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revision 1.1, Tue Mar 25 10:58:33 2003 UTC revision 1.1.2.21, Tue Jun 10 10:12:24 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->param.bitrate<0) {
248            /* if negative, bitrate equals the target (int kbytes) */
249            rc->target = (-rc->param.bitrate) * 1024;
250    
251        }else if (rc->num_frames  < create->fbase/create->fincr) {
252                    /* Source sequence is less than 1s long, we do as if it was 1s long */
253                    rc->target = rc->param.bitrate / 8;
254            } else {
255                    /* Target filesize = bitrate/8 * numframes / framerate */
256                    rc->target =
257                            ((uint64_t)rc->param.bitrate * (uint64_t)rc->num_frames * \
258                             (uint64_t)create->fincr) / \
259                            ((uint64_t)create->fbase * 8);
260            }
261    
262            DPRINTF(XVID_DEBUG_RC, "Frame rate: %d/%d (%ffps)\n",
263                            create->fbase, create->fincr,
264                            (double)create->fbase/(double)create->fincr);
265            DPRINTF(XVID_DEBUG_RC, "Number of frames: %d\n", rc->num_frames);
266            DPRINTF(XVID_DEBUG_RC, "Target bitrate: %ld\n", rc->param.bitrate);
267            DPRINTF(XVID_DEBUG_RC, "Target filesize: %lld\n", rc->target);
268    
269            /* Compensate the average frame overhead caused by the container */
270            rc->target -= rc->num_frames*rc->param.container_frame_overhead;
271            DPRINTF(XVID_DEBUG_RC, "Container Frame overhead: %d\n", rc->param.container_frame_overhead);
272            DPRINTF(XVID_DEBUG_RC, "Target filesize (after container compensation): %lld\n", rc->target);
273    
274            /*
275             * First data pre processing:
276             *  - finds the minimum frame length for each frame type during 1st pass.
277             *     rc->min_size[]
278             *  - determines the maximum frame length observed (no frame type distinction).
279             *     rc->max_size
280             *  - count how many times each frame type has been used.
281             *     rc->count[]
282             *  - total bytes used per frame type
283             *     rc->total[]
284             *  - store keyframe location
285             *     rc->keyframe_locations[]
286             */
287            pre_process0(rc);
288    
289            /*
290             * When bitrate is not given it means it has been scaled by an external
291             * application
292             */
293            if (rc->param.bitrate) {
294                    /* Apply zone settings */
295                    zone_process(rc, create);
296                    /* Perform curve scaling */
297                    internal_scale(rc);
298            } else {
299                    /* External scaling -- zones are ignored */
300                    for (i=0;i<rc->num_frames;i++) {
301                            rc->stats[i].zone_mode = XVID_ZONE_WEIGHT;
302                            rc->stats[i].weight = 1.0;
303                    }
304                    rc->avg_weight = 1.0;
305                    rc->tot_quant = 0;
306            }
307    
308            pre_process1(rc);
309    
310            *handle = rc;
311            return(0);
312    }
313    
314    /*----------------------------------------------------------------------------
315     *--------------------------------------------------------------------------*/
316    
317    static int
318    rc_2pass2_destroy(rc_2pass2_t * rc, xvid_plg_destroy_t * destroy)
319    {
320        free(rc->keyframe_locations);
321        free(rc->stats);
322            free(rc);
323            return(0);
324    }
325    
326    /*----------------------------------------------------------------------------
327     *--------------------------------------------------------------------------*/
328    
329    static int
330    rc_2pass2_before(rc_2pass2_t * rc, xvid_plg_data_t * data)
331    {
332            stat_t * s = &rc->stats[data->frame_num];
333            int overflow;
334            int desired;
335            double dbytes;
336            double curve_temp;
337            double scaled_quant;
338            int capped_to_max_framesize = 0;
339    
340            /*
341             * This function is quite long but easy to understand. In order to simplify
342             * the code path (a bit), we treat 3 cases that can return immediatly.
343             */
344    
345            /* First case: Another plugin has already set a quantizer */
346        if (data->quant > 0)
347                    return(0);
348    
349            /* Second case: We are in a Quant zone */
350            if (s->zone_mode == XVID_ZONE_QUANT) {
351                    rc->fq_error += s->weight;
352                    data->quant = (int)rc->fq_error;
353                    rc->fq_error -= data->quant;
354    
355                    s->desired_length = s->length;
356    
357                    return(0);
358            }
359    
360            /* Third case: insufficent stats data */
361            if (data->frame_num >= rc->num_frames)
362                    return 0;
363    
364            /* XXX: why by 8 */
365            overflow = rc->overflow / 8;
366    
367            /*
368             * The rc->overflow field represents the overflow in current scene (between two
369             * IFrames) so we must not forget to reset it if we are entering a new scene
370             */
371            if (s->type == XVID_TYPE_IVOP)
372                    overflow = 0;
373    
374            desired = s->scaled_length;
375    
376            dbytes = desired;
377            if (s->type == XVID_TYPE_IVOP)
378                    dbytes += desired * rc->param.keyframe_boost / 100;
379            dbytes /= rc->movie_curve;
380    
381            /*
382             * Apply user's choosen Payback method. Payback helps bitrate to follow the
383             * scaled curve "paying back" past errors in curve previsions.
384             */
385            if (rc->param.payback_method == XVID_PAYBACK_BIAS) {
386                    desired = (int)(rc->curve_comp_error / rc->param.bitrate_payback_delay);
387            } else {
388                    desired = (int)(rc->curve_comp_error * dbytes /
389                                                    rc->avg_length[s->type-1] / rc->param.bitrate_payback_delay);
390    
391                    if (labs(desired) > fabs(rc->curve_comp_error))
392                            desired = (int)rc->curve_comp_error;
393            }
394    
395            rc->curve_comp_error -= desired;
396    
397            /* XXX: warning */
398            curve_temp = 0;
399    
400            if ((rc->param.curve_compression_high + rc->param.curve_compression_low) &&     s->type != XVID_TYPE_IVOP) {
401    
402                    curve_temp = rc->curve_comp_scale;
403                    if (dbytes > rc->avg_length[s->type-1]) {
404                            curve_temp *= ((double)dbytes + (rc->avg_length[s->type-1] - dbytes) * rc->param.curve_compression_high / 100.0);
405                    } else {
406                            curve_temp *= ((double)dbytes + (rc->avg_length[s->type-1] - dbytes) * rc->param.curve_compression_low / 100.0);
407                    }
408    
409                    desired += (int)curve_temp;
410                    rc->curve_comp_error += curve_temp - (int)curve_temp;
411            } else {
412                    desired += (int)dbytes;
413                    rc->curve_comp_error += dbytes - (int)dbytes;
414            }
415    
416    
417            /*
418             * We can't do bigger frames than first pass, this would be stupid as first
419             * pass is quant=2 and that reaching quant=1 is not worth it. We would lose
420             * many bytes and we would not not gain much quality.
421             */
422            if (desired > s->length) {
423                    rc->curve_comp_error += desired - s->length;
424                    desired = s->length;
425            } else {
426                    if (desired < rc->min_length[s->type-1]) {
427                            if (s->type == XVID_TYPE_IVOP){
428                                    rc->curve_comp_error -= rc->min_length[XVID_TYPE_IVOP-1] - desired;
429                            }
430                            desired = rc->min_length[s->type-1];
431                    }
432            }
433    
434            s->desired_length = desired;
435    
436            /*
437             * if this keyframe is too close to the next, reduce it's byte allotment
438             * XXX: why do we do this after setting the desired length ?
439             */
440    
441            if (s->type == XVID_TYPE_IVOP) {
442                    int KFdistance = rc->keyframe_locations[rc->KF_idx] - rc->keyframe_locations[rc->KF_idx - 1];
443    
444                    if (KFdistance < rc->param.kftreshold) {
445    
446                            KFdistance -= rc->param.min_key_interval;
447    
448                            if (KFdistance >= 0) {
449                                    int KF_min_size;
450    
451                                    KF_min_size = desired * (100 - rc->param.kfreduction) / 100;
452                                    if (KF_min_size < 1)
453                                            KF_min_size = 1;
454    
455                                    desired = KF_min_size + (desired - KF_min_size) * KFdistance /
456                                            (rc->param.kftreshold - rc->param.min_key_interval);
457    
458                                    if (desired < 1)
459                                            desired = 1;
460                            }
461                    }
462            }
463    
464            /*
465             * The "sens commun" would force us to use rc->avg_length[s->type-1] but
466             * even VFW code uses the pframe average length. Note that this length is
467             * used with desired which represents bframes _and_ pframes length.
468             *
469             * XXX: why are we using the avg pframe length for all frame types ?
470             */
471            overflow = (int)((double)overflow * desired / rc->avg_length[XVID_TYPE_PVOP-1]);
472    
473            /* Reign in overflow with huge frames */
474            if (labs(overflow) > labs(rc->overflow))
475                    overflow = rc->overflow;
476    
477            /* Make sure overflow doesn't run away */
478            if (overflow > desired * rc->param.max_overflow_improvement / 100) {
479                    desired += (overflow <= desired) ? desired * rc->param.max_overflow_improvement / 100 :
480                            overflow * rc->param.max_overflow_improvement / 100;
481            } else if (overflow < desired * rc->param.max_overflow_degradation / -100){
482                    desired += desired * rc->param.max_overflow_degradation / -100;
483            } else {
484                    desired += overflow;
485            }
486    
487            /* Make sure we are not higher than desired frame size */
488            if (desired > rc->max_length) {
489                    capped_to_max_framesize = 1;
490                    desired = rc->max_length;
491                    DPRINTF(XVID_DEBUG_RC,"[%i] Capped to maximum frame size\n",
492                                    data->frame_num);
493            }
494    
495            /* Make sure to not scale below the minimum framesize */
496            if (desired < rc->min_length[s->type-1]) {
497                    desired = rc->min_length[s->type-1];
498                    DPRINTF(XVID_DEBUG_RC,"[%i] Capped to minimum frame size\n",
499                                    data->frame_num);
500            }
501    
502            /*
503             * Don't laugh at this very 'simple' quant<->filesize relationship, it
504             * proves to be acurate enough for our algorithm
505             */
506            scaled_quant = (double)s->quant*(double)s->length/(double)desired;
507    
508            /*
509             * Quantizer has been scaled using floating point operations/results, we
510             * must cast it to integer
511             */
512            data->quant = (int)scaled_quant;
513    
514            /* Let's clip the computed quantizer, if needed */
515            if (data->quant < 1) {
516                    data->quant = 1;
517            } else if (data->quant > 31) {
518                    data->quant = 31;
519            } else if (s->type != XVID_TYPE_IVOP) {
520    
521                    /*
522                     * The frame quantizer has not been clipped, this appears to be a good
523                     * computed quantizer, do not loose quantizer decimal part that we
524                     * accumulate for later reuse when its sum represents a complete unit.
525                     */
526                    rc->quant_error[s->type-1][data->quant] += scaled_quant - (double)data->quant;
527    
528                    if (rc->quant_error[s->type-1][data->quant] >= 1.0) {
529                            rc->quant_error[s->type-1][data->quant] -= 1.0;
530                            data->quant++;
531                    } else if (rc->quant_error[s->type-1][data->quant] <= -1.0) {
532                            rc->quant_error[s->type-1][data->quant] += 1.0;
533                            data->quant--;
534                    }
535    
536            }
537    
538            /*
539             * Now we have a computed quant that is in the right quante range, with a
540             * possible +1 correction due to cumulated error. We can now safely clip
541             * the quantizer again with user's quant ranges. "Safely" means the Rate
542             * Control could learn more about this quantizer, this knowledge is useful
543             * for future frames even if it this quantizer won't be really used atm,
544             * that's why we don't perform this clipping earlier.
545             */
546            if (data->quant < data->min_quant[s->type-1]) {
547                    data->quant = data->min_quant[s->type-1];
548            } else if (data->quant > data->max_quant[s->type-1]) {
549                    data->quant = data->max_quant[s->type-1];
550            }
551    
552            /*
553             * To avoid big quality jumps from frame to frame, we apply a "security"
554             * rule that makes |last_quant - new_quant| <= 2. This rule only applies
555             * to predicted frames (P and B)
556             */
557            if (s->type != XVID_TYPE_IVOP && rc->last_quant[s->type-1] && capped_to_max_framesize == 0) {
558    
559                    if (data->quant > rc->last_quant[s->type-1] + 2) {
560                            data->quant = rc->last_quant[s->type-1] + 2;
561                            DPRINTF(XVID_DEBUG_RC,
562                                            "[%i] p/b-frame quantizer prevented from rising too steeply\n",
563                                            data->frame_num);
564                    }
565                    if (data->quant < rc->last_quant[s->type-1] - 2) {
566                            data->quant = rc->last_quant[s->type-1] - 2;
567                            DPRINTF(XVID_DEBUG_RC,
568                                            "[%i] p/b-frame quantizer prevented from falling too steeply\n",
569                                            data->frame_num);
570                    }
571            }
572    
573            /*
574             * We don't want to pollute the RC history results when our computed quant
575             * has been computed from a capped frame size
576             */
577            if (capped_to_max_framesize == 0)
578                    rc->last_quant[s->type-1] = data->quant;
579    
580            /* Force frame type */
581            data->type = s->type;
582    
583            return 0;
584    }
585    
586    /*----------------------------------------------------------------------------
587     *--------------------------------------------------------------------------*/
588    
589    static int
590    rc_2pass2_after(rc_2pass2_t * rc, xvid_plg_data_t * data)
591    {
592            const char frame_type[4] = { 'i', 'p', 'b', 's'};
593            stat_t * s = &rc->stats[data->frame_num];
594    
595            /* Insufficent stats data */
596        if (data->frame_num >= rc->num_frames)
597            return 0;
598    
599        rc->quant_count[data->quant]++;
600    
601        if (data->type == XVID_TYPE_IVOP) {
602            int kfdiff = (rc->keyframe_locations[rc->KF_idx] -      rc->keyframe_locations[rc->KF_idx - 1]);
603    
604            rc->overflow += rc->KFoverflow;
605            rc->KFoverflow = s->desired_length - data->length;
606    
607            if (kfdiff > 1) {  /* non-consecutive keyframes */
608                rc->KFoverflow_partial = rc->KFoverflow / (kfdiff - 1);
609            }else{ /* consecutive keyframes */
610                            rc->overflow += rc->KFoverflow;
611                            rc->KFoverflow = 0;
612                            rc->KFoverflow_partial = 0;
613            }
614            rc->KF_idx++;
615        } else {
616            /* distribute part of the keyframe overflow */
617            rc->overflow += s->desired_length - data->length + rc->KFoverflow_partial;
618            rc->KFoverflow -= rc->KFoverflow_partial;
619        }
620    
621            DPRINTF(XVID_DEBUG_RC, "[%i] type:%c quant:%i stats1:%i scaled:%i actual:%i desired:%d overflow:%i\n",
622                            data->frame_num,
623                            frame_type[data->type-1],
624                            data->quant,
625                            s->length,
626                            s->scaled_length,
627                            data->length,
628                            s->desired_length,
629                            rc->overflow);
630    
631        return(0);
632    }
633    
634    /*****************************************************************************
635     * Helper functions definition
636     ****************************************************************************/
637    
638    #define BUF_SZ   1024
639    #define MAX_COLS 5
640    
641    /* open stats file, and count num frames */
642    static int
643    det_stats_length(rc_2pass2_t * rc, char * filename)
644    {
645        FILE * f;
646        int n, ignore;
647        char type;
648    
649        rc->num_frames = 0;
650        rc->num_keyframes = 0;
651    
652        if ((f = fopen(filename, "rt")) == NULL)
653            return 0;
654    
655        while((n = fscanf(f, "%c %d %d %d %d %d %d\n",
656            &type, &ignore, &ignore, &ignore, &ignore, &ignore, &ignore)) != EOF) {
657            if (type == 'i') {
658                rc->num_frames++;
659                rc->num_keyframes++;
660            }else if (type == 'p' || type == 'b' || type == 's') {
661                rc->num_frames++;
662            }
663        }
664    
665        fclose(f);
666    
667        return 1;
668    }
669    
670    /* open stats file(s) and read into rc->stats array */
671    
672    static int
673    load_stats(rc_2pass2_t *rc, char * filename)
674    {
675        FILE * f;
676        int i, not_scaled;
677    
678    
679        if ((f = fopen(filename, "rt"))==NULL)
680            return 0;
681    
682        i = 0;
683            not_scaled = 0;
684        while(i < rc->num_frames) {
685            stat_t * s = &rc->stats[i];
686            int n;
687            char type;
688    
689                    s->scaled_length = 0;
690            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);
691            if (n == EOF) break;
692                    if (n < 7) {
693                            not_scaled = 1;
694                    }
695    
696            if (type == 'i') {
697                s->type = XVID_TYPE_IVOP;
698            }else if (type == 'p' || type == 's') {
699                s->type = XVID_TYPE_PVOP;
700            }else if (type == 'b') {
701                s->type = XVID_TYPE_BVOP;
702            }else{  /* unknown type */
703                DPRINTF(XVID_DEBUG_RC, "WARNING: unknown stats frame type, assuming pvop\n");
704                s->type = XVID_TYPE_PVOP;
705            }
706    
707            i++;
708        }
709    
710        rc->num_frames = i;
711    
712            fclose(f);
713    
714        return 1;
715    }
716    
717    #if 0
718    static void print_stats(rc_2pass2_t * rc)
719    {
720        int i;
721        DPRINTF(XVID_DEBUG_RC, "type quant length scaled_length\n");
722            for (i = 0; i < rc->num_frames; i++) {
723            stat_t * s = &rc->stats[i];
724            DPRINTF(XVID_DEBUG_RC, "%d %d %d %d\n", s->type, s->quant, s->length, s->scaled_length);
725        }
726    }
727    #endif
728    
729    /* pre-process the statistics data
730        - for each type, count, tot_length, min_length, max_length
731        - set keyframes_locations
732    */
733    
734    static void
735    pre_process0(rc_2pass2_t * rc)
736    {
737        int i,j;
738    
739            /*
740             * *rc fields initialization
741             * NB: INT_MAX and INT_MIN are used in order to be immediately replaced
742             *     with real values of the 1pass
743             */
744             for (i=0; i<3; i++) {
745                    rc->count[i]=0;
746                    rc->tot_length[i] = 0;
747                    rc->min_length[i] = INT_MAX;
748        }
749    
750            rc->max_length = INT_MIN;
751    
752            /*
753             * Loop through all frames and find/compute all the stuff this function
754             * is supposed to do
755             */
756            for (i=j=0; i<rc->num_frames; i++) {
757                    stat_t * s = &rc->stats[i];
758    
759                    rc->count[s->type-1]++;
760                    rc->tot_length[s->type-1] += s->length;
761    
762                    if (s->length < rc->min_length[s->type-1]) {
763                            rc->min_length[s->type-1] = s->length;
764                    }
765    
766                    if (s->length > rc->max_length) {
767                            rc->max_length = s->length;
768                    }
769    
770                    if (s->type == XVID_TYPE_IVOP) {
771                            rc->keyframe_locations[j] = i;
772                            j++;
773                    }
774            }
775    
776            /*
777             * Nota Bene:
778             * The "per sequence" overflow system considers a natural sequence to be
779             * formed by all frames between two iframes, so if we want to make sure
780             * the system does not go nuts during last sequence, we force the last
781             * frame to appear in the keyframe locations array.
782             */
783        rc->keyframe_locations[j] = i;
784    
785            DPRINTF(XVID_DEBUG_RC, "Min 1st pass IFrame length: %d\n", rc->min_length[0]);
786            DPRINTF(XVID_DEBUG_RC, "Min 1st pass PFrame length: %d\n", rc->min_length[1]);
787            DPRINTF(XVID_DEBUG_RC, "Min 1st pass BFrame length: %d\n", rc->min_length[2]);
788    }
789    
790    /* calculate zone weight "center" */
791    
792    static void
793    zone_process(rc_2pass2_t *rc, const xvid_plg_create_t * create)
794    {
795        int i,j;
796        int n = 0;
797    
798        rc->avg_weight = 0.0;
799        rc->tot_quant = 0;
800    
801    
802        if (create->num_zones == 0) {
803            for (j = 0; j < rc->num_frames; j++) {
804                rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;
805                rc->stats[j].weight = 1.0;
806            }
807            rc->avg_weight += rc->num_frames * 1.0;
808            n += rc->num_frames;
809        }
810    
811    
812        for(i=0; i < create->num_zones; i++) {
813    
814            int next = (i+1<create->num_zones) ? create->zones[i+1].frame : rc->num_frames;
815    
816            if (i==0 && create->zones[i].frame > 0) {
817                for (j = 0; j < create->zones[i].frame && j < rc->num_frames; j++) {
818                    rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;
819                    rc->stats[j].weight = 1.0;
820                }
821                rc->avg_weight += create->zones[i].frame * 1.0;
822                n += create->zones[i].frame;
823            }
824    
825            if (create->zones[i].mode == XVID_ZONE_WEIGHT) {
826                for (j = create->zones[i].frame; j < next && j < rc->num_frames; j++ ) {
827                    rc->stats[j].zone_mode = XVID_ZONE_WEIGHT;
828                    rc->stats[j].weight = (double)create->zones[i].increment / (double)create->zones[i].base;
829                }
830                next -= create->zones[i].frame;
831                rc->avg_weight += (double)(next * create->zones[i].increment) / (double)create->zones[i].base;
832                n += next;
833            }else{  /* XVID_ZONE_QUANT */
834                for (j = create->zones[i].frame; j < next && j < rc->num_frames; j++ ) {
835                    rc->stats[j].zone_mode = XVID_ZONE_QUANT;
836                    rc->stats[j].weight = (double)create->zones[i].increment / (double)create->zones[i].base;
837                    rc->tot_quant += rc->stats[j].length;
838                }
839            }
840        }
841        rc->avg_weight = n>0 ? rc->avg_weight/n : 1.0;
842    
843        DPRINTF(XVID_DEBUG_RC, "center_weight: %f (for %i frames);   fixed_bytes: %i\n", rc->avg_weight, n, rc->tot_quant);
844    }
845    
846    
847    /* scale the curve */
848    
849    static void
850    internal_scale(rc_2pass2_t *rc)
851    {
852            int64_t target  = rc->target - rc->tot_quant;
853            int64_t pass1_length = rc->tot_length[0] + rc->tot_length[1] + rc->tot_length[2] - rc->tot_quant;
854            double scaler;
855            int i, num_MBs;
856    
857            /* Let's compute a linear scaler in order to perform curve scaling */
858            scaler = (double)target / (double)pass1_length;
859    
860            if (target <= 0 || pass1_length <= 0 || target >= pass1_length) {
861                    DPRINTF(XVID_DEBUG_RC, "WARNING: Undersize detected\n");
862            scaler = 1.0;
863            }
864    
865        DPRINTF(XVID_DEBUG_RC,
866                            "Before correction: target=%i, tot_length=%i, scaler=%f\n",
867                            (int)target, (int)pass1_length, scaler);
868    
869            /*
870             * Compute min frame lengths (for each frame type) according to the number
871             * of MBs. We sum all blocks count from frame 0 (should be an IFrame, so
872             * blocks[0] should be enough) to know how many MBs there are.
873             *
874             * We compare these hardcoded values with observed values in first pass
875             * (determined in pre_process0).Then we keep the real minimum.
876             */
877            num_MBs = rc->stats[0].blks[0] + rc->stats[0].blks[1] + rc->stats[0].blks[2];
878    
879            if(rc->min_length[0] > ((num_MBs*22) + 240) / 8)
880                    rc->min_length[0] = ((num_MBs*22) + 240) / 8;
881    
882            if(rc->min_length[1] > ((num_MBs) + 88)  / 8)
883                    rc->min_length[1] = ((num_MBs) + 88)  / 8;
884    
885            if(rc->min_length[2] > 8)
886                    rc->min_length[2] = 8;
887    
888            /*
889             * Perform an initial scale pass.
890             * If a frame size is scaled underneath our hardcoded minimums, then we
891             * force the frame size to the minimum, and deduct the original & scaled
892             * frame length from the original and target total lengths
893             */
894            for (i=0; i<rc->num_frames; i++) {
895                    stat_t * s = &rc->stats[i];
896                    int len;
897    
898            if (s->zone_mode == XVID_ZONE_QUANT) {
899                s->scaled_length = s->length;
900                            continue;
901                    }
902    
903                    /* Compute the scaled length */
904                    len = (int)((double)s->length * scaler * s->weight / rc->avg_weight);
905    
906                    /* Compare with the computed minimum */
907                    if (len < rc->min_length[s->type-1]) {
908                            /* force frame size to our computed minimum */
909                            s->scaled_length = rc->min_length[s->type-1];
910                            target -= s->scaled_length;
911                            pass1_length -= s->length;
912                    } else {
913                            /* Do nothing for now, we'll scale this later */
914                            s->scaled_length = 0;
915                    }
916            }
917    
918            /* Correct the scaler for all non forced frames */
919            scaler = (double)target / (double)pass1_length;
920    
921            /* Detect undersizing */
922        if (target <= 0 || pass1_length <= 0 || target >= pass1_length) {
923                    DPRINTF(XVID_DEBUG_RC, "WARNING: Undersize detected\n");
924                    scaler = 1.0;
925            }
926    
927            DPRINTF(XVID_DEBUG_RC,
928                            "After correction: target=%i, tot_length=%i, scaler=%f\n",
929                            (int)target, (int)pass1_length, scaler);
930    
931            /* Do another pass with the new scaler */
932            for (i=0; i<rc->num_frames; i++) {
933                    stat_t * s = &rc->stats[i];
934    
935                    /* Ignore frame with forced frame sizes */
936                    if (s->scaled_length == 0)
937                            s->scaled_length = (int)((double)s->length * scaler * s->weight / rc->avg_weight);
938            }
939    }
940    
941    static void
942    pre_process1(rc_2pass2_t * rc)
943    {
944        int i;
945        double total1, total2;
946        uint64_t ivop_boost_total;
947    
948        ivop_boost_total = 0;
949        rc->curve_comp_error = 0;
950    
951        for (i=0; i<3; i++) {
952            rc->tot_scaled_length[i] = 0;
953        }
954    
955        for (i=0; i<rc->num_frames; i++) {
956            stat_t * s = &rc->stats[i];
957    
958            rc->tot_scaled_length[s->type-1] += s->scaled_length;
959    
960            if (s->type == XVID_TYPE_IVOP) {
961                ivop_boost_total += s->scaled_length * rc->param.keyframe_boost / 100;
962            }
963        }
964    
965        rc->movie_curve = ((double)(rc->tot_scaled_length[XVID_TYPE_PVOP-1] + rc->tot_scaled_length[XVID_TYPE_BVOP-1] + ivop_boost_total) /
966                                            (rc->tot_scaled_length[XVID_TYPE_PVOP-1] + rc->tot_scaled_length[XVID_TYPE_BVOP-1]));
967    
968        for(i=0; i<3; i++) {
969            if (rc->count[i] == 0 || rc->movie_curve == 0) {
970                rc->avg_length[i] = 1;
971            }else{
972                rc->avg_length[i] = rc->tot_scaled_length[i] / rc->count[i] / rc->movie_curve;
973            }
974        }
975    
976        /* --- */
977    
978        total1=total2=0;
979    
980        for (i=0; i<rc->num_frames; i++) {
981            stat_t * s = &rc->stats[i];
982    
983            if (s->type != XVID_TYPE_IVOP) {
984                double dbytes,dbytes2;
985    
986                dbytes = s->scaled_length / rc->movie_curve;
987                dbytes2 = 0; /* XXX: warning */
988                total1 += dbytes;
989    
990                            if (dbytes > rc->avg_length[s->type-1]) {
991                                    dbytes2=((double)dbytes + (rc->avg_length[s->type-1] - dbytes) * rc->param.curve_compression_high / 100.0);
992                            } else {
993                                    dbytes2 = ((double)dbytes + (rc->avg_length[s->type-1] - dbytes) * rc->param.curve_compression_low / 100.0);
994                            }
995    
996                            if (dbytes2 < rc->min_length[s->type-1])
997                                        dbytes2 = rc->min_length[s->type-1];
998    
999                total2 += dbytes2;
1000            }
1001        }
1002    
1003        rc->curve_comp_scale = total1 / total2;
1004    
1005            DPRINTF(XVID_DEBUG_RC, "middle frame size for asymmetric curve compression: pframe%d bframe:%d\n",
1006                (int)(rc->avg_length[XVID_TYPE_PVOP-1] * rc->curve_comp_scale),
1007                            (int)(rc->avg_length[XVID_TYPE_BVOP-1] * rc->curve_comp_scale));
1008    
1009        rc->overflow = 0;
1010        rc->KFoverflow = 0;
1011        rc->KFoverflow_partial = 0;
1012        rc->KF_idx = 1;
1013    }
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