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 "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 };