ffmpeg/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 "libavutil/frame.h"
  34 #include "libavutil/mem.h"
  35 #include "libavutil/pixdesc.h"
  36
  37 #include "avcodec.h"
  38 #include "idctdsp.h"
  39 #include "internal.h"
  40 #include "mjpegenc_common.h"
  41 #include "mpegvideo.h"
  42 #include "mjpeg.h"
  43 #include "mjpegenc.h"
  44
  45 typedef struct LJpegEncContext {
  46     IDCTDSPContext idsp;
  47     ScanTable scantable;
  48     uint16_t matrix[64];
  49
  50     int vsample[3];
  51     int hsample[3];
  52
  53     uint16_t huff_code_dc_luminance[12];
  54     uint16_t huff_code_dc_chrominance[12];
  55     uint8_t  huff_size_dc_luminance[12];
  56     uint8_t  huff_size_dc_chrominance[12];
  57
  58     uint16_t (*scratch)[4];
  59 } LJpegEncContext;
  60
  61 static int ljpeg_encode_bgr(AVCodecContext *avctx, PutBitContext *pb,
  62                             const AVFrame *frame)
  63 {
  64     LJpegEncContext *s    = avctx->priv_data;
  65     const int width       = frame->width;
  66     const int height      = frame->height;
  67     const int linesize    = frame->linesize[0];
  68     uint16_t (*buffer)[4] = s->scratch;
  69     const int predictor   = avctx->prediction_method+1;
  70     int left[3], top[3], topleft[3];
  71     int x, y, i;
  72
  73     for (i = 0; i < 3; i++)
  74         buffer[0][i] = 1 << (9 - 1);
  75
  76     for (y = 0; y < height; y++) {
  77         const int modified_predictor = y ? predictor : 1;
  78         uint8_t *ptr = frame->data[0] + (linesize * y);
  79
  80         if (pb->buf_end - pb->buf - (put_bits_count(pb) >> 3) < width * 3 * 4) {
  81             av_log(avctx, AV_LOG_ERROR, "encoded frame too large\n");
  82             return -1;
  83         }
  84
  85         for (i = 0; i < 3; i++)
  86             top[i]= left[i]= topleft[i]= buffer[0][i];
  87
  88         for (x = 0; x < width; x++) {
  89             if(avctx->pix_fmt == AV_PIX_FMT_BGR24){
  90                 buffer[x][1] =  ptr[3 * x + 0] -     ptr[3 * x + 1] + 0x100;
  91                 buffer[x][2] =  ptr[3 * x + 2] -     ptr[3 * x + 1] + 0x100;
  92                 buffer[x][0] = (ptr[3 * x + 0] + 2 * ptr[3 * x + 1] + ptr[3 * x + 2]) >> 2;
  93             }else{
  94                 buffer[x][1] =  ptr[4 * x + 0] -     ptr[4 * x + 1] + 0x100;
  95                 buffer[x][2] =  ptr[4 * x + 2] -     ptr[4 * x + 1] + 0x100;
  96                 buffer[x][0] = (ptr[4 * x + 0] + 2 * ptr[4 * x + 1] + ptr[4 * x + 2]) >> 2;
  97             }
  98
  99             for (i = 0; i < 3; i++) {
 100                 int pred, diff;
 101
 102                 PREDICT(pred, topleft[i], top[i], left[i], modified_predictor);
 103
 104                 topleft[i] = top[i];
 105                 top[i]     = buffer[x+1][i];
 106
 107                 left[i]    = buffer[x][i];
 108
 109                 diff       = ((left[i] - pred + 0x100) & 0x1FF) - 0x100;
 110
 111                 if (i == 0)
 112                     ff_mjpeg_encode_dc(pb, diff, s->huff_size_dc_luminance, s->huff_code_dc_luminance); //FIXME ugly
 113                 else
 114                     ff_mjpeg_encode_dc(pb, diff, s->huff_size_dc_chrominance, s->huff_code_dc_chrominance);
 115             }
 116         }
 117     }
 118
 119     return 0;
 120 }
 121
 122 static inline void ljpeg_encode_yuv_mb(LJpegEncContext *s, PutBitContext *pb,
 123                                        const AVFrame *frame, int predictor,
 124                                        int mb_x, int mb_y)
 125 {
 126     int i;
 127
 128     if (mb_x == 0 || mb_y == 0) {
 129         for (i = 0; i < 3; i++) {
 130             uint8_t *ptr;
 131             int x, y, h, v, linesize;
 132             h = s->hsample[i];
 133             v = s->vsample[i];
 134             linesize = frame->linesize[i];
 135
 136             for (y = 0; y < v; y++) {
 137                 for (x = 0; x < h; x++) {
 138                     int pred;
 139
 140                     ptr = frame->data[i] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
 141                     if (y == 0 && mb_y == 0) {
 142                         if (x == 0 && mb_x == 0)
 143                             pred = 128;
 144                         else
 145                             pred = ptr[-1];
 146                     } else {
 147                         if (x == 0 && mb_x == 0) {
 148                             pred = ptr[-linesize];
 149                         } else {
 150                             PREDICT(pred, ptr[-linesize - 1], ptr[-linesize],
 151                                     ptr[-1], predictor);
 152                         }
 153                     }
 154
 155                     if (i == 0)
 156                         ff_mjpeg_encode_dc(pb, *ptr - pred, s->huff_size_dc_luminance, s->huff_code_dc_luminance); //FIXME ugly
 157                     else
 158                         ff_mjpeg_encode_dc(pb, *ptr - pred, s->huff_size_dc_chrominance, s->huff_code_dc_chrominance);
 159                 }
 160             }
 161         }
 162     } else {
 163         for (i = 0; i < 3; i++) {
 164             uint8_t *ptr;
 165             int x, y, h, v, linesize;
 166             h = s->hsample[i];
 167             v = s->vsample[i];
 168             linesize = frame->linesize[i];
 169
 170             for (y = 0; y < v; y++) {
 171                 for (x = 0; x < h; x++) {
 172                     int pred;
 173
 174                     ptr = frame->data[i] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
 175                     PREDICT(pred, ptr[-linesize - 1], ptr[-linesize], ptr[-1], predictor);
 176
 177                     if (i == 0)
 178                         ff_mjpeg_encode_dc(pb, *ptr - pred, s->huff_size_dc_luminance, s->huff_code_dc_luminance); //FIXME ugly
 179                     else
 180                         ff_mjpeg_encode_dc(pb, *ptr - pred, s->huff_size_dc_chrominance, s->huff_code_dc_chrominance);
 181                 }
 182             }
 183         }
 184     }
 185 }
 186
 187 static int ljpeg_encode_yuv(AVCodecContext *avctx, PutBitContext *pb,
 188                             const AVFrame *frame)
 189 {
 190     const int predictor = avctx->prediction_method + 1;
 191     LJpegEncContext *s  = avctx->priv_data;
 192     const int mb_width  = (avctx->width  + s->hsample[0] - 1) / s->hsample[0];
 193     const int mb_height = (avctx->height + s->vsample[0] - 1) / s->vsample[0];
 194     int mb_x, mb_y;
 195
 196     for (mb_y = 0; mb_y < mb_height; mb_y++) {
 197         if (pb->buf_end - pb->buf - (put_bits_count(pb) >> 3) <
 198             mb_width * 4 * 3 * s->hsample[0] * s->vsample[0]) {
 199             av_log(avctx, AV_LOG_ERROR, "encoded frame too large\n");
 200             return -1;
 201         }
 202
 203         for (mb_x = 0; mb_x < mb_width; mb_x++)
 204             ljpeg_encode_yuv_mb(s, pb, frame, predictor, mb_x, mb_y);
 205     }
 206
 207     return 0;
 208 }
 209
 210 static int ljpeg_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
 211                               const AVFrame *pict, int *got_packet)
 212 {
 213     LJpegEncContext *s = avctx->priv_data;
 214     PutBitContext pb;
 215     const int width  = avctx->width;
 216     const int height = avctx->height;
 217     const int mb_width  = (width  + s->hsample[0] - 1) / s->hsample[0];
 218     const int mb_height = (height + s->vsample[0] - 1) / s->vsample[0];
 219     int max_pkt_size = FF_MIN_BUFFER_SIZE;
 220     int ret, header_bits;
 221
 222     if(    avctx->pix_fmt == AV_PIX_FMT_BGR0
 223         || avctx->pix_fmt == AV_PIX_FMT_BGRA
 224         || avctx->pix_fmt == AV_PIX_FMT_BGR24)
 225         max_pkt_size += width * height * 3 * 4;
 226     else {
 227         max_pkt_size += mb_width * mb_height * 3 * 4
 228                         * s->hsample[0] * s->vsample[0];
 229     }
 230
 231     if ((ret = ff_alloc_packet2(avctx, pkt, max_pkt_size)) < 0)
 232         return ret;
 233
 234     init_put_bits(&pb, pkt->data, pkt->size);
 235
 236     ff_mjpeg_encode_picture_header(avctx, &pb, &s->scantable,
 237                                    s->matrix, s->matrix);
 238
 239     header_bits = put_bits_count(&pb);
 240
 241     if(    avctx->pix_fmt == AV_PIX_FMT_BGR0
 242         || avctx->pix_fmt == AV_PIX_FMT_BGRA
 243         || avctx->pix_fmt == AV_PIX_FMT_BGR24)
 244         ret = ljpeg_encode_bgr(avctx, &pb, pict);
 245     else
 246         ret = ljpeg_encode_yuv(avctx, &pb, pict);
 247     if (ret < 0)
 248         return ret;
 249
 250     emms_c();
 251
 252     ff_mjpeg_escape_FF(&pb, header_bits >> 3);
 253     ff_mjpeg_encode_picture_trailer(&pb, header_bits);
 254
 255     flush_put_bits(&pb);
 256     pkt->size   = put_bits_ptr(&pb) - pb.buf;
 257     pkt->flags |= AV_PKT_FLAG_KEY;
 258     *got_packet = 1;
 259
 260     return 0;
 261 }
 262
 263 static av_cold int ljpeg_encode_close(AVCodecContext *avctx)
 264 {
 265     LJpegEncContext *s = avctx->priv_data;
 266
 267     av_frame_free(&avctx->coded_frame);
 268     av_freep(&s->scratch);
 269
 270     return 0;
 271 }
 272
 273 static av_cold int ljpeg_encode_init(AVCodecContext *avctx)
 274 {
 275     LJpegEncContext *s = avctx->priv_data;
 276
 277     if ((avctx->pix_fmt == AV_PIX_FMT_YUV420P ||
 278          avctx->pix_fmt == AV_PIX_FMT_YUV422P ||
 279          avctx->pix_fmt == AV_PIX_FMT_YUV444P ||
 280          avctx->color_range == AVCOL_RANGE_MPEG) &&
 281         avctx->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL) {
 282         av_log(avctx, AV_LOG_ERROR,
 283                "Limited range YUV is non-standard, set strict_std_compliance to "
 284                "at least unofficial to use it.\n");
 285         return AVERROR(EINVAL);
 286     }
 287
 288     avctx->coded_frame = av_frame_alloc();
 289     if (!avctx->coded_frame)
 290         return AVERROR(ENOMEM);
 291
 292     avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
 293     avctx->coded_frame->key_frame = 1;
 294
 295     s->scratch = av_malloc_array(avctx->width + 1, sizeof(*s->scratch));
 296
 297     ff_idctdsp_init(&s->idsp, avctx);
 298     ff_init_scantable(s->idsp.idct_permutation, &s->scantable,
 299                       ff_zigzag_direct);
 300
 301     ff_mjpeg_init_hvsample(avctx, s->hsample, s->vsample);
 302
 303     ff_mjpeg_build_huffman_codes(s->huff_size_dc_luminance,
 304                                  s->huff_code_dc_luminance,
 305                                  avpriv_mjpeg_bits_dc_luminance,
 306                                  avpriv_mjpeg_val_dc);
 307     ff_mjpeg_build_huffman_codes(s->huff_size_dc_chrominance,
 308                                  s->huff_code_dc_chrominance,
 309                                  avpriv_mjpeg_bits_dc_chrominance,
 310                                  avpriv_mjpeg_val_dc);
 311
 312     return 0;
 313 }
 314
 315 AVCodec ff_ljpeg_encoder = {
 316     .name           = "ljpeg",
 317     .long_name      = NULL_IF_CONFIG_SMALL("Lossless JPEG"),
 318     .type           = AVMEDIA_TYPE_VIDEO,
 319     .id             = AV_CODEC_ID_LJPEG,
 320     .priv_data_size = sizeof(LJpegEncContext),
 321     .init           = ljpeg_encode_init,
 322     .encode2        = ljpeg_encode_frame,
 323     .close          = ljpeg_encode_close,
 324     .capabilities   = CODEC_CAP_FRAME_THREADS | CODEC_CAP_INTRA_ONLY,
 325     .pix_fmts       = (const enum AVPixelFormat[]){
 326         AV_PIX_FMT_BGR24   , AV_PIX_FMT_BGRA    , AV_PIX_FMT_BGR0,
 327         AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ422P,
 328         AV_PIX_FMT_YUV420P , AV_PIX_FMT_YUV444P , AV_PIX_FMT_YUV422P,
 329         AV_PIX_FMT_NONE},
 330 };