2 * lossless JPEG shared bits
3 * Copyright (c) 2000, 2001 Fabrice Bellard
4 * Copyright (c) 2003 Alex Beregszaszi
6 * This file is part of FFmpeg.
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
26 #include "libavutil/common.h"
27 #include "libavutil/pixdesc.h"
28 #include "libavutil/pixfmt.h"
32 #include "jpegtables.h"
35 #include "mjpegenc_common.h"
38 /* table_class: 0 = DC coef, 1 = AC coefs */
39 static int put_huffman_table(PutBitContext *p, int table_class, int table_id,
40 const uint8_t *bits_table, const uint8_t *value_table)
44 put_bits(p, 4, table_class);
45 put_bits(p, 4, table_id);
50 put_bits(p, 8, bits_table[i]);
54 put_bits(p, 8, value_table[i]);
59 static void jpeg_table_header(AVCodecContext *avctx, PutBitContext *p,
60 ScanTable *intra_scantable,
61 uint16_t luma_intra_matrix[64],
62 uint16_t chroma_intra_matrix[64],
67 MpegEncContext *s = avctx->priv_data;
69 if (avctx->codec_id != AV_CODEC_ID_LJPEG) {
70 int matrix_count = 1 + !!memcmp(luma_intra_matrix,
72 sizeof(luma_intra_matrix[0]) * 64);
73 if (s->force_duplicated_matrix)
77 put_bits(p, 16, 2 + matrix_count * (1 + 64));
78 put_bits(p, 4, 0); /* 8 bit precision */
79 put_bits(p, 4, 0); /* table 0 */
81 j = intra_scantable->permutated[i];
82 put_bits(p, 8, luma_intra_matrix[j]);
85 if (matrix_count > 1) {
86 put_bits(p, 4, 0); /* 8 bit precision */
87 put_bits(p, 4, 1); /* table 1 */
89 j = intra_scantable->permutated[i];
90 put_bits(p, 8, chroma_intra_matrix[j]);
95 if(avctx->active_thread_type & FF_THREAD_SLICE){
98 put_bits(p, 16, (avctx->width-1)/(8*hsample[0]) + 1);
104 ptr = put_bits_ptr(p);
105 put_bits(p, 16, 0); /* patched later */
107 size += put_huffman_table(p, 0, 0, avpriv_mjpeg_bits_dc_luminance,
108 avpriv_mjpeg_val_dc);
109 size += put_huffman_table(p, 0, 1, avpriv_mjpeg_bits_dc_chrominance,
110 avpriv_mjpeg_val_dc);
112 size += put_huffman_table(p, 1, 0, avpriv_mjpeg_bits_ac_luminance,
113 avpriv_mjpeg_val_ac_luminance);
114 size += put_huffman_table(p, 1, 1, avpriv_mjpeg_bits_ac_chrominance,
115 avpriv_mjpeg_val_ac_chrominance);
119 static void jpeg_put_comments(AVCodecContext *avctx, PutBitContext *p)
124 if (avctx->sample_aspect_ratio.num > 0 && avctx->sample_aspect_ratio.den > 0) {
125 AVRational sar = avctx->sample_aspect_ratio;
127 if (sar.num > 65535 || sar.den > 65535) {
128 if (!av_reduce(&sar.num, &sar.den, avctx->sample_aspect_ratio.num, avctx->sample_aspect_ratio.den, 65535))
129 av_log(avctx, AV_LOG_WARNING,
130 "Cannot store exact aspect ratio %d:%d\n",
131 avctx->sample_aspect_ratio.num,
132 avctx->sample_aspect_ratio.den);
138 avpriv_put_string(p, "JFIF", 1); /* this puts the trailing zero-byte too */
139 /* The most significant byte is used for major revisions, the least
140 * significant byte for minor revisions. Version 1.02 is the current
141 * released revision. */
142 put_bits(p, 16, 0x0102);
143 put_bits(p, 8, 0); /* units type: 0 - aspect ratio */
144 put_bits(p, 16, sar.num);
145 put_bits(p, 16, sar.den);
146 put_bits(p, 8, 0); /* thumbnail width */
147 put_bits(p, 8, 0); /* thumbnail height */
151 if (!(avctx->flags & AV_CODEC_FLAG_BITEXACT)) {
154 ptr = put_bits_ptr(p);
155 put_bits(p, 16, 0); /* patched later */
156 avpriv_put_string(p, LIBAVCODEC_IDENT, 1);
157 size = strlen(LIBAVCODEC_IDENT)+3;
161 if (((avctx->pix_fmt == AV_PIX_FMT_YUV420P ||
162 avctx->pix_fmt == AV_PIX_FMT_YUV422P ||
163 avctx->pix_fmt == AV_PIX_FMT_YUV444P) && avctx->color_range != AVCOL_RANGE_JPEG)
164 || avctx->color_range == AVCOL_RANGE_MPEG) {
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_init_hvsample(AVCodecContext *avctx, int hsample[4], int vsample[4])
177 int chroma_h_shift, chroma_v_shift;
179 av_pix_fmt_get_chroma_sub_sample(avctx->pix_fmt, &chroma_h_shift,
181 if (avctx->codec->id == AV_CODEC_ID_LJPEG &&
182 ( avctx->pix_fmt == AV_PIX_FMT_BGR0
183 || avctx->pix_fmt == AV_PIX_FMT_BGRA
184 || avctx->pix_fmt == AV_PIX_FMT_BGR24)) {
185 vsample[0] = hsample[0] =
186 vsample[1] = hsample[1] =
187 vsample[2] = hsample[2] =
188 vsample[3] = hsample[3] = 1;
189 } else if (avctx->pix_fmt == AV_PIX_FMT_YUV444P || avctx->pix_fmt == AV_PIX_FMT_YUVJ444P) {
190 vsample[0] = vsample[1] = vsample[2] = 2;
191 hsample[0] = hsample[1] = hsample[2] = 1;
194 vsample[1] = 2 >> chroma_v_shift;
195 vsample[2] = 2 >> chroma_v_shift;
197 hsample[1] = 2 >> chroma_h_shift;
198 hsample[2] = 2 >> chroma_h_shift;
202 void ff_mjpeg_encode_picture_header(AVCodecContext *avctx, PutBitContext *pb,
203 ScanTable *intra_scantable, int pred,
204 uint16_t luma_intra_matrix[64],
205 uint16_t chroma_intra_matrix[64])
207 const int lossless = avctx->codec_id != AV_CODEC_ID_MJPEG && avctx->codec_id != AV_CODEC_ID_AMV;
208 int hsample[4], vsample[4];
210 int components = 3 + (avctx->pix_fmt == AV_PIX_FMT_BGRA);
211 int chroma_matrix = !!memcmp(luma_intra_matrix,
213 sizeof(luma_intra_matrix[0])*64);
215 ff_mjpeg_init_hvsample(avctx, hsample, vsample);
219 // hack for AMV mjpeg format
220 if(avctx->codec_id == AV_CODEC_ID_AMV) goto end;
222 jpeg_put_comments(avctx, pb);
224 jpeg_table_header(avctx, pb, intra_scantable, luma_intra_matrix, chroma_intra_matrix, hsample);
226 switch (avctx->codec_id) {
227 case AV_CODEC_ID_MJPEG: put_marker(pb, SOF0 ); break;
228 case AV_CODEC_ID_LJPEG: put_marker(pb, SOF3 ); break;
229 default: av_assert0(0);
232 put_bits(pb, 16, 17);
233 if (lossless && ( avctx->pix_fmt == AV_PIX_FMT_BGR0
234 || avctx->pix_fmt == AV_PIX_FMT_BGRA
235 || avctx->pix_fmt == AV_PIX_FMT_BGR24))
236 put_bits(pb, 8, 9); /* 9 bits/component RCT */
238 put_bits(pb, 8, 8); /* 8 bits/component */
239 put_bits(pb, 16, avctx->height);
240 put_bits(pb, 16, avctx->width);
241 put_bits(pb, 8, components); /* 3 or 4 components */
244 put_bits(pb, 8, 1); /* component number */
245 put_bits(pb, 4, hsample[0]); /* H factor */
246 put_bits(pb, 4, vsample[0]); /* V factor */
247 put_bits(pb, 8, 0); /* select matrix */
250 put_bits(pb, 8, 2); /* component number */
251 put_bits(pb, 4, hsample[1]); /* H factor */
252 put_bits(pb, 4, vsample[1]); /* V factor */
253 put_bits(pb, 8, lossless ? 0 : chroma_matrix); /* select matrix */
256 put_bits(pb, 8, 3); /* component number */
257 put_bits(pb, 4, hsample[2]); /* H factor */
258 put_bits(pb, 4, vsample[2]); /* V factor */
259 put_bits(pb, 8, lossless ? 0 : chroma_matrix); /* select matrix */
261 if (components == 4) {
262 put_bits(pb, 8, 4); /* component number */
263 put_bits(pb, 4, hsample[3]); /* H factor */
264 put_bits(pb, 4, vsample[3]); /* V factor */
265 put_bits(pb, 8, 0); /* select matrix */
270 put_bits(pb, 16, 6 + 2*components); /* length */
271 put_bits(pb, 8, components); /* 3 components */
274 put_bits(pb, 8, 1); /* index */
275 put_bits(pb, 4, 0); /* DC huffman table index */
276 put_bits(pb, 4, 0); /* AC huffman table index */
279 put_bits(pb, 8, 2); /* index */
280 put_bits(pb, 4, 1); /* DC huffman table index */
281 put_bits(pb, 4, lossless ? 0 : 1); /* AC huffman table index */
284 put_bits(pb, 8, 3); /* index */
285 put_bits(pb, 4, 1); /* DC huffman table index */
286 put_bits(pb, 4, lossless ? 0 : 1); /* AC huffman table index */
288 if (components == 4) {
289 /* Alpha component */
290 put_bits(pb, 8, 4); /* index */
291 put_bits(pb, 4, 0); /* DC huffman table index */
292 put_bits(pb, 4, 0); /* AC huffman table index */
295 put_bits(pb, 8, lossless ? pred : 0); /* Ss (not used) */
297 switch (avctx->codec_id) {
298 case AV_CODEC_ID_MJPEG: put_bits(pb, 8, 63); break; /* Se (not used) */
299 case AV_CODEC_ID_LJPEG: put_bits(pb, 8, 0); break; /* not used */
300 default: av_assert0(0);
303 put_bits(pb, 8, 0); /* Ah/Al (not used) */
307 MpegEncContext *s = avctx->priv_data;
308 av_assert0(avctx->codec->priv_data_size == sizeof(MpegEncContext));
310 s->esc_pos = put_bits_count(pb) >> 3;
311 for(i=1; i<s->slice_context_count; i++)
312 s->thread_context[i]->esc_pos = 0;
316 void ff_mjpeg_escape_FF(PutBitContext *pb, int start)
320 uint8_t *buf = pb->buf + start;
321 int align= (-(size_t)(buf))&3;
322 int pad = (-put_bits_count(pb))&7;
325 put_bits(pb, pad, (1<<pad)-1);
328 size = put_bits_count(pb) - start * 8;
330 av_assert1((size&7) == 0);
334 for(i=0; i<size && i<align; i++){
335 if(buf[i]==0xFF) ff_count++;
337 for(; i<size-15; i+=16){
340 v= *(uint32_t*)(&buf[i]);
341 acc= (((v & (v>>4))&0x0F0F0F0F)+0x01010101)&0x10101010;
342 v= *(uint32_t*)(&buf[i+4]);
343 acc+=(((v & (v>>4))&0x0F0F0F0F)+0x01010101)&0x10101010;
344 v= *(uint32_t*)(&buf[i+8]);
345 acc+=(((v & (v>>4))&0x0F0F0F0F)+0x01010101)&0x10101010;
346 v= *(uint32_t*)(&buf[i+12]);
347 acc+=(((v & (v>>4))&0x0F0F0F0F)+0x01010101)&0x10101010;
355 if(buf[i]==0xFF) ff_count++;
358 if(ff_count==0) return;
361 skip_put_bytes(pb, ff_count);
363 for(i=size-1; ff_count; i--){
375 int ff_mjpeg_encode_stuffing(MpegEncContext *s)
378 PutBitContext *pbc = &s->pb;
379 int mb_y = s->mb_y - !s->mb_x;
381 int ret = ff_mpv_reallocate_putbitbuffer(s, put_bits_count(&s->pb) / 8 + 100,
382 put_bits_count(&s->pb) / 4 + 1000);
384 av_log(s->avctx, AV_LOG_ERROR, "Buffer reallocation failed\n");
388 ff_mjpeg_escape_FF(pbc, s->esc_pos);
390 if((s->avctx->active_thread_type & FF_THREAD_SLICE) && mb_y < s->mb_height)
391 put_marker(pbc, RST0 + (mb_y&7));
392 s->esc_pos = put_bits_count(pbc) >> 3;
396 s->last_dc[i] = 128 << s->intra_dc_precision;
401 void ff_mjpeg_encode_picture_trailer(PutBitContext *pb, int header_bits)
403 av_assert1((header_bits & 7) == 0);
408 void ff_mjpeg_encode_dc(PutBitContext *pb, int val,
409 uint8_t *huff_size, uint16_t *huff_code)
414 put_bits(pb, huff_size[0], huff_code[0]);
422 nbits= av_log2_16bit(val) + 1;
424 put_bits(pb, huff_size[nbits], huff_code[nbits]);
426 put_sbits(pb, nbits, mant);