f231ea3336b783490c083e6e57c9467eeded2ccf
[libav.git] / 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 <libopenjpeg/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 const uint8_t *buf, int buf_size)
62 {
63 LibOpenJPEGContext *ctx = avctx->priv_data;
64 AVFrame *picture = &ctx->image, *output = data;
65 opj_dinfo_t *dec;
66 opj_cio_t *stream;
67 opj_image_t *image;
68 int width, height, has_alpha = 0, ret = -1;
69 int x, y, index;
70 uint8_t *img_ptr;
71 int adjust[4];
72
73 *data_size = 0;
74
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);
80 } else {
81 dec = opj_create_decompress(CODEC_J2K);
82 }
83
84 if(!dec) {
85 av_log(avctx, AV_LOG_ERROR, "Error initializing decoder.\n");
86 return -1;
87 }
88 opj_set_event_mgr((opj_common_ptr)dec, NULL, NULL);
89
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);
93 if(!stream) {
94 av_log(avctx, AV_LOG_ERROR, "Codestream could not be opened for reading.\n");
95 opj_destroy_decompress(dec);
96 return -1;
97 }
98
99 // Decode the codestream
100 image = opj_decode_with_info(dec, stream, NULL);
101 opj_cio_close(stream);
102 if(!image) {
103 av_log(avctx, AV_LOG_ERROR, "Error decoding codestream.\n");
104 opj_destroy_decompress(dec);
105 return -1;
106 }
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);
111 goto done;
112 }
113 avcodec_set_dimensions(avctx, width, height);
114
115 switch(image->numcomps)
116 {
117 case 1: avctx->pix_fmt = PIX_FMT_GRAY8;
118 break;
119 case 3: if(check_image_attributes(image)) {
120 avctx->pix_fmt = PIX_FMT_RGB24;
121 } else {
122 avctx->pix_fmt = PIX_FMT_GRAY8;
123 av_log(avctx, AV_LOG_ERROR, "Only first component will be used.\n");
124 }
125 break;
126 case 4: has_alpha = 1;
127 avctx->pix_fmt = PIX_FMT_RGB32;
128 break;
129 default: av_log(avctx, AV_LOG_ERROR, "%d components unsupported.\n", image->numcomps);
130 goto done;
131 }
132
133 if(picture->data[0])
134 avctx->release_buffer(avctx, picture);
135
136 if(avctx->get_buffer(avctx, picture) < 0) {
137 av_log(avctx, AV_LOG_ERROR, "Couldn't allocate image buffer.\n");
138 return -1;
139 }
140
141 for(x = 0; x < image->numcomps; x++) {
142 adjust[x] = FFMAX(image->comps[x].prec - 8, 0);
143 }
144
145 for(y = 0; y < height; y++) {
146 index = y*width;
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];
153 if(has_alpha)
154 *img_ptr++ = image->comps[3].data[index] >> adjust[3];
155 }
156 }
157 }
158
159 *output = ctx->image;
160 *data_size = sizeof(AVPicture);
161 ret = buf_size;
162
163 done:
164 opj_image_destroy(image);
165 opj_destroy_decompress(dec);
166 return ret;
167 }
168
169 static av_cold int libopenjpeg_decode_close(AVCodecContext *avctx)
170 {
171 LibOpenJPEGContext *ctx = avctx->priv_data;
172
173 if(ctx->image.data[0])
174 avctx->release_buffer(avctx, &ctx->image);
175 return 0 ;
176 }
177
178
179 AVCodec libopenjpeg_decoder = {
180 "libopenjpeg",
181 CODEC_TYPE_VIDEO,
182 CODEC_ID_JPEG2000,
183 sizeof(LibOpenJPEGContext),
184 libopenjpeg_decode_init,
185 NULL,
186 libopenjpeg_decode_close,
187 libopenjpeg_decode_frame,
188 NULL,
189 .long_name = NULL_IF_CONFIG_SMALL("OpenJPEG based JPEG 2000 decoder"),
190 } ;