mjpegenc: do not pass MpegEncContext to ff_mjpeg_encode_dc()
[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 Libav.
12 *
13 * Libav 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 * Libav 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 Libav; 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 #include <assert.h>
34
35 #include "libavutil/pixdesc.h"
36
37 #include "avcodec.h"
38 #include "mpegvideo.h"
39 #include "mjpeg.h"
40 #include "mjpegenc.h"
41
42 av_cold int ff_mjpeg_encode_init(MpegEncContext *s)
43 {
44 MJpegContext *m;
45
46 m = av_malloc(sizeof(MJpegContext));
47 if (!m)
48 return -1;
49
50 s->min_qcoeff=-1023;
51 s->max_qcoeff= 1023;
52
53 /* build all the huffman tables */
54 ff_mjpeg_build_huffman_codes(m->huff_size_dc_luminance,
55 m->huff_code_dc_luminance,
56 avpriv_mjpeg_bits_dc_luminance,
57 avpriv_mjpeg_val_dc);
58 ff_mjpeg_build_huffman_codes(m->huff_size_dc_chrominance,
59 m->huff_code_dc_chrominance,
60 avpriv_mjpeg_bits_dc_chrominance,
61 avpriv_mjpeg_val_dc);
62 ff_mjpeg_build_huffman_codes(m->huff_size_ac_luminance,
63 m->huff_code_ac_luminance,
64 avpriv_mjpeg_bits_ac_luminance,
65 avpriv_mjpeg_val_ac_luminance);
66 ff_mjpeg_build_huffman_codes(m->huff_size_ac_chrominance,
67 m->huff_code_ac_chrominance,
68 avpriv_mjpeg_bits_ac_chrominance,
69 avpriv_mjpeg_val_ac_chrominance);
70
71 s->mjpeg_ctx = m;
72 return 0;
73 }
74
75 void ff_mjpeg_encode_close(MpegEncContext *s)
76 {
77 av_free(s->mjpeg_ctx);
78 }
79
80 /* table_class: 0 = DC coef, 1 = AC coefs */
81 static int put_huffman_table(PutBitContext *p, int table_class, int table_id,
82 const uint8_t *bits_table, const uint8_t *value_table)
83 {
84 int n, i;
85
86 put_bits(p, 4, table_class);
87 put_bits(p, 4, table_id);
88
89 n = 0;
90 for(i=1;i<=16;i++) {
91 n += bits_table[i];
92 put_bits(p, 8, bits_table[i]);
93 }
94
95 for(i=0;i<n;i++)
96 put_bits(p, 8, value_table[i]);
97
98 return n + 17;
99 }
100
101 static void jpeg_table_header(PutBitContext *p, ScanTable *intra_scantable,
102 uint16_t intra_matrix[64])
103 {
104 int i, j, size;
105 uint8_t *ptr;
106
107 /* quant matrixes */
108 put_marker(p, DQT);
109 put_bits(p, 16, 2 + 1 * (1 + 64));
110 put_bits(p, 4, 0); /* 8 bit precision */
111 put_bits(p, 4, 0); /* table 0 */
112 for(i=0;i<64;i++) {
113 j = intra_scantable->permutated[i];
114 put_bits(p, 8, intra_matrix[j]);
115 }
116
117 /* huffman table */
118 put_marker(p, DHT);
119 flush_put_bits(p);
120 ptr = put_bits_ptr(p);
121 put_bits(p, 16, 0); /* patched later */
122 size = 2;
123 size += put_huffman_table(p, 0, 0, avpriv_mjpeg_bits_dc_luminance,
124 avpriv_mjpeg_val_dc);
125 size += put_huffman_table(p, 0, 1, avpriv_mjpeg_bits_dc_chrominance,
126 avpriv_mjpeg_val_dc);
127
128 size += put_huffman_table(p, 1, 0, avpriv_mjpeg_bits_ac_luminance,
129 avpriv_mjpeg_val_ac_luminance);
130 size += put_huffman_table(p, 1, 1, avpriv_mjpeg_bits_ac_chrominance,
131 avpriv_mjpeg_val_ac_chrominance);
132 AV_WB16(ptr, size);
133 }
134
135 static void jpeg_put_comments(AVCodecContext *avctx, PutBitContext *p)
136 {
137 int size;
138 uint8_t *ptr;
139
140 if (avctx->sample_aspect_ratio.num > 0 && avctx->sample_aspect_ratio.den > 0) {
141 /* JFIF header */
142 put_marker(p, APP0);
143 put_bits(p, 16, 16);
144 avpriv_put_string(p, "JFIF", 1); /* this puts the trailing zero-byte too */
145 put_bits(p, 16, 0x0201); /* v 1.02 */
146 put_bits(p, 8, 0); /* units type: 0 - aspect ratio */
147 put_bits(p, 16, avctx->sample_aspect_ratio.num);
148 put_bits(p, 16, avctx->sample_aspect_ratio.den);
149 put_bits(p, 8, 0); /* thumbnail width */
150 put_bits(p, 8, 0); /* thumbnail height */
151 }
152
153 /* comment */
154 if (!(avctx->flags & CODEC_FLAG_BITEXACT)) {
155 put_marker(p, COM);
156 flush_put_bits(p);
157 ptr = put_bits_ptr(p);
158 put_bits(p, 16, 0); /* patched later */
159 avpriv_put_string(p, LIBAVCODEC_IDENT, 1);
160 size = strlen(LIBAVCODEC_IDENT)+3;
161 AV_WB16(ptr, size);
162 }
163
164 if (avctx->pix_fmt == AV_PIX_FMT_YUV420P ||
165 avctx->pix_fmt == AV_PIX_FMT_YUV422P ||
166 avctx->pix_fmt == AV_PIX_FMT_YUV444P) {
167 put_marker(p, COM);
168 flush_put_bits(p);
169 ptr = put_bits_ptr(p);
170 put_bits(p, 16, 0); /* patched later */
171 avpriv_put_string(p, "CS=ITU601", 1);
172 size = strlen("CS=ITU601")+3;
173 AV_WB16(ptr, size);
174 }
175 }
176
177 void ff_mjpeg_encode_picture_header(AVCodecContext *avctx, PutBitContext *pb,
178 ScanTable *intra_scantable,
179 uint16_t intra_matrix[64])
180 {
181 int chroma_h_shift, chroma_v_shift;
182 const int lossless = avctx->codec_id != AV_CODEC_ID_MJPEG;
183 int hsample[3], vsample[3];
184
185 av_pix_fmt_get_chroma_sub_sample(avctx->pix_fmt, &chroma_h_shift,
186 &chroma_v_shift);
187
188 if (avctx->codec->id == AV_CODEC_ID_LJPEG &&
189 avctx->pix_fmt == AV_PIX_FMT_BGRA) {
190 vsample[0] = hsample[0] =
191 vsample[1] = hsample[1] =
192 vsample[2] = hsample[2] = 1;
193 } else {
194 vsample[0] = 2;
195 vsample[1] = 2 >> chroma_v_shift;
196 vsample[2] = 2 >> chroma_v_shift;
197 hsample[0] = 2;
198 hsample[1] = 2 >> chroma_h_shift;
199 hsample[2] = 2 >> chroma_h_shift;
200 }
201
202 put_marker(pb, SOI);
203
204 jpeg_put_comments(avctx, pb);
205
206 jpeg_table_header(pb, intra_scantable, intra_matrix);
207
208 switch (avctx->codec_id) {
209 case AV_CODEC_ID_MJPEG: put_marker(pb, SOF0 ); break;
210 case AV_CODEC_ID_LJPEG: put_marker(pb, SOF3 ); break;
211 default: assert(0);
212 }
213
214 put_bits(pb, 16, 17);
215 if (lossless && avctx->pix_fmt == AV_PIX_FMT_BGRA)
216 put_bits(pb, 8, 9); /* 9 bits/component RCT */
217 else
218 put_bits(pb, 8, 8); /* 8 bits/component */
219 put_bits(pb, 16, avctx->height);
220 put_bits(pb, 16, avctx->width);
221 put_bits(pb, 8, 3); /* 3 components */
222
223 /* Y component */
224 put_bits(pb, 8, 1); /* component number */
225 put_bits(pb, 4, hsample[0]); /* H factor */
226 put_bits(pb, 4, vsample[0]); /* V factor */
227 put_bits(pb, 8, 0); /* select matrix */
228
229 /* Cb component */
230 put_bits(pb, 8, 2); /* component number */
231 put_bits(pb, 4, hsample[1]); /* H factor */
232 put_bits(pb, 4, vsample[1]); /* V factor */
233 put_bits(pb, 8, 0); /* select matrix */
234
235 /* Cr component */
236 put_bits(pb, 8, 3); /* component number */
237 put_bits(pb, 4, hsample[2]); /* H factor */
238 put_bits(pb, 4, vsample[2]); /* V factor */
239 put_bits(pb, 8, 0); /* select matrix */
240
241 /* scan header */
242 put_marker(pb, SOS);
243 put_bits(pb, 16, 12); /* length */
244 put_bits(pb, 8, 3); /* 3 components */
245
246 /* Y component */
247 put_bits(pb, 8, 1); /* index */
248 put_bits(pb, 4, 0); /* DC huffman table index */
249 put_bits(pb, 4, 0); /* AC huffman table index */
250
251 /* Cb component */
252 put_bits(pb, 8, 2); /* index */
253 put_bits(pb, 4, 1); /* DC huffman table index */
254 put_bits(pb, 4, lossless ? 0 : 1); /* AC huffman table index */
255
256 /* Cr component */
257 put_bits(pb, 8, 3); /* index */
258 put_bits(pb, 4, 1); /* DC huffman table index */
259 put_bits(pb, 4, lossless ? 0 : 1); /* AC huffman table index */
260
261 put_bits(pb, 8, lossless ? avctx->prediction_method + 1 : 0); /* Ss (not used) */
262
263 switch (avctx->codec_id) {
264 case AV_CODEC_ID_MJPEG: put_bits(pb, 8, 63); break; /* Se (not used) */
265 case AV_CODEC_ID_LJPEG: put_bits(pb, 8, 0); break; /* not used */
266 default: assert(0);
267 }
268
269 put_bits(pb, 8, 0); /* Ah/Al (not used) */
270 }
271
272 static void escape_FF(PutBitContext *pb, int start)
273 {
274 int size = put_bits_count(pb) - start * 8;
275 int i, ff_count;
276 uint8_t *buf = pb->buf + start;
277 int align= (-(size_t)(buf))&3;
278
279 assert((size&7) == 0);
280 size >>= 3;
281
282 ff_count=0;
283 for(i=0; i<size && i<align; i++){
284 if(buf[i]==0xFF) ff_count++;
285 }
286 for(; i<size-15; i+=16){
287 int acc, v;
288
289 v= *(uint32_t*)(&buf[i]);
290 acc= (((v & (v>>4))&0x0F0F0F0F)+0x01010101)&0x10101010;
291 v= *(uint32_t*)(&buf[i+4]);
292 acc+=(((v & (v>>4))&0x0F0F0F0F)+0x01010101)&0x10101010;
293 v= *(uint32_t*)(&buf[i+8]);
294 acc+=(((v & (v>>4))&0x0F0F0F0F)+0x01010101)&0x10101010;
295 v= *(uint32_t*)(&buf[i+12]);
296 acc+=(((v & (v>>4))&0x0F0F0F0F)+0x01010101)&0x10101010;
297
298 acc>>=4;
299 acc+= (acc>>16);
300 acc+= (acc>>8);
301 ff_count+= acc&0xFF;
302 }
303 for(; i<size; i++){
304 if(buf[i]==0xFF) ff_count++;
305 }
306
307 if(ff_count==0) return;
308
309 flush_put_bits(pb);
310 skip_put_bytes(pb, ff_count);
311
312 for(i=size-1; ff_count; i--){
313 int v= buf[i];
314
315 if(v==0xFF){
316 buf[i+ff_count]= 0;
317 ff_count--;
318 }
319
320 buf[i+ff_count]= v;
321 }
322 }
323
324 void ff_mjpeg_encode_stuffing(PutBitContext * pbc)
325 {
326 int length;
327 length= (-put_bits_count(pbc))&7;
328 if(length) put_bits(pbc, length, (1<<length)-1);
329 }
330
331 void ff_mjpeg_encode_picture_trailer(PutBitContext *pb, int header_bits)
332 {
333 ff_mjpeg_encode_stuffing(pb);
334 flush_put_bits(pb);
335
336 assert((header_bits & 7) == 0);
337
338 escape_FF(pb, header_bits >> 3);
339
340 put_marker(pb, EOI);
341 }
342
343 void ff_mjpeg_encode_dc(PutBitContext *pb, int val,
344 uint8_t *huff_size, uint16_t *huff_code)
345 {
346 int mant, nbits;
347
348 if (val == 0) {
349 put_bits(pb, huff_size[0], huff_code[0]);
350 } else {
351 mant = val;
352 if (val < 0) {
353 val = -val;
354 mant--;
355 }
356
357 nbits= av_log2_16bit(val) + 1;
358
359 put_bits(pb, huff_size[nbits], huff_code[nbits]);
360
361 put_sbits(pb, nbits, mant);
362 }
363 }
364
365 static void encode_block(MpegEncContext *s, int16_t *block, int n)
366 {
367 int mant, nbits, code, i, j;
368 int component, dc, run, last_index, val;
369 MJpegContext *m = s->mjpeg_ctx;
370 uint8_t *huff_size_ac;
371 uint16_t *huff_code_ac;
372
373 /* DC coef */
374 component = (n <= 3 ? 0 : (n&1) + 1);
375 dc = block[0]; /* overflow is impossible */
376 val = dc - s->last_dc[component];
377 if (n < 4) {
378 ff_mjpeg_encode_dc(&s->pb, val, m->huff_size_dc_luminance, m->huff_code_dc_luminance);
379 huff_size_ac = m->huff_size_ac_luminance;
380 huff_code_ac = m->huff_code_ac_luminance;
381 } else {
382 ff_mjpeg_encode_dc(&s->pb, val, m->huff_size_dc_chrominance, m->huff_code_dc_chrominance);
383 huff_size_ac = m->huff_size_ac_chrominance;
384 huff_code_ac = m->huff_code_ac_chrominance;
385 }
386 s->last_dc[component] = dc;
387
388 /* AC coefs */
389
390 run = 0;
391 last_index = s->block_last_index[n];
392 for(i=1;i<=last_index;i++) {
393 j = s->intra_scantable.permutated[i];
394 val = block[j];
395 if (val == 0) {
396 run++;
397 } else {
398 while (run >= 16) {
399 put_bits(&s->pb, huff_size_ac[0xf0], huff_code_ac[0xf0]);
400 run -= 16;
401 }
402 mant = val;
403 if (val < 0) {
404 val = -val;
405 mant--;
406 }
407
408 nbits= av_log2(val) + 1;
409 code = (run << 4) | nbits;
410
411 put_bits(&s->pb, huff_size_ac[code], huff_code_ac[code]);
412
413 put_sbits(&s->pb, nbits, mant);
414 run = 0;
415 }
416 }
417
418 /* output EOB only if not already 64 values */
419 if (last_index < 63 || run != 0)
420 put_bits(&s->pb, huff_size_ac[0], huff_code_ac[0]);
421 }
422
423 void ff_mjpeg_encode_mb(MpegEncContext *s, int16_t block[6][64])
424 {
425 int i;
426 for(i=0;i<5;i++) {
427 encode_block(s, block[i], i);
428 }
429 if (s->chroma_format == CHROMA_420) {
430 encode_block(s, block[5], 5);
431 } else {
432 encode_block(s, block[6], 6);
433 encode_block(s, block[5], 5);
434 encode_block(s, block[7], 7);
435 }
436
437 s->i_tex_bits += get_bits_diff(s);
438 }
439
440 AVCodec ff_mjpeg_encoder = {
441 .name = "mjpeg",
442 .long_name = NULL_IF_CONFIG_SMALL("MJPEG (Motion JPEG)"),
443 .type = AVMEDIA_TYPE_VIDEO,
444 .id = AV_CODEC_ID_MJPEG,
445 .priv_data_size = sizeof(MpegEncContext),
446 .init = ff_MPV_encode_init,
447 .encode2 = ff_MPV_encode_picture,
448 .close = ff_MPV_encode_end,
449 .pix_fmts = (const enum AVPixelFormat[]){
450 AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_NONE
451 },
452 };