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