3 * Copyright (c) 2000, 2001 Fabrice Bellard
4 * Copyright (c) 2003 Alex Beregszaszi
5 * Copyright (c) 2003-2004 Michael Niedermayer
7 * Support for external huffman table, various fixes (AVID workaround),
8 * aspecting, new decode_frame mechanism and apple mjpeg-b support
11 * This file is part of FFmpeg.
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.
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.
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
38 #include "mpegvideo.h"
42 /* use two quantizer tables (one for luminance and one for chrominance) */
47 av_cold int ff_mjpeg_encode_init(MpegEncContext *s)
51 m = av_malloc(sizeof(MJpegContext));
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,
63 ff_mjpeg_build_huffman_codes(m->huff_size_dc_chrominance,
64 m->huff_code_dc_chrominance,
65 ff_mjpeg_bits_dc_chrominance,
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);
80 void ff_mjpeg_encode_close(MpegEncContext *s)
82 av_free(s->mjpeg_ctx);
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)
89 PutBitContext *p = &s->pb;
92 put_bits(p, 4, table_class);
93 put_bits(p, 4, table_id);
98 put_bits(p, 8, bits_table[i]);
102 put_bits(p, 8, value_table[i]);
107 static void jpeg_table_header(MpegEncContext *s)
109 PutBitContext *p = &s->pb;
116 put_bits(p, 16, 2 + 2 * (1 + 64));
118 put_bits(p, 16, 2 + 1 * (1 + 64));
120 put_bits(p, 4, 0); /* 8 bit precision */
121 put_bits(p, 4, 0); /* table 0 */
123 j = s->intra_scantable.permutated[i];
124 put_bits(p, 8, s->intra_matrix[j]);
127 put_bits(p, 4, 0); /* 8 bit precision */
128 put_bits(p, 4, 1); /* table 1 */
130 j = s->intra_scantable.permutated[i];
131 put_bits(p, 8, s->chroma_intra_matrix[j]);
138 ptr = put_bits_ptr(p);
139 put_bits(p, 16, 0); /* patched later */
141 size += put_huffman_table(s, 0, 0, ff_mjpeg_bits_dc_luminance,
143 size += put_huffman_table(s, 0, 1, ff_mjpeg_bits_dc_chrominance,
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);
153 static void jpeg_put_comments(MpegEncContext *s)
155 PutBitContext *p = &s->pb;
159 if (s->aspect_ratio_info /* && !lossless */)
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 */
174 if(!(s->flags & CODEC_FLAG_BITEXACT)){
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;
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){
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;
197 void ff_mjpeg_encode_picture_header(MpegEncContext *s)
199 const int lossless= s->avctx->codec_id != CODEC_ID_MJPEG;
201 put_marker(&s->pb, SOI);
203 jpeg_put_comments(s);
205 jpeg_table_header(s);
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;
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 */
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 */
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 */
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 */
233 put_bits(&s->pb, 8, lossless ? 0 : 1); /* select matrix */
235 put_bits(&s->pb, 8, 0); /* select matrix */
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 */
243 put_bits(&s->pb, 8, lossless ? 0 : 1); /* select matrix */
245 put_bits(&s->pb, 8, 0); /* select matrix */
249 put_marker(&s->pb, SOS);
250 put_bits(&s->pb, 16, 12); /* length */
251 put_bits(&s->pb, 8, 3); /* 3 components */
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 */
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 */
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 */
268 put_bits(&s->pb, 8, lossless ? s->avctx->prediction_method+1 : 0); /* Ss (not used) */
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 */
276 put_bits(&s->pb, 8, 0); /* Ah/Al (not used) */
279 static void escape_FF(MpegEncContext *s, int start)
281 int size= put_bits_count(&s->pb) - start*8;
283 uint8_t *buf= s->pb.buf + start;
284 int align= (-(size_t)(buf))&3;
286 assert((size&7) == 0);
290 for(i=0; i<size && i<align; i++){
291 if(buf[i]==0xFF) ff_count++;
293 for(; i<size-15; i+=16){
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;
311 if(buf[i]==0xFF) ff_count++;
314 if(ff_count==0) return;
316 flush_put_bits(&s->pb);
317 skip_put_bytes(&s->pb, ff_count);
319 for(i=size-1; ff_count; i--){
323 //printf("%d %d\n", i, ff_count);
332 void ff_mjpeg_encode_stuffing(PutBitContext * pbc)
335 length= (-put_bits_count(pbc))&7;
336 if(length) put_bits(pbc, length, (1<<length)-1);
339 void ff_mjpeg_encode_picture_trailer(MpegEncContext *s)
341 ff_mjpeg_encode_stuffing(&s->pb);
342 flush_put_bits(&s->pb);
344 assert((s->header_bits&7)==0);
346 escape_FF(s, s->header_bits>>3);
348 put_marker(&s->pb, EOI);
351 void ff_mjpeg_encode_dc(MpegEncContext *s, int val,
352 uint8_t *huff_size, uint16_t *huff_code)
357 put_bits(&s->pb, huff_size[0], huff_code[0]);
365 nbits= av_log2_16bit(val) + 1;
367 put_bits(&s->pb, huff_size[nbits], huff_code[nbits]);
369 put_sbits(&s->pb, nbits, mant);
373 static void encode_block(MpegEncContext *s, DCTELEM *block, int n)
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;
382 component = (n <= 3 ? 0 : (n&1) + 1);
383 dc = block[0]; /* overflow is impossible */
384 val = dc - s->last_dc[component];
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;
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;
394 s->last_dc[component] = dc;
399 last_index = s->block_last_index[n];
400 for(i=1;i<=last_index;i++) {
401 j = s->intra_scantable.permutated[i];
407 put_bits(&s->pb, huff_size_ac[0xf0], huff_code_ac[0xf0]);
416 nbits= av_log2(val) + 1;
417 code = (run << 4) | nbits;
419 put_bits(&s->pb, huff_size_ac[code], huff_code_ac[code]);
421 put_sbits(&s->pb, nbits, mant);
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]);
431 void ff_mjpeg_encode_mb(MpegEncContext *s, DCTELEM block[6][64])
435 encode_block(s, block[i], i);
437 if (s->chroma_format == CHROMA_420) {
438 encode_block(s, block[5], 5);
440 encode_block(s, block[6], 6);
441 encode_block(s, block[5], 5);
442 encode_block(s, block[7], 7);
445 s->i_tex_bits += get_bits_diff(s);
448 AVCodec ff_mjpeg_encoder = {
452 sizeof(MpegEncContext),
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)"),