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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
 *
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 * 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.
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 *
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 * 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
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 */
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"
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#include "avcodec.h"
30
#include "internal.h"
31

    
32
/**
33
 * Buffer management macros.
34
 */
35
#define BUFFER_SIZE                 1024
36
#define BUFFER_REMAINING(x)         (BUFFER_SIZE - strlen(x))
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#define BUFFER_CAT(x)               (&((x)[strlen(x)]))
38

    
39
/* For PPC Use */
40
#if HAVE_ALTIVEC==1
41
extern int has_altivec(void);
42
#endif
43

    
44
/**
45
 * Structure for the private XviD context.
46
 * This stores all the private context for the codec.
47
 */
48
typedef struct xvid_context {
49
    void *encoder_handle;          /** Handle for XviD Encoder */
50
    int xsize, ysize;              /** Frame size */
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    int vop_flags;                 /** VOP flags for XviD Encoder */
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    int vol_flags;                 /** VOL flags for XviD Encoder */
53
    int me_flags;                  /** Motion Estimation flags */
54
    int qscale;                    /** Do we use constant scale? */
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    int quicktime_format;          /** Are we in a QT-based format? */
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    AVFrame encoded_picture;       /** Encoded frame information */
57
    char *twopassbuffer;           /** Character buffer for two-pass */
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    char *old_twopassbuffer;       /** Old character buffer (two-pass) */
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    char *twopassfile;             /** second pass temp file name */
60
    unsigned char *intra_matrix;   /** P-Frame Quant Matrix */
61
    unsigned char *inter_matrix;   /** I-Frame Quant Matrix */
62
} xvid_context_t;
63

    
64
/**
65
 * Structure for the private first-pass plugin.
66
 */
67
typedef struct xvid_ff_pass1 {
68
    int     version;                /** XviD version */
69
    xvid_context_t *context;        /** Pointer to private context */
70
} xvid_ff_pass1_t;
71

    
72
/* Prototypes - See function implementation for details */
73
int xvid_strip_vol_header(AVCodecContext *avctx, unsigned char *frame, unsigned int header_len, unsigned int frame_len);
74
int xvid_ff_2pass(void *ref, int opt, void *p1, void *p2);
75
void xvid_correct_framerate(AVCodecContext *avctx);
76

    
77
/**
78
 * Creates the private context for the encoder.
79
 * All buffers are allocated, settings are loaded from the user,
80
 * and the encoder context created.
81
 *
82
 * @param avctx AVCodecContext pointer to context
83
 * @return Returns 0 on success, -1 on failure
84
 */
85
int ff_xvid_encode_init(AVCodecContext *avctx)  {
86
    int xerr, i;
87
    int xvid_flags = avctx->flags;
88
    xvid_context_t *x = avctx->priv_data;
89
    uint16_t *intra, *inter;
90
    int fd;
91

    
92
    xvid_plugin_single_t single;
93
    xvid_ff_pass1_t rc2pass1;
94
    xvid_plugin_2pass2_t rc2pass2;
95
    xvid_gbl_init_t xvid_gbl_init;
96
    xvid_enc_create_t xvid_enc_create;
97
    xvid_enc_plugin_t plugins[7];
98

    
99
    /* Bring in VOP flags from ffmpeg command-line */
100
    x->vop_flags = XVID_VOP_HALFPEL; /* Bare minimum quality */
101
    if( xvid_flags & CODEC_FLAG_4MV )
102
        x->vop_flags |= XVID_VOP_INTER4V; /* Level 3 */
103
    if( xvid_flags & CODEC_FLAG_TRELLIS_QUANT)
104
        x->vop_flags |= XVID_VOP_TRELLISQUANT; /* Level 5 */
105
    if( xvid_flags & CODEC_FLAG_AC_PRED )
106
        x->vop_flags |= XVID_VOP_HQACPRED; /* Level 6 */
107
    if( xvid_flags & CODEC_FLAG_GRAY )
108
        x->vop_flags |= XVID_VOP_GREYSCALE;
109

    
110
    /* Decide which ME quality setting to use */
111
    x->me_flags = 0;
112
    switch( avctx->me_method ) {
113
       case ME_FULL:   /* Quality 6 */
114
           x->me_flags |=  XVID_ME_EXTSEARCH16
115
                       |   XVID_ME_EXTSEARCH8;
116

    
117
       case ME_EPZS:   /* Quality 4 */
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           x->me_flags |=  XVID_ME_ADVANCEDDIAMOND8
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                       |   XVID_ME_HALFPELREFINE8
120
                       |   XVID_ME_CHROMA_PVOP
121
                       |   XVID_ME_CHROMA_BVOP;
122

    
123
       case ME_LOG:    /* Quality 2 */
124
       case ME_PHODS:
125
       case ME_X1:
126
           x->me_flags |=  XVID_ME_ADVANCEDDIAMOND16
127
                       |   XVID_ME_HALFPELREFINE16;
128

    
129
       case ME_ZERO:   /* Quality 0 */
130
       default:
131
           break;
132
    }
133

    
134
    /* Decide how we should decide blocks */
135
    switch( avctx->mb_decision ) {
136
       case 2:
137
           x->vop_flags |= XVID_VOP_MODEDECISION_RD;
138
           x->me_flags |=  XVID_ME_HALFPELREFINE8_RD
139
                       |   XVID_ME_QUARTERPELREFINE8_RD
140
                       |   XVID_ME_EXTSEARCH_RD
141
                       |   XVID_ME_CHECKPREDICTION_RD;
142
       case 1:
143
           if( !(x->vop_flags & XVID_VOP_MODEDECISION_RD) )
144
               x->vop_flags |= XVID_VOP_FAST_MODEDECISION_RD;
145
           x->me_flags |=  XVID_ME_HALFPELREFINE16_RD
146
                       |   XVID_ME_QUARTERPELREFINE16_RD;
147

    
148
       default:
149
           break;
150
    }
151

    
152
    /* Bring in VOL flags from ffmpeg command-line */
153
    x->vol_flags = 0;
154
    if( xvid_flags & CODEC_FLAG_GMC ) {
155
        x->vol_flags |= XVID_VOL_GMC;
156
        x->me_flags |= XVID_ME_GME_REFINE;
157
    }
158
    if( xvid_flags & CODEC_FLAG_QPEL ) {
159
        x->vol_flags |= XVID_VOL_QUARTERPEL;
160
        x->me_flags |= XVID_ME_QUARTERPELREFINE16;
161
        if( x->vop_flags & XVID_VOP_INTER4V )
162
            x->me_flags |= XVID_ME_QUARTERPELREFINE8;
163
    }
164

    
165
    memset(&xvid_gbl_init, 0, sizeof(xvid_gbl_init));
166
    xvid_gbl_init.version = XVID_VERSION;
167
    xvid_gbl_init.debug = 0;
168

    
169
#ifdef ARCH_POWERPC
170
    /* XviD's PPC support is borked, use libavcodec to detect */
171
#if HAVE_ALTIVEC==1
172
    if( has_altivec() ) {
173
        xvid_gbl_init.cpu_flags = XVID_CPU_FORCE | XVID_CPU_ALTIVEC;
174
    } else
175
#endif
176
        xvid_gbl_init.cpu_flags = XVID_CPU_FORCE;
177
#else
178
    /* XviD can detect on x86 */
179
    xvid_gbl_init.cpu_flags = 0;
180
#endif
181

    
182
    /* Initialize */
183
    xvid_global(NULL, XVID_GBL_INIT, &xvid_gbl_init, NULL);
184

    
185
    /* Create the encoder reference */
186
    memset(&xvid_enc_create, 0, sizeof(xvid_enc_create));
187
    xvid_enc_create.version = XVID_VERSION;
188

    
189
    /* Store the desired frame size */
190
    xvid_enc_create.width = x->xsize = avctx->width;
191
    xvid_enc_create.height = x->ysize = avctx->height;
192

    
193
    /* XviD can determine the proper profile to use */
194
    /* xvid_enc_create.profile = XVID_PROFILE_S_L3; */
195

    
196
    /* We don't use zones or threads */
197
    xvid_enc_create.zones = NULL;
198
    xvid_enc_create.num_zones = 0;
199
    xvid_enc_create.num_threads = 0;
200

    
201
    xvid_enc_create.plugins = plugins;
202
    xvid_enc_create.num_plugins = 0;
203

    
204
    /* Initialize Buffers */
205
    x->twopassbuffer = NULL;
206
    x->old_twopassbuffer = NULL;
207
    x->twopassfile = NULL;
208

    
209
    if( xvid_flags & CODEC_FLAG_PASS1 ) {
210
        memset(&rc2pass1, 0, sizeof(xvid_ff_pass1_t));
211
        rc2pass1.version = XVID_VERSION;
212
        rc2pass1.context = x;
213
        x->twopassbuffer = av_malloc(BUFFER_SIZE);
214
        x->old_twopassbuffer = av_malloc(BUFFER_SIZE);
215
        if( x->twopassbuffer == NULL || x->old_twopassbuffer == NULL ) {
216
            av_log(avctx, AV_LOG_ERROR,
217
                "XviD: Cannot allocate 2-pass log buffers\n");
218
            return -1;
219
        }
220
        x->twopassbuffer[0] = x->old_twopassbuffer[0] = 0;
221

    
222
        plugins[xvid_enc_create.num_plugins].func = xvid_ff_2pass;
223
        plugins[xvid_enc_create.num_plugins].param = &rc2pass1;
224
        xvid_enc_create.num_plugins++;
225
    } else if( xvid_flags & CODEC_FLAG_PASS2 ) {
226
        memset(&rc2pass2, 0, sizeof(xvid_plugin_2pass2_t));
227
        rc2pass2.version = XVID_VERSION;
228
        rc2pass2.bitrate = avctx->bit_rate;
229

    
230
        fd = av_tempfile("xvidff.", &(x->twopassfile));
231
        if( fd == -1 ) {
232
            av_log(avctx, AV_LOG_ERROR,
233
                "XviD: Cannot write 2-pass pipe\n");
234
            return -1;
235
        }
236

    
237
        if( avctx->stats_in == NULL ) {
238
            av_log(avctx, AV_LOG_ERROR,
239
                "XviD: No 2-pass information loaded for second pass\n");
240
            return -1;
241
        }
242

    
243
        if( strlen(avctx->stats_in) >
244
              write(fd, avctx->stats_in, strlen(avctx->stats_in)) ) {
245
            close(fd);
246
            av_log(avctx, AV_LOG_ERROR,
247
                "XviD: Cannot write to 2-pass pipe\n");
248
            return -1;
249
        }
250

    
251
        close(fd);
252
        rc2pass2.filename = x->twopassfile;
253
        plugins[xvid_enc_create.num_plugins].func = xvid_plugin_2pass2;
254
        plugins[xvid_enc_create.num_plugins].param = &rc2pass2;
255
        xvid_enc_create.num_plugins++;
256
    } else if( !(xvid_flags & CODEC_FLAG_QSCALE) ) {
257
        /* Single Pass Bitrate Control! */
258
        memset(&single, 0, sizeof(xvid_plugin_single_t));
259
        single.version = XVID_VERSION;
260
        single.bitrate = avctx->bit_rate;
261

    
262
        plugins[xvid_enc_create.num_plugins].func = xvid_plugin_single;
263
        plugins[xvid_enc_create.num_plugins].param = &single;
264
        xvid_enc_create.num_plugins++;
265
    }
266

    
267
    /* Luminance Masking */
268
    if( 0.0 != avctx->lumi_masking ) {
269
        plugins[xvid_enc_create.num_plugins].func = xvid_plugin_lumimasking;
270
        plugins[xvid_enc_create.num_plugins].param = NULL;
271
        xvid_enc_create.num_plugins++;
272
    }
273

    
274
    /* Frame Rate and Key Frames */
275
    xvid_correct_framerate(avctx);
276
    xvid_enc_create.fincr = avctx->time_base.num;
277
    xvid_enc_create.fbase = avctx->time_base.den;
278
    if( avctx->gop_size > 0 )
279
        xvid_enc_create.max_key_interval = avctx->gop_size;
280
    else
281
        xvid_enc_create.max_key_interval = 240; /* XviD's best default */
282

    
283
    /* Quants */
284
    if( xvid_flags & CODEC_FLAG_QSCALE ) x->qscale = 1;
285
    else x->qscale = 0;
286

    
287
    xvid_enc_create.min_quant[0] = avctx->qmin;
288
    xvid_enc_create.min_quant[1] = avctx->qmin;
289
    xvid_enc_create.min_quant[2] = avctx->qmin;
290
    xvid_enc_create.max_quant[0] = avctx->qmax;
291
    xvid_enc_create.max_quant[1] = avctx->qmax;
292
    xvid_enc_create.max_quant[2] = avctx->qmax;
293

    
294
    /* Quant Matrices */
295
    x->intra_matrix = x->inter_matrix = NULL;
296
    if( avctx->mpeg_quant )
297
       x->vol_flags |= XVID_VOL_MPEGQUANT;
298
    if( (avctx->intra_matrix || avctx->inter_matrix) ) {
299
       x->vol_flags |= XVID_VOL_MPEGQUANT;
300

    
301
       if( avctx->intra_matrix ) {
302
           intra = avctx->intra_matrix;
303
           x->intra_matrix = av_malloc(sizeof(unsigned char) * 64);
304
       } else
305
           intra = NULL;
306
       if( avctx->inter_matrix ) {
307
           inter = avctx->inter_matrix;
308
           x->inter_matrix = av_malloc(sizeof(unsigned char) * 64);
309
       } else
310
           inter = NULL;
311

    
312
       for( i = 0; i < 64; i++ ) {
313
           if( intra )
314
               x->intra_matrix[i] = (unsigned char)intra[i];
315
           if( inter )
316
               x->inter_matrix[i] = (unsigned char)inter[i];
317
       }
318
    }
319

    
320
    /* Misc Settings */
321
    xvid_enc_create.frame_drop_ratio = 0;
322
    xvid_enc_create.global = 0;
323
    if( xvid_flags & CODEC_FLAG_CLOSED_GOP )
324
        xvid_enc_create.global |= XVID_GLOBAL_CLOSED_GOP;
325

    
326
    /* Determines which codec mode we are operating in */
327
    avctx->extradata = NULL;
328
    avctx->extradata_size = 0;
329
    if( xvid_flags & CODEC_FLAG_GLOBAL_HEADER ) {
330
        /* In this case, we are claiming to be MPEG4 */
331
        x->quicktime_format = 1;
332
        avctx->codec_id = CODEC_ID_MPEG4;
333
    } else {
334
        /* We are claiming to be XviD */
335
        x->quicktime_format = 0;
336
        avctx->codec_tag = ff_get_fourcc("xvid");
337
    }
338

    
339
    /* Bframes */
340
    xvid_enc_create.max_bframes = avctx->max_b_frames;
341
    xvid_enc_create.bquant_offset = 100 * avctx->b_quant_offset;
342
    xvid_enc_create.bquant_ratio = 100 * avctx->b_quant_factor;
343
    if( avctx->max_b_frames > 0  && !x->quicktime_format ) xvid_enc_create.global |= XVID_GLOBAL_PACKED;
344

    
345
    /* Create encoder context */
346
    xerr = xvid_encore(NULL, XVID_ENC_CREATE, &xvid_enc_create, NULL);
347
    if( xerr ) {
348
        av_log(avctx, AV_LOG_ERROR, "XviD: Could not create encoder reference\n");
349
        return -1;
350
    }
351

    
352
    x->encoder_handle = xvid_enc_create.handle;
353
    avctx->coded_frame = &x->encoded_picture;
354

    
355
    return 0;
356
}
357

    
358
/**
359
 * Encodes a single frame.
360
 *
361
 * @param avctx AVCodecContext pointer to context
362
 * @param frame Pointer to encoded frame buffer
363
 * @param buf_size Size of encoded frame buffer
364
 * @param data Pointer to AVFrame of unencoded frame
365
 * @return Returns 0 on success, -1 on failure
366
 */
367
int ff_xvid_encode_frame(AVCodecContext *avctx,
368
                         unsigned char *frame, int buf_size, void *data) {
369
    int xerr, i;
370
    char *tmp;
371
    xvid_context_t *x = avctx->priv_data;
372
    AVFrame *picture = data;
373
    AVFrame *p = &(x->encoded_picture);
374

    
375
    xvid_enc_frame_t xvid_enc_frame;
376
    xvid_enc_stats_t xvid_enc_stats;
377

    
378
    /* Start setting up the frame */
379
    memset(&xvid_enc_frame, 0, sizeof(xvid_enc_frame));
380
    xvid_enc_frame.version = XVID_VERSION;
381
    memset(&xvid_enc_stats, 0, sizeof(xvid_enc_stats));
382
    xvid_enc_stats.version = XVID_VERSION;
383
    *p = *picture;
384

    
385
    /* Let XviD know where to put the frame. */
386
    xvid_enc_frame.bitstream = frame;
387
    xvid_enc_frame.length = buf_size;
388

    
389
    /* Initialize input image fields */
390
    if( avctx->pix_fmt != PIX_FMT_YUV420P ) {
391
        av_log(avctx, AV_LOG_ERROR, "XviD: Color spaces other than 420p not supported\n");
392
        return -1;
393
    }
394

    
395
    xvid_enc_frame.input.csp = XVID_CSP_PLANAR; /* YUV420P */
396

    
397
    for( i = 0; i < 4; i++ ) {
398
        xvid_enc_frame.input.plane[i] = picture->data[i];
399
        xvid_enc_frame.input.stride[i] = picture->linesize[i];
400
    }
401

    
402
    /* Encoder Flags */
403
    xvid_enc_frame.vop_flags = x->vop_flags;
404
    xvid_enc_frame.vol_flags = x->vol_flags;
405
    xvid_enc_frame.motion = x->me_flags;
406
    xvid_enc_frame.type = XVID_TYPE_AUTO;
407

    
408
    /* Quant Setting */
409
    if( x->qscale ) xvid_enc_frame.quant = picture->quality / FF_QP2LAMBDA;
410
    else xvid_enc_frame.quant = 0;
411

    
412
    /* Matrices */
413
    xvid_enc_frame.quant_intra_matrix = x->intra_matrix;
414
    xvid_enc_frame.quant_inter_matrix = x->inter_matrix;
415

    
416
    /* Encode */
417
    xerr = xvid_encore(x->encoder_handle, XVID_ENC_ENCODE,
418
        &xvid_enc_frame, &xvid_enc_stats);
419

    
420
    /* Two-pass log buffer swapping */
421
    avctx->stats_out = NULL;
422
    if( x->twopassbuffer ) {
423
        tmp = x->old_twopassbuffer;
424
        x->old_twopassbuffer = x->twopassbuffer;
425
        x->twopassbuffer = tmp;
426
        x->twopassbuffer[0] = 0;
427
        if( x->old_twopassbuffer[0] != 0 ) {
428
            avctx->stats_out = x->old_twopassbuffer;
429
        }
430
    }
431

    
432
    if( 0 <= xerr ) {
433
        p->quality = xvid_enc_stats.quant * FF_QP2LAMBDA;
434
        if( xvid_enc_stats.type == XVID_TYPE_PVOP )
435
            p->pict_type = FF_P_TYPE;
436
        else if( xvid_enc_stats.type == XVID_TYPE_BVOP )
437
            p->pict_type = FF_B_TYPE;
438
        else if( xvid_enc_stats.type == XVID_TYPE_SVOP )
439
            p->pict_type = FF_S_TYPE;
440
        else
441
            p->pict_type = FF_I_TYPE;
442
        if( xvid_enc_frame.out_flags & XVID_KEYFRAME ) {
443
            p->key_frame = 1;
444
            if( x->quicktime_format )
445
                return xvid_strip_vol_header(avctx, frame,
446
                    xvid_enc_stats.hlength, xerr);
447
         } else
448
            p->key_frame = 0;
449

    
450
        return xerr;
451
    } else {
452
        av_log(avctx, AV_LOG_ERROR, "XviD: Encoding Error Occurred: %i\n", xerr);
453
        return -1;
454
    }
455
}
456

    
457
/**
458
 * Destroys the private context for the encoder.
459
 * All buffers are freed, and the XviD encoder context is destroyed.
460
 *
461
 * @param avctx AVCodecContext pointer to context
462
 * @return Returns 0, success guaranteed
463
 */
464
int ff_xvid_encode_close(AVCodecContext *avctx) {
465
    xvid_context_t *x = avctx->priv_data;
466

    
467
    xvid_encore(x->encoder_handle, XVID_ENC_DESTROY, NULL, NULL);
468

    
469
    if( avctx->extradata != NULL )
470
        av_free(avctx->extradata);
471
    if( x->twopassbuffer != NULL ) {
472
        av_free(x->twopassbuffer);
473
        av_free(x->old_twopassbuffer);
474
    }
475
    if( x->twopassfile != NULL )
476
        av_free(x->twopassfile);
477
    if( x->intra_matrix != NULL )
478
        av_free(x->intra_matrix);
479
    if( x->inter_matrix != NULL )
480
        av_free(x->inter_matrix);
481

    
482
    return 0;
483
}
484

    
485
/**
486
 * Routine to create a global VO/VOL header for MP4 container.
487
 * What we do here is extract the header from the XviD bitstream
488
 * as it is encoded. We also strip the repeated headers from the
489
 * bitstream when a global header is requested for MPEG-4 ISO
490
 * compliance.
491
 *
492
 * @param avctx AVCodecContext pointer to context
493
 * @param frame Pointer to encoded frame data
494
 * @param header_len Length of header to search
495
 * @param frame_len Length of encoded frame data
496
 * @return Returns new length of frame data
497
 */
498
int xvid_strip_vol_header(AVCodecContext *avctx,
499
                  unsigned char *frame,
500
                  unsigned int header_len,
501
                  unsigned int frame_len) {
502
    int vo_len = 0, i;
503

    
504
    for( i = 0; i < header_len - 3; i++ ) {
505
        if( frame[i] == 0x00 &&
506
            frame[i+1] == 0x00 &&
507
            frame[i+2] == 0x01 &&
508
            frame[i+3] == 0xB6 ) {
509
            vo_len = i;
510
            break;
511
        }
512
    }
513

    
514
    if( vo_len > 0 ) {
515
        /* We need to store the header, so extract it */
516
        if( avctx->extradata == NULL ) {
517
            avctx->extradata = av_malloc(vo_len);
518
            memcpy(avctx->extradata, frame, vo_len);
519
            avctx->extradata_size = vo_len;
520
        }
521
        /* Less dangerous now, memmove properly copies the two
522
           chunks of overlapping data */
523
        memmove(frame, &(frame[vo_len]), frame_len - vo_len);
524
        return frame_len - vo_len;
525
    } else
526
        return frame_len;
527
}
528

    
529
/**
530
 * Routine to correct a possibly erroneous framerate being fed to us.
531
 * XviD currently chokes on framerates where the ticks per frame is
532
 * extremely large. This function works to correct problems in this area
533
 * by estimating a new framerate and taking the simpler fraction of
534
 * the two presented.
535
 *
536
 * @param avctx Context that contains the framerate to correct.
537
 */
538
void xvid_correct_framerate(AVCodecContext *avctx) {
539
    int frate, fbase;
540
    int est_frate, est_fbase;
541
    int gcd;
542
    float est_fps, fps;
543

    
544
    frate = avctx->time_base.den;
545
    fbase = avctx->time_base.num;
546

    
547
    gcd = ff_gcd(frate, fbase);
548
    if( gcd > 1 ) {
549
        frate /= gcd;
550
        fbase /= gcd;
551
    }
552

    
553
    if( frate <= 65000 && fbase <= 65000 ) {
554
        avctx->time_base.den = frate;
555
        avctx->time_base.num = fbase;
556
        return;
557
    }
558

    
559
    fps = (float)frate / (float)fbase;
560
    est_fps = roundf(fps * 1000.0) / 1000.0;
561

    
562
    est_frate = (int)est_fps;
563
    if( est_fps > (int)est_fps ) {
564
        est_frate = (est_frate + 1) * 1000;
565
        est_fbase = (int)roundf((float)est_frate / est_fps);
566
    } else
567
        est_fbase = 1;
568

    
569
    gcd = ff_gcd(est_frate, est_fbase);
570
    if( gcd > 1 ) {
571
        est_frate /= gcd;
572
        est_fbase /= gcd;
573
    }
574

    
575
    if( fbase > est_fbase ) {
576
        avctx->time_base.den = est_frate;
577
        avctx->time_base.num = est_fbase;
578
        av_log(avctx, AV_LOG_DEBUG,
579
            "XviD: framerate re-estimated: %.2f, %.3f%% correction\n",
580
            est_fps, (((est_fps - fps)/fps) * 100.0));
581
    } else {
582
        avctx->time_base.den = frate;
583
        avctx->time_base.num = fbase;
584
    }
585
}
586

    
587
/*
588
 * XviD 2-Pass Kludge Section
589
 *
590
 * XviD's default 2-pass doesn't allow us to create data as we need to, so
591
 * this section spends time replacing the first pass plugin so we can write
592
 * statistic information as libavcodec requests in. We have another kludge
593
 * that allows us to pass data to the second pass in XviD without a custom
594
 * rate-control plugin.
595
 */
596

    
597
/**
598
 * Initializes the two-pass plugin and context.
599
 *
600
 * @param param Input construction parameter structure
601
 * @param handle Private context handle
602
 * @return Returns XVID_ERR_xxxx on failure, or 0 on success.
603
 */
604
static int xvid_ff_2pass_create(xvid_plg_create_t * param,
605
                                void ** handle) {
606
    xvid_ff_pass1_t *x = (xvid_ff_pass1_t *)param->param;
607
    char *log = x->context->twopassbuffer;
608

    
609
    /* Do a quick bounds check */
610
    if( log == NULL )
611
        return XVID_ERR_FAIL;
612

    
613
    /* We use snprintf() */
614
    /* This is because we can safely prevent a buffer overflow */
615
    log[0] = 0;
616
    snprintf(log, BUFFER_REMAINING(log),
617
        "# ffmpeg 2-pass log file, using xvid codec\n");
618
    snprintf(BUFFER_CAT(log), BUFFER_REMAINING(log),
619
        "# Do not modify. libxvidcore version: %d.%d.%d\n\n",
620
        XVID_VERSION_MAJOR(XVID_VERSION),
621
        XVID_VERSION_MINOR(XVID_VERSION),
622
        XVID_VERSION_PATCH(XVID_VERSION));
623

    
624
    *handle = x->context;
625
    return 0;
626
}
627

    
628
/**
629
 * Destroys the two-pass plugin context.
630
 *
631
 * @param ref Context pointer for the plugin
632
 * @param param Destrooy context
633
 * @return Returns 0, success guaranteed
634
 */
635
static int xvid_ff_2pass_destroy(xvid_context_t *ref,
636
                                xvid_plg_destroy_t *param) {
637
    /* Currently cannot think of anything to do on destruction */
638
    /* Still, the framework should be here for reference/use */
639
    if( ref->twopassbuffer != NULL )
640
        ref->twopassbuffer[0] = 0;
641
    return 0;
642
}
643

    
644
/**
645
 * Enables fast encode mode during the first pass.
646
 *
647
 * @param ref Context pointer for the plugin
648
 * @param param Frame data
649
 * @return Returns 0, success guaranteed
650
 */
651
static int xvid_ff_2pass_before(xvid_context_t *ref,
652
                                xvid_plg_data_t *param) {
653
    int motion_remove;
654
    int motion_replacements;
655
    int vop_remove;
656

    
657
    /* Nothing to do here, result is changed too much */
658
    if( param->zone && param->zone->mode == XVID_ZONE_QUANT )
659
        return 0;
660

    
661
    /* We can implement a 'turbo' first pass mode here */
662
    param->quant = 2;
663

    
664
    /* Init values */
665
    motion_remove = ~XVID_ME_CHROMA_PVOP &
666
                    ~XVID_ME_CHROMA_BVOP &
667
                    ~XVID_ME_EXTSEARCH16 &
668
                    ~XVID_ME_ADVANCEDDIAMOND16;
669
    motion_replacements = XVID_ME_FAST_MODEINTERPOLATE |
670
                          XVID_ME_SKIP_DELTASEARCH |
671
                          XVID_ME_FASTREFINE16 |
672
                          XVID_ME_BFRAME_EARLYSTOP;
673
    vop_remove = ~XVID_VOP_MODEDECISION_RD &
674
                 ~XVID_VOP_FAST_MODEDECISION_RD &
675
                 ~XVID_VOP_TRELLISQUANT &
676
                 ~XVID_VOP_INTER4V &
677
                 ~XVID_VOP_HQACPRED;
678

    
679
    param->vol_flags &= ~XVID_VOL_GMC;
680
    param->vop_flags &= vop_remove;
681
    param->motion_flags &= motion_remove;
682
    param->motion_flags |= motion_replacements;
683

    
684
    return 0;
685
}
686

    
687
/**
688
 * Captures statistic data and writes it during first pass.
689
 *
690
 * @param ref Context pointer for the plugin
691
 * @param param Statistic data
692
 * @return Returns XVID_ERR_xxxx on failure, or 0 on success
693
 */
694
static int xvid_ff_2pass_after(xvid_context_t *ref,
695
                                xvid_plg_data_t *param) {
696
    char *log = ref->twopassbuffer;
697
    char *frame_types = " ipbs";
698
    char frame_type;
699

    
700
    /* Quick bounds check */
701
    if( log == NULL )
702
        return XVID_ERR_FAIL;
703

    
704
    /* Convert the type given to us into a character */
705
    if( param->type < 5 && param->type > 0 ) {
706
        frame_type = frame_types[param->type];
707
    } else {
708
        return XVID_ERR_FAIL;
709
    }
710

    
711
    snprintf(BUFFER_CAT(log), BUFFER_REMAINING(log),
712
        "%c %d %d %d %d %d %d\n",
713
        frame_type, param->stats.quant, param->stats.kblks, param->stats.mblks,
714
        param->stats.ublks, param->stats.length, param->stats.hlength);
715

    
716
    return 0;
717
}
718

    
719
/**
720
 * Dispatch function for our custom plugin.
721
 * This handles the dispatch for the XviD plugin. It passes data
722
 * on to other functions for actual processing.
723
 *
724
 * @param ref Context pointer for the plugin
725
 * @param cmd The task given for us to complete
726
 * @param p1 First parameter (varies)
727
 * @param p2 Second parameter (varies)
728
 * @return Returns XVID_ERR_xxxx on failure, or 0 on success
729
 */
730
int xvid_ff_2pass(void *ref, int cmd, void *p1, void *p2) {
731
    switch( cmd ) {
732
        case XVID_PLG_INFO:
733
        case XVID_PLG_FRAME:
734
            return 0;
735

    
736
        case XVID_PLG_BEFORE:
737
            return xvid_ff_2pass_before(ref, p1);
738

    
739
        case XVID_PLG_CREATE:
740
            return xvid_ff_2pass_create(p1, p2);
741

    
742
        case XVID_PLG_AFTER:
743
            return xvid_ff_2pass_after(ref, p1);
744

    
745
        case XVID_PLG_DESTROY:
746
            return xvid_ff_2pass_destroy(ref, p1);
747

    
748
        default:
749
            return XVID_ERR_FAIL;
750
    }
751
}
752

    
753
/**
754
 * XviD codec definition for libavcodec.
755
 */
756
AVCodec xvid_encoder = {
757
    "xvid",
758
    CODEC_TYPE_VIDEO,
759
    CODEC_ID_XVID,
760
    sizeof(xvid_context_t),
761
    ff_xvid_encode_init,
762
    ff_xvid_encode_frame,
763
    ff_xvid_encode_close
764
};