libavcodec/libopenjpeg.c

   1 /*
   2  * JPEG 2000 decoding support via OpenJPEG
   3  * Copyright (c) 2009 Jaikrishnan Menon <realityman@gmx.net>
   4  *
   5  * This file is part of FFmpeg.
   6  *
   7  * FFmpeg is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * FFmpeg is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with FFmpeg; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 /**
  23 * @file libavcodec/libopenjpeg.c
  24 * JPEG 2000 decoder using libopenjpeg
  25 */
  26
  27 #include "avcodec.h"
  28 #include "libavutil/intreadwrite.h"
  29 #define  OPJ_STATIC
  30 #include <openjpeg.h>
  31
  32 #define JP2_SIG_TYPE    0x6A502020
  33 #define JP2_SIG_VALUE   0x0D0A870A
  34
  35 typedef struct {
  36     opj_dparameters_t dec_params;
  37     AVFrame image;
  38 } LibOpenJPEGContext;
  39
  40 static int check_image_attributes(opj_image_t *image)
  41 {
  42     return(image->comps[0].dx == image->comps[1].dx &&
  43            image->comps[1].dx == image->comps[2].dx &&
  44            image->comps[0].dy == image->comps[1].dy &&
  45            image->comps[1].dy == image->comps[2].dy &&
  46            image->comps[0].prec == image->comps[1].prec &&
  47            image->comps[1].prec == image->comps[2].prec);
  48 }
  49
  50 static av_cold int libopenjpeg_decode_init(AVCodecContext *avctx)
  51 {
  52     LibOpenJPEGContext *ctx = avctx->priv_data;
  53
  54     opj_set_default_decoder_parameters(&ctx->dec_params);
  55     avctx->coded_frame = &ctx->image;
  56     return 0;
  57 }
  58
  59 static int libopenjpeg_decode_frame(AVCodecContext *avctx,
  60                                     void *data, int *data_size,
  61                                     AVPacket *avpkt)
  62 {
  63     const uint8_t *buf = avpkt->data;
  64     int buf_size = avpkt->size;
  65     LibOpenJPEGContext *ctx = avctx->priv_data;
  66     AVFrame *picture = &ctx->image, *output = data;
  67     opj_dinfo_t *dec;
  68     opj_cio_t *stream;
  69     opj_image_t *image;
  70     int width, height, has_alpha = 0, ret = -1;
  71     int x, y, index;
  72     uint8_t *img_ptr;
  73     int adjust[4];
  74
  75     *data_size = 0;
  76
  77     // Check if input is a raw jpeg2k codestream or in jp2 wrapping
  78     if((AV_RB32(buf) == 12) &&
  79        (AV_RB32(buf + 4) == JP2_SIG_TYPE) &&
  80        (AV_RB32(buf + 8) == JP2_SIG_VALUE)) {
  81          dec = opj_create_decompress(CODEC_JP2);
  82     } else {
  83          dec = opj_create_decompress(CODEC_J2K);
  84     }
  85
  86     if(!dec) {
  87         av_log(avctx, AV_LOG_ERROR, "Error initializing decoder.\n");
  88         return -1;
  89     }
  90     opj_set_event_mgr((opj_common_ptr)dec, NULL, NULL);
  91
  92     ctx->dec_params.cp_reduce = avctx->lowres;
  93     // Tie decoder with decoding parameters
  94     opj_setup_decoder(dec, &ctx->dec_params);
  95     stream = opj_cio_open((opj_common_ptr)dec, buf, buf_size);
  96     if(!stream) {
  97         av_log(avctx, AV_LOG_ERROR, "Codestream could not be opened for reading.\n");
  98         opj_destroy_decompress(dec);
  99         return -1;
 100     }
 101
 102     // Decode the codestream
 103     image = opj_decode_with_info(dec, stream, NULL);
 104     opj_cio_close(stream);
 105     if(!image) {
 106         av_log(avctx, AV_LOG_ERROR, "Error decoding codestream.\n");
 107         opj_destroy_decompress(dec);
 108         return -1;
 109     }
 110     width  = image->comps[0].w << avctx->lowres;
 111     height = image->comps[0].h << avctx->lowres;
 112     if(avcodec_check_dimensions(avctx, width, height) < 0) {
 113         av_log(avctx, AV_LOG_ERROR, "%dx%d dimension invalid.\n", width, height);
 114         goto done;
 115     }
 116     avcodec_set_dimensions(avctx, width, height);
 117
 118     switch(image->numcomps)
 119     {
 120         case 1:  avctx->pix_fmt = PIX_FMT_GRAY8;
 121                  break;
 122         case 3:  if(check_image_attributes(image)) {
 123                      avctx->pix_fmt = PIX_FMT_RGB24;
 124                  } else {
 125                      avctx->pix_fmt = PIX_FMT_GRAY8;
 126                      av_log(avctx, AV_LOG_ERROR, "Only first component will be used.\n");
 127                  }
 128                  break;
 129         case 4:  has_alpha = 1;
 130                  avctx->pix_fmt = PIX_FMT_RGB32;
 131                  break;
 132         default: av_log(avctx, AV_LOG_ERROR, "%d components unsupported.\n", image->numcomps);
 133                  goto done;
 134     }
 135
 136     if(picture->data[0])
 137         avctx->release_buffer(avctx, picture);
 138
 139     if(avctx->get_buffer(avctx, picture) < 0) {
 140         av_log(avctx, AV_LOG_ERROR, "Couldn't allocate image buffer.\n");
 141         return -1;
 142     }
 143
 144     for(x = 0; x < image->numcomps; x++) {
 145         adjust[x] = FFMAX(image->comps[x].prec - 8, 0);
 146     }
 147
 148     for(y = 0; y < avctx->height; y++) {
 149         index = y*avctx->width;
 150         img_ptr = picture->data[0] + y*picture->linesize[0];
 151         for(x = 0; x < avctx->width; x++, index++) {
 152             *img_ptr++ = image->comps[0].data[index] >> adjust[0];
 153             if(image->numcomps > 2 && check_image_attributes(image)) {
 154                 *img_ptr++ = image->comps[1].data[index] >> adjust[1];
 155                 *img_ptr++ = image->comps[2].data[index] >> adjust[2];
 156                 if(has_alpha)
 157                     *img_ptr++ = image->comps[3].data[index] >> adjust[3];
 158             }
 159         }
 160     }
 161
 162     *output    = ctx->image;
 163     *data_size = sizeof(AVPicture);
 164     ret = buf_size;
 165
 166 done:
 167     opj_image_destroy(image);
 168     opj_destroy_decompress(dec);
 169     return ret;
 170 }
 171
 172 static av_cold int libopenjpeg_decode_close(AVCodecContext *avctx)
 173 {
 174     LibOpenJPEGContext *ctx = avctx->priv_data;
 175
 176     if(ctx->image.data[0])
 177         avctx->release_buffer(avctx, &ctx->image);
 178     return 0 ;
 179 }
 180
 181
 182 AVCodec libopenjpeg_decoder = {
 183     "libopenjpeg",
 184     CODEC_TYPE_VIDEO,
 185     CODEC_ID_JPEG2000,
 186     sizeof(LibOpenJPEGContext),
 187     libopenjpeg_decode_init,
 188     NULL,
 189     libopenjpeg_decode_close,
 190     libopenjpeg_decode_frame,
 191     CODEC_CAP_DR1,
 192     .long_name = NULL_IF_CONFIG_SMALL("OpenJPEG based JPEG 2000 decoder"),
 193 } ;