• Home
  • Line#
  • Scopes#
  • Navigate#
  • Raw
  • Download
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/pixdesc.h"
27 #include "libavutil/pixfmt.h"
28 
29 #include "avcodec.h"
30 #include "idctdsp.h"
31 #include "jpegtables.h"
32 #include "put_bits.h"
33 #include "mjpegenc.h"
34 #include "mjpegenc_common.h"
35 #include "mjpeg.h"
36 
37 /* table_class: 0 = DC coef, 1 = AC coefs */
put_huffman_table(PutBitContext * p,int table_class,int table_id,const uint8_t * bits_table,const uint8_t * value_table)38 static int put_huffman_table(PutBitContext *p, int table_class, int table_id,
39                              const uint8_t *bits_table, const uint8_t *value_table)
40 {
41     int n, i;
42 
43     put_bits(p, 4, table_class);
44     put_bits(p, 4, table_id);
45 
46     n = 0;
47     for(i=1;i<=16;i++) {
48         n += bits_table[i];
49         put_bits(p, 8, bits_table[i]);
50     }
51 
52     for(i=0;i<n;i++)
53         put_bits(p, 8, value_table[i]);
54 
55     return n + 17;
56 }
57 
jpeg_table_header(AVCodecContext * avctx,PutBitContext * p,ScanTable * intra_scantable,uint16_t luma_intra_matrix[64],uint16_t chroma_intra_matrix[64],int hsample[3])58 static void jpeg_table_header(AVCodecContext *avctx, PutBitContext *p,
59                               ScanTable *intra_scantable,
60                               uint16_t luma_intra_matrix[64],
61                               uint16_t chroma_intra_matrix[64],
62                               int hsample[3])
63 {
64     int i, j, size;
65     uint8_t *ptr;
66     MpegEncContext *s = NULL;
67 
68     /* Since avctx->priv_data will point to LJpegEncContext in this case */
69     if (avctx->codec_id != AV_CODEC_ID_LJPEG)
70         s = avctx->priv_data;
71 
72     if (avctx->codec_id != AV_CODEC_ID_LJPEG) {
73         int matrix_count = 1 + !!memcmp(luma_intra_matrix,
74                                         chroma_intra_matrix,
75                                         sizeof(luma_intra_matrix[0]) * 64);
76     if (s && s->force_duplicated_matrix)
77         matrix_count = 2;
78     /* quant matrixes */
79     put_marker(p, DQT);
80     put_bits(p, 16, 2 + matrix_count * (1 + 64));
81     put_bits(p, 4, 0); /* 8 bit precision */
82     put_bits(p, 4, 0); /* table 0 */
83     for(i=0;i<64;i++) {
84         j = intra_scantable->permutated[i];
85         put_bits(p, 8, luma_intra_matrix[j]);
86     }
87 
88         if (matrix_count > 1) {
89             put_bits(p, 4, 0); /* 8 bit precision */
90             put_bits(p, 4, 1); /* table 1 */
91             for(i=0;i<64;i++) {
92                 j = intra_scantable->permutated[i];
93                 put_bits(p, 8, chroma_intra_matrix[j]);
94             }
95         }
96     }
97 
98     if(avctx->active_thread_type & FF_THREAD_SLICE){
99         put_marker(p, DRI);
100         put_bits(p, 16, 4);
101         put_bits(p, 16, (avctx->width-1)/(8*hsample[0]) + 1);
102     }
103 
104     /* huffman table */
105     put_marker(p, DHT);
106     flush_put_bits(p);
107     ptr = put_bits_ptr(p);
108     put_bits(p, 16, 0); /* patched later */
109     size = 2;
110 
111     // Only MJPEG can have a variable Huffman variable. All other
112     // formats use the default Huffman table.
113     if (s && s->huffman == HUFFMAN_TABLE_OPTIMAL) {
114         size += put_huffman_table(p, 0, 0, s->mjpeg_ctx->bits_dc_luminance,
115                                   s->mjpeg_ctx->val_dc_luminance);
116         size += put_huffman_table(p, 0, 1, s->mjpeg_ctx->bits_dc_chrominance,
117                                   s->mjpeg_ctx->val_dc_chrominance);
118 
119         size += put_huffman_table(p, 1, 0, s->mjpeg_ctx->bits_ac_luminance,
120                                   s->mjpeg_ctx->val_ac_luminance);
121         size += put_huffman_table(p, 1, 1, s->mjpeg_ctx->bits_ac_chrominance,
122                                   s->mjpeg_ctx->val_ac_chrominance);
123     } else {
124         size += put_huffman_table(p, 0, 0, avpriv_mjpeg_bits_dc_luminance,
125                                   avpriv_mjpeg_val_dc);
126         size += put_huffman_table(p, 0, 1, avpriv_mjpeg_bits_dc_chrominance,
127                                   avpriv_mjpeg_val_dc);
128 
129         size += put_huffman_table(p, 1, 0, avpriv_mjpeg_bits_ac_luminance,
130                                   avpriv_mjpeg_val_ac_luminance);
131         size += put_huffman_table(p, 1, 1, avpriv_mjpeg_bits_ac_chrominance,
132                                   avpriv_mjpeg_val_ac_chrominance);
133     }
134     AV_WB16(ptr, size);
135 }
136 
jpeg_put_comments(AVCodecContext * avctx,PutBitContext * p)137 static void jpeg_put_comments(AVCodecContext *avctx, PutBitContext *p)
138 {
139     int size;
140     uint8_t *ptr;
141 
142     if (avctx->sample_aspect_ratio.num > 0 && avctx->sample_aspect_ratio.den > 0) {
143         AVRational sar = avctx->sample_aspect_ratio;
144 
145         if (sar.num > 65535 || sar.den > 65535) {
146             if (!av_reduce(&sar.num, &sar.den, avctx->sample_aspect_ratio.num, avctx->sample_aspect_ratio.den, 65535))
147                 av_log(avctx, AV_LOG_WARNING,
148                     "Cannot store exact aspect ratio %d:%d\n",
149                     avctx->sample_aspect_ratio.num,
150                     avctx->sample_aspect_ratio.den);
151         }
152 
153         /* JFIF header */
154         put_marker(p, APP0);
155         put_bits(p, 16, 16);
156         ff_put_string(p, "JFIF", 1); /* this puts the trailing zero-byte too */
157         /* The most significant byte is used for major revisions, the least
158          * significant byte for minor revisions. Version 1.02 is the current
159          * released revision. */
160         put_bits(p, 16, 0x0102);
161         put_bits(p,  8, 0);              /* units type: 0 - aspect ratio */
162         put_bits(p, 16, sar.num);
163         put_bits(p, 16, sar.den);
164         put_bits(p, 8, 0); /* thumbnail width */
165         put_bits(p, 8, 0); /* thumbnail height */
166     }
167 
168     /* comment */
169     if (!(avctx->flags & AV_CODEC_FLAG_BITEXACT)) {
170         put_marker(p, COM);
171         flush_put_bits(p);
172         ptr = put_bits_ptr(p);
173         put_bits(p, 16, 0); /* patched later */
174         ff_put_string(p, LIBAVCODEC_IDENT, 1);
175         size = strlen(LIBAVCODEC_IDENT)+3;
176         AV_WB16(ptr, size);
177     }
178 
179     if (((avctx->pix_fmt == AV_PIX_FMT_YUV420P ||
180           avctx->pix_fmt == AV_PIX_FMT_YUV422P ||
181           avctx->pix_fmt == AV_PIX_FMT_YUV444P) && avctx->color_range != AVCOL_RANGE_JPEG)
182         || avctx->color_range == AVCOL_RANGE_MPEG) {
183         put_marker(p, COM);
184         flush_put_bits(p);
185         ptr = put_bits_ptr(p);
186         put_bits(p, 16, 0); /* patched later */
187         ff_put_string(p, "CS=ITU601", 1);
188         size = strlen("CS=ITU601")+3;
189         AV_WB16(ptr, size);
190     }
191 }
192 
ff_mjpeg_init_hvsample(AVCodecContext * avctx,int hsample[4],int vsample[4])193 void ff_mjpeg_init_hvsample(AVCodecContext *avctx, int hsample[4], int vsample[4])
194 {
195     int chroma_h_shift, chroma_v_shift;
196 
197     av_pix_fmt_get_chroma_sub_sample(avctx->pix_fmt, &chroma_h_shift,
198                                      &chroma_v_shift);
199     if (avctx->codec->id == AV_CODEC_ID_LJPEG &&
200         (   avctx->pix_fmt == AV_PIX_FMT_BGR0
201          || avctx->pix_fmt == AV_PIX_FMT_BGRA
202          || avctx->pix_fmt == AV_PIX_FMT_BGR24)) {
203         vsample[0] = hsample[0] =
204         vsample[1] = hsample[1] =
205         vsample[2] = hsample[2] =
206         vsample[3] = hsample[3] = 1;
207     } else if (avctx->pix_fmt == AV_PIX_FMT_YUV444P || avctx->pix_fmt == AV_PIX_FMT_YUVJ444P) {
208         vsample[0] = vsample[1] = vsample[2] = 2;
209         hsample[0] = hsample[1] = hsample[2] = 1;
210     } else {
211         vsample[0] = 2;
212         vsample[1] = 2 >> chroma_v_shift;
213         vsample[2] = 2 >> chroma_v_shift;
214         hsample[0] = 2;
215         hsample[1] = 2 >> chroma_h_shift;
216         hsample[2] = 2 >> chroma_h_shift;
217     }
218 }
219 
ff_mjpeg_encode_picture_header(AVCodecContext * avctx,PutBitContext * pb,ScanTable * intra_scantable,int pred,uint16_t luma_intra_matrix[64],uint16_t chroma_intra_matrix[64])220 void ff_mjpeg_encode_picture_header(AVCodecContext *avctx, PutBitContext *pb,
221                                     ScanTable *intra_scantable, int pred,
222                                     uint16_t luma_intra_matrix[64],
223                                     uint16_t chroma_intra_matrix[64])
224 {
225     const int lossless = avctx->codec_id != AV_CODEC_ID_MJPEG && avctx->codec_id != AV_CODEC_ID_AMV;
226     int hsample[4], vsample[4];
227     int i;
228     int components = 3 + (avctx->pix_fmt == AV_PIX_FMT_BGRA);
229     int chroma_matrix = !!memcmp(luma_intra_matrix,
230                                  chroma_intra_matrix,
231                                  sizeof(luma_intra_matrix[0])*64);
232 
233     ff_mjpeg_init_hvsample(avctx, hsample, vsample);
234 
235     put_marker(pb, SOI);
236 
237     // hack for AMV mjpeg format
238     if(avctx->codec_id == AV_CODEC_ID_AMV) goto end;
239 
240     jpeg_put_comments(avctx, pb);
241 
242     jpeg_table_header(avctx, pb, intra_scantable, luma_intra_matrix, chroma_intra_matrix, hsample);
243 
244     switch (avctx->codec_id) {
245     case AV_CODEC_ID_MJPEG:  put_marker(pb, SOF0 ); break;
246     case AV_CODEC_ID_LJPEG:  put_marker(pb, SOF3 ); break;
247     default: av_assert0(0);
248     }
249 
250     put_bits(pb, 16, 17);
251     if (lossless && (  avctx->pix_fmt == AV_PIX_FMT_BGR0
252                     || avctx->pix_fmt == AV_PIX_FMT_BGRA
253                     || avctx->pix_fmt == AV_PIX_FMT_BGR24))
254         put_bits(pb, 8, 9); /* 9 bits/component RCT */
255     else
256         put_bits(pb, 8, 8); /* 8 bits/component */
257     put_bits(pb, 16, avctx->height);
258     put_bits(pb, 16, avctx->width);
259     put_bits(pb, 8, components); /* 3 or 4 components */
260 
261     /* Y component */
262     put_bits(pb, 8, 1); /* component number */
263     put_bits(pb, 4, hsample[0]); /* H factor */
264     put_bits(pb, 4, vsample[0]); /* V factor */
265     put_bits(pb, 8, 0); /* select matrix */
266 
267     /* Cb component */
268     put_bits(pb, 8, 2); /* component number */
269     put_bits(pb, 4, hsample[1]); /* H factor */
270     put_bits(pb, 4, vsample[1]); /* V factor */
271     put_bits(pb, 8, lossless ? 0 : chroma_matrix); /* select matrix */
272 
273     /* Cr component */
274     put_bits(pb, 8, 3); /* component number */
275     put_bits(pb, 4, hsample[2]); /* H factor */
276     put_bits(pb, 4, vsample[2]); /* V factor */
277     put_bits(pb, 8, lossless ? 0 : chroma_matrix); /* select matrix */
278 
279     if (components == 4) {
280         put_bits(pb, 8, 4); /* component number */
281         put_bits(pb, 4, hsample[3]); /* H factor */
282         put_bits(pb, 4, vsample[3]); /* V factor */
283         put_bits(pb, 8, 0); /* select matrix */
284     }
285 
286     /* scan header */
287     put_marker(pb, SOS);
288     put_bits(pb, 16, 6 + 2*components); /* length */
289     put_bits(pb, 8, components); /* 3 components */
290 
291     /* Y component */
292     put_bits(pb, 8, 1); /* index */
293     put_bits(pb, 4, 0); /* DC huffman table index */
294     put_bits(pb, 4, 0); /* AC huffman table index */
295 
296     /* Cb component */
297     put_bits(pb, 8, 2); /* index */
298     put_bits(pb, 4, 1); /* DC huffman table index */
299     put_bits(pb, 4, lossless ? 0 : 1); /* AC huffman table index */
300 
301     /* Cr component */
302     put_bits(pb, 8, 3); /* index */
303     put_bits(pb, 4, 1); /* DC huffman table index */
304     put_bits(pb, 4, lossless ? 0 : 1); /* AC huffman table index */
305 
306     if (components == 4) {
307         /* Alpha component */
308         put_bits(pb, 8, 4); /* index */
309         put_bits(pb, 4, 0); /* DC huffman table index */
310         put_bits(pb, 4, 0); /* AC huffman table index */
311     }
312 
313     put_bits(pb, 8, lossless ? pred : 0); /* Ss (not used) */
314 
315     switch (avctx->codec_id) {
316     case AV_CODEC_ID_MJPEG:  put_bits(pb, 8, 63); break; /* Se (not used) */
317     case AV_CODEC_ID_LJPEG:  put_bits(pb, 8,  0); break; /* not used */
318     default: av_assert0(0);
319     }
320 
321     put_bits(pb, 8, 0); /* Ah/Al (not used) */
322 
323 end:
324     if (!lossless) {
325         MpegEncContext *s = avctx->priv_data;
326         av_assert0(avctx->codec->priv_data_size == sizeof(MpegEncContext));
327 
328         s->esc_pos = put_bits_count(pb) >> 3;
329         for(i=1; i<s->slice_context_count; i++)
330             s->thread_context[i]->esc_pos = 0;
331     }
332 }
333 
ff_mjpeg_escape_FF(PutBitContext * pb,int start)334 void ff_mjpeg_escape_FF(PutBitContext *pb, int start)
335 {
336     int size;
337     int i, ff_count;
338     uint8_t *buf = pb->buf + start;
339     int align= (-(size_t)(buf))&3;
340     int pad = (-put_bits_count(pb))&7;
341 
342     if (pad)
343         put_bits(pb, pad, (1<<pad)-1);
344 
345     flush_put_bits(pb);
346     size = put_bits_count(pb) - start * 8;
347 
348     av_assert1((size&7) == 0);
349     size >>= 3;
350 
351     ff_count=0;
352     for(i=0; i<size && i<align; i++){
353         if(buf[i]==0xFF) ff_count++;
354     }
355     for(; i<size-15; i+=16){
356         int acc, v;
357 
358         v= *(uint32_t*)(&buf[i]);
359         acc= (((v & (v>>4))&0x0F0F0F0F)+0x01010101)&0x10101010;
360         v= *(uint32_t*)(&buf[i+4]);
361         acc+=(((v & (v>>4))&0x0F0F0F0F)+0x01010101)&0x10101010;
362         v= *(uint32_t*)(&buf[i+8]);
363         acc+=(((v & (v>>4))&0x0F0F0F0F)+0x01010101)&0x10101010;
364         v= *(uint32_t*)(&buf[i+12]);
365         acc+=(((v & (v>>4))&0x0F0F0F0F)+0x01010101)&0x10101010;
366 
367         acc>>=4;
368         acc+= (acc>>16);
369         acc+= (acc>>8);
370         ff_count+= acc&0xFF;
371     }
372     for(; i<size; i++){
373         if(buf[i]==0xFF) ff_count++;
374     }
375 
376     if(ff_count==0) return;
377 
378     flush_put_bits(pb);
379     skip_put_bytes(pb, ff_count);
380 
381     for(i=size-1; ff_count; i--){
382         int v= buf[i];
383 
384         if(v==0xFF){
385             buf[i+ff_count]= 0;
386             ff_count--;
387         }
388 
389         buf[i+ff_count]= v;
390     }
391 }
392 
393 /* isn't this function nicer than the one in the libjpeg ? */
ff_mjpeg_build_huffman_codes(uint8_t * huff_size,uint16_t * huff_code,const uint8_t * bits_table,const uint8_t * val_table)394 void ff_mjpeg_build_huffman_codes(uint8_t *huff_size, uint16_t *huff_code,
395                                   const uint8_t *bits_table,
396                                   const uint8_t *val_table)
397 {
398     int k, code;
399 
400     k = 0;
401     code = 0;
402     for (int i = 1; i <= 16; i++) {
403         int nb = bits_table[i];
404         for (int j = 0; j < nb; j++) {
405             int sym = val_table[k++];
406             huff_size[sym] = i;
407             huff_code[sym] = code;
408             code++;
409         }
410         code <<= 1;
411     }
412 }
413 
ff_mjpeg_encode_picture_trailer(PutBitContext * pb,int header_bits)414 void ff_mjpeg_encode_picture_trailer(PutBitContext *pb, int header_bits)
415 {
416     av_assert1((header_bits & 7) == 0);
417 
418     put_marker(pb, EOI);
419 }
420 
ff_mjpeg_encode_dc(PutBitContext * pb,int val,uint8_t * huff_size,uint16_t * huff_code)421 void ff_mjpeg_encode_dc(PutBitContext *pb, int val,
422                         uint8_t *huff_size, uint16_t *huff_code)
423 {
424     int mant, nbits;
425 
426     if (val == 0) {
427         put_bits(pb, huff_size[0], huff_code[0]);
428     } else {
429         mant = val;
430         if (val < 0) {
431             val = -val;
432             mant--;
433         }
434 
435         nbits= av_log2_16bit(val) + 1;
436 
437         put_bits(pb, huff_size[nbits], huff_code[nbits]);
438 
439         put_sbits(pb, nbits, mant);
440     }
441 }
442