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 Libav.
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.
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.
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
36 #include "mpegvideo.h"
40 /* use two quantizer tables (one for luminance and one for chrominance) */
45 av_cold int ff_mjpeg_encode_init(MpegEncContext *s)
49 m = av_malloc(sizeof(MJpegContext));
56 /* build all the huffman tables */
57 ff_mjpeg_build_huffman_codes(m->huff_size_dc_luminance,
58 m->huff_code_dc_luminance,
59 avpriv_mjpeg_bits_dc_luminance,
61 ff_mjpeg_build_huffman_codes(m->huff_size_dc_chrominance,
62 m->huff_code_dc_chrominance,
63 avpriv_mjpeg_bits_dc_chrominance,
65 ff_mjpeg_build_huffman_codes(m->huff_size_ac_luminance,
66 m->huff_code_ac_luminance,
67 avpriv_mjpeg_bits_ac_luminance,
68 avpriv_mjpeg_val_ac_luminance);
69 ff_mjpeg_build_huffman_codes(m->huff_size_ac_chrominance,
70 m->huff_code_ac_chrominance,
71 avpriv_mjpeg_bits_ac_chrominance,
72 avpriv_mjpeg_val_ac_chrominance);
78 void ff_mjpeg_encode_close(MpegEncContext *s)
80 av_free(s->mjpeg_ctx);
83 /* table_class: 0 = DC coef, 1 = AC coefs */
84 static int put_huffman_table(MpegEncContext *s, int table_class, int table_id,
85 const uint8_t *bits_table, const uint8_t *value_table)
87 PutBitContext *p = &s->pb;
90 put_bits(p, 4, table_class);
91 put_bits(p, 4, table_id);
96 put_bits(p, 8, bits_table[i]);
100 put_bits(p, 8, value_table[i]);
105 static void jpeg_table_header(MpegEncContext *s)
107 PutBitContext *p = &s->pb;
114 put_bits(p, 16, 2 + 2 * (1 + 64));
116 put_bits(p, 16, 2 + 1 * (1 + 64));
118 put_bits(p, 4, 0); /* 8 bit precision */
119 put_bits(p, 4, 0); /* table 0 */
121 j = s->intra_scantable.permutated[i];
122 put_bits(p, 8, s->intra_matrix[j]);
125 put_bits(p, 4, 0); /* 8 bit precision */
126 put_bits(p, 4, 1); /* table 1 */
128 j = s->intra_scantable.permutated[i];
129 put_bits(p, 8, s->chroma_intra_matrix[j]);
136 ptr = put_bits_ptr(p);
137 put_bits(p, 16, 0); /* patched later */
139 size += put_huffman_table(s, 0, 0, avpriv_mjpeg_bits_dc_luminance,
140 avpriv_mjpeg_val_dc);
141 size += put_huffman_table(s, 0, 1, avpriv_mjpeg_bits_dc_chrominance,
142 avpriv_mjpeg_val_dc);
144 size += put_huffman_table(s, 1, 0, avpriv_mjpeg_bits_ac_luminance,
145 avpriv_mjpeg_val_ac_luminance);
146 size += put_huffman_table(s, 1, 1, avpriv_mjpeg_bits_ac_chrominance,
147 avpriv_mjpeg_val_ac_chrominance);
151 static void jpeg_put_comments(AVCodecContext *avctx, PutBitContext *p)
156 if (avctx->sample_aspect_ratio.num > 0 && avctx->sample_aspect_ratio.den > 0)
161 avpriv_put_string(p, "JFIF", 1); /* this puts the trailing zero-byte too */
162 put_bits(p, 16, 0x0201); /* v 1.02 */
163 put_bits(p, 8, 0); /* units type: 0 - aspect ratio */
164 put_bits(p, 16, avctx->sample_aspect_ratio.num);
165 put_bits(p, 16, avctx->sample_aspect_ratio.den);
166 put_bits(p, 8, 0); /* thumbnail width */
167 put_bits(p, 8, 0); /* thumbnail height */
171 if (!(avctx->flags & CODEC_FLAG_BITEXACT)) {
174 ptr = put_bits_ptr(p);
175 put_bits(p, 16, 0); /* patched later */
176 avpriv_put_string(p, LIBAVCODEC_IDENT, 1);
177 size = strlen(LIBAVCODEC_IDENT)+3;
181 if( avctx->pix_fmt == AV_PIX_FMT_YUV420P
182 ||avctx->pix_fmt == AV_PIX_FMT_YUV422P
183 ||avctx->pix_fmt == AV_PIX_FMT_YUV444P){
186 ptr = put_bits_ptr(p);
187 put_bits(p, 16, 0); /* patched later */
188 avpriv_put_string(p, "CS=ITU601", 1);
189 size = strlen("CS=ITU601")+3;
194 void ff_mjpeg_encode_picture_header(MpegEncContext *s)
196 const int lossless= s->avctx->codec_id != AV_CODEC_ID_MJPEG;
198 put_marker(&s->pb, SOI);
200 jpeg_put_comments(s->avctx, &s->pb);
202 jpeg_table_header(s);
204 switch(s->avctx->codec_id){
205 case AV_CODEC_ID_MJPEG: put_marker(&s->pb, SOF0 ); break;
206 case AV_CODEC_ID_LJPEG: put_marker(&s->pb, SOF3 ); break;
210 put_bits(&s->pb, 16, 17);
211 if(lossless && s->avctx->pix_fmt == AV_PIX_FMT_BGRA)
212 put_bits(&s->pb, 8, 9); /* 9 bits/component RCT */
214 put_bits(&s->pb, 8, 8); /* 8 bits/component */
215 put_bits(&s->pb, 16, s->height);
216 put_bits(&s->pb, 16, s->width);
217 put_bits(&s->pb, 8, 3); /* 3 components */
220 put_bits(&s->pb, 8, 1); /* component number */
221 put_bits(&s->pb, 4, s->mjpeg_hsample[0]); /* H factor */
222 put_bits(&s->pb, 4, s->mjpeg_vsample[0]); /* V factor */
223 put_bits(&s->pb, 8, 0); /* select matrix */
226 put_bits(&s->pb, 8, 2); /* component number */
227 put_bits(&s->pb, 4, s->mjpeg_hsample[1]); /* H factor */
228 put_bits(&s->pb, 4, s->mjpeg_vsample[1]); /* V factor */
230 put_bits(&s->pb, 8, lossless ? 0 : 1); /* select matrix */
232 put_bits(&s->pb, 8, 0); /* select matrix */
236 put_bits(&s->pb, 8, 3); /* component number */
237 put_bits(&s->pb, 4, s->mjpeg_hsample[2]); /* H factor */
238 put_bits(&s->pb, 4, s->mjpeg_vsample[2]); /* V factor */
240 put_bits(&s->pb, 8, lossless ? 0 : 1); /* select matrix */
242 put_bits(&s->pb, 8, 0); /* select matrix */
246 put_marker(&s->pb, SOS);
247 put_bits(&s->pb, 16, 12); /* length */
248 put_bits(&s->pb, 8, 3); /* 3 components */
251 put_bits(&s->pb, 8, 1); /* index */
252 put_bits(&s->pb, 4, 0); /* DC huffman table index */
253 put_bits(&s->pb, 4, 0); /* AC huffman table index */
256 put_bits(&s->pb, 8, 2); /* index */
257 put_bits(&s->pb, 4, 1); /* DC huffman table index */
258 put_bits(&s->pb, 4, lossless ? 0 : 1); /* AC huffman table index */
261 put_bits(&s->pb, 8, 3); /* index */
262 put_bits(&s->pb, 4, 1); /* DC huffman table index */
263 put_bits(&s->pb, 4, lossless ? 0 : 1); /* AC huffman table index */
265 put_bits(&s->pb, 8, lossless ? s->avctx->prediction_method+1 : 0); /* Ss (not used) */
267 switch(s->avctx->codec_id){
268 case AV_CODEC_ID_MJPEG: put_bits(&s->pb, 8, 63); break; /* Se (not used) */
269 case AV_CODEC_ID_LJPEG: put_bits(&s->pb, 8, 0); break; /* not used */
273 put_bits(&s->pb, 8, 0); /* Ah/Al (not used) */
276 static void escape_FF(MpegEncContext *s, int start)
278 int size= put_bits_count(&s->pb) - start*8;
280 uint8_t *buf= s->pb.buf + start;
281 int align= (-(size_t)(buf))&3;
283 assert((size&7) == 0);
287 for(i=0; i<size && i<align; i++){
288 if(buf[i]==0xFF) ff_count++;
290 for(; i<size-15; i+=16){
293 v= *(uint32_t*)(&buf[i]);
294 acc= (((v & (v>>4))&0x0F0F0F0F)+0x01010101)&0x10101010;
295 v= *(uint32_t*)(&buf[i+4]);
296 acc+=(((v & (v>>4))&0x0F0F0F0F)+0x01010101)&0x10101010;
297 v= *(uint32_t*)(&buf[i+8]);
298 acc+=(((v & (v>>4))&0x0F0F0F0F)+0x01010101)&0x10101010;
299 v= *(uint32_t*)(&buf[i+12]);
300 acc+=(((v & (v>>4))&0x0F0F0F0F)+0x01010101)&0x10101010;
308 if(buf[i]==0xFF) ff_count++;
311 if(ff_count==0) return;
313 flush_put_bits(&s->pb);
314 skip_put_bytes(&s->pb, ff_count);
316 for(i=size-1; ff_count; i--){
328 void ff_mjpeg_encode_stuffing(PutBitContext * pbc)
331 length= (-put_bits_count(pbc))&7;
332 if(length) put_bits(pbc, length, (1<<length)-1);
335 void ff_mjpeg_encode_picture_trailer(MpegEncContext *s)
337 ff_mjpeg_encode_stuffing(&s->pb);
338 flush_put_bits(&s->pb);
340 assert((s->header_bits&7)==0);
342 escape_FF(s, s->header_bits>>3);
344 put_marker(&s->pb, EOI);
347 void ff_mjpeg_encode_dc(MpegEncContext *s, int val,
348 uint8_t *huff_size, uint16_t *huff_code)
353 put_bits(&s->pb, huff_size[0], huff_code[0]);
361 nbits= av_log2_16bit(val) + 1;
363 put_bits(&s->pb, huff_size[nbits], huff_code[nbits]);
365 put_sbits(&s->pb, nbits, mant);
369 static void encode_block(MpegEncContext *s, int16_t *block, int n)
371 int mant, nbits, code, i, j;
372 int component, dc, run, last_index, val;
373 MJpegContext *m = s->mjpeg_ctx;
374 uint8_t *huff_size_ac;
375 uint16_t *huff_code_ac;
378 component = (n <= 3 ? 0 : (n&1) + 1);
379 dc = block[0]; /* overflow is impossible */
380 val = dc - s->last_dc[component];
382 ff_mjpeg_encode_dc(s, val, m->huff_size_dc_luminance, m->huff_code_dc_luminance);
383 huff_size_ac = m->huff_size_ac_luminance;
384 huff_code_ac = m->huff_code_ac_luminance;
386 ff_mjpeg_encode_dc(s, val, m->huff_size_dc_chrominance, m->huff_code_dc_chrominance);
387 huff_size_ac = m->huff_size_ac_chrominance;
388 huff_code_ac = m->huff_code_ac_chrominance;
390 s->last_dc[component] = dc;
395 last_index = s->block_last_index[n];
396 for(i=1;i<=last_index;i++) {
397 j = s->intra_scantable.permutated[i];
403 put_bits(&s->pb, huff_size_ac[0xf0], huff_code_ac[0xf0]);
412 nbits= av_log2(val) + 1;
413 code = (run << 4) | nbits;
415 put_bits(&s->pb, huff_size_ac[code], huff_code_ac[code]);
417 put_sbits(&s->pb, nbits, mant);
422 /* output EOB only if not already 64 values */
423 if (last_index < 63 || run != 0)
424 put_bits(&s->pb, huff_size_ac[0], huff_code_ac[0]);
427 void ff_mjpeg_encode_mb(MpegEncContext *s, int16_t block[6][64])
431 encode_block(s, block[i], i);
433 if (s->chroma_format == CHROMA_420) {
434 encode_block(s, block[5], 5);
436 encode_block(s, block[6], 6);
437 encode_block(s, block[5], 5);
438 encode_block(s, block[7], 7);
441 s->i_tex_bits += get_bits_diff(s);
444 AVCodec ff_mjpeg_encoder = {
446 .long_name = NULL_IF_CONFIG_SMALL("MJPEG (Motion JPEG)"),
447 .type = AVMEDIA_TYPE_VIDEO,
448 .id = AV_CODEC_ID_MJPEG,
449 .priv_data_size = sizeof(MpegEncContext),
450 .init = ff_MPV_encode_init,
451 .encode2 = ff_MPV_encode_picture,
452 .close = ff_MPV_encode_end,
453 .pix_fmts = (const enum AVPixelFormat[]){
454 AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_NONE