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libxvid.c
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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  *
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 
30 #include "libavutil/cpu.h"
31 #include "libavutil/file.h"
32 #include "libavutil/intreadwrite.h"
33 #include "libavutil/mathematics.h"
34 
35 #include "avcodec.h"
36 #include "internal.h"
37 #include "libxvid.h"
38 #include "mpegvideo.h"
39 
40 #if HAVE_UNISTD_H
41 #include <unistd.h>
42 #endif
43 
44 #if HAVE_IO_H
45 #include <io.h>
46 #endif
47 
48 /**
49  * Buffer management macros.
50  */
51 #define BUFFER_SIZE 1024
52 #define BUFFER_REMAINING(x) (BUFFER_SIZE - strlen(x))
53 #define BUFFER_CAT(x) (&((x)[strlen(x)]))
54 
55 /**
56  * Structure for the private Xvid context.
57  * This stores all the private context for the codec.
58  */
59 struct xvid_context {
60  AVClass *class;
61  void *encoder_handle; /**< Handle for Xvid encoder */
62  int xsize; /**< Frame x size */
63  int ysize; /**< Frame y size */
64  int vop_flags; /**< VOP flags for Xvid encoder */
65  int vol_flags; /**< VOL flags for Xvid encoder */
66  int me_flags; /**< Motion Estimation flags */
67  int qscale; /**< Do we use constant scale? */
68  int quicktime_format; /**< Are we in a QT-based format? */
69  char *twopassbuffer; /**< Character buffer for two-pass */
70  char *old_twopassbuffer; /**< Old character buffer (two-pass) */
71  char *twopassfile; /**< second pass temp file name */
72  int twopassfd;
73  unsigned char *intra_matrix; /**< P-Frame Quant Matrix */
74  unsigned char *inter_matrix; /**< I-Frame Quant Matrix */
75  int lumi_aq; /**< Lumi masking as an aq method */
76  int variance_aq; /**< Variance adaptive quantization */
77  int ssim; /**< SSIM information display mode */
78  int ssim_acc; /**< SSIM accuracy. 0: accurate. 4: fast. */
79  int gmc;
80 };
81 
82 /**
83  * Structure for the private first-pass plugin.
84  */
85 struct xvid_ff_pass1 {
86  int version; /**< Xvid version */
87  struct xvid_context *context; /**< Pointer to private context */
88 };
89 
90 static int xvid_encode_close(AVCodecContext *avctx);
91 
92 /*
93  * Xvid 2-Pass Kludge Section
94  *
95  * Xvid's default 2-pass doesn't allow us to create data as we need to, so
96  * this section spends time replacing the first pass plugin so we can write
97  * statistic information as libavcodec requests in. We have another kludge
98  * that allows us to pass data to the second pass in Xvid without a custom
99  * rate-control plugin.
100  */
101 
102 /**
103  * Initialize the two-pass plugin and context.
104  *
105  * @param param Input construction parameter structure
106  * @param handle Private context handle
107  * @return Returns XVID_ERR_xxxx on failure, or 0 on success.
108  */
109 static int xvid_ff_2pass_create(xvid_plg_create_t *param, void **handle)
110 {
111  struct xvid_ff_pass1 *x = (struct xvid_ff_pass1 *) param->param;
112  char *log = x->context->twopassbuffer;
113 
114  /* Do a quick bounds check */
115  if (!log)
116  return XVID_ERR_FAIL;
117 
118  /* We use snprintf() */
119  /* This is because we can safely prevent a buffer overflow */
120  log[0] = 0;
121  snprintf(log, BUFFER_REMAINING(log),
122  "# ffmpeg 2-pass log file, using xvid codec\n");
124  "# Do not modify. libxvidcore version: %d.%d.%d\n\n",
125  XVID_VERSION_MAJOR(XVID_VERSION),
126  XVID_VERSION_MINOR(XVID_VERSION),
127  XVID_VERSION_PATCH(XVID_VERSION));
128 
129  *handle = x->context;
130  return 0;
131 }
132 
133 /**
134  * Destroy the two-pass plugin context.
135  *
136  * @param ref Context pointer for the plugin
137  * @param param Destrooy context
138  * @return Returns 0, success guaranteed
139  */
140 static int xvid_ff_2pass_destroy(struct xvid_context *ref,
141  xvid_plg_destroy_t *param)
142 {
143  /* Currently cannot think of anything to do on destruction */
144  /* Still, the framework should be here for reference/use */
145  if (ref->twopassbuffer)
146  ref->twopassbuffer[0] = 0;
147  return 0;
148 }
149 
150 /**
151  * Enable fast encode mode during the first pass.
152  *
153  * @param ref Context pointer for the plugin
154  * @param param Frame data
155  * @return Returns 0, success guaranteed
156  */
157 static int xvid_ff_2pass_before(struct xvid_context *ref,
158  xvid_plg_data_t *param)
159 {
160  int motion_remove;
161  int motion_replacements;
162  int vop_remove;
163 
164  /* Nothing to do here, result is changed too much */
165  if (param->zone && param->zone->mode == XVID_ZONE_QUANT)
166  return 0;
167 
168  /* We can implement a 'turbo' first pass mode here */
169  param->quant = 2;
170 
171  /* Init values */
172  motion_remove = ~XVID_ME_CHROMA_PVOP &
173  ~XVID_ME_CHROMA_BVOP &
174  ~XVID_ME_EXTSEARCH16 &
175  ~XVID_ME_ADVANCEDDIAMOND16;
176  motion_replacements = XVID_ME_FAST_MODEINTERPOLATE |
177  XVID_ME_SKIP_DELTASEARCH |
178  XVID_ME_FASTREFINE16 |
179  XVID_ME_BFRAME_EARLYSTOP;
180  vop_remove = ~XVID_VOP_MODEDECISION_RD &
181  ~XVID_VOP_FAST_MODEDECISION_RD &
182  ~XVID_VOP_TRELLISQUANT &
183  ~XVID_VOP_INTER4V &
184  ~XVID_VOP_HQACPRED;
185 
186  param->vol_flags &= ~XVID_VOL_GMC;
187  param->vop_flags &= vop_remove;
188  param->motion_flags &= motion_remove;
189  param->motion_flags |= motion_replacements;
190 
191  return 0;
192 }
193 
194 /**
195  * Capture statistic data and write it during first pass.
196  *
197  * @param ref Context pointer for the plugin
198  * @param param Statistic data
199  * @return Returns XVID_ERR_xxxx on failure, or 0 on success
200  */
201 static int xvid_ff_2pass_after(struct xvid_context *ref,
202  xvid_plg_data_t *param)
203 {
204  char *log = ref->twopassbuffer;
205  const char *frame_types = " ipbs";
206  char frame_type;
207 
208  /* Quick bounds check */
209  if (!log)
210  return XVID_ERR_FAIL;
211 
212  /* Convert the type given to us into a character */
213  if (param->type < 5 && param->type > 0)
214  frame_type = frame_types[param->type];
215  else
216  return XVID_ERR_FAIL;
217 
219  "%c %d %d %d %d %d %d\n",
220  frame_type, param->stats.quant, param->stats.kblks,
221  param->stats.mblks, param->stats.ublks,
222  param->stats.length, param->stats.hlength);
223 
224  return 0;
225 }
226 
227 /**
228  * Dispatch function for our custom plugin.
229  * This handles the dispatch for the Xvid plugin. It passes data
230  * on to other functions for actual processing.
231  *
232  * @param ref Context pointer for the plugin
233  * @param cmd The task given for us to complete
234  * @param p1 First parameter (varies)
235  * @param p2 Second parameter (varies)
236  * @return Returns XVID_ERR_xxxx on failure, or 0 on success
237  */
238 static int xvid_ff_2pass(void *ref, int cmd, void *p1, void *p2)
239 {
240  switch (cmd) {
241  case XVID_PLG_INFO:
242  case XVID_PLG_FRAME:
243  return 0;
244  case XVID_PLG_BEFORE:
245  return xvid_ff_2pass_before(ref, p1);
246  case XVID_PLG_CREATE:
247  return xvid_ff_2pass_create(p1, p2);
248  case XVID_PLG_AFTER:
249  return xvid_ff_2pass_after(ref, p1);
250  case XVID_PLG_DESTROY:
251  return xvid_ff_2pass_destroy(ref, p1);
252  default:
253  return XVID_ERR_FAIL;
254  }
255 }
256 
257 /**
258  * Routine to create a global VO/VOL header for MP4 container.
259  * What we do here is extract the header from the Xvid bitstream
260  * as it is encoded. We also strip the repeated headers from the
261  * bitstream when a global header is requested for MPEG-4 ISO
262  * compliance.
263  *
264  * @param avctx AVCodecContext pointer to context
265  * @param frame Pointer to encoded frame data
266  * @param header_len Length of header to search
267  * @param frame_len Length of encoded frame data
268  * @return Returns new length of frame data
269  */
271  unsigned int header_len,
272  unsigned int frame_len)
273 {
274  int vo_len = 0, i;
275 
276  for (i = 0; i < header_len - 3; i++) {
277  if (pkt->data[i] == 0x00 &&
278  pkt->data[i + 1] == 0x00 &&
279  pkt->data[i + 2] == 0x01 &&
280  pkt->data[i + 3] == 0xB6) {
281  vo_len = i;
282  break;
283  }
284  }
285 
286  if (vo_len > 0) {
287  /* We need to store the header, so extract it */
288  if (!avctx->extradata) {
289  avctx->extradata = av_malloc(vo_len);
290  if (!avctx->extradata)
291  return AVERROR(ENOMEM);
292  memcpy(avctx->extradata, pkt->data, vo_len);
293  avctx->extradata_size = vo_len;
294  }
295  /* Less dangerous now, memmove properly copies the two
296  * chunks of overlapping data */
297  memmove(pkt->data, &pkt->data[vo_len], frame_len - vo_len);
298  pkt->size = frame_len - vo_len;
299  }
300  return 0;
301 }
302 
303 /**
304  * Routine to correct a possibly erroneous framerate being fed to us.
305  * Xvid currently chokes on framerates where the ticks per frame is
306  * extremely large. This function works to correct problems in this area
307  * by estimating a new framerate and taking the simpler fraction of
308  * the two presented.
309  *
310  * @param avctx Context that contains the framerate to correct.
311  */
313 {
314  int frate, fbase;
315  int est_frate, est_fbase;
316  int gcd;
317  float est_fps, fps;
318 
319  frate = avctx->time_base.den;
320  fbase = avctx->time_base.num;
321 
322  gcd = av_gcd(frate, fbase);
323  if (gcd > 1) {
324  frate /= gcd;
325  fbase /= gcd;
326  }
327 
328  if (frate <= 65000 && fbase <= 65000) {
329  avctx->time_base.den = frate;
330  avctx->time_base.num = fbase;
331  return;
332  }
333 
334  fps = (float) frate / (float) fbase;
335  est_fps = roundf(fps * 1000.0) / 1000.0;
336 
337  est_frate = (int) est_fps;
338  if (est_fps > (int) est_fps) {
339  est_frate = (est_frate + 1) * 1000;
340  est_fbase = (int) roundf((float) est_frate / est_fps);
341  } else
342  est_fbase = 1;
343 
344  gcd = av_gcd(est_frate, est_fbase);
345  if (gcd > 1) {
346  est_frate /= gcd;
347  est_fbase /= gcd;
348  }
349 
350  if (fbase > est_fbase) {
351  avctx->time_base.den = est_frate;
352  avctx->time_base.num = est_fbase;
353  av_log(avctx, AV_LOG_DEBUG,
354  "Xvid: framerate re-estimated: %.2f, %.3f%% correction\n",
355  est_fps, (((est_fps - fps) / fps) * 100.0));
356  } else {
357  avctx->time_base.den = frate;
358  avctx->time_base.num = fbase;
359  }
360 }
361 
363 {
364  int xerr, i, ret = -1;
365  int xvid_flags = avctx->flags;
366  struct xvid_context *x = avctx->priv_data;
367  uint16_t *intra, *inter;
368  int fd;
369 
370  xvid_plugin_single_t single = { 0 };
371  struct xvid_ff_pass1 rc2pass1 = { 0 };
372  xvid_plugin_2pass2_t rc2pass2 = { 0 };
373  xvid_plugin_lumimasking_t masking_l = { 0 }; /* For lumi masking */
374  xvid_plugin_lumimasking_t masking_v = { 0 }; /* For variance AQ */
375  xvid_plugin_ssim_t ssim = { 0 };
376  xvid_gbl_init_t xvid_gbl_init = { 0 };
377  xvid_enc_create_t xvid_enc_create = { 0 };
378  xvid_enc_plugin_t plugins[4];
379 
380  x->twopassfd = -1;
381 
382  /* Bring in VOP flags from ffmpeg command-line */
383  x->vop_flags = XVID_VOP_HALFPEL; /* Bare minimum quality */
384  if (xvid_flags & CODEC_FLAG_4MV)
385  x->vop_flags |= XVID_VOP_INTER4V; /* Level 3 */
386  if (avctx->trellis)
387  x->vop_flags |= XVID_VOP_TRELLISQUANT; /* Level 5 */
388  if (xvid_flags & CODEC_FLAG_AC_PRED)
389  x->vop_flags |= XVID_VOP_HQACPRED; /* Level 6 */
390  if (xvid_flags & CODEC_FLAG_GRAY)
391  x->vop_flags |= XVID_VOP_GREYSCALE;
392 
393  /* Decide which ME quality setting to use */
394  x->me_flags = 0;
395  switch (avctx->me_method) {
396  case ME_FULL: /* Quality 6 */
397  x->me_flags |= XVID_ME_EXTSEARCH16 |
398  XVID_ME_EXTSEARCH8;
399 
400  case ME_EPZS: /* Quality 4 */
401  x->me_flags |= XVID_ME_ADVANCEDDIAMOND8 |
402  XVID_ME_HALFPELREFINE8 |
403  XVID_ME_CHROMA_PVOP |
404  XVID_ME_CHROMA_BVOP;
405 
406  case ME_LOG: /* Quality 2 */
407  case ME_PHODS:
408  case ME_X1:
409  x->me_flags |= XVID_ME_ADVANCEDDIAMOND16 |
410  XVID_ME_HALFPELREFINE16;
411 
412  case ME_ZERO: /* Quality 0 */
413  default:
414  break;
415  }
416 
417  /* Decide how we should decide blocks */
418  switch (avctx->mb_decision) {
419  case 2:
420  x->vop_flags |= XVID_VOP_MODEDECISION_RD;
421  x->me_flags |= XVID_ME_HALFPELREFINE8_RD |
422  XVID_ME_QUARTERPELREFINE8_RD |
423  XVID_ME_EXTSEARCH_RD |
424  XVID_ME_CHECKPREDICTION_RD;
425  case 1:
426  if (!(x->vop_flags & XVID_VOP_MODEDECISION_RD))
427  x->vop_flags |= XVID_VOP_FAST_MODEDECISION_RD;
428  x->me_flags |= XVID_ME_HALFPELREFINE16_RD |
429  XVID_ME_QUARTERPELREFINE16_RD;
430  default:
431  break;
432  }
433 
434  /* Bring in VOL flags from ffmpeg command-line */
435 #if FF_API_GMC
436  if (avctx->flags & CODEC_FLAG_GMC)
437  x->gmc = 1;
438 #endif
439 
440  x->vol_flags = 0;
441  if (x->gmc) {
442  x->vol_flags |= XVID_VOL_GMC;
443  x->me_flags |= XVID_ME_GME_REFINE;
444  }
445  if (xvid_flags & CODEC_FLAG_QPEL) {
446  x->vol_flags |= XVID_VOL_QUARTERPEL;
447  x->me_flags |= XVID_ME_QUARTERPELREFINE16;
448  if (x->vop_flags & XVID_VOP_INTER4V)
449  x->me_flags |= XVID_ME_QUARTERPELREFINE8;
450  }
451 
452  xvid_gbl_init.version = XVID_VERSION;
453  xvid_gbl_init.debug = 0;
454  xvid_gbl_init.cpu_flags = 0;
455 
456  /* Initialize */
457  xvid_global(NULL, XVID_GBL_INIT, &xvid_gbl_init, NULL);
458 
459  /* Create the encoder reference */
460  xvid_enc_create.version = XVID_VERSION;
461 
462  /* Store the desired frame size */
463  xvid_enc_create.width =
464  x->xsize = avctx->width;
465  xvid_enc_create.height =
466  x->ysize = avctx->height;
467 
468  /* Xvid can determine the proper profile to use */
469  /* xvid_enc_create.profile = XVID_PROFILE_S_L3; */
470 
471  /* We don't use zones */
472  xvid_enc_create.zones = NULL;
473  xvid_enc_create.num_zones = 0;
474 
475  xvid_enc_create.num_threads = avctx->thread_count;
476 #if (XVID_VERSION <= 0x010303) && (XVID_VERSION >= 0x010300)
477  /* workaround for a bug in libxvidcore */
478  if (avctx->height <= 16) {
479  if (avctx->thread_count < 2) {
480  xvid_enc_create.num_threads = 0;
481  } else {
482  av_log(avctx, AV_LOG_ERROR,
483  "Too small height for threads > 1.");
484  ret = AVERROR(EINVAL);
485  goto fail;
486  }
487  }
488 #endif
489 
490  xvid_enc_create.plugins = plugins;
491  xvid_enc_create.num_plugins = 0;
492 
493  /* Initialize Buffers */
494  x->twopassbuffer = NULL;
495  x->old_twopassbuffer = NULL;
496  x->twopassfile = NULL;
497 
498  if (xvid_flags & CODEC_FLAG_PASS1) {
499  rc2pass1.version = XVID_VERSION;
500  rc2pass1.context = x;
503  if (!x->twopassbuffer || !x->old_twopassbuffer) {
504  av_log(avctx, AV_LOG_ERROR,
505  "Xvid: Cannot allocate 2-pass log buffers\n");
506  ret = AVERROR(ENOMEM);
507  goto fail;
508  }
509  x->twopassbuffer[0] =
510  x->old_twopassbuffer[0] = 0;
511 
512  plugins[xvid_enc_create.num_plugins].func = xvid_ff_2pass;
513  plugins[xvid_enc_create.num_plugins].param = &rc2pass1;
514  xvid_enc_create.num_plugins++;
515  } else if (xvid_flags & CODEC_FLAG_PASS2) {
516  rc2pass2.version = XVID_VERSION;
517  rc2pass2.bitrate = avctx->bit_rate;
518 
519  fd = av_tempfile("xvidff.", &x->twopassfile, 0, avctx);
520  if (fd < 0) {
521  av_log(avctx, AV_LOG_ERROR, "Xvid: Cannot write 2-pass pipe\n");
522  ret = fd;
523  goto fail;
524  }
525  x->twopassfd = fd;
526 
527  if (!avctx->stats_in) {
528  av_log(avctx, AV_LOG_ERROR,
529  "Xvid: No 2-pass information loaded for second pass\n");
530  ret = AVERROR(EINVAL);
531  goto fail;
532  }
533 
534  ret = write(fd, avctx->stats_in, strlen(avctx->stats_in));
535  if (ret == -1)
536  ret = AVERROR(errno);
537  else if (strlen(avctx->stats_in) > ret) {
538  av_log(avctx, AV_LOG_ERROR, "Xvid: Cannot write to 2-pass pipe\n");
539  ret = AVERROR(EIO);
540  }
541  if (ret < 0)
542  goto fail;
543 
544  rc2pass2.filename = x->twopassfile;
545  plugins[xvid_enc_create.num_plugins].func = xvid_plugin_2pass2;
546  plugins[xvid_enc_create.num_plugins].param = &rc2pass2;
547  xvid_enc_create.num_plugins++;
548  } else if (!(xvid_flags & CODEC_FLAG_QSCALE)) {
549  /* Single Pass Bitrate Control! */
550  single.version = XVID_VERSION;
551  single.bitrate = avctx->bit_rate;
552 
553  plugins[xvid_enc_create.num_plugins].func = xvid_plugin_single;
554  plugins[xvid_enc_create.num_plugins].param = &single;
555  xvid_enc_create.num_plugins++;
556  }
557 
558  if (avctx->lumi_masking != 0.0)
559  x->lumi_aq = 1;
560 
561  /* Luminance Masking */
562  if (x->lumi_aq) {
563  masking_l.method = 0;
564  plugins[xvid_enc_create.num_plugins].func = xvid_plugin_lumimasking;
565 
566  /* The old behavior is that when avctx->lumi_masking is specified,
567  * plugins[...].param = NULL. Trying to keep the old behavior here. */
568  plugins[xvid_enc_create.num_plugins].param =
569  avctx->lumi_masking ? NULL : &masking_l;
570  xvid_enc_create.num_plugins++;
571  }
572 
573  /* Variance AQ */
574  if (x->variance_aq) {
575  masking_v.method = 1;
576  plugins[xvid_enc_create.num_plugins].func = xvid_plugin_lumimasking;
577  plugins[xvid_enc_create.num_plugins].param = &masking_v;
578  xvid_enc_create.num_plugins++;
579  }
580 
581  if (x->lumi_aq && x->variance_aq )
582  av_log(avctx, AV_LOG_INFO,
583  "Both lumi_aq and variance_aq are enabled. The resulting quality"
584  "will be the worse one of the two effects made by the AQ.\n");
585 
586  /* SSIM */
587  if (x->ssim) {
588  plugins[xvid_enc_create.num_plugins].func = xvid_plugin_ssim;
589  ssim.b_printstat = x->ssim == 2;
590  ssim.acc = x->ssim_acc;
591  ssim.cpu_flags = xvid_gbl_init.cpu_flags;
592  ssim.b_visualize = 0;
593  plugins[xvid_enc_create.num_plugins].param = &ssim;
594  xvid_enc_create.num_plugins++;
595  }
596 
597  /* Frame Rate and Key Frames */
598  xvid_correct_framerate(avctx);
599  xvid_enc_create.fincr = avctx->time_base.num;
600  xvid_enc_create.fbase = avctx->time_base.den;
601  if (avctx->gop_size > 0)
602  xvid_enc_create.max_key_interval = avctx->gop_size;
603  else
604  xvid_enc_create.max_key_interval = 240; /* Xvid's best default */
605 
606  /* Quants */
607  if (xvid_flags & CODEC_FLAG_QSCALE)
608  x->qscale = 1;
609  else
610  x->qscale = 0;
611 
612  xvid_enc_create.min_quant[0] = avctx->qmin;
613  xvid_enc_create.min_quant[1] = avctx->qmin;
614  xvid_enc_create.min_quant[2] = avctx->qmin;
615  xvid_enc_create.max_quant[0] = avctx->qmax;
616  xvid_enc_create.max_quant[1] = avctx->qmax;
617  xvid_enc_create.max_quant[2] = avctx->qmax;
618 
619  /* Quant Matrices */
620  x->intra_matrix =
621  x->inter_matrix = NULL;
622  if (avctx->mpeg_quant)
623  x->vol_flags |= XVID_VOL_MPEGQUANT;
624  if ((avctx->intra_matrix || avctx->inter_matrix)) {
625  x->vol_flags |= XVID_VOL_MPEGQUANT;
626 
627  if (avctx->intra_matrix) {
628  intra = avctx->intra_matrix;
629  x->intra_matrix = av_malloc(sizeof(unsigned char) * 64);
630  if (!x->intra_matrix) {
631  ret = AVERROR(ENOMEM);
632  goto fail;
633  }
634  } else
635  intra = NULL;
636  if (avctx->inter_matrix) {
637  inter = avctx->inter_matrix;
638  x->inter_matrix = av_malloc(sizeof(unsigned char) * 64);
639  if (!x->inter_matrix) {
640  ret = AVERROR(ENOMEM);
641  goto fail;
642  }
643  } else
644  inter = NULL;
645 
646  for (i = 0; i < 64; i++) {
647  if (intra)
648  x->intra_matrix[i] = (unsigned char) intra[i];
649  if (inter)
650  x->inter_matrix[i] = (unsigned char) inter[i];
651  }
652  }
653 
654  /* Misc Settings */
655  xvid_enc_create.frame_drop_ratio = 0;
656  xvid_enc_create.global = 0;
657  if (xvid_flags & CODEC_FLAG_CLOSED_GOP)
658  xvid_enc_create.global |= XVID_GLOBAL_CLOSED_GOP;
659 
660  /* Determines which codec mode we are operating in */
661  avctx->extradata = NULL;
662  avctx->extradata_size = 0;
663  if (xvid_flags & CODEC_FLAG_GLOBAL_HEADER) {
664  /* In this case, we are claiming to be MPEG4 */
665  x->quicktime_format = 1;
666  avctx->codec_id = AV_CODEC_ID_MPEG4;
667  } else {
668  /* We are claiming to be Xvid */
669  x->quicktime_format = 0;
670  if (!avctx->codec_tag)
671  avctx->codec_tag = AV_RL32("xvid");
672  }
673 
674  /* Bframes */
675  xvid_enc_create.max_bframes = avctx->max_b_frames;
676  xvid_enc_create.bquant_offset = 100 * avctx->b_quant_offset;
677  xvid_enc_create.bquant_ratio = 100 * avctx->b_quant_factor;
678  if (avctx->max_b_frames > 0 && !x->quicktime_format)
679  xvid_enc_create.global |= XVID_GLOBAL_PACKED;
680 
681  av_assert0(xvid_enc_create.num_plugins + (!!x->ssim) + (!!x->variance_aq) + (!!x->lumi_aq) <= FF_ARRAY_ELEMS(plugins));
682 
683  /* Create encoder context */
684  xerr = xvid_encore(NULL, XVID_ENC_CREATE, &xvid_enc_create, NULL);
685  if (xerr) {
686  av_log(avctx, AV_LOG_ERROR, "Xvid: Could not create encoder reference\n");
687  goto fail;
688  }
689 
690  x->encoder_handle = xvid_enc_create.handle;
691  avctx->coded_frame = av_frame_alloc();
692  if (!avctx->coded_frame) {
693  ret = AVERROR(ENOMEM);
694  goto fail;
695  }
696 
697  return 0;
698 fail:
699  xvid_encode_close(avctx);
700  return ret;
701 }
702 
704  const AVFrame *picture, int *got_packet)
705 {
706  int xerr, i, ret, user_packet = !!pkt->data;
707  struct xvid_context *x = avctx->priv_data;
708  AVFrame *p = avctx->coded_frame;
709  int mb_width = (avctx->width + 15) / 16;
710  int mb_height = (avctx->height + 15) / 16;
711  char *tmp;
712 
713  xvid_enc_frame_t xvid_enc_frame = { 0 };
714  xvid_enc_stats_t xvid_enc_stats = { 0 };
715 
716  if ((ret = ff_alloc_packet2(avctx, pkt, mb_width*(int64_t)mb_height*MAX_MB_BYTES + FF_MIN_BUFFER_SIZE)) < 0)
717  return ret;
718 
719  /* Start setting up the frame */
720  xvid_enc_frame.version = XVID_VERSION;
721  xvid_enc_stats.version = XVID_VERSION;
722 
723  /* Let Xvid know where to put the frame. */
724  xvid_enc_frame.bitstream = pkt->data;
725  xvid_enc_frame.length = pkt->size;
726 
727  /* Initialize input image fields */
728  if (avctx->pix_fmt != AV_PIX_FMT_YUV420P) {
729  av_log(avctx, AV_LOG_ERROR,
730  "Xvid: Color spaces other than 420P not supported\n");
731  return AVERROR(EINVAL);
732  }
733 
734  xvid_enc_frame.input.csp = XVID_CSP_PLANAR; /* YUV420P */
735 
736  for (i = 0; i < 4; i++) {
737  xvid_enc_frame.input.plane[i] = picture->data[i];
738  xvid_enc_frame.input.stride[i] = picture->linesize[i];
739  }
740 
741  /* Encoder Flags */
742  xvid_enc_frame.vop_flags = x->vop_flags;
743  xvid_enc_frame.vol_flags = x->vol_flags;
744  xvid_enc_frame.motion = x->me_flags;
745  xvid_enc_frame.type =
746  picture->pict_type == AV_PICTURE_TYPE_I ? XVID_TYPE_IVOP :
747  picture->pict_type == AV_PICTURE_TYPE_P ? XVID_TYPE_PVOP :
748  picture->pict_type == AV_PICTURE_TYPE_B ? XVID_TYPE_BVOP :
749  XVID_TYPE_AUTO;
750 
751  /* Pixel aspect ratio setting */
752  if (avctx->sample_aspect_ratio.num < 0 || avctx->sample_aspect_ratio.num > 255 ||
753  avctx->sample_aspect_ratio.den < 0 || avctx->sample_aspect_ratio.den > 255) {
754  av_log(avctx, AV_LOG_WARNING,
755  "Invalid pixel aspect ratio %i/%i, limit is 255/255 reducing\n",
758  avctx->sample_aspect_ratio.num, avctx->sample_aspect_ratio.den, 255);
759  }
760  xvid_enc_frame.par = XVID_PAR_EXT;
761  xvid_enc_frame.par_width = avctx->sample_aspect_ratio.num;
762  xvid_enc_frame.par_height = avctx->sample_aspect_ratio.den;
763 
764  /* Quant Setting */
765  if (x->qscale)
766  xvid_enc_frame.quant = picture->quality / FF_QP2LAMBDA;
767  else
768  xvid_enc_frame.quant = 0;
769 
770  /* Matrices */
771  xvid_enc_frame.quant_intra_matrix = x->intra_matrix;
772  xvid_enc_frame.quant_inter_matrix = x->inter_matrix;
773 
774  /* Encode */
775  xerr = xvid_encore(x->encoder_handle, XVID_ENC_ENCODE,
776  &xvid_enc_frame, &xvid_enc_stats);
777 
778  /* Two-pass log buffer swapping */
779  avctx->stats_out = NULL;
780  if (x->twopassbuffer) {
781  tmp = x->old_twopassbuffer;
783  x->twopassbuffer = tmp;
784  x->twopassbuffer[0] = 0;
785  if (x->old_twopassbuffer[0] != 0) {
786  avctx->stats_out = x->old_twopassbuffer;
787  }
788  }
789 
790  if (xerr > 0) {
791  *got_packet = 1;
792 
793  p->quality = xvid_enc_stats.quant * FF_QP2LAMBDA;
794  if (xvid_enc_stats.type == XVID_TYPE_PVOP)
796  else if (xvid_enc_stats.type == XVID_TYPE_BVOP)
798  else if (xvid_enc_stats.type == XVID_TYPE_SVOP)
800  else
802  if (xvid_enc_frame.out_flags & XVID_KEYFRAME) {
803  p->key_frame = 1;
804  pkt->flags |= AV_PKT_FLAG_KEY;
805  if (x->quicktime_format)
806  return xvid_strip_vol_header(avctx, pkt,
807  xvid_enc_stats.hlength, xerr);
808  } else
809  p->key_frame = 0;
810 
811  pkt->size = xerr;
812 
813  return 0;
814  } else {
815  if (!user_packet)
816  av_free_packet(pkt);
817  if (!xerr)
818  return 0;
819  av_log(avctx, AV_LOG_ERROR,
820  "Xvid: Encoding Error Occurred: %i\n", xerr);
821  return AVERROR_EXTERNAL;
822  }
823 }
824 
826 {
827  struct xvid_context *x = avctx->priv_data;
828 
829  if(x->encoder_handle)
830  xvid_encore(x->encoder_handle, XVID_ENC_DESTROY, NULL, NULL);
831  x->encoder_handle = NULL;
832 
833  av_freep(&avctx->extradata);
834  if (x->twopassbuffer) {
835  av_freep(&x->twopassbuffer);
837  avctx->stats_out = NULL;
838  }
839  if (x->twopassfd>=0) {
840  unlink(x->twopassfile);
841  close(x->twopassfd);
842  x->twopassfd = -1;
843  }
844  av_freep(&x->twopassfile);
845  av_freep(&x->intra_matrix);
846  av_freep(&x->inter_matrix);
847  av_frame_free(&avctx->coded_frame);
848 
849  return 0;
850 }
851 
852 #define OFFSET(x) offsetof(struct xvid_context, x)
853 #define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
854 static const AVOption options[] = {
855  { "lumi_aq", "Luminance masking AQ", OFFSET(lumi_aq), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE },
856  { "variance_aq", "Variance AQ", OFFSET(variance_aq), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE },
857  { "ssim", "Show SSIM information to stdout", OFFSET(ssim), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 2, VE, "ssim" },
858  { "off", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = 0 }, INT_MIN, INT_MAX, VE, "ssim" },
859  { "avg", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = 1 }, INT_MIN, INT_MAX, VE, "ssim" },
860  { "frame", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = 2 }, INT_MIN, INT_MAX, VE, "ssim" },
861  { "ssim_acc", "SSIM accuracy", OFFSET(ssim_acc), AV_OPT_TYPE_INT, { .i64 = 2 }, 0, 4, VE },
862  { "gmc", "use GMC", OFFSET(gmc), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE },
863  { NULL },
864 };
865 
866 static const AVClass xvid_class = {
867  .class_name = "libxvid",
868  .item_name = av_default_item_name,
869  .option = options,
870  .version = LIBAVUTIL_VERSION_INT,
871 };
872 
874  .name = "libxvid",
875  .long_name = NULL_IF_CONFIG_SMALL("libxvidcore MPEG-4 part 2"),
876  .type = AVMEDIA_TYPE_VIDEO,
877  .id = AV_CODEC_ID_MPEG4,
878  .priv_data_size = sizeof(struct xvid_context),
879  .init = xvid_encode_init,
880  .encode2 = xvid_encode_frame,
881  .close = xvid_encode_close,
882  .pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV420P, AV_PIX_FMT_NONE },
883  .priv_class = &xvid_class,
884 };