2 * JPEG 2000 decoding support via OpenJPEG
3 * Copyright (c) 2009 Jaikrishnan Menon <realityman@gmx.net>
5 * This file is part of FFmpeg.
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.
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.
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
24 * JPEG 2000 decoder using libopenjpeg
27 #include "libavcore/imgutils.h"
29 #include "libavutil/intreadwrite.h"
33 #define JP2_SIG_TYPE 0x6A502020
34 #define JP2_SIG_VALUE 0x0D0A870A
37 opj_dparameters_t dec_params;
41 static int check_image_attributes(opj_image_t *image)
43 return image->comps[0].dx == image->comps[1].dx &&
44 image->comps[1].dx == image->comps[2].dx &&
45 image->comps[0].dy == image->comps[1].dy &&
46 image->comps[1].dy == image->comps[2].dy &&
47 image->comps[0].prec == image->comps[1].prec &&
48 image->comps[1].prec == image->comps[2].prec;
51 static av_cold int libopenjpeg_decode_init(AVCodecContext *avctx)
53 LibOpenJPEGContext *ctx = avctx->priv_data;
55 opj_set_default_decoder_parameters(&ctx->dec_params);
56 avctx->coded_frame = &ctx->image;
60 static int libopenjpeg_decode_frame(AVCodecContext *avctx,
61 void *data, int *data_size,
64 const uint8_t *buf = avpkt->data;
65 int buf_size = avpkt->size;
66 LibOpenJPEGContext *ctx = avctx->priv_data;
67 AVFrame *picture = &ctx->image, *output = data;
71 int width, height, has_alpha = 0, ret = -1;
78 // Check if input is a raw jpeg2k codestream or in jp2 wrapping
79 if((AV_RB32(buf) == 12) &&
80 (AV_RB32(buf + 4) == JP2_SIG_TYPE) &&
81 (AV_RB32(buf + 8) == JP2_SIG_VALUE)) {
82 dec = opj_create_decompress(CODEC_JP2);
84 // If the AVPacket contains a jp2c box, then skip to
85 // the starting byte of the codestream.
86 if (AV_RB32(buf + 4) == AV_RB32("jp2c"))
88 dec = opj_create_decompress(CODEC_J2K);
92 av_log(avctx, AV_LOG_ERROR, "Error initializing decoder.\n");
95 opj_set_event_mgr((opj_common_ptr)dec, NULL, NULL);
97 ctx->dec_params.cp_reduce = avctx->lowres;
98 // Tie decoder with decoding parameters
99 opj_setup_decoder(dec, &ctx->dec_params);
100 stream = opj_cio_open((opj_common_ptr)dec, buf, buf_size);
102 av_log(avctx, AV_LOG_ERROR, "Codestream could not be opened for reading.\n");
103 opj_destroy_decompress(dec);
107 // Decode the codestream
108 image = opj_decode_with_info(dec, stream, NULL);
109 opj_cio_close(stream);
111 av_log(avctx, AV_LOG_ERROR, "Error decoding codestream.\n");
112 opj_destroy_decompress(dec);
115 width = image->comps[0].w << avctx->lowres;
116 height = image->comps[0].h << avctx->lowres;
117 if(av_check_image_size(width, height, 0, avctx) < 0) {
118 av_log(avctx, AV_LOG_ERROR, "%dx%d dimension invalid.\n", width, height);
121 avcodec_set_dimensions(avctx, width, height);
123 switch(image->numcomps)
125 case 1: avctx->pix_fmt = PIX_FMT_GRAY8;
127 case 3: if(check_image_attributes(image)) {
128 avctx->pix_fmt = PIX_FMT_RGB24;
130 avctx->pix_fmt = PIX_FMT_GRAY8;
131 av_log(avctx, AV_LOG_ERROR, "Only first component will be used.\n");
134 case 4: has_alpha = 1;
135 avctx->pix_fmt = PIX_FMT_RGBA;
137 default: av_log(avctx, AV_LOG_ERROR, "%d components unsupported.\n", image->numcomps);
142 avctx->release_buffer(avctx, picture);
144 if(avctx->get_buffer(avctx, picture) < 0) {
145 av_log(avctx, AV_LOG_ERROR, "Couldn't allocate image buffer.\n");
149 for(x = 0; x < image->numcomps; x++) {
150 adjust[x] = FFMAX(image->comps[x].prec - 8, 0);
153 for(y = 0; y < avctx->height; y++) {
154 index = y*avctx->width;
155 img_ptr = picture->data[0] + y*picture->linesize[0];
156 for(x = 0; x < avctx->width; x++, index++) {
157 *img_ptr++ = image->comps[0].data[index] >> adjust[0];
158 if(image->numcomps > 2 && check_image_attributes(image)) {
159 *img_ptr++ = image->comps[1].data[index] >> adjust[1];
160 *img_ptr++ = image->comps[2].data[index] >> adjust[2];
162 *img_ptr++ = image->comps[3].data[index] >> adjust[3];
167 *output = ctx->image;
168 *data_size = sizeof(AVPicture);
172 opj_image_destroy(image);
173 opj_destroy_decompress(dec);
177 static av_cold int libopenjpeg_decode_close(AVCodecContext *avctx)
179 LibOpenJPEGContext *ctx = avctx->priv_data;
181 if(ctx->image.data[0])
182 avctx->release_buffer(avctx, &ctx->image);
187 AVCodec libopenjpeg_decoder = {
191 sizeof(LibOpenJPEGContext),
192 libopenjpeg_decode_init,
194 libopenjpeg_decode_close,
195 libopenjpeg_decode_frame,
198 .long_name = NULL_IF_CONFIG_SMALL("OpenJPEG based JPEG 2000 decoder"),