Add ff_ prefix to data symbols of encoders, decoders, hwaccel, parsers, bsf.
[libav.git] / libavcodec / mjpegenc.c
1 /*
2 * MJPEG encoder
3 * Copyright (c) 2000, 2001 Fabrice Bellard
4 * Copyright (c) 2003 Alex Beregszaszi
5 * Copyright (c) 2003-2004 Michael Niedermayer
6 *
7 * Support for external huffman table, various fixes (AVID workaround),
8 * aspecting, new decode_frame mechanism and apple mjpeg-b support
9 * by Alex Beregszaszi
10 *
11 * This file is part of FFmpeg.
12 *
13 * FFmpeg is free software; you can redistribute it and/or
14 * modify it under the terms of the GNU Lesser General Public
15 * License as published by the Free Software Foundation; either
16 * version 2.1 of the License, or (at your option) any later version.
17 *
18 * FFmpeg is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
21 * Lesser General Public License for more details.
22 *
23 * You should have received a copy of the GNU Lesser General Public
24 * License along with FFmpeg; if not, write to the Free Software
25 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
26 */
27
28 /**
29 * @file
30 * MJPEG encoder.
31 */
32
33 //#define DEBUG
34 #include <assert.h>
35
36 #include "avcodec.h"
37 #include "dsputil.h"
38 #include "mpegvideo.h"
39 #include "mjpeg.h"
40 #include "mjpegenc.h"
41
42 /* use two quantizer tables (one for luminance and one for chrominance) */
43 /* not yet working */
44 #undef TWOMATRIXES
45
46
47 av_cold int ff_mjpeg_encode_init(MpegEncContext *s)
48 {
49 MJpegContext *m;
50
51 m = av_malloc(sizeof(MJpegContext));
52 if (!m)
53 return -1;
54
55 s->min_qcoeff=-1023;
56 s->max_qcoeff= 1023;
57
58 /* build all the huffman tables */
59 ff_mjpeg_build_huffman_codes(m->huff_size_dc_luminance,
60 m->huff_code_dc_luminance,
61 ff_mjpeg_bits_dc_luminance,
62 ff_mjpeg_val_dc);
63 ff_mjpeg_build_huffman_codes(m->huff_size_dc_chrominance,
64 m->huff_code_dc_chrominance,
65 ff_mjpeg_bits_dc_chrominance,
66 ff_mjpeg_val_dc);
67 ff_mjpeg_build_huffman_codes(m->huff_size_ac_luminance,
68 m->huff_code_ac_luminance,
69 ff_mjpeg_bits_ac_luminance,
70 ff_mjpeg_val_ac_luminance);
71 ff_mjpeg_build_huffman_codes(m->huff_size_ac_chrominance,
72 m->huff_code_ac_chrominance,
73 ff_mjpeg_bits_ac_chrominance,
74 ff_mjpeg_val_ac_chrominance);
75
76 s->mjpeg_ctx = m;
77 return 0;
78 }
79
80 void ff_mjpeg_encode_close(MpegEncContext *s)
81 {
82 av_free(s->mjpeg_ctx);
83 }
84
85 /* table_class: 0 = DC coef, 1 = AC coefs */
86 static int put_huffman_table(MpegEncContext *s, int table_class, int table_id,
87 const uint8_t *bits_table, const uint8_t *value_table)
88 {
89 PutBitContext *p = &s->pb;
90 int n, i;
91
92 put_bits(p, 4, table_class);
93 put_bits(p, 4, table_id);
94
95 n = 0;
96 for(i=1;i<=16;i++) {
97 n += bits_table[i];
98 put_bits(p, 8, bits_table[i]);
99 }
100
101 for(i=0;i<n;i++)
102 put_bits(p, 8, value_table[i]);
103
104 return n + 17;
105 }
106
107 static void jpeg_table_header(MpegEncContext *s)
108 {
109 PutBitContext *p = &s->pb;
110 int i, j, size;
111 uint8_t *ptr;
112
113 /* quant matrixes */
114 put_marker(p, DQT);
115 #ifdef TWOMATRIXES
116 put_bits(p, 16, 2 + 2 * (1 + 64));
117 #else
118 put_bits(p, 16, 2 + 1 * (1 + 64));
119 #endif
120 put_bits(p, 4, 0); /* 8 bit precision */
121 put_bits(p, 4, 0); /* table 0 */
122 for(i=0;i<64;i++) {
123 j = s->intra_scantable.permutated[i];
124 put_bits(p, 8, s->intra_matrix[j]);
125 }
126 #ifdef TWOMATRIXES
127 put_bits(p, 4, 0); /* 8 bit precision */
128 put_bits(p, 4, 1); /* table 1 */
129 for(i=0;i<64;i++) {
130 j = s->intra_scantable.permutated[i];
131 put_bits(p, 8, s->chroma_intra_matrix[j]);
132 }
133 #endif
134
135 /* huffman table */
136 put_marker(p, DHT);
137 flush_put_bits(p);
138 ptr = put_bits_ptr(p);
139 put_bits(p, 16, 0); /* patched later */
140 size = 2;
141 size += put_huffman_table(s, 0, 0, ff_mjpeg_bits_dc_luminance,
142 ff_mjpeg_val_dc);
143 size += put_huffman_table(s, 0, 1, ff_mjpeg_bits_dc_chrominance,
144 ff_mjpeg_val_dc);
145
146 size += put_huffman_table(s, 1, 0, ff_mjpeg_bits_ac_luminance,
147 ff_mjpeg_val_ac_luminance);
148 size += put_huffman_table(s, 1, 1, ff_mjpeg_bits_ac_chrominance,
149 ff_mjpeg_val_ac_chrominance);
150 AV_WB16(ptr, size);
151 }
152
153 static void jpeg_put_comments(MpegEncContext *s)
154 {
155 PutBitContext *p = &s->pb;
156 int size;
157 uint8_t *ptr;
158
159 if (s->aspect_ratio_info /* && !lossless */)
160 {
161 /* JFIF header */
162 put_marker(p, APP0);
163 put_bits(p, 16, 16);
164 ff_put_string(p, "JFIF", 1); /* this puts the trailing zero-byte too */
165 put_bits(p, 16, 0x0201); /* v 1.02 */
166 put_bits(p, 8, 0); /* units type: 0 - aspect ratio */
167 put_bits(p, 16, s->avctx->sample_aspect_ratio.num);
168 put_bits(p, 16, s->avctx->sample_aspect_ratio.den);
169 put_bits(p, 8, 0); /* thumbnail width */
170 put_bits(p, 8, 0); /* thumbnail height */
171 }
172
173 /* comment */
174 if(!(s->flags & CODEC_FLAG_BITEXACT)){
175 put_marker(p, COM);
176 flush_put_bits(p);
177 ptr = put_bits_ptr(p);
178 put_bits(p, 16, 0); /* patched later */
179 ff_put_string(p, LIBAVCODEC_IDENT, 1);
180 size = strlen(LIBAVCODEC_IDENT)+3;
181 AV_WB16(ptr, size);
182 }
183
184 if( s->avctx->pix_fmt == PIX_FMT_YUV420P
185 ||s->avctx->pix_fmt == PIX_FMT_YUV422P
186 ||s->avctx->pix_fmt == PIX_FMT_YUV444P){
187 put_marker(p, COM);
188 flush_put_bits(p);
189 ptr = put_bits_ptr(p);
190 put_bits(p, 16, 0); /* patched later */
191 ff_put_string(p, "CS=ITU601", 1);
192 size = strlen("CS=ITU601")+3;
193 AV_WB16(ptr, size);
194 }
195 }
196
197 void ff_mjpeg_encode_picture_header(MpegEncContext *s)
198 {
199 const int lossless= s->avctx->codec_id != CODEC_ID_MJPEG;
200
201 put_marker(&s->pb, SOI);
202
203 jpeg_put_comments(s);
204
205 jpeg_table_header(s);
206
207 switch(s->avctx->codec_id){
208 case CODEC_ID_MJPEG: put_marker(&s->pb, SOF0 ); break;
209 case CODEC_ID_LJPEG: put_marker(&s->pb, SOF3 ); break;
210 default: assert(0);
211 }
212
213 put_bits(&s->pb, 16, 17);
214 if(lossless && s->avctx->pix_fmt == PIX_FMT_BGRA)
215 put_bits(&s->pb, 8, 9); /* 9 bits/component RCT */
216 else
217 put_bits(&s->pb, 8, 8); /* 8 bits/component */
218 put_bits(&s->pb, 16, s->height);
219 put_bits(&s->pb, 16, s->width);
220 put_bits(&s->pb, 8, 3); /* 3 components */
221
222 /* Y component */
223 put_bits(&s->pb, 8, 1); /* component number */
224 put_bits(&s->pb, 4, s->mjpeg_hsample[0]); /* H factor */
225 put_bits(&s->pb, 4, s->mjpeg_vsample[0]); /* V factor */
226 put_bits(&s->pb, 8, 0); /* select matrix */
227
228 /* Cb component */
229 put_bits(&s->pb, 8, 2); /* component number */
230 put_bits(&s->pb, 4, s->mjpeg_hsample[1]); /* H factor */
231 put_bits(&s->pb, 4, s->mjpeg_vsample[1]); /* V factor */
232 #ifdef TWOMATRIXES
233 put_bits(&s->pb, 8, lossless ? 0 : 1); /* select matrix */
234 #else
235 put_bits(&s->pb, 8, 0); /* select matrix */
236 #endif
237
238 /* Cr component */
239 put_bits(&s->pb, 8, 3); /* component number */
240 put_bits(&s->pb, 4, s->mjpeg_hsample[2]); /* H factor */
241 put_bits(&s->pb, 4, s->mjpeg_vsample[2]); /* V factor */
242 #ifdef TWOMATRIXES
243 put_bits(&s->pb, 8, lossless ? 0 : 1); /* select matrix */
244 #else
245 put_bits(&s->pb, 8, 0); /* select matrix */
246 #endif
247
248 /* scan header */
249 put_marker(&s->pb, SOS);
250 put_bits(&s->pb, 16, 12); /* length */
251 put_bits(&s->pb, 8, 3); /* 3 components */
252
253 /* Y component */
254 put_bits(&s->pb, 8, 1); /* index */
255 put_bits(&s->pb, 4, 0); /* DC huffman table index */
256 put_bits(&s->pb, 4, 0); /* AC huffman table index */
257
258 /* Cb component */
259 put_bits(&s->pb, 8, 2); /* index */
260 put_bits(&s->pb, 4, 1); /* DC huffman table index */
261 put_bits(&s->pb, 4, lossless ? 0 : 1); /* AC huffman table index */
262
263 /* Cr component */
264 put_bits(&s->pb, 8, 3); /* index */
265 put_bits(&s->pb, 4, 1); /* DC huffman table index */
266 put_bits(&s->pb, 4, lossless ? 0 : 1); /* AC huffman table index */
267
268 put_bits(&s->pb, 8, lossless ? s->avctx->prediction_method+1 : 0); /* Ss (not used) */
269
270 switch(s->avctx->codec_id){
271 case CODEC_ID_MJPEG: put_bits(&s->pb, 8, 63); break; /* Se (not used) */
272 case CODEC_ID_LJPEG: put_bits(&s->pb, 8, 0); break; /* not used */
273 default: assert(0);
274 }
275
276 put_bits(&s->pb, 8, 0); /* Ah/Al (not used) */
277 }
278
279 static void escape_FF(MpegEncContext *s, int start)
280 {
281 int size= put_bits_count(&s->pb) - start*8;
282 int i, ff_count;
283 uint8_t *buf= s->pb.buf + start;
284 int align= (-(size_t)(buf))&3;
285
286 assert((size&7) == 0);
287 size >>= 3;
288
289 ff_count=0;
290 for(i=0; i<size && i<align; i++){
291 if(buf[i]==0xFF) ff_count++;
292 }
293 for(; i<size-15; i+=16){
294 int acc, v;
295
296 v= *(uint32_t*)(&buf[i]);
297 acc= (((v & (v>>4))&0x0F0F0F0F)+0x01010101)&0x10101010;
298 v= *(uint32_t*)(&buf[i+4]);
299 acc+=(((v & (v>>4))&0x0F0F0F0F)+0x01010101)&0x10101010;
300 v= *(uint32_t*)(&buf[i+8]);
301 acc+=(((v & (v>>4))&0x0F0F0F0F)+0x01010101)&0x10101010;
302 v= *(uint32_t*)(&buf[i+12]);
303 acc+=(((v & (v>>4))&0x0F0F0F0F)+0x01010101)&0x10101010;
304
305 acc>>=4;
306 acc+= (acc>>16);
307 acc+= (acc>>8);
308 ff_count+= acc&0xFF;
309 }
310 for(; i<size; i++){
311 if(buf[i]==0xFF) ff_count++;
312 }
313
314 if(ff_count==0) return;
315
316 flush_put_bits(&s->pb);
317 skip_put_bytes(&s->pb, ff_count);
318
319 for(i=size-1; ff_count; i--){
320 int v= buf[i];
321
322 if(v==0xFF){
323 //printf("%d %d\n", i, ff_count);
324 buf[i+ff_count]= 0;
325 ff_count--;
326 }
327
328 buf[i+ff_count]= v;
329 }
330 }
331
332 void ff_mjpeg_encode_stuffing(PutBitContext * pbc)
333 {
334 int length;
335 length= (-put_bits_count(pbc))&7;
336 if(length) put_bits(pbc, length, (1<<length)-1);
337 }
338
339 void ff_mjpeg_encode_picture_trailer(MpegEncContext *s)
340 {
341 ff_mjpeg_encode_stuffing(&s->pb);
342 flush_put_bits(&s->pb);
343
344 assert((s->header_bits&7)==0);
345
346 escape_FF(s, s->header_bits>>3);
347
348 put_marker(&s->pb, EOI);
349 }
350
351 void ff_mjpeg_encode_dc(MpegEncContext *s, int val,
352 uint8_t *huff_size, uint16_t *huff_code)
353 {
354 int mant, nbits;
355
356 if (val == 0) {
357 put_bits(&s->pb, huff_size[0], huff_code[0]);
358 } else {
359 mant = val;
360 if (val < 0) {
361 val = -val;
362 mant--;
363 }
364
365 nbits= av_log2_16bit(val) + 1;
366
367 put_bits(&s->pb, huff_size[nbits], huff_code[nbits]);
368
369 put_sbits(&s->pb, nbits, mant);
370 }
371 }
372
373 static void encode_block(MpegEncContext *s, DCTELEM *block, int n)
374 {
375 int mant, nbits, code, i, j;
376 int component, dc, run, last_index, val;
377 MJpegContext *m = s->mjpeg_ctx;
378 uint8_t *huff_size_ac;
379 uint16_t *huff_code_ac;
380
381 /* DC coef */
382 component = (n <= 3 ? 0 : (n&1) + 1);
383 dc = block[0]; /* overflow is impossible */
384 val = dc - s->last_dc[component];
385 if (n < 4) {
386 ff_mjpeg_encode_dc(s, val, m->huff_size_dc_luminance, m->huff_code_dc_luminance);
387 huff_size_ac = m->huff_size_ac_luminance;
388 huff_code_ac = m->huff_code_ac_luminance;
389 } else {
390 ff_mjpeg_encode_dc(s, val, m->huff_size_dc_chrominance, m->huff_code_dc_chrominance);
391 huff_size_ac = m->huff_size_ac_chrominance;
392 huff_code_ac = m->huff_code_ac_chrominance;
393 }
394 s->last_dc[component] = dc;
395
396 /* AC coefs */
397
398 run = 0;
399 last_index = s->block_last_index[n];
400 for(i=1;i<=last_index;i++) {
401 j = s->intra_scantable.permutated[i];
402 val = block[j];
403 if (val == 0) {
404 run++;
405 } else {
406 while (run >= 16) {
407 put_bits(&s->pb, huff_size_ac[0xf0], huff_code_ac[0xf0]);
408 run -= 16;
409 }
410 mant = val;
411 if (val < 0) {
412 val = -val;
413 mant--;
414 }
415
416 nbits= av_log2(val) + 1;
417 code = (run << 4) | nbits;
418
419 put_bits(&s->pb, huff_size_ac[code], huff_code_ac[code]);
420
421 put_sbits(&s->pb, nbits, mant);
422 run = 0;
423 }
424 }
425
426 /* output EOB only if not already 64 values */
427 if (last_index < 63 || run != 0)
428 put_bits(&s->pb, huff_size_ac[0], huff_code_ac[0]);
429 }
430
431 void ff_mjpeg_encode_mb(MpegEncContext *s, DCTELEM block[6][64])
432 {
433 int i;
434 for(i=0;i<5;i++) {
435 encode_block(s, block[i], i);
436 }
437 if (s->chroma_format == CHROMA_420) {
438 encode_block(s, block[5], 5);
439 } else {
440 encode_block(s, block[6], 6);
441 encode_block(s, block[5], 5);
442 encode_block(s, block[7], 7);
443 }
444
445 s->i_tex_bits += get_bits_diff(s);
446 }
447
448 AVCodec ff_mjpeg_encoder = {
449 "mjpeg",
450 AVMEDIA_TYPE_VIDEO,
451 CODEC_ID_MJPEG,
452 sizeof(MpegEncContext),
453 MPV_encode_init,
454 MPV_encode_picture,
455 MPV_encode_end,
456 .pix_fmts= (const enum PixelFormat[]){PIX_FMT_YUVJ420P, PIX_FMT_YUVJ422P, PIX_FMT_NONE},
457 .long_name= NULL_IF_CONFIG_SMALL("MJPEG (Motion JPEG)"),
458 };