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revision 1.1, Tue Mar 25 10:58:33 2003 UTC revision 1.1.2.20, Mon Jun 9 13:55:07 2003 UTC
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1    /******************************************************************************
2     *
3     *  XviD Bit Rate Controller Library
4     *  - VBR 2 pass bitrate controller implementation -
5     *
6     *  Copyright (C)      2002 Foxer <email?>
7     *                     2002 Dirk Knop <dknop@gwdg.de>
8     *                2002-2003 Edouard Gomez <ed.gomez@free.fr>
9     *                     2003 Pete Ross <pross@xvid.org>
10     *
11     *  This curve treatment algorithm is the one originally implemented by Foxer
12     *  and tuned by Dirk Knop for the XviD vfw frontend.
13     *
14     *  This program is free software; you can redistribute it and/or modify
15     *  it under the terms of the GNU General Public License as published by
16     *  the Free Software Foundation; either version 2 of the License, or
17     *  (at your option) any later version.
18     *
19     *  This program is distributed in the hope that it will be useful,
20     *  but WITHOUT ANY WARRANTY; without even the implied warranty of
21     *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
22     *  GNU General Public License for more details.
23     *
24     *  You should have received a copy of the GNU General Public License
25     *  along with this program; if not, write to the Free Software
26     *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
27     *
28     * $Id$
29     *
30     *****************************************************************************/
31    
32    #include <stdio.h>
33    #include <math.h>
34    #include <limits.h>
35    
36    #include "../xvid.h"
37    #include "../image/image.h"
38    
39    /*****************************************************************************
40     * Some constants
41     ****************************************************************************/
42    
43    #define DEFAULT_KEYFRAME_BOOST 0
44    #define DEFAULT_PAYBACK_METHOD XVID_PAYBACK_PROP
45    #define DEFAULT_BITRATE_PAYBACK_DELAY 250
46    #define DEFAULT_CURVE_COMPRESSION_HIGH 0
47    #define DEFAULT_CURVE_COMPRESSION_LOW 0
48    #define DEFAULT_MAX_OVERFLOW_IMPROVEMENT 60
49    #define DEFAULT_MAX_OVERFLOW_DEGRADATION 60
50    
51    /* Keyframe settings */
52    #define DEFAULT_KFTRESHOLD 10
53    #define DEFAULT_KFREDUCTION 20
54    #define DEFAULT_MIN_KEY_INTERVAL 1
55    
56    /*****************************************************************************
57     * Structures
58     ****************************************************************************/
59    
60    /* Statistics */
61    typedef struct {
62        int type;               /* first pass type */
63        int quant;              /* first pass quant */
64            int blks[3];                    /* k,m,y blks */
65        int length;             /* first pass length */
66        int scaled_length;      /* scaled length */
67        int desired_length;     /* desired length; calcuated during encoding */
68    
69        int zone_mode;   /* XVID_ZONE_xxx */
70        double weight;
71    } stat_t;
72    
73    /* Context struct */
74    typedef struct
75    {
76        xvid_plugin_2pass2_t param;
77    
78        /* constant statistical data */
79            int num_frames;
80            int num_keyframes;
81            uint64_t target;        /* target filesize */
82    
83            int count[3];   /* count of each frame types */
84            uint64_t tot_length[3];  /* total length of each frame types */
85            double avg_length[3];   /* avg */
86            int min_length[3];  /* min frame length of each frame types */
87            uint64_t tot_scaled_length[3];  /* total scaled length of each frame type */
88            int max_length;     /* max frame size */
89    
90            /* zone statistical data */
91            double avg_weight;  /* average weight */
92            int64_t tot_quant;   /* total length used by XVID_ZONE_QUANT zones */
93    
94    
95            double curve_comp_scale;
96            double movie_curve;
97    
98            /* dynamic */
99    
100            int * keyframe_locations;
101            stat_t * stats;
102    
103            double quant_error[3][32];
104            int quant_count[32];
105            int last_quant[3];
106    
107            double curve_comp_error;
108            int overflow;
109            int KFoverflow;
110            int KFoverflow_partial;
111            int KF_idx;
112    
113            double fq_error;
114    } rc_2pass2_t;
115    
116    
117    /*****************************************************************************
118     * Sub plugin functions prototypes
119     ****************************************************************************/
120    
121    static int rc_2pass2_create(xvid_plg_create_t * create, rc_2pass2_t ** handle);
122    static int rc_2pass2_before(rc_2pass2_t * rc, xvid_plg_data_t * data);
123    static int rc_2pass2_after(rc_2pass2_t * rc, xvid_plg_data_t * data);
124    static int rc_2pass2_destroy(rc_2pass2_t * rc, xvid_plg_destroy_t * destroy);
125    
126    /*****************************************************************************
127     * Plugin definition
128     ****************************************************************************/
129    
130    int
131    xvid_plugin_2pass2(void * handle, int opt, void * param1, void * param2)
132    {
133        switch(opt) {
134        case XVID_PLG_INFO :
135            return 0;
136    
137        case XVID_PLG_CREATE :
138            return rc_2pass2_create((xvid_plg_create_t*)param1, param2);
139    
140        case XVID_PLG_DESTROY :
141            return rc_2pass2_destroy((rc_2pass2_t*)handle, (xvid_plg_destroy_t*)param1);
142    
143        case XVID_PLG_BEFORE :
144            return rc_2pass2_before((rc_2pass2_t*)handle, (xvid_plg_data_t*)param1);
145    
146        case XVID_PLG_AFTER :
147            return rc_2pass2_after((rc_2pass2_t*)handle, (xvid_plg_data_t*)param1);
148        }
149    
150        return XVID_ERR_FAIL;
151    }
152    
153    /*****************************************************************************
154     * Sub plugin functions definitions
155     ****************************************************************************/
156    
157    /* First a few local helping function prototypes */
158    static  int det_stats_length(rc_2pass2_t * rc, char * filename);
159    static  int load_stats(rc_2pass2_t *rc, char * filename);
160    static void zone_process(rc_2pass2_t *rc, const xvid_plg_create_t * create);
161    static void internal_scale(rc_2pass2_t *rc);
162    static void pre_process0(rc_2pass2_t * rc);
163    static void pre_process1(rc_2pass2_t * rc);
164    
165    /*----------------------------------------------------------------------------
166     *--------------------------------------------------------------------------*/
167    
168    static int
169    rc_2pass2_create(xvid_plg_create_t * create, rc_2pass2_t **handle)
170    {
171        xvid_plugin_2pass2_t * param = (xvid_plugin_2pass2_t *)create->param;
172        rc_2pass2_t * rc;
173        int i;
174    
175        rc = malloc(sizeof(rc_2pass2_t));
176        if (rc == NULL)
177            return XVID_ERR_MEMORY;
178    
179        rc->param = *param;
180    
181            /*
182             * Initialize all defaults
183             */
184    #define _INIT(a, b) if((a) <= 0) (a) = (b)
185        /* Let's set our defaults if needed */
186            _INIT(rc->param.keyframe_boost, DEFAULT_KEYFRAME_BOOST);
187            _INIT(rc->param.payback_method, DEFAULT_PAYBACK_METHOD);
188            _INIT(rc->param.bitrate_payback_delay, DEFAULT_BITRATE_PAYBACK_DELAY);
189        _INIT(rc->param.curve_compression_high, DEFAULT_CURVE_COMPRESSION_HIGH);
190        _INIT(rc->param.curve_compression_low, DEFAULT_CURVE_COMPRESSION_LOW);
191        _INIT(rc->param.max_overflow_improvement, DEFAULT_MAX_OVERFLOW_IMPROVEMENT);
192        _INIT(rc->param.max_overflow_degradation,  DEFAULT_MAX_OVERFLOW_DEGRADATION);
193    
194        /* Keyframe settings */
195            _INIT(rc->param.kftreshold, DEFAULT_KFTRESHOLD);
196        _INIT(rc->param.kfreduction, DEFAULT_KFREDUCTION);
197        _INIT(rc->param.min_key_interval, DEFAULT_MIN_KEY_INTERVAL);
198    #undef _INIT
199    
200            /* Initialize some stuff to zero */
201            for(i=0; i<32; i++) rc->quant_count[i] = 0;
202    
203            for(i=0; i<3; i++) {
204                    int j;
205                    for (j=0; j<32; j++)
206                            rc->quant_error[i][j] = 0;
207            }
208    
209            for (i=0; i<3; i++)
210                    rc->last_quant[i] = 0;
211    
212            rc->fq_error = 0;
213    
214            /* Count frames in the stats file */
215            if (!det_stats_length(rc, param->filename)) {
216                    DPRINTF(XVID_DEBUG_RC,"ERROR: fopen %s failed\n", param->filename);
217                    free(rc);
218                    return XVID_ERR_FAIL;
219            }
220    
221        /* Allocate the stats' memory */
222            if ((rc->stats = malloc(rc->num_frames * sizeof(stat_t))) == NULL) {
223            free(rc);
224            return XVID_ERR_MEMORY;
225        }
226    
227        /*
228             * Allocate keyframes location's memory
229             * PS: see comment in pre_process0 for the +1 location requirement
230             */
231            rc->keyframe_locations = malloc((rc->num_keyframes + 1) * sizeof(int));
232            if (rc->keyframe_locations == NULL) {
233                    free(rc->stats);
234                    free(rc);
235                    return XVID_ERR_MEMORY;
236            }
237    
238            if (!load_stats(rc, param->filename)) {
239                    DPRINTF(XVID_DEBUG_RC,"ERROR: fopen %s failed\n", param->filename);
240                    free(rc->keyframe_locations);
241                    free(rc->stats);
242                    free(rc);
243                    return XVID_ERR_FAIL;
244            }
245    
246            /* Compute the target filesize */
247            if (rc->num_frames  < create->fbase/create->fincr) {
248                    /* Source sequence is less than 1s long, we do as if it was 1s long */
249                    rc->target = rc->param.bitrate / 8;
250            } else {
251                    /* Target filesize = bitrate/8 * numframes / framerate */
252                    rc->target =
253                            ((uint64_t)rc->param.bitrate * (uint64_t)rc->num_frames * \
254                             (uint64_t)create->fincr) / \
255                            ((uint64_t)create->fbase * 8);
256            }
257    
258            DPRINTF(XVID_DEBUG_RC, "Frame rate: %d/%d (%ffps)\n",
259                            create->fbase, create->fincr,
260                            (double)create->fbase/(double)create->fincr);
261            DPRINTF(XVID_DEBUG_RC, "Number of frames: %d\n", rc->num_frames);
262            DPRINTF(XVID_DEBUG_RC, "Target bitrate: %ld\n", rc->param.bitrate);
263            DPRINTF(XVID_DEBUG_RC, "Target filesize: %lld\n", rc->target);
264    
265            /* Compensate the average frame overhead caused by the container */
266            rc->target -= rc->num_frames*rc->param.container_frame_overhead;
267            DPRINTF(XVID_DEBUG_RC, "Container Frame overhead: %d\n", rc->param.container_frame_overhead);
268            DPRINTF(XVID_DEBUG_RC, "Target filesize (after container compensation): %lld\n", rc->target);
269    
270            /*
271             * First data pre processing:
272             *  - finds the minimum frame length for each frame type during 1st pass.
273             *     rc->min_size[]
274             *  - determines the maximum frame length observed (no frame type distinction).
275             *     rc->max_size
276             *  - count how many times each frame type has been used.
277             *     rc->count[]
278             *  - total bytes used per frame type
279             *     rc->total[]
280             *  - store keyframe location
281             *     rc->keyframe_locations[]
282             */
283            pre_process0(rc);
284    
285            /*
286             * When bitrate is not given it means it has been scaled by an external
287             * application
288             */
289            if (rc->param.bitrate) {
290                    /* Apply zone settings */
291                    zone_process(rc, create);
292                    /* Perform curve scaling */
293                    internal_scale(rc);
294            } else {
295                    /* External scaling -- zones are ignored */
296                    for (i=0;i<rc->num_frames;i++) {
297                            rc->stats[i].zone_mode = XVID_ZONE_WEIGHT;
298                            rc->stats[i].weight = 1.0;
299                    }
300                    rc->avg_weight = 1.0;
301                    rc->tot_quant = 0;
302            }
303    
304            pre_process1(rc);
305    
306            *handle = rc;
307            return(0);
308    }
309    
310    /*----------------------------------------------------------------------------
311     *--------------------------------------------------------------------------*/
312    
313    static int
314    rc_2pass2_destroy(rc_2pass2_t * rc, xvid_plg_destroy_t * destroy)
315    {
316        free(rc->keyframe_locations);
317        free(rc->stats);
318            free(rc);
319            return(0);
320    }
321    
322    /*----------------------------------------------------------------------------
323     *--------------------------------------------------------------------------*/
324    
325    static int
326    rc_2pass2_before(rc_2pass2_t * rc, xvid_plg_data_t * data)
327    {
328            stat_t * s = &rc->stats[data->frame_num];
329            int overflow;
330            int desired;
331            double dbytes;
332            double curve_temp;
333            double scaled_quant;
334            int capped_to_max_framesize = 0;
335    
336            /*
337             * This function is quite long but easy to understand. In order to simplify
338             * the code path (a bit), we treat 3 cases that can return immediatly.
339             */
340    
341            /* First case: Another plugin has already set a quantizer */
342        if (data->quant > 0)
343                    return(0);
344    
345            /* Second case: We are in a Quant zone */
346            if (s->zone_mode == XVID_ZONE_QUANT) {
347                    rc->fq_error += s->weight;
348                    data->quant = (int)rc->fq_error;
349                    rc->fq_error -= data->quant;
350    
351                    s->desired_length = s->length;
352    
353                    return(0);
354            }
355    
356            /* Third case: insufficent stats data */
357            if (data->frame_num >= rc->num_frames)
358                    return 0;
359    
360            /* XXX: why by 8 */
361            overflow = rc->overflow / 8;
362    
363            /*
364             * The rc->overflow field represents the overflow in current scene (between two
365             * IFrames) so we must not forget to reset it if we are entering a new scene
366             */
367            if (s->type == XVID_TYPE_IVOP)
368                    overflow = 0;
369    
370            desired = s->scaled_length;
371    
372            dbytes = desired;
373            if (s->type == XVID_TYPE_IVOP)
374                    dbytes += desired * rc->param.keyframe_boost / 100;
375            dbytes /= rc->movie_curve;
376    
377            /*
378             * Apply user's choosen Payback method. Payback helps bitrate to follow the
379             * scaled curve "paying back" past errors in curve previsions.
380             */
381            if (rc->param.payback_method == XVID_PAYBACK_BIAS) {
382                    desired = (int)(rc->curve_comp_error / rc->param.bitrate_payback_delay);
383            } else {
384                    desired = (int)(rc->curve_comp_error * dbytes /
385                                                    rc->avg_length[s->type-1] / rc->param.bitrate_payback_delay);
386    
387                    if (labs(desired) > fabs(rc->curve_comp_error))
388                            desired = (int)rc->curve_comp_error;
389            }
390    
391            rc->curve_comp_error -= desired;
392    
393            /* XXX: warning */
394            curve_temp = 0;
395    
396            if ((rc->param.curve_compression_high + rc->param.curve_compression_low) &&     s->type != XVID_TYPE_IVOP) {
397    
398                    curve_temp = rc->curve_comp_scale;
399                    if (dbytes > rc->avg_length[s->type-1]) {
400                            curve_temp *= ((double)dbytes + (rc->avg_length[s->type-1] - dbytes) * rc->param.curve_compression_high / 100.0);
401                    } else {
402                            curve_temp *= ((double)dbytes + (rc->avg_length[s->type-1] - dbytes) * rc->param.curve_compression_low / 100.0);
403                    }
404    
405                    desired += (int)curve_temp;
406                    rc->curve_comp_error += curve_temp - (int)curve_temp;
407            } else {
408                    desired += (int)dbytes;
409                    rc->curve_comp_error += dbytes - (int)dbytes;
410            }
411    
412    
413            /*
414             * We can't do bigger frames than first pass, this would be stupid as first
415             * pass is quant=2 and that reaching quant=1 is not worth it. We would lose
416             * many bytes and we would not not gain much quality.
417             */
418            if (desired > s->length) {
419                    rc->curve_comp_error += desired - s->length;
420                    desired = s->length;
421            } else {
422                    if (desired < rc->min_length[s->type-1]) {
423                            if (s->type == XVID_TYPE_IVOP){
424                                    rc->curve_comp_error -= rc->min_length[XVID_TYPE_IVOP-1] - desired;
425                            }
426                            desired = rc->min_length[s->type-1];
427                    }
428            }
429    
430            s->desired_length = desired;
431    
432            /*
433             * if this keyframe is too close to the next, reduce it's byte allotment
434             * XXX: why do we do this after setting the desired length ?
435             */
436    
437            if (s->type == XVID_TYPE_IVOP) {
438                    int KFdistance = rc->keyframe_locations[rc->KF_idx] - rc->keyframe_locations[rc->KF_idx - 1];
439    
440                    if (KFdistance < rc->param.kftreshold) {
441    
442                            KFdistance -= rc->param.min_key_interval;
443    
444                            if (KFdistance >= 0) {
445                                    int KF_min_size;
446    
447                                    KF_min_size = desired * (100 - rc->param.kfreduction) / 100;
448                                    if (KF_min_size < 1)
449                                            KF_min_size = 1;
450    
451                                    desired = KF_min_size + (desired - KF_min_size) * KFdistance /
452                                            (rc->param.kftreshold - rc->param.min_key_interval);
453    
454                                    if (desired < 1)
455                                            desired = 1;
456                            }
457                    }
458            }
459    
460            /*
461             * The "sens commun" would force us to use rc->avg_length[s->type-1] but
462             * even VFW code uses the pframe average length. Note that this length is
463             * used with desired which represents bframes _and_ pframes length.
464             *
465             * XXX: why are we using the avg pframe length for all frame types ?
466             */
467            overflow = (int)((double)overflow * desired / rc->avg_length[XVID_TYPE_PVOP-1]);
468    
469            /* Reign in overflow with huge frames */
470            if (labs(overflow) > labs(rc->overflow))
471                    overflow = rc->overflow;
472    
473            /* Make sure overflow doesn't run away */
474            if (overflow > desired * rc->param.max_overflow_improvement / 100) {
475                    desired += (overflow <= desired) ? desired * rc->param.max_overflow_improvement / 100 :
476                            overflow * rc->param.max_overflow_improvement / 100;
477            } else if (overflow < desired * rc->param.max_overflow_degradation / -100){
478                    desired += desired * rc->param.max_overflow_degradation / -100;
479            } else {
480                    desired += overflow;
481            }
482    
483            /* Make sure we are not higher than desired frame size */
484            if (desired > rc->max_length) {
485                    capped_to_max_framesize = 1;
486                    desired = rc->max_length;
487                    DPRINTF(XVID_DEBUG_RC,"[%i] Capped to maximum frame size\n",
488                                    data->frame_num);
489            }
490    
491            /* Make sure to not scale below the minimum framesize */
492            if (desired < rc->min_length[s->type-1]) {
493                    desired = rc->min_length[s->type-1];
494                    DPRINTF(XVID_DEBUG_RC,"[%i] Capped to minimum frame size\n",
495                                    data->frame_num);
496            }
497    
498            /*
499             * Don't laugh at this very 'simple' quant<->filesize relationship, it
500             * proves to be acurate enough for our algorithm
501             */
502            scaled_quant = (double)s->quant*(double)s->length/(double)desired;
503    
504            /*
505             * Quantizer has been scaled using floating point operations/results, we
506             * must cast it to integer
507             */
508            data->quant = (int)scaled_quant;
509    
510            /* Let's clip the computed quantizer, if needed */
511            if (data->quant < 1) {
512                    data->quant = 1;
513            } else if (data->quant > 31) {
514                    data->quant = 31;
515            } else if (s->type != XVID_TYPE_IVOP) {
516    
517                    /*
518                     * The frame quantizer has not been clipped, this appears to be a good
519                     * computed quantizer, do not loose quantizer decimal part that we
520                     * accumulate for later reuse when its sum represents a complete unit.
521                     */
522                    rc->quant_error[s->type-1][data->quant] += scaled_quant - (double)data->quant;
523    
524                    if (rc->quant_error[s->type-1][data->quant] >= 1.0) {
525                            rc->quant_error[s->type-1][data->quant] -= 1.0;
526                            data->quant++;
527                    } else if (rc->quant_error[s->type-1][data->quant] <= -1.0) {
528                            rc->quant_error[s->type-1][data->quant] += 1.0;
529                            data->quant--;
530                    }
531    
532            }
533    
534            /*
535             * Now we have a computed quant that is in the right quante range, with a
536             * possible +1 correction due to cumulated error. We can now safely clip
537             * the quantizer again with user's quant ranges. "Safely" means the Rate
538             * Control could learn more about this quantizer, this knowledge is useful
539             * for future frames even if it this quantizer won't be really used atm,
540             * that's why we don't perform this clipping earlier.
541             */
542            if (data->quant < data->min_quant[s->type-1]) {
543                    data->quant = data->min_quant[s->type-1];
544            } else if (data->quant > data->max_quant[s->type-1]) {
545                    data->quant = data->max_quant[s->type-1];
546            }
547    
548            /*
549             * To avoid big quality jumps from frame to frame, we apply a "security"
550             * rule that makes |last_quant - new_quant| <= 2. This rule only applies
551             * to predicted frames (P and B)
552             */
553            if (s->type != XVID_TYPE_IVOP && rc->last_quant[s->type-1] && capped_to_max_framesize == 0) {
554    
555                    if (data->quant > rc->last_quant[s->type-1] + 2) {
556                            data->quant = rc->last_quant[s->type-1] + 2;
557                            DPRINTF(XVID_DEBUG_RC,
558                                            "[%i] p/b-frame quantizer prevented from rising too steeply\n",
559                                            data->frame_num);
560                    }
561                    if (data->quant < rc->last_quant[s->type-1] - 2) {
562                            data->quant = rc->last_quant[s->type-1] - 2;
563                            DPRINTF(XVID_DEBUG_RC,
564                                            "[%i] p/b-frame quantizer prevented from falling too steeply\n",
565                                            data->frame_num);
566                    }
567            }
568    
569            /*
570             * We don't want to pollute the RC history results when our computed quant
571             * has been computed from a capped frame size
572             */
573            if (capped_to_max_framesize == 0)
574                    rc->last_quant[s->type-1] = data->quant;
575    
576            /* Force frame type */
577            data->type = s->type;
578    
579            return 0;
580    }
581    
582    /*----------------------------------------------------------------------------
583     *--------------------------------------------------------------------------*/
584    
585    static int
586    rc_2pass2_after(rc_2pass2_t * rc, xvid_plg_data_t * data)
587    {
588            const char frame_type[4] = { 'i', 'p', 'b', 's'};
589            stat_t * s = &rc->stats[data->frame_num];
590    
591            /* Insufficent stats data */
592        if (data->frame_num >= rc->num_frames)
593            return 0;
594    
595        rc->quant_count[data->quant]++;
596    
597        if (data->type == XVID_TYPE_IVOP) {
598            int kfdiff = (rc->keyframe_locations[rc->KF_idx] -      rc->keyframe_locations[rc->KF_idx - 1]);
599    
600            rc->overflow += rc->KFoverflow;
601            rc->KFoverflow = s->desired_length - data->length;
602    
603            if (kfdiff > 1) {  /* non-consecutive keyframes */
604                rc->KFoverflow_partial = rc->KFoverflow / (kfdiff - 1);
605            }else{ /* consecutive keyframes */
606                            rc->overflow += rc->KFoverflow;
607                            rc->KFoverflow = 0;
608                            rc->KFoverflow_partial = 0;
609            }
610            rc->KF_idx++;
611        } else {
612            /* distribute part of the keyframe overflow */
613            rc->overflow += s->desired_length - data->length + rc->KFoverflow_partial;
614            rc->KFoverflow -= rc->KFoverflow_partial;
615        }
616    
617            DPRINTF(XVID_DEBUG_RC, "[%i] type:%c quant:%i stats1:%i scaled:%i actual:%i desired:%d overflow:%i\n",
618                            data->frame_num,
619                            frame_type[data->type-1],
620                            data->quant,
621                            s->length,
622                            s->scaled_length,
623                            data->length,
624                            s->desired_length,
625                            rc->overflow);
626    
627        return(0);
628    }
629    
630    /*****************************************************************************
631     * Helper functions definition
632     ****************************************************************************/
633    
634    #define BUF_SZ   1024
635    #define MAX_COLS 5
636    
637    /* open stats file, and count num frames */
638    static int
639    det_stats_length(rc_2pass2_t * rc, char * filename)
640    {
641        FILE * f;
642        int n, ignore;
643        char type;
644    
645        rc->num_frames = 0;
646        rc->num_keyframes = 0;
647    
648        if ((f = fopen(filename, "rt")) == NULL)
649            return 0;
650    
651        while((n = fscanf(f, "%c %d %d %d %d %d %d\n",
652            &type, &ignore, &ignore, &ignore, &ignore, &ignore, &ignore)) != EOF) {
653            if (type == 'i') {
654                rc->num_frames++;
655                rc->num_keyframes++;
656            }else if (type == 'p' || type == 'b' || type == 's') {
657                rc->num_frames++;
658            }
659        }
660    
661        fclose(f);
662    
663        return 1;
664    }
665    
666    /* open stats file(s) and read into rc->stats array */
667    
668    static int
669    load_stats(rc_2pass2_t *rc, char * filename)
670    {
671        FILE * f;
672        int i, not_scaled;
673    
674    
675        if ((f = fopen(filename, "rt"))==NULL)
676            return 0;
677    
678        i = 0;
679            not_scaled = 0;
680        while(i < rc->num_frames) {
681            stat_t * s = &rc->stats[i];
682            int n;
683            char type;
684    
685                    s->scaled_length = 0;
686            n = fscanf(f, "%c %d %d %d %d %d %d\n", &type, &s->quant, &s->blks[0], &s->blks[1], &s->blks[2], &s->length, &s->scaled_length);
687            if (n == EOF) break;
688                    if (n < 7) {
689                            not_scaled = 1;
690                    }
691    
692            if (type == 'i') {
693                s->type = XVID_TYPE_IVOP;
694            }else if (type == 'p' || type == 's') {
695                s->type = XVID_TYPE_PVOP;
696            }else if (type == 'b') {
697                s->type = XVID_TYPE_BVOP;
698            }else{  /* unknown type */
699                DPRINTF(XVID_DEBUG_RC, "WARNING: unknown stats frame type, assuming pvop\n");
700                s->type = XVID_TYPE_PVOP;
701            }
702    
703            i++;
704        }
705    
706        rc->num_frames = i;
707    
708            fclose(f);
709    
710        return 1;
711    }
712    
713    #if 0
714    static void print_stats(rc_2pass2_t * rc)
715    {
716        int i;
717        DPRINTF(XVID_DEBUG_RC, "type quant length scaled_length\n");
718            for (i = 0; i < rc->num_frames; i++) {
719            stat_t * s = &rc->stats[i];
720            DPRINTF(XVID_DEBUG_RC, "%d %d %d %d\n", s->type, s->quant, s->length, s->scaled_length);
721        }
722    }
723    #endif
724    
725    /* pre-process the statistics data
726        - for each type, count, tot_length, min_length, max_length
727        - set keyframes_locations
728    */
729    
730    static void
731    pre_process0(rc_2pass2_t * rc)
732    {
733        int i,j;
734    
735            /*
736             * *rc fields initialization
737             * NB: INT_MAX and INT_MIN are used in order to be immediately replaced
738             *     with real values of the 1pass
739             */
740             for (i=0; i<3; i++) {
741                    rc->count[i]=0;
742                    rc->tot_length[i] = 0;
743                    rc->min_length[i] = INT_MAX;
744        }
745    
746            rc->max_length = INT_MIN;
747    
748            /*
749             * Loop through all frames and find/compute all the stuff this function
750             * is supposed to do
751             */
752            for (i=j=0; i<rc->num_frames; i++) {
753                    stat_t * s = &rc->stats[i];
754    
755                    rc->count[s->type-1]++;
756                    rc->tot_length[s->type-1] += s->length;
757    
758                    if (s->length < rc->min_length[s->type-1]) {
759                            rc->min_length[s->type-1] = s->length;
760                    }
761    
762                    if (s->length > rc->max_length) {
763                            rc->max_length = s->length;
764                    }
765    
766                    if (s->type == XVID_TYPE_IVOP) {
767                            rc->keyframe_locations[j] = i;
768                            j++;
769                    }
770            }
771    
772            /*
773             * Nota Bene:
774             * The "per sequence" overflow system considers a natural sequence to be
775             * formed by all frames between two iframes, so if we want to make sure
776             * the system does not go nuts during last sequence, we force the last
777             * frame to appear in the keyframe locations array.
778             */
779        rc->keyframe_locations[j] = i;
780    
781            DPRINTF(XVID_DEBUG_RC, "Min 1st pass IFrame length: %d\n", rc->min_length[0]);
782            DPRINTF(XVID_DEBUG_RC, "Min 1st pass PFrame length: %d\n", rc->min_length[1]);
783            DPRINTF(XVID_DEBUG_RC, "Min 1st pass BFrame length: %d\n", rc->min_length[2]);
784    }
785    
786    /* calculate zone weight "center" */
787    
788    static void
789    zone_process(rc_2pass2_t *rc, const xvid_plg_create_t * create)
790    {
791        int i,j;
792        int n = 0;
793    
794        rc->avg_weight = 0.0;
795        rc->tot_quant = 0;
796    
797    
798        if (create->num_zones == 0) {
799            for (j = 0; j < rc->num_frames; j++) {
800                rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;
801                rc->stats[j].weight = 1.0;
802            }
803            rc->avg_weight += rc->num_frames * 1.0;
804            n += rc->num_frames;
805        }
806    
807    
808        for(i=0; i < create->num_zones; i++) {
809    
810            int next = (i+1<create->num_zones) ? create->zones[i+1].frame : rc->num_frames;
811    
812            if (i==0 && create->zones[i].frame > 0) {
813                for (j = 0; j < create->zones[i].frame && j < rc->num_frames; j++) {
814                    rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;
815                    rc->stats[j].weight = 1.0;
816                }
817                rc->avg_weight += create->zones[i].frame * 1.0;
818                n += create->zones[i].frame;
819            }
820    
821            if (create->zones[i].mode == XVID_ZONE_WEIGHT) {
822                for (j = create->zones[i].frame; j < next && j < rc->num_frames; j++ ) {
823                    rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;
824                    rc->stats[j].weight = (double)create->zones[i].increment / (double)create->zones[i].base;
825                }
826                next -= create->zones[i].frame;
827                rc->avg_weight += (double)(next * create->zones[i].increment) / (double)create->zones[i].base;
828                n += next;
829            }else{  /* XVID_ZONE_QUANT */
830                for (j = create->zones[i].frame; j < next && j < rc->num_frames; j++ ) {
831                    rc->stats[j].zone_mode = XVID_ZONE_QUANT;
832                    rc->stats[j].weight = (double)create->zones[i].increment / (double)create->zones[i].base;
833                    rc->tot_quant += rc->stats[j].length;
834                }
835            }
836        }
837        rc->avg_weight = n>0 ? rc->avg_weight/n : 1.0;
838    
839        DPRINTF(XVID_DEBUG_RC, "center_weight: %f (for %i frames);   fixed_bytes: %i\n", rc->avg_weight, n, rc->tot_quant);
840    }
841    
842    
843    /* scale the curve */
844    
845    static void
846    internal_scale(rc_2pass2_t *rc)
847    {
848            int64_t target  = rc->target - rc->tot_quant;
849            int64_t pass1_length = rc->tot_length[0] + rc->tot_length[1] + rc->tot_length[2] - rc->tot_quant;
850            double scaler;
851            int i, num_MBs;
852    
853            /* Let's compute a linear scaler in order to perform curve scaling */
854            scaler = (double)target / (double)pass1_length;
855    
856            if (target <= 0 || pass1_length <= 0 || target >= pass1_length) {
857                    DPRINTF(XVID_DEBUG_RC, "WARNING: Undersize detected\n");
858            scaler = 1.0;
859            }
860    
861        DPRINTF(XVID_DEBUG_RC,
862                            "Before correction: target=%i, tot_length=%i, scaler=%f\n",
863                            (int)target, (int)pass1_length, scaler);
864    
865            /*
866             * Compute min frame lengths (for each frame type) according to the number
867             * of MBs. We sum all blocks count from frame 0 (should be an IFrame, so
868             * blocks[0] should be enough) to know how many MBs there are.
869             *
870             * We compare these hardcoded values with observed values in first pass
871             * (determined in pre_process0).Then we keep the real minimum.
872             */
873            num_MBs = rc->stats[0].blks[0] + rc->stats[0].blks[1] + rc->stats[0].blks[2];
874    
875            if(rc->min_length[0] > ((num_MBs*22) + 240) / 8)
876                    rc->min_length[0] = ((num_MBs*22) + 240) / 8;
877    
878            if(rc->min_length[1] > ((num_MBs) + 88)  / 8)
879                    rc->min_length[1] = ((num_MBs) + 88)  / 8;
880    
881            if(rc->min_length[2] > 8)
882                    rc->min_length[2] = 8;
883    
884            /*
885             * Perform an initial scale pass.
886             * If a frame size is scaled underneath our hardcoded minimums, then we
887             * force the frame size to the minimum, and deduct the original & scaled
888             * frame length from the original and target total lengths
889             */
890            for (i=0; i<rc->num_frames; i++) {
891                    stat_t * s = &rc->stats[i];
892                    int len;
893    
894            if (s->zone_mode == XVID_ZONE_QUANT) {
895                s->scaled_length = s->length;
896                            continue;
897                    }
898    
899                    /* Compute the scaled length */
900                    len = (int)((double)s->length * scaler * s->weight / rc->avg_weight);
901    
902                    /* Compare with the computed minimum */
903                    if (len < rc->min_length[s->type-1]) {
904                            /* force frame size to our computed minimum */
905                            s->scaled_length = rc->min_length[s->type-1];
906                            target -= s->scaled_length;
907                            pass1_length -= s->length;
908                    } else {
909                            /* Do nothing for now, we'll scale this later */
910                            s->scaled_length = 0;
911                    }
912            }
913    
914            /* Correct the scaler for all non forced frames */
915            scaler = (double)target / (double)pass1_length;
916    
917            /* Detect undersizing */
918        if (target <= 0 || pass1_length <= 0 || target >= pass1_length) {
919                    DPRINTF(XVID_DEBUG_RC, "WARNING: Undersize detected\n");
920                    scaler = 1.0;
921            }
922    
923            DPRINTF(XVID_DEBUG_RC,
924                            "After correction: target=%i, tot_length=%i, scaler=%f\n",
925                            (int)target, (int)pass1_length, scaler);
926    
927            /* Do another pass with the new scaler */
928            for (i=0; i<rc->num_frames; i++) {
929                    stat_t * s = &rc->stats[i];
930    
931                    /* Ignore frame with forced frame sizes */
932                    if (s->scaled_length == 0)
933                            s->scaled_length = (int)((double)s->length * scaler * s->weight / rc->avg_weight);
934            }
935    }
936    
937    static void
938    pre_process1(rc_2pass2_t * rc)
939    {
940        int i;
941        double total1, total2;
942        uint64_t ivop_boost_total;
943    
944        ivop_boost_total = 0;
945        rc->curve_comp_error = 0;
946    
947        for (i=0; i<3; i++) {
948            rc->tot_scaled_length[i] = 0;
949        }
950    
951        for (i=0; i<rc->num_frames; i++) {
952            stat_t * s = &rc->stats[i];
953    
954            rc->tot_scaled_length[s->type-1] += s->scaled_length;
955    
956            if (s->type == XVID_TYPE_IVOP) {
957                ivop_boost_total += s->scaled_length * rc->param.keyframe_boost / 100;
958            }
959        }
960    
961        rc->movie_curve = ((double)(rc->tot_scaled_length[XVID_TYPE_PVOP-1] + rc->tot_scaled_length[XVID_TYPE_BVOP-1] + ivop_boost_total) /
962                                            (rc->tot_scaled_length[XVID_TYPE_PVOP-1] + rc->tot_scaled_length[XVID_TYPE_BVOP-1]));
963    
964        for(i=0; i<3; i++) {
965            if (rc->count[i] == 0 || rc->movie_curve == 0) {
966                rc->avg_length[i] = 1;
967            }else{
968                rc->avg_length[i] = rc->tot_scaled_length[i] / rc->count[i] / rc->movie_curve;
969            }
970        }
971    
972        /* --- */
973    
974        total1=total2=0;
975    
976        for (i=0; i<rc->num_frames; i++) {
977            stat_t * s = &rc->stats[i];
978    
979            if (s->type != XVID_TYPE_IVOP) {
980                double dbytes,dbytes2;
981    
982                dbytes = s->scaled_length / rc->movie_curve;
983                dbytes2 = 0; /* XXX: warning */
984                total1 += dbytes;
985    
986                            if (dbytes > rc->avg_length[s->type-1]) {
987                                    dbytes2=((double)dbytes + (rc->avg_length[s->type-1] - dbytes) * rc->param.curve_compression_high / 100.0);
988                            } else {
989                                    dbytes2 = ((double)dbytes + (rc->avg_length[s->type-1] - dbytes) * rc->param.curve_compression_low / 100.0);
990                            }
991    
992                            if (dbytes2 < rc->min_length[s->type-1])
993                                        dbytes2 = rc->min_length[s->type-1];
994    
995                total2 += dbytes2;
996            }
997        }
998    
999        rc->curve_comp_scale = total1 / total2;
1000    
1001            DPRINTF(XVID_DEBUG_RC, "middle frame size for asymmetric curve compression: pframe%d bframe:%d\n",
1002                (int)(rc->avg_length[XVID_TYPE_PVOP-1] * rc->curve_comp_scale),
1003                            (int)(rc->avg_length[XVID_TYPE_BVOP-1] * rc->curve_comp_scale));
1004    
1005        rc->overflow = 0;
1006        rc->KFoverflow = 0;
1007        rc->KFoverflow_partial = 0;
1008        rc->KF_idx = 1;
1009    }
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