libxvidff.c
Go to the documentation of this file.
1 /*
2  * Interface to xvidcore for mpeg4 encoding
3  * Copyright (c) 2004 Adam Thayer <krevnik@comcast.net>
4  *
5  * This file is part of Libav.
6  *
7  * Libav 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  *
12  * Libav 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.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with Libav; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
28 #include <xvid.h>
29 #include <unistd.h>
30 #include "avcodec.h"
31 #include "libavutil/cpu.h"
32 #include "libavutil/intreadwrite.h"
33 #include "libavutil/mathematics.h"
34 #include "libxvid_internal.h"
35 #if !HAVE_MKSTEMP
36 #include <fcntl.h>
37 #endif
38 
42 #define BUFFER_SIZE 1024
43 #define BUFFER_REMAINING(x) (BUFFER_SIZE - strlen(x))
44 #define BUFFER_CAT(x) (&((x)[strlen(x)]))
45 
50 struct xvid_context {
52  int xsize;
53  int ysize;
54  int vop_flags;
55  int vol_flags;
56  int me_flags;
57  int qscale;
60  char *twopassbuffer;
62  char *twopassfile;
63  unsigned char *intra_matrix;
64  unsigned char *inter_matrix;
65 };
66 
70 struct xvid_ff_pass1 {
71  int version;
73 };
74 
75 /* Prototypes - See function implementation for details */
76 int xvid_strip_vol_header(AVCodecContext *avctx, unsigned char *frame, unsigned int header_len, unsigned int frame_len);
77 int xvid_ff_2pass(void *ref, int opt, void *p1, void *p2);
79 
80 /* Wrapper to work around the lack of mkstemp() on mingw.
81  * Also, tries to create file in /tmp first, if possible.
82  * *prefix can be a character constant; *filename will be allocated internally.
83  * @return file descriptor of opened file (or -1 on error)
84  * and opened file name in **filename. */
85 int ff_tempfile(const char *prefix, char **filename) {
86  int fd=-1;
87 #if !HAVE_MKSTEMP
88  *filename = tempnam(".", prefix);
89 #else
90  size_t len = strlen(prefix) + 12; /* room for "/tmp/" and "XXXXXX\0" */
91  *filename = av_malloc(len);
92 #endif
93  /* -----common section-----*/
94  if (*filename == NULL) {
95  av_log(NULL, AV_LOG_ERROR, "ff_tempfile: Cannot allocate file name\n");
96  return -1;
97  }
98 #if !HAVE_MKSTEMP
99  fd = open(*filename, O_RDWR | O_BINARY | O_CREAT, 0444);
100 #else
101  snprintf(*filename, len, "/tmp/%sXXXXXX", prefix);
102  fd = mkstemp(*filename);
103  if (fd < 0) {
104  snprintf(*filename, len, "./%sXXXXXX", prefix);
105  fd = mkstemp(*filename);
106  }
107 #endif
108  /* -----common section-----*/
109  if (fd < 0) {
110  av_log(NULL, AV_LOG_ERROR, "ff_tempfile: Cannot open temporary file %s\n", *filename);
111  return -1;
112  }
113  return fd; /* success */
114 }
115 
116 #if CONFIG_LIBXVID_ENCODER
117 
126 static av_cold int xvid_encode_init(AVCodecContext *avctx) {
127  int xerr, i;
128  int xvid_flags = avctx->flags;
129  struct xvid_context *x = avctx->priv_data;
130  uint16_t *intra, *inter;
131  int fd;
132 
133  xvid_plugin_single_t single;
134  struct xvid_ff_pass1 rc2pass1;
135  xvid_plugin_2pass2_t rc2pass2;
136  xvid_gbl_init_t xvid_gbl_init;
137  xvid_enc_create_t xvid_enc_create;
138  xvid_enc_plugin_t plugins[7];
139 
140  /* Bring in VOP flags from avconv command-line */
141  x->vop_flags = XVID_VOP_HALFPEL; /* Bare minimum quality */
142  if( xvid_flags & CODEC_FLAG_4MV )
143  x->vop_flags |= XVID_VOP_INTER4V; /* Level 3 */
144  if( avctx->trellis
145  )
146  x->vop_flags |= XVID_VOP_TRELLISQUANT; /* Level 5 */
147  if( xvid_flags & CODEC_FLAG_AC_PRED )
148  x->vop_flags |= XVID_VOP_HQACPRED; /* Level 6 */
149  if( xvid_flags & CODEC_FLAG_GRAY )
150  x->vop_flags |= XVID_VOP_GREYSCALE;
151 
152  /* Decide which ME quality setting to use */
153  x->me_flags = 0;
154  switch( avctx->me_method ) {
155  case ME_FULL: /* Quality 6 */
156  x->me_flags |= XVID_ME_EXTSEARCH16
157  | XVID_ME_EXTSEARCH8;
158 
159  case ME_EPZS: /* Quality 4 */
160  x->me_flags |= XVID_ME_ADVANCEDDIAMOND8
161  | XVID_ME_HALFPELREFINE8
162  | XVID_ME_CHROMA_PVOP
163  | XVID_ME_CHROMA_BVOP;
164 
165  case ME_LOG: /* Quality 2 */
166  case ME_PHODS:
167  case ME_X1:
168  x->me_flags |= XVID_ME_ADVANCEDDIAMOND16
169  | XVID_ME_HALFPELREFINE16;
170 
171  case ME_ZERO: /* Quality 0 */
172  default:
173  break;
174  }
175 
176  /* Decide how we should decide blocks */
177  switch( avctx->mb_decision ) {
178  case 2:
179  x->vop_flags |= XVID_VOP_MODEDECISION_RD;
180  x->me_flags |= XVID_ME_HALFPELREFINE8_RD
181  | XVID_ME_QUARTERPELREFINE8_RD
182  | XVID_ME_EXTSEARCH_RD
183  | XVID_ME_CHECKPREDICTION_RD;
184  case 1:
185  if( !(x->vop_flags & XVID_VOP_MODEDECISION_RD) )
186  x->vop_flags |= XVID_VOP_FAST_MODEDECISION_RD;
187  x->me_flags |= XVID_ME_HALFPELREFINE16_RD
188  | XVID_ME_QUARTERPELREFINE16_RD;
189 
190  default:
191  break;
192  }
193 
194  /* Bring in VOL flags from avconv command-line */
195  x->vol_flags = 0;
196  if( xvid_flags & CODEC_FLAG_GMC ) {
197  x->vol_flags |= XVID_VOL_GMC;
198  x->me_flags |= XVID_ME_GME_REFINE;
199  }
200  if( xvid_flags & CODEC_FLAG_QPEL ) {
201  x->vol_flags |= XVID_VOL_QUARTERPEL;
202  x->me_flags |= XVID_ME_QUARTERPELREFINE16;
203  if( x->vop_flags & XVID_VOP_INTER4V )
204  x->me_flags |= XVID_ME_QUARTERPELREFINE8;
205  }
206 
207  memset(&xvid_gbl_init, 0, sizeof(xvid_gbl_init));
208  xvid_gbl_init.version = XVID_VERSION;
209  xvid_gbl_init.debug = 0;
210 
211 #if ARCH_PPC
212  /* Xvid's PPC support is borked, use libavcodec to detect */
213 #if HAVE_ALTIVEC
215  xvid_gbl_init.cpu_flags = XVID_CPU_FORCE | XVID_CPU_ALTIVEC;
216  } else
217 #endif
218  xvid_gbl_init.cpu_flags = XVID_CPU_FORCE;
219 #else
220  /* Xvid can detect on x86 */
221  xvid_gbl_init.cpu_flags = 0;
222 #endif
223 
224  /* Initialize */
225  xvid_global(NULL, XVID_GBL_INIT, &xvid_gbl_init, NULL);
226 
227  /* Create the encoder reference */
228  memset(&xvid_enc_create, 0, sizeof(xvid_enc_create));
229  xvid_enc_create.version = XVID_VERSION;
230 
231  /* Store the desired frame size */
232  xvid_enc_create.width = x->xsize = avctx->width;
233  xvid_enc_create.height = x->ysize = avctx->height;
234 
235  /* Xvid can determine the proper profile to use */
236  /* xvid_enc_create.profile = XVID_PROFILE_S_L3; */
237 
238  /* We don't use zones */
239  xvid_enc_create.zones = NULL;
240  xvid_enc_create.num_zones = 0;
241 
242  xvid_enc_create.num_threads = avctx->thread_count;
243 
244  xvid_enc_create.plugins = plugins;
245  xvid_enc_create.num_plugins = 0;
246 
247  /* Initialize Buffers */
248  x->twopassbuffer = NULL;
249  x->old_twopassbuffer = NULL;
250  x->twopassfile = NULL;
251 
252  if( xvid_flags & CODEC_FLAG_PASS1 ) {
253  memset(&rc2pass1, 0, sizeof(struct xvid_ff_pass1));
254  rc2pass1.version = XVID_VERSION;
255  rc2pass1.context = x;
258  if( x->twopassbuffer == NULL || x->old_twopassbuffer == NULL ) {
259  av_log(avctx, AV_LOG_ERROR,
260  "Xvid: Cannot allocate 2-pass log buffers\n");
261  return -1;
262  }
263  x->twopassbuffer[0] = x->old_twopassbuffer[0] = 0;
264 
265  plugins[xvid_enc_create.num_plugins].func = xvid_ff_2pass;
266  plugins[xvid_enc_create.num_plugins].param = &rc2pass1;
267  xvid_enc_create.num_plugins++;
268  } else if( xvid_flags & CODEC_FLAG_PASS2 ) {
269  memset(&rc2pass2, 0, sizeof(xvid_plugin_2pass2_t));
270  rc2pass2.version = XVID_VERSION;
271  rc2pass2.bitrate = avctx->bit_rate;
272 
273  fd = ff_tempfile("xvidff.", &x->twopassfile);
274  if( fd == -1 ) {
275  av_log(avctx, AV_LOG_ERROR,
276  "Xvid: Cannot write 2-pass pipe\n");
277  return -1;
278  }
279 
280  if( avctx->stats_in == NULL ) {
281  av_log(avctx, AV_LOG_ERROR,
282  "Xvid: No 2-pass information loaded for second pass\n");
283  return -1;
284  }
285 
286  if( strlen(avctx->stats_in) >
287  write(fd, avctx->stats_in, strlen(avctx->stats_in)) ) {
288  close(fd);
289  av_log(avctx, AV_LOG_ERROR,
290  "Xvid: Cannot write to 2-pass pipe\n");
291  return -1;
292  }
293 
294  close(fd);
295  rc2pass2.filename = x->twopassfile;
296  plugins[xvid_enc_create.num_plugins].func = xvid_plugin_2pass2;
297  plugins[xvid_enc_create.num_plugins].param = &rc2pass2;
298  xvid_enc_create.num_plugins++;
299  } else if( !(xvid_flags & CODEC_FLAG_QSCALE) ) {
300  /* Single Pass Bitrate Control! */
301  memset(&single, 0, sizeof(xvid_plugin_single_t));
302  single.version = XVID_VERSION;
303  single.bitrate = avctx->bit_rate;
304 
305  plugins[xvid_enc_create.num_plugins].func = xvid_plugin_single;
306  plugins[xvid_enc_create.num_plugins].param = &single;
307  xvid_enc_create.num_plugins++;
308  }
309 
310  /* Luminance Masking */
311  if( 0.0 != avctx->lumi_masking ) {
312  plugins[xvid_enc_create.num_plugins].func = xvid_plugin_lumimasking;
313  plugins[xvid_enc_create.num_plugins].param = NULL;
314  xvid_enc_create.num_plugins++;
315  }
316 
317  /* Frame Rate and Key Frames */
318  xvid_correct_framerate(avctx);
319  xvid_enc_create.fincr = avctx->time_base.num;
320  xvid_enc_create.fbase = avctx->time_base.den;
321  if( avctx->gop_size > 0 )
322  xvid_enc_create.max_key_interval = avctx->gop_size;
323  else
324  xvid_enc_create.max_key_interval = 240; /* Xvid's best default */
325 
326  /* Quants */
327  if( xvid_flags & CODEC_FLAG_QSCALE ) x->qscale = 1;
328  else x->qscale = 0;
329 
330  xvid_enc_create.min_quant[0] = avctx->qmin;
331  xvid_enc_create.min_quant[1] = avctx->qmin;
332  xvid_enc_create.min_quant[2] = avctx->qmin;
333  xvid_enc_create.max_quant[0] = avctx->qmax;
334  xvid_enc_create.max_quant[1] = avctx->qmax;
335  xvid_enc_create.max_quant[2] = avctx->qmax;
336 
337  /* Quant Matrices */
338  x->intra_matrix = x->inter_matrix = NULL;
339  if( avctx->mpeg_quant )
340  x->vol_flags |= XVID_VOL_MPEGQUANT;
341  if( (avctx->intra_matrix || avctx->inter_matrix) ) {
342  x->vol_flags |= XVID_VOL_MPEGQUANT;
343 
344  if( avctx->intra_matrix ) {
345  intra = avctx->intra_matrix;
346  x->intra_matrix = av_malloc(sizeof(unsigned char) * 64);
347  } else
348  intra = NULL;
349  if( avctx->inter_matrix ) {
350  inter = avctx->inter_matrix;
351  x->inter_matrix = av_malloc(sizeof(unsigned char) * 64);
352  } else
353  inter = NULL;
354 
355  for( i = 0; i < 64; i++ ) {
356  if( intra )
357  x->intra_matrix[i] = (unsigned char)intra[i];
358  if( inter )
359  x->inter_matrix[i] = (unsigned char)inter[i];
360  }
361  }
362 
363  /* Misc Settings */
364  xvid_enc_create.frame_drop_ratio = 0;
365  xvid_enc_create.global = 0;
366  if( xvid_flags & CODEC_FLAG_CLOSED_GOP )
367  xvid_enc_create.global |= XVID_GLOBAL_CLOSED_GOP;
368 
369  /* Determines which codec mode we are operating in */
370  avctx->extradata = NULL;
371  avctx->extradata_size = 0;
372  if( xvid_flags & CODEC_FLAG_GLOBAL_HEADER ) {
373  /* In this case, we are claiming to be MPEG4 */
374  x->quicktime_format = 1;
375  avctx->codec_id = CODEC_ID_MPEG4;
376  } else {
377  /* We are claiming to be Xvid */
378  x->quicktime_format = 0;
379  if(!avctx->codec_tag)
380  avctx->codec_tag = AV_RL32("xvid");
381  }
382 
383  /* Bframes */
384  xvid_enc_create.max_bframes = avctx->max_b_frames;
385  xvid_enc_create.bquant_offset = 100 * avctx->b_quant_offset;
386  xvid_enc_create.bquant_ratio = 100 * avctx->b_quant_factor;
387  if( avctx->max_b_frames > 0 && !x->quicktime_format ) xvid_enc_create.global |= XVID_GLOBAL_PACKED;
388 
389  /* Create encoder context */
390  xerr = xvid_encore(NULL, XVID_ENC_CREATE, &xvid_enc_create, NULL);
391  if( xerr ) {
392  av_log(avctx, AV_LOG_ERROR, "Xvid: Could not create encoder reference\n");
393  return -1;
394  }
395 
396  x->encoder_handle = xvid_enc_create.handle;
397  avctx->coded_frame = &x->encoded_picture;
398 
399  return 0;
400 }
401 
411 static int xvid_encode_frame(AVCodecContext *avctx,
412  unsigned char *frame, int buf_size, void *data) {
413  int xerr, i;
414  char *tmp;
415  struct xvid_context *x = avctx->priv_data;
416  AVFrame *picture = data;
417  AVFrame *p = &x->encoded_picture;
418 
419  xvid_enc_frame_t xvid_enc_frame;
420  xvid_enc_stats_t xvid_enc_stats;
421 
422  /* Start setting up the frame */
423  memset(&xvid_enc_frame, 0, sizeof(xvid_enc_frame));
424  xvid_enc_frame.version = XVID_VERSION;
425  memset(&xvid_enc_stats, 0, sizeof(xvid_enc_stats));
426  xvid_enc_stats.version = XVID_VERSION;
427  *p = *picture;
428 
429  /* Let Xvid know where to put the frame. */
430  xvid_enc_frame.bitstream = frame;
431  xvid_enc_frame.length = buf_size;
432 
433  /* Initialize input image fields */
434  if( avctx->pix_fmt != PIX_FMT_YUV420P ) {
435  av_log(avctx, AV_LOG_ERROR, "Xvid: Color spaces other than 420p not supported\n");
436  return -1;
437  }
438 
439  xvid_enc_frame.input.csp = XVID_CSP_PLANAR; /* YUV420P */
440 
441  for( i = 0; i < 4; i++ ) {
442  xvid_enc_frame.input.plane[i] = picture->data[i];
443  xvid_enc_frame.input.stride[i] = picture->linesize[i];
444  }
445 
446  /* Encoder Flags */
447  xvid_enc_frame.vop_flags = x->vop_flags;
448  xvid_enc_frame.vol_flags = x->vol_flags;
449  xvid_enc_frame.motion = x->me_flags;
450  xvid_enc_frame.type =
451  picture->pict_type == AV_PICTURE_TYPE_I ? XVID_TYPE_IVOP :
452  picture->pict_type == AV_PICTURE_TYPE_P ? XVID_TYPE_PVOP :
453  picture->pict_type == AV_PICTURE_TYPE_B ? XVID_TYPE_BVOP :
454  XVID_TYPE_AUTO;
455 
456  /* Pixel aspect ratio setting */
457  if (avctx->sample_aspect_ratio.num < 1 || avctx->sample_aspect_ratio.num > 255 ||
458  avctx->sample_aspect_ratio.den < 1 || avctx->sample_aspect_ratio.den > 255) {
459  av_log(avctx, AV_LOG_ERROR, "Invalid pixel aspect ratio %i/%i\n",
461  return -1;
462  }
463  xvid_enc_frame.par = XVID_PAR_EXT;
464  xvid_enc_frame.par_width = avctx->sample_aspect_ratio.num;
465  xvid_enc_frame.par_height = avctx->sample_aspect_ratio.den;
466 
467  /* Quant Setting */
468  if( x->qscale ) xvid_enc_frame.quant = picture->quality / FF_QP2LAMBDA;
469  else xvid_enc_frame.quant = 0;
470 
471  /* Matrices */
472  xvid_enc_frame.quant_intra_matrix = x->intra_matrix;
473  xvid_enc_frame.quant_inter_matrix = x->inter_matrix;
474 
475  /* Encode */
476  xerr = xvid_encore(x->encoder_handle, XVID_ENC_ENCODE,
477  &xvid_enc_frame, &xvid_enc_stats);
478 
479  /* Two-pass log buffer swapping */
480  avctx->stats_out = NULL;
481  if( x->twopassbuffer ) {
482  tmp = x->old_twopassbuffer;
484  x->twopassbuffer = tmp;
485  x->twopassbuffer[0] = 0;
486  if( x->old_twopassbuffer[0] != 0 ) {
487  avctx->stats_out = x->old_twopassbuffer;
488  }
489  }
490 
491  if( 0 <= xerr ) {
492  p->quality = xvid_enc_stats.quant * FF_QP2LAMBDA;
493  if( xvid_enc_stats.type == XVID_TYPE_PVOP )
495  else if( xvid_enc_stats.type == XVID_TYPE_BVOP )
497  else if( xvid_enc_stats.type == XVID_TYPE_SVOP )
499  else
501  if( xvid_enc_frame.out_flags & XVID_KEYFRAME ) {
502  p->key_frame = 1;
503  if( x->quicktime_format )
504  return xvid_strip_vol_header(avctx, frame,
505  xvid_enc_stats.hlength, xerr);
506  } else
507  p->key_frame = 0;
508 
509  return xerr;
510  } else {
511  av_log(avctx, AV_LOG_ERROR, "Xvid: Encoding Error Occurred: %i\n", xerr);
512  return -1;
513  }
514 }
515 
523 static av_cold int xvid_encode_close(AVCodecContext *avctx) {
524  struct xvid_context *x = avctx->priv_data;
525 
526  xvid_encore(x->encoder_handle, XVID_ENC_DESTROY, NULL, NULL);
527 
528  av_freep(&avctx->extradata);
529  if( x->twopassbuffer != NULL ) {
532  }
533  av_free(x->twopassfile);
534  av_free(x->intra_matrix);
535  av_free(x->inter_matrix);
536 
537  return 0;
538 }
539 
554  unsigned char *frame,
555  unsigned int header_len,
556  unsigned int frame_len) {
557  int vo_len = 0, i;
558 
559  for( i = 0; i < header_len - 3; i++ ) {
560  if( frame[i] == 0x00 &&
561  frame[i+1] == 0x00 &&
562  frame[i+2] == 0x01 &&
563  frame[i+3] == 0xB6 ) {
564  vo_len = i;
565  break;
566  }
567  }
568 
569  if( vo_len > 0 ) {
570  /* We need to store the header, so extract it */
571  if( avctx->extradata == NULL ) {
572  avctx->extradata = av_malloc(vo_len);
573  memcpy(avctx->extradata, frame, vo_len);
574  avctx->extradata_size = vo_len;
575  }
576  /* Less dangerous now, memmove properly copies the two
577  chunks of overlapping data */
578  memmove(frame, &frame[vo_len], frame_len - vo_len);
579  return frame_len - vo_len;
580  } else
581  return frame_len;
582 }
583 
594  int frate, fbase;
595  int est_frate, est_fbase;
596  int gcd;
597  float est_fps, fps;
598 
599  frate = avctx->time_base.den;
600  fbase = avctx->time_base.num;
601 
602  gcd = av_gcd(frate, fbase);
603  if( gcd > 1 ) {
604  frate /= gcd;
605  fbase /= gcd;
606  }
607 
608  if( frate <= 65000 && fbase <= 65000 ) {
609  avctx->time_base.den = frate;
610  avctx->time_base.num = fbase;
611  return;
612  }
613 
614  fps = (float)frate / (float)fbase;
615  est_fps = roundf(fps * 1000.0) / 1000.0;
616 
617  est_frate = (int)est_fps;
618  if( est_fps > (int)est_fps ) {
619  est_frate = (est_frate + 1) * 1000;
620  est_fbase = (int)roundf((float)est_frate / est_fps);
621  } else
622  est_fbase = 1;
623 
624  gcd = av_gcd(est_frate, est_fbase);
625  if( gcd > 1 ) {
626  est_frate /= gcd;
627  est_fbase /= gcd;
628  }
629 
630  if( fbase > est_fbase ) {
631  avctx->time_base.den = est_frate;
632  avctx->time_base.num = est_fbase;
633  av_log(avctx, AV_LOG_DEBUG,
634  "Xvid: framerate re-estimated: %.2f, %.3f%% correction\n",
635  est_fps, (((est_fps - fps)/fps) * 100.0));
636  } else {
637  avctx->time_base.den = frate;
638  avctx->time_base.num = fbase;
639  }
640 }
641 
642 /*
643  * Xvid 2-Pass Kludge Section
644  *
645  * Xvid's default 2-pass doesn't allow us to create data as we need to, so
646  * this section spends time replacing the first pass plugin so we can write
647  * statistic information as libavcodec requests in. We have another kludge
648  * that allows us to pass data to the second pass in Xvid without a custom
649  * rate-control plugin.
650  */
651 
659 static int xvid_ff_2pass_create(xvid_plg_create_t * param,
660  void ** handle) {
661  struct xvid_ff_pass1 *x = (struct xvid_ff_pass1 *)param->param;
662  char *log = x->context->twopassbuffer;
663 
664  /* Do a quick bounds check */
665  if( log == NULL )
666  return XVID_ERR_FAIL;
667 
668  /* We use snprintf() */
669  /* This is because we can safely prevent a buffer overflow */
670  log[0] = 0;
671  snprintf(log, BUFFER_REMAINING(log),
672  "# avconv 2-pass log file, using xvid codec\n");
673  snprintf(BUFFER_CAT(log), BUFFER_REMAINING(log),
674  "# Do not modify. libxvidcore version: %d.%d.%d\n\n",
675  XVID_VERSION_MAJOR(XVID_VERSION),
676  XVID_VERSION_MINOR(XVID_VERSION),
677  XVID_VERSION_PATCH(XVID_VERSION));
678 
679  *handle = x->context;
680  return 0;
681 }
682 
690 static int xvid_ff_2pass_destroy(struct xvid_context *ref,
691  xvid_plg_destroy_t *param) {
692  /* Currently cannot think of anything to do on destruction */
693  /* Still, the framework should be here for reference/use */
694  if( ref->twopassbuffer != NULL )
695  ref->twopassbuffer[0] = 0;
696  return 0;
697 }
698 
706 static int xvid_ff_2pass_before(struct xvid_context *ref,
707  xvid_plg_data_t *param) {
708  int motion_remove;
709  int motion_replacements;
710  int vop_remove;
711 
712  /* Nothing to do here, result is changed too much */
713  if( param->zone && param->zone->mode == XVID_ZONE_QUANT )
714  return 0;
715 
716  /* We can implement a 'turbo' first pass mode here */
717  param->quant = 2;
718 
719  /* Init values */
720  motion_remove = ~XVID_ME_CHROMA_PVOP &
721  ~XVID_ME_CHROMA_BVOP &
722  ~XVID_ME_EXTSEARCH16 &
723  ~XVID_ME_ADVANCEDDIAMOND16;
724  motion_replacements = XVID_ME_FAST_MODEINTERPOLATE |
725  XVID_ME_SKIP_DELTASEARCH |
726  XVID_ME_FASTREFINE16 |
727  XVID_ME_BFRAME_EARLYSTOP;
728  vop_remove = ~XVID_VOP_MODEDECISION_RD &
729  ~XVID_VOP_FAST_MODEDECISION_RD &
730  ~XVID_VOP_TRELLISQUANT &
731  ~XVID_VOP_INTER4V &
732  ~XVID_VOP_HQACPRED;
733 
734  param->vol_flags &= ~XVID_VOL_GMC;
735  param->vop_flags &= vop_remove;
736  param->motion_flags &= motion_remove;
737  param->motion_flags |= motion_replacements;
738 
739  return 0;
740 }
741 
749 static int xvid_ff_2pass_after(struct xvid_context *ref,
750  xvid_plg_data_t *param) {
751  char *log = ref->twopassbuffer;
752  const char *frame_types = " ipbs";
753  char frame_type;
754 
755  /* Quick bounds check */
756  if( log == NULL )
757  return XVID_ERR_FAIL;
758 
759  /* Convert the type given to us into a character */
760  if( param->type < 5 && param->type > 0 ) {
761  frame_type = frame_types[param->type];
762  } else {
763  return XVID_ERR_FAIL;
764  }
765 
766  snprintf(BUFFER_CAT(log), BUFFER_REMAINING(log),
767  "%c %d %d %d %d %d %d\n",
768  frame_type, param->stats.quant, param->stats.kblks, param->stats.mblks,
769  param->stats.ublks, param->stats.length, param->stats.hlength);
770 
771  return 0;
772 }
773 
785 int xvid_ff_2pass(void *ref, int cmd, void *p1, void *p2) {
786  switch( cmd ) {
787  case XVID_PLG_INFO:
788  case XVID_PLG_FRAME:
789  return 0;
790 
791  case XVID_PLG_BEFORE:
792  return xvid_ff_2pass_before(ref, p1);
793 
794  case XVID_PLG_CREATE:
795  return xvid_ff_2pass_create(p1, p2);
796 
797  case XVID_PLG_AFTER:
798  return xvid_ff_2pass_after(ref, p1);
799 
800  case XVID_PLG_DESTROY:
801  return xvid_ff_2pass_destroy(ref, p1);
802 
803  default:
804  return XVID_ERR_FAIL;
805  }
806 }
807 
811 AVCodec ff_libxvid_encoder = {
812  .name = "libxvid",
813  .type = AVMEDIA_TYPE_VIDEO,
814  .id = CODEC_ID_MPEG4,
815  .priv_data_size = sizeof(struct xvid_context),
816  .init = xvid_encode_init,
817  .encode = xvid_encode_frame,
818  .close = xvid_encode_close,
819  .pix_fmts= (const enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_NONE},
820  .long_name= NULL_IF_CONFIG_SMALL("libxvidcore MPEG-4 part 2"),
821 };
822 
823 #endif /* CONFIG_LIBXVID_ENCODER */