summaryrefslogtreecommitdiffstats
path: root/libhb/encx264.c
blob: 4316ea4276f525ccdd8f93ff87f8ca457c8c3fa2 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
/* $Id: encx264.c,v 1.21 2005/11/04 13:09:41 titer Exp $

   This file is part of the HandBrake source code.
   Homepage: <http://handbrake.fr/>.
   It may be used under the terms of the GNU General Public License. */

#include <stdarg.h>

#include "hb.h"
#include "hb_dict.h"
#include "encx264.h"

int  encx264Init( hb_work_object_t *, hb_job_t * );
int  encx264Work( hb_work_object_t *, hb_buffer_t **, hb_buffer_t ** );
void encx264Close( hb_work_object_t * );

hb_work_object_t hb_encx264 =
{
    WORK_ENCX264,
    "H.264/AVC encoder (libx264)",
    encx264Init,
    encx264Work,
    encx264Close
};

#define DTS_BUFFER_SIZE 32

/*
 * The frame info struct remembers information about each frame across calls
 * to x264_encoder_encode. Since frames are uniquely identified by their
 * timestamp, we use some bits of the timestamp as an index. The LSB is
 * chosen so that two successive frames will have different values in the
 * bits over any plausible range of frame rates. (Starting with bit 8 allows
 * any frame rate slower than 352fps.) The MSB determines the size of the array.
 * It is chosen so that two frames can't use the same slot during the
 * encoder's max frame delay (set by the standard as 16 frames) and so
 * that, up to some minimum frame rate, frames are guaranteed to map to
 * different slots. (An MSB of 17 which is 2^(17-8+1) = 1024 slots guarantees
 * no collisions down to a rate of .7 fps).
 */
#define FRAME_INFO_MAX2 (8)     // 2^8 = 256; 90000/256 = 352 frames/sec
#define FRAME_INFO_MIN2 (17)    // 2^17 = 128K; 90000/131072 = 1.4 frames/sec
#define FRAME_INFO_SIZE (1 << (FRAME_INFO_MIN2 - FRAME_INFO_MAX2 + 1))
#define FRAME_INFO_MASK (FRAME_INFO_SIZE - 1)

struct hb_work_private_s
{
    hb_job_t       * job;
    x264_t         * x264;
    x264_picture_t   pic_in;
    uint8_t        * grey_data;

    uint32_t       frames_in;
    uint32_t       frames_out;
    uint32_t       frames_split; // number of frames we had to split
    int            chap_mark;   // saved chap mark when we're propagating it
    int64_t        last_stop;   // Debugging - stop time of previous input frame
    int64_t        next_chap;

    struct {
        int64_t duration;
    } frame_info[FRAME_INFO_SIZE];

    char             filename[1024];
};

/***********************************************************************
 * hb_work_encx264_init
 ***********************************************************************
 *
 **********************************************************************/
int encx264Init( hb_work_object_t * w, hb_job_t * job )
{
    x264_param_t       param;
    x264_nal_t       * nal;
    int                nal_count;

    hb_work_private_t * pv = calloc( 1, sizeof( hb_work_private_t ) );
    w->private_data = pv;

    pv->job = job;

    memset( pv->filename, 0, 1024 );
    hb_get_tempory_filename( job->h, pv->filename, "x264.log" );

    if( x264_param_default_preset( &param, job->x264_preset, job->x264_tune ) < 0 )
    {
        free( pv );
        pv = NULL;
        return 1;
    }
    
    /* Enable metrics */
    param.analyse.b_psnr = 1;
    param.analyse.b_ssim = 1;

    /* QuickTime has trouble with very low QPs (resulting in visual artifacts).
     * Known to affect QuickTime 7, QuickTime X and iTunes.
     * Testing shows that a qpmin of 3 works.
     */
    param.rc.i_qp_min = 3;
    
    param.i_threads    = ( hb_get_cpu_count() * 3 / 2 );
    param.i_width      = job->width;
    param.i_height     = job->height;
    if( job->pass == 2 && job->cfr != 1 )
    {
        hb_interjob_t * interjob = hb_interjob_get( job->h );
        param.i_fps_num = interjob->vrate;
        param.i_fps_den = interjob->vrate_base;
    }
    else
    {
        param.i_fps_num = job->vrate;
        param.i_fps_den = job->vrate_base;
    }
    if ( job->cfr == 1 )
    {
        param.i_timebase_num   = 0;
        param.i_timebase_den   = 0;
        param.b_vfr_input = 0;
    }
    else
    {
        param.i_timebase_num   = 1;
        param.i_timebase_den   = 90000;
    }

    /* Disable annexb. Inserts size into nal header instead of start code */
    param.b_annexb     = 0;

    /* Set min:max keyframe intervals to 1:10 of fps.
       adjust +0.5 for when fps has remainder to bump
       { 23.976, 29.976, 59.94 } to { 24, 30, 60 } */
    param.i_keyint_min = (int)( (double)job->vrate / (double)job->vrate_base + 0.5 );
    param.i_keyint_max = 10 * param.i_keyint_min;

    param.i_log_level  = X264_LOG_INFO;
    
    /* set up the VUI color model & gamma to match what the COLR atom
     * set in muxmp4.c says. See libhb/muxmp4.c for notes. */
    if( job->color_matrix_code == 4 )
    {
        // Custom
        param.vui.i_colorprim = job->color_prim;
        param.vui.i_transfer  = job->color_transfer;
        param.vui.i_colmatrix = job->color_matrix;
    }
    else if( job->color_matrix_code == 3 )
    {
        // ITU BT.709 HD content
        param.vui.i_colorprim = HB_COLR_PRI_BT709;
        param.vui.i_transfer  = HB_COLR_TRA_BT709;
        param.vui.i_colmatrix = HB_COLR_MAT_BT709;
    }
    else if( job->color_matrix_code == 2 )
    {
        // ITU BT.601 DVD or SD TV content (PAL)
        param.vui.i_colorprim = HB_COLR_PRI_EBUTECH;
        param.vui.i_transfer  = HB_COLR_TRA_BT709;
        param.vui.i_colmatrix = HB_COLR_MAT_SMPTE170M;
    }
    else if( job->color_matrix_code == 1 )
    {
        // ITU BT.601 DVD or SD TV content (NTSC)
        param.vui.i_colorprim = HB_COLR_PRI_SMPTEC;
        param.vui.i_transfer  = HB_COLR_TRA_BT709;
        param.vui.i_colmatrix = HB_COLR_MAT_SMPTE170M;
    }
    else
    {
        // detected during scan
        param.vui.i_colorprim = job->title->color_prim;
        param.vui.i_transfer  = job->title->color_transfer;
        param.vui.i_colmatrix = job->title->color_matrix;
    }

    /* place job->advanced_opts in an hb_dict_t for convenience */
    hb_dict_t * x264_opts = NULL;
    if( job->advanced_opts != NULL && *job->advanced_opts != '\0' )
    {
        x264_opts = hb_encopts_to_dict( job->advanced_opts, job->vcodec );
    }
    /* iterate through x264_opts and have libx264 parse the options for us */
    int ret;
    hb_dict_entry_t * entry = NULL;
    while( ( entry = hb_dict_next( x264_opts, entry ) ) )
    {
        /* Here's where the strings are passed to libx264 for parsing. */
        ret = x264_param_parse( &param, entry->key, entry->value );
        /* Let x264 sanity check the options for us */
        if( ret == X264_PARAM_BAD_NAME )
            hb_log( "x264 options: Unknown suboption %s", entry->key );
        if( ret == X264_PARAM_BAD_VALUE )
            hb_log( "x264 options: Bad argument %s=%s", entry->key, entry->value ? entry->value : "(null)" );
    }
    hb_dict_free( &x264_opts );

    /* Reload colorimetry settings in case custom values were set
     * in the advanced_opts string */
    job->color_matrix_code = 4;
    job->color_prim = param.vui.i_colorprim;
    job->color_transfer = param.vui.i_transfer;
    job->color_matrix = param.vui.i_colmatrix;

    /* For 25 fps sources, HandBrake's explicit keyints will match the x264 defaults:
       min-keyint 25 (same as auto), keyint 250 */
    if( param.i_keyint_min != 25 || param.i_keyint_max != 250 )
    {
        int min_auto;

        if ( param.i_fps_num / param.i_fps_den < param.i_keyint_max / 10 )
            min_auto = param.i_fps_num / param.i_fps_den;
        else
            min_auto = param.i_keyint_max / 10;

        char min[40], max[40];
        param.i_keyint_min == X264_KEYINT_MIN_AUTO ? 
            snprintf( min, 40, "auto (%d)", min_auto ) : 
            snprintf( min, 40, "%d", param.i_keyint_min );

        param.i_keyint_max == X264_KEYINT_MAX_INFINITE ? 
            snprintf( max, 40, "infinite" ) : 
            snprintf( max, 40, "%d", param.i_keyint_max );

        hb_log( "encx264: min-keyint: %s, keyint: %s", min, max );
    }

    if( job->anamorphic.mode )
    {
        param.vui.i_sar_width  = job->anamorphic.par_width;
        param.vui.i_sar_height = job->anamorphic.par_height;

        hb_log( "encx264: encoding with stored aspect %d/%d",
                param.vui.i_sar_width, param.vui.i_sar_height );
    }


    if( job->vquality >= 0 )
    {
        /* Constant RF */
        param.rc.i_rc_method = X264_RC_CRF;
        param.rc.f_rf_constant = job->vquality;
        hb_log( "encx264: Encoding at constant RF %f", param.rc.f_rf_constant );
    }
    else
    {
        /* Average bitrate */
        param.rc.i_rc_method = X264_RC_ABR;
        param.rc.i_bitrate = job->vbitrate;
        switch( job->pass )
        {
            case 1:
                param.rc.b_stat_write  = 1;
                param.rc.psz_stat_out = pv->filename;
                break;
            case 2:
                param.rc.b_stat_read = 1;
                param.rc.psz_stat_in = pv->filename;
                break;
        }
    }

    /* Apply profile and level settings last, if present. */
    if( job->x264_profile )
    {
        if( x264_param_apply_profile( &param, job->x264_profile ) < 0 )
        {
            free( pv );
            pv = NULL;
            return 1;
        }
    }
    if( job->h264_level )
    {
        hb_apply_h264_level( &param, job->h264_level, job->x264_profile );
    }

    /* Turbo first pass */
    if( job->pass == 1 && job->fastfirstpass == 1 )
    {
        x264_param_apply_fastfirstpass( &param );
    }

    /* B-frames are on by default.*/
    job->areBframes = 1;
    
    if( param.i_bframe && param.i_bframe_pyramid )
    {
        /* Note b-pyramid here, so the initial delay can be doubled */
        job->areBframes = 2;
    }
    else if( !param.i_bframe )
    {
        /*
         When B-frames are enabled, the max frame count increments
         by 1 (regardless of the number of B-frames). If you don't
         change the duration of the video track when you mux, libmp4
         barfs.  So, check if the x264opts aren't using B-frames, and
         when they aren't, set the boolean job->areBframes as false.
         */
        job->areBframes = 0;
    }
    
    hb_deep_log( 2, "encx264: opening libx264 (pass %d)", job->pass );
    pv->x264 = x264_encoder_open( &param );
    if ( pv->x264 == NULL )
    {
        hb_error("encx264: x264_encoder_open failed.");
        free( pv );
        pv = NULL;
        return 1;
    }

    x264_encoder_headers( pv->x264, &nal, &nal_count );

    /* Sequence Parameter Set */
    memcpy(w->config->h264.sps, nal[0].p_payload + 4, nal[0].i_payload - 4);
    w->config->h264.sps_length = nal[0].i_payload - 4;

    /* Picture Parameter Set */
    memcpy(w->config->h264.pps, nal[1].p_payload + 4, nal[1].i_payload - 4);
    w->config->h264.pps_length = nal[1].i_payload - 4;

    x264_picture_init( &pv->pic_in );

    pv->pic_in.img.i_csp = X264_CSP_I420;
    pv->pic_in.img.i_plane = 3;

    if( job->grayscale )
    {
        int uvsize = hb_image_stride( PIX_FMT_YUV420P, job->width, 1 ) *
                     hb_image_height( PIX_FMT_YUV420P, job->height, 1 );
        pv->grey_data = malloc( uvsize );
        memset( pv->grey_data, 0x80, uvsize );
        pv->pic_in.img.plane[1] = pv->pic_in.img.plane[2] = pv->grey_data;
    }

    return 0;
}

void encx264Close( hb_work_object_t * w )
{
    hb_work_private_t * pv = w->private_data;

    if ( pv->frames_split )
    {
        hb_log( "encx264: %u frames had to be split (%u in, %u out)",
                pv->frames_split, pv->frames_in, pv->frames_out );
    }
    free( pv->grey_data );
    x264_encoder_close( pv->x264 );
    free( pv );
    w->private_data = NULL;

    /* TODO */
}

/*
 * see comments in definition of 'frame_info' in pv struct for description
 * of what these routines are doing.
 */
static void save_frame_info( hb_work_private_t * pv, hb_buffer_t * in )
{
    int i = (in->s.start >> FRAME_INFO_MAX2) & FRAME_INFO_MASK;
    pv->frame_info[i].duration = in->s.stop - in->s.start;
}

static int64_t get_frame_duration( hb_work_private_t * pv, int64_t pts )
{
    int i = (pts >> FRAME_INFO_MAX2) & FRAME_INFO_MASK;
    return pv->frame_info[i].duration;
}

static hb_buffer_t *nal_encode( hb_work_object_t *w, x264_picture_t *pic_out,
                                int i_nal, x264_nal_t *nal )
{
    hb_buffer_t *buf = NULL;
    hb_work_private_t *pv = w->private_data;
    hb_job_t *job = pv->job;

    /* Should be way too large */
    buf = hb_video_buffer_init( job->width, job->height );
    buf->size = 0;
    buf->s.frametype = 0;

    // use the pts to get the original frame's duration.
    int64_t duration  = get_frame_duration( pv, pic_out->i_pts );
    buf->s.start = pic_out->i_pts;
    buf->s.stop  = pic_out->i_pts + duration;
    buf->s.renderOffset = pic_out->i_dts;
    if ( !w->config->h264.init_delay && pic_out->i_dts < 0 )
    {
        w->config->h264.init_delay = -pic_out->i_dts;
    }

    /* Encode all the NALs we were given into buf.
       NOTE: This code assumes one video frame per NAL (but there can
             be other stuff like SPS and/or PPS). If there are multiple
             frames we only get the duration of the first which will
             eventually screw up the muxer & decoder. */
    int i;
    for( i = 0; i < i_nal; i++ )
    {
        int size = nal[i].i_payload;
        memcpy(buf->data + buf->size, nal[i].p_payload, size);
        if( size < 1 )
        {
            continue;
        }

        /* H.264 in .mp4 or .mkv */
        switch( nal[i].i_type )
        {
            /* Sequence Parameter Set & Program Parameter Set go in the
             * mp4 header so skip them here
             */
            case NAL_SPS:
            case NAL_PPS:
                continue;

            case NAL_SLICE:
            case NAL_SLICE_IDR:
            case NAL_SEI:
            default:
                break;
        }

        /* Decide what type of frame we have. */
        switch( pic_out->i_type )
        {
            case X264_TYPE_IDR:
                // Handled in b_keyframe check below.
                break;

            case X264_TYPE_I:
                buf->s.frametype = HB_FRAME_I;
                break;

            case X264_TYPE_P:
                buf->s.frametype = HB_FRAME_P;
                break;

            case X264_TYPE_B:
                buf->s.frametype = HB_FRAME_B;
                break;

        /*  This is for b-pyramid, which has reference b-frames
            However, it doesn't seem to ever be used... */
            case X264_TYPE_BREF:
                buf->s.frametype = HB_FRAME_BREF;
                break;

            // If it isn't the above, what type of frame is it??
            default:
                buf->s.frametype = 0;
                break;
        }

        /* Since libx264 doesn't tell us when b-frames are
           themselves reference frames, figure it out on our own. */
        if( (buf->s.frametype == HB_FRAME_B) &&
            (nal[i].i_ref_idc != NAL_PRIORITY_DISPOSABLE) )
            buf->s.frametype = HB_FRAME_BREF;

        /* Expose disposable bit to muxer. */
        if( nal[i].i_ref_idc == NAL_PRIORITY_DISPOSABLE )
            buf->s.flags &= ~HB_FRAME_REF;
        else
            buf->s.flags |= HB_FRAME_REF;

        // PIR has no IDR frames, but x264 marks recovery points
        // as keyframes.  So fake an IDR at these points. This flag
        // is also set for real IDR frames.
        if( pic_out->b_keyframe )
        {
            buf->s.frametype = HB_FRAME_IDR;
            /* if we have a chapter marker pending and this
               frame's presentation time stamp is at or after
               the marker's time stamp, use this as the
               chapter start. */
            if( pv->next_chap != 0 && pv->next_chap <= pic_out->i_pts )
            {
                pv->next_chap = 0;
                buf->s.new_chap = pv->chap_mark;
            }
        }

        buf->size += size;
    }
    // make sure we found at least one video frame
    if ( buf->size <= 0 )
    {
        // no video - discard the buf
        hb_buffer_close( &buf );
    }
    return buf;
}

static hb_buffer_t *x264_encode( hb_work_object_t *w, hb_buffer_t *in )
{
    hb_work_private_t *pv = w->private_data;
    hb_job_t *job = pv->job;

    /* Point x264 at our current buffers Y(UV) data.  */
    pv->pic_in.img.i_stride[0] = in->plane[0].stride;
    pv->pic_in.img.i_stride[1] = in->plane[1].stride;
    pv->pic_in.img.i_stride[2] = in->plane[2].stride;
    pv->pic_in.img.plane[0] = in->plane[0].data;
    if( !job->grayscale )
    {
        pv->pic_in.img.plane[1] = in->plane[1].data;
        pv->pic_in.img.plane[2] = in->plane[2].data;
    }

    if( in->s.new_chap && job->chapter_markers )
    {
        /* chapters have to start with an IDR frame so request that this
           frame be coded as IDR. Since there may be up to 16 frames
           currently buffered in the encoder remember the timestamp so
           when this frame finally pops out of the encoder we'll mark
           its buffer as the start of a chapter. */
        pv->pic_in.i_type = X264_TYPE_IDR;
        if( pv->next_chap == 0 )
        {
            pv->next_chap = in->s.start;
            pv->chap_mark = in->s.new_chap;
        }
        /* don't let 'work_loop' put a chapter mark on the wrong buffer */
        in->s.new_chap = 0;
    }
    else
    {
        pv->pic_in.i_type = X264_TYPE_AUTO;
    }

    /* XXX this is temporary debugging code to check that the upstream
     * modules (render & sync) have generated a continuous, self-consistent
     * frame stream with the current frame's start time equal to the
     * previous frame's stop time.
     */
    if( pv->last_stop != in->s.start )
    {
        hb_log("encx264 input continuity err: last stop %"PRId64"  start %"PRId64,
                pv->last_stop, in->s.start);
    }
    pv->last_stop = in->s.stop;

    // Remember info about this frame that we need to pass across
    // the x264_encoder_encode call (since it reorders frames).
    save_frame_info( pv, in );

    /* Feed the input PTS to x264 so it can figure out proper output PTS */
    pv->pic_in.i_pts = in->s.start;

    x264_picture_t pic_out;
    int i_nal;
    x264_nal_t *nal;

    x264_encoder_encode( pv->x264, &nal, &i_nal, &pv->pic_in, &pic_out );
    if ( i_nal > 0 )
    {
        return nal_encode( w, &pic_out, i_nal, nal );
    }
    return NULL;
}

int encx264Work( hb_work_object_t * w, hb_buffer_t ** buf_in,
                  hb_buffer_t ** buf_out )
{
    hb_work_private_t *pv = w->private_data;
    hb_buffer_t *in = *buf_in;

    *buf_out = NULL;

    if( in->size <= 0 )
    {
        // EOF on input. Flush any frames still in the decoder then
        // send the eof downstream to tell the muxer we're done.
        x264_picture_t pic_out;
        int i_nal;
        x264_nal_t *nal;
        hb_buffer_t *last_buf = NULL;

        while ( x264_encoder_delayed_frames( pv->x264 ) )
        {
            x264_encoder_encode( pv->x264, &nal, &i_nal, NULL, &pic_out );
            if ( i_nal == 0 )
                continue;
            if ( i_nal < 0 )
                break;

            hb_buffer_t *buf = nal_encode( w, &pic_out, i_nal, nal );
            if ( buf )
            {
                ++pv->frames_out;
                if ( last_buf == NULL )
                    *buf_out = buf;
                else
                    last_buf->next = buf;
                last_buf = buf;
            }
        }
        // Flushed everything - add the eof to the end of the chain.
        if ( last_buf == NULL )
            *buf_out = in;
        else
            last_buf->next = in;

        *buf_in = NULL;
        return HB_WORK_DONE;
    }

    // Not EOF - encode the packet & wrap it in a NAL
    ++pv->frames_in;
    ++pv->frames_out;
    *buf_out = x264_encode( w, in );
    return HB_WORK_OK;
}

/* Applies the restrictions of the requested H.264 level to the passed x264_param_t.
 * Does not modify resolution/framerate but warns when they exceed level limits.
 * No return value: an error or warning does not cause libhb to exit.
 * Based on x264_param_apply_level and other x264 code. */
void hb_apply_h264_level( x264_param_t * param, const char * level, const char * x264_profile )
{
    int i, h264_profile, i_mb_width, i_mb_height, mbs, max_frame_side;
    x264_level_t * h264_level = NULL;

    /* H.264 profile */
    h264_profile = -1; // Auto
    /* TODO: FIXME
     * we need to guess the profile like x264_sps_init does, otherwise we'll get
     * an error when setting a Main-incompatible VBV and x264_sps_init guesses
     * Main profile. x264_sps_init may eventually take VBV into account when
     * guessing profile, at which point this code can be re-enabled.
    if( x264_profile && *x264_profile )
    {
        // if the user explicitly specified a profile, don't guess it
        if( !strcasecmp( x264_profile, "high444" ) )
        {
            h264_profile = 2; // High 4:4:4 Predictive
        }
        else if( !strcasecmp( x264_profile, "main" ) ||
                 !strcasecmp( x264_profile, "baseline" ) )
        {
            h264_profile = 0; // less than High
        }
        else
        {
            for( i = 0; x264_profile_names[i]; i++ )
            {
                if( !strcasecmp( x264_profile, x264_profile_names[i] ) )
                {
                    h264_profile = 1; // High or equivalent
                    break;
                }
            }
            if( h264_profile == -1 )
            {
                hb_log( "hb_apply_h264_level [warning]: unsupported x264 profile %s, ignoring", x264_profile );
            }
        }
    }
     */

    /* find the x264_level_t corresponding to the requested level */
    if( level && *level )
    {
        for( i = 0; h264_level_names[i]; i++ )
        {
            if( !strcmp( h264_level_names[i], level ) )
            {
                int val = h264_level_values[i];
                for( i = 0; x264_levels[i].level_idc; i++ )
                {
                    if( x264_levels[i].level_idc == val )
                    {
                        h264_level = (x264_level_t *)(x264_levels + i);
                        break;
                    }
                }
                break;
            }
        }
        if( !h264_level )
        {
            // error (invalid or unsupported level), abort
            // this is not a failure (encoding continues)
            hb_log( "hb_apply_h264_level [ERROR]: invalid level %s, ignoring", level );
            return;
        }
    }
    else
    {
        // error (level not a string), abort
        // this is not a failure (encoding continues)
        hb_log( "hb_apply_h264_level [ERROR]: no level specified, ignoring" );
        return;
    }

    /* some levels do not support interlaced encoding */
    if( h264_level->frame_only && ( param->b_interlaced || param->b_fake_interlaced ) )
    {
        hb_log( "hb_apply_h264_level [warning]: interlaced flag not supported for level %s, disabling",
                level );
        param->b_interlaced = 0;
        param->b_fake_interlaced = 0;
    }

    /* frame dimensions & rate (in macroblocks) */
    i_mb_width  = ( param->i_width  + 15 ) / 16;
    i_mb_height = ( param->i_height + 15 ) / 16;
    if( param->b_interlaced || param->b_fake_interlaced )
    {
        // interlaced: i_mb_height * 16 must be mod 32
        i_mb_height = ( i_mb_height + 1 ) & ~1;
    }
    mbs = i_mb_width * i_mb_height;

    /* sanitize ref/frameref */
    if( param->i_keyint_max != 1 )
    {
        int i_max_dec_frame_buffering = MAX( MIN( h264_level->dpb / (384 * mbs), 16 ), 1 );
        param->i_frame_reference = MIN( i_max_dec_frame_buffering, param->i_frame_reference );
        // some level/resolution combinations may require as little as 1 reference
        // B-frames & B-pyramid are not compatible with this scenario
        if( i_max_dec_frame_buffering < 2 )
        {
            param->i_bframe = 0;
        }
        else if( i_max_dec_frame_buffering < 4 )
        {
            param->i_bframe_pyramid = X264_B_PYRAMID_NONE;
        }
    }

    /* guess the H.264 profile if the user didn't request one */
    if( h264_profile == -1 )
    {
        if( param->rc.i_rc_method == X264_RC_CRF && param->rc.f_rf_constant < 1 )
        {
            h264_profile = 2; // High 4:4:4 Predictive
        }
        else if( param->analyse.b_transform_8x8 || param->i_cqm_preset != X264_CQM_FLAT )
        {
            h264_profile = 1; // High
        }
        else
        {
            h264_profile = 0; // less than High
        }
    }

    /* set and/or sanitize the VBV (if not lossless) */
    if( h264_profile < 2 )
    {
        // High profile allows for higher VBV bufsize/maxrate
        int cbp_factor = h264_profile == 1 ? 5 : 4;
        if( !param->rc.i_vbv_max_bitrate)
        {
            param->rc.i_vbv_max_bitrate = (h264_level->bitrate * cbp_factor) / 4;
        }
        else
        {
            param->rc.i_vbv_max_bitrate =
                MIN( param->rc.i_vbv_max_bitrate, (h264_level->bitrate * cbp_factor) / 4 );
        }
        if( !param->rc.i_vbv_buffer_size )
        {
            param->rc.i_vbv_buffer_size = (h264_level->cpb * cbp_factor) / 4;
        }
        else
        {
            param->rc.i_vbv_buffer_size =
                MIN( param->rc.i_vbv_buffer_size, (h264_level->cpb * cbp_factor) / 4 );
        }
    }

    /* sanitize mvrange/mv-range */
    param->analyse.i_mv_range =
        MIN( param->analyse.i_mv_range, h264_level->mv_range >> !!param->b_interlaced );

    /* TODO: check the rest of the limits */

    /* level successfully applied, yay! */
    param->i_level_idc = h264_level->level_idc;

    /* things we can do nothing about (too late to change resolution or fps), print warnings */
    if( h264_level->frame_size < mbs  )
    {
        hb_log( "hb_apply_h264_level [warning]: frame size (%dx%d, %d macroblocks)",
                i_mb_width*16, i_mb_height*16, mbs );
        hb_log( "                               too high for level %s (max. %d macroblocks)",
                level, h264_level->frame_size );
    }
    else if( h264_level->mbps < (int64_t)mbs * param->i_fps_num / param->i_fps_den )
    {
        hb_log( "hb_apply_h264_level [warning]: framerate (%.3f) too high for level %s",
                (float)param->i_fps_num/param->i_fps_den, level );
        hb_log( "                               at %dx%d (max. %.3f)",
                 param->i_width, param->i_height, (float)h264_level->mbps/mbs );
    }
    // width^2 or height^2 may not exceed 8 * frame_size (in macroblocks)
    // thus neither dimension may exceed sqrt(8 * frame_size)
    max_frame_side = (int)sqrt( (double)h264_level->frame_size*8 );
    if( h264_level->frame_size*8 < i_mb_width * i_mb_width )
    {
        hb_log( "hb_apply_h264_level [warning]: frame too wide (%d) for level %s (max. %d)",
                param->i_width, level, max_frame_side*16 );
    }
    if( h264_level->frame_size*8 < i_mb_height * i_mb_height )
    {
        hb_log( "hb_apply_h264_level [warning]: frame too wide (%d) for level %s (max. %d)",
                param->i_height, level, max_frame_side*16 );
    }
}

const char * const * hb_x264_presets()
{
    return x264_preset_names;
}

const char * const * hb_x264_tunes()
{
    return x264_tune_names;
}

const char * const * hb_x264_profiles()
{
    return x264_profile_names;
}

const char * const * hb_h264_levels()
{
    return h264_level_names;
}

const char * hb_x264_encopt_name( const char * name )
{
    int i;
    for( i = 0; x264_encopt_synonyms[i] && x264_encopt_synonyms[i+1]; i += 2 )
        if( !strcmp( name, x264_encopt_synonyms[i+1] ) )
            return x264_encopt_synonyms[i];
    return name;
}