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
23 * @file libavcodec/libopenjpeg.c
24 * JPEG 2000 decoder using libopenjpeg
28 #include "libavutil/intreadwrite.h"
32 #define JP2_SIG_TYPE 0x6A502020
33 #define JP2_SIG_VALUE 0x0D0A870A
36 opj_dparameters_t dec_params
;
40 static int check_image_attributes(opj_image_t
*image
)
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
);
50 static av_cold
int libopenjpeg_decode_init(AVCodecContext
*avctx
)
52 LibOpenJPEGContext
*ctx
= avctx
->priv_data
;
54 opj_set_default_decoder_parameters(&ctx
->dec_params
);
55 avctx
->coded_frame
= &ctx
->image
;
59 static int libopenjpeg_decode_frame(AVCodecContext
*avctx
,
60 void *data
, int *data_size
,
61 const uint8_t *buf
, int buf_size
)
63 LibOpenJPEGContext
*ctx
= avctx
->priv_data
;
64 AVFrame
*picture
= &ctx
->image
, *output
= data
;
68 int width
, height
, has_alpha
= 0, ret
= -1;
75 // Check if input is a raw jpeg2k codestream or in jp2 wrapping
76 if((AV_RB32(buf
) == 12) &&
77 (AV_RB32(buf
+ 4) == JP2_SIG_TYPE
) &&
78 (AV_RB32(buf
+ 8) == JP2_SIG_VALUE
)) {
79 dec
= opj_create_decompress(CODEC_JP2
);
81 dec
= opj_create_decompress(CODEC_J2K
);
85 av_log(avctx
, AV_LOG_ERROR
, "Error initializing decoder.\n");
88 opj_set_event_mgr((opj_common_ptr
)dec
, NULL
, NULL
);
90 // Tie decoder with decoding parameters
91 opj_setup_decoder(dec
, &ctx
->dec_params
);
92 stream
= opj_cio_open((opj_common_ptr
)dec
, buf
, buf_size
);
94 av_log(avctx
, AV_LOG_ERROR
, "Codestream could not be opened for reading.\n");
95 opj_destroy_decompress(dec
);
99 // Decode the codestream
100 image
= opj_decode_with_info(dec
, stream
, NULL
);
101 opj_cio_close(stream
);
103 av_log(avctx
, AV_LOG_ERROR
, "Error decoding codestream.\n");
104 opj_destroy_decompress(dec
);
107 width
= image
->comps
[0].w
;
108 height
= image
->comps
[0].h
;
109 if(avcodec_check_dimensions(avctx
, width
, height
) < 0) {
110 av_log(avctx
, AV_LOG_ERROR
, "%dx%d dimension invalid.\n", width
, height
);
113 avcodec_set_dimensions(avctx
, width
, height
);
115 switch(image
->numcomps
)
117 case 1: avctx
->pix_fmt
= PIX_FMT_GRAY8
;
119 case 3: if(check_image_attributes(image
)) {
120 avctx
->pix_fmt
= PIX_FMT_RGB24
;
122 avctx
->pix_fmt
= PIX_FMT_GRAY8
;
123 av_log(avctx
, AV_LOG_ERROR
, "Only first component will be used.\n");
126 case 4: has_alpha
= 1;
127 avctx
->pix_fmt
= PIX_FMT_RGB32
;
129 default: av_log(avctx
, AV_LOG_ERROR
, "%d components unsupported.\n", image
->numcomps
);
134 avctx
->release_buffer(avctx
, picture
);
136 if(avctx
->get_buffer(avctx
, picture
) < 0) {
137 av_log(avctx
, AV_LOG_ERROR
, "Couldn't allocate image buffer.\n");
141 for(x
= 0; x
< image
->numcomps
; x
++) {
142 adjust
[x
] = FFMAX(image
->comps
[x
].prec
- 8, 0);
145 for(y
= 0; y
< height
; y
++) {
147 img_ptr
= picture
->data
[0] + y
*picture
->linesize
[0];
148 for(x
= 0; x
< width
; x
++, index
++) {
149 *img_ptr
++ = image
->comps
[0].data
[index
] >> adjust
[0];
150 if(image
->numcomps
> 2 && check_image_attributes(image
)) {
151 *img_ptr
++ = image
->comps
[1].data
[index
] >> adjust
[1];
152 *img_ptr
++ = image
->comps
[2].data
[index
] >> adjust
[2];
154 *img_ptr
++ = image
->comps
[3].data
[index
] >> adjust
[3];
159 *output
= ctx
->image
;
160 *data_size
= sizeof(AVPicture
);
164 opj_image_destroy(image
);
165 opj_destroy_decompress(dec
);
169 static av_cold
int libopenjpeg_decode_close(AVCodecContext
*avctx
)
171 LibOpenJPEGContext
*ctx
= avctx
->priv_data
;
173 if(ctx
->image
.data
[0])
174 avctx
->release_buffer(avctx
, &ctx
->image
);
179 AVCodec libopenjpeg_decoder
= {
183 sizeof(LibOpenJPEGContext
),
184 libopenjpeg_decode_init
,
186 libopenjpeg_decode_close
,
187 libopenjpeg_decode_frame
,
189 .long_name
= NULL_IF_CONFIG_SMALL("OpenJPEG based JPEG 2000 decoder"),