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->rd_scratchpad) {
  61         int alloc_size = FFALIGN(FFABS(pict->linesize[0]) + 64, 32);
  62         s->me.scratchpad =
  63         s->rd_scratchpad = av_mallocz(alloc_size * 4 * 16 * 2);
  64         if (!s->rd_scratchpad) {
  65             av_log(avctx, AV_LOG_ERROR, "failed to allocate context scratch buffers.\n");
  66             return ret;
  67         }
  68     }
  69
  70     if ((ret = ff_alloc_packet2(avctx, pkt, max_pkt_size)) < 0)
  71         return ret;
  72
  73     init_put_bits(&s->pb, pkt->data, pkt->size);
  74
  75     av_frame_unref(p);
  76     ret = av_frame_ref(p, pict);
  77     if (ret < 0)
  78         return ret;
  79     p->pict_type= AV_PICTURE_TYPE_I;
  80     p->key_frame= 1;
  81
  82     ff_mjpeg_encode_picture_header(s);
  83
  84     s->header_bits= put_bits_count(&s->pb);
  85
  86     if(avctx->pix_fmt == AV_PIX_FMT_BGR0
  87         || avctx->pix_fmt == AV_PIX_FMT_BGRA
  88         || avctx->pix_fmt == AV_PIX_FMT_BGR24){
  89         int x, y, i;
  90         const int linesize= p->linesize[0];
  91         uint16_t (*buffer)[4]= (void *) s->rd_scratchpad;
  92         int left[3], top[3], topleft[3];
  93
  94         for(i=0; i<3; i++){
  95             buffer[0][i]= 1 << (9 - 1);
  96         }
  97
  98         for(y = 0; y < height; y++) {
  99             const int modified_predictor= y ? predictor : 1;
 100             uint8_t *ptr = p->data[0] + (linesize * y);
 101
 102             if(s->pb.buf_end - s->pb.buf - (put_bits_count(&s->pb)>>3) < width*3*4){
 103                 av_log(s->avctx, AV_LOG_ERROR, "encoded frame too large\n");
 104                 return -1;
 105             }
 106
 107             for(i=0; i<3; i++){
 108                 top[i]= left[i]= topleft[i]= buffer[0][i];
 109             }
 110             for(x = 0; x < width; x++) {
 111                 if(avctx->pix_fmt == AV_PIX_FMT_BGR24){
 112                     buffer[x][1] = ptr[3*x+0] - ptr[3*x+1] + 0x100;
 113                     buffer[x][2] = ptr[3*x+2] - ptr[3*x+1] + 0x100;
 114                     buffer[x][0] = (ptr[3*x+0] + 2*ptr[3*x+1] + ptr[3*x+2])>>2;
 115                 }else{
 116                 buffer[x][1] = ptr[4*x+0] - ptr[4*x+1] + 0x100;
 117                 buffer[x][2] = ptr[4*x+2] - ptr[4*x+1] + 0x100;
 118                 buffer[x][0] = (ptr[4*x+0] + 2*ptr[4*x+1] + ptr[4*x+2])>>2;
 119                 }
 120
 121                 for(i=0;i<3;i++) {
 122                     int pred, diff;
 123
 124                     PREDICT(pred, topleft[i], top[i], left[i], modified_predictor);
 125
 126                     topleft[i]= top[i];
 127                     top[i]= buffer[x+1][i];
 128
 129                     left[i]= buffer[x][i];
 130
 131                     diff= ((left[i] - pred + 0x100)&0x1FF) - 0x100;
 132
 133                     if(i==0)
 134                         ff_mjpeg_encode_dc(s, diff, m->huff_size_dc_luminance, m->huff_code_dc_luminance); //FIXME ugly
 135                     else
 136                         ff_mjpeg_encode_dc(s, diff, m->huff_size_dc_chrominance, m->huff_code_dc_chrominance);
 137                 }
 138             }
 139         }
 140     }else{
 141         int mb_x, mb_y, i;
 142
 143         for(mb_y = 0; mb_y < mb_height; mb_y++) {
 144             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]){
 145                 av_log(s->avctx, AV_LOG_ERROR, "encoded frame too large\n");
 146                 return -1;
 147             }
 148             for(mb_x = 0; mb_x < mb_width; mb_x++) {
 149                 if(mb_x==0 || mb_y==0){
 150                     for(i=0;i<3;i++) {
 151                         uint8_t *ptr;
 152                         int x, y, h, v, linesize;
 153                         h = s->mjpeg_hsample[i];
 154                         v = s->mjpeg_vsample[i];
 155                         linesize= p->linesize[i];
 156
 157                         for(y=0; y<v; y++){
 158                             for(x=0; x<h; x++){
 159                                 int pred;
 160
 161                                 ptr = p->data[i] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
 162                                 if(y==0 && mb_y==0){
 163                                     if(x==0 && mb_x==0){
 164                                         pred= 128;
 165                                     }else{
 166                                         pred= ptr[-1];
 167                                     }
 168                                 }else{
 169                                     if(x==0 && mb_x==0){
 170                                         pred= ptr[-linesize];
 171                                     }else{
 172                                         PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor);
 173                                     }
 174                                 }
 175
 176                                 if(i==0)
 177                                     ff_mjpeg_encode_dc(s, *ptr - pred, m->huff_size_dc_luminance, m->huff_code_dc_luminance); //FIXME ugly
 178                                 else
 179                                     ff_mjpeg_encode_dc(s, *ptr - pred, m->huff_size_dc_chrominance, m->huff_code_dc_chrominance);
 180                             }
 181                         }
 182                     }
 183                 }else{
 184                     for(i=0;i<3;i++) {
 185                         uint8_t *ptr;
 186                         int x, y, h, v, linesize;
 187                         h = s->mjpeg_hsample[i];
 188                         v = s->mjpeg_vsample[i];
 189                         linesize= p->linesize[i];
 190
 191                         for(y=0; y<v; y++){
 192                             for(x=0; x<h; x++){
 193                                 int pred;
 194
 195                                 ptr = p->data[i] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
 196                                 PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor);
 197
 198                                 if(i==0)
 199                                     ff_mjpeg_encode_dc(s, *ptr - pred, m->huff_size_dc_luminance, m->huff_code_dc_luminance); //FIXME ugly
 200                                 else
 201                                     ff_mjpeg_encode_dc(s, *ptr - pred, m->huff_size_dc_chrominance, m->huff_code_dc_chrominance);
 202                             }
 203                         }
 204                     }
 205                 }
 206             }
 207         }
 208     }
 209
 210     emms_c();
 211     av_assert0(s->esc_pos == s->header_bits >> 3);
 212     ff_mjpeg_encode_stuffing(s);
 213     ff_mjpeg_encode_picture_trailer(s);
 214     s->picture_number++;
 215
 216     flush_put_bits(&s->pb);
 217     pkt->size   = put_bits_ptr(&s->pb) - s->pb.buf;
 218     pkt->flags |= AV_PKT_FLAG_KEY;
 219     *got_packet = 1;
 220
 221     return 0;
 222 //    return (put_bits_count(&f->pb)+7)/8;
 223 }
 224
 225
 226 AVCodec ff_ljpeg_encoder = { //FIXME avoid MPV_* lossless JPEG should not need them
 227     .name           = "ljpeg",
 228     .long_name      = NULL_IF_CONFIG_SMALL("Lossless JPEG"),
 229     .type           = AVMEDIA_TYPE_VIDEO,
 230     .id             = AV_CODEC_ID_LJPEG,
 231     .priv_data_size = sizeof(MpegEncContext),
 232     .init           = ff_MPV_encode_init,
 233     .encode2        = encode_picture_lossless,
 234     .close          = ff_MPV_encode_end,
 235     .pix_fmts       = (const enum AVPixelFormat[]){
 236         AV_PIX_FMT_BGR24, AV_PIX_FMT_BGRA, AV_PIX_FMT_BGR0,
 237         AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ422P,
 238         AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV422P,
 239         AV_PIX_FMT_NONE},
 240 };