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
35typedef struct {
36    opj_dparameters_t dec_params;
37    AVFrame image;
38} LibOpenJPEGContext;
39
40static 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
50static 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
59static 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
163done:
164    opj_image_destroy(image);
165    opj_destroy_decompress(dec);
166    return ret;
167}
168
169static 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
179AVCodec 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} ;
191