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ffmpeg / libavcodec / libxvidff.c @ e31a7441

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1
/*
2
 * Interface to xvidcore for mpeg4 encoding
3
 * Copyright (c) 2004 Adam Thayer <krevnik@comcast.net>
4
 *
5
 * This file is part of FFmpeg.
6
 *
7
 * FFmpeg is free software; you can redistribute it and/or
8
 * modify it under the terms of the GNU Lesser General Public
9
 * License as published by the Free Software Foundation; either
10
 * version 2.1 of the License, or (at your option) any later version.
11
 *
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 * FFmpeg is distributed in the hope that it will be useful,
13
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15
 * 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 FFmpeg; 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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 */
21

    
22
/**
23
 * @file
24
 * Interface to xvidcore for MPEG-4 compliant encoding.
25
 * @author Adam Thayer (krevnik@comcast.net)
26
 */
27

    
28
/* needed for mkstemp() */
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#define _XOPEN_SOURCE 600
30

    
31
#include <xvid.h>
32
#include <unistd.h>
33
#include "avcodec.h"
34
#include "libavutil/cpu.h"
35
#include "libavutil/intreadwrite.h"
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#include "libxvid_internal.h"
37
#if !HAVE_MKSTEMP
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#include <fcntl.h>
39
#endif
40

    
41
/**
42
 * Buffer management macros.
43
 */
44
#define BUFFER_SIZE                 1024
45
#define BUFFER_REMAINING(x)         (BUFFER_SIZE - strlen(x))
46
#define BUFFER_CAT(x)               (&((x)[strlen(x)]))
47

    
48
/**
49
 * Structure for the private Xvid context.
50
 * This stores all the private context for the codec.
51
 */
52
struct xvid_context {
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    void *encoder_handle;          /**< Handle for Xvid encoder */
54
    int xsize;                     /**< Frame x size */
55
    int ysize;                     /**< Frame y size */
56
    int vop_flags;                 /**< VOP flags for Xvid encoder */
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    int vol_flags;                 /**< VOL flags for Xvid encoder */
58
    int me_flags;                  /**< Motion Estimation flags */
59
    int qscale;                    /**< Do we use constant scale? */
60
    int quicktime_format;          /**< Are we in a QT-based format? */
61
    AVFrame encoded_picture;       /**< Encoded frame information */
62
    char *twopassbuffer;           /**< Character buffer for two-pass */
63
    char *old_twopassbuffer;       /**< Old character buffer (two-pass) */
64
    char *twopassfile;             /**< second pass temp file name */
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    unsigned char *intra_matrix;   /**< P-Frame Quant Matrix */
66
    unsigned char *inter_matrix;   /**< I-Frame Quant Matrix */
67
};
68

    
69
/**
70
 * Structure for the private first-pass plugin.
71
 */
72
struct xvid_ff_pass1 {
73
    int     version;                /**< Xvid version */
74
    struct xvid_context *context;   /**< Pointer to private context */
75
};
76

    
77
/* Prototypes - See function implementation for details */
78
int xvid_strip_vol_header(AVCodecContext *avctx, unsigned char *frame, unsigned int header_len, unsigned int frame_len);
79
int xvid_ff_2pass(void *ref, int opt, void *p1, void *p2);
80
void xvid_correct_framerate(AVCodecContext *avctx);
81

    
82
/* Wrapper to work around the lack of mkstemp() on mingw.
83
 * Also, tries to create file in /tmp first, if possible.
84
 * *prefix can be a character constant; *filename will be allocated internally.
85
 * @return file descriptor of opened file (or -1 on error)
86
 * and opened file name in **filename. */
87
int ff_tempfile(const char *prefix, char **filename) {
88
    int fd=-1;
89
#if !HAVE_MKSTEMP
90
    *filename = tempnam(".", prefix);
91
#else
92
    size_t len = strlen(prefix) + 12; /* room for "/tmp/" and "XXXXXX\0" */
93
    *filename = av_malloc(len);
94
#endif
95
    /* -----common section-----*/
96
    if (*filename == NULL) {
97
        av_log(NULL, AV_LOG_ERROR, "ff_tempfile: Cannot allocate file name\n");
98
        return -1;
99
    }
100
#if !HAVE_MKSTEMP
101
    fd = open(*filename, O_RDWR | O_BINARY | O_CREAT, 0444);
102
#else
103
    snprintf(*filename, len, "/tmp/%sXXXXXX", prefix);
104
    fd = mkstemp(*filename);
105
    if (fd < 0) {
106
        snprintf(*filename, len, "./%sXXXXXX", prefix);
107
        fd = mkstemp(*filename);
108
    }
109
#endif
110
    /* -----common section-----*/
111
    if (fd < 0) {
112
        av_log(NULL, AV_LOG_ERROR, "ff_tempfile: Cannot open temporary file %s\n", *filename);
113
        return -1;
114
    }
115
    return fd; /* success */
116
}
117

    
118
#if CONFIG_LIBXVID_ENCODER
119

    
120
/**
121
 * Create the private context for the encoder.
122
 * All buffers are allocated, settings are loaded from the user,
123
 * and the encoder context created.
124
 *
125
 * @param avctx AVCodecContext pointer to context
126
 * @return Returns 0 on success, -1 on failure
127
 */
128
static av_cold int xvid_encode_init(AVCodecContext *avctx)  {
129
    int xerr, i;
130
    int xvid_flags = avctx->flags;
131
    struct xvid_context *x = avctx->priv_data;
132
    uint16_t *intra, *inter;
133
    int fd;
134

    
135
    xvid_plugin_single_t single;
136
    struct xvid_ff_pass1 rc2pass1;
137
    xvid_plugin_2pass2_t rc2pass2;
138
    xvid_gbl_init_t xvid_gbl_init;
139
    xvid_enc_create_t xvid_enc_create;
140
    xvid_enc_plugin_t plugins[7];
141

    
142
    /* Bring in VOP flags from ffmpeg command-line */
143
    x->vop_flags = XVID_VOP_HALFPEL; /* Bare minimum quality */
144
    if( xvid_flags & CODEC_FLAG_4MV )
145
        x->vop_flags |= XVID_VOP_INTER4V; /* Level 3 */
146
    if( avctx->trellis
147
        )
148
        x->vop_flags |= XVID_VOP_TRELLISQUANT; /* Level 5 */
149
    if( xvid_flags & CODEC_FLAG_AC_PRED )
150
        x->vop_flags |= XVID_VOP_HQACPRED; /* Level 6 */
151
    if( xvid_flags & CODEC_FLAG_GRAY )
152
        x->vop_flags |= XVID_VOP_GREYSCALE;
153

    
154
    /* Decide which ME quality setting to use */
155
    x->me_flags = 0;
156
    switch( avctx->me_method ) {
157
       case ME_FULL:   /* Quality 6 */
158
           x->me_flags |=  XVID_ME_EXTSEARCH16
159
                       |   XVID_ME_EXTSEARCH8;
160

    
161
       case ME_EPZS:   /* Quality 4 */
162
           x->me_flags |=  XVID_ME_ADVANCEDDIAMOND8
163
                       |   XVID_ME_HALFPELREFINE8
164
                       |   XVID_ME_CHROMA_PVOP
165
                       |   XVID_ME_CHROMA_BVOP;
166

    
167
       case ME_LOG:    /* Quality 2 */
168
       case ME_PHODS:
169
       case ME_X1:
170
           x->me_flags |=  XVID_ME_ADVANCEDDIAMOND16
171
                       |   XVID_ME_HALFPELREFINE16;
172

    
173
       case ME_ZERO:   /* Quality 0 */
174
       default:
175
           break;
176
    }
177

    
178
    /* Decide how we should decide blocks */
179
    switch( avctx->mb_decision ) {
180
       case 2:
181
           x->vop_flags |= XVID_VOP_MODEDECISION_RD;
182
           x->me_flags |=  XVID_ME_HALFPELREFINE8_RD
183
                       |   XVID_ME_QUARTERPELREFINE8_RD
184
                       |   XVID_ME_EXTSEARCH_RD
185
                       |   XVID_ME_CHECKPREDICTION_RD;
186
       case 1:
187
           if( !(x->vop_flags & XVID_VOP_MODEDECISION_RD) )
188
               x->vop_flags |= XVID_VOP_FAST_MODEDECISION_RD;
189
           x->me_flags |=  XVID_ME_HALFPELREFINE16_RD
190
                       |   XVID_ME_QUARTERPELREFINE16_RD;
191

    
192
       default:
193
           break;
194
    }
195

    
196
    /* Bring in VOL flags from ffmpeg command-line */
197
    x->vol_flags = 0;
198
    if( xvid_flags & CODEC_FLAG_GMC ) {
199
        x->vol_flags |= XVID_VOL_GMC;
200
        x->me_flags |= XVID_ME_GME_REFINE;
201
    }
202
    if( xvid_flags & CODEC_FLAG_QPEL ) {
203
        x->vol_flags |= XVID_VOL_QUARTERPEL;
204
        x->me_flags |= XVID_ME_QUARTERPELREFINE16;
205
        if( x->vop_flags & XVID_VOP_INTER4V )
206
            x->me_flags |= XVID_ME_QUARTERPELREFINE8;
207
    }
208

    
209
    memset(&xvid_gbl_init, 0, sizeof(xvid_gbl_init));
210
    xvid_gbl_init.version = XVID_VERSION;
211
    xvid_gbl_init.debug = 0;
212

    
213
#if ARCH_PPC
214
    /* Xvid's PPC support is borked, use libavcodec to detect */
215
#if HAVE_ALTIVEC
216
    if (av_get_cpu_flags() & AV_CPU_FLAG_ALTIVEC) {
217
        xvid_gbl_init.cpu_flags = XVID_CPU_FORCE | XVID_CPU_ALTIVEC;
218
    } else
219
#endif
220
        xvid_gbl_init.cpu_flags = XVID_CPU_FORCE;
221
#else
222
    /* Xvid can detect on x86 */
223
    xvid_gbl_init.cpu_flags = 0;
224
#endif
225

    
226
    /* Initialize */
227
    xvid_global(NULL, XVID_GBL_INIT, &xvid_gbl_init, NULL);
228

    
229
    /* Create the encoder reference */
230
    memset(&xvid_enc_create, 0, sizeof(xvid_enc_create));
231
    xvid_enc_create.version = XVID_VERSION;
232

    
233
    /* Store the desired frame size */
234
    xvid_enc_create.width = x->xsize = avctx->width;
235
    xvid_enc_create.height = x->ysize = avctx->height;
236

    
237
    /* Xvid can determine the proper profile to use */
238
    /* xvid_enc_create.profile = XVID_PROFILE_S_L3; */
239

    
240
    /* We don't use zones */
241
    xvid_enc_create.zones = NULL;
242
    xvid_enc_create.num_zones = 0;
243

    
244
    xvid_enc_create.num_threads = avctx->thread_count;
245

    
246
    xvid_enc_create.plugins = plugins;
247
    xvid_enc_create.num_plugins = 0;
248

    
249
    /* Initialize Buffers */
250
    x->twopassbuffer = NULL;
251
    x->old_twopassbuffer = NULL;
252
    x->twopassfile = NULL;
253

    
254
    if( xvid_flags & CODEC_FLAG_PASS1 ) {
255
        memset(&rc2pass1, 0, sizeof(struct xvid_ff_pass1));
256
        rc2pass1.version = XVID_VERSION;
257
        rc2pass1.context = x;
258
        x->twopassbuffer = av_malloc(BUFFER_SIZE);
259
        x->old_twopassbuffer = av_malloc(BUFFER_SIZE);
260
        if( x->twopassbuffer == NULL || x->old_twopassbuffer == NULL ) {
261
            av_log(avctx, AV_LOG_ERROR,
262
                "Xvid: Cannot allocate 2-pass log buffers\n");
263
            return -1;
264
        }
265
        x->twopassbuffer[0] = x->old_twopassbuffer[0] = 0;
266

    
267
        plugins[xvid_enc_create.num_plugins].func = xvid_ff_2pass;
268
        plugins[xvid_enc_create.num_plugins].param = &rc2pass1;
269
        xvid_enc_create.num_plugins++;
270
    } else if( xvid_flags & CODEC_FLAG_PASS2 ) {
271
        memset(&rc2pass2, 0, sizeof(xvid_plugin_2pass2_t));
272
        rc2pass2.version = XVID_VERSION;
273
        rc2pass2.bitrate = avctx->bit_rate;
274

    
275
        fd = ff_tempfile("xvidff.", &(x->twopassfile));
276
        if( fd == -1 ) {
277
            av_log(avctx, AV_LOG_ERROR,
278
                "Xvid: Cannot write 2-pass pipe\n");
279
            return -1;
280
        }
281

    
282
        if( avctx->stats_in == NULL ) {
283
            av_log(avctx, AV_LOG_ERROR,
284
                "Xvid: No 2-pass information loaded for second pass\n");
285
            return -1;
286
        }
287

    
288
        if( strlen(avctx->stats_in) >
289
              write(fd, avctx->stats_in, strlen(avctx->stats_in)) ) {
290
            close(fd);
291
            av_log(avctx, AV_LOG_ERROR,
292
                "Xvid: Cannot write to 2-pass pipe\n");
293
            return -1;
294
        }
295

    
296
        close(fd);
297
        rc2pass2.filename = x->twopassfile;
298
        plugins[xvid_enc_create.num_plugins].func = xvid_plugin_2pass2;
299
        plugins[xvid_enc_create.num_plugins].param = &rc2pass2;
300
        xvid_enc_create.num_plugins++;
301
    } else if( !(xvid_flags & CODEC_FLAG_QSCALE) ) {
302
        /* Single Pass Bitrate Control! */
303
        memset(&single, 0, sizeof(xvid_plugin_single_t));
304
        single.version = XVID_VERSION;
305
        single.bitrate = avctx->bit_rate;
306

    
307
        plugins[xvid_enc_create.num_plugins].func = xvid_plugin_single;
308
        plugins[xvid_enc_create.num_plugins].param = &single;
309
        xvid_enc_create.num_plugins++;
310
    }
311

    
312
    /* Luminance Masking */
313
    if( 0.0 != avctx->lumi_masking ) {
314
        plugins[xvid_enc_create.num_plugins].func = xvid_plugin_lumimasking;
315
        plugins[xvid_enc_create.num_plugins].param = NULL;
316
        xvid_enc_create.num_plugins++;
317
    }
318

    
319
    /* Frame Rate and Key Frames */
320
    xvid_correct_framerate(avctx);
321
    xvid_enc_create.fincr = avctx->time_base.num;
322
    xvid_enc_create.fbase = avctx->time_base.den;
323
    if( avctx->gop_size > 0 )
324
        xvid_enc_create.max_key_interval = avctx->gop_size;
325
    else
326
        xvid_enc_create.max_key_interval = 240; /* Xvid's best default */
327

    
328
    /* Quants */
329
    if( xvid_flags & CODEC_FLAG_QSCALE ) x->qscale = 1;
330
    else x->qscale = 0;
331

    
332
    xvid_enc_create.min_quant[0] = avctx->qmin;
333
    xvid_enc_create.min_quant[1] = avctx->qmin;
334
    xvid_enc_create.min_quant[2] = avctx->qmin;
335
    xvid_enc_create.max_quant[0] = avctx->qmax;
336
    xvid_enc_create.max_quant[1] = avctx->qmax;
337
    xvid_enc_create.max_quant[2] = avctx->qmax;
338

    
339
    /* Quant Matrices */
340
    x->intra_matrix = x->inter_matrix = NULL;
341
    if( avctx->mpeg_quant )
342
       x->vol_flags |= XVID_VOL_MPEGQUANT;
343
    if( (avctx->intra_matrix || avctx->inter_matrix) ) {
344
       x->vol_flags |= XVID_VOL_MPEGQUANT;
345

    
346
       if( avctx->intra_matrix ) {
347
           intra = avctx->intra_matrix;
348
           x->intra_matrix = av_malloc(sizeof(unsigned char) * 64);
349
       } else
350
           intra = NULL;
351
       if( avctx->inter_matrix ) {
352
           inter = avctx->inter_matrix;
353
           x->inter_matrix = av_malloc(sizeof(unsigned char) * 64);
354
       } else
355
           inter = NULL;
356

    
357
       for( i = 0; i < 64; i++ ) {
358
           if( intra )
359
               x->intra_matrix[i] = (unsigned char)intra[i];
360
           if( inter )
361
               x->inter_matrix[i] = (unsigned char)inter[i];
362
       }
363
    }
364

    
365
    /* Misc Settings */
366
    xvid_enc_create.frame_drop_ratio = 0;
367
    xvid_enc_create.global = 0;
368
    if( xvid_flags & CODEC_FLAG_CLOSED_GOP )
369
        xvid_enc_create.global |= XVID_GLOBAL_CLOSED_GOP;
370

    
371
    /* Determines which codec mode we are operating in */
372
    avctx->extradata = NULL;
373
    avctx->extradata_size = 0;
374
    if( xvid_flags & CODEC_FLAG_GLOBAL_HEADER ) {
375
        /* In this case, we are claiming to be MPEG4 */
376
        x->quicktime_format = 1;
377
        avctx->codec_id = CODEC_ID_MPEG4;
378
    } else {
379
        /* We are claiming to be Xvid */
380
        x->quicktime_format = 0;
381
        if(!avctx->codec_tag)
382
            avctx->codec_tag = AV_RL32("xvid");
383
    }
384

    
385
    /* Bframes */
386
    xvid_enc_create.max_bframes = avctx->max_b_frames;
387
    xvid_enc_create.bquant_offset = 100 * avctx->b_quant_offset;
388
    xvid_enc_create.bquant_ratio = 100 * avctx->b_quant_factor;
389
    if( avctx->max_b_frames > 0  && !x->quicktime_format ) xvid_enc_create.global |= XVID_GLOBAL_PACKED;
390

    
391
    /* Create encoder context */
392
    xerr = xvid_encore(NULL, XVID_ENC_CREATE, &xvid_enc_create, NULL);
393
    if( xerr ) {
394
        av_log(avctx, AV_LOG_ERROR, "Xvid: Could not create encoder reference\n");
395
        return -1;
396
    }
397

    
398
    x->encoder_handle = xvid_enc_create.handle;
399
    avctx->coded_frame = &x->encoded_picture;
400

    
401
    return 0;
402
}
403

    
404
/**
405
 * Encode a single frame.
406
 *
407
 * @param avctx AVCodecContext pointer to context
408
 * @param frame Pointer to encoded frame buffer
409
 * @param buf_size Size of encoded frame buffer
410
 * @param data Pointer to AVFrame of unencoded frame
411
 * @return Returns 0 on success, -1 on failure
412
 */
413
static int xvid_encode_frame(AVCodecContext *avctx,
414
                         unsigned char *frame, int buf_size, void *data) {
415
    int xerr, i;
416
    char *tmp;
417
    struct xvid_context *x = avctx->priv_data;
418
    AVFrame *picture = data;
419
    AVFrame *p = &(x->encoded_picture);
420

    
421
    xvid_enc_frame_t xvid_enc_frame;
422
    xvid_enc_stats_t xvid_enc_stats;
423

    
424
    /* Start setting up the frame */
425
    memset(&xvid_enc_frame, 0, sizeof(xvid_enc_frame));
426
    xvid_enc_frame.version = XVID_VERSION;
427
    memset(&xvid_enc_stats, 0, sizeof(xvid_enc_stats));
428
    xvid_enc_stats.version = XVID_VERSION;
429
    *p = *picture;
430

    
431
    /* Let Xvid know where to put the frame. */
432
    xvid_enc_frame.bitstream = frame;
433
    xvid_enc_frame.length = buf_size;
434

    
435
    /* Initialize input image fields */
436
    if( avctx->pix_fmt != PIX_FMT_YUV420P ) {
437
        av_log(avctx, AV_LOG_ERROR, "Xvid: Color spaces other than 420p not supported\n");
438
        return -1;
439
    }
440

    
441
    xvid_enc_frame.input.csp = XVID_CSP_PLANAR; /* YUV420P */
442

    
443
    for( i = 0; i < 4; i++ ) {
444
        xvid_enc_frame.input.plane[i] = picture->data[i];
445
        xvid_enc_frame.input.stride[i] = picture->linesize[i];
446
    }
447

    
448
    /* Encoder Flags */
449
    xvid_enc_frame.vop_flags = x->vop_flags;
450
    xvid_enc_frame.vol_flags = x->vol_flags;
451
    xvid_enc_frame.motion = x->me_flags;
452
    xvid_enc_frame.type =
453
        picture->pict_type == FF_I_TYPE ? XVID_TYPE_IVOP :
454
        picture->pict_type == FF_P_TYPE ? XVID_TYPE_PVOP :
455
        picture->pict_type == FF_B_TYPE ? XVID_TYPE_BVOP :
456
                                          XVID_TYPE_AUTO;
457

    
458
    /* Pixel aspect ratio setting */
459
    if (avctx->sample_aspect_ratio.num < 1 || avctx->sample_aspect_ratio.num > 255 ||
460
        avctx->sample_aspect_ratio.den < 1 || avctx->sample_aspect_ratio.den > 255) {
461
        av_log(avctx, AV_LOG_ERROR, "Invalid pixel aspect ratio %i/%i\n",
462
               avctx->sample_aspect_ratio.num, avctx->sample_aspect_ratio.den);
463
        return -1;
464
    }
465
    xvid_enc_frame.par = XVID_PAR_EXT;
466
    xvid_enc_frame.par_width  = avctx->sample_aspect_ratio.num;
467
    xvid_enc_frame.par_height = avctx->sample_aspect_ratio.den;
468

    
469
    /* Quant Setting */
470
    if( x->qscale ) xvid_enc_frame.quant = picture->quality / FF_QP2LAMBDA;
471
    else xvid_enc_frame.quant = 0;
472

    
473
    /* Matrices */
474
    xvid_enc_frame.quant_intra_matrix = x->intra_matrix;
475
    xvid_enc_frame.quant_inter_matrix = x->inter_matrix;
476

    
477
    /* Encode */
478
    xerr = xvid_encore(x->encoder_handle, XVID_ENC_ENCODE,
479
        &xvid_enc_frame, &xvid_enc_stats);
480

    
481
    /* Two-pass log buffer swapping */
482
    avctx->stats_out = NULL;
483
    if( x->twopassbuffer ) {
484
        tmp = x->old_twopassbuffer;
485
        x->old_twopassbuffer = x->twopassbuffer;
486
        x->twopassbuffer = tmp;
487
        x->twopassbuffer[0] = 0;
488
        if( x->old_twopassbuffer[0] != 0 ) {
489
            avctx->stats_out = x->old_twopassbuffer;
490
        }
491
    }
492

    
493
    if( 0 <= xerr ) {
494
        p->quality = xvid_enc_stats.quant * FF_QP2LAMBDA;
495
        if( xvid_enc_stats.type == XVID_TYPE_PVOP )
496
            p->pict_type = FF_P_TYPE;
497
        else if( xvid_enc_stats.type == XVID_TYPE_BVOP )
498
            p->pict_type = FF_B_TYPE;
499
        else if( xvid_enc_stats.type == XVID_TYPE_SVOP )
500
            p->pict_type = FF_S_TYPE;
501
        else
502
            p->pict_type = FF_I_TYPE;
503
        if( xvid_enc_frame.out_flags & XVID_KEYFRAME ) {
504
            p->key_frame = 1;
505
            if( x->quicktime_format )
506
                return xvid_strip_vol_header(avctx, frame,
507
                    xvid_enc_stats.hlength, xerr);
508
         } else
509
            p->key_frame = 0;
510

    
511
        return xerr;
512
    } else {
513
        av_log(avctx, AV_LOG_ERROR, "Xvid: Encoding Error Occurred: %i\n", xerr);
514
        return -1;
515
    }
516
}
517

    
518
/**
519
 * Destroy the private context for the encoder.
520
 * All buffers are freed, and the Xvid encoder context is destroyed.
521
 *
522
 * @param avctx AVCodecContext pointer to context
523
 * @return Returns 0, success guaranteed
524
 */
525
static av_cold int xvid_encode_close(AVCodecContext *avctx) {
526
    struct xvid_context *x = avctx->priv_data;
527

    
528
    xvid_encore(x->encoder_handle, XVID_ENC_DESTROY, NULL, NULL);
529

    
530
    if( avctx->extradata != NULL )
531
        av_freep(&avctx->extradata);
532
    if( x->twopassbuffer != NULL ) {
533
        av_free(x->twopassbuffer);
534
        av_free(x->old_twopassbuffer);
535
    }
536
    av_free(x->twopassfile);
537
    av_free(x->intra_matrix);
538
    av_free(x->inter_matrix);
539

    
540
    return 0;
541
}
542

    
543
/**
544
 * Routine to create a global VO/VOL header for MP4 container.
545
 * What we do here is extract the header from the Xvid bitstream
546
 * as it is encoded. We also strip the repeated headers from the
547
 * bitstream when a global header is requested for MPEG-4 ISO
548
 * compliance.
549
 *
550
 * @param avctx AVCodecContext pointer to context
551
 * @param frame Pointer to encoded frame data
552
 * @param header_len Length of header to search
553
 * @param frame_len Length of encoded frame data
554
 * @return Returns new length of frame data
555
 */
556
int xvid_strip_vol_header(AVCodecContext *avctx,
557
                  unsigned char *frame,
558
                  unsigned int header_len,
559
                  unsigned int frame_len) {
560
    int vo_len = 0, i;
561

    
562
    for( i = 0; i < header_len - 3; i++ ) {
563
        if( frame[i] == 0x00 &&
564
            frame[i+1] == 0x00 &&
565
            frame[i+2] == 0x01 &&
566
            frame[i+3] == 0xB6 ) {
567
            vo_len = i;
568
            break;
569
        }
570
    }
571

    
572
    if( vo_len > 0 ) {
573
        /* We need to store the header, so extract it */
574
        if( avctx->extradata == NULL ) {
575
            avctx->extradata = av_malloc(vo_len);
576
            memcpy(avctx->extradata, frame, vo_len);
577
            avctx->extradata_size = vo_len;
578
        }
579
        /* Less dangerous now, memmove properly copies the two
580
           chunks of overlapping data */
581
        memmove(frame, &(frame[vo_len]), frame_len - vo_len);
582
        return frame_len - vo_len;
583
    } else
584
        return frame_len;
585
}
586

    
587
/**
588
 * Routine to correct a possibly erroneous framerate being fed to us.
589
 * Xvid currently chokes on framerates where the ticks per frame is
590
 * extremely large. This function works to correct problems in this area
591
 * by estimating a new framerate and taking the simpler fraction of
592
 * the two presented.
593
 *
594
 * @param avctx Context that contains the framerate to correct.
595
 */
596
void xvid_correct_framerate(AVCodecContext *avctx) {
597
    int frate, fbase;
598
    int est_frate, est_fbase;
599
    int gcd;
600
    float est_fps, fps;
601

    
602
    frate = avctx->time_base.den;
603
    fbase = avctx->time_base.num;
604

    
605
    gcd = av_gcd(frate, fbase);
606
    if( gcd > 1 ) {
607
        frate /= gcd;
608
        fbase /= gcd;
609
    }
610

    
611
    if( frate <= 65000 && fbase <= 65000 ) {
612
        avctx->time_base.den = frate;
613
        avctx->time_base.num = fbase;
614
        return;
615
    }
616

    
617
    fps = (float)frate / (float)fbase;
618
    est_fps = roundf(fps * 1000.0) / 1000.0;
619

    
620
    est_frate = (int)est_fps;
621
    if( est_fps > (int)est_fps ) {
622
        est_frate = (est_frate + 1) * 1000;
623
        est_fbase = (int)roundf((float)est_frate / est_fps);
624
    } else
625
        est_fbase = 1;
626

    
627
    gcd = av_gcd(est_frate, est_fbase);
628
    if( gcd > 1 ) {
629
        est_frate /= gcd;
630
        est_fbase /= gcd;
631
    }
632

    
633
    if( fbase > est_fbase ) {
634
        avctx->time_base.den = est_frate;
635
        avctx->time_base.num = est_fbase;
636
        av_log(avctx, AV_LOG_DEBUG,
637
            "Xvid: framerate re-estimated: %.2f, %.3f%% correction\n",
638
            est_fps, (((est_fps - fps)/fps) * 100.0));
639
    } else {
640
        avctx->time_base.den = frate;
641
        avctx->time_base.num = fbase;
642
    }
643
}
644

    
645
/*
646
 * Xvid 2-Pass Kludge Section
647
 *
648
 * Xvid's default 2-pass doesn't allow us to create data as we need to, so
649
 * this section spends time replacing the first pass plugin so we can write
650
 * statistic information as libavcodec requests in. We have another kludge
651
 * that allows us to pass data to the second pass in Xvid without a custom
652
 * rate-control plugin.
653
 */
654

    
655
/**
656
 * Initialize the two-pass plugin and context.
657
 *
658
 * @param param Input construction parameter structure
659
 * @param handle Private context handle
660
 * @return Returns XVID_ERR_xxxx on failure, or 0 on success.
661
 */
662
static int xvid_ff_2pass_create(xvid_plg_create_t * param,
663
                                void ** handle) {
664
    struct xvid_ff_pass1 *x = (struct xvid_ff_pass1 *)param->param;
665
    char *log = x->context->twopassbuffer;
666

    
667
    /* Do a quick bounds check */
668
    if( log == NULL )
669
        return XVID_ERR_FAIL;
670

    
671
    /* We use snprintf() */
672
    /* This is because we can safely prevent a buffer overflow */
673
    log[0] = 0;
674
    snprintf(log, BUFFER_REMAINING(log),
675
        "# ffmpeg 2-pass log file, using xvid codec\n");
676
    snprintf(BUFFER_CAT(log), BUFFER_REMAINING(log),
677
        "# Do not modify. libxvidcore version: %d.%d.%d\n\n",
678
        XVID_VERSION_MAJOR(XVID_VERSION),
679
        XVID_VERSION_MINOR(XVID_VERSION),
680
        XVID_VERSION_PATCH(XVID_VERSION));
681

    
682
    *handle = x->context;
683
    return 0;
684
}
685

    
686
/**
687
 * Destroy the two-pass plugin context.
688
 *
689
 * @param ref Context pointer for the plugin
690
 * @param param Destrooy context
691
 * @return Returns 0, success guaranteed
692
 */
693
static int xvid_ff_2pass_destroy(struct xvid_context *ref,
694
                                xvid_plg_destroy_t *param) {
695
    /* Currently cannot think of anything to do on destruction */
696
    /* Still, the framework should be here for reference/use */
697
    if( ref->twopassbuffer != NULL )
698
        ref->twopassbuffer[0] = 0;
699
    return 0;
700
}
701

    
702
/**
703
 * Enable fast encode mode during the first pass.
704
 *
705
 * @param ref Context pointer for the plugin
706
 * @param param Frame data
707
 * @return Returns 0, success guaranteed
708
 */
709
static int xvid_ff_2pass_before(struct xvid_context *ref,
710
                                xvid_plg_data_t *param) {
711
    int motion_remove;
712
    int motion_replacements;
713
    int vop_remove;
714

    
715
    /* Nothing to do here, result is changed too much */
716
    if( param->zone && param->zone->mode == XVID_ZONE_QUANT )
717
        return 0;
718

    
719
    /* We can implement a 'turbo' first pass mode here */
720
    param->quant = 2;
721

    
722
    /* Init values */
723
    motion_remove = ~XVID_ME_CHROMA_PVOP &
724
                    ~XVID_ME_CHROMA_BVOP &
725
                    ~XVID_ME_EXTSEARCH16 &
726
                    ~XVID_ME_ADVANCEDDIAMOND16;
727
    motion_replacements = XVID_ME_FAST_MODEINTERPOLATE |
728
                          XVID_ME_SKIP_DELTASEARCH |
729
                          XVID_ME_FASTREFINE16 |
730
                          XVID_ME_BFRAME_EARLYSTOP;
731
    vop_remove = ~XVID_VOP_MODEDECISION_RD &
732
                 ~XVID_VOP_FAST_MODEDECISION_RD &
733
                 ~XVID_VOP_TRELLISQUANT &
734
                 ~XVID_VOP_INTER4V &
735
                 ~XVID_VOP_HQACPRED;
736

    
737
    param->vol_flags &= ~XVID_VOL_GMC;
738
    param->vop_flags &= vop_remove;
739
    param->motion_flags &= motion_remove;
740
    param->motion_flags |= motion_replacements;
741

    
742
    return 0;
743
}
744

    
745
/**
746
 * Capture statistic data and write it during first pass.
747
 *
748
 * @param ref Context pointer for the plugin
749
 * @param param Statistic data
750
 * @return Returns XVID_ERR_xxxx on failure, or 0 on success
751
 */
752
static int xvid_ff_2pass_after(struct xvid_context *ref,
753
                                xvid_plg_data_t *param) {
754
    char *log = ref->twopassbuffer;
755
    char *frame_types = " ipbs";
756
    char frame_type;
757

    
758
    /* Quick bounds check */
759
    if( log == NULL )
760
        return XVID_ERR_FAIL;
761

    
762
    /* Convert the type given to us into a character */
763
    if( param->type < 5 && param->type > 0 ) {
764
        frame_type = frame_types[param->type];
765
    } else {
766
        return XVID_ERR_FAIL;
767
    }
768

    
769
    snprintf(BUFFER_CAT(log), BUFFER_REMAINING(log),
770
        "%c %d %d %d %d %d %d\n",
771
        frame_type, param->stats.quant, param->stats.kblks, param->stats.mblks,
772
        param->stats.ublks, param->stats.length, param->stats.hlength);
773

    
774
    return 0;
775
}
776

    
777
/**
778
 * Dispatch function for our custom plugin.
779
 * This handles the dispatch for the Xvid plugin. It passes data
780
 * on to other functions for actual processing.
781
 *
782
 * @param ref Context pointer for the plugin
783
 * @param cmd The task given for us to complete
784
 * @param p1 First parameter (varies)
785
 * @param p2 Second parameter (varies)
786
 * @return Returns XVID_ERR_xxxx on failure, or 0 on success
787
 */
788
int xvid_ff_2pass(void *ref, int cmd, void *p1, void *p2) {
789
    switch( cmd ) {
790
        case XVID_PLG_INFO:
791
        case XVID_PLG_FRAME:
792
            return 0;
793

    
794
        case XVID_PLG_BEFORE:
795
            return xvid_ff_2pass_before(ref, p1);
796

    
797
        case XVID_PLG_CREATE:
798
            return xvid_ff_2pass_create(p1, p2);
799

    
800
        case XVID_PLG_AFTER:
801
            return xvid_ff_2pass_after(ref, p1);
802

    
803
        case XVID_PLG_DESTROY:
804
            return xvid_ff_2pass_destroy(ref, p1);
805

    
806
        default:
807
            return XVID_ERR_FAIL;
808
    }
809
}
810

    
811
/**
812
 * Xvid codec definition for libavcodec.
813
 */
814
AVCodec ff_libxvid_encoder = {
815
    "libxvid",
816
    AVMEDIA_TYPE_VIDEO,
817
    CODEC_ID_MPEG4,
818
    sizeof(struct xvid_context),
819
    xvid_encode_init,
820
    xvid_encode_frame,
821
    xvid_encode_close,
822
    .pix_fmts= (const enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_NONE},
823
    .long_name= NULL_IF_CONFIG_SMALL("libxvidcore MPEG-4 part 2"),
824
};
825

    
826
#endif /* CONFIG_LIBXVID_ENCODER */