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