FFmpeg
 All Data Structures Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
libxvid.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 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  *
12  * 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.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 /**
23  * @file
24  * Interface to xvidcore for MPEG-4 compliant encoding.
25  * @author Adam Thayer (krevnik@comcast.net)
26  */
27 
28 #include <xvid.h>
29 #include <unistd.h>
30 #include "avcodec.h"
31 #include "internal.h"
32 #include "libavutil/file.h"
33 #include "libavutil/cpu.h"
34 #include "libavutil/intreadwrite.h"
35 #include "libavutil/mathematics.h"
36 #include "libxvid.h"
37 #include "mpegvideo.h"
38 
39 /**
40  * Buffer management macros.
41  */
42 #define BUFFER_SIZE 1024
43 #define BUFFER_REMAINING(x) (BUFFER_SIZE - strlen(x))
44 #define BUFFER_CAT(x) (&((x)[strlen(x)]))
45 
46 /**
47  * Structure for the private Xvid context.
48  * This stores all the private context for the codec.
49  */
50 struct xvid_context {
51  void *encoder_handle; /**< Handle for Xvid encoder */
52  int xsize; /**< Frame x size */
53  int ysize; /**< Frame y size */
54  int vop_flags; /**< VOP flags for Xvid encoder */
55  int vol_flags; /**< VOL flags for Xvid encoder */
56  int me_flags; /**< Motion Estimation flags */
57  int qscale; /**< Do we use constant scale? */
58  int quicktime_format; /**< Are we in a QT-based format? */
59  AVFrame encoded_picture; /**< Encoded frame information */
60  char *twopassbuffer; /**< Character buffer for two-pass */
61  char *old_twopassbuffer; /**< Old character buffer (two-pass) */
62  char *twopassfile; /**< second pass temp file name */
63  unsigned char *intra_matrix; /**< P-Frame Quant Matrix */
64  unsigned char *inter_matrix; /**< I-Frame Quant Matrix */
65 };
66 
67 /**
68  * Structure for the private first-pass plugin.
69  */
70 struct xvid_ff_pass1 {
71  int version; /**< Xvid version */
72  struct xvid_context *context; /**< Pointer to private context */
73 };
74 
75 /*
76  * Xvid 2-Pass Kludge Section
77  *
78  * Xvid's default 2-pass doesn't allow us to create data as we need to, so
79  * this section spends time replacing the first pass plugin so we can write
80  * statistic information as libavcodec requests in. We have another kludge
81  * that allows us to pass data to the second pass in Xvid without a custom
82  * rate-control plugin.
83  */
84 
85 /**
86  * Initialize the two-pass plugin and context.
87  *
88  * @param param Input construction parameter structure
89  * @param handle Private context handle
90  * @return Returns XVID_ERR_xxxx on failure, or 0 on success.
91  */
92 static int xvid_ff_2pass_create(xvid_plg_create_t * param,
93  void ** handle) {
94  struct xvid_ff_pass1 *x = (struct xvid_ff_pass1 *)param->param;
95  char *log = x->context->twopassbuffer;
96 
97  /* Do a quick bounds check */
98  if( log == NULL )
99  return XVID_ERR_FAIL;
100 
101  /* We use snprintf() */
102  /* This is because we can safely prevent a buffer overflow */
103  log[0] = 0;
104  snprintf(log, BUFFER_REMAINING(log),
105  "# ffmpeg 2-pass log file, using xvid codec\n");
107  "# Do not modify. libxvidcore version: %d.%d.%d\n\n",
108  XVID_VERSION_MAJOR(XVID_VERSION),
109  XVID_VERSION_MINOR(XVID_VERSION),
110  XVID_VERSION_PATCH(XVID_VERSION));
111 
112  *handle = x->context;
113  return 0;
114 }
115 
116 /**
117  * Destroy the two-pass plugin context.
118  *
119  * @param ref Context pointer for the plugin
120  * @param param Destrooy context
121  * @return Returns 0, success guaranteed
122  */
123 static int xvid_ff_2pass_destroy(struct xvid_context *ref,
124  xvid_plg_destroy_t *param) {
125  /* Currently cannot think of anything to do on destruction */
126  /* Still, the framework should be here for reference/use */
127  if( ref->twopassbuffer != NULL )
128  ref->twopassbuffer[0] = 0;
129  return 0;
130 }
131 
132 /**
133  * Enable fast encode mode during the first pass.
134  *
135  * @param ref Context pointer for the plugin
136  * @param param Frame data
137  * @return Returns 0, success guaranteed
138  */
139 static int xvid_ff_2pass_before(struct xvid_context *ref,
140  xvid_plg_data_t *param) {
141  int motion_remove;
142  int motion_replacements;
143  int vop_remove;
144 
145  /* Nothing to do here, result is changed too much */
146  if( param->zone && param->zone->mode == XVID_ZONE_QUANT )
147  return 0;
148 
149  /* We can implement a 'turbo' first pass mode here */
150  param->quant = 2;
151 
152  /* Init values */
153  motion_remove = ~XVID_ME_CHROMA_PVOP &
154  ~XVID_ME_CHROMA_BVOP &
155  ~XVID_ME_EXTSEARCH16 &
156  ~XVID_ME_ADVANCEDDIAMOND16;
157  motion_replacements = XVID_ME_FAST_MODEINTERPOLATE |
158  XVID_ME_SKIP_DELTASEARCH |
159  XVID_ME_FASTREFINE16 |
160  XVID_ME_BFRAME_EARLYSTOP;
161  vop_remove = ~XVID_VOP_MODEDECISION_RD &
162  ~XVID_VOP_FAST_MODEDECISION_RD &
163  ~XVID_VOP_TRELLISQUANT &
164  ~XVID_VOP_INTER4V &
165  ~XVID_VOP_HQACPRED;
166 
167  param->vol_flags &= ~XVID_VOL_GMC;
168  param->vop_flags &= vop_remove;
169  param->motion_flags &= motion_remove;
170  param->motion_flags |= motion_replacements;
171 
172  return 0;
173 }
174 
175 /**
176  * Capture statistic data and write it during first pass.
177  *
178  * @param ref Context pointer for the plugin
179  * @param param Statistic data
180  * @return Returns XVID_ERR_xxxx on failure, or 0 on success
181  */
182 static int xvid_ff_2pass_after(struct xvid_context *ref,
183  xvid_plg_data_t *param) {
184  char *log = ref->twopassbuffer;
185  const char *frame_types = " ipbs";
186  char frame_type;
187 
188  /* Quick bounds check */
189  if( log == NULL )
190  return XVID_ERR_FAIL;
191 
192  /* Convert the type given to us into a character */
193  if( param->type < 5 && param->type > 0 ) {
194  frame_type = frame_types[param->type];
195  } else {
196  return XVID_ERR_FAIL;
197  }
198 
200  "%c %d %d %d %d %d %d\n",
201  frame_type, param->stats.quant, param->stats.kblks, param->stats.mblks,
202  param->stats.ublks, param->stats.length, param->stats.hlength);
203 
204  return 0;
205 }
206 
207 /**
208  * Dispatch function for our custom plugin.
209  * This handles the dispatch for the Xvid plugin. It passes data
210  * on to other functions for actual processing.
211  *
212  * @param ref Context pointer for the plugin
213  * @param cmd The task given for us to complete
214  * @param p1 First parameter (varies)
215  * @param p2 Second parameter (varies)
216  * @return Returns XVID_ERR_xxxx on failure, or 0 on success
217  */
218 static int xvid_ff_2pass(void *ref, int cmd, void *p1, void *p2)
219 {
220  switch( cmd ) {
221  case XVID_PLG_INFO:
222  case XVID_PLG_FRAME:
223  return 0;
224 
225  case XVID_PLG_BEFORE:
226  return xvid_ff_2pass_before(ref, p1);
227 
228  case XVID_PLG_CREATE:
229  return xvid_ff_2pass_create(p1, p2);
230 
231  case XVID_PLG_AFTER:
232  return xvid_ff_2pass_after(ref, p1);
233 
234  case XVID_PLG_DESTROY:
235  return xvid_ff_2pass_destroy(ref, p1);
236 
237  default:
238  return XVID_ERR_FAIL;
239  }
240 }
241 
242 /**
243  * Routine to create a global VO/VOL header for MP4 container.
244  * What we do here is extract the header from the Xvid bitstream
245  * as it is encoded. We also strip the repeated headers from the
246  * bitstream when a global header is requested for MPEG-4 ISO
247  * compliance.
248  *
249  * @param avctx AVCodecContext pointer to context
250  * @param frame Pointer to encoded frame data
251  * @param header_len Length of header to search
252  * @param frame_len Length of encoded frame data
253  * @return Returns new length of frame data
254  */
256  AVPacket *pkt,
257  unsigned int header_len,
258  unsigned int frame_len) {
259  int vo_len = 0, i;
260 
261  for( i = 0; i < header_len - 3; i++ ) {
262  if( pkt->data[i] == 0x00 &&
263  pkt->data[i+1] == 0x00 &&
264  pkt->data[i+2] == 0x01 &&
265  pkt->data[i+3] == 0xB6 ) {
266  vo_len = i;
267  break;
268  }
269  }
270 
271  if( vo_len > 0 ) {
272  /* We need to store the header, so extract it */
273  if( avctx->extradata == NULL ) {
274  avctx->extradata = av_malloc(vo_len);
275  memcpy(avctx->extradata, pkt->data, vo_len);
276  avctx->extradata_size = vo_len;
277  }
278  /* Less dangerous now, memmove properly copies the two
279  chunks of overlapping data */
280  memmove(pkt->data, &pkt->data[vo_len], frame_len - vo_len);
281  pkt->size = frame_len - vo_len;
282  }
283  return 0;
284 }
285 
286 /**
287  * Routine to correct a possibly erroneous framerate being fed to us.
288  * Xvid currently chokes on framerates where the ticks per frame is
289  * extremely large. This function works to correct problems in this area
290  * by estimating a new framerate and taking the simpler fraction of
291  * the two presented.
292  *
293  * @param avctx Context that contains the framerate to correct.
294  */
296 {
297  int frate, fbase;
298  int est_frate, est_fbase;
299  int gcd;
300  float est_fps, fps;
301 
302  frate = avctx->time_base.den;
303  fbase = avctx->time_base.num;
304 
305  gcd = av_gcd(frate, fbase);
306  if( gcd > 1 ) {
307  frate /= gcd;
308  fbase /= gcd;
309  }
310 
311  if( frate <= 65000 && fbase <= 65000 ) {
312  avctx->time_base.den = frate;
313  avctx->time_base.num = fbase;
314  return;
315  }
316 
317  fps = (float)frate / (float)fbase;
318  est_fps = roundf(fps * 1000.0) / 1000.0;
319 
320  est_frate = (int)est_fps;
321  if( est_fps > (int)est_fps ) {
322  est_frate = (est_frate + 1) * 1000;
323  est_fbase = (int)roundf((float)est_frate / est_fps);
324  } else
325  est_fbase = 1;
326 
327  gcd = av_gcd(est_frate, est_fbase);
328  if( gcd > 1 ) {
329  est_frate /= gcd;
330  est_fbase /= gcd;
331  }
332 
333  if( fbase > est_fbase ) {
334  avctx->time_base.den = est_frate;
335  avctx->time_base.num = est_fbase;
336  av_log(avctx, AV_LOG_DEBUG,
337  "Xvid: framerate re-estimated: %.2f, %.3f%% correction\n",
338  est_fps, (((est_fps - fps)/fps) * 100.0));
339  } else {
340  avctx->time_base.den = frate;
341  avctx->time_base.num = fbase;
342  }
343 }
344 
346  int xerr, i;
347  int xvid_flags = avctx->flags;
348  struct xvid_context *x = avctx->priv_data;
349  uint16_t *intra, *inter;
350  int fd;
351 
352  xvid_plugin_single_t single = { 0 };
353  struct xvid_ff_pass1 rc2pass1 = { 0 };
354  xvid_plugin_2pass2_t rc2pass2 = { 0 };
355  xvid_gbl_init_t xvid_gbl_init = { 0 };
356  xvid_enc_create_t xvid_enc_create = { 0 };
357  xvid_enc_plugin_t plugins[7];
358 
359  /* Bring in VOP flags from ffmpeg command-line */
360  x->vop_flags = XVID_VOP_HALFPEL; /* Bare minimum quality */
361  if( xvid_flags & CODEC_FLAG_4MV )
362  x->vop_flags |= XVID_VOP_INTER4V; /* Level 3 */
363  if( avctx->trellis
364  )
365  x->vop_flags |= XVID_VOP_TRELLISQUANT; /* Level 5 */
366  if( xvid_flags & CODEC_FLAG_AC_PRED )
367  x->vop_flags |= XVID_VOP_HQACPRED; /* Level 6 */
368  if( xvid_flags & CODEC_FLAG_GRAY )
369  x->vop_flags |= XVID_VOP_GREYSCALE;
370 
371  /* Decide which ME quality setting to use */
372  x->me_flags = 0;
373  switch( avctx->me_method ) {
374  case ME_FULL: /* Quality 6 */
375  x->me_flags |= XVID_ME_EXTSEARCH16
376  | XVID_ME_EXTSEARCH8;
377 
378  case ME_EPZS: /* Quality 4 */
379  x->me_flags |= XVID_ME_ADVANCEDDIAMOND8
380  | XVID_ME_HALFPELREFINE8
381  | XVID_ME_CHROMA_PVOP
382  | XVID_ME_CHROMA_BVOP;
383 
384  case ME_LOG: /* Quality 2 */
385  case ME_PHODS:
386  case ME_X1:
387  x->me_flags |= XVID_ME_ADVANCEDDIAMOND16
388  | XVID_ME_HALFPELREFINE16;
389 
390  case ME_ZERO: /* Quality 0 */
391  default:
392  break;
393  }
394 
395  /* Decide how we should decide blocks */
396  switch( avctx->mb_decision ) {
397  case 2:
398  x->vop_flags |= XVID_VOP_MODEDECISION_RD;
399  x->me_flags |= XVID_ME_HALFPELREFINE8_RD
400  | XVID_ME_QUARTERPELREFINE8_RD
401  | XVID_ME_EXTSEARCH_RD
402  | XVID_ME_CHECKPREDICTION_RD;
403  case 1:
404  if( !(x->vop_flags & XVID_VOP_MODEDECISION_RD) )
405  x->vop_flags |= XVID_VOP_FAST_MODEDECISION_RD;
406  x->me_flags |= XVID_ME_HALFPELREFINE16_RD
407  | XVID_ME_QUARTERPELREFINE16_RD;
408 
409  default:
410  break;
411  }
412 
413  /* Bring in VOL flags from ffmpeg command-line */
414  x->vol_flags = 0;
415  if( xvid_flags & CODEC_FLAG_GMC ) {
416  x->vol_flags |= XVID_VOL_GMC;
417  x->me_flags |= XVID_ME_GME_REFINE;
418  }
419  if( xvid_flags & CODEC_FLAG_QPEL ) {
420  x->vol_flags |= XVID_VOL_QUARTERPEL;
421  x->me_flags |= XVID_ME_QUARTERPELREFINE16;
422  if( x->vop_flags & XVID_VOP_INTER4V )
423  x->me_flags |= XVID_ME_QUARTERPELREFINE8;
424  }
425 
426  xvid_gbl_init.version = XVID_VERSION;
427  xvid_gbl_init.debug = 0;
428 
429 #if ARCH_PPC
430  /* Xvid's PPC support is borked, use libavcodec to detect */
431 #if HAVE_ALTIVEC
433  xvid_gbl_init.cpu_flags = XVID_CPU_FORCE | XVID_CPU_ALTIVEC;
434  } else
435 #endif
436  xvid_gbl_init.cpu_flags = XVID_CPU_FORCE;
437 #else
438  /* Xvid can detect on x86 */
439  xvid_gbl_init.cpu_flags = 0;
440 #endif
441 
442  /* Initialize */
443  xvid_global(NULL, XVID_GBL_INIT, &xvid_gbl_init, NULL);
444 
445  /* Create the encoder reference */
446  xvid_enc_create.version = XVID_VERSION;
447 
448  /* Store the desired frame size */
449  xvid_enc_create.width = x->xsize = avctx->width;
450  xvid_enc_create.height = x->ysize = avctx->height;
451 
452  /* Xvid can determine the proper profile to use */
453  /* xvid_enc_create.profile = XVID_PROFILE_S_L3; */
454 
455  /* We don't use zones */
456  xvid_enc_create.zones = NULL;
457  xvid_enc_create.num_zones = 0;
458 
459  xvid_enc_create.num_threads = avctx->thread_count;
460 
461  xvid_enc_create.plugins = plugins;
462  xvid_enc_create.num_plugins = 0;
463 
464  /* Initialize Buffers */
465  x->twopassbuffer = NULL;
466  x->old_twopassbuffer = NULL;
467  x->twopassfile = NULL;
468 
469  if( xvid_flags & CODEC_FLAG_PASS1 ) {
470  rc2pass1.version = XVID_VERSION;
471  rc2pass1.context = x;
474  if( x->twopassbuffer == NULL || x->old_twopassbuffer == NULL ) {
475  av_log(avctx, AV_LOG_ERROR,
476  "Xvid: Cannot allocate 2-pass log buffers\n");
477  return -1;
478  }
479  x->twopassbuffer[0] = x->old_twopassbuffer[0] = 0;
480 
481  plugins[xvid_enc_create.num_plugins].func = xvid_ff_2pass;
482  plugins[xvid_enc_create.num_plugins].param = &rc2pass1;
483  xvid_enc_create.num_plugins++;
484  } else if( xvid_flags & CODEC_FLAG_PASS2 ) {
485  rc2pass2.version = XVID_VERSION;
486  rc2pass2.bitrate = avctx->bit_rate;
487 
488  fd = av_tempfile("xvidff.", &x->twopassfile, 0, avctx);
489  if( fd == -1 ) {
490  av_log(avctx, AV_LOG_ERROR,
491  "Xvid: Cannot write 2-pass pipe\n");
492  return -1;
493  }
494 
495  if( avctx->stats_in == NULL ) {
496  av_log(avctx, AV_LOG_ERROR,
497  "Xvid: No 2-pass information loaded for second pass\n");
498  return -1;
499  }
500 
501  if( strlen(avctx->stats_in) >
502  write(fd, avctx->stats_in, strlen(avctx->stats_in)) ) {
503  close(fd);
504  av_log(avctx, AV_LOG_ERROR,
505  "Xvid: Cannot write to 2-pass pipe\n");
506  return -1;
507  }
508 
509  close(fd);
510  rc2pass2.filename = x->twopassfile;
511  plugins[xvid_enc_create.num_plugins].func = xvid_plugin_2pass2;
512  plugins[xvid_enc_create.num_plugins].param = &rc2pass2;
513  xvid_enc_create.num_plugins++;
514  } else if( !(xvid_flags & CODEC_FLAG_QSCALE) ) {
515  /* Single Pass Bitrate Control! */
516  single.version = XVID_VERSION;
517  single.bitrate = avctx->bit_rate;
518 
519  plugins[xvid_enc_create.num_plugins].func = xvid_plugin_single;
520  plugins[xvid_enc_create.num_plugins].param = &single;
521  xvid_enc_create.num_plugins++;
522  }
523 
524  /* Luminance Masking */
525  if( 0.0 != avctx->lumi_masking ) {
526  plugins[xvid_enc_create.num_plugins].func = xvid_plugin_lumimasking;
527  plugins[xvid_enc_create.num_plugins].param = NULL;
528  xvid_enc_create.num_plugins++;
529  }
530 
531  /* Frame Rate and Key Frames */
532  xvid_correct_framerate(avctx);
533  xvid_enc_create.fincr = avctx->time_base.num;
534  xvid_enc_create.fbase = avctx->time_base.den;
535  if( avctx->gop_size > 0 )
536  xvid_enc_create.max_key_interval = avctx->gop_size;
537  else
538  xvid_enc_create.max_key_interval = 240; /* Xvid's best default */
539 
540  /* Quants */
541  if( xvid_flags & CODEC_FLAG_QSCALE ) x->qscale = 1;
542  else x->qscale = 0;
543 
544  xvid_enc_create.min_quant[0] = avctx->qmin;
545  xvid_enc_create.min_quant[1] = avctx->qmin;
546  xvid_enc_create.min_quant[2] = avctx->qmin;
547  xvid_enc_create.max_quant[0] = avctx->qmax;
548  xvid_enc_create.max_quant[1] = avctx->qmax;
549  xvid_enc_create.max_quant[2] = avctx->qmax;
550 
551  /* Quant Matrices */
552  x->intra_matrix = x->inter_matrix = NULL;
553  if( avctx->mpeg_quant )
554  x->vol_flags |= XVID_VOL_MPEGQUANT;
555  if( (avctx->intra_matrix || avctx->inter_matrix) ) {
556  x->vol_flags |= XVID_VOL_MPEGQUANT;
557 
558  if( avctx->intra_matrix ) {
559  intra = avctx->intra_matrix;
560  x->intra_matrix = av_malloc(sizeof(unsigned char) * 64);
561  } else
562  intra = NULL;
563  if( avctx->inter_matrix ) {
564  inter = avctx->inter_matrix;
565  x->inter_matrix = av_malloc(sizeof(unsigned char) * 64);
566  } else
567  inter = NULL;
568 
569  for( i = 0; i < 64; i++ ) {
570  if( intra )
571  x->intra_matrix[i] = (unsigned char)intra[i];
572  if( inter )
573  x->inter_matrix[i] = (unsigned char)inter[i];
574  }
575  }
576 
577  /* Misc Settings */
578  xvid_enc_create.frame_drop_ratio = 0;
579  xvid_enc_create.global = 0;
580  if( xvid_flags & CODEC_FLAG_CLOSED_GOP )
581  xvid_enc_create.global |= XVID_GLOBAL_CLOSED_GOP;
582 
583  /* Determines which codec mode we are operating in */
584  avctx->extradata = NULL;
585  avctx->extradata_size = 0;
586  if( xvid_flags & CODEC_FLAG_GLOBAL_HEADER ) {
587  /* In this case, we are claiming to be MPEG4 */
588  x->quicktime_format = 1;
589  avctx->codec_id = AV_CODEC_ID_MPEG4;
590  } else {
591  /* We are claiming to be Xvid */
592  x->quicktime_format = 0;
593  if(!avctx->codec_tag)
594  avctx->codec_tag = AV_RL32("xvid");
595  }
596 
597  /* Bframes */
598  xvid_enc_create.max_bframes = avctx->max_b_frames;
599  xvid_enc_create.bquant_offset = 100 * avctx->b_quant_offset;
600  xvid_enc_create.bquant_ratio = 100 * avctx->b_quant_factor;
601  if( avctx->max_b_frames > 0 && !x->quicktime_format ) xvid_enc_create.global |= XVID_GLOBAL_PACKED;
602 
603  /* Create encoder context */
604  xerr = xvid_encore(NULL, XVID_ENC_CREATE, &xvid_enc_create, NULL);
605  if( xerr ) {
606  av_log(avctx, AV_LOG_ERROR, "Xvid: Could not create encoder reference\n");
607  return -1;
608  }
609 
610  x->encoder_handle = xvid_enc_create.handle;
611  avctx->coded_frame = &x->encoded_picture;
612 
613  return 0;
614 }
615 
617  const AVFrame *picture, int *got_packet)
618 {
619  int xerr, i, ret, user_packet = !!pkt->data;
620  char *tmp;
621  struct xvid_context *x = avctx->priv_data;
622  AVFrame *p = &x->encoded_picture;
623  int mb_width = (avctx->width + 15) / 16;
624  int mb_height = (avctx->height + 15) / 16;
625 
626  xvid_enc_frame_t xvid_enc_frame = { 0 };
627  xvid_enc_stats_t xvid_enc_stats = { 0 };
628 
629  if ((ret = ff_alloc_packet2(avctx, pkt, mb_width*mb_height*MAX_MB_BYTES + FF_MIN_BUFFER_SIZE)) < 0)
630  return ret;
631 
632  /* Start setting up the frame */
633  xvid_enc_frame.version = XVID_VERSION;
634  xvid_enc_stats.version = XVID_VERSION;
635  *p = *picture;
636 
637  /* Let Xvid know where to put the frame. */
638  xvid_enc_frame.bitstream = pkt->data;
639  xvid_enc_frame.length = pkt->size;
640 
641  /* Initialize input image fields */
642  if( avctx->pix_fmt != AV_PIX_FMT_YUV420P ) {
643  av_log(avctx, AV_LOG_ERROR, "Xvid: Color spaces other than 420p not supported\n");
644  return -1;
645  }
646 
647  xvid_enc_frame.input.csp = XVID_CSP_PLANAR; /* YUV420P */
648 
649  for( i = 0; i < 4; i++ ) {
650  xvid_enc_frame.input.plane[i] = picture->data[i];
651  xvid_enc_frame.input.stride[i] = picture->linesize[i];
652  }
653 
654  /* Encoder Flags */
655  xvid_enc_frame.vop_flags = x->vop_flags;
656  xvid_enc_frame.vol_flags = x->vol_flags;
657  xvid_enc_frame.motion = x->me_flags;
658  xvid_enc_frame.type =
659  picture->pict_type == AV_PICTURE_TYPE_I ? XVID_TYPE_IVOP :
660  picture->pict_type == AV_PICTURE_TYPE_P ? XVID_TYPE_PVOP :
661  picture->pict_type == AV_PICTURE_TYPE_B ? XVID_TYPE_BVOP :
662  XVID_TYPE_AUTO;
663 
664  /* Pixel aspect ratio setting */
665  if (avctx->sample_aspect_ratio.num < 0 || avctx->sample_aspect_ratio.num > 255 ||
666  avctx->sample_aspect_ratio.den < 0 || avctx->sample_aspect_ratio.den > 255) {
667  av_log(avctx, AV_LOG_ERROR, "Invalid pixel aspect ratio %i/%i\n",
669  return -1;
670  }
671  xvid_enc_frame.par = XVID_PAR_EXT;
672  xvid_enc_frame.par_width = avctx->sample_aspect_ratio.num;
673  xvid_enc_frame.par_height = avctx->sample_aspect_ratio.den;
674 
675  /* Quant Setting */
676  if( x->qscale ) xvid_enc_frame.quant = picture->quality / FF_QP2LAMBDA;
677  else xvid_enc_frame.quant = 0;
678 
679  /* Matrices */
680  xvid_enc_frame.quant_intra_matrix = x->intra_matrix;
681  xvid_enc_frame.quant_inter_matrix = x->inter_matrix;
682 
683  /* Encode */
684  xerr = xvid_encore(x->encoder_handle, XVID_ENC_ENCODE,
685  &xvid_enc_frame, &xvid_enc_stats);
686 
687  /* Two-pass log buffer swapping */
688  avctx->stats_out = NULL;
689  if( x->twopassbuffer ) {
690  tmp = x->old_twopassbuffer;
692  x->twopassbuffer = tmp;
693  x->twopassbuffer[0] = 0;
694  if( x->old_twopassbuffer[0] != 0 ) {
695  avctx->stats_out = x->old_twopassbuffer;
696  }
697  }
698 
699  if (xerr > 0) {
700  *got_packet = 1;
701 
702  p->quality = xvid_enc_stats.quant * FF_QP2LAMBDA;
703  if( xvid_enc_stats.type == XVID_TYPE_PVOP )
705  else if( xvid_enc_stats.type == XVID_TYPE_BVOP )
707  else if( xvid_enc_stats.type == XVID_TYPE_SVOP )
709  else
711  if( xvid_enc_frame.out_flags & XVID_KEYFRAME ) {
712  p->key_frame = 1;
713  pkt->flags |= AV_PKT_FLAG_KEY;
714  if( x->quicktime_format )
715  return xvid_strip_vol_header(avctx, pkt,
716  xvid_enc_stats.hlength, xerr);
717  } else
718  p->key_frame = 0;
719 
720  pkt->size = xerr;
721 
722  return 0;
723  } else {
724  if (!user_packet)
725  av_free_packet(pkt);
726  if (!xerr)
727  return 0;
728  av_log(avctx, AV_LOG_ERROR, "Xvid: Encoding Error Occurred: %i\n", xerr);
729  return -1;
730  }
731 }
732 
734  struct xvid_context *x = avctx->priv_data;
735 
736  xvid_encore(x->encoder_handle, XVID_ENC_DESTROY, NULL, NULL);
737 
738  av_freep(&avctx->extradata);
739  if( x->twopassbuffer != NULL ) {
742  avctx->stats_out = NULL;
743  }
744  av_free(x->twopassfile);
745  av_free(x->intra_matrix);
746  av_free(x->inter_matrix);
747 
748  return 0;
749 }
750 
752  .name = "libxvid",
753  .type = AVMEDIA_TYPE_VIDEO,
754  .id = AV_CODEC_ID_MPEG4,
755  .priv_data_size = sizeof(struct xvid_context),
756  .init = xvid_encode_init,
757  .encode2 = xvid_encode_frame,
758  .close = xvid_encode_close,
759  .pix_fmts = (const enum AVPixelFormat[]){ AV_PIX_FMT_YUV420P, AV_PIX_FMT_NONE },
760  .long_name = NULL_IF_CONFIG_SMALL("libxvidcore MPEG-4 part 2"),
761 };