdef VBV_DEBUG |
1679 |
|
printf("Moving %.0f kB to avoid buffer underflow, correction factor: %.5f\n",S_red/1024.f,f_red); |
1680 |
|
#endif |
1681 |
|
|
1682 |
|
violation=0; |
1683 |
|
for (l=0; l<num_scenes; l++) /* scale remaining scenes up to meet total size */ |
1684 |
|
{ |
1685 |
|
const int start = scenestart[l]; |
1686 |
|
const int length = scenelength[l]; |
1687 |
|
twopass_stat_t * frames = &rc->stats[start]; |
1688 |
|
|
1689 |
|
if (scenefactor[l] == 1.) |
1690 |
|
continue; |
1691 |
|
|
1692 |
|
/* there shouldn't be any segments with factor<1 left, so all the rest is >1 */ |
1693 |
|
|
1694 |
|
for (n= 0; n < length; n++) |
1695 |
|
{ |
1696 |
|
frames[n].scaled_length = (int)(frames[n].scaled_length * f_red + 0.5); |
1697 |
|
} |
1698 |
|
|
1699 |
|
scenefactor[l] /= f_red; |
1700 |
|
if (scenefactor[l] < 1.f) |
1701 |
|
violation=1; |
1702 |
|
} |
1703 |
|
|
1704 |
|
} while (violation); |
1705 |
|
|
1706 |
|
free(scenefactor); |
1707 |
|
free(scenestart); |
1708 |
|
free(scenelength); |
1709 |
|
return 0; |
1710 |
|
} |
1711 |
|
|
1712 |
|
|
1713 |
|
/***************************************************************************** |
1714 |
* Still more low level stuff (nothing to do with stats treatment) |
* Still more low level stuff (nothing to do with stats treatment) |
1715 |
****************************************************************************/ |
****************************************************************************/ |
1716 |
|
|