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
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
40static 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_BGRA){
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 put_bits_ptr(&s->pb) - s->pb.buf;
185//    return (put_bits_count(&f->pb)+7)/8;
186}
187
188
189AVCodec ljpeg_encoder = { //FIXME avoid MPV_* lossless JPEG should not need them
190    "ljpeg",
191    AVMEDIA_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};
199