git.sesse.net Git - ffmpeg/blob - 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 "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= AV_PICTURE_TYPE_I;
  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_BGR0
  60         || avctx->pix_fmt == PIX_FMT_BGRA
  61         || avctx->pix_fmt == PIX_FMT_BGR24){
  62         int x, y, i;
  63         const int linesize= p->linesize[0];
  64         uint16_t (*buffer)[4]= (void *) s->rd_scratchpad;
  65         int left[3], top[3], topleft[3];
  66
  67         for(i=0; i<3; i++){
  68             buffer[0][i]= 1 << (9 - 1);
  69         }
  70
  71         for(y = 0; y < height; y++) {
  72             const int modified_predictor= y ? predictor : 1;
  73             uint8_t *ptr = p->data[0] + (linesize * y);
  74
  75             if(s->pb.buf_end - s->pb.buf - (put_bits_count(&s->pb)>>3) < width*3*4){
  76                 av_log(s->avctx, AV_LOG_ERROR, "encoded frame too large\n");
  77                 return -1;
  78             }
  79
  80             for(i=0; i<3; i++){
  81                 top[i]= left[i]= topleft[i]= buffer[0][i];
  82             }
  83             for(x = 0; x < width; x++) {
  84                 if(avctx->pix_fmt == PIX_FMT_BGR24){
  85                     buffer[x][1] = ptr[3*x+0] - ptr[3*x+1] + 0x100;
  86                     buffer[x][2] = ptr[3*x+2] - ptr[3*x+1] + 0x100;
  87                     buffer[x][0] = (ptr[3*x+0] + 2*ptr[3*x+1] + ptr[3*x+2])>>2;
  88                 }else{
  89                 buffer[x][1] = ptr[4*x+0] - ptr[4*x+1] + 0x100;
  90                 buffer[x][2] = ptr[4*x+2] - ptr[4*x+1] + 0x100;
  91                 buffer[x][0] = (ptr[4*x+0] + 2*ptr[4*x+1] + ptr[4*x+2])>>2;
  92                 }
  93
  94                 for(i=0;i<3;i++) {
  95                     int pred, diff;
  96
  97                     PREDICT(pred, topleft[i], top[i], left[i], modified_predictor);
  98
  99                     topleft[i]= top[i];
 100                     top[i]= buffer[x+1][i];
 101
 102                     left[i]= buffer[x][i];
 103
 104                     diff= ((left[i] - pred + 0x100)&0x1FF) - 0x100;
 105
 106                     if(i==0)
 107                         ff_mjpeg_encode_dc(s, diff, m->huff_size_dc_luminance, m->huff_code_dc_luminance); //FIXME ugly
 108                     else
 109                         ff_mjpeg_encode_dc(s, diff, m->huff_size_dc_chrominance, m->huff_code_dc_chrominance);
 110                 }
 111             }
 112         }
 113     }else{
 114         int mb_x, mb_y, i;
 115         const int mb_width  = (width  + s->mjpeg_hsample[0] - 1) / s->mjpeg_hsample[0];
 116         const int mb_height = (height + s->mjpeg_vsample[0] - 1) / s->mjpeg_vsample[0];
 117
 118         for(mb_y = 0; mb_y < mb_height; mb_y++) {
 119             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]){
 120                 av_log(s->avctx, AV_LOG_ERROR, "encoded frame too large\n");
 121                 return -1;
 122             }
 123             for(mb_x = 0; mb_x < mb_width; mb_x++) {
 124                 if(mb_x==0 || mb_y==0){
 125                     for(i=0;i<3;i++) {
 126                         uint8_t *ptr;
 127                         int x, y, h, v, linesize;
 128                         h = s->mjpeg_hsample[i];
 129                         v = s->mjpeg_vsample[i];
 130                         linesize= p->linesize[i];
 131
 132                         for(y=0; y<v; y++){
 133                             for(x=0; x<h; x++){
 134                                 int pred;
 135
 136                                 ptr = p->data[i] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
 137                                 if(y==0 && mb_y==0){
 138                                     if(x==0 && mb_x==0){
 139                                         pred= 128;
 140                                     }else{
 141                                         pred= ptr[-1];
 142                                     }
 143                                 }else{
 144                                     if(x==0 && mb_x==0){
 145                                         pred= ptr[-linesize];
 146                                     }else{
 147                                         PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor);
 148                                     }
 149                                 }
 150
 151                                 if(i==0)
 152                                     ff_mjpeg_encode_dc(s, *ptr - pred, m->huff_size_dc_luminance, m->huff_code_dc_luminance); //FIXME ugly
 153                                 else
 154                                     ff_mjpeg_encode_dc(s, *ptr - pred, m->huff_size_dc_chrominance, m->huff_code_dc_chrominance);
 155                             }
 156                         }
 157                     }
 158                 }else{
 159                     for(i=0;i<3;i++) {
 160                         uint8_t *ptr;
 161                         int x, y, h, v, linesize;
 162                         h = s->mjpeg_hsample[i];
 163                         v = s->mjpeg_vsample[i];
 164                         linesize= p->linesize[i];
 165
 166                         for(y=0; y<v; y++){
 167                             for(x=0; x<h; x++){
 168                                 int pred;
 169
 170                                 ptr = p->data[i] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
 171 //printf("%d %d %d %d %8X\n", mb_x, mb_y, x, y, ptr);
 172                                 PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor);
 173
 174                                 if(i==0)
 175                                     ff_mjpeg_encode_dc(s, *ptr - pred, m->huff_size_dc_luminance, m->huff_code_dc_luminance); //FIXME ugly
 176                                 else
 177                                     ff_mjpeg_encode_dc(s, *ptr - pred, m->huff_size_dc_chrominance, m->huff_code_dc_chrominance);
 178                             }
 179                         }
 180                     }
 181                 }
 182             }
 183         }
 184     }
 185
 186     emms_c();
 187
 188     ff_mjpeg_encode_picture_trailer(s);
 189     s->picture_number++;
 190
 191     flush_put_bits(&s->pb);
 192     return put_bits_ptr(&s->pb) - s->pb.buf;
 193 //    return (put_bits_count(&f->pb)+7)/8;
 194 }
 195
 196
 197 AVCodec ff_ljpeg_encoder = { //FIXME avoid MPV_* lossless JPEG should not need them
 198     .name           = "ljpeg",
 199     .type           = AVMEDIA_TYPE_VIDEO,
 200     .id             = CODEC_ID_LJPEG,
 201     .priv_data_size = sizeof(MpegEncContext),
 202     .init           = MPV_encode_init,
 203     .encode         = encode_picture_lossless,
 204     .close          = MPV_encode_end,
 205     .long_name      = NULL_IF_CONFIG_SMALL("Lossless JPEG"),
 206 };