2 * MJPEG encoder and decoder
3 * Copyright (c) 2000, 2001 Fabrice Bellard.
4 * Copyright (c) 2003 Alex Beregszaszi
5 * Copyright (c) 2003-2004 Michael Niedermayer
7 * This file is part of FFmpeg.
9 * FFmpeg is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU Lesser General Public
11 * License as published by the Free Software Foundation; either
12 * version 2.1 of the License, or (at your option) any later version.
14 * FFmpeg is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * Lesser General Public License for more details.
19 * You should have received a copy of the GNU Lesser General Public
20 * License along with FFmpeg; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 * Support for external huffman table, various fixes (AVID workaround),
24 * aspecting, new decode_frame mechanism and apple mjpeg-b support
30 * MJPEG encoder and decoder.
38 #include "mpegvideo.h"
39 #include "bytestream.h"
41 /* use two quantizer tables (one for luminance and one for chrominance) */
45 typedef struct MJpegContext {
46 uint8_t huff_size_dc_luminance[12]; //FIXME use array [3] instead of lumi / chrom, for easier addressing
47 uint16_t huff_code_dc_luminance[12];
48 uint8_t huff_size_dc_chrominance[12];
49 uint16_t huff_code_dc_chrominance[12];
51 uint8_t huff_size_ac_luminance[256];
52 uint16_t huff_code_ac_luminance[256];
53 uint8_t huff_size_ac_chrominance[256];
54 uint16_t huff_code_ac_chrominance[256];
57 /* JPEG marker codes */
60 SOF0 = 0xc0, /* baseline */
61 SOF1 = 0xc1, /* extended sequential, huffman */
62 SOF2 = 0xc2, /* progressive, huffman */
63 SOF3 = 0xc3, /* lossless, huffman */
65 SOF5 = 0xc5, /* differential sequential, huffman */
66 SOF6 = 0xc6, /* differential progressive, huffman */
67 SOF7 = 0xc7, /* differential lossless, huffman */
68 JPG = 0xc8, /* reserved for JPEG extension */
69 SOF9 = 0xc9, /* extended sequential, arithmetic */
70 SOF10 = 0xca, /* progressive, arithmetic */
71 SOF11 = 0xcb, /* lossless, arithmetic */
73 SOF13 = 0xcd, /* differential sequential, arithmetic */
74 SOF14 = 0xce, /* differential progressive, arithmetic */
75 SOF15 = 0xcf, /* differential lossless, arithmetic */
77 DHT = 0xc4, /* define huffman tables */
79 DAC = 0xcc, /* define arithmetic-coding conditioning */
81 /* restart with modulo 8 count "m" */
91 SOI = 0xd8, /* start of image */
92 EOI = 0xd9, /* end of image */
93 SOS = 0xda, /* start of scan */
94 DQT = 0xdb, /* define quantization tables */
95 DNL = 0xdc, /* define number of lines */
96 DRI = 0xdd, /* define restart interval */
97 DHP = 0xde, /* define hierarchical progression */
98 EXP = 0xdf, /* expand reference components */
124 SOF48 = 0xf7, ///< JPEG-LS
125 LSE = 0xf8, ///< JPEG-LS extension parameters
132 COM = 0xfe, /* comment */
134 TEM = 0x01, /* temporary private use for arithmetic coding */
136 /* 0x02 -> 0xbf reserved */
140 /* These are the sample quantization tables given in JPEG spec section K.1.
141 * The spec says that the values given produce "good" quality, and
142 * when divided by 2, "very good" quality.
144 static const unsigned char std_luminance_quant_tbl[64] = {
145 16, 11, 10, 16, 24, 40, 51, 61,
146 12, 12, 14, 19, 26, 58, 60, 55,
147 14, 13, 16, 24, 40, 57, 69, 56,
148 14, 17, 22, 29, 51, 87, 80, 62,
149 18, 22, 37, 56, 68, 109, 103, 77,
150 24, 35, 55, 64, 81, 104, 113, 92,
151 49, 64, 78, 87, 103, 121, 120, 101,
152 72, 92, 95, 98, 112, 100, 103, 99
154 static const unsigned char std_chrominance_quant_tbl[64] = {
155 17, 18, 24, 47, 99, 99, 99, 99,
156 18, 21, 26, 66, 99, 99, 99, 99,
157 24, 26, 56, 99, 99, 99, 99, 99,
158 47, 66, 99, 99, 99, 99, 99, 99,
159 99, 99, 99, 99, 99, 99, 99, 99,
160 99, 99, 99, 99, 99, 99, 99, 99,
161 99, 99, 99, 99, 99, 99, 99, 99,
162 99, 99, 99, 99, 99, 99, 99, 99
166 /* Set up the standard Huffman tables (cf. JPEG standard section K.3) */
167 /* IMPORTANT: these are only valid for 8-bit data precision! */
168 static const uint8_t bits_dc_luminance[17] =
169 { /* 0-base */ 0, 0, 1, 5, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0 };
170 static const uint8_t val_dc_luminance[] =
171 { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 };
173 static const uint8_t bits_dc_chrominance[17] =
174 { /* 0-base */ 0, 0, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0 };
175 static const uint8_t val_dc_chrominance[] =
176 { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 };
178 static const uint8_t bits_ac_luminance[17] =
179 { /* 0-base */ 0, 0, 2, 1, 3, 3, 2, 4, 3, 5, 5, 4, 4, 0, 0, 1, 0x7d };
180 static const uint8_t val_ac_luminance[] =
181 { 0x01, 0x02, 0x03, 0x00, 0x04, 0x11, 0x05, 0x12,
182 0x21, 0x31, 0x41, 0x06, 0x13, 0x51, 0x61, 0x07,
183 0x22, 0x71, 0x14, 0x32, 0x81, 0x91, 0xa1, 0x08,
184 0x23, 0x42, 0xb1, 0xc1, 0x15, 0x52, 0xd1, 0xf0,
185 0x24, 0x33, 0x62, 0x72, 0x82, 0x09, 0x0a, 0x16,
186 0x17, 0x18, 0x19, 0x1a, 0x25, 0x26, 0x27, 0x28,
187 0x29, 0x2a, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39,
188 0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49,
189 0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59,
190 0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69,
191 0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79,
192 0x7a, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89,
193 0x8a, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98,
194 0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7,
195 0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6,
196 0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3, 0xc4, 0xc5,
197 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2, 0xd3, 0xd4,
198 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xe1, 0xe2,
199 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea,
200 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8,
204 static const uint8_t bits_ac_chrominance[17] =
205 { /* 0-base */ 0, 0, 2, 1, 2, 4, 4, 3, 4, 7, 5, 4, 4, 0, 1, 2, 0x77 };
207 static const uint8_t val_ac_chrominance[] =
208 { 0x00, 0x01, 0x02, 0x03, 0x11, 0x04, 0x05, 0x21,
209 0x31, 0x06, 0x12, 0x41, 0x51, 0x07, 0x61, 0x71,
210 0x13, 0x22, 0x32, 0x81, 0x08, 0x14, 0x42, 0x91,
211 0xa1, 0xb1, 0xc1, 0x09, 0x23, 0x33, 0x52, 0xf0,
212 0x15, 0x62, 0x72, 0xd1, 0x0a, 0x16, 0x24, 0x34,
213 0xe1, 0x25, 0xf1, 0x17, 0x18, 0x19, 0x1a, 0x26,
214 0x27, 0x28, 0x29, 0x2a, 0x35, 0x36, 0x37, 0x38,
215 0x39, 0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48,
216 0x49, 0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58,
217 0x59, 0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68,
218 0x69, 0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78,
219 0x79, 0x7a, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
220 0x88, 0x89, 0x8a, 0x92, 0x93, 0x94, 0x95, 0x96,
221 0x97, 0x98, 0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5,
222 0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4,
223 0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3,
224 0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2,
225 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda,
226 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9,
227 0xea, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8,
231 /* isn't this function nicer than the one in the libjpeg ? */
232 static void build_huffman_codes(uint8_t *huff_size, uint16_t *huff_code,
233 const uint8_t *bits_table, const uint8_t *val_table)
235 int i, j, k,nb, code, sym;
242 sym = val_table[k++];
244 huff_code[sym] = code;
251 #ifdef CONFIG_ENCODERS
252 int mjpeg_init(MpegEncContext *s)
256 m = av_malloc(sizeof(MJpegContext));
263 /* build all the huffman tables */
264 build_huffman_codes(m->huff_size_dc_luminance,
265 m->huff_code_dc_luminance,
268 build_huffman_codes(m->huff_size_dc_chrominance,
269 m->huff_code_dc_chrominance,
272 build_huffman_codes(m->huff_size_ac_luminance,
273 m->huff_code_ac_luminance,
276 build_huffman_codes(m->huff_size_ac_chrominance,
277 m->huff_code_ac_chrominance,
285 void mjpeg_close(MpegEncContext *s)
287 av_free(s->mjpeg_ctx);
289 #endif //CONFIG_ENCODERS
291 #define PREDICT(ret, topleft, top, left, predictor)\
293 case 1: ret= left; break;\
294 case 2: ret= top; break;\
295 case 3: ret= topleft; break;\
296 case 4: ret= left + top - topleft; break;\
297 case 5: ret= left + ((top - topleft)>>1); break;\
298 case 6: ret= top + ((left - topleft)>>1); break;\
300 case 7: ret= (left + top)>>1; break;\
303 #ifdef CONFIG_ENCODERS
304 static inline void put_marker(PutBitContext *p, int code)
306 put_bits(p, 8, 0xff);
307 put_bits(p, 8, code);
310 /* table_class: 0 = DC coef, 1 = AC coefs */
311 static int put_huffman_table(MpegEncContext *s, int table_class, int table_id,
312 const uint8_t *bits_table, const uint8_t *value_table)
314 PutBitContext *p = &s->pb;
317 put_bits(p, 4, table_class);
318 put_bits(p, 4, table_id);
323 put_bits(p, 8, bits_table[i]);
327 put_bits(p, 8, value_table[i]);
332 static void jpeg_table_header(MpegEncContext *s)
334 PutBitContext *p = &s->pb;
341 put_bits(p, 16, 2 + 2 * (1 + 64));
343 put_bits(p, 16, 2 + 1 * (1 + 64));
345 put_bits(p, 4, 0); /* 8 bit precision */
346 put_bits(p, 4, 0); /* table 0 */
348 j = s->intra_scantable.permutated[i];
349 put_bits(p, 8, s->intra_matrix[j]);
352 put_bits(p, 4, 0); /* 8 bit precision */
353 put_bits(p, 4, 1); /* table 1 */
355 j = s->intra_scantable.permutated[i];
356 put_bits(p, 8, s->chroma_intra_matrix[j]);
364 put_bits(p, 16, 0); /* patched later */
366 size += put_huffman_table(s, 0, 0, bits_dc_luminance, val_dc_luminance);
367 size += put_huffman_table(s, 0, 1, bits_dc_chrominance, val_dc_chrominance);
369 size += put_huffman_table(s, 1, 0, bits_ac_luminance, val_ac_luminance);
370 size += put_huffman_table(s, 1, 1, bits_ac_chrominance, val_ac_chrominance);
375 static void jpeg_put_comments(MpegEncContext *s)
377 PutBitContext *p = &s->pb;
381 if (s->aspect_ratio_info /* && !lossless */)
386 ff_put_string(p, "JFIF", 1); /* this puts the trailing zero-byte too */
387 put_bits(p, 16, 0x0201); /* v 1.02 */
388 put_bits(p, 8, 0); /* units type: 0 - aspect ratio */
389 put_bits(p, 16, s->avctx->sample_aspect_ratio.num);
390 put_bits(p, 16, s->avctx->sample_aspect_ratio.den);
391 put_bits(p, 8, 0); /* thumbnail width */
392 put_bits(p, 8, 0); /* thumbnail height */
396 if(!(s->flags & CODEC_FLAG_BITEXACT)){
400 put_bits(p, 16, 0); /* patched later */
401 ff_put_string(p, LIBAVCODEC_IDENT, 1);
402 size = strlen(LIBAVCODEC_IDENT)+3;
407 if( s->avctx->pix_fmt == PIX_FMT_YUV420P
408 ||s->avctx->pix_fmt == PIX_FMT_YUV422P
409 ||s->avctx->pix_fmt == PIX_FMT_YUV444P){
413 put_bits(p, 16, 0); /* patched later */
414 ff_put_string(p, "CS=ITU601", 1);
415 size = strlen("CS=ITU601")+3;
421 void mjpeg_picture_header(MpegEncContext *s)
423 const int lossless= s->avctx->codec_id != CODEC_ID_MJPEG;
424 const int ls = s->avctx->codec_id == CODEC_ID_JPEGLS;
426 assert(!(ls && s->mjpeg_write_tables));
428 put_marker(&s->pb, SOI);
430 if (!s->mjpeg_data_only_frames)
432 jpeg_put_comments(s);
434 if (s->mjpeg_write_tables) jpeg_table_header(s);
436 switch(s->avctx->codec_id){
437 case CODEC_ID_MJPEG: put_marker(&s->pb, SOF0 ); break;
438 case CODEC_ID_LJPEG: put_marker(&s->pb, SOF3 ); break;
439 case CODEC_ID_JPEGLS: put_marker(&s->pb, SOF48); break;
443 put_bits(&s->pb, 16, 17);
444 if(lossless && s->avctx->pix_fmt == PIX_FMT_RGB32)
445 put_bits(&s->pb, 8, 9); /* 9 bits/component RCT */
447 put_bits(&s->pb, 8, 8); /* 8 bits/component */
448 put_bits(&s->pb, 16, s->height);
449 put_bits(&s->pb, 16, s->width);
450 put_bits(&s->pb, 8, 3); /* 3 components */
453 put_bits(&s->pb, 8, 1); /* component number */
454 put_bits(&s->pb, 4, s->mjpeg_hsample[0]); /* H factor */
455 put_bits(&s->pb, 4, s->mjpeg_vsample[0]); /* V factor */
456 put_bits(&s->pb, 8, 0); /* select matrix */
459 put_bits(&s->pb, 8, 2); /* component number */
460 put_bits(&s->pb, 4, s->mjpeg_hsample[1]); /* H factor */
461 put_bits(&s->pb, 4, s->mjpeg_vsample[1]); /* V factor */
463 put_bits(&s->pb, 8, lossless ? 0 : 1); /* select matrix */
465 put_bits(&s->pb, 8, 0); /* select matrix */
469 put_bits(&s->pb, 8, 3); /* component number */
470 put_bits(&s->pb, 4, s->mjpeg_hsample[2]); /* H factor */
471 put_bits(&s->pb, 4, s->mjpeg_vsample[2]); /* V factor */
473 put_bits(&s->pb, 8, lossless ? 0 : 1); /* select matrix */
475 put_bits(&s->pb, 8, 0); /* select matrix */
480 put_marker(&s->pb, SOS);
481 put_bits(&s->pb, 16, 12); /* length */
482 put_bits(&s->pb, 8, 3); /* 3 components */
485 put_bits(&s->pb, 8, 1); /* index */
486 put_bits(&s->pb, 4, 0); /* DC huffman table index */
487 put_bits(&s->pb, 4, 0); /* AC huffman table index */
490 put_bits(&s->pb, 8, 2); /* index */
491 put_bits(&s->pb, 4, 1); /* DC huffman table index */
492 put_bits(&s->pb, 4, lossless ? 0 : 1); /* AC huffman table index */
495 put_bits(&s->pb, 8, 3); /* index */
496 put_bits(&s->pb, 4, 1); /* DC huffman table index */
497 put_bits(&s->pb, 4, lossless ? 0 : 1); /* AC huffman table index */
499 put_bits(&s->pb, 8, (lossless && !ls) ? s->avctx->prediction_method+1 : 0); /* Ss (not used) */
501 switch(s->avctx->codec_id){
502 case CODEC_ID_MJPEG: put_bits(&s->pb, 8, 63); break; /* Se (not used) */
503 case CODEC_ID_LJPEG: put_bits(&s->pb, 8, 0); break; /* not used */
504 case CODEC_ID_JPEGLS: put_bits(&s->pb, 8, 1); break; /* ILV = line interleaved */
508 put_bits(&s->pb, 8, 0); /* Ah/Al (not used) */
510 //FIXME DC/AC entropy table selectors stuff in jpegls
513 static void escape_FF(MpegEncContext *s, int start)
515 int size= put_bits_count(&s->pb) - start*8;
517 uint8_t *buf= s->pb.buf + start;
518 int align= (-(size_t)(buf))&3;
520 assert((size&7) == 0);
524 for(i=0; i<size && i<align; i++){
525 if(buf[i]==0xFF) ff_count++;
527 for(; i<size-15; i+=16){
530 v= *(uint32_t*)(&buf[i]);
531 acc= (((v & (v>>4))&0x0F0F0F0F)+0x01010101)&0x10101010;
532 v= *(uint32_t*)(&buf[i+4]);
533 acc+=(((v & (v>>4))&0x0F0F0F0F)+0x01010101)&0x10101010;
534 v= *(uint32_t*)(&buf[i+8]);
535 acc+=(((v & (v>>4))&0x0F0F0F0F)+0x01010101)&0x10101010;
536 v= *(uint32_t*)(&buf[i+12]);
537 acc+=(((v & (v>>4))&0x0F0F0F0F)+0x01010101)&0x10101010;
545 if(buf[i]==0xFF) ff_count++;
548 if(ff_count==0) return;
551 for(i=0; i<ff_count-3; i+=4)
552 put_bits(&s->pb, 32, 0);
553 put_bits(&s->pb, (ff_count-i)*8, 0);
554 flush_put_bits(&s->pb);
556 for(i=size-1; ff_count; i--){
560 //printf("%d %d\n", i, ff_count);
569 void ff_mjpeg_stuffing(PutBitContext * pbc)
572 length= (-put_bits_count(pbc))&7;
573 if(length) put_bits(pbc, length, (1<<length)-1);
576 void mjpeg_picture_trailer(MpegEncContext *s)
578 ff_mjpeg_stuffing(&s->pb);
579 flush_put_bits(&s->pb);
581 assert((s->header_bits&7)==0);
583 escape_FF(s, s->header_bits>>3);
585 put_marker(&s->pb, EOI);
588 static inline void mjpeg_encode_dc(MpegEncContext *s, int val,
589 uint8_t *huff_size, uint16_t *huff_code)
594 put_bits(&s->pb, huff_size[0], huff_code[0]);
602 nbits= av_log2_16bit(val) + 1;
604 put_bits(&s->pb, huff_size[nbits], huff_code[nbits]);
606 put_bits(&s->pb, nbits, mant & ((1 << nbits) - 1));
610 static void encode_block(MpegEncContext *s, DCTELEM *block, int n)
612 int mant, nbits, code, i, j;
613 int component, dc, run, last_index, val;
614 MJpegContext *m = s->mjpeg_ctx;
615 uint8_t *huff_size_ac;
616 uint16_t *huff_code_ac;
619 component = (n <= 3 ? 0 : (n&1) + 1);
620 dc = block[0]; /* overflow is impossible */
621 val = dc - s->last_dc[component];
623 mjpeg_encode_dc(s, val, m->huff_size_dc_luminance, m->huff_code_dc_luminance);
624 huff_size_ac = m->huff_size_ac_luminance;
625 huff_code_ac = m->huff_code_ac_luminance;
627 mjpeg_encode_dc(s, val, m->huff_size_dc_chrominance, m->huff_code_dc_chrominance);
628 huff_size_ac = m->huff_size_ac_chrominance;
629 huff_code_ac = m->huff_code_ac_chrominance;
631 s->last_dc[component] = dc;
636 last_index = s->block_last_index[n];
637 for(i=1;i<=last_index;i++) {
638 j = s->intra_scantable.permutated[i];
644 put_bits(&s->pb, huff_size_ac[0xf0], huff_code_ac[0xf0]);
653 nbits= av_log2(val) + 1;
654 code = (run << 4) | nbits;
656 put_bits(&s->pb, huff_size_ac[code], huff_code_ac[code]);
658 put_bits(&s->pb, nbits, mant & ((1 << nbits) - 1));
663 /* output EOB only if not already 64 values */
664 if (last_index < 63 || run != 0)
665 put_bits(&s->pb, huff_size_ac[0], huff_code_ac[0]);
668 void mjpeg_encode_mb(MpegEncContext *s,
669 DCTELEM block[6][64])
673 encode_block(s, block[i], i);
675 if (s->chroma_format == CHROMA_420) {
676 encode_block(s, block[5], 5);
678 encode_block(s, block[6], 6);
679 encode_block(s, block[5], 5);
680 encode_block(s, block[7], 7);
684 static int encode_picture_lossless(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){
685 MpegEncContext * const s = avctx->priv_data;
686 MJpegContext * const m = s->mjpeg_ctx;
687 AVFrame *pict = data;
688 const int width= s->width;
689 const int height= s->height;
690 AVFrame * const p= (AVFrame*)&s->current_picture;
691 const int predictor= avctx->prediction_method+1;
693 init_put_bits(&s->pb, buf, buf_size);
696 p->pict_type= FF_I_TYPE;
699 mjpeg_picture_header(s);
701 s->header_bits= put_bits_count(&s->pb);
703 if(avctx->pix_fmt == PIX_FMT_RGB32){
705 const int linesize= p->linesize[0];
706 uint16_t (*buffer)[4]= (void *) s->rd_scratchpad;
707 int left[3], top[3], topleft[3];
710 buffer[0][i]= 1 << (9 - 1);
713 for(y = 0; y < height; y++) {
714 const int modified_predictor= y ? predictor : 1;
715 uint8_t *ptr = p->data[0] + (linesize * y);
717 if(s->pb.buf_end - s->pb.buf - (put_bits_count(&s->pb)>>3) < width*3*4){
718 av_log(s->avctx, AV_LOG_ERROR, "encoded frame too large\n");
723 top[i]= left[i]= topleft[i]= buffer[0][i];
725 for(x = 0; x < width; x++) {
726 buffer[x][1] = ptr[4*x+0] - ptr[4*x+1] + 0x100;
727 buffer[x][2] = ptr[4*x+2] - ptr[4*x+1] + 0x100;
728 buffer[x][0] = (ptr[4*x+0] + 2*ptr[4*x+1] + ptr[4*x+2])>>2;
733 PREDICT(pred, topleft[i], top[i], left[i], modified_predictor);
736 top[i]= buffer[x+1][i];
738 left[i]= buffer[x][i];
740 diff= ((left[i] - pred + 0x100)&0x1FF) - 0x100;
743 mjpeg_encode_dc(s, diff, m->huff_size_dc_luminance, m->huff_code_dc_luminance); //FIXME ugly
745 mjpeg_encode_dc(s, diff, m->huff_size_dc_chrominance, m->huff_code_dc_chrominance);
751 const int mb_width = (width + s->mjpeg_hsample[0] - 1) / s->mjpeg_hsample[0];
752 const int mb_height = (height + s->mjpeg_vsample[0] - 1) / s->mjpeg_vsample[0];
754 for(mb_y = 0; mb_y < mb_height; mb_y++) {
755 if(s->pb.buf_end - s->pb.buf - (put_bits_count(&s->pb)>>3) < mb_width * 4 * 3 * s->mjpeg_hsample[0] * s->mjpeg_vsample[0]){
756 av_log(s->avctx, AV_LOG_ERROR, "encoded frame too large\n");
759 for(mb_x = 0; mb_x < mb_width; mb_x++) {
760 if(mb_x==0 || mb_y==0){
763 int x, y, h, v, linesize;
764 h = s->mjpeg_hsample[i];
765 v = s->mjpeg_vsample[i];
766 linesize= p->linesize[i];
772 ptr = p->data[i] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
781 pred= ptr[-linesize];
783 PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor);
788 mjpeg_encode_dc(s, (int8_t)(*ptr - pred), m->huff_size_dc_luminance, m->huff_code_dc_luminance); //FIXME ugly
790 mjpeg_encode_dc(s, (int8_t)(*ptr - pred), m->huff_size_dc_chrominance, m->huff_code_dc_chrominance);
797 int x, y, h, v, linesize;
798 h = s->mjpeg_hsample[i];
799 v = s->mjpeg_vsample[i];
800 linesize= p->linesize[i];
806 ptr = p->data[i] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
807 //printf("%d %d %d %d %8X\n", mb_x, mb_y, x, y, ptr);
808 PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor);
811 mjpeg_encode_dc(s, (int8_t)(*ptr - pred), m->huff_size_dc_luminance, m->huff_code_dc_luminance); //FIXME ugly
813 mjpeg_encode_dc(s, (int8_t)(*ptr - pred), m->huff_size_dc_chrominance, m->huff_code_dc_chrominance);
824 mjpeg_picture_trailer(s);
827 flush_put_bits(&s->pb);
828 return pbBufPtr(&s->pb) - s->pb.buf;
829 // return (put_bits_count(&f->pb)+7)/8;
832 #endif //CONFIG_ENCODERS
834 /******************************************/
837 #define MAX_COMPONENTS 4
839 typedef struct MJpegDecodeContext {
840 AVCodecContext *avctx;
843 int start_code; /* current start code */
847 int16_t quant_matrixes[4][64];
849 int qscale[4]; ///< quantizer scale calculated from quant_matrixes
851 int org_height; /* size given at codec init */
852 int first_picture; /* true if decoding first picture */
853 int interlaced; /* true if interlaced */
854 int bottom_field; /* true if bottom field */
859 int rct; /* standard rct */
860 int pegasus_rct; /* pegasus reversible colorspace transform */
861 int bits; /* bits per component */
864 int near; ///< near lossless bound (si 0 for lossless)
866 int reset; ///< context halfing intervall ?rename
869 int mb_width, mb_height;
871 int component_id[MAX_COMPONENTS];
872 int h_count[MAX_COMPONENTS]; /* horizontal and vertical count for each component */
873 int v_count[MAX_COMPONENTS];
874 int comp_index[MAX_COMPONENTS];
875 int dc_index[MAX_COMPONENTS];
876 int ac_index[MAX_COMPONENTS];
877 int nb_blocks[MAX_COMPONENTS];
878 int h_scount[MAX_COMPONENTS];
879 int v_scount[MAX_COMPONENTS];
880 int h_max, v_max; /* maximum h and v counts */
881 int quant_index[4]; /* quant table index for each component */
882 int last_dc[MAX_COMPONENTS]; /* last DEQUANTIZED dc (XXX: am I right to do that ?) */
883 AVFrame picture; /* picture structure */
884 int linesize[MAX_COMPONENTS]; ///< linesize << interlaced
885 int8_t *qscale_table;
886 DECLARE_ALIGNED_8(DCTELEM, block[64]);
890 int restart_interval;
895 int interlace_polarity;
899 int cur_scan; /* current scan, used by JPEG-LS */
900 } MJpegDecodeContext;
902 #include "jpeg_ls.c" //FIXME make jpeg-ls more independent
904 static int mjpeg_decode_dht(MJpegDecodeContext *s);
906 static int build_vlc(VLC *vlc, const uint8_t *bits_table, const uint8_t *val_table,
907 int nb_codes, int use_static, int is_ac)
909 uint8_t huff_size[256+16];
910 uint16_t huff_code[256+16];
912 assert(nb_codes <= 256);
914 memset(huff_size, 0, sizeof(huff_size));
915 build_huffman_codes(huff_size, huff_code, bits_table, val_table);
918 memmove(huff_size+16, huff_size, sizeof(uint8_t)*nb_codes);
919 memmove(huff_code+16, huff_code, sizeof(uint16_t)*nb_codes);
920 memset(huff_size, 0, sizeof(uint8_t)*16);
921 memset(huff_code, 0, sizeof(uint16_t)*16);
925 return init_vlc(vlc, 9, nb_codes, huff_size, 1, 1, huff_code, 2, 2, use_static);
928 static int mjpeg_decode_init(AVCodecContext *avctx)
930 MJpegDecodeContext *s = avctx->priv_data;
933 dsputil_init(&s->dsp, avctx);
934 ff_init_scantable(s->dsp.idct_permutation, &s->scantable, ff_zigzag_direct);
938 s->first_picture = 1;
939 s->org_height = avctx->coded_height;
941 build_vlc(&s->vlcs[0][0], bits_dc_luminance, val_dc_luminance, 12, 0, 0);
942 build_vlc(&s->vlcs[0][1], bits_dc_chrominance, val_dc_chrominance, 12, 0, 0);
943 build_vlc(&s->vlcs[1][0], bits_ac_luminance, val_ac_luminance, 251, 0, 1);
944 build_vlc(&s->vlcs[1][1], bits_ac_chrominance, val_ac_chrominance, 251, 0, 1);
946 if (avctx->flags & CODEC_FLAG_EXTERN_HUFF)
948 av_log(avctx, AV_LOG_INFO, "mjpeg: using external huffman table\n");
949 init_get_bits(&s->gb, avctx->extradata, avctx->extradata_size*8);
951 /* should check for error - but dunno */
953 if (avctx->extradata_size > 9 &&
954 AV_RL32(avctx->extradata + 4) == MKTAG('f','i','e','l')) {
955 if (avctx->extradata[9] == 6) { /* quicktime icefloe 019 */
956 s->interlace_polarity = 1; /* bottom field first */
957 av_log(avctx, AV_LOG_DEBUG, "mjpeg bottom field first\n");
965 /* quantize tables */
966 static int mjpeg_decode_dqt(MJpegDecodeContext *s)
968 int len, index, i, j;
970 len = get_bits(&s->gb, 16) - 2;
973 /* only 8 bit precision handled */
974 if (get_bits(&s->gb, 4) != 0)
976 av_log(s->avctx, AV_LOG_ERROR, "dqt: 16bit precision\n");
979 index = get_bits(&s->gb, 4);
982 av_log(s->avctx, AV_LOG_DEBUG, "index=%d\n", index);
983 /* read quant table */
985 j = s->scantable.permutated[i];
986 s->quant_matrixes[index][j] = get_bits(&s->gb, 8);
989 //XXX FIXME finetune, and perhaps add dc too
990 s->qscale[index]= FFMAX(
991 s->quant_matrixes[index][s->scantable.permutated[1]],
992 s->quant_matrixes[index][s->scantable.permutated[8]]) >> 1;
993 av_log(s->avctx, AV_LOG_DEBUG, "qscale[%d]: %d\n", index, s->qscale[index]);
1000 /* decode huffman tables and build VLC decoders */
1001 static int mjpeg_decode_dht(MJpegDecodeContext *s)
1003 int len, index, i, class, n, v, code_max;
1004 uint8_t bits_table[17];
1005 uint8_t val_table[256];
1007 len = get_bits(&s->gb, 16) - 2;
1012 class = get_bits(&s->gb, 4);
1015 index = get_bits(&s->gb, 4);
1019 for(i=1;i<=16;i++) {
1020 bits_table[i] = get_bits(&s->gb, 8);
1024 if (len < n || n > 256)
1029 v = get_bits(&s->gb, 8);
1036 /* build VLC and flush previous vlc if present */
1037 free_vlc(&s->vlcs[class][index]);
1038 av_log(s->avctx, AV_LOG_DEBUG, "class=%d index=%d nb_codes=%d\n",
1039 class, index, code_max + 1);
1040 if(build_vlc(&s->vlcs[class][index], bits_table, val_table, code_max + 1, 0, class > 0) < 0){
1047 static int mjpeg_decode_sof(MJpegDecodeContext *s)
1049 int len, nb_components, i, width, height, pix_fmt_id;
1051 /* XXX: verify len field validity */
1052 len = get_bits(&s->gb, 16);
1053 s->bits= get_bits(&s->gb, 8);
1055 if(s->pegasus_rct) s->bits=9;
1056 if(s->bits==9 && !s->pegasus_rct) s->rct=1; //FIXME ugly
1058 if (s->bits != 8 && !s->lossless){
1059 av_log(s->avctx, AV_LOG_ERROR, "only 8 bits/component accepted\n");
1063 height = get_bits(&s->gb, 16);
1064 width = get_bits(&s->gb, 16);
1066 //HACK for odd_height.mov
1067 if(s->interlaced && s->width == width && s->height == height + 1)
1070 av_log(s->avctx, AV_LOG_DEBUG, "sof0: picture: %dx%d\n", width, height);
1071 if(avcodec_check_dimensions(s->avctx, width, height))
1074 nb_components = get_bits(&s->gb, 8);
1075 if (nb_components <= 0 ||
1076 nb_components > MAX_COMPONENTS)
1078 if (s->ls && !(s->bits <= 8 || nb_components == 1)){
1079 av_log(s->avctx, AV_LOG_ERROR, "only <= 8 bits/component or 16-bit gray accepted for JPEG-LS\n");
1082 s->nb_components = nb_components;
1085 for(i=0;i<nb_components;i++) {
1087 s->component_id[i] = get_bits(&s->gb, 8) - 1;
1088 s->h_count[i] = get_bits(&s->gb, 4);
1089 s->v_count[i] = get_bits(&s->gb, 4);
1090 /* compute hmax and vmax (only used in interleaved case) */
1091 if (s->h_count[i] > s->h_max)
1092 s->h_max = s->h_count[i];
1093 if (s->v_count[i] > s->v_max)
1094 s->v_max = s->v_count[i];
1095 s->quant_index[i] = get_bits(&s->gb, 8);
1096 if (s->quant_index[i] >= 4)
1098 av_log(s->avctx, AV_LOG_DEBUG, "component %d %d:%d id: %d quant:%d\n", i, s->h_count[i],
1099 s->v_count[i], s->component_id[i], s->quant_index[i]);
1102 if(s->ls && (s->h_max > 1 || s->v_max > 1)) {
1103 av_log(s->avctx, AV_LOG_ERROR, "Subsampling in JPEG-LS is not supported.\n");
1107 if(s->v_max==1 && s->h_max==1 && s->lossless==1) s->rgb=1;
1109 /* if different size, realloc/alloc picture */
1110 /* XXX: also check h_count and v_count */
1111 if (width != s->width || height != s->height) {
1112 av_freep(&s->qscale_table);
1118 /* test interlaced mode */
1119 if (s->first_picture &&
1120 s->org_height != 0 &&
1121 s->height < ((s->org_height * 3) / 4)) {
1123 s->bottom_field = s->interlace_polarity;
1124 s->picture.interlaced_frame = 1;
1125 s->picture.top_field_first = !s->interlace_polarity;
1129 avcodec_set_dimensions(s->avctx, width, height);
1131 s->qscale_table= av_mallocz((s->width+15)/16);
1133 s->first_picture = 0;
1136 if(s->interlaced && (s->bottom_field == !s->interlace_polarity))
1139 /* XXX: not complete test ! */
1140 pix_fmt_id = (s->h_count[0] << 20) | (s->v_count[0] << 16) |
1141 (s->h_count[1] << 12) | (s->v_count[1] << 8) |
1142 (s->h_count[2] << 4) | s->v_count[2];
1143 av_log(s->avctx, AV_LOG_DEBUG, "pix fmt id %x\n", pix_fmt_id);
1148 s->avctx->pix_fmt = PIX_FMT_RGB32;
1149 }else if(s->nb_components==3)
1150 s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV444P : PIX_FMT_YUVJ444P;
1152 s->avctx->pix_fmt = PIX_FMT_GRAY8;
1156 s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV422P : PIX_FMT_YUVJ422P;
1160 s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV420P : PIX_FMT_YUVJ420P;
1164 if(s->nb_components > 1)
1165 s->avctx->pix_fmt = PIX_FMT_RGB24;
1166 else if(s->bits <= 8)
1167 s->avctx->pix_fmt = PIX_FMT_GRAY8;
1169 s->avctx->pix_fmt = PIX_FMT_GRAY16;
1172 if(s->picture.data[0])
1173 s->avctx->release_buffer(s->avctx, &s->picture);
1175 s->picture.reference= 0;
1176 if(s->avctx->get_buffer(s->avctx, &s->picture) < 0){
1177 av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed\n");
1180 s->picture.pict_type= I_TYPE;
1181 s->picture.key_frame= 1;
1184 s->linesize[i]= s->picture.linesize[i] << s->interlaced;
1187 // printf("%d %d %d %d %d %d\n", s->width, s->height, s->linesize[0], s->linesize[1], s->interlaced, s->avctx->height);
1189 if (len != (8+(3*nb_components)))
1191 av_log(s->avctx, AV_LOG_DEBUG, "decode_sof0: error, len(%d) mismatch\n", len);
1194 /* totally blank picture as progressive JPEG will only add details to it */
1196 memset(s->picture.data[0], 0, s->picture.linesize[0] * s->height);
1197 memset(s->picture.data[1], 0, s->picture.linesize[1] * s->height >> (s->v_max - s->v_count[1]));
1198 memset(s->picture.data[2], 0, s->picture.linesize[2] * s->height >> (s->v_max - s->v_count[2]));
1203 static inline int mjpeg_decode_dc(MJpegDecodeContext *s, int dc_index)
1206 code = get_vlc2(&s->gb, s->vlcs[0][dc_index].table, 9, 2);
1209 av_log(s->avctx, AV_LOG_WARNING, "mjpeg_decode_dc: bad vlc: %d:%d (%p)\n", 0, dc_index,
1210 &s->vlcs[0][dc_index]);
1215 return get_xbits(&s->gb, code);
1220 /* decode block and dequantize */
1221 static int decode_block(MJpegDecodeContext *s, DCTELEM *block,
1222 int component, int dc_index, int ac_index, int16_t *quant_matrix)
1224 int code, i, j, level, val;
1227 val = mjpeg_decode_dc(s, dc_index);
1228 if (val == 0xffff) {
1229 av_log(s->avctx, AV_LOG_ERROR, "error dc\n");
1232 val = val * quant_matrix[0] + s->last_dc[component];
1233 s->last_dc[component] = val;
1237 {OPEN_READER(re, &s->gb)
1239 UPDATE_CACHE(re, &s->gb);
1240 GET_VLC(code, re, &s->gb, s->vlcs[1][ac_index].table, 9, 2)
1245 i += ((unsigned)code) >> 4;
1248 if(code > MIN_CACHE_BITS - 16){
1249 UPDATE_CACHE(re, &s->gb)
1252 int cache=GET_CACHE(re,&s->gb);
1253 int sign=(~cache)>>31;
1254 level = (NEG_USR32(sign ^ cache,code) ^ sign) - sign;
1257 LAST_SKIP_BITS(re, &s->gb, code)
1261 j = s->scantable.permutated[63];
1262 block[j] = level * quant_matrix[j];
1265 av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i);
1268 j = s->scantable.permutated[i];
1269 block[j] = level * quant_matrix[j];
1272 CLOSE_READER(re, &s->gb)}
1277 /* decode block and dequantize - progressive JPEG version */
1278 static int decode_block_progressive(MJpegDecodeContext *s, DCTELEM *block,
1279 int component, int dc_index, int ac_index, int16_t *quant_matrix,
1280 int ss, int se, int Ah, int Al, int *EOBRUN)
1282 int code, i, j, level, val, run;
1286 val = mjpeg_decode_dc(s, dc_index);
1287 if (val == 0xffff) {
1288 av_log(s->avctx, AV_LOG_ERROR, "error dc\n");
1291 val = (val * quant_matrix[0] << Al) + s->last_dc[component];
1294 s->last_dc[component] = val;
1302 {OPEN_READER(re, &s->gb)
1304 UPDATE_CACHE(re, &s->gb);
1305 GET_VLC(code, re, &s->gb, s->vlcs[1][ac_index].table, 9, 2)
1306 /* Progressive JPEG use AC coeffs from zero and this decoder sets offset 16 by default */
1309 i += ((unsigned) code) >> 4;
1311 if(code > MIN_CACHE_BITS - 16){
1312 UPDATE_CACHE(re, &s->gb)
1315 int cache=GET_CACHE(re,&s->gb);
1316 int sign=(~cache)>>31;
1317 level = (NEG_USR32(sign ^ cache,code) ^ sign) - sign;
1320 LAST_SKIP_BITS(re, &s->gb, code)
1324 j = s->scantable.permutated[se];
1325 block[j] = level * quant_matrix[j] << Al;
1328 av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i);
1331 j = s->scantable.permutated[i];
1332 block[j] = level * quant_matrix[j] << Al;
1334 run = ((unsigned) code) >> 4;
1335 if(run == 0xF){// ZRL - skip 15 coefficients
1340 UPDATE_CACHE(re, &s->gb);
1341 run += (GET_CACHE(re, &s->gb) >> (32 - val)) & (run - 1);
1343 LAST_SKIP_BITS(re, &s->gb, val);
1349 CLOSE_READER(re, &s->gb)}
1354 static int ljpeg_decode_rgb_scan(MJpegDecodeContext *s, int predictor, int point_transform){
1356 uint16_t buffer[32768][4];
1357 int left[3], top[3], topleft[3];
1358 const int linesize= s->linesize[0];
1359 const int mask= (1<<s->bits)-1;
1361 if((unsigned)s->mb_width > 32768) //dynamic alloc
1365 buffer[0][i]= 1 << (s->bits + point_transform - 1);
1367 for(mb_y = 0; mb_y < s->mb_height; mb_y++) {
1368 const int modified_predictor= mb_y ? predictor : 1;
1369 uint8_t *ptr = s->picture.data[0] + (linesize * mb_y);
1371 if (s->interlaced && s->bottom_field)
1372 ptr += linesize >> 1;
1375 top[i]= left[i]= topleft[i]= buffer[0][i];
1377 for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
1378 if (s->restart_interval && !s->restart_count)
1379 s->restart_count = s->restart_interval;
1385 top[i]= buffer[mb_x][i];
1387 PREDICT(pred, topleft[i], top[i], left[i], modified_predictor);
1390 buffer[mb_x][i]= mask & (pred + (mjpeg_decode_dc(s, s->dc_index[i]) << point_transform));
1393 if (s->restart_interval && !--s->restart_count) {
1394 align_get_bits(&s->gb);
1395 skip_bits(&s->gb, 16); /* skip RSTn */
1400 for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
1401 ptr[4*mb_x+1] = buffer[mb_x][0] - ((buffer[mb_x][1] + buffer[mb_x][2] - 0x200)>>2);
1402 ptr[4*mb_x+0] = buffer[mb_x][1] + ptr[4*mb_x+1];
1403 ptr[4*mb_x+2] = buffer[mb_x][2] + ptr[4*mb_x+1];
1405 }else if(s->pegasus_rct){
1406 for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
1407 ptr[4*mb_x+1] = buffer[mb_x][0] - ((buffer[mb_x][1] + buffer[mb_x][2])>>2);
1408 ptr[4*mb_x+0] = buffer[mb_x][1] + ptr[4*mb_x+1];
1409 ptr[4*mb_x+2] = buffer[mb_x][2] + ptr[4*mb_x+1];
1412 for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
1413 ptr[4*mb_x+0] = buffer[mb_x][0];
1414 ptr[4*mb_x+1] = buffer[mb_x][1];
1415 ptr[4*mb_x+2] = buffer[mb_x][2];
1422 static int ljpeg_decode_yuv_scan(MJpegDecodeContext *s, int predictor, int point_transform){
1424 const int nb_components=3;
1426 for(mb_y = 0; mb_y < s->mb_height; mb_y++) {
1427 for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
1428 if (s->restart_interval && !s->restart_count)
1429 s->restart_count = s->restart_interval;
1431 if(mb_x==0 || mb_y==0 || s->interlaced){
1432 for(i=0;i<nb_components;i++) {
1434 int n, h, v, x, y, c, j, linesize;
1435 n = s->nb_blocks[i];
1436 c = s->comp_index[i];
1441 linesize= s->linesize[c];
1443 for(j=0; j<n; j++) {
1446 ptr = s->picture.data[c] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
1447 if(y==0 && mb_y==0){
1448 if(x==0 && mb_x==0){
1449 pred= 128 << point_transform;
1454 if(x==0 && mb_x==0){
1455 pred= ptr[-linesize];
1457 PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor);
1461 if (s->interlaced && s->bottom_field)
1462 ptr += linesize >> 1;
1463 *ptr= pred + (mjpeg_decode_dc(s, s->dc_index[i]) << point_transform);
1472 for(i=0;i<nb_components;i++) {
1474 int n, h, v, x, y, c, j, linesize;
1475 n = s->nb_blocks[i];
1476 c = s->comp_index[i];
1481 linesize= s->linesize[c];
1483 for(j=0; j<n; j++) {
1486 ptr = s->picture.data[c] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
1487 PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor);
1488 *ptr= pred + (mjpeg_decode_dc(s, s->dc_index[i]) << point_transform);
1496 if (s->restart_interval && !--s->restart_count) {
1497 align_get_bits(&s->gb);
1498 skip_bits(&s->gb, 16); /* skip RSTn */
1505 static int mjpeg_decode_scan(MJpegDecodeContext *s, int nb_components, int ss, int se, int Ah, int Al){
1509 if(Ah) return 0; /* TODO decode refinement planes too */
1510 for(mb_y = 0; mb_y < s->mb_height; mb_y++) {
1511 for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
1512 if (s->restart_interval && !s->restart_count)
1513 s->restart_count = s->restart_interval;
1515 for(i=0;i<nb_components;i++) {
1517 int n, h, v, x, y, c, j;
1518 n = s->nb_blocks[i];
1519 c = s->comp_index[i];
1525 memset(s->block, 0, sizeof(s->block));
1526 if (!s->progressive && decode_block(s, s->block, i,
1527 s->dc_index[i], s->ac_index[i],
1528 s->quant_matrixes[ s->quant_index[c] ]) < 0) {
1529 av_log(s->avctx, AV_LOG_ERROR, "error y=%d x=%d\n", mb_y, mb_x);
1532 if (s->progressive && decode_block_progressive(s, s->block, i,
1533 s->dc_index[i], s->ac_index[i],
1534 s->quant_matrixes[ s->quant_index[c] ], ss, se, Ah, Al, &EOBRUN) < 0) {
1535 av_log(s->avctx, AV_LOG_ERROR, "error y=%d x=%d\n", mb_y, mb_x);
1538 // av_log(s->avctx, AV_LOG_DEBUG, "mb: %d %d processed\n", mb_y, mb_x);
1539 ptr = s->picture.data[c] +
1540 (((s->linesize[c] * (v * mb_y + y) * 8) +
1541 (h * mb_x + x) * 8) >> s->avctx->lowres);
1542 if (s->interlaced && s->bottom_field)
1543 ptr += s->linesize[c] >> 1;
1544 //av_log(NULL, AV_LOG_DEBUG, "%d %d %d %d %d %d %d %d \n", mb_x, mb_y, x, y, c, s->bottom_field, (v * mb_y + y) * 8, (h * mb_x + x) * 8);
1546 s->dsp.idct_put(ptr, s->linesize[c], s->block);
1548 s->dsp.idct_add(ptr, s->linesize[c], s->block);
1555 /* (< 1350) buggy workaround for Spectralfan.mov, should be fixed */
1556 if (s->restart_interval && (s->restart_interval < 1350) &&
1557 !--s->restart_count) {
1558 align_get_bits(&s->gb);
1559 skip_bits(&s->gb, 16); /* skip RSTn */
1560 for (i=0; i<nb_components; i++) /* reset dc */
1561 s->last_dc[i] = 1024;
1568 static int mjpeg_decode_sos(MJpegDecodeContext *s)
1570 int len, nb_components, i, h, v, predictor, point_transform;
1571 int vmax, hmax, index, id;
1572 const int block_size= s->lossless ? 1 : 8;
1573 int ilv, prev_shift;
1575 /* XXX: verify len field validity */
1576 len = get_bits(&s->gb, 16);
1577 nb_components = get_bits(&s->gb, 8);
1578 if (len != 6+2*nb_components)
1580 av_log(s->avctx, AV_LOG_ERROR, "decode_sos: invalid len (%d)\n", len);
1585 for(i=0;i<nb_components;i++) {
1586 id = get_bits(&s->gb, 8) - 1;
1587 av_log(s->avctx, AV_LOG_DEBUG, "component: %d\n", id);
1588 /* find component index */
1589 for(index=0;index<s->nb_components;index++)
1590 if (id == s->component_id[index])
1592 if (index == s->nb_components)
1594 av_log(s->avctx, AV_LOG_ERROR, "decode_sos: index(%d) out of components\n", index);
1598 s->comp_index[i] = index;
1600 s->nb_blocks[i] = s->h_count[index] * s->v_count[index];
1601 s->h_scount[i] = s->h_count[index];
1602 s->v_scount[i] = s->v_count[index];
1604 s->dc_index[i] = get_bits(&s->gb, 4);
1605 s->ac_index[i] = get_bits(&s->gb, 4);
1607 if (s->dc_index[i] < 0 || s->ac_index[i] < 0 ||
1608 s->dc_index[i] >= 4 || s->ac_index[i] >= 4)
1611 switch(s->start_code)
1614 if (dc_index[i] > 1 || ac_index[i] > 1)
1619 if (dc_index[i] > 3 || ac_index[i] > 3)
1623 if (dc_index[i] > 3 || ac_index[i] != 0)
1630 predictor= get_bits(&s->gb, 8); /* JPEG Ss / lossless JPEG predictor /JPEG-LS NEAR */
1631 ilv= get_bits(&s->gb, 8); /* JPEG Se / JPEG-LS ILV */
1632 prev_shift = get_bits(&s->gb, 4); /* Ah */
1633 point_transform= get_bits(&s->gb, 4); /* Al */
1635 for(i=0;i<nb_components;i++)
1636 s->last_dc[i] = 1024;
1638 if (nb_components > 1) {
1639 /* interleaved stream */
1640 s->mb_width = (s->width + s->h_max * block_size - 1) / (s->h_max * block_size);
1641 s->mb_height = (s->height + s->v_max * block_size - 1) / (s->v_max * block_size);
1642 } else if(!s->ls) { /* skip this for JPEG-LS */
1643 h = s->h_max / s->h_scount[0];
1644 v = s->v_max / s->v_scount[0];
1645 s->mb_width = (s->width + h * block_size - 1) / (h * block_size);
1646 s->mb_height = (s->height + v * block_size - 1) / (v * block_size);
1647 s->nb_blocks[0] = 1;
1652 if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1653 av_log(s->avctx, AV_LOG_DEBUG, "%s %s p:%d >>:%d ilv:%d bits:%d %s\n", s->lossless ? "lossless" : "sequencial DCT", s->rgb ? "RGB" : "",
1654 predictor, point_transform, ilv, s->bits,
1655 s->pegasus_rct ? "PRCT" : (s->rct ? "RCT" : ""));
1658 /* mjpeg-b can have padding bytes between sos and image data, skip them */
1659 for (i = s->mjpb_skiptosod; i > 0; i--)
1660 skip_bits(&s->gb, 8);
1665 // reset_ls_coding_parameters(s, 0);
1667 ls_decode_picture(s, predictor, point_transform, ilv);
1670 if(ljpeg_decode_rgb_scan(s, predictor, point_transform) < 0)
1673 if(ljpeg_decode_yuv_scan(s, predictor, point_transform) < 0)
1678 if(mjpeg_decode_scan(s, nb_components, predictor, ilv, prev_shift, point_transform) < 0)
1684 av_log(s->avctx, AV_LOG_ERROR, "decode_sos: ac/dc index out of range\n");
1688 static int mjpeg_decode_dri(MJpegDecodeContext *s)
1690 if (get_bits(&s->gb, 16) != 4)
1692 s->restart_interval = get_bits(&s->gb, 16);
1693 s->restart_count = 0;
1694 av_log(s->avctx, AV_LOG_DEBUG, "restart interval: %d\n", s->restart_interval);
1699 static int mjpeg_decode_app(MJpegDecodeContext *s)
1703 len = get_bits(&s->gb, 16);
1706 if(8*len + get_bits_count(&s->gb) > s->gb.size_in_bits)
1709 id = (get_bits(&s->gb, 16) << 16) | get_bits(&s->gb, 16);
1713 if(s->avctx->debug & FF_DEBUG_STARTCODE){
1714 av_log(s->avctx, AV_LOG_DEBUG, "APPx %8X\n", id);
1717 /* buggy AVID, it puts EOI only at every 10th frame */
1718 /* also this fourcc is used by non-avid files too, it holds some
1719 informations, but it's always present in AVID creates files */
1720 if (id == ff_get_fourcc("AVI1"))
1727 4bytes field_size_less_padding
1730 // if (s->first_picture)
1731 // printf("mjpeg: workarounding buggy AVID\n");
1732 i = get_bits(&s->gb, 8);
1733 if (i==2) s->bottom_field= 1;
1734 else if(i==1) s->bottom_field= 0;
1736 skip_bits(&s->gb, 8);
1737 skip_bits(&s->gb, 32);
1738 skip_bits(&s->gb, 32);
1741 // if (s->interlace_polarity)
1742 // printf("mjpeg: interlace polarity: %d\n", s->interlace_polarity);
1748 if (id == ff_get_fourcc("JFIF"))
1750 int t_w, t_h, v1, v2;
1751 skip_bits(&s->gb, 8); /* the trailing zero-byte */
1752 v1= get_bits(&s->gb, 8);
1753 v2= get_bits(&s->gb, 8);
1754 skip_bits(&s->gb, 8);
1756 s->avctx->sample_aspect_ratio.num= get_bits(&s->gb, 16);
1757 s->avctx->sample_aspect_ratio.den= get_bits(&s->gb, 16);
1759 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1760 av_log(s->avctx, AV_LOG_INFO, "mjpeg: JFIF header found (version: %x.%x) SAR=%d/%d\n",
1762 s->avctx->sample_aspect_ratio.num,
1763 s->avctx->sample_aspect_ratio.den
1766 t_w = get_bits(&s->gb, 8);
1767 t_h = get_bits(&s->gb, 8);
1770 /* skip thumbnail */
1771 if (len-10-(t_w*t_h*3) > 0)
1778 if (id == ff_get_fourcc("Adob") && (get_bits(&s->gb, 8) == 'e'))
1780 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1781 av_log(s->avctx, AV_LOG_INFO, "mjpeg: Adobe header found\n");
1782 skip_bits(&s->gb, 16); /* version */
1783 skip_bits(&s->gb, 16); /* flags0 */
1784 skip_bits(&s->gb, 16); /* flags1 */
1785 skip_bits(&s->gb, 8); /* transform */
1790 if (id == ff_get_fourcc("LJIF")){
1791 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1792 av_log(s->avctx, AV_LOG_INFO, "Pegasus lossless jpeg header found\n");
1793 skip_bits(&s->gb, 16); /* version ? */
1794 skip_bits(&s->gb, 16); /* unknwon always 0? */
1795 skip_bits(&s->gb, 16); /* unknwon always 0? */
1796 skip_bits(&s->gb, 16); /* unknwon always 0? */
1797 switch( get_bits(&s->gb, 8)){
1807 av_log(s->avctx, AV_LOG_ERROR, "unknown colorspace\n");
1814 if ((s->start_code == APP1) && (len > (0x28 - 8)))
1816 id = (get_bits(&s->gb, 16) << 16) | get_bits(&s->gb, 16);
1819 if (id == ff_get_fourcc("mjpg")) /* Apple MJPEG-A */
1822 skip_bits(&s->gb, 32); /* field size */
1823 skip_bits(&s->gb, 32); /* pad field size */
1824 skip_bits(&s->gb, 32); /* next off */
1825 skip_bits(&s->gb, 32); /* quant off */
1826 skip_bits(&s->gb, 32); /* huff off */
1827 skip_bits(&s->gb, 32); /* image off */
1828 skip_bits(&s->gb, 32); /* scan off */
1829 skip_bits(&s->gb, 32); /* data off */
1831 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1832 av_log(s->avctx, AV_LOG_INFO, "mjpeg: Apple MJPEG-A header found\n");
1837 /* slow but needed for extreme adobe jpegs */
1839 av_log(s->avctx, AV_LOG_ERROR, "mjpeg: error, decode_app parser read over the end\n");
1841 skip_bits(&s->gb, 8);
1846 static int mjpeg_decode_com(MJpegDecodeContext *s)
1848 int len = get_bits(&s->gb, 16);
1849 if (len >= 2 && 8*len - 16 + get_bits_count(&s->gb) <= s->gb.size_in_bits) {
1850 char *cbuf = av_malloc(len - 1);
1853 for (i = 0; i < len - 2; i++)
1854 cbuf[i] = get_bits(&s->gb, 8);
1855 if (i > 0 && cbuf[i-1] == '\n')
1860 if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1861 av_log(s->avctx, AV_LOG_INFO, "mjpeg comment: '%s'\n", cbuf);
1863 /* buggy avid, it puts EOI only at every 10th frame */
1864 if (!strcmp(cbuf, "AVID"))
1867 // if (s->first_picture)
1868 // printf("mjpeg: workarounding buggy AVID\n");
1870 else if(!strcmp(cbuf, "CS=ITU601")){
1882 static int valid_marker_list[] =
1884 /* 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, a, b, c, d, e, f */
1885 /* 0 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1886 /* 1 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1887 /* 2 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1888 /* 3 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1889 /* 4 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1890 /* 5 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1891 /* 6 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1892 /* 7 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1893 /* 8 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1894 /* 9 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1895 /* a */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1896 /* b */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1897 /* c */ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1898 /* d */ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1899 /* e */ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1900 /* f */ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0,
1904 /* return the 8 bit start code value and update the search
1905 state. Return -1 if no start code found */
1906 static int find_marker(uint8_t **pbuf_ptr, uint8_t *buf_end)
1915 buf_ptr = *pbuf_ptr;
1916 while (buf_ptr < buf_end) {
1919 if ((v == 0xff) && (v2 >= 0xc0) && (v2 <= 0xfe) && buf_ptr < buf_end) {
1930 av_log(NULL, AV_LOG_VERBOSE, "find_marker skipped %d bytes\n", skipped);
1932 *pbuf_ptr = buf_ptr;
1936 static int mjpeg_decode_frame(AVCodecContext *avctx,
1937 void *data, int *data_size,
1938 uint8_t *buf, int buf_size)
1940 MJpegDecodeContext *s = avctx->priv_data;
1941 uint8_t *buf_end, *buf_ptr;
1943 AVFrame *picture = data;
1946 buf_end = buf + buf_size;
1947 while (buf_ptr < buf_end) {
1948 /* find start next marker */
1949 start_code = find_marker(&buf_ptr, buf_end);
1952 if (start_code < 0) {
1955 av_log(avctx, AV_LOG_DEBUG, "marker=%x avail_size_in_buf=%d\n", start_code, buf_end - buf_ptr);
1957 if ((buf_end - buf_ptr) > s->buffer_size)
1960 s->buffer_size = buf_end-buf_ptr;
1961 s->buffer = av_malloc(s->buffer_size + FF_INPUT_BUFFER_PADDING_SIZE);
1962 av_log(avctx, AV_LOG_DEBUG, "buffer too small, expanding to %d bytes\n",
1966 /* unescape buffer of SOS, use special treatment for JPEG-LS */
1967 if (start_code == SOS && !s->ls)
1969 uint8_t *src = buf_ptr;
1970 uint8_t *dst = s->buffer;
1974 uint8_t x = *(src++);
1977 if (avctx->codec_id != CODEC_ID_THP)
1980 while (src < buf_end && x == 0xff)
1983 if (x >= 0xd0 && x <= 0xd7)
1990 init_get_bits(&s->gb, s->buffer, (dst - s->buffer)*8);
1992 av_log(avctx, AV_LOG_DEBUG, "escaping removed %d bytes\n",
1993 (buf_end - buf_ptr) - (dst - s->buffer));
1995 else if(start_code == SOS && s->ls){
1996 uint8_t *src = buf_ptr;
1997 uint8_t *dst = s->buffer;
2005 while (src + t < buf_end){
2006 uint8_t x = src[t++];
2008 while((src + t < buf_end) && x == 0xff)
2018 init_put_bits(&pb, dst, t);
2020 /* unescape bitstream */
2022 uint8_t x = src[b++];
2023 put_bits(&pb, 8, x);
2026 put_bits(&pb, 7, x);
2030 flush_put_bits(&pb);
2032 init_get_bits(&s->gb, dst, bit_count);
2035 init_get_bits(&s->gb, buf_ptr, (buf_end - buf_ptr)*8);
2037 s->start_code = start_code;
2038 if(s->avctx->debug & FF_DEBUG_STARTCODE){
2039 av_log(avctx, AV_LOG_DEBUG, "startcode: %X\n", start_code);
2042 /* process markers */
2043 if (start_code >= 0xd0 && start_code <= 0xd7) {
2044 av_log(avctx, AV_LOG_DEBUG, "restart marker: %d\n", start_code&0x0f);
2046 } else if (start_code >= APP0 && start_code <= APP15) {
2047 mjpeg_decode_app(s);
2049 } else if (start_code == COM){
2050 mjpeg_decode_com(s);
2053 switch(start_code) {
2055 s->restart_interval = 0;
2057 s->restart_count = 0;
2058 /* nothing to do on SOI */
2061 mjpeg_decode_dqt(s);
2064 if(mjpeg_decode_dht(s) < 0){
2065 av_log(avctx, AV_LOG_ERROR, "huffman table decode error\n");
2073 if (mjpeg_decode_sof(s) < 0)
2080 if (mjpeg_decode_sof(s) < 0)
2087 if (mjpeg_decode_sof(s) < 0)
2094 if (mjpeg_decode_sof(s) < 0)
2098 if (decode_lse(s) < 0)
2103 if ((s->buggy_avid && !s->interlaced) || s->restart_interval)
2107 if (s->interlaced) {
2108 s->bottom_field ^= 1;
2109 /* if not bottom field, do not output image yet */
2110 if (s->bottom_field == !s->interlace_polarity)
2113 *picture = s->picture;
2114 *data_size = sizeof(AVFrame);
2117 picture->quality= FFMAX(FFMAX(s->qscale[0], s->qscale[1]), s->qscale[2]);
2118 picture->qstride= 0;
2119 picture->qscale_table= s->qscale_table;
2120 memset(picture->qscale_table, picture->quality, (s->width+15)/16);
2121 if(avctx->debug & FF_DEBUG_QP)
2122 av_log(avctx, AV_LOG_DEBUG, "QP: %d\n", picture->quality);
2123 picture->quality*= FF_QP2LAMBDA;
2130 mjpeg_decode_sos(s);
2131 /* buggy avid puts EOI every 10-20th frame */
2132 /* if restart period is over process EOI */
2133 if ((s->buggy_avid && !s->interlaced) || s->restart_interval)
2137 mjpeg_decode_dri(s);
2150 av_log(avctx, AV_LOG_ERROR, "mjpeg: unsupported coding type (%x)\n", start_code);
2153 // printf("mjpeg: unsupported marker (%x)\n", start_code);
2158 /* eof process start code */
2159 buf_ptr += (get_bits_count(&s->gb)+7)/8;
2160 av_log(avctx, AV_LOG_DEBUG, "marker parser used %d bytes (%d bits)\n",
2161 (get_bits_count(&s->gb)+7)/8, get_bits_count(&s->gb));
2166 av_log(avctx, AV_LOG_DEBUG, "mjpeg decode frame unused %d bytes\n", buf_end - buf_ptr);
2167 // return buf_end - buf_ptr;
2168 return buf_ptr - buf;
2171 static int mjpegb_decode_frame(AVCodecContext *avctx,
2172 void *data, int *data_size,
2173 uint8_t *buf, int buf_size)
2175 MJpegDecodeContext *s = avctx->priv_data;
2176 uint8_t *buf_end, *buf_ptr;
2177 AVFrame *picture = data;
2178 GetBitContext hgb; /* for the header */
2179 uint32_t dqt_offs, dht_offs, sof_offs, sos_offs, second_field_offs;
2180 uint32_t field_size, sod_offs;
2183 buf_end = buf + buf_size;
2186 /* reset on every SOI */
2187 s->restart_interval = 0;
2188 s->restart_count = 0;
2189 s->mjpb_skiptosod = 0;
2191 init_get_bits(&hgb, buf_ptr, /*buf_size*/(buf_end - buf_ptr)*8);
2193 skip_bits(&hgb, 32); /* reserved zeros */
2195 if (get_bits_long(&hgb, 32) != MKBETAG('m','j','p','g'))
2197 av_log(avctx, AV_LOG_WARNING, "not mjpeg-b (bad fourcc)\n");
2201 field_size = get_bits_long(&hgb, 32); /* field size */
2202 av_log(avctx, AV_LOG_DEBUG, "field size: 0x%x\n", field_size);
2203 skip_bits(&hgb, 32); /* padded field size */
2204 second_field_offs = get_bits_long(&hgb, 32);
2205 av_log(avctx, AV_LOG_DEBUG, "second field offs: 0x%x\n", second_field_offs);
2207 dqt_offs = get_bits_long(&hgb, 32);
2208 av_log(avctx, AV_LOG_DEBUG, "dqt offs: 0x%x\n", dqt_offs);
2211 init_get_bits(&s->gb, buf+dqt_offs, (buf_end - (buf+dqt_offs))*8);
2212 s->start_code = DQT;
2213 mjpeg_decode_dqt(s);
2216 dht_offs = get_bits_long(&hgb, 32);
2217 av_log(avctx, AV_LOG_DEBUG, "dht offs: 0x%x\n", dht_offs);
2220 init_get_bits(&s->gb, buf+dht_offs, (buf_end - (buf+dht_offs))*8);
2221 s->start_code = DHT;
2222 mjpeg_decode_dht(s);
2225 sof_offs = get_bits_long(&hgb, 32);
2226 av_log(avctx, AV_LOG_DEBUG, "sof offs: 0x%x\n", sof_offs);
2229 init_get_bits(&s->gb, buf+sof_offs, (buf_end - (buf+sof_offs))*8);
2230 s->start_code = SOF0;
2231 if (mjpeg_decode_sof(s) < 0)
2235 sos_offs = get_bits_long(&hgb, 32);
2236 av_log(avctx, AV_LOG_DEBUG, "sos offs: 0x%x\n", sos_offs);
2237 sod_offs = get_bits_long(&hgb, 32);
2238 av_log(avctx, AV_LOG_DEBUG, "sod offs: 0x%x\n", sod_offs);
2241 // init_get_bits(&s->gb, buf+sos_offs, (buf_end - (buf+sos_offs))*8);
2242 init_get_bits(&s->gb, buf+sos_offs, field_size*8);
2243 s->mjpb_skiptosod = (sod_offs - sos_offs - show_bits(&s->gb, 16));
2244 s->start_code = SOS;
2245 mjpeg_decode_sos(s);
2248 if (s->interlaced) {
2249 s->bottom_field ^= 1;
2250 /* if not bottom field, do not output image yet */
2251 if (s->bottom_field && second_field_offs)
2253 buf_ptr = buf + second_field_offs;
2254 second_field_offs = 0;
2259 //XXX FIXME factorize, this looks very similar to the EOI code
2261 *picture= s->picture;
2262 *data_size = sizeof(AVFrame);
2265 picture->quality= FFMAX(FFMAX(s->qscale[0], s->qscale[1]), s->qscale[2]);
2266 picture->qstride= 0;
2267 picture->qscale_table= s->qscale_table;
2268 memset(picture->qscale_table, picture->quality, (s->width+15)/16);
2269 if(avctx->debug & FF_DEBUG_QP)
2270 av_log(avctx, AV_LOG_DEBUG, "QP: %d\n", picture->quality);
2271 picture->quality*= FF_QP2LAMBDA;
2274 return buf_ptr - buf;
2279 static int sp5x_decode_frame(AVCodecContext *avctx,
2280 void *data, int *data_size,
2281 uint8_t *buf, int buf_size)
2284 MJpegDecodeContext *s = avctx->priv_data;
2286 const int qscale = 5;
2287 uint8_t *buf_ptr, *buf_end, *recoded;
2290 if (!avctx->width || !avctx->height)
2294 buf_end = buf + buf_size;
2297 recoded = av_mallocz(buf_size + 1024);
2302 recoded[j++] = 0xFF;
2303 recoded[j++] = 0xD8;
2305 memcpy(recoded+j, &sp5x_data_dqt[0], sizeof(sp5x_data_dqt));
2306 memcpy(recoded+j+5, &sp5x_quant_table[qscale * 2], 64);
2307 memcpy(recoded+j+70, &sp5x_quant_table[(qscale * 2) + 1], 64);
2308 j += sizeof(sp5x_data_dqt);
2310 memcpy(recoded+j, &sp5x_data_dht[0], sizeof(sp5x_data_dht));
2311 j += sizeof(sp5x_data_dht);
2313 memcpy(recoded+j, &sp5x_data_sof[0], sizeof(sp5x_data_sof));
2314 recoded[j+5] = (avctx->coded_height >> 8) & 0xFF;
2315 recoded[j+6] = avctx->coded_height & 0xFF;
2316 recoded[j+7] = (avctx->coded_width >> 8) & 0xFF;
2317 recoded[j+8] = avctx->coded_width & 0xFF;
2318 j += sizeof(sp5x_data_sof);
2320 memcpy(recoded+j, &sp5x_data_sos[0], sizeof(sp5x_data_sos));
2321 j += sizeof(sp5x_data_sos);
2323 for (i = 14; i < buf_size && j < buf_size+1024-2; i++)
2325 recoded[j++] = buf[i];
2331 recoded[j++] = 0xFF;
2332 recoded[j++] = 0xD9;
2334 i = mjpeg_decode_frame(avctx, data, data_size, recoded, j);
2341 s->width = avctx->coded_width;
2342 s->height = avctx->coded_height;
2343 s->nb_components = 3;
2344 s->component_id[0] = 0;
2347 s->quant_index[0] = 0;
2348 s->component_id[1] = 1;
2351 s->quant_index[1] = 1;
2352 s->component_id[2] = 2;
2355 s->quant_index[2] = 1;
2359 s->qscale_table = av_mallocz((s->width+15)/16);
2360 avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV420P : PIX_FMT_YUVJ420;
2363 s->picture.reference = 0;
2364 if (avctx->get_buffer(avctx, &s->picture) < 0)
2366 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
2370 s->picture.pict_type = I_TYPE;
2371 s->picture.key_frame = 1;
2373 for (i = 0; i < 3; i++)
2374 s->linesize[i] = s->picture.linesize[i] << s->interlaced;
2377 for (i = 0; i < 64; i++)
2379 j = s->scantable.permutated[i];
2380 s->quant_matrixes[0][j] = sp5x_quant_table[(qscale * 2) + i];
2382 s->qscale[0] = FFMAX(
2383 s->quant_matrixes[0][s->scantable.permutated[1]],
2384 s->quant_matrixes[0][s->scantable.permutated[8]]) >> 1;
2386 for (i = 0; i < 64; i++)
2388 j = s->scantable.permutated[i];
2389 s->quant_matrixes[1][j] = sp5x_quant_table[(qscale * 2) + 1 + i];
2391 s->qscale[1] = FFMAX(
2392 s->quant_matrixes[1][s->scantable.permutated[1]],
2393 s->quant_matrixes[1][s->scantable.permutated[8]]) >> 1;
2398 s->comp_index[0] = 0;
2399 s->nb_blocks[0] = s->h_count[0] * s->v_count[0];
2400 s->h_scount[0] = s->h_count[0];
2401 s->v_scount[0] = s->v_count[0];
2405 s->comp_index[1] = 1;
2406 s->nb_blocks[1] = s->h_count[1] * s->v_count[1];
2407 s->h_scount[1] = s->h_count[1];
2408 s->v_scount[1] = s->v_count[1];
2412 s->comp_index[2] = 2;
2413 s->nb_blocks[2] = s->h_count[2] * s->v_count[2];
2414 s->h_scount[2] = s->h_count[2];
2415 s->v_scount[2] = s->v_count[2];
2419 for (i = 0; i < 3; i++)
2420 s->last_dc[i] = 1024;
2422 s->mb_width = (s->width * s->h_max * 8 -1) / (s->h_max * 8);
2423 s->mb_height = (s->height * s->v_max * 8 -1) / (s->v_max * 8);
2425 init_get_bits(&s->gb, buf+14, (buf_size-14)*8);
2427 return mjpeg_decode_scan(s);
2433 static int mjpeg_decode_end(AVCodecContext *avctx)
2435 MJpegDecodeContext *s = avctx->priv_data;
2439 av_free(s->qscale_table);
2443 free_vlc(&s->vlcs[i][j]);
2448 static int mjpega_dump_header(AVBitStreamFilterContext *bsfc, AVCodecContext *avctx, const char *args,
2449 uint8_t **poutbuf, int *poutbuf_size,
2450 const uint8_t *buf, int buf_size, int keyframe)
2455 if (avctx->codec_id != CODEC_ID_MJPEG) {
2456 av_log(avctx, AV_LOG_ERROR, "mjpega bitstream filter only applies to mjpeg codec\n");
2461 *poutbuf = av_malloc(buf_size + 44 + FF_INPUT_BUFFER_PADDING_SIZE);
2462 poutbufp = *poutbuf;
2463 bytestream_put_byte(&poutbufp, 0xff);
2464 bytestream_put_byte(&poutbufp, SOI);
2465 bytestream_put_byte(&poutbufp, 0xff);
2466 bytestream_put_byte(&poutbufp, APP1);
2467 bytestream_put_be16(&poutbufp, 42); /* size */
2468 bytestream_put_be32(&poutbufp, 0);
2469 bytestream_put_buffer(&poutbufp, "mjpg", 4);
2470 bytestream_put_be32(&poutbufp, buf_size + 44); /* field size */
2471 bytestream_put_be32(&poutbufp, buf_size + 44); /* pad field size */
2472 bytestream_put_be32(&poutbufp, 0); /* next ptr */
2474 for (i = 0; i < buf_size - 1; i++) {
2475 if (buf[i] == 0xff) {
2476 switch (buf[i + 1]) {
2477 case DQT: /* quant off */
2478 case DHT: /* huff off */
2479 case SOF0: /* image off */
2480 bytestream_put_be32(&poutbufp, i + 46);
2483 bytestream_put_be32(&poutbufp, i + 46); /* scan off */
2484 bytestream_put_be32(&poutbufp, i + 46 + AV_RB16(buf + i + 2)); /* data off */
2485 bytestream_put_buffer(&poutbufp, buf + 2, buf_size - 2); /* skip already written SOI */
2486 *poutbuf_size = poutbufp - *poutbuf;
2489 if (i + 8 < buf_size && AV_RL32(buf + i + 8) == ff_get_fourcc("mjpg")) {
2490 av_log(avctx, AV_LOG_ERROR, "bitstream already formatted\n");
2491 memcpy(*poutbuf, buf, buf_size);
2492 *poutbuf_size = buf_size;
2499 av_log(avctx, AV_LOG_ERROR, "could not find SOS marker in bitstream\n");
2503 AVCodec mjpeg_decoder = {
2507 sizeof(MJpegDecodeContext),
2516 AVCodec thp_decoder = {
2520 sizeof(MJpegDecodeContext),
2529 AVCodec mjpegb_decoder = {
2533 sizeof(MJpegDecodeContext),
2537 mjpegb_decode_frame,
2542 AVCodec sp5x_decoder = {
2546 sizeof(MJpegDecodeContext),
2555 #ifdef CONFIG_ENCODERS
2556 AVCodec ljpeg_encoder = { //FIXME avoid MPV_* lossless jpeg shouldnt need them
2560 sizeof(MpegEncContext),
2562 encode_picture_lossless,
2567 AVBitStreamFilter mjpega_dump_header_bsf = {