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 Libav.
  12  *
  13  * Libav 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  * Libav 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 Libav; 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 "libavutil/frame.h"
  34 #include "libavutil/mem.h"
  35 #include "libavutil/pixdesc.h"
  36
  37 #include "avcodec.h"
  38 #include "dsputil.h"
  39 #include "internal.h"
  40 #include "mpegvideo.h"
  41 #include "mjpeg.h"
  42 #include "mjpegenc.h"
  43
  44 typedef struct LJpegEncContext {
  45     DSPContext dsp;
  46     ScanTable scantable;
  47     uint16_t matrix[64];
  48
  49     int vsample[3];
  50     int hsample[3];
  51
  52     uint16_t huff_code_dc_luminance[12];
  53     uint16_t huff_code_dc_chrominance[12];
  54     uint8_t  huff_size_dc_luminance[12];
  55     uint8_t  huff_size_dc_chrominance[12];
  56
  57     uint16_t (*scratch)[4];
  58 } LJpegEncContext;
  59
  60 static int ljpeg_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
  61                               const AVFrame *pict, int *got_packet)
  62 {
  63     LJpegEncContext *s = avctx->priv_data;
  64     PutBitContext pb;
  65     const int width  = avctx->width;
  66     const int height = avctx->height;
  67     const int predictor= avctx->prediction_method+1;
  68     const int mb_width  = (width  + s->hsample[0] - 1) / s->hsample[0];
  69     const int mb_height = (height + s->vsample[0] - 1) / s->vsample[0];
  70     int max_pkt_size = FF_MIN_BUFFER_SIZE;
  71     int ret, header_bits;
  72
  73     if (avctx->pix_fmt == AV_PIX_FMT_BGR24)
  74         max_pkt_size += width * height * 3 * 3;
  75     else {
  76         max_pkt_size += mb_width * mb_height * 3 * 4
  77                         * s->hsample[0] * s->vsample[0];
  78     }
  79     if ((ret = ff_alloc_packet(pkt, max_pkt_size)) < 0) {
  80         av_log(avctx, AV_LOG_ERROR, "Error getting output packet of size %d.\n", max_pkt_size);
  81         return ret;
  82     }
  83
  84     init_put_bits(&pb, pkt->data, pkt->size);
  85
  86     ff_mjpeg_encode_picture_header(avctx, &pb, &s->scantable,
  87                                    s->matrix);
  88
  89     header_bits = put_bits_count(&pb);
  90
  91     if (avctx->pix_fmt == AV_PIX_FMT_BGR24) {
  92         int x, y, i;
  93         const int linesize = pict->linesize[0];
  94         uint16_t (*buffer)[4] = s->scratch;
  95         int left[3], top[3], topleft[3];
  96
  97         for(i=0; i<3; i++){
  98             buffer[0][i]= 1 << (9 - 1);
  99         }
 100
 101         for(y = 0; y < height; y++) {
 102             const int modified_predictor= y ? predictor : 1;
 103             uint8_t *ptr = pict->data[0] + (linesize * y);
 104
 105             if(pb.buf_end - pb.buf - (put_bits_count(&pb) >> 3) < width * 3 * 3) {
 106                 av_log(avctx, AV_LOG_ERROR, "encoded frame too large\n");
 107                 return -1;
 108             }
 109
 110             for(i=0; i<3; i++){
 111                 top[i]= left[i]= topleft[i]= buffer[0][i];
 112             }
 113             for(x = 0; x < width; x++) {
 114                 buffer[x][1] =  ptr[3 * x + 0] -     ptr[3 * x + 1] + 0x100;
 115                 buffer[x][2] =  ptr[3 * x + 2] -     ptr[3 * x + 1] + 0x100;
 116                 buffer[x][0] = (ptr[3 * x + 0] + 2 * ptr[3 * x + 1] + ptr[3 * x + 2]) >> 2;
 117
 118                 for(i=0;i<3;i++) {
 119                     int pred, diff;
 120
 121                     PREDICT(pred, topleft[i], top[i], left[i], modified_predictor);
 122
 123                     topleft[i]= top[i];
 124                     top[i]= buffer[x+1][i];
 125
 126                     left[i]= buffer[x][i];
 127
 128                     diff= ((left[i] - pred + 0x100)&0x1FF) - 0x100;
 129
 130                     if(i==0)
 131                         ff_mjpeg_encode_dc(&pb, diff, s->huff_size_dc_luminance, s->huff_code_dc_luminance); //FIXME ugly
 132                     else
 133                         ff_mjpeg_encode_dc(&pb, diff, s->huff_size_dc_chrominance, s->huff_code_dc_chrominance);
 134                 }
 135             }
 136         }
 137     }else{
 138         int mb_x, mb_y, i;
 139
 140         for(mb_y = 0; mb_y < mb_height; mb_y++) {
 141             if (pb.buf_end - pb.buf - (put_bits_count(&pb) >> 3) <
 142                 mb_width * 4 * 3 * s->hsample[0] * s->vsample[0]) {
 143                 av_log(avctx, AV_LOG_ERROR, "encoded frame too large\n");
 144                 return -1;
 145             }
 146             for(mb_x = 0; mb_x < mb_width; mb_x++) {
 147                 if(mb_x==0 || mb_y==0){
 148                     for(i=0;i<3;i++) {
 149                         uint8_t *ptr;
 150                         int x, y, h, v, linesize;
 151                         h = s->hsample[i];
 152                         v = s->vsample[i];
 153                         linesize = pict->linesize[i];
 154
 155                         for(y=0; y<v; y++){
 156                             for(x=0; x<h; x++){
 157                                 int pred;
 158
 159                                 ptr = pict->data[i] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
 160                                 if(y==0 && mb_y==0){
 161                                     if(x==0 && mb_x==0){
 162                                         pred= 128;
 163                                     }else{
 164                                         pred= ptr[-1];
 165                                     }
 166                                 }else{
 167                                     if(x==0 && mb_x==0){
 168                                         pred= ptr[-linesize];
 169                                     }else{
 170                                         PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor);
 171                                     }
 172                                 }
 173
 174                                 if(i==0)
 175                                     ff_mjpeg_encode_dc(&pb, *ptr - pred, s->huff_size_dc_luminance, s->huff_code_dc_luminance); //FIXME ugly
 176                                 else
 177                                     ff_mjpeg_encode_dc(&pb, *ptr - pred, s->huff_size_dc_chrominance, s->huff_code_dc_chrominance);
 178                             }
 179                         }
 180                     }
 181                 }else{
 182                     for(i=0;i<3;i++) {
 183                         uint8_t *ptr;
 184                         int x, y, h, v, linesize;
 185                         h = s->hsample[i];
 186                         v = s->vsample[i];
 187                         linesize = pict->linesize[i];
 188
 189                         for(y=0; y<v; y++){
 190                             for(x=0; x<h; x++){
 191                                 int pred;
 192
 193                                 ptr = pict->data[i] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
 194                                 PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor);
 195
 196                                 if(i==0)
 197                                     ff_mjpeg_encode_dc(&pb, *ptr - pred, s->huff_size_dc_luminance, s->huff_code_dc_luminance); //FIXME ugly
 198                                 else
 199                                     ff_mjpeg_encode_dc(&pb, *ptr - pred, s->huff_size_dc_chrominance, s->huff_code_dc_chrominance);
 200                             }
 201                         }
 202                     }
 203                 }
 204             }
 205         }
 206     }
 207
 208     emms_c();
 209
 210     ff_mjpeg_encode_picture_trailer(&pb, header_bits);
 211
 212     flush_put_bits(&pb);
 213     pkt->size   = put_bits_ptr(&pb) - pb.buf;
 214     pkt->flags |= AV_PKT_FLAG_KEY;
 215     *got_packet = 1;
 216
 217     return 0;
 218 }
 219
 220 static av_cold int ljpeg_encode_close(AVCodecContext *avctx)
 221 {
 222     LJpegEncContext *s = avctx->priv_data;
 223
 224     av_frame_free(&avctx->coded_frame);
 225     av_freep(&s->scratch);
 226
 227     return 0;
 228 }
 229
 230 static av_cold int ljpeg_encode_init(AVCodecContext *avctx)
 231 {
 232     LJpegEncContext *s = avctx->priv_data;
 233     int chroma_v_shift, chroma_h_shift;
 234
 235     if ((avctx->pix_fmt == AV_PIX_FMT_YUV420P ||
 236          avctx->pix_fmt == AV_PIX_FMT_YUV422P ||
 237          avctx->pix_fmt == AV_PIX_FMT_YUV444P) &&
 238         avctx->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL) {
 239         av_log(avctx, AV_LOG_ERROR,
 240                "Limited range YUV is non-standard, set strict_std_compliance to "
 241                "at least unofficial to use it.\n");
 242         return AVERROR(EINVAL);
 243     }
 244
 245     avctx->coded_frame = av_frame_alloc();
 246     if (!avctx->coded_frame)
 247         return AVERROR(ENOMEM);
 248
 249     avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
 250     avctx->coded_frame->key_frame = 1;
 251
 252     s->scratch = av_malloc_array(avctx->width + 1, sizeof(*s->scratch));
 253
 254     ff_dsputil_init(&s->dsp, avctx);
 255     ff_init_scantable(s->dsp.idct_permutation, &s->scantable, ff_zigzag_direct);
 256
 257     av_pix_fmt_get_chroma_sub_sample(avctx->pix_fmt, &chroma_h_shift,
 258                                      &chroma_v_shift);
 259
 260     if (avctx->pix_fmt   == AV_PIX_FMT_BGR24) {
 261         s->vsample[0] = s->hsample[0] =
 262         s->vsample[1] = s->hsample[1] =
 263         s->vsample[2] = s->hsample[2] = 1;
 264     } else {
 265         s->vsample[0] = 2;
 266         s->vsample[1] = 2 >> chroma_v_shift;
 267         s->vsample[2] = 2 >> chroma_v_shift;
 268         s->hsample[0] = 2;
 269         s->hsample[1] = 2 >> chroma_h_shift;
 270         s->hsample[2] = 2 >> chroma_h_shift;
 271     }
 272
 273     ff_mjpeg_build_huffman_codes(s->huff_size_dc_luminance,
 274                                  s->huff_code_dc_luminance,
 275                                  avpriv_mjpeg_bits_dc_luminance,
 276                                  avpriv_mjpeg_val_dc);
 277     ff_mjpeg_build_huffman_codes(s->huff_size_dc_chrominance,
 278                                  s->huff_code_dc_chrominance,
 279                                  avpriv_mjpeg_bits_dc_chrominance,
 280                                  avpriv_mjpeg_val_dc);
 281
 282     return 0;
 283 }
 284
 285 AVCodec ff_ljpeg_encoder = {
 286     .name           = "ljpeg",
 287     .long_name      = NULL_IF_CONFIG_SMALL("Lossless JPEG"),
 288     .type           = AVMEDIA_TYPE_VIDEO,
 289     .id             = AV_CODEC_ID_LJPEG,
 290     .priv_data_size = sizeof(LJpegEncContext),
 291     .init           = ljpeg_encode_init,
 292     .encode2        = ljpeg_encode_frame,
 293     .close          = ljpeg_encode_close,
 294     .pix_fmts       = (const enum AVPixelFormat[]){ AV_PIX_FMT_YUVJ420P,
 295                                                     AV_PIX_FMT_YUVJ422P,
 296                                                     AV_PIX_FMT_YUVJ444P,
 297                                                     AV_PIX_FMT_BGR24,
 298                                                     AV_PIX_FMT_YUV420P,
 299                                                     AV_PIX_FMT_YUV422P,
 300                                                     AV_PIX_FMT_YUVJ444P,
 301                                                     AV_PIX_FMT_NONE },
 302 };