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ffmpeg / libavcodec / xvidff.c @ 5509bffa

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1
/*
2
 * Interface to xvidcore for mpeg4 encoding
3
 * Copyright (c) 2004 Adam Thayer <krevnik@comcast.net>
4
 *
5
 * This library is free software; you can redistribute it and/or
6
 * modify it under the terms of the GNU Lesser General Public
7
 * License as published by the Free Software Foundation; either
8
 * version 2 of the License, or (at your option) any later version.
9
 *
10
 * This library is distributed in the hope that it will be useful,
11
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13
 * Lesser General Public License for more details.
14
 *
15
 * You should have received a copy of the GNU Lesser General Public
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 * License along with this library; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
18
 */
19

    
20
/**
21
 * @file xvidmpeg4.c
22
 * Interface to xvidcore for MPEG-4 compliant encoding.
23
 * @author Adam Thayer (krevnik@comcast.net)
24
 */
25

    
26
#include <xvid.h>
27
#include <unistd.h>
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#include "common.h"
29
#include "avcodec.h"
30
#ifdef CONFIG_WIN32
31
#include <fcntl.h>
32
#endif
33

    
34
/**
35
 * Buffer management macros.
36
 */
37
#define BUFFER_SIZE                 1024
38
#define BUFFER_REMAINING(x)         (BUFFER_SIZE - strlen(x))
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#define BUFFER_CAT(x)               (&((x)[strlen(x)]))
40

    
41
/* For PPC Use */
42
#if HAVE_ALTIVEC==1
43
extern int has_altivec(void);
44
#endif
45

    
46
/**
47
 * Structure for the private XviD context.
48
 * This stores all the private context for the codec.
49
 */
50
typedef struct xvid_context {
51
    void *encoder_handle;          /** Handle for XviD Encoder */
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    int xsize, ysize;              /** Frame size */
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    int vop_flags;                 /** VOP flags for XviD Encoder */
54
    int vol_flags;                 /** VOL flags for XviD Encoder */
55
    int me_flags;                  /** Motion Estimation flags */
56
    int qscale;                    /** Do we use constant scale? */
57
    int quicktime_format;          /** Are we in a QT-based format? */
58
    AVFrame encoded_picture;       /** Encoded frame information */
59
    char *twopassbuffer;           /** Character buffer for two-pass */
60
    char *old_twopassbuffer;       /** Old character buffer (two-pass) */
61
    char *twopassfile;             /** second pass temp file name */
62
    unsigned char *intra_matrix;   /** P-Frame Quant Matrix */
63
    unsigned char *inter_matrix;   /** I-Frame Quant Matrix */
64
} xvid_context_t;
65

    
66
/**
67
 * Structure for the private first-pass plugin.
68
 */
69
typedef struct xvid_ff_pass1 {
70
    int     version;                /** XviD version */
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    xvid_context_t *context;        /** Pointer to private context */
72
} xvid_ff_pass1_t;
73

    
74
/* Prototypes - See function implementation for details */
75
int xvid_strip_vol_header(AVCodecContext *avctx, unsigned char *frame, unsigned int header_len, unsigned int frame_len);
76
int xvid_ff_2pass(void *ref, int opt, void *p1, void *p2);
77
void xvid_correct_framerate(AVCodecContext *avctx);
78

    
79
/**
80
 * Creates the private context for the encoder.
81
 * All buffers are allocated, settings are loaded from the user,
82
 * and the encoder context created.
83
 *
84
 * @param avctx AVCodecContext pointer to context
85
 * @return Returns 0 on success, -1 on failure
86
 */
87
int ff_xvid_encode_init(AVCodecContext *avctx)  {
88
    int xerr, i;
89
    int xvid_flags = avctx->flags;
90
    xvid_context_t *x = avctx->priv_data;
91
    uint16_t *intra, *inter;
92
    int fd;
93

    
94
    xvid_plugin_single_t single;
95
    xvid_ff_pass1_t rc2pass1;
96
    xvid_plugin_2pass2_t rc2pass2;
97
    xvid_gbl_init_t xvid_gbl_init;
98
    xvid_enc_create_t xvid_enc_create;
99
    xvid_enc_plugin_t plugins[7];
100

    
101
    /* Bring in VOP flags from ffmpeg command-line */
102
    x->vop_flags = XVID_VOP_HALFPEL; /* Bare minimum quality */
103
    if( xvid_flags & CODEC_FLAG_4MV )
104
        x->vop_flags |= XVID_VOP_INTER4V; /* Level 3 */
105
    if( xvid_flags & CODEC_FLAG_TRELLIS_QUANT)
106
        x->vop_flags |= XVID_VOP_TRELLISQUANT; /* Level 5 */
107
    if( xvid_flags & CODEC_FLAG_AC_PRED )
108
        x->vop_flags |= XVID_VOP_HQACPRED; /* Level 6 */
109
    if( xvid_flags & CODEC_FLAG_GRAY )
110
        x->vop_flags |= XVID_VOP_GREYSCALE;
111

    
112
    /* Decide which ME quality setting to use */
113
    x->me_flags = 0;
114
    switch( avctx->me_method ) {
115
       case ME_FULL:   /* Quality 6 */
116
           x->me_flags |=  XVID_ME_EXTSEARCH16
117
                       |   XVID_ME_EXTSEARCH8;
118

    
119
       case ME_EPZS:   /* Quality 4 */
120
           x->me_flags |=  XVID_ME_ADVANCEDDIAMOND8
121
                       |   XVID_ME_HALFPELREFINE8
122
                       |   XVID_ME_CHROMA_PVOP
123
                       |   XVID_ME_CHROMA_BVOP;
124

    
125
       case ME_LOG:    /* Quality 2 */
126
       case ME_PHODS:
127
       case ME_X1:
128
           x->me_flags |=  XVID_ME_ADVANCEDDIAMOND16
129
                       |   XVID_ME_HALFPELREFINE16;
130

    
131
       case ME_ZERO:   /* Quality 0 */
132
       default:
133
           break;
134
    }
135

    
136
    /* Decide how we should decide blocks */
137
    switch( avctx->mb_decision ) {
138
       case 2:
139
           x->vop_flags |= XVID_VOP_MODEDECISION_RD;
140
           x->me_flags |=  XVID_ME_HALFPELREFINE8_RD
141
                       |   XVID_ME_QUARTERPELREFINE8_RD
142
                       |   XVID_ME_EXTSEARCH_RD
143
                       |   XVID_ME_CHECKPREDICTION_RD;
144
       case 1:
145
           if( !(x->vop_flags & XVID_VOP_MODEDECISION_RD) )
146
               x->vop_flags |= XVID_VOP_FAST_MODEDECISION_RD;
147
           x->me_flags |=  XVID_ME_HALFPELREFINE16_RD
148
                       |   XVID_ME_QUARTERPELREFINE16_RD;
149

    
150
       default:
151
           break;
152
    }
153

    
154
    /* Bring in VOL flags from ffmpeg command-line */
155
    x->vol_flags = 0;
156
    if( xvid_flags & CODEC_FLAG_GMC ) {
157
        x->vol_flags |= XVID_VOL_GMC;
158
        x->me_flags |= XVID_ME_GME_REFINE;
159
    }
160
    if( xvid_flags & CODEC_FLAG_QPEL ) {
161
        x->vol_flags |= XVID_VOL_QUARTERPEL;
162
        x->me_flags |= XVID_ME_QUARTERPELREFINE16;
163
        if( x->vop_flags & XVID_VOP_INTER4V )
164
            x->me_flags |= XVID_ME_QUARTERPELREFINE8;
165
    }
166

    
167
    memset(&xvid_gbl_init, 0, sizeof(xvid_gbl_init));
168
    xvid_gbl_init.version = XVID_VERSION;
169
    xvid_gbl_init.debug = 0;
170

    
171
#ifdef ARCH_POWERPC
172
    /* XviD's PPC support is borked, use libavcodec to detect */
173
#if HAVE_ALTIVEC==1
174
    if( has_altivec() ) {
175
        xvid_gbl_init.cpu_flags = XVID_CPU_FORCE | XVID_CPU_ALTIVEC;
176
    } else
177
#endif
178
        xvid_gbl_init.cpu_flags = XVID_CPU_FORCE;
179
#else
180
    /* XviD can detect on x86 */
181
    xvid_gbl_init.cpu_flags = 0;
182
#endif
183

    
184
    /* Initialize */
185
    xvid_global(NULL, XVID_GBL_INIT, &xvid_gbl_init, NULL);
186

    
187
    /* Create the encoder reference */
188
    memset(&xvid_enc_create, 0, sizeof(xvid_enc_create));
189
    xvid_enc_create.version = XVID_VERSION;
190

    
191
    /* Store the desired frame size */
192
    xvid_enc_create.width = x->xsize = avctx->width;
193
    xvid_enc_create.height = x->ysize = avctx->height;
194

    
195
    /* XviD can determine the proper profile to use */
196
    /* xvid_enc_create.profile = XVID_PROFILE_S_L3; */
197

    
198
    /* We don't use zones or threads */
199
    xvid_enc_create.zones = NULL;
200
    xvid_enc_create.num_zones = 0;
201
    xvid_enc_create.num_threads = 0;
202

    
203
    xvid_enc_create.plugins = plugins;
204
    xvid_enc_create.num_plugins = 0;
205

    
206
    /* Initialize Buffers */
207
    x->twopassbuffer = NULL;
208
    x->old_twopassbuffer = NULL;
209
    x->twopassfile = NULL;
210

    
211
    if( xvid_flags & CODEC_FLAG_PASS1 ) {
212
        memset(&rc2pass1, 0, sizeof(xvid_ff_pass1_t));
213
        rc2pass1.version = XVID_VERSION;
214
        rc2pass1.context = x;
215
        x->twopassbuffer = av_malloc(BUFFER_SIZE);
216
        x->old_twopassbuffer = av_malloc(BUFFER_SIZE);
217
        if( x->twopassbuffer == NULL || x->old_twopassbuffer == NULL ) {
218
            av_log(avctx, AV_LOG_ERROR,
219
                "XviD: Cannot allocate 2-pass log buffers\n");
220
            return -1;
221
        }
222
        x->twopassbuffer[0] = x->old_twopassbuffer[0] = 0;
223

    
224
        plugins[xvid_enc_create.num_plugins].func = xvid_ff_2pass;
225
        plugins[xvid_enc_create.num_plugins].param = &rc2pass1;
226
        xvid_enc_create.num_plugins++;
227
    } else if( xvid_flags & CODEC_FLAG_PASS2 ) {
228
        memset(&rc2pass2, 0, sizeof(xvid_plugin_2pass2_t));
229
        rc2pass2.version = XVID_VERSION;
230
        rc2pass2.bitrate = avctx->bit_rate;
231

    
232
#ifdef CONFIG_WIN32 /* Ugly work around */
233
        {
234
           char *tempname;
235

    
236
           tempname = tempnam(".", "xvidff");
237
            fd = -1;
238
            if( tempname &&
239
                (fd = open(tempname, _O_RDWR | _O_BINARY)) != -1 ) {
240
                x->twopassfile = av_strdup(tempname);
241
#undef free
242
                free(tempname);
243
#define free please_use_av_free
244
                if( x->twopassfile == NULL ) {
245
                    av_log(avctx, AV_LOG_ERROR,
246
                        "XviD: Cannot allocate 2-pass buffer\n");
247
                    return -1;
248
                }
249
            }
250
       }
251
#else
252
        x->twopassfile = av_malloc(BUFFER_SIZE);
253
        if( x->twopassfile == NULL ) {
254
            av_log(avctx, AV_LOG_ERROR,
255
                "XviD: Cannot allocate 2-pass buffer\n");
256
            return -1;
257
        }
258
        strcpy(x->twopassfile, "/tmp/xvidff.XXXXXX");
259
        fd = mkstemp(x->twopassfile);
260
        if(fd < 0){
261
            strcpy(x->twopassfile, "./xvidff.XXXXXX");
262
            fd = mkstemp(x->twopassfile);
263
        }
264
#endif
265
        if( fd == -1 ) {
266
            av_log(avctx, AV_LOG_ERROR,
267
                "XviD: Cannot write 2-pass pipe\n");
268
            return -1;
269
        }
270

    
271
        if( avctx->stats_in == NULL ) {
272
            av_log(avctx, AV_LOG_ERROR,
273
                "XviD: No 2-pass information loaded for second pass\n");
274
            return -1;
275
        }
276

    
277
        if( strlen(avctx->stats_in) >
278
              write(fd, avctx->stats_in, strlen(avctx->stats_in)) ) {
279
            close(fd);
280
            av_log(avctx, AV_LOG_ERROR,
281
                "XviD: Cannot write to 2-pass pipe\n");
282
            return -1;
283
        }
284

    
285
        close(fd);
286
        rc2pass2.filename = x->twopassfile;
287
        plugins[xvid_enc_create.num_plugins].func = xvid_plugin_2pass2;
288
        plugins[xvid_enc_create.num_plugins].param = &rc2pass2;
289
        xvid_enc_create.num_plugins++;
290
    } else if( !(xvid_flags & CODEC_FLAG_QSCALE) ) {
291
        /* Single Pass Bitrate Control! */
292
        memset(&single, 0, sizeof(xvid_plugin_single_t));
293
        single.version = XVID_VERSION;
294
        single.bitrate = avctx->bit_rate;
295

    
296
        plugins[xvid_enc_create.num_plugins].func = xvid_plugin_single;
297
        plugins[xvid_enc_create.num_plugins].param = &single;
298
        xvid_enc_create.num_plugins++;
299
    }
300

    
301
    /* Luminance Masking */
302
    if( 0.0 != avctx->lumi_masking ) {
303
        plugins[xvid_enc_create.num_plugins].func = xvid_plugin_lumimasking;
304
        plugins[xvid_enc_create.num_plugins].param = NULL;
305
        xvid_enc_create.num_plugins++;
306
    }
307

    
308
    /* Frame Rate and Key Frames */
309
    xvid_correct_framerate(avctx);
310
    xvid_enc_create.fincr = avctx->time_base.num;
311
    xvid_enc_create.fbase = avctx->time_base.den;
312
    if( avctx->gop_size > 0 )
313
        xvid_enc_create.max_key_interval = avctx->gop_size;
314
    else
315
        xvid_enc_create.max_key_interval = 240; /* XviD's best default */
316

    
317
    /* Quants */
318
    if( xvid_flags & CODEC_FLAG_QSCALE ) x->qscale = 1;
319
    else x->qscale = 0;
320

    
321
    xvid_enc_create.min_quant[0] = avctx->qmin;
322
    xvid_enc_create.min_quant[1] = avctx->qmin;
323
    xvid_enc_create.min_quant[2] = avctx->qmin;
324
    xvid_enc_create.max_quant[0] = avctx->qmax;
325
    xvid_enc_create.max_quant[1] = avctx->qmax;
326
    xvid_enc_create.max_quant[2] = avctx->qmax;
327

    
328
    /* Quant Matrices */
329
    x->intra_matrix = x->inter_matrix = NULL;
330
    if( avctx->mpeg_quant )
331
       x->vol_flags |= XVID_VOL_MPEGQUANT;
332
    if( (avctx->intra_matrix || avctx->inter_matrix) ) {
333
       x->vol_flags |= XVID_VOL_MPEGQUANT;
334

    
335
       if( avctx->intra_matrix ) {
336
           intra = avctx->intra_matrix;
337
           x->intra_matrix = av_malloc(sizeof(unsigned char) * 64);
338
       } else
339
           intra = NULL;
340
       if( avctx->inter_matrix ) {
341
           inter = avctx->inter_matrix;
342
           x->inter_matrix = av_malloc(sizeof(unsigned char) * 64);
343
       } else
344
           inter = NULL;
345

    
346
       for( i = 0; i < 64; i++ ) {
347
           if( intra )
348
               x->intra_matrix[i] = (unsigned char)intra[i];
349
           if( inter )
350
               x->inter_matrix[i] = (unsigned char)inter[i];
351
       }
352
    }
353

    
354
    /* Misc Settings */
355
    xvid_enc_create.frame_drop_ratio = 0;
356
    xvid_enc_create.global = 0;
357
    if( xvid_flags & CODEC_FLAG_CLOSED_GOP )
358
        xvid_enc_create.global |= XVID_GLOBAL_CLOSED_GOP;
359

    
360
    /* Determines which codec mode we are operating in */
361
    avctx->extradata = NULL;
362
    avctx->extradata_size = 0;
363
    if( xvid_flags & CODEC_FLAG_GLOBAL_HEADER ) {
364
        /* In this case, we are claiming to be MPEG4 */
365
        x->quicktime_format = 1;
366
        avctx->codec_id = CODEC_ID_MPEG4;
367
    } else {
368
        /* We are claiming to be XviD */
369
        x->quicktime_format = 0;
370
        avctx->codec_tag = ff_get_fourcc("xvid");
371
    }
372

    
373
    /* Bframes */
374
    xvid_enc_create.max_bframes = avctx->max_b_frames;
375
    xvid_enc_create.bquant_offset = avctx->b_quant_offset;
376
    xvid_enc_create.bquant_ratio = 100 * avctx->b_quant_factor;
377
    if( avctx->max_b_frames > 0  && !x->quicktime_format ) xvid_enc_create.global |= XVID_GLOBAL_PACKED;
378

    
379
    /* Create encoder context */
380
    xerr = xvid_encore(NULL, XVID_ENC_CREATE, &xvid_enc_create, NULL);
381
    if( xerr ) {
382
        av_log(avctx, AV_LOG_ERROR, "XviD: Could not create encoder reference\n");
383
        return -1;
384
    }
385

    
386
    x->encoder_handle = xvid_enc_create.handle;
387
    avctx->coded_frame = &x->encoded_picture;
388

    
389
    return 0;
390
}
391

    
392
/**
393
 * Encodes a single frame.
394
 *
395
 * @param avctx AVCodecContext pointer to context
396
 * @param frame Pointer to encoded frame buffer
397
 * @param buf_size Size of encoded frame buffer
398
 * @param data Pointer to AVFrame of unencoded frame
399
 * @return Returns 0 on success, -1 on failure
400
 */
401
int ff_xvid_encode_frame(AVCodecContext *avctx,
402
                         unsigned char *frame, int buf_size, void *data) {
403
    int xerr, i;
404
    char *tmp;
405
    xvid_context_t *x = avctx->priv_data;
406
    AVFrame *picture = data;
407
    AVFrame *p = &(x->encoded_picture);
408

    
409
    xvid_enc_frame_t xvid_enc_frame;
410
    xvid_enc_stats_t xvid_enc_stats;
411

    
412
    /* Start setting up the frame */
413
    memset(&xvid_enc_frame, 0, sizeof(xvid_enc_frame));
414
    xvid_enc_frame.version = XVID_VERSION;
415
    memset(&xvid_enc_stats, 0, sizeof(xvid_enc_stats));
416
    xvid_enc_stats.version = XVID_VERSION;
417
    *p = *picture;
418

    
419
    /* Let XviD know where to put the frame. */
420
    xvid_enc_frame.bitstream = frame;
421
    xvid_enc_frame.length = buf_size;
422

    
423
    /* Initialize input image fields */
424
    if( avctx->pix_fmt != PIX_FMT_YUV420P ) {
425
        av_log(avctx, AV_LOG_ERROR, "XviD: Color spaces other than 420p not supported\n");
426
        return -1;
427
    }
428

    
429
    xvid_enc_frame.input.csp = XVID_CSP_PLANAR; /* YUV420P */
430

    
431
    for( i = 0; i < 4; i++ ) {
432
        xvid_enc_frame.input.plane[i] = picture->data[i];
433
        xvid_enc_frame.input.stride[i] = picture->linesize[i];
434
    }
435

    
436
    /* Encoder Flags */
437
    xvid_enc_frame.vop_flags = x->vop_flags;
438
    xvid_enc_frame.vol_flags = x->vol_flags;
439
    xvid_enc_frame.motion = x->me_flags;
440
    xvid_enc_frame.type = XVID_TYPE_AUTO;
441

    
442
    /* Quant Setting */
443
    if( x->qscale ) xvid_enc_frame.quant = picture->quality / FF_QP2LAMBDA;
444
    else xvid_enc_frame.quant = 0;
445

    
446
    /* Matrices */
447
    xvid_enc_frame.quant_intra_matrix = x->intra_matrix;
448
    xvid_enc_frame.quant_inter_matrix = x->inter_matrix;
449

    
450
    /* Encode */
451
    xerr = xvid_encore(x->encoder_handle, XVID_ENC_ENCODE,
452
        &xvid_enc_frame, &xvid_enc_stats);
453

    
454
    /* Two-pass log buffer swapping */
455
    avctx->stats_out = NULL;
456
    if( x->twopassbuffer ) {
457
        tmp = x->old_twopassbuffer;
458
        x->old_twopassbuffer = x->twopassbuffer;
459
        x->twopassbuffer = tmp;
460
        x->twopassbuffer[0] = 0;
461
        if( x->old_twopassbuffer[0] != 0 ) {
462
            avctx->stats_out = x->old_twopassbuffer;
463
        }
464
    }
465

    
466
    if( 0 <= xerr ) {
467
        p->quality = xvid_enc_stats.quant * FF_QP2LAMBDA;
468
        if( xvid_enc_stats.type == XVID_TYPE_PVOP )
469
            p->pict_type = FF_P_TYPE;
470
        else if( xvid_enc_stats.type == XVID_TYPE_BVOP )
471
            p->pict_type = FF_B_TYPE;
472
        else if( xvid_enc_stats.type == XVID_TYPE_SVOP )
473
            p->pict_type = FF_S_TYPE;
474
        else
475
            p->pict_type = FF_I_TYPE;
476
        if( xvid_enc_frame.out_flags & XVID_KEYFRAME ) {
477
            p->key_frame = 1;
478
            if( x->quicktime_format )
479
                return xvid_strip_vol_header(avctx, frame,
480
                    xvid_enc_stats.hlength, xerr);
481
         } else
482
            p->key_frame = 0;
483

    
484
        return xerr;
485
    } else {
486
        av_log(avctx, AV_LOG_ERROR, "XviD: Encoding Error Occurred: %i\n", xerr);
487
        return -1;
488
    }
489
}
490

    
491
/**
492
 * Destroys the private context for the encoder.
493
 * All buffers are freed, and the XviD encoder context is destroyed.
494
 *
495
 * @param avctx AVCodecContext pointer to context
496
 * @return Returns 0, success guaranteed
497
 */
498
int ff_xvid_encode_close(AVCodecContext *avctx) {
499
    xvid_context_t *x = avctx->priv_data;
500

    
501
    xvid_encore(x->encoder_handle, XVID_ENC_DESTROY, NULL, NULL);
502

    
503
    if( avctx->extradata != NULL )
504
        av_free(avctx->extradata);
505
    if( x->twopassbuffer != NULL ) {
506
        av_free(x->twopassbuffer);
507
        av_free(x->old_twopassbuffer);
508
    }
509
    if( x->twopassfile != NULL )
510
        av_free(x->twopassfile);
511
    if( x->intra_matrix != NULL )
512
        av_free(x->intra_matrix);
513
    if( x->inter_matrix != NULL )
514
        av_free(x->inter_matrix);
515

    
516
    return 0;
517
}
518

    
519
/**
520
 * Routine to create a global VO/VOL header for MP4 container.
521
 * What we do here is extract the header from the XviD bitstream
522
 * as it is encoded. We also strip the repeated headers from the
523
 * bitstream when a global header is requested for MPEG-4 ISO
524
 * compliance.
525
 *
526
 * @param avctx AVCodecContext pointer to context
527
 * @param frame Pointer to encoded frame data
528
 * @param header_len Length of header to search
529
 * @param frame_len Length of encoded frame data
530
 * @return Returns new length of frame data
531
 */
532
int xvid_strip_vol_header(AVCodecContext *avctx,
533
                  unsigned char *frame,
534
                  unsigned int header_len,
535
                  unsigned int frame_len) {
536
    int vo_len = 0, i;
537

    
538
    for( i = 0; i < header_len - 3; i++ ) {
539
        if( frame[i] == 0x00 &&
540
            frame[i+1] == 0x00 &&
541
            frame[i+2] == 0x01 &&
542
            frame[i+3] == 0xB6 ) {
543
            vo_len = i;
544
            break;
545
        }
546
    }
547

    
548
    if( vo_len > 0 ) {
549
        /* We need to store the header, so extract it */
550
        if( avctx->extradata == NULL ) {
551
            avctx->extradata = av_malloc(vo_len);
552
            memcpy(avctx->extradata, frame, vo_len);
553
            avctx->extradata_size = vo_len;
554
        }
555
        /* Less dangerous now, memmove properly copies the two
556
           chunks of overlapping data */
557
        memmove(frame, &(frame[vo_len]), frame_len - vo_len);
558
        return frame_len - vo_len;
559
    } else
560
        return frame_len;
561
}
562

    
563
/**
564
 * Routine to correct a possibly erroneous framerate being fed to us.
565
 * XviD currently chokes on framerates where the ticks per frame is
566
 * extremely large. This function works to correct problems in this area
567
 * by estimating a new framerate and taking the simpler fraction of
568
 * the two presented.
569
 *
570
 * @param avctx Context that contains the framerate to correct.
571
 */
572
void xvid_correct_framerate(AVCodecContext *avctx) {
573
    int frate, fbase;
574
    int est_frate, est_fbase;
575
    int gcd;
576
    float est_fps, fps;
577

    
578
    frate = avctx->time_base.den;
579
    fbase = avctx->time_base.num;
580

    
581
    gcd = ff_gcd(frate, fbase);
582
    if( gcd > 1 ) {
583
        frate /= gcd;
584
        fbase /= gcd;
585
    }
586

    
587
    if( frate <= 65000 && fbase <= 65000 ) {
588
        avctx->time_base.den = frate;
589
        avctx->time_base.num = fbase;
590
        return;
591
    }
592

    
593
    fps = (float)frate / (float)fbase;
594
    est_fps = roundf(fps * 1000.0) / 1000.0;
595

    
596
    est_frate = (int)est_fps;
597
    if( est_fps > (int)est_fps ) {
598
        est_frate = (est_frate + 1) * 1000;
599
        est_fbase = (int)roundf((float)est_frate / est_fps);
600
    } else
601
        est_fbase = 1;
602

    
603
    gcd = ff_gcd(est_frate, est_fbase);
604
    if( gcd > 1 ) {
605
        est_frate /= gcd;
606
        est_fbase /= gcd;
607
    }
608

    
609
    if( fbase > est_fbase ) {
610
        avctx->time_base.den = est_frate;
611
        avctx->time_base.num = est_fbase;
612
        av_log(avctx, AV_LOG_DEBUG,
613
            "XviD: framerate re-estimated: %.2f, %.3f%% correction\n",
614
            est_fps, (((est_fps - fps)/fps) * 100.0));
615
    } else {
616
        avctx->time_base.den = frate;
617
        avctx->time_base.num = fbase;
618
    }
619
}
620

    
621
/*
622
 * XviD 2-Pass Kludge Section
623
 *
624
 * XviD's default 2-pass doesn't allow us to create data as we need to, so
625
 * this section spends time replacing the first pass plugin so we can write
626
 * statistic information as libavcodec requests in. We have another kludge
627
 * that allows us to pass data to the second pass in XviD without a custom
628
 * rate-control plugin.
629
 */
630

    
631
/**
632
 * Initializes the two-pass plugin and context.
633
 *
634
 * @param param Input construction parameter structure
635
 * @param handle Private context handle
636
 * @return Returns XVID_ERR_xxxx on failure, or 0 on success.
637
 */
638
static int xvid_ff_2pass_create(xvid_plg_create_t * param,
639
                                void ** handle) {
640
    xvid_ff_pass1_t *x = (xvid_ff_pass1_t *)param->param;
641
    char *log = x->context->twopassbuffer;
642

    
643
    /* Do a quick bounds check */
644
    if( log == NULL )
645
        return XVID_ERR_FAIL;
646

    
647
    /* We use snprintf() */
648
    /* This is because we can safely prevent a buffer overflow */
649
    log[0] = 0;
650
    snprintf(log, BUFFER_REMAINING(log),
651
        "# ffmpeg 2-pass log file, using xvid codec\n");
652
    snprintf(BUFFER_CAT(log), BUFFER_REMAINING(log),
653
        "# Do not modify. libxvidcore version: %d.%d.%d\n\n",
654
        XVID_VERSION_MAJOR(XVID_VERSION),
655
        XVID_VERSION_MINOR(XVID_VERSION),
656
        XVID_VERSION_PATCH(XVID_VERSION));
657

    
658
    *handle = x->context;
659
    return 0;
660
}
661

    
662
/**
663
 * Destroys the two-pass plugin context.
664
 *
665
 * @param ref Context pointer for the plugin
666
 * @param param Destrooy context
667
 * @return Returns 0, success guaranteed
668
 */
669
static int xvid_ff_2pass_destroy(xvid_context_t *ref,
670
                                xvid_plg_destroy_t *param) {
671
    /* Currently cannot think of anything to do on destruction */
672
    /* Still, the framework should be here for reference/use */
673
    if( ref->twopassbuffer != NULL )
674
        ref->twopassbuffer[0] = 0;
675
    return 0;
676
}
677

    
678
/**
679
 * Enables fast encode mode during the first pass.
680
 *
681
 * @param ref Context pointer for the plugin
682
 * @param param Frame data
683
 * @return Returns 0, success guaranteed
684
 */
685
static int xvid_ff_2pass_before(xvid_context_t *ref,
686
                                xvid_plg_data_t *param) {
687
    int motion_remove;
688
    int motion_replacements;
689
    int vop_remove;
690

    
691
    /* Nothing to do here, result is changed too much */
692
    if( param->zone && param->zone->mode == XVID_ZONE_QUANT )
693
        return 0;
694

    
695
    /* We can implement a 'turbo' first pass mode here */
696
    param->quant = 2;
697

    
698
    /* Init values */
699
    motion_remove = ~XVID_ME_CHROMA_PVOP &
700
                    ~XVID_ME_CHROMA_BVOP &
701
                    ~XVID_ME_EXTSEARCH16 &
702
                    ~XVID_ME_ADVANCEDDIAMOND16;
703
    motion_replacements = XVID_ME_FAST_MODEINTERPOLATE |
704
                          XVID_ME_SKIP_DELTASEARCH |
705
                          XVID_ME_FASTREFINE16 |
706
                          XVID_ME_BFRAME_EARLYSTOP;
707
    vop_remove = ~XVID_VOP_MODEDECISION_RD &
708
                 ~XVID_VOP_FAST_MODEDECISION_RD &
709
                 ~XVID_VOP_TRELLISQUANT &
710
                 ~XVID_VOP_INTER4V &
711
                 ~XVID_VOP_HQACPRED;
712

    
713
    param->vol_flags &= ~XVID_VOL_GMC;
714
    param->vop_flags &= vop_remove;
715
    param->motion_flags &= motion_remove;
716
    param->motion_flags |= motion_replacements;
717

    
718
    return 0;
719
}
720

    
721
/**
722
 * Captures statistic data and writes it during first pass.
723
 *
724
 * @param ref Context pointer for the plugin
725
 * @param param Statistic data
726
 * @return Returns XVID_ERR_xxxx on failure, or 0 on success
727
 */
728
static int xvid_ff_2pass_after(xvid_context_t *ref,
729
                                xvid_plg_data_t *param) {
730
    char *log = ref->twopassbuffer;
731
    char *frame_types = " ipbs";
732
    char frame_type;
733

    
734
    /* Quick bounds check */
735
    if( log == NULL )
736
        return XVID_ERR_FAIL;
737

    
738
    /* Convert the type given to us into a character */
739
    if( param->type < 5 && param->type > 0 ) {
740
        frame_type = frame_types[param->type];
741
    } else {
742
        return XVID_ERR_FAIL;
743
    }
744

    
745
    snprintf(BUFFER_CAT(log), BUFFER_REMAINING(log),
746
        "%c %d %d %d %d %d %d\n",
747
        frame_type, param->stats.quant, param->stats.kblks, param->stats.mblks,
748
        param->stats.ublks, param->stats.length, param->stats.hlength);
749

    
750
    return 0;
751
}
752

    
753
/**
754
 * Dispatch function for our custom plugin.
755
 * This handles the dispatch for the XviD plugin. It passes data
756
 * on to other functions for actual processing.
757
 *
758
 * @param ref Context pointer for the plugin
759
 * @param cmd The task given for us to complete
760
 * @param p1 First parameter (varies)
761
 * @param p2 Second parameter (varies)
762
 * @return Returns XVID_ERR_xxxx on failure, or 0 on success
763
 */
764
int xvid_ff_2pass(void *ref, int cmd, void *p1, void *p2) {
765
    switch( cmd ) {
766
        case XVID_PLG_INFO:
767
        case XVID_PLG_FRAME:
768
            return 0;
769

    
770
        case XVID_PLG_BEFORE:
771
            return xvid_ff_2pass_before(ref, p1);
772

    
773
        case XVID_PLG_CREATE:
774
            return xvid_ff_2pass_create(p1, p2);
775

    
776
        case XVID_PLG_AFTER:
777
            return xvid_ff_2pass_after(ref, p1);
778

    
779
        case XVID_PLG_DESTROY:
780
            return xvid_ff_2pass_destroy(ref, p1);
781

    
782
        default:
783
            return XVID_ERR_FAIL;
784
    }
785
}
786

    
787
/**
788
 * XviD codec definition for libavcodec.
789
 */
790
AVCodec xvid_encoder = {
791
    "xvid",
792
    CODEC_TYPE_VIDEO,
793
    CODEC_ID_XVID,
794
    sizeof(xvid_context_t),
795
    ff_xvid_encode_init,
796
    ff_xvid_encode_frame,
797
    ff_xvid_encode_close
798
};