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
37 #include "mpegvideo.h"
41 /* use two quantizer tables (one for luminance and one for chrominance) */
46 av_cold int ff_mjpeg_encode_init(MpegEncContext *s)
50 m = av_malloc(sizeof(MJpegContext));
57 /* build all the huffman tables */
58 ff_mjpeg_build_huffman_codes(m->huff_size_dc_luminance,
59 m->huff_code_dc_luminance,
60 avpriv_mjpeg_bits_dc_luminance,
62 ff_mjpeg_build_huffman_codes(m->huff_size_dc_chrominance,
63 m->huff_code_dc_chrominance,
64 avpriv_mjpeg_bits_dc_chrominance,
66 ff_mjpeg_build_huffman_codes(m->huff_size_ac_luminance,
67 m->huff_code_ac_luminance,
68 avpriv_mjpeg_bits_ac_luminance,
69 avpriv_mjpeg_val_ac_luminance);
70 ff_mjpeg_build_huffman_codes(m->huff_size_ac_chrominance,
71 m->huff_code_ac_chrominance,
72 avpriv_mjpeg_bits_ac_chrominance,
73 avpriv_mjpeg_val_ac_chrominance);
79 void ff_mjpeg_encode_close(MpegEncContext *s)
81 av_free(s->mjpeg_ctx);
84 /* table_class: 0 = DC coef, 1 = AC coefs */
85 static int put_huffman_table(MpegEncContext *s, int table_class, int table_id,
86 const uint8_t *bits_table, const uint8_t *value_table)
88 PutBitContext *p = &s->pb;
91 put_bits(p, 4, table_class);
92 put_bits(p, 4, table_id);
97 put_bits(p, 8, bits_table[i]);
101 put_bits(p, 8, value_table[i]);
106 static void jpeg_table_header(MpegEncContext *s)
108 PutBitContext *p = &s->pb;
115 put_bits(p, 16, 2 + 2 * (1 + 64));
117 put_bits(p, 16, 2 + 1 * (1 + 64));
119 put_bits(p, 4, 0); /* 8 bit precision */
120 put_bits(p, 4, 0); /* table 0 */
122 j = s->intra_scantable.permutated[i];
123 put_bits(p, 8, s->intra_matrix[j]);
126 put_bits(p, 4, 0); /* 8 bit precision */
127 put_bits(p, 4, 1); /* table 1 */
129 j = s->intra_scantable.permutated[i];
130 put_bits(p, 8, s->chroma_intra_matrix[j]);
137 ptr = put_bits_ptr(p);
138 put_bits(p, 16, 0); /* patched later */
140 size += put_huffman_table(s, 0, 0, avpriv_mjpeg_bits_dc_luminance,
141 avpriv_mjpeg_val_dc);
142 size += put_huffman_table(s, 0, 1, avpriv_mjpeg_bits_dc_chrominance,
143 avpriv_mjpeg_val_dc);
145 size += put_huffman_table(s, 1, 0, avpriv_mjpeg_bits_ac_luminance,
146 avpriv_mjpeg_val_ac_luminance);
147 size += put_huffman_table(s, 1, 1, avpriv_mjpeg_bits_ac_chrominance,
148 avpriv_mjpeg_val_ac_chrominance);
152 static void jpeg_put_comments(MpegEncContext *s)
154 PutBitContext *p = &s->pb;
158 if (s->aspect_ratio_info /* && !lossless */)
163 avpriv_put_string(p, "JFIF", 1); /* this puts the trailing zero-byte too */
164 put_bits(p, 16, 0x0201); /* v 1.02 */
165 put_bits(p, 8, 0); /* units type: 0 - aspect ratio */
166 put_bits(p, 16, s->avctx->sample_aspect_ratio.num);
167 put_bits(p, 16, s->avctx->sample_aspect_ratio.den);
168 put_bits(p, 8, 0); /* thumbnail width */
169 put_bits(p, 8, 0); /* thumbnail height */
173 if(!(s->flags & CODEC_FLAG_BITEXACT)){
176 ptr = put_bits_ptr(p);
177 put_bits(p, 16, 0); /* patched later */
178 avpriv_put_string(p, LIBAVCODEC_IDENT, 1);
179 size = strlen(LIBAVCODEC_IDENT)+3;
183 if( s->avctx->pix_fmt == AV_PIX_FMT_YUV420P
184 ||s->avctx->pix_fmt == AV_PIX_FMT_YUV422P
185 ||s->avctx->pix_fmt == AV_PIX_FMT_YUV444P){
188 ptr = put_bits_ptr(p);
189 put_bits(p, 16, 0); /* patched later */
190 avpriv_put_string(p, "CS=ITU601", 1);
191 size = strlen("CS=ITU601")+3;
196 void ff_mjpeg_encode_picture_header(MpegEncContext *s)
198 const int lossless= s->avctx->codec_id != AV_CODEC_ID_MJPEG;
200 put_marker(&s->pb, SOI);
202 jpeg_put_comments(s);
204 jpeg_table_header(s);
206 switch(s->avctx->codec_id){
207 case AV_CODEC_ID_MJPEG: put_marker(&s->pb, SOF0 ); break;
208 case AV_CODEC_ID_LJPEG: put_marker(&s->pb, SOF3 ); break;
212 put_bits(&s->pb, 16, 17);
213 if(lossless && s->avctx->pix_fmt == AV_PIX_FMT_BGRA)
214 put_bits(&s->pb, 8, 9); /* 9 bits/component RCT */
216 put_bits(&s->pb, 8, 8); /* 8 bits/component */
217 put_bits(&s->pb, 16, s->height);
218 put_bits(&s->pb, 16, s->width);
219 put_bits(&s->pb, 8, 3); /* 3 components */
222 put_bits(&s->pb, 8, 1); /* component number */
223 put_bits(&s->pb, 4, s->mjpeg_hsample[0]); /* H factor */
224 put_bits(&s->pb, 4, s->mjpeg_vsample[0]); /* V factor */
225 put_bits(&s->pb, 8, 0); /* select matrix */
228 put_bits(&s->pb, 8, 2); /* component number */
229 put_bits(&s->pb, 4, s->mjpeg_hsample[1]); /* H factor */
230 put_bits(&s->pb, 4, s->mjpeg_vsample[1]); /* V factor */
232 put_bits(&s->pb, 8, lossless ? 0 : 1); /* select matrix */
234 put_bits(&s->pb, 8, 0); /* select matrix */
238 put_bits(&s->pb, 8, 3); /* component number */
239 put_bits(&s->pb, 4, s->mjpeg_hsample[2]); /* H factor */
240 put_bits(&s->pb, 4, s->mjpeg_vsample[2]); /* V factor */
242 put_bits(&s->pb, 8, lossless ? 0 : 1); /* select matrix */
244 put_bits(&s->pb, 8, 0); /* select matrix */
248 put_marker(&s->pb, SOS);
249 put_bits(&s->pb, 16, 12); /* length */
250 put_bits(&s->pb, 8, 3); /* 3 components */
253 put_bits(&s->pb, 8, 1); /* index */
254 put_bits(&s->pb, 4, 0); /* DC huffman table index */
255 put_bits(&s->pb, 4, 0); /* AC huffman table index */
258 put_bits(&s->pb, 8, 2); /* index */
259 put_bits(&s->pb, 4, 1); /* DC huffman table index */
260 put_bits(&s->pb, 4, lossless ? 0 : 1); /* AC huffman table index */
263 put_bits(&s->pb, 8, 3); /* index */
264 put_bits(&s->pb, 4, 1); /* DC huffman table index */
265 put_bits(&s->pb, 4, lossless ? 0 : 1); /* AC huffman table index */
267 put_bits(&s->pb, 8, lossless ? s->avctx->prediction_method+1 : 0); /* Ss (not used) */
269 switch(s->avctx->codec_id){
270 case AV_CODEC_ID_MJPEG: put_bits(&s->pb, 8, 63); break; /* Se (not used) */
271 case AV_CODEC_ID_LJPEG: put_bits(&s->pb, 8, 0); break; /* not used */
275 put_bits(&s->pb, 8, 0); /* Ah/Al (not used) */
278 static void escape_FF(MpegEncContext *s, int start)
280 int size= put_bits_count(&s->pb) - start*8;
282 uint8_t *buf= s->pb.buf + start;
283 int align= (-(size_t)(buf))&3;
285 assert((size&7) == 0);
289 for(i=0; i<size && i<align; i++){
290 if(buf[i]==0xFF) ff_count++;
292 for(; i<size-15; i+=16){
295 v= *(uint32_t*)(&buf[i]);
296 acc= (((v & (v>>4))&0x0F0F0F0F)+0x01010101)&0x10101010;
297 v= *(uint32_t*)(&buf[i+4]);
298 acc+=(((v & (v>>4))&0x0F0F0F0F)+0x01010101)&0x10101010;
299 v= *(uint32_t*)(&buf[i+8]);
300 acc+=(((v & (v>>4))&0x0F0F0F0F)+0x01010101)&0x10101010;
301 v= *(uint32_t*)(&buf[i+12]);
302 acc+=(((v & (v>>4))&0x0F0F0F0F)+0x01010101)&0x10101010;
310 if(buf[i]==0xFF) ff_count++;
313 if(ff_count==0) return;
315 flush_put_bits(&s->pb);
316 skip_put_bytes(&s->pb, ff_count);
318 for(i=size-1; ff_count; i--){
330 void ff_mjpeg_encode_stuffing(PutBitContext * pbc)
333 length= (-put_bits_count(pbc))&7;
334 if(length) put_bits(pbc, length, (1<<length)-1);
337 void ff_mjpeg_encode_picture_trailer(MpegEncContext *s)
339 ff_mjpeg_encode_stuffing(&s->pb);
340 flush_put_bits(&s->pb);
342 assert((s->header_bits&7)==0);
344 escape_FF(s, s->header_bits>>3);
346 put_marker(&s->pb, EOI);
349 void ff_mjpeg_encode_dc(MpegEncContext *s, int val,
350 uint8_t *huff_size, uint16_t *huff_code)
355 put_bits(&s->pb, huff_size[0], huff_code[0]);
363 nbits= av_log2_16bit(val) + 1;
365 put_bits(&s->pb, huff_size[nbits], huff_code[nbits]);
367 put_sbits(&s->pb, nbits, mant);
371 static void encode_block(MpegEncContext *s, int16_t *block, int n)
373 int mant, nbits, code, i, j;
374 int component, dc, run, last_index, val;
375 MJpegContext *m = s->mjpeg_ctx;
376 uint8_t *huff_size_ac;
377 uint16_t *huff_code_ac;
380 component = (n <= 3 ? 0 : (n&1) + 1);
381 dc = block[0]; /* overflow is impossible */
382 val = dc - s->last_dc[component];
384 ff_mjpeg_encode_dc(s, val, m->huff_size_dc_luminance, m->huff_code_dc_luminance);
385 huff_size_ac = m->huff_size_ac_luminance;
386 huff_code_ac = m->huff_code_ac_luminance;
388 ff_mjpeg_encode_dc(s, val, m->huff_size_dc_chrominance, m->huff_code_dc_chrominance);
389 huff_size_ac = m->huff_size_ac_chrominance;
390 huff_code_ac = m->huff_code_ac_chrominance;
392 s->last_dc[component] = dc;
397 last_index = s->block_last_index[n];
398 for(i=1;i<=last_index;i++) {
399 j = s->intra_scantable.permutated[i];
405 put_bits(&s->pb, huff_size_ac[0xf0], huff_code_ac[0xf0]);
414 nbits= av_log2(val) + 1;
415 code = (run << 4) | nbits;
417 put_bits(&s->pb, huff_size_ac[code], huff_code_ac[code]);
419 put_sbits(&s->pb, nbits, mant);
424 /* output EOB only if not already 64 values */
425 if (last_index < 63 || run != 0)
426 put_bits(&s->pb, huff_size_ac[0], huff_code_ac[0]);
429 void ff_mjpeg_encode_mb(MpegEncContext *s, int16_t block[6][64])
433 encode_block(s, block[i], i);
435 if (s->chroma_format == CHROMA_420) {
436 encode_block(s, block[5], 5);
438 encode_block(s, block[6], 6);
439 encode_block(s, block[5], 5);
440 encode_block(s, block[7], 7);
443 s->i_tex_bits += get_bits_diff(s);
446 AVCodec ff_mjpeg_encoder = {
448 .type = AVMEDIA_TYPE_VIDEO,
449 .id = AV_CODEC_ID_MJPEG,
450 .priv_data_size = sizeof(MpegEncContext),
451 .init = ff_MPV_encode_init,
452 .encode2 = ff_MPV_encode_picture,
453 .close = ff_MPV_encode_end,
454 .pix_fmts = (const enum AVPixelFormat[]){
455 AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_NONE
457 .long_name = NULL_IF_CONFIG_SMALL("MJPEG (Motion JPEG)"),