1/* 2 * lossless JPEG shared bits 3 * Copyright (c) 2000, 2001 Fabrice Bellard 4 * Copyright (c) 2003 Alex Beregszaszi 5 * 6 * This file is part of FFmpeg. 7 * 8 * FFmpeg is free software; you can redistribute it and/or 9 * modify it under the terms of the GNU Lesser General Public 10 * License as published by the Free Software Foundation; either 11 * version 2.1 of the License, or (at your option) any later version. 12 * 13 * FFmpeg is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 16 * Lesser General Public License for more details. 17 * 18 * You should have received a copy of the GNU Lesser General Public 19 * License along with FFmpeg; if not, write to the Free Software 20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 21 */ 22 23#include <stdint.h> 24#include <string.h> 25 26#include "libavutil/common.h" 27#include "libavutil/pixdesc.h" 28#include "libavutil/pixfmt.h" 29 30#include "avcodec.h" 31#include "idctdsp.h" 32#include "put_bits.h" 33#include "mjpegenc_common.h" 34#include "mjpeg.h" 35 36/* table_class: 0 = DC coef, 1 = AC coefs */ 37static int put_huffman_table(PutBitContext *p, int table_class, int table_id, 38 const uint8_t *bits_table, const uint8_t *value_table) 39{ 40 int n, i; 41 42 put_bits(p, 4, table_class); 43 put_bits(p, 4, table_id); 44 45 n = 0; 46 for(i=1;i<=16;i++) { 47 n += bits_table[i]; 48 put_bits(p, 8, bits_table[i]); 49 } 50 51 for(i=0;i<n;i++) 52 put_bits(p, 8, value_table[i]); 53 54 return n + 17; 55} 56 57static void jpeg_table_header(AVCodecContext *avctx, PutBitContext *p, 58 ScanTable *intra_scantable, 59 uint16_t luma_intra_matrix[64], 60 uint16_t chroma_intra_matrix[64], 61 int hsample[3]) 62{ 63 int i, j, size; 64 uint8_t *ptr; 65 66 if (avctx->codec_id != AV_CODEC_ID_LJPEG) { 67 int matrix_count = 1 + !!memcmp(luma_intra_matrix, 68 chroma_intra_matrix, 69 sizeof(luma_intra_matrix[0]) * 64); 70 /* quant matrixes */ 71 put_marker(p, DQT); 72 put_bits(p, 16, 2 + matrix_count * (1 + 64)); 73 put_bits(p, 4, 0); /* 8 bit precision */ 74 put_bits(p, 4, 0); /* table 0 */ 75 for(i=0;i<64;i++) { 76 j = intra_scantable->permutated[i]; 77 put_bits(p, 8, luma_intra_matrix[j]); 78 } 79 80 if (matrix_count > 1) { 81 put_bits(p, 4, 0); /* 8 bit precision */ 82 put_bits(p, 4, 1); /* table 1 */ 83 for(i=0;i<64;i++) { 84 j = intra_scantable->permutated[i]; 85 put_bits(p, 8, chroma_intra_matrix[j]); 86 } 87 } 88 } 89 90 if(avctx->active_thread_type & FF_THREAD_SLICE){ 91 put_marker(p, DRI); 92 put_bits(p, 16, 4); 93 put_bits(p, 16, (avctx->width-1)/(8*hsample[0]) + 1); 94 } 95 96 /* huffman table */ 97 put_marker(p, DHT); 98 flush_put_bits(p); 99 ptr = put_bits_ptr(p); 100 put_bits(p, 16, 0); /* patched later */ 101 size = 2; 102 size += put_huffman_table(p, 0, 0, avpriv_mjpeg_bits_dc_luminance, 103 avpriv_mjpeg_val_dc); 104 size += put_huffman_table(p, 0, 1, avpriv_mjpeg_bits_dc_chrominance, 105 avpriv_mjpeg_val_dc); 106 107 size += put_huffman_table(p, 1, 0, avpriv_mjpeg_bits_ac_luminance, 108 avpriv_mjpeg_val_ac_luminance); 109 size += put_huffman_table(p, 1, 1, avpriv_mjpeg_bits_ac_chrominance, 110 avpriv_mjpeg_val_ac_chrominance); 111 AV_WB16(ptr, size); 112} 113 114static void jpeg_put_comments(AVCodecContext *avctx, PutBitContext *p) 115{ 116 int size; 117 uint8_t *ptr; 118 119 if (avctx->sample_aspect_ratio.num > 0 && avctx->sample_aspect_ratio.den > 0) { 120 /* JFIF header */ 121 put_marker(p, APP0); 122 put_bits(p, 16, 16); 123 avpriv_put_string(p, "JFIF", 1); /* this puts the trailing zero-byte too */ 124 put_bits(p, 16, 0x0102); /* v 1.02 */ 125 put_bits(p, 8, 0); /* units type: 0 - aspect ratio */ 126 put_bits(p, 16, avctx->sample_aspect_ratio.num); 127 put_bits(p, 16, avctx->sample_aspect_ratio.den); 128 put_bits(p, 8, 0); /* thumbnail width */ 129 put_bits(p, 8, 0); /* thumbnail height */ 130 } 131 132 /* comment */ 133 if (!(avctx->flags & CODEC_FLAG_BITEXACT)) { 134 put_marker(p, COM); 135 flush_put_bits(p); 136 ptr = put_bits_ptr(p); 137 put_bits(p, 16, 0); /* patched later */ 138 avpriv_put_string(p, LIBAVCODEC_IDENT, 1); 139 size = strlen(LIBAVCODEC_IDENT)+3; 140 AV_WB16(ptr, size); 141 } 142 143 if (avctx->pix_fmt == AV_PIX_FMT_YUV420P || 144 avctx->pix_fmt == AV_PIX_FMT_YUV422P || 145 avctx->pix_fmt == AV_PIX_FMT_YUV444P) { 146 put_marker(p, COM); 147 flush_put_bits(p); 148 ptr = put_bits_ptr(p); 149 put_bits(p, 16, 0); /* patched later */ 150 avpriv_put_string(p, "CS=ITU601", 1); 151 size = strlen("CS=ITU601")+3; 152 AV_WB16(ptr, size); 153 } 154} 155 156void ff_mjpeg_init_hvsample(AVCodecContext *avctx, int hsample[3], int vsample[3]) 157{ 158 int chroma_h_shift, chroma_v_shift; 159 160 av_pix_fmt_get_chroma_sub_sample(avctx->pix_fmt, &chroma_h_shift, 161 &chroma_v_shift); 162 if (avctx->codec->id == AV_CODEC_ID_LJPEG && 163 ( avctx->pix_fmt == AV_PIX_FMT_BGR0 164 || avctx->pix_fmt == AV_PIX_FMT_BGRA 165 || avctx->pix_fmt == AV_PIX_FMT_BGR24)) { 166 vsample[0] = hsample[0] = 167 vsample[1] = hsample[1] = 168 vsample[2] = hsample[2] = 1; 169 } else if (avctx->pix_fmt == AV_PIX_FMT_YUV444P || avctx->pix_fmt == AV_PIX_FMT_YUVJ444P) { 170 vsample[0] = vsample[1] = vsample[2] = 2; 171 hsample[0] = hsample[1] = hsample[2] = 1; 172 } else { 173 vsample[0] = 2; 174 vsample[1] = 2 >> chroma_v_shift; 175 vsample[2] = 2 >> chroma_v_shift; 176 hsample[0] = 2; 177 hsample[1] = 2 >> chroma_h_shift; 178 hsample[2] = 2 >> chroma_h_shift; 179 } 180} 181 182void ff_mjpeg_encode_picture_header(AVCodecContext *avctx, PutBitContext *pb, 183 ScanTable *intra_scantable, 184 uint16_t luma_intra_matrix[64], 185 uint16_t chroma_intra_matrix[64]) 186{ 187 const int lossless = avctx->codec_id != AV_CODEC_ID_MJPEG && avctx->codec_id != AV_CODEC_ID_AMV; 188 int hsample[3], vsample[3]; 189 int i; 190 int chroma_matrix = !!memcmp(luma_intra_matrix, 191 chroma_intra_matrix, 192 sizeof(luma_intra_matrix[0])*64); 193 194 ff_mjpeg_init_hvsample(avctx, hsample, vsample); 195 196 put_marker(pb, SOI); 197 198 // hack for AMV mjpeg format 199 if(avctx->codec_id == AV_CODEC_ID_AMV) goto end; 200 201 jpeg_put_comments(avctx, pb); 202 203 jpeg_table_header(avctx, pb, intra_scantable, luma_intra_matrix, chroma_intra_matrix, hsample); 204 205 switch (avctx->codec_id) { 206 case AV_CODEC_ID_MJPEG: put_marker(pb, SOF0 ); break; 207 case AV_CODEC_ID_LJPEG: put_marker(pb, SOF3 ); break; 208 default: av_assert0(0); 209 } 210 211 put_bits(pb, 16, 17); 212 if (lossless && ( avctx->pix_fmt == AV_PIX_FMT_BGR0 213 || avctx->pix_fmt == AV_PIX_FMT_BGRA 214 || avctx->pix_fmt == AV_PIX_FMT_BGR24)) 215 put_bits(pb, 8, 9); /* 9 bits/component RCT */ 216 else 217 put_bits(pb, 8, 8); /* 8 bits/component */ 218 put_bits(pb, 16, avctx->height); 219 put_bits(pb, 16, avctx->width); 220 put_bits(pb, 8, 3); /* 3 components */ 221 222 /* Y component */ 223 put_bits(pb, 8, 1); /* component number */ 224 put_bits(pb, 4, hsample[0]); /* H factor */ 225 put_bits(pb, 4, vsample[0]); /* V factor */ 226 put_bits(pb, 8, 0); /* select matrix */ 227 228 /* Cb component */ 229 put_bits(pb, 8, 2); /* component number */ 230 put_bits(pb, 4, hsample[1]); /* H factor */ 231 put_bits(pb, 4, vsample[1]); /* V factor */ 232 put_bits(pb, 8, lossless ? 0 : chroma_matrix); /* select matrix */ 233 234 /* Cr component */ 235 put_bits(pb, 8, 3); /* component number */ 236 put_bits(pb, 4, hsample[2]); /* H factor */ 237 put_bits(pb, 4, vsample[2]); /* V factor */ 238 put_bits(pb, 8, lossless ? 0 : chroma_matrix); /* select matrix */ 239 240 /* scan header */ 241 put_marker(pb, SOS); 242 put_bits(pb, 16, 12); /* length */ 243 put_bits(pb, 8, 3); /* 3 components */ 244 245 /* Y component */ 246 put_bits(pb, 8, 1); /* index */ 247 put_bits(pb, 4, 0); /* DC huffman table index */ 248 put_bits(pb, 4, 0); /* AC huffman table index */ 249 250 /* Cb component */ 251 put_bits(pb, 8, 2); /* index */ 252 put_bits(pb, 4, 1); /* DC huffman table index */ 253 put_bits(pb, 4, lossless ? 0 : 1); /* AC huffman table index */ 254 255 /* Cr component */ 256 put_bits(pb, 8, 3); /* index */ 257 put_bits(pb, 4, 1); /* DC huffman table index */ 258 put_bits(pb, 4, lossless ? 0 : 1); /* AC huffman table index */ 259 260 put_bits(pb, 8, lossless ? avctx->prediction_method + 1 : 0); /* Ss (not used) */ 261 262 switch (avctx->codec_id) { 263 case AV_CODEC_ID_MJPEG: put_bits(pb, 8, 63); break; /* Se (not used) */ 264 case AV_CODEC_ID_LJPEG: put_bits(pb, 8, 0); break; /* not used */ 265 default: av_assert0(0); 266 } 267 268 put_bits(pb, 8, 0); /* Ah/Al (not used) */ 269 270end: 271 if (!lossless) { 272 MpegEncContext *s = avctx->priv_data; 273 av_assert0(avctx->codec->priv_data_size == sizeof(MpegEncContext)); 274 275 s->esc_pos = put_bits_count(pb) >> 3; 276 for(i=1; i<s->slice_context_count; i++) 277 s->thread_context[i]->esc_pos = 0; 278 } 279} 280 281void ff_mjpeg_escape_FF(PutBitContext *pb, int start) 282{ 283 int size; 284 int i, ff_count; 285 uint8_t *buf = pb->buf + start; 286 int align= (-(size_t)(buf))&3; 287 int pad = (-put_bits_count(pb))&7; 288 289 if (pad) 290 put_bits(pb, pad, (1<<pad)-1); 291 292 flush_put_bits(pb); 293 size = put_bits_count(pb) - start * 8; 294 295 av_assert1((size&7) == 0); 296 size >>= 3; 297 298 ff_count=0; 299 for(i=0; i<size && i<align; i++){ 300 if(buf[i]==0xFF) ff_count++; 301 } 302 for(; i<size-15; i+=16){ 303 int acc, v; 304 305 v= *(uint32_t*)(&buf[i]); 306 acc= (((v & (v>>4))&0x0F0F0F0F)+0x01010101)&0x10101010; 307 v= *(uint32_t*)(&buf[i+4]); 308 acc+=(((v & (v>>4))&0x0F0F0F0F)+0x01010101)&0x10101010; 309 v= *(uint32_t*)(&buf[i+8]); 310 acc+=(((v & (v>>4))&0x0F0F0F0F)+0x01010101)&0x10101010; 311 v= *(uint32_t*)(&buf[i+12]); 312 acc+=(((v & (v>>4))&0x0F0F0F0F)+0x01010101)&0x10101010; 313 314 acc>>=4; 315 acc+= (acc>>16); 316 acc+= (acc>>8); 317 ff_count+= acc&0xFF; 318 } 319 for(; i<size; i++){ 320 if(buf[i]==0xFF) ff_count++; 321 } 322 323 if(ff_count==0) return; 324 325 flush_put_bits(pb); 326 skip_put_bytes(pb, ff_count); 327 328 for(i=size-1; ff_count; i--){ 329 int v= buf[i]; 330 331 if(v==0xFF){ 332 buf[i+ff_count]= 0; 333 ff_count--; 334 } 335 336 buf[i+ff_count]= v; 337 } 338} 339 340void ff_mjpeg_encode_stuffing(MpegEncContext *s) 341{ 342 int i; 343 PutBitContext *pbc = &s->pb; 344 int mb_y = s->mb_y - !s->mb_x; 345 346 ff_mjpeg_escape_FF(pbc, s->esc_pos); 347 348 if((s->avctx->active_thread_type & FF_THREAD_SLICE) && mb_y < s->mb_height) 349 put_marker(pbc, RST0 + (mb_y&7)); 350 s->esc_pos = put_bits_count(pbc) >> 3; 351 352 for(i=0; i<3; i++) 353 s->last_dc[i] = 128 << s->intra_dc_precision; 354} 355 356void ff_mjpeg_encode_picture_trailer(PutBitContext *pb, int header_bits) 357{ 358 av_assert1((header_bits & 7) == 0); 359 360 put_marker(pb, EOI); 361} 362 363void ff_mjpeg_encode_dc(PutBitContext *pb, int val, 364 uint8_t *huff_size, uint16_t *huff_code) 365{ 366 int mant, nbits; 367 368 if (val == 0) { 369 put_bits(pb, huff_size[0], huff_code[0]); 370 } else { 371 mant = val; 372 if (val < 0) { 373 val = -val; 374 mant--; 375 } 376 377 nbits= av_log2_16bit(val) + 1; 378 379 put_bits(pb, huff_size[nbits], huff_code[nbits]); 380 381 put_sbits(pb, nbits, mant); 382 } 383} 384