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mjpegenc.c
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1 /*
2  * MJPEG encoder
3  * Copyright (c) 2000, 2001 Fabrice Bellard
4  * Copyright (c) 2003 Alex Beregszaszi
5  * Copyright (c) 2003-2004 Michael Niedermayer
6  *
7  * Support for external huffman table, various fixes (AVID workaround),
8  * aspecting, new decode_frame mechanism and apple mjpeg-b support
9  * by Alex Beregszaszi
10  *
11  * This file is part of FFmpeg.
12  *
13  * FFmpeg is free software; you can redistribute it and/or
14  * modify it under the terms of the GNU Lesser General Public
15  * License as published by the Free Software Foundation; either
16  * version 2.1 of the License, or (at your option) any later version.
17  *
18  * FFmpeg is distributed in the hope that it will be useful,
19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
21  * Lesser General Public License for more details.
22  *
23  * You should have received a copy of the GNU Lesser General Public
24  * License along with FFmpeg; if not, write to the Free Software
25  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
26  */
27 
28 /**
29  * @file
30  * MJPEG encoder.
31  */
32 
33 #include "avcodec.h"
34 #include "mpegvideo.h"
35 #include "mjpeg.h"
36 #include "mjpegenc.h"
37 
38 /* use two quantizer tables (one for luminance and one for chrominance) */
39 /* not yet working */
40 #undef TWOMATRIXES
41 
42 
44 {
45  MJpegContext *m;
46 
47  if (s->width > 65500 || s->height > 65500) {
48  av_log(s, AV_LOG_ERROR, "JPEG does not support resolutions above 65500x65500\n");
49  return -1;
50  }
51 
52  m = av_malloc(sizeof(MJpegContext));
53  if (!m)
54  return -1;
55 
56  s->min_qcoeff=-1023;
57  s->max_qcoeff= 1023;
58 
59  /* build all the huffman tables */
76 
77  s->mjpeg_ctx = m;
78  return 0;
79 }
80 
82 {
83  av_free(s->mjpeg_ctx);
84 }
85 
86 /* table_class: 0 = DC coef, 1 = AC coefs */
87 static int put_huffman_table(MpegEncContext *s, int table_class, int table_id,
88  const uint8_t *bits_table, const uint8_t *value_table)
89 {
90  PutBitContext *p = &s->pb;
91  int n, i;
92 
93  put_bits(p, 4, table_class);
94  put_bits(p, 4, table_id);
95 
96  n = 0;
97  for(i=1;i<=16;i++) {
98  n += bits_table[i];
99  put_bits(p, 8, bits_table[i]);
100  }
101 
102  for(i=0;i<n;i++)
103  put_bits(p, 8, value_table[i]);
104 
105  return n + 17;
106 }
107 
109 {
110  PutBitContext *p = &s->pb;
111  int i, j, size;
112  uint8_t *ptr;
113 
114  /* quant matrixes */
115  put_marker(p, DQT);
116 #ifdef TWOMATRIXES
117  put_bits(p, 16, 2 + 2 * (1 + 64));
118 #else
119  put_bits(p, 16, 2 + 1 * (1 + 64));
120 #endif
121  put_bits(p, 4, 0); /* 8 bit precision */
122  put_bits(p, 4, 0); /* table 0 */
123  for(i=0;i<64;i++) {
124  j = s->intra_scantable.permutated[i];
125  put_bits(p, 8, s->intra_matrix[j]);
126  }
127 #ifdef TWOMATRIXES
128  put_bits(p, 4, 0); /* 8 bit precision */
129  put_bits(p, 4, 1); /* table 1 */
130  for(i=0;i<64;i++) {
131  j = s->intra_scantable.permutated[i];
132  put_bits(p, 8, s->chroma_intra_matrix[j]);
133  }
134 #endif
135 
137  put_marker(p, DRI);
138  put_bits(p, 16, 4);
139  put_bits(p, 16, (s->width-1)/(8*s->mjpeg_hsample[0]) + 1);
140  }
141 
142  /* huffman table */
143  put_marker(p, DHT);
144  flush_put_bits(p);
145  ptr = put_bits_ptr(p);
146  put_bits(p, 16, 0); /* patched later */
147  size = 2;
152 
157  AV_WB16(ptr, size);
158 }
159 
161 {
162  PutBitContext *p = &s->pb;
163  int size;
164  uint8_t *ptr;
165 
166  if (s->avctx->sample_aspect_ratio.num /* && !lossless */)
167  {
168  /* JFIF header */
169  put_marker(p, APP0);
170  put_bits(p, 16, 16);
171  avpriv_put_string(p, "JFIF", 1); /* this puts the trailing zero-byte too */
172  put_bits(p, 16, 0x0102); /* v 1.02 */
173  put_bits(p, 8, 0); /* units type: 0 - aspect ratio */
176  put_bits(p, 8, 0); /* thumbnail width */
177  put_bits(p, 8, 0); /* thumbnail height */
178  }
179 
180  /* comment */
181  if(!(s->flags & CODEC_FLAG_BITEXACT)){
182  put_marker(p, COM);
183  flush_put_bits(p);
184  ptr = put_bits_ptr(p);
185  put_bits(p, 16, 0); /* patched later */
187  size = strlen(LIBAVCODEC_IDENT)+3;
188  AV_WB16(ptr, size);
189  }
190 
191  if( s->avctx->pix_fmt == AV_PIX_FMT_YUV420P
193  ||s->avctx->pix_fmt == AV_PIX_FMT_YUV444P){
194  put_marker(p, COM);
195  flush_put_bits(p);
196  ptr = put_bits_ptr(p);
197  put_bits(p, 16, 0); /* patched later */
198  avpriv_put_string(p, "CS=ITU601", 1);
199  size = strlen("CS=ITU601")+3;
200  AV_WB16(ptr, size);
201  }
202 }
203 
205 {
206  const int lossless= s->avctx->codec_id != AV_CODEC_ID_MJPEG;
207  int i;
208 
209  put_marker(&s->pb, SOI);
210 
211  // hack for AMV mjpeg format
212  if(s->avctx->codec_id == AV_CODEC_ID_AMV) goto end;
213 
215 
217 
218  switch(s->avctx->codec_id){
219  case AV_CODEC_ID_MJPEG: put_marker(&s->pb, SOF0 ); break;
220  case AV_CODEC_ID_LJPEG: put_marker(&s->pb, SOF3 ); break;
221  default: av_assert0(0);
222  }
223 
224  put_bits(&s->pb, 16, 17);
225  if(lossless && (s->avctx->pix_fmt == AV_PIX_FMT_BGR0
226  || s->avctx->pix_fmt == AV_PIX_FMT_BGRA
227  || s->avctx->pix_fmt == AV_PIX_FMT_BGR24))
228  put_bits(&s->pb, 8, 9); /* 9 bits/component RCT */
229  else
230  put_bits(&s->pb, 8, 8); /* 8 bits/component */
231  put_bits(&s->pb, 16, s->height);
232  put_bits(&s->pb, 16, s->width);
233  put_bits(&s->pb, 8, 3); /* 3 components */
234 
235  /* Y component */
236  put_bits(&s->pb, 8, 1); /* component number */
237  put_bits(&s->pb, 4, s->mjpeg_hsample[0]); /* H factor */
238  put_bits(&s->pb, 4, s->mjpeg_vsample[0]); /* V factor */
239  put_bits(&s->pb, 8, 0); /* select matrix */
240 
241  /* Cb component */
242  put_bits(&s->pb, 8, 2); /* component number */
243  put_bits(&s->pb, 4, s->mjpeg_hsample[1]); /* H factor */
244  put_bits(&s->pb, 4, s->mjpeg_vsample[1]); /* V factor */
245 #ifdef TWOMATRIXES
246  put_bits(&s->pb, 8, lossless ? 0 : 1); /* select matrix */
247 #else
248  put_bits(&s->pb, 8, 0); /* select matrix */
249 #endif
250 
251  /* Cr component */
252  put_bits(&s->pb, 8, 3); /* component number */
253  put_bits(&s->pb, 4, s->mjpeg_hsample[2]); /* H factor */
254  put_bits(&s->pb, 4, s->mjpeg_vsample[2]); /* V factor */
255 #ifdef TWOMATRIXES
256  put_bits(&s->pb, 8, lossless ? 0 : 1); /* select matrix */
257 #else
258  put_bits(&s->pb, 8, 0); /* select matrix */
259 #endif
260 
261  /* scan header */
262  put_marker(&s->pb, SOS);
263  put_bits(&s->pb, 16, 12); /* length */
264  put_bits(&s->pb, 8, 3); /* 3 components */
265 
266  /* Y component */
267  put_bits(&s->pb, 8, 1); /* index */
268  put_bits(&s->pb, 4, 0); /* DC huffman table index */
269  put_bits(&s->pb, 4, 0); /* AC huffman table index */
270 
271  /* Cb component */
272  put_bits(&s->pb, 8, 2); /* index */
273  put_bits(&s->pb, 4, 1); /* DC huffman table index */
274  put_bits(&s->pb, 4, lossless ? 0 : 1); /* AC huffman table index */
275 
276  /* Cr component */
277  put_bits(&s->pb, 8, 3); /* index */
278  put_bits(&s->pb, 4, 1); /* DC huffman table index */
279  put_bits(&s->pb, 4, lossless ? 0 : 1); /* AC huffman table index */
280 
281  put_bits(&s->pb, 8, lossless ? s->avctx->prediction_method+1 : 0); /* Ss (not used) */
282 
283  switch(s->avctx->codec_id){
284  case AV_CODEC_ID_MJPEG: put_bits(&s->pb, 8, 63); break; /* Se (not used) */
285  case AV_CODEC_ID_LJPEG: put_bits(&s->pb, 8, 0); break; /* not used */
286  default: av_assert0(0);
287  }
288 
289  put_bits(&s->pb, 8, 0); /* Ah/Al (not used) */
290 
291 end:
292  s->esc_pos = put_bits_count(&s->pb) >> 3;
293  for(i=1; i<s->slice_context_count; i++)
294  s->thread_context[i]->esc_pos = 0;
295 }
296 
297 static void escape_FF(MpegEncContext *s, int start)
298 {
299  int size= put_bits_count(&s->pb) - start*8;
300  int i, ff_count;
301  uint8_t *buf= s->pb.buf + start;
302  int align= (-(size_t)(buf))&3;
303 
304  av_assert1((size&7) == 0);
305  size >>= 3;
306 
307  ff_count=0;
308  for(i=0; i<size && i<align; i++){
309  if(buf[i]==0xFF) ff_count++;
310  }
311  for(; i<size-15; i+=16){
312  int acc, v;
313 
314  v= *(uint32_t*)(&buf[i]);
315  acc= (((v & (v>>4))&0x0F0F0F0F)+0x01010101)&0x10101010;
316  v= *(uint32_t*)(&buf[i+4]);
317  acc+=(((v & (v>>4))&0x0F0F0F0F)+0x01010101)&0x10101010;
318  v= *(uint32_t*)(&buf[i+8]);
319  acc+=(((v & (v>>4))&0x0F0F0F0F)+0x01010101)&0x10101010;
320  v= *(uint32_t*)(&buf[i+12]);
321  acc+=(((v & (v>>4))&0x0F0F0F0F)+0x01010101)&0x10101010;
322 
323  acc>>=4;
324  acc+= (acc>>16);
325  acc+= (acc>>8);
326  ff_count+= acc&0xFF;
327  }
328  for(; i<size; i++){
329  if(buf[i]==0xFF) ff_count++;
330  }
331 
332  if(ff_count==0) return;
333 
334  flush_put_bits(&s->pb);
335  skip_put_bytes(&s->pb, ff_count);
336 
337  for(i=size-1; ff_count; i--){
338  int v= buf[i];
339 
340  if(v==0xFF){
341  buf[i+ff_count]= 0;
342  ff_count--;
343  }
344 
345  buf[i+ff_count]= v;
346  }
347 }
348 
350 {
351  int length, i;
352  PutBitContext *pbc = &s->pb;
353  int mb_y = s->mb_y - !s->mb_x;
354  length= (-put_bits_count(pbc))&7;
355  if(length) put_bits(pbc, length, (1<<length)-1);
356 
357  flush_put_bits(&s->pb);
358  escape_FF(s, s->esc_pos);
359 
360  if((s->avctx->active_thread_type & FF_THREAD_SLICE) && mb_y < s->mb_height)
361  put_marker(pbc, RST0 + (mb_y&7));
362  s->esc_pos = put_bits_count(pbc) >> 3;
363 
364  for(i=0; i<3; i++)
365  s->last_dc[i] = 128 << s->intra_dc_precision;
366 }
367 
369 {
370 
371  av_assert1((s->header_bits&7)==0);
372 
373 
374  put_marker(&s->pb, EOI);
375 }
376 
378  uint8_t *huff_size, uint16_t *huff_code)
379 {
380  int mant, nbits;
381 
382  if (val == 0) {
383  put_bits(&s->pb, huff_size[0], huff_code[0]);
384  } else {
385  mant = val;
386  if (val < 0) {
387  val = -val;
388  mant--;
389  }
390 
391  nbits= av_log2_16bit(val) + 1;
392 
393  put_bits(&s->pb, huff_size[nbits], huff_code[nbits]);
394 
395  put_sbits(&s->pb, nbits, mant);
396  }
397 }
398 
399 static void encode_block(MpegEncContext *s, int16_t *block, int n)
400 {
401  int mant, nbits, code, i, j;
402  int component, dc, run, last_index, val;
403  MJpegContext *m = s->mjpeg_ctx;
404  uint8_t *huff_size_ac;
405  uint16_t *huff_code_ac;
406 
407  /* DC coef */
408  component = (n <= 3 ? 0 : (n&1) + 1);
409  dc = block[0]; /* overflow is impossible */
410  val = dc - s->last_dc[component];
411  if (n < 4) {
413  huff_size_ac = m->huff_size_ac_luminance;
414  huff_code_ac = m->huff_code_ac_luminance;
415  } else {
417  huff_size_ac = m->huff_size_ac_chrominance;
418  huff_code_ac = m->huff_code_ac_chrominance;
419  }
420  s->last_dc[component] = dc;
421 
422  /* AC coefs */
423 
424  run = 0;
425  last_index = s->block_last_index[n];
426  for(i=1;i<=last_index;i++) {
427  j = s->intra_scantable.permutated[i];
428  val = block[j];
429  if (val == 0) {
430  run++;
431  } else {
432  while (run >= 16) {
433  put_bits(&s->pb, huff_size_ac[0xf0], huff_code_ac[0xf0]);
434  run -= 16;
435  }
436  mant = val;
437  if (val < 0) {
438  val = -val;
439  mant--;
440  }
441 
442  nbits= av_log2(val) + 1;
443  code = (run << 4) | nbits;
444 
445  put_bits(&s->pb, huff_size_ac[code], huff_code_ac[code]);
446 
447  put_sbits(&s->pb, nbits, mant);
448  run = 0;
449  }
450  }
451 
452  /* output EOB only if not already 64 values */
453  if (last_index < 63 || run != 0)
454  put_bits(&s->pb, huff_size_ac[0], huff_code_ac[0]);
455 }
456 
457 void ff_mjpeg_encode_mb(MpegEncContext *s, int16_t block[6][64])
458 {
459  int i;
460  if (s->chroma_format == CHROMA_444) {
461  encode_block(s, block[0], 0);
462  encode_block(s, block[2], 2);
463  encode_block(s, block[4], 4);
464  encode_block(s, block[8], 8);
465  encode_block(s, block[5], 5);
466  encode_block(s, block[9], 9);
467 
468  if (16*s->mb_x+8 < s->width) {
469  encode_block(s, block[1], 1);
470  encode_block(s, block[3], 3);
471  encode_block(s, block[6], 6);
472  encode_block(s, block[10], 10);
473  encode_block(s, block[7], 7);
474  encode_block(s, block[11], 11);
475  }
476  } else {
477  for(i=0;i<5;i++) {
478  encode_block(s, block[i], i);
479  }
480  if (s->chroma_format == CHROMA_420) {
481  encode_block(s, block[5], 5);
482  } else {
483  encode_block(s, block[6], 6);
484  encode_block(s, block[5], 5);
485  encode_block(s, block[7], 7);
486  }
487  }
488 
489  s->i_tex_bits += get_bits_diff(s);
490 }
491 
492 // maximum over s->mjpeg_vsample[i]
493 #define V_MAX 2
495  const AVFrame *pic_arg, int *got_packet)
496 
497 {
498  MpegEncContext *s = avctx->priv_data;
499  AVFrame pic = *pic_arg;
500  int i;
501 
502  //CODEC_FLAG_EMU_EDGE have to be cleared
504  return -1;
505 
506  //picture should be flipped upside-down
507  for(i=0; i < 3; i++) {
508  pic.data[i] += (pic.linesize[i] * (s->mjpeg_vsample[i] * (8 * s->mb_height -((s->height/V_MAX)&7)) - 1 ));
509  pic.linesize[i] *= -1;
510  }
511  return ff_MPV_encode_picture(avctx, pkt, &pic, got_packet);
512 }
513 
514 #if CONFIG_MJPEG_ENCODER
515 AVCodec ff_mjpeg_encoder = {
516  .name = "mjpeg",
517  .type = AVMEDIA_TYPE_VIDEO,
518  .id = AV_CODEC_ID_MJPEG,
519  .priv_data_size = sizeof(MpegEncContext),
521  .encode2 = ff_MPV_encode_picture,
524  .pix_fmts = (const enum AVPixelFormat[]){
526  },
527  .long_name = NULL_IF_CONFIG_SMALL("MJPEG (Motion JPEG)"),
528 };
529 #endif
530 #if CONFIG_AMV_ENCODER
531 AVCodec ff_amv_encoder = {
532  .name = "amv",
533  .type = AVMEDIA_TYPE_VIDEO,
534  .id = AV_CODEC_ID_AMV,
535  .priv_data_size = sizeof(MpegEncContext),
537  .encode2 = amv_encode_picture,
539  .pix_fmts = (const enum AVPixelFormat[]){
541  },
542  .long_name = NULL_IF_CONFIG_SMALL("AMV Video"),
543 };
544 #endif