libavcodec/mjpegenc.c

   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 libavcodec/mjpegenc.c
  30  * MJPEG encoder.
  31  */
  32
  33 //#define DEBUG
  34 #include <assert.h>
  35
  36 #include "avcodec.h"
  37 #include "dsputil.h"
  38 #include "mpegvideo.h"
  39 #include "mjpeg.h"
  40 #include "mjpegenc.h"
  41
  42 /* use two quantizer tables (one for luminance and one for chrominance) */
  43 /* not yet working */
  44 #undef TWOMATRIXES
  45
  46
  47 av_cold int ff_mjpeg_encode_init(MpegEncContext *s)
  48 {
  49     MJpegContext *m;
  50
  51     m = av_malloc(sizeof(MJpegContext));
  52     if (!m)
  53         return -1;
  54
  55     s->min_qcoeff=-1023;
  56     s->max_qcoeff= 1023;
  57
  58     /* build all the huffman tables */
  59     ff_mjpeg_build_huffman_codes(m->huff_size_dc_luminance,
  60                                  m->huff_code_dc_luminance,
  61                                  ff_mjpeg_bits_dc_luminance,
  62                                  ff_mjpeg_val_dc);
  63     ff_mjpeg_build_huffman_codes(m->huff_size_dc_chrominance,
  64                                  m->huff_code_dc_chrominance,
  65                                  ff_mjpeg_bits_dc_chrominance,
  66                                  ff_mjpeg_val_dc);
  67     ff_mjpeg_build_huffman_codes(m->huff_size_ac_luminance,
  68                                  m->huff_code_ac_luminance,
  69                                  ff_mjpeg_bits_ac_luminance,
  70                                  ff_mjpeg_val_ac_luminance);
  71     ff_mjpeg_build_huffman_codes(m->huff_size_ac_chrominance,
  72                                  m->huff_code_ac_chrominance,
  73                                  ff_mjpeg_bits_ac_chrominance,
  74                                  ff_mjpeg_val_ac_chrominance);
  75
  76     s->mjpeg_ctx = m;
  77     return 0;
  78 }
  79
  80 void ff_mjpeg_encode_close(MpegEncContext *s)
  81 {
  82     av_free(s->mjpeg_ctx);
  83 }
  84
  85 /* table_class: 0 = DC coef, 1 = AC coefs */
  86 static int put_huffman_table(MpegEncContext *s, int table_class, int table_id,
  87                              const uint8_t *bits_table, const uint8_t *value_table)
  88 {
  89     PutBitContext *p = &s->pb;
  90     int n, i;
  91
  92     put_bits(p, 4, table_class);
  93     put_bits(p, 4, table_id);
  94
  95     n = 0;
  96     for(i=1;i<=16;i++) {
  97         n += bits_table[i];
  98         put_bits(p, 8, bits_table[i]);
  99     }
 100
 101     for(i=0;i<n;i++)
 102         put_bits(p, 8, value_table[i]);
 103
 104     return n + 17;
 105 }
 106
 107 static void jpeg_table_header(MpegEncContext *s)
 108 {
 109     PutBitContext *p = &s->pb;
 110     int i, j, size;
 111     uint8_t *ptr;
 112
 113     /* quant matrixes */
 114     put_marker(p, DQT);
 115 #ifdef TWOMATRIXES
 116     put_bits(p, 16, 2 + 2 * (1 + 64));
 117 #else
 118     put_bits(p, 16, 2 + 1 * (1 + 64));
 119 #endif
 120     put_bits(p, 4, 0); /* 8 bit precision */
 121     put_bits(p, 4, 0); /* table 0 */
 122     for(i=0;i<64;i++) {
 123         j = s->intra_scantable.permutated[i];
 124         put_bits(p, 8, s->intra_matrix[j]);
 125     }
 126 #ifdef TWOMATRIXES
 127     put_bits(p, 4, 0); /* 8 bit precision */
 128     put_bits(p, 4, 1); /* table 1 */
 129     for(i=0;i<64;i++) {
 130         j = s->intra_scantable.permutated[i];
 131         put_bits(p, 8, s->chroma_intra_matrix[j]);
 132     }
 133 #endif
 134
 135     /* huffman table */
 136     put_marker(p, DHT);
 137     flush_put_bits(p);
 138     ptr = put_bits_ptr(p);
 139     put_bits(p, 16, 0); /* patched later */
 140     size = 2;
 141     size += put_huffman_table(s, 0, 0, ff_mjpeg_bits_dc_luminance,
 142                               ff_mjpeg_val_dc);
 143     size += put_huffman_table(s, 0, 1, ff_mjpeg_bits_dc_chrominance,
 144                               ff_mjpeg_val_dc);
 145
 146     size += put_huffman_table(s, 1, 0, ff_mjpeg_bits_ac_luminance,
 147                               ff_mjpeg_val_ac_luminance);
 148     size += put_huffman_table(s, 1, 1, ff_mjpeg_bits_ac_chrominance,
 149                               ff_mjpeg_val_ac_chrominance);
 150     AV_WB16(ptr, size);
 151 }
 152
 153 static void jpeg_put_comments(MpegEncContext *s)
 154 {
 155     PutBitContext *p = &s->pb;
 156     int size;
 157     uint8_t *ptr;
 158
 159     if (s->aspect_ratio_info /* && !lossless */)
 160     {
 161     /* JFIF header */
 162     put_marker(p, APP0);
 163     put_bits(p, 16, 16);
 164     ff_put_string(p, "JFIF", 1); /* this puts the trailing zero-byte too */
 165     put_bits(p, 16, 0x0201); /* v 1.02 */
 166     put_bits(p, 8, 0); /* units type: 0 - aspect ratio */
 167     put_bits(p, 16, s->avctx->sample_aspect_ratio.num);
 168     put_bits(p, 16, s->avctx->sample_aspect_ratio.den);
 169     put_bits(p, 8, 0); /* thumbnail width */
 170     put_bits(p, 8, 0); /* thumbnail height */
 171     }
 172
 173     /* comment */
 174     if(!(s->flags & CODEC_FLAG_BITEXACT)){
 175         put_marker(p, COM);
 176         flush_put_bits(p);
 177         ptr = put_bits_ptr(p);
 178         put_bits(p, 16, 0); /* patched later */
 179         ff_put_string(p, LIBAVCODEC_IDENT, 1);
 180         size = strlen(LIBAVCODEC_IDENT)+3;
 181         AV_WB16(ptr, size);
 182     }
 183
 184     if(  s->avctx->pix_fmt == PIX_FMT_YUV420P
 185        ||s->avctx->pix_fmt == PIX_FMT_YUV422P
 186        ||s->avctx->pix_fmt == PIX_FMT_YUV444P){
 187         put_marker(p, COM);
 188         flush_put_bits(p);
 189         ptr = put_bits_ptr(p);
 190         put_bits(p, 16, 0); /* patched later */
 191         ff_put_string(p, "CS=ITU601", 1);
 192         size = strlen("CS=ITU601")+3;
 193         AV_WB16(ptr, size);
 194     }
 195 }
 196
 197 void ff_mjpeg_encode_picture_header(MpegEncContext *s)
 198 {
 199     const int lossless= s->avctx->codec_id != CODEC_ID_MJPEG;
 200
 201     put_marker(&s->pb, SOI);
 202
 203     jpeg_put_comments(s);
 204
 205     jpeg_table_header(s);
 206
 207     switch(s->avctx->codec_id){
 208     case CODEC_ID_MJPEG:  put_marker(&s->pb, SOF0 ); break;
 209     case CODEC_ID_LJPEG:  put_marker(&s->pb, SOF3 ); break;
 210     default: assert(0);
 211     }
 212
 213     put_bits(&s->pb, 16, 17);
 214     if(lossless && s->avctx->pix_fmt == PIX_FMT_RGB32)
 215         put_bits(&s->pb, 8, 9); /* 9 bits/component RCT */
 216     else
 217         put_bits(&s->pb, 8, 8); /* 8 bits/component */
 218     put_bits(&s->pb, 16, s->height);
 219     put_bits(&s->pb, 16, s->width);
 220     put_bits(&s->pb, 8, 3); /* 3 components */
 221
 222     /* Y component */
 223     put_bits(&s->pb, 8, 1); /* component number */
 224     put_bits(&s->pb, 4, s->mjpeg_hsample[0]); /* H factor */
 225     put_bits(&s->pb, 4, s->mjpeg_vsample[0]); /* V factor */
 226     put_bits(&s->pb, 8, 0); /* select matrix */
 227
 228     /* Cb component */
 229     put_bits(&s->pb, 8, 2); /* component number */
 230     put_bits(&s->pb, 4, s->mjpeg_hsample[1]); /* H factor */
 231     put_bits(&s->pb, 4, s->mjpeg_vsample[1]); /* V factor */
 232 #ifdef TWOMATRIXES
 233     put_bits(&s->pb, 8, lossless ? 0 : 1); /* select matrix */
 234 #else
 235     put_bits(&s->pb, 8, 0); /* select matrix */
 236 #endif
 237
 238     /* Cr component */
 239     put_bits(&s->pb, 8, 3); /* component number */
 240     put_bits(&s->pb, 4, s->mjpeg_hsample[2]); /* H factor */
 241     put_bits(&s->pb, 4, s->mjpeg_vsample[2]); /* V factor */
 242 #ifdef TWOMATRIXES
 243     put_bits(&s->pb, 8, lossless ? 0 : 1); /* select matrix */
 244 #else
 245     put_bits(&s->pb, 8, 0); /* select matrix */
 246 #endif
 247
 248     /* scan header */
 249     put_marker(&s->pb, SOS);
 250     put_bits(&s->pb, 16, 12); /* length */
 251     put_bits(&s->pb, 8, 3); /* 3 components */
 252
 253     /* Y component */
 254     put_bits(&s->pb, 8, 1); /* index */
 255     put_bits(&s->pb, 4, 0); /* DC huffman table index */
 256     put_bits(&s->pb, 4, 0); /* AC huffman table index */
 257
 258     /* Cb component */
 259     put_bits(&s->pb, 8, 2); /* index */
 260     put_bits(&s->pb, 4, 1); /* DC huffman table index */
 261     put_bits(&s->pb, 4, lossless ? 0 : 1); /* AC huffman table index */
 262
 263     /* Cr component */
 264     put_bits(&s->pb, 8, 3); /* index */
 265     put_bits(&s->pb, 4, 1); /* DC huffman table index */
 266     put_bits(&s->pb, 4, lossless ? 0 : 1); /* AC huffman table index */
 267
 268     put_bits(&s->pb, 8, lossless ? s->avctx->prediction_method+1 : 0); /* Ss (not used) */
 269
 270     switch(s->avctx->codec_id){
 271     case CODEC_ID_MJPEG:  put_bits(&s->pb, 8, 63); break; /* Se (not used) */
 272     case CODEC_ID_LJPEG:  put_bits(&s->pb, 8,  0); break; /* not used */
 273     default: assert(0);
 274     }
 275
 276     put_bits(&s->pb, 8, 0); /* Ah/Al (not used) */
 277 }
 278
 279 static void escape_FF(MpegEncContext *s, int start)
 280 {
 281     int size= put_bits_count(&s->pb) - start*8;
 282     int i, ff_count;
 283     uint8_t *buf= s->pb.buf + start;
 284     int align= (-(size_t)(buf))&3;
 285
 286     assert((size&7) == 0);
 287     size >>= 3;
 288
 289     ff_count=0;
 290     for(i=0; i<size && i<align; i++){
 291         if(buf[i]==0xFF) ff_count++;
 292     }
 293     for(; i<size-15; i+=16){
 294         int acc, v;
 295
 296         v= *(uint32_t*)(&buf[i]);
 297         acc= (((v & (v>>4))&0x0F0F0F0F)+0x01010101)&0x10101010;
 298         v= *(uint32_t*)(&buf[i+4]);
 299         acc+=(((v & (v>>4))&0x0F0F0F0F)+0x01010101)&0x10101010;
 300         v= *(uint32_t*)(&buf[i+8]);
 301         acc+=(((v & (v>>4))&0x0F0F0F0F)+0x01010101)&0x10101010;
 302         v= *(uint32_t*)(&buf[i+12]);
 303         acc+=(((v & (v>>4))&0x0F0F0F0F)+0x01010101)&0x10101010;
 304
 305         acc>>=4;
 306         acc+= (acc>>16);
 307         acc+= (acc>>8);
 308         ff_count+= acc&0xFF;
 309     }
 310     for(; i<size; i++){
 311         if(buf[i]==0xFF) ff_count++;
 312     }
 313
 314     if(ff_count==0) return;
 315
 316     /* skip put bits */
 317     for(i=0; i<ff_count-3; i+=4)
 318         put_bits(&s->pb, 32, 0);
 319     put_bits(&s->pb, (ff_count-i)*8, 0);
 320     flush_put_bits(&s->pb);
 321
 322     for(i=size-1; ff_count; i--){
 323         int v= buf[i];
 324
 325         if(v==0xFF){
 326 //printf("%d %d\n", i, ff_count);
 327             buf[i+ff_count]= 0;
 328             ff_count--;
 329         }
 330
 331         buf[i+ff_count]= v;
 332     }
 333 }
 334
 335 void ff_mjpeg_encode_stuffing(PutBitContext * pbc)
 336 {
 337     int length;
 338     length= (-put_bits_count(pbc))&7;
 339     if(length) put_bits(pbc, length, (1<<length)-1);
 340 }
 341
 342 void ff_mjpeg_encode_picture_trailer(MpegEncContext *s)
 343 {
 344     ff_mjpeg_encode_stuffing(&s->pb);
 345     flush_put_bits(&s->pb);
 346
 347     assert((s->header_bits&7)==0);
 348
 349     escape_FF(s, s->header_bits>>3);
 350
 351     put_marker(&s->pb, EOI);
 352 }
 353
 354 void ff_mjpeg_encode_dc(MpegEncContext *s, int val,
 355                         uint8_t *huff_size, uint16_t *huff_code)
 356 {
 357     int mant, nbits;
 358
 359     if (val == 0) {
 360         put_bits(&s->pb, huff_size[0], huff_code[0]);
 361     } else {
 362         mant = val;
 363         if (val < 0) {
 364             val = -val;
 365             mant--;
 366         }
 367
 368         nbits= av_log2_16bit(val) + 1;
 369
 370         put_bits(&s->pb, huff_size[nbits], huff_code[nbits]);
 371
 372         put_sbits(&s->pb, nbits, mant);
 373     }
 374 }
 375
 376 static void encode_block(MpegEncContext *s, DCTELEM *block, int n)
 377 {
 378     int mant, nbits, code, i, j;
 379     int component, dc, run, last_index, val;
 380     MJpegContext *m = s->mjpeg_ctx;
 381     uint8_t *huff_size_ac;
 382     uint16_t *huff_code_ac;
 383
 384     /* DC coef */
 385     component = (n <= 3 ? 0 : (n&1) + 1);
 386     dc = block[0]; /* overflow is impossible */
 387     val = dc - s->last_dc[component];
 388     if (n < 4) {
 389         ff_mjpeg_encode_dc(s, val, m->huff_size_dc_luminance, m->huff_code_dc_luminance);
 390         huff_size_ac = m->huff_size_ac_luminance;
 391         huff_code_ac = m->huff_code_ac_luminance;
 392     } else {
 393         ff_mjpeg_encode_dc(s, val, m->huff_size_dc_chrominance, m->huff_code_dc_chrominance);
 394         huff_size_ac = m->huff_size_ac_chrominance;
 395         huff_code_ac = m->huff_code_ac_chrominance;
 396     }
 397     s->last_dc[component] = dc;
 398
 399     /* AC coefs */
 400
 401     run = 0;
 402     last_index = s->block_last_index[n];
 403     for(i=1;i<=last_index;i++) {
 404         j = s->intra_scantable.permutated[i];
 405         val = block[j];
 406         if (val == 0) {
 407             run++;
 408         } else {
 409             while (run >= 16) {
 410                 put_bits(&s->pb, huff_size_ac[0xf0], huff_code_ac[0xf0]);
 411                 run -= 16;
 412             }
 413             mant = val;
 414             if (val < 0) {
 415                 val = -val;
 416                 mant--;
 417             }
 418
 419             nbits= av_log2(val) + 1;
 420             code = (run << 4) | nbits;
 421
 422             put_bits(&s->pb, huff_size_ac[code], huff_code_ac[code]);
 423
 424             put_sbits(&s->pb, nbits, mant);
 425             run = 0;
 426         }
 427     }
 428
 429     /* output EOB only if not already 64 values */
 430     if (last_index < 63 || run != 0)
 431         put_bits(&s->pb, huff_size_ac[0], huff_code_ac[0]);
 432 }
 433
 434 void ff_mjpeg_encode_mb(MpegEncContext *s, DCTELEM block[6][64])
 435 {
 436     int i;
 437     for(i=0;i<5;i++) {
 438         encode_block(s, block[i], i);
 439     }
 440     if (s->chroma_format == CHROMA_420) {
 441         encode_block(s, block[5], 5);
 442     } else {
 443         encode_block(s, block[6], 6);
 444         encode_block(s, block[5], 5);
 445         encode_block(s, block[7], 7);
 446     }
 447 }
 448
 449 AVCodec mjpeg_encoder = {
 450     "mjpeg",
 451     CODEC_TYPE_VIDEO,
 452     CODEC_ID_MJPEG,
 453     sizeof(MpegEncContext),
 454     MPV_encode_init,
 455     MPV_encode_picture,
 456     MPV_encode_end,
 457     .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUVJ420P, PIX_FMT_YUVJ422P, PIX_FMT_NONE},
 458     .long_name= NULL_IF_CONFIG_SMALL("MJPEG (Motion JPEG)"),
 459 };