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 av_cold int ff_mjpeg_encode_init(MpegEncContext *s)
44 m = av_malloc(sizeof(MJpegContext));
51 /* build all the huffman tables */
52 ff_mjpeg_build_huffman_codes(m->huff_size_dc_luminance,
53 m->huff_code_dc_luminance,
54 avpriv_mjpeg_bits_dc_luminance,
56 ff_mjpeg_build_huffman_codes(m->huff_size_dc_chrominance,
57 m->huff_code_dc_chrominance,
58 avpriv_mjpeg_bits_dc_chrominance,
60 ff_mjpeg_build_huffman_codes(m->huff_size_ac_luminance,
61 m->huff_code_ac_luminance,
62 avpriv_mjpeg_bits_ac_luminance,
63 avpriv_mjpeg_val_ac_luminance);
64 ff_mjpeg_build_huffman_codes(m->huff_size_ac_chrominance,
65 m->huff_code_ac_chrominance,
66 avpriv_mjpeg_bits_ac_chrominance,
67 avpriv_mjpeg_val_ac_chrominance);
73 void ff_mjpeg_encode_close(MpegEncContext *s)
75 av_free(s->mjpeg_ctx);
78 /* table_class: 0 = DC coef, 1 = AC coefs */
79 static int put_huffman_table(PutBitContext *p, int table_class, int table_id,
80 const uint8_t *bits_table, const uint8_t *value_table)
84 put_bits(p, 4, table_class);
85 put_bits(p, 4, table_id);
90 put_bits(p, 8, bits_table[i]);
94 put_bits(p, 8, value_table[i]);
99 static void jpeg_table_header(MpegEncContext *s)
101 PutBitContext *p = &s->pb;
107 put_bits(p, 16, 2 + 1 * (1 + 64));
108 put_bits(p, 4, 0); /* 8 bit precision */
109 put_bits(p, 4, 0); /* table 0 */
111 j = s->intra_scantable.permutated[i];
112 put_bits(p, 8, s->intra_matrix[j]);
118 ptr = put_bits_ptr(p);
119 put_bits(p, 16, 0); /* patched later */
121 size += put_huffman_table(p, 0, 0, avpriv_mjpeg_bits_dc_luminance,
122 avpriv_mjpeg_val_dc);
123 size += put_huffman_table(p, 0, 1, avpriv_mjpeg_bits_dc_chrominance,
124 avpriv_mjpeg_val_dc);
126 size += put_huffman_table(p, 1, 0, avpriv_mjpeg_bits_ac_luminance,
127 avpriv_mjpeg_val_ac_luminance);
128 size += put_huffman_table(p, 1, 1, avpriv_mjpeg_bits_ac_chrominance,
129 avpriv_mjpeg_val_ac_chrominance);
133 static void jpeg_put_comments(AVCodecContext *avctx, PutBitContext *p)
138 if (avctx->sample_aspect_ratio.num > 0 && avctx->sample_aspect_ratio.den > 0) {
142 avpriv_put_string(p, "JFIF", 1); /* this puts the trailing zero-byte too */
143 put_bits(p, 16, 0x0201); /* v 1.02 */
144 put_bits(p, 8, 0); /* units type: 0 - aspect ratio */
145 put_bits(p, 16, avctx->sample_aspect_ratio.num);
146 put_bits(p, 16, avctx->sample_aspect_ratio.den);
147 put_bits(p, 8, 0); /* thumbnail width */
148 put_bits(p, 8, 0); /* thumbnail height */
152 if (!(avctx->flags & CODEC_FLAG_BITEXACT)) {
155 ptr = put_bits_ptr(p);
156 put_bits(p, 16, 0); /* patched later */
157 avpriv_put_string(p, LIBAVCODEC_IDENT, 1);
158 size = strlen(LIBAVCODEC_IDENT)+3;
162 if (avctx->pix_fmt == AV_PIX_FMT_YUV420P ||
163 avctx->pix_fmt == AV_PIX_FMT_YUV422P ||
164 avctx->pix_fmt == AV_PIX_FMT_YUV444P) {
167 ptr = put_bits_ptr(p);
168 put_bits(p, 16, 0); /* patched later */
169 avpriv_put_string(p, "CS=ITU601", 1);
170 size = strlen("CS=ITU601")+3;
175 void ff_mjpeg_encode_picture_header(MpegEncContext *s)
177 const int lossless= s->avctx->codec_id != AV_CODEC_ID_MJPEG;
179 put_marker(&s->pb, SOI);
181 jpeg_put_comments(s->avctx, &s->pb);
183 jpeg_table_header(s);
185 switch(s->avctx->codec_id){
186 case AV_CODEC_ID_MJPEG: put_marker(&s->pb, SOF0 ); break;
187 case AV_CODEC_ID_LJPEG: put_marker(&s->pb, SOF3 ); break;
191 put_bits(&s->pb, 16, 17);
192 if(lossless && s->avctx->pix_fmt == AV_PIX_FMT_BGRA)
193 put_bits(&s->pb, 8, 9); /* 9 bits/component RCT */
195 put_bits(&s->pb, 8, 8); /* 8 bits/component */
196 put_bits(&s->pb, 16, s->height);
197 put_bits(&s->pb, 16, s->width);
198 put_bits(&s->pb, 8, 3); /* 3 components */
201 put_bits(&s->pb, 8, 1); /* component number */
202 put_bits(&s->pb, 4, s->mjpeg_hsample[0]); /* H factor */
203 put_bits(&s->pb, 4, s->mjpeg_vsample[0]); /* V factor */
204 put_bits(&s->pb, 8, 0); /* select matrix */
207 put_bits(&s->pb, 8, 2); /* component number */
208 put_bits(&s->pb, 4, s->mjpeg_hsample[1]); /* H factor */
209 put_bits(&s->pb, 4, s->mjpeg_vsample[1]); /* V factor */
210 put_bits(&s->pb, 8, 0); /* select matrix */
213 put_bits(&s->pb, 8, 3); /* component number */
214 put_bits(&s->pb, 4, s->mjpeg_hsample[2]); /* H factor */
215 put_bits(&s->pb, 4, s->mjpeg_vsample[2]); /* V factor */
216 put_bits(&s->pb, 8, 0); /* select matrix */
219 put_marker(&s->pb, SOS);
220 put_bits(&s->pb, 16, 12); /* length */
221 put_bits(&s->pb, 8, 3); /* 3 components */
224 put_bits(&s->pb, 8, 1); /* index */
225 put_bits(&s->pb, 4, 0); /* DC huffman table index */
226 put_bits(&s->pb, 4, 0); /* AC huffman table index */
229 put_bits(&s->pb, 8, 2); /* index */
230 put_bits(&s->pb, 4, 1); /* DC huffman table index */
231 put_bits(&s->pb, 4, lossless ? 0 : 1); /* AC huffman table index */
234 put_bits(&s->pb, 8, 3); /* index */
235 put_bits(&s->pb, 4, 1); /* DC huffman table index */
236 put_bits(&s->pb, 4, lossless ? 0 : 1); /* AC huffman table index */
238 put_bits(&s->pb, 8, lossless ? s->avctx->prediction_method+1 : 0); /* Ss (not used) */
240 switch(s->avctx->codec_id){
241 case AV_CODEC_ID_MJPEG: put_bits(&s->pb, 8, 63); break; /* Se (not used) */
242 case AV_CODEC_ID_LJPEG: put_bits(&s->pb, 8, 0); break; /* not used */
246 put_bits(&s->pb, 8, 0); /* Ah/Al (not used) */
249 static void escape_FF(MpegEncContext *s, int start)
251 int size= put_bits_count(&s->pb) - start*8;
253 uint8_t *buf= s->pb.buf + start;
254 int align= (-(size_t)(buf))&3;
256 assert((size&7) == 0);
260 for(i=0; i<size && i<align; i++){
261 if(buf[i]==0xFF) ff_count++;
263 for(; i<size-15; i+=16){
266 v= *(uint32_t*)(&buf[i]);
267 acc= (((v & (v>>4))&0x0F0F0F0F)+0x01010101)&0x10101010;
268 v= *(uint32_t*)(&buf[i+4]);
269 acc+=(((v & (v>>4))&0x0F0F0F0F)+0x01010101)&0x10101010;
270 v= *(uint32_t*)(&buf[i+8]);
271 acc+=(((v & (v>>4))&0x0F0F0F0F)+0x01010101)&0x10101010;
272 v= *(uint32_t*)(&buf[i+12]);
273 acc+=(((v & (v>>4))&0x0F0F0F0F)+0x01010101)&0x10101010;
281 if(buf[i]==0xFF) ff_count++;
284 if(ff_count==0) return;
286 flush_put_bits(&s->pb);
287 skip_put_bytes(&s->pb, ff_count);
289 for(i=size-1; ff_count; i--){
301 void ff_mjpeg_encode_stuffing(PutBitContext * pbc)
304 length= (-put_bits_count(pbc))&7;
305 if(length) put_bits(pbc, length, (1<<length)-1);
308 void ff_mjpeg_encode_picture_trailer(MpegEncContext *s)
310 ff_mjpeg_encode_stuffing(&s->pb);
311 flush_put_bits(&s->pb);
313 assert((s->header_bits&7)==0);
315 escape_FF(s, s->header_bits>>3);
317 put_marker(&s->pb, EOI);
320 void ff_mjpeg_encode_dc(MpegEncContext *s, int val,
321 uint8_t *huff_size, uint16_t *huff_code)
326 put_bits(&s->pb, huff_size[0], huff_code[0]);
334 nbits= av_log2_16bit(val) + 1;
336 put_bits(&s->pb, huff_size[nbits], huff_code[nbits]);
338 put_sbits(&s->pb, nbits, mant);
342 static void encode_block(MpegEncContext *s, int16_t *block, int n)
344 int mant, nbits, code, i, j;
345 int component, dc, run, last_index, val;
346 MJpegContext *m = s->mjpeg_ctx;
347 uint8_t *huff_size_ac;
348 uint16_t *huff_code_ac;
351 component = (n <= 3 ? 0 : (n&1) + 1);
352 dc = block[0]; /* overflow is impossible */
353 val = dc - s->last_dc[component];
355 ff_mjpeg_encode_dc(s, val, m->huff_size_dc_luminance, m->huff_code_dc_luminance);
356 huff_size_ac = m->huff_size_ac_luminance;
357 huff_code_ac = m->huff_code_ac_luminance;
359 ff_mjpeg_encode_dc(s, val, m->huff_size_dc_chrominance, m->huff_code_dc_chrominance);
360 huff_size_ac = m->huff_size_ac_chrominance;
361 huff_code_ac = m->huff_code_ac_chrominance;
363 s->last_dc[component] = dc;
368 last_index = s->block_last_index[n];
369 for(i=1;i<=last_index;i++) {
370 j = s->intra_scantable.permutated[i];
376 put_bits(&s->pb, huff_size_ac[0xf0], huff_code_ac[0xf0]);
385 nbits= av_log2(val) + 1;
386 code = (run << 4) | nbits;
388 put_bits(&s->pb, huff_size_ac[code], huff_code_ac[code]);
390 put_sbits(&s->pb, nbits, mant);
395 /* output EOB only if not already 64 values */
396 if (last_index < 63 || run != 0)
397 put_bits(&s->pb, huff_size_ac[0], huff_code_ac[0]);
400 void ff_mjpeg_encode_mb(MpegEncContext *s, int16_t block[6][64])
404 encode_block(s, block[i], i);
406 if (s->chroma_format == CHROMA_420) {
407 encode_block(s, block[5], 5);
409 encode_block(s, block[6], 6);
410 encode_block(s, block[5], 5);
411 encode_block(s, block[7], 7);
414 s->i_tex_bits += get_bits_diff(s);
417 AVCodec ff_mjpeg_encoder = {
419 .long_name = NULL_IF_CONFIG_SMALL("MJPEG (Motion JPEG)"),
420 .type = AVMEDIA_TYPE_VIDEO,
421 .id = AV_CODEC_ID_MJPEG,
422 .priv_data_size = sizeof(MpegEncContext),
423 .init = ff_MPV_encode_init,
424 .encode2 = ff_MPV_encode_picture,
425 .close = ff_MPV_encode_end,
426 .pix_fmts = (const enum AVPixelFormat[]){
427 AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_NONE