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1 : suxen_drol 1.1.2.1 /******************************************************************************
2 :     *
3 :     * XviD Bit Rate Controller Library
4 : edgomez 1.1.2.11 * - VBR 2 pass bitrate controller implementation -
5 : suxen_drol 1.1.2.1 *
6 : edgomez 1.1.2.7 * 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 : suxen_drol 1.1.2.1 *
11 : edgomez 1.1.2.7 * This curve treatment algorithm is the one originally implemented by Foxer
12 :     * and tuned by Dirk Knop for the XviD vfw frontend.
13 : suxen_drol 1.1.2.1 *
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 : edgomez 1.1.2.19 * $Id: plugin_2pass2.c,v 1.1.2.18 2003/05/29 14:18:18 edgomez Exp $
29 : suxen_drol 1.1.2.1 *
30 :     *****************************************************************************/
31 :    
32 :     #include <stdio.h>
33 :     #include <math.h>
34 : edgomez 1.1.2.9 #include <limits.h>
35 : suxen_drol 1.1.2.1
36 : edgomez 1.1.2.11 #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 : suxen_drol 1.1.2.1
60 : edgomez 1.1.2.11 /* Statistics */
61 : suxen_drol 1.1.2.1 typedef struct {
62 :     int type; /* first pass type */
63 :     int quant; /* first pass quant */
64 : suxen_drol 1.1.2.2 int blks[3]; /* k,m,y blks */
65 : suxen_drol 1.1.2.1 int length; /* first pass length */
66 : suxen_drol 1.1.2.4 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 : suxen_drol 1.1.2.1 } stat_t;
72 :    
73 : edgomez 1.1.2.11 /* Context struct */
74 : suxen_drol 1.1.2.1 typedef struct
75 :     {
76 :     xvid_plugin_2pass2_t param;
77 :    
78 :     /* constant statistical data */
79 : suxen_drol 1.1.2.2 int num_frames;
80 : edgomez 1.1.2.15 int num_keyframes;
81 :     uint64_t target; /* target filesize */
82 : suxen_drol 1.1.2.4
83 : edgomez 1.1.2.15 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 : suxen_drol 1.1.2.4
90 : edgomez 1.1.2.15 /* zone statistical data */
91 :     double avg_weight; /* average weight */
92 :     int64_t tot_quant; /* total length used by XVID_ZONE_QUANT zones */
93 : suxen_drol 1.1.2.1
94 :    
95 : edgomez 1.1.2.15 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 : suxen_drol 1.1.2.4
107 : edgomez 1.1.2.15 double curve_comp_error;
108 :     int overflow;
109 :     int KFoverflow;
110 :     int KFoverflow_partial;
111 :     int KF_idx;
112 :    
113 :     double fq_error;
114 : suxen_drol 1.1.2.1 } rc_2pass2_t;
115 :    
116 :    
117 : edgomez 1.1.2.11 /*****************************************************************************
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 : suxen_drol 1.1.2.1
130 : edgomez 1.1.2.11 int
131 :     xvid_plugin_2pass2(void * handle, int opt, void * param1, void * param2)
132 : suxen_drol 1.1.2.1 {
133 : edgomez 1.1.2.11 switch(opt) {
134 :     case XVID_PLG_INFO :
135 :     return 0;
136 : suxen_drol 1.1.2.1
137 : edgomez 1.1.2.11 case XVID_PLG_CREATE :
138 :     return rc_2pass2_create((xvid_plg_create_t*)param1, param2);
139 : suxen_drol 1.1.2.1
140 : edgomez 1.1.2.11 case XVID_PLG_DESTROY :
141 :     return rc_2pass2_destroy((rc_2pass2_t*)handle, (xvid_plg_destroy_t*)param1);
142 : suxen_drol 1.1.2.1
143 : edgomez 1.1.2.11 case XVID_PLG_BEFORE :
144 :     return rc_2pass2_before((rc_2pass2_t*)handle, (xvid_plg_data_t*)param1);
145 : suxen_drol 1.1.2.1
146 : edgomez 1.1.2.11 case XVID_PLG_AFTER :
147 :     return rc_2pass2_after((rc_2pass2_t*)handle, (xvid_plg_data_t*)param1);
148 :     }
149 : suxen_drol 1.1.2.1
150 : edgomez 1.1.2.11 return XVID_ERR_FAIL;
151 : suxen_drol 1.1.2.1 }
152 :    
153 : edgomez 1.1.2.11 /*****************************************************************************
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 : suxen_drol 1.1.2.1
165 : edgomez 1.1.2.11 /*----------------------------------------------------------------------------
166 :     *--------------------------------------------------------------------------*/
167 : suxen_drol 1.1.2.1
168 : edgomez 1.1.2.11 static int
169 :     rc_2pass2_create(xvid_plg_create_t * create, rc_2pass2_t **handle)
170 : suxen_drol 1.1.2.2 {
171 : edgomez 1.1.2.11 xvid_plugin_2pass2_t * param = (xvid_plugin_2pass2_t *)create->param;
172 :     rc_2pass2_t * rc;
173 :     int i;
174 : suxen_drol 1.1.2.2
175 : edgomez 1.1.2.11 rc = malloc(sizeof(rc_2pass2_t));
176 :     if (rc == NULL)
177 :     return XVID_ERR_MEMORY;
178 : suxen_drol 1.1.2.2
179 : edgomez 1.1.2.11 rc->param = *param;
180 : suxen_drol 1.1.2.2
181 : edgomez 1.1.2.15 /*
182 :     * Initialize all defaults
183 :     */
184 : edgomez 1.1.2.11 #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 : suxen_drol 1.1.2.2
200 : edgomez 1.1.2.15 /* 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 : edgomez 1.1.2.11 /* Count frames in the stats file */
215 : edgomez 1.1.2.15 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 : edgomez 1.1.2.7
221 : edgomez 1.1.2.11 /* 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 : edgomez 1.1.2.7
227 : edgomez 1.1.2.11 /*
228 :     * Allocate keyframes location's memory
229 :     * PS: see comment in pre_process0 for the +1 location requirement
230 :     */
231 : edgomez 1.1.2.15 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 : suxen_drol 1.1.2.2
246 : edgomez 1.1.2.15 /* Compute the target filesize */
247 : edgomez 1.1.2.11 if (rc->num_frames < create->fbase/create->fincr) {
248 : edgomez 1.1.2.15 /* Source sequence is less than 1s long, we do as if it was 1s long */
249 :     rc->target = rc->param.bitrate / 8;
250 : edgomez 1.1.2.11 } else {
251 : edgomez 1.1.2.15 /* Target filesize = bitrate/8 * numframes / framerate */
252 : edgomez 1.1.2.11 rc->target =
253 : edgomez 1.1.2.15 ((uint64_t)rc->param.bitrate * (uint64_t)rc->num_frames * \
254 :     (uint64_t)create->fincr) / \
255 : edgomez 1.1.2.11 ((uint64_t)create->fbase * 8);
256 :     }
257 : suxen_drol 1.1.2.2
258 : edgomez 1.1.2.15 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 : edgomez 1.1.2.11 DPRINTF(XVID_DEBUG_RC, "Target bitrate: %ld\n", rc->param.bitrate);
263 :     DPRINTF(XVID_DEBUG_RC, "Target filesize: %lld\n", rc->target);
264 : suxen_drol 1.1.2.1
265 : edgomez 1.1.2.15 /* Compensate the average frame overhead caused by the container */
266 : edgomez 1.1.2.11 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 : suxen_drol 1.1.2.1
270 : edgomez 1.1.2.15 /*
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 : edgomez 1.1.2.11 pre_process0(rc);
284 : suxen_drol 1.1.2.1
285 : edgomez 1.1.2.15 /*
286 :     * When bitrate is not given it means it has been scaled by an external
287 :     * application
288 :     */
289 : edgomez 1.1.2.11 if (rc->param.bitrate) {
290 : edgomez 1.1.2.15 /* Apply zone settings */
291 :     zone_process(rc, create);
292 :     /* Perform curve scaling */
293 : edgomez 1.1.2.11 internal_scale(rc);
294 : edgomez 1.1.2.15 } 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 : suxen_drol 1.1.2.1
304 : edgomez 1.1.2.15 pre_process1(rc);
305 : edgomez 1.1.2.9
306 : edgomez 1.1.2.15 *handle = rc;
307 : edgomez 1.1.2.11 return(0);
308 :     }
309 : suxen_drol 1.1.2.1
310 : edgomez 1.1.2.11 /*----------------------------------------------------------------------------
311 :     *--------------------------------------------------------------------------*/
312 : suxen_drol 1.1.2.1
313 : edgomez 1.1.2.11 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 : suxen_drol 1.1.2.1
322 : edgomez 1.1.2.11 /*----------------------------------------------------------------------------
323 :     *--------------------------------------------------------------------------*/
324 :    
325 :     static int
326 :     rc_2pass2_before(rc_2pass2_t * rc, xvid_plg_data_t * data)
327 :     {
328 : edgomez 1.1.2.15 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 : edgomez 1.1.2.7
336 :     /*
337 : edgomez 1.1.2.11 * 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 : edgomez 1.1.2.7 */
340 : edgomez 1.1.2.9
341 : edgomez 1.1.2.11 /* First case: Another plugin has already set a quantizer */
342 :     if (data->quant > 0)
343 :     return(0);
344 : suxen_drol 1.1.2.2
345 : edgomez 1.1.2.11 /* 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 : suxen_drol 1.1.2.4
353 : edgomez 1.1.2.11 return(0);
354 :     }
355 : suxen_drol 1.1.2.4
356 : edgomez 1.1.2.11 /* Third case: insufficent stats data */
357 :     if (data->frame_num >= rc->num_frames)
358 :     return 0;
359 : suxen_drol 1.1.2.4
360 : edgomez 1.1.2.11 /* XXX: why by 8 */
361 :     overflow = rc->overflow / 8;
362 : suxen_drol 1.1.2.4
363 : edgomez 1.1.2.11 /*
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 : edgomez 1.1.2.13 if (s->type == XVID_TYPE_IVOP)
368 : edgomez 1.1.2.11 overflow = 0;
369 : suxen_drol 1.1.2.4
370 : edgomez 1.1.2.11 desired = s->scaled_length;
371 : suxen_drol 1.1.2.4
372 : edgomez 1.1.2.11 dbytes = desired;
373 : edgomez 1.1.2.13 if (s->type == XVID_TYPE_IVOP)
374 : edgomez 1.1.2.11 dbytes += desired * rc->param.keyframe_boost / 100;
375 :     dbytes /= rc->movie_curve;
376 : suxen_drol 1.1.2.4
377 : edgomez 1.1.2.11 /*
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 : edgomez 1.1.2.15 desired = (int)(rc->curve_comp_error / rc->param.bitrate_payback_delay);
383 : edgomez 1.1.2.11 } else {
384 :     desired = (int)(rc->curve_comp_error * dbytes /
385 : edgomez 1.1.2.18 rc->avg_length[s->type-1] / rc->param.bitrate_payback_delay);
386 : suxen_drol 1.1.2.4
387 : edgomez 1.1.2.18 if (labs(desired) > fabs(rc->curve_comp_error))
388 : edgomez 1.1.2.11 desired = (int)rc->curve_comp_error;
389 :     }
390 : suxen_drol 1.1.2.4
391 : edgomez 1.1.2.11 rc->curve_comp_error -= desired;
392 : suxen_drol 1.1.2.4
393 : edgomez 1.1.2.11 /* XXX: warning */
394 :     curve_temp = 0;
395 : suxen_drol 1.1.2.4
396 : edgomez 1.1.2.13 if ((rc->param.curve_compression_high + rc->param.curve_compression_low) && s->type != XVID_TYPE_IVOP) {
397 : suxen_drol 1.1.2.4
398 : edgomez 1.1.2.11 curve_temp = rc->curve_comp_scale;
399 : edgomez 1.1.2.18 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 : edgomez 1.1.2.11 } else {
402 : edgomez 1.1.2.18 curve_temp *= ((double)dbytes + (rc->avg_length[s->type-1] - dbytes) * rc->param.curve_compression_low / 100.0);
403 : edgomez 1.1.2.11 }
404 : suxen_drol 1.1.2.4
405 : edgomez 1.1.2.11 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 : suxen_drol 1.1.2.4 }
411 :    
412 :    
413 : edgomez 1.1.2.11 /*
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 : suxen_drol 1.1.2.2
430 : edgomez 1.1.2.11 s->desired_length = desired;
431 : suxen_drol 1.1.2.2
432 : edgomez 1.1.2.15 /*
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 : suxen_drol 1.1.2.2
437 : edgomez 1.1.2.11 if (s->type == XVID_TYPE_IVOP) {
438 :     int KFdistance = rc->keyframe_locations[rc->KF_idx] - rc->keyframe_locations[rc->KF_idx - 1];
439 : suxen_drol 1.1.2.2
440 : edgomez 1.1.2.11 if (KFdistance < rc->param.kftreshold) {
441 :    
442 :     KFdistance -= rc->param.min_key_interval;
443 : suxen_drol 1.1.2.2
444 : edgomez 1.1.2.11 if (KFdistance >= 0) {
445 :     int KF_min_size;
446 : suxen_drol 1.1.2.2
447 : edgomez 1.1.2.11 KF_min_size = desired * (100 - rc->param.kfreduction) / 100;
448 :     if (KF_min_size < 1)
449 :     KF_min_size = 1;
450 : suxen_drol 1.1.2.1
451 : edgomez 1.1.2.11 desired = KF_min_size + (desired - KF_min_size) * KFdistance /
452 :     (rc->param.kftreshold - rc->param.min_key_interval);
453 : suxen_drol 1.1.2.1
454 : edgomez 1.1.2.11 if (desired < 1)
455 :     desired = 1;
456 :     }
457 :     }
458 :     }
459 : suxen_drol 1.1.2.1
460 : edgomez 1.1.2.18 /*
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 : edgomez 1.1.2.11 overflow = (int)((double)overflow * desired / rc->avg_length[XVID_TYPE_PVOP-1]);
468 : suxen_drol 1.1.2.1
469 : edgomez 1.1.2.11 /* Reign in overflow with huge frames */
470 : edgomez 1.1.2.13 if (labs(overflow) > labs(rc->overflow))
471 : edgomez 1.1.2.11 overflow = rc->overflow;
472 : suxen_drol 1.1.2.1
473 : edgomez 1.1.2.11 /* 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 : suxen_drol 1.1.2.1
483 : edgomez 1.1.2.11 /* 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 : suxen_drol 1.1.2.1
491 : edgomez 1.1.2.11 /* 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 : suxen_drol 1.1.2.1
498 : edgomez 1.1.2.11 /*
499 :     * Don't laugh at this very 'simple' quant<->filesize relationship, it
500 :     * proves to be acurate enough for our algorithm
501 :     */
502 : edgomez 1.1.2.15 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 : suxen_drol 1.1.2.1
510 : edgomez 1.1.2.11 /* 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 : suxen_drol 1.1.2.1
517 : edgomez 1.1.2.11 /*
518 : edgomez 1.1.2.15 * 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 : edgomez 1.1.2.11 */
522 : edgomez 1.1.2.15 rc->quant_error[s->type-1][data->quant] += scaled_quant - (double)data->quant;
523 : suxen_drol 1.1.2.1
524 : edgomez 1.1.2.15 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 : edgomez 1.1.2.11 }
531 : edgomez 1.1.2.15
532 : edgomez 1.1.2.11 }
533 : suxen_drol 1.1.2.1
534 : edgomez 1.1.2.11 /*
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 : suxen_drol 1.1.2.1
548 : edgomez 1.1.2.11 /*
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 : suxen_drol 1.1.2.1
555 : edgomez 1.1.2.11 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 : suxen_drol 1.1.2.1
569 : edgomez 1.1.2.11 /*
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 : edgomez 1.1.2.13 if (capped_to_max_framesize == 0)
574 : edgomez 1.1.2.11 rc->last_quant[s->type-1] = data->quant;
575 : edgomez 1.1.2.17
576 :     /* Force frame type */
577 :     data->type = s->type;
578 : suxen_drol 1.1.2.1
579 : edgomez 1.1.2.11 return 0;
580 :     }
581 : suxen_drol 1.1.2.1
582 : edgomez 1.1.2.11 /*----------------------------------------------------------------------------
583 :     *--------------------------------------------------------------------------*/
584 : suxen_drol 1.1.2.1
585 : edgomez 1.1.2.11 static int
586 :     rc_2pass2_after(rc_2pass2_t * rc, xvid_plg_data_t * data)
587 :     {
588 : edgomez 1.1.2.12 const char frame_type[4] = { 'i', 'p', 'b', 's'};
589 :     stat_t * s = &rc->stats[data->frame_num];
590 : suxen_drol 1.1.2.1
591 : edgomez 1.1.2.11 /* Insufficent stats data */
592 :     if (data->frame_num >= rc->num_frames)
593 :     return 0;
594 : suxen_drol 1.1.2.1
595 : edgomez 1.1.2.11 rc->quant_count[data->quant]++;
596 : suxen_drol 1.1.2.1
597 : edgomez 1.1.2.11 if (data->type == XVID_TYPE_IVOP) {
598 :     int kfdiff = (rc->keyframe_locations[rc->KF_idx] - rc->keyframe_locations[rc->KF_idx - 1]);
599 : suxen_drol 1.1.2.1
600 : edgomez 1.1.2.11 rc->overflow += rc->KFoverflow;
601 :     rc->KFoverflow = s->desired_length - data->length;
602 :    
603 : edgomez 1.1.2.19 if (kfdiff > 1) { /* non-consecutive keyframes */
604 : edgomez 1.1.2.11 rc->KFoverflow_partial = rc->KFoverflow / (kfdiff - 1);
605 : edgomez 1.1.2.19 }else{ /* consecutive keyframes */
606 : edgomez 1.1.2.11 rc->overflow += rc->KFoverflow;
607 :     rc->KFoverflow = 0;
608 :     rc->KFoverflow_partial = 0;
609 :     }
610 :     rc->KF_idx++;
611 :     } else {
612 : edgomez 1.1.2.19 /* distribute part of the keyframe overflow */
613 : edgomez 1.1.2.11 rc->overflow += s->desired_length - data->length + rc->KFoverflow_partial;
614 :     rc->KFoverflow -= rc->KFoverflow_partial;
615 :     }
616 : suxen_drol 1.1.2.1
617 : edgomez 1.1.2.15 DPRINTF(XVID_DEBUG_RC, "[%i] type:%c quant:%i stats1:%i scaled:%i actual:%i desired:%d overflow:%i\n",
618 : edgomez 1.1.2.11 data->frame_num,
619 : edgomez 1.1.2.12 frame_type[data->type-1],
620 : edgomez 1.1.2.11 data->quant,
621 :     s->length,
622 :     s->scaled_length,
623 :     data->length,
624 : edgomez 1.1.2.15 s->desired_length,
625 : edgomez 1.1.2.11 rc->overflow);
626 : suxen_drol 1.1.2.1
627 : edgomez 1.1.2.11 return(0);
628 : suxen_drol 1.1.2.1 }
629 :    
630 : edgomez 1.1.2.11 /*****************************************************************************
631 :     * Helper functions definition
632 :     ****************************************************************************/
633 : suxen_drol 1.1.2.1
634 : edgomez 1.1.2.11 #define BUF_SZ 1024
635 :     #define MAX_COLS 5
636 : suxen_drol 1.1.2.1
637 : edgomez 1.1.2.11 /* open stats file, and count num frames */
638 :     static int
639 :     det_stats_length(rc_2pass2_t * rc, char * filename)
640 : suxen_drol 1.1.2.1 {
641 : edgomez 1.1.2.11 FILE * f;
642 :     int n, ignore;
643 :     char type;
644 : suxen_drol 1.1.2.1
645 : edgomez 1.1.2.11 rc->num_frames = 0;
646 :     rc->num_keyframes = 0;
647 : suxen_drol 1.1.2.1
648 : edgomez 1.1.2.11 if ((f = fopen(filename, "rt")) == NULL)
649 :     return 0;
650 : suxen_drol 1.1.2.1
651 : edgomez 1.1.2.11 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 : suxen_drol 1.1.2.1 }
660 :    
661 : edgomez 1.1.2.11 fclose(f);
662 : suxen_drol 1.1.2.1
663 : edgomez 1.1.2.11 return 1;
664 :     }
665 : suxen_drol 1.1.2.2
666 : edgomez 1.1.2.11 /* open stats file(s) and read into rc->stats array */
667 : suxen_drol 1.1.2.4
668 : edgomez 1.1.2.11 static int
669 :     load_stats(rc_2pass2_t *rc, char * filename)
670 :     {
671 :     FILE * f;
672 :     int i, not_scaled;
673 :    
674 : suxen_drol 1.1.2.5
675 : edgomez 1.1.2.11 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 : suxen_drol 1.1.2.2
685 : edgomez 1.1.2.11 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 : edgomez 1.1.2.6
692 : edgomez 1.1.2.11 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 : edgomez 1.1.2.18 DPRINTF(XVID_DEBUG_RC, "WARNING: unknown stats frame type, assuming pvop\n");
700 : edgomez 1.1.2.11 s->type = XVID_TYPE_PVOP;
701 : suxen_drol 1.1.2.4 }
702 :    
703 : edgomez 1.1.2.11 i++;
704 : suxen_drol 1.1.2.4 }
705 :    
706 : edgomez 1.1.2.11 rc->num_frames = i;
707 : suxen_drol 1.1.2.1
708 : edgomez 1.1.2.11 fclose(f);
709 : suxen_drol 1.1.2.1
710 : edgomez 1.1.2.11 return 1;
711 : suxen_drol 1.1.2.1 }
712 :    
713 : edgomez 1.1.2.11 #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 : suxen_drol 1.1.2.1
725 : edgomez 1.1.2.11 /* pre-process the statistics data
726 :     - for each type, count, tot_length, min_length, max_length
727 :     - set keyframes_locations
728 :     */
729 : suxen_drol 1.1.2.1
730 : edgomez 1.1.2.11 static void
731 :     pre_process0(rc_2pass2_t * rc)
732 : suxen_drol 1.1.2.1 {
733 : edgomez 1.1.2.11 int i,j;
734 : edgomez 1.1.2.7
735 : edgomez 1.1.2.15 /*
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 : edgomez 1.1.2.11 rc->min_length[i] = INT_MAX;
744 :     }
745 : edgomez 1.1.2.7
746 : edgomez 1.1.2.11 rc->max_length = INT_MIN;
747 : edgomez 1.1.2.7
748 : edgomez 1.1.2.15 /*
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 : suxen_drol 1.1.2.1
755 : edgomez 1.1.2.15 rc->count[s->type-1]++;
756 :     rc->tot_length[s->type-1] += s->length;
757 : suxen_drol 1.1.2.1
758 : edgomez 1.1.2.15 if (s->length < rc->min_length[s->type-1]) {
759 :     rc->min_length[s->type-1] = s->length;
760 :     }
761 : suxen_drol 1.1.2.1
762 : edgomez 1.1.2.15 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 : edgomez 1.1.2.7
772 :     /*
773 : edgomez 1.1.2.11 * 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 : edgomez 1.1.2.7 */
779 : edgomez 1.1.2.11 rc->keyframe_locations[j] = i;
780 : edgomez 1.1.2.7
781 : edgomez 1.1.2.11 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 : edgomez 1.1.2.7
788 : edgomez 1.1.2.11 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 : suxen_drol 1.1.2.5
794 : edgomez 1.1.2.11 rc->avg_weight = 0.0;
795 :     rc->tot_quant = 0;
796 : suxen_drol 1.1.2.1
797 :    
798 : edgomez 1.1.2.11 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 : edgomez 1.1.2.19 }else{ /* XVID_ZONE_QUANT */
830 : edgomez 1.1.2.11 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 : suxen_drol 1.1.2.1
839 : edgomez 1.1.2.11 DPRINTF(XVID_DEBUG_RC, "center_weight: %f (for %i frames); fixed_bytes: %i\n", rc->avg_weight, n, rc->tot_quant);
840 :     }
841 : suxen_drol 1.1.2.1
842 :    
843 : edgomez 1.1.2.11 /* scale the curve */
844 : suxen_drol 1.1.2.1
845 : edgomez 1.1.2.11 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 : edgomez 1.1.2.14 int i, num_MBs;
852 : suxen_drol 1.1.2.1
853 : edgomez 1.1.2.11 /* Let's compute a linear scaler in order to perform curve scaling */
854 :     scaler = (double)target / (double)pass1_length;
855 : suxen_drol 1.1.2.1
856 : edgomez 1.1.2.11 if (target <= 0 || pass1_length <= 0 || target >= pass1_length) {
857 :     DPRINTF(XVID_DEBUG_RC, "WARNING: Undersize detected\n");
858 :     scaler = 1.0;
859 :     }
860 : edgomez 1.1.2.7
861 : edgomez 1.1.2.11 DPRINTF(XVID_DEBUG_RC,
862 :     "Before correction: target=%i, tot_length=%i, scaler=%f\n",
863 :     (int)target, (int)pass1_length, scaler);
864 : edgomez 1.1.2.7
865 : edgomez 1.1.2.11 /*
866 : edgomez 1.1.2.14 * 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 : edgomez 1.1.2.16 *
870 :     * We compare these hardcoded values with observed values in first pass
871 :     * (determined in pre_process0).Then we keep the real minimum.
872 : edgomez 1.1.2.14 */
873 :     num_MBs = rc->stats[0].blks[0] + rc->stats[0].blks[1] + rc->stats[0].blks[2];
874 : edgomez 1.1.2.16
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 : edgomez 1.1.2.14
884 :     /*
885 : edgomez 1.1.2.11 * 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 : suxen_drol 1.1.2.1
894 : edgomez 1.1.2.11 if (s->zone_mode == XVID_ZONE_QUANT) {
895 :     s->scaled_length = s->length;
896 :     continue;
897 : edgomez 1.1.2.7 }
898 : suxen_drol 1.1.2.1
899 : edgomez 1.1.2.15 /* Compute the scaled length */
900 : edgomez 1.1.2.11 len = (int)((double)s->length * scaler * s->weight / rc->avg_weight);
901 : edgomez 1.1.2.7
902 : edgomez 1.1.2.11 /* Compare with the computed minimum */
903 : edgomez 1.1.2.16 if (len < rc->min_length[s->type-1]) {
904 : edgomez 1.1.2.11 /* force frame size to our computed minimum */
905 : edgomez 1.1.2.16 s->scaled_length = rc->min_length[s->type-1];
906 : edgomez 1.1.2.11 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 : edgomez 1.1.2.7 }
912 :     }
913 : suxen_drol 1.1.2.1
914 : edgomez 1.1.2.11 /* Correct the scaler for all non forced frames */
915 :     scaler = (double)target / (double)pass1_length;
916 : suxen_drol 1.1.2.5
917 : edgomez 1.1.2.11 /* 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 : edgomez 1.1.2.7 }
922 : suxen_drol 1.1.2.1
923 : edgomez 1.1.2.11 DPRINTF(XVID_DEBUG_RC,
924 :     "After correction: target=%i, tot_length=%i, scaler=%f\n",
925 :     (int)target, (int)pass1_length, scaler);
926 : suxen_drol 1.1.2.4
927 : edgomez 1.1.2.11 /* Do another pass with the new scaler */
928 :     for (i=0; i<rc->num_frames; i++) {
929 :     stat_t * s = &rc->stats[i];
930 : suxen_drol 1.1.2.4
931 : edgomez 1.1.2.11 /* 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 : suxen_drol 1.1.2.1
937 : edgomez 1.1.2.11 static void
938 :     pre_process1(rc_2pass2_t * rc)
939 :     {
940 :     int i;
941 :     double total1, total2;
942 :     uint64_t ivop_boost_total;
943 : suxen_drol 1.1.2.1
944 : edgomez 1.1.2.11 ivop_boost_total = 0;
945 :     rc->curve_comp_error = 0;
946 : suxen_drol 1.1.2.1
947 : edgomez 1.1.2.11 for (i=0; i<3; i++) {
948 :     rc->tot_scaled_length[i] = 0;
949 :     }
950 : suxen_drol 1.1.2.1
951 : edgomez 1.1.2.11 for (i=0; i<rc->num_frames; i++) {
952 :     stat_t * s = &rc->stats[i];
953 : suxen_drol 1.1.2.1
954 : edgomez 1.1.2.11 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 : suxen_drol 1.1.2.1
961 : edgomez 1.1.2.11 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 : edgomez 1.1.2.7
964 : edgomez 1.1.2.11 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 : edgomez 1.1.2.7
972 : edgomez 1.1.2.11 /* --- */
973 : edgomez 1.1.2.7
974 : edgomez 1.1.2.11 total1=total2=0;
975 : edgomez 1.1.2.7
976 : edgomez 1.1.2.11 for (i=0; i<rc->num_frames; i++) {
977 :     stat_t * s = &rc->stats[i];
978 : edgomez 1.1.2.7
979 : edgomez 1.1.2.11 if (s->type != XVID_TYPE_IVOP) {
980 :     double dbytes,dbytes2;
981 : suxen_drol 1.1.2.1
982 : edgomez 1.1.2.11 dbytes = s->scaled_length / rc->movie_curve;
983 :     dbytes2 = 0; /* XXX: warning */
984 :     total1 += dbytes;
985 : suxen_drol 1.1.2.1
986 : edgomez 1.1.2.18 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 : edgomez 1.1.2.13 } else {
989 : edgomez 1.1.2.18 dbytes2 = ((double)dbytes + (rc->avg_length[s->type-1] - dbytes) * rc->param.curve_compression_low / 100.0);
990 : edgomez 1.1.2.13 }
991 : suxen_drol 1.1.2.1
992 : edgomez 1.1.2.18 if (dbytes2 < rc->min_length[s->type-1])
993 :     dbytes2 = rc->min_length[s->type-1];
994 :    
995 : edgomez 1.1.2.11 total2 += dbytes2;
996 : suxen_drol 1.1.2.1 }
997 :     }
998 :    
999 : edgomez 1.1.2.11 rc->curve_comp_scale = total1 / total2;
1000 : suxen_drol 1.1.2.1
1001 : edgomez 1.1.2.18 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 : suxen_drol 1.1.2.1
1005 : edgomez 1.1.2.11 rc->overflow = 0;
1006 :     rc->KFoverflow = 0;
1007 :     rc->KFoverflow_partial = 0;
1008 :     rc->KF_idx = 1;
1009 : suxen_drol 1.1.2.1 }
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