| 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 */ |
| 37 | static 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 | |
| 57 | static 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 | |
| 114 | static 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 | |
| 156 | void 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 | |
| 182 | void 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 | |
| 270 | end: |
| 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 | |
| 281 | void 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 | |
| 340 | void 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 | |
| 356 | void 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 | |
| 363 | void 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 | } |