cosmetics: Remove pointless period after copyright statement non-sentences.
[ffmpeg.git] / libavcodec / ljpegenc.c
1 /*
2  * lossless JPEG encoder
3  * Copyright (c) 2000, 2001 Fabrice Bellard
4  * Copyright (c) 2003 Alex Beregszaszi
5  * Copyright (c) 2003-2004 Michael Niedermayer
6  *
7  * Support for external huffman table, various fixes (AVID workaround),
8  * aspecting, new decode_frame mechanism and apple mjpeg-b support
9  *                                  by Alex Beregszaszi
10  *
11  * This file is part of FFmpeg.
12  *
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.
17  *
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.
22  *
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
26  */
27
28 /**
29  * @file ljpegenc.c
30  * lossless JPEG encoder.
31  */
32
33 #include "avcodec.h"
34 #include "dsputil.h"
35 #include "mpegvideo.h"
36 #include "mjpeg.h"
37 #include "mjpegenc.h"
38
39
40 static int encode_picture_lossless(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){
41     MpegEncContext * const s = avctx->priv_data;
42     MJpegContext * const m = s->mjpeg_ctx;
43     AVFrame *pict = data;
44     const int width= s->width;
45     const int height= s->height;
46     AVFrame * const p= (AVFrame*)&s->current_picture;
47     const int predictor= avctx->prediction_method+1;
48
49     init_put_bits(&s->pb, buf, buf_size);
50
51     *p = *pict;
52     p->pict_type= FF_I_TYPE;
53     p->key_frame= 1;
54
55     ff_mjpeg_encode_picture_header(s);
56
57     s->header_bits= put_bits_count(&s->pb);
58
59     if(avctx->pix_fmt == PIX_FMT_RGB32){
60         int x, y, i;
61         const int linesize= p->linesize[0];
62         uint16_t (*buffer)[4]= (void *) s->rd_scratchpad;
63         int left[3], top[3], topleft[3];
64
65         for(i=0; i<3; i++){
66             buffer[0][i]= 1 << (9 - 1);
67         }
68
69         for(y = 0; y < height; y++) {
70             const int modified_predictor= y ? predictor : 1;
71             uint8_t *ptr = p->data[0] + (linesize * y);
72
73             if(s->pb.buf_end - s->pb.buf - (put_bits_count(&s->pb)>>3) < width*3*4){
74                 av_log(s->avctx, AV_LOG_ERROR, "encoded frame too large\n");
75                 return -1;
76             }
77
78             for(i=0; i<3; i++){
79                 top[i]= left[i]= topleft[i]= buffer[0][i];
80             }
81             for(x = 0; x < width; x++) {
82                 buffer[x][1] = ptr[4*x+0] - ptr[4*x+1] + 0x100;
83                 buffer[x][2] = ptr[4*x+2] - ptr[4*x+1] + 0x100;
84                 buffer[x][0] = (ptr[4*x+0] + 2*ptr[4*x+1] + ptr[4*x+2])>>2;
85
86                 for(i=0;i<3;i++) {
87                     int pred, diff;
88
89                     PREDICT(pred, topleft[i], top[i], left[i], modified_predictor);
90
91                     topleft[i]= top[i];
92                     top[i]= buffer[x+1][i];
93
94                     left[i]= buffer[x][i];
95
96                     diff= ((left[i] - pred + 0x100)&0x1FF) - 0x100;
97
98                     if(i==0)
99                         ff_mjpeg_encode_dc(s, diff, m->huff_size_dc_luminance, m->huff_code_dc_luminance); //FIXME ugly
100                     else
101                         ff_mjpeg_encode_dc(s, diff, m->huff_size_dc_chrominance, m->huff_code_dc_chrominance);
102                 }
103             }
104         }
105     }else{
106         int mb_x, mb_y, i;
107         const int mb_width  = (width  + s->mjpeg_hsample[0] - 1) / s->mjpeg_hsample[0];
108         const int mb_height = (height + s->mjpeg_vsample[0] - 1) / s->mjpeg_vsample[0];
109
110         for(mb_y = 0; mb_y < mb_height; mb_y++) {
111             if(s->pb.buf_end - s->pb.buf - (put_bits_count(&s->pb)>>3) < mb_width * 4 * 3 * s->mjpeg_hsample[0] * s->mjpeg_vsample[0]){
112                 av_log(s->avctx, AV_LOG_ERROR, "encoded frame too large\n");
113                 return -1;
114             }
115             for(mb_x = 0; mb_x < mb_width; mb_x++) {
116                 if(mb_x==0 || mb_y==0){
117                     for(i=0;i<3;i++) {
118                         uint8_t *ptr;
119                         int x, y, h, v, linesize;
120                         h = s->mjpeg_hsample[i];
121                         v = s->mjpeg_vsample[i];
122                         linesize= p->linesize[i];
123
124                         for(y=0; y<v; y++){
125                             for(x=0; x<h; x++){
126                                 int pred;
127
128                                 ptr = p->data[i] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
129                                 if(y==0 && mb_y==0){
130                                     if(x==0 && mb_x==0){
131                                         pred= 128;
132                                     }else{
133                                         pred= ptr[-1];
134                                     }
135                                 }else{
136                                     if(x==0 && mb_x==0){
137                                         pred= ptr[-linesize];
138                                     }else{
139                                         PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor);
140                                     }
141                                 }
142
143                                 if(i==0)
144                                     ff_mjpeg_encode_dc(s, *ptr - pred, m->huff_size_dc_luminance, m->huff_code_dc_luminance); //FIXME ugly
145                                 else
146                                     ff_mjpeg_encode_dc(s, *ptr - pred, m->huff_size_dc_chrominance, m->huff_code_dc_chrominance);
147                             }
148                         }
149                     }
150                 }else{
151                     for(i=0;i<3;i++) {
152                         uint8_t *ptr;
153                         int x, y, h, v, linesize;
154                         h = s->mjpeg_hsample[i];
155                         v = s->mjpeg_vsample[i];
156                         linesize= p->linesize[i];
157
158                         for(y=0; y<v; y++){
159                             for(x=0; x<h; x++){
160                                 int pred;
161
162                                 ptr = p->data[i] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
163 //printf("%d %d %d %d %8X\n", mb_x, mb_y, x, y, ptr);
164                                 PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor);
165
166                                 if(i==0)
167                                     ff_mjpeg_encode_dc(s, *ptr - pred, m->huff_size_dc_luminance, m->huff_code_dc_luminance); //FIXME ugly
168                                 else
169                                     ff_mjpeg_encode_dc(s, *ptr - pred, m->huff_size_dc_chrominance, m->huff_code_dc_chrominance);
170                             }
171                         }
172                     }
173                 }
174             }
175         }
176     }
177
178     emms_c();
179
180     ff_mjpeg_encode_picture_trailer(s);
181     s->picture_number++;
182
183     flush_put_bits(&s->pb);
184     return pbBufPtr(&s->pb) - s->pb.buf;
185 //    return (put_bits_count(&f->pb)+7)/8;
186 }
187
188
189 AVCodec ljpeg_encoder = { //FIXME avoid MPV_* lossless JPEG should not need them
190     "ljpeg",
191     CODEC_TYPE_VIDEO,
192     CODEC_ID_LJPEG,
193     sizeof(MpegEncContext),
194     MPV_encode_init,
195     encode_picture_lossless,
196     MPV_encode_end,
197     .long_name = NULL_IF_CONFIG_SMALL("Lossless JPEG"),
198 };