j2k: restructure bitstream decoding
[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
30  * lossless JPEG encoder.
31  */
32
33 #include "avcodec.h"
34 #include "internal.h"
35 #include "mpegvideo.h"
36 #include "mjpeg.h"
37 #include "mjpegenc.h"
38
39
40 static int encode_picture_lossless(AVCodecContext *avctx, AVPacket *pkt,
41                                    const AVFrame *pict, int *got_packet)
42 {
43     MpegEncContext * const s = avctx->priv_data;
44     MJpegContext * const m = s->mjpeg_ctx;
45     const int width= s->width;
46     const int height= s->height;
47     AVFrame * const p = &s->current_picture.f;
48     const int predictor= avctx->prediction_method+1;
49     const int mb_width  = (width  + s->mjpeg_hsample[0] - 1) / s->mjpeg_hsample[0];
50     const int mb_height = (height + s->mjpeg_vsample[0] - 1) / s->mjpeg_vsample[0];
51     int ret, max_pkt_size = FF_MIN_BUFFER_SIZE;
52
53     if (avctx->pix_fmt == AV_PIX_FMT_BGRA)
54         max_pkt_size += width * height * 3 * 4;
55     else {
56         max_pkt_size += mb_width * mb_height * 3 * 4
57                         * s->mjpeg_hsample[0] * s->mjpeg_vsample[0];
58     }
59
60     if (!s->edge_emu_buffer &&
61         (ret = ff_mpv_frame_size_alloc(s, pict->linesize[0])) < 0) {
62         av_log(avctx, AV_LOG_ERROR, "failed to allocate context scratch buffers.\n");
63         return ret;
64     }
65
66     if ((ret = ff_alloc_packet2(avctx, pkt, max_pkt_size)) < 0)
67         return ret;
68
69     init_put_bits(&s->pb, pkt->data, pkt->size);
70
71     av_frame_unref(p);
72     ret = av_frame_ref(p, pict);
73     if (ret < 0)
74         return ret;
75     p->pict_type= AV_PICTURE_TYPE_I;
76     p->key_frame= 1;
77
78     ff_mjpeg_encode_picture_header(s);
79
80     s->header_bits= put_bits_count(&s->pb);
81
82     if(avctx->pix_fmt == AV_PIX_FMT_BGR0
83         || avctx->pix_fmt == AV_PIX_FMT_BGRA
84         || avctx->pix_fmt == AV_PIX_FMT_BGR24){
85         int x, y, i;
86         const int linesize= p->linesize[0];
87         uint16_t (*buffer)[4]= (void *) s->rd_scratchpad;
88         int left[3], top[3], topleft[3];
89
90         for(i=0; i<3; i++){
91             buffer[0][i]= 1 << (9 - 1);
92         }
93
94         for(y = 0; y < height; y++) {
95             const int modified_predictor= y ? predictor : 1;
96             uint8_t *ptr = p->data[0] + (linesize * y);
97
98             if(s->pb.buf_end - s->pb.buf - (put_bits_count(&s->pb)>>3) < width*3*4){
99                 av_log(s->avctx, AV_LOG_ERROR, "encoded frame too large\n");
100                 return -1;
101             }
102
103             for(i=0; i<3; i++){
104                 top[i]= left[i]= topleft[i]= buffer[0][i];
105             }
106             for(x = 0; x < width; x++) {
107                 if(avctx->pix_fmt == AV_PIX_FMT_BGR24){
108                     buffer[x][1] = ptr[3*x+0] - ptr[3*x+1] + 0x100;
109                     buffer[x][2] = ptr[3*x+2] - ptr[3*x+1] + 0x100;
110                     buffer[x][0] = (ptr[3*x+0] + 2*ptr[3*x+1] + ptr[3*x+2])>>2;
111                 }else{
112                 buffer[x][1] = ptr[4*x+0] - ptr[4*x+1] + 0x100;
113                 buffer[x][2] = ptr[4*x+2] - ptr[4*x+1] + 0x100;
114                 buffer[x][0] = (ptr[4*x+0] + 2*ptr[4*x+1] + ptr[4*x+2])>>2;
115                 }
116
117                 for(i=0;i<3;i++) {
118                     int pred, diff;
119
120                     PREDICT(pred, topleft[i], top[i], left[i], modified_predictor);
121
122                     topleft[i]= top[i];
123                     top[i]= buffer[x+1][i];
124
125                     left[i]= buffer[x][i];
126
127                     diff= ((left[i] - pred + 0x100)&0x1FF) - 0x100;
128
129                     if(i==0)
130                         ff_mjpeg_encode_dc(s, diff, m->huff_size_dc_luminance, m->huff_code_dc_luminance); //FIXME ugly
131                     else
132                         ff_mjpeg_encode_dc(s, diff, m->huff_size_dc_chrominance, m->huff_code_dc_chrominance);
133                 }
134             }
135         }
136     }else{
137         int mb_x, mb_y, i;
138
139         for(mb_y = 0; mb_y < mb_height; mb_y++) {
140             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]){
141                 av_log(s->avctx, AV_LOG_ERROR, "encoded frame too large\n");
142                 return -1;
143             }
144             for(mb_x = 0; mb_x < mb_width; mb_x++) {
145                 if(mb_x==0 || mb_y==0){
146                     for(i=0;i<3;i++) {
147                         uint8_t *ptr;
148                         int x, y, h, v, linesize;
149                         h = s->mjpeg_hsample[i];
150                         v = s->mjpeg_vsample[i];
151                         linesize= p->linesize[i];
152
153                         for(y=0; y<v; y++){
154                             for(x=0; x<h; x++){
155                                 int pred;
156
157                                 ptr = p->data[i] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
158                                 if(y==0 && mb_y==0){
159                                     if(x==0 && mb_x==0){
160                                         pred= 128;
161                                     }else{
162                                         pred= ptr[-1];
163                                     }
164                                 }else{
165                                     if(x==0 && mb_x==0){
166                                         pred= ptr[-linesize];
167                                     }else{
168                                         PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor);
169                                     }
170                                 }
171
172                                 if(i==0)
173                                     ff_mjpeg_encode_dc(s, *ptr - pred, m->huff_size_dc_luminance, m->huff_code_dc_luminance); //FIXME ugly
174                                 else
175                                     ff_mjpeg_encode_dc(s, *ptr - pred, m->huff_size_dc_chrominance, m->huff_code_dc_chrominance);
176                             }
177                         }
178                     }
179                 }else{
180                     for(i=0;i<3;i++) {
181                         uint8_t *ptr;
182                         int x, y, h, v, linesize;
183                         h = s->mjpeg_hsample[i];
184                         v = s->mjpeg_vsample[i];
185                         linesize= p->linesize[i];
186
187                         for(y=0; y<v; y++){
188                             for(x=0; x<h; x++){
189                                 int pred;
190
191                                 ptr = p->data[i] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
192                                 PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor);
193
194                                 if(i==0)
195                                     ff_mjpeg_encode_dc(s, *ptr - pred, m->huff_size_dc_luminance, m->huff_code_dc_luminance); //FIXME ugly
196                                 else
197                                     ff_mjpeg_encode_dc(s, *ptr - pred, m->huff_size_dc_chrominance, m->huff_code_dc_chrominance);
198                             }
199                         }
200                     }
201                 }
202             }
203         }
204     }
205
206     emms_c();
207     av_assert0(s->esc_pos == s->header_bits >> 3);
208     ff_mjpeg_encode_stuffing(s);
209     ff_mjpeg_encode_picture_trailer(s);
210     s->picture_number++;
211
212     flush_put_bits(&s->pb);
213     pkt->size   = put_bits_ptr(&s->pb) - s->pb.buf;
214     pkt->flags |= AV_PKT_FLAG_KEY;
215     *got_packet = 1;
216
217     return 0;
218 //    return (put_bits_count(&f->pb)+7)/8;
219 }
220
221
222 AVCodec ff_ljpeg_encoder = { //FIXME avoid MPV_* lossless JPEG should not need them
223     .name           = "ljpeg",
224     .type           = AVMEDIA_TYPE_VIDEO,
225     .id             = AV_CODEC_ID_LJPEG,
226     .priv_data_size = sizeof(MpegEncContext),
227     .init           = ff_MPV_encode_init,
228     .encode2        = encode_picture_lossless,
229     .close          = ff_MPV_encode_end,
230     .pix_fmts       = (const enum AVPixelFormat[]){
231         AV_PIX_FMT_BGR24, AV_PIX_FMT_BGRA, AV_PIX_FMT_BGR0,
232         AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ422P,
233         AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV422P,
234         AV_PIX_FMT_NONE},
235     .long_name      = NULL_IF_CONFIG_SMALL("Lossless JPEG"),
236 };