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
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                                    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        // If the AVPacket contains a jp2c box, then skip to
84        // the starting byte of the codestream.
85        if (AV_RB32(buf + 4) == AV_RB32("jp2c"))
86            buf += 8;
87        dec = opj_create_decompress(CODEC_J2K);
88    }
89
90    if(!dec) {
91        av_log(avctx, AV_LOG_ERROR, "Error initializing decoder.\n");
92        return -1;
93    }
94    opj_set_event_mgr((opj_common_ptr)dec, NULL, NULL);
95
96    ctx->dec_params.cp_reduce = avctx->lowres;
97    // Tie decoder with decoding parameters
98    opj_setup_decoder(dec, &ctx->dec_params);
99    stream = opj_cio_open((opj_common_ptr)dec, buf, buf_size);
100    if(!stream) {
101        av_log(avctx, AV_LOG_ERROR, "Codestream could not be opened for reading.\n");
102        opj_destroy_decompress(dec);
103        return -1;
104    }
105
106    // Decode the codestream
107    image = opj_decode_with_info(dec, stream, NULL);
108    opj_cio_close(stream);
109    if(!image) {
110        av_log(avctx, AV_LOG_ERROR, "Error decoding codestream.\n");
111        opj_destroy_decompress(dec);
112        return -1;
113    }
114    width  = image->comps[0].w << avctx->lowres;
115    height = image->comps[0].h << avctx->lowres;
116    if(avcodec_check_dimensions(avctx, width, height) < 0) {
117        av_log(avctx, AV_LOG_ERROR, "%dx%d dimension invalid.\n", width, height);
118        goto done;
119    }
120    avcodec_set_dimensions(avctx, width, height);
121
122    switch(image->numcomps)
123    {
124        case 1:  avctx->pix_fmt = PIX_FMT_GRAY8;
125                 break;
126        case 3:  if(check_image_attributes(image)) {
127                     avctx->pix_fmt = PIX_FMT_RGB24;
128                 } else {
129                     avctx->pix_fmt = PIX_FMT_GRAY8;
130                     av_log(avctx, AV_LOG_ERROR, "Only first component will be used.\n");
131                 }
132                 break;
133        case 4:  has_alpha = 1;
134                 avctx->pix_fmt = PIX_FMT_RGBA;
135                 break;
136        default: av_log(avctx, AV_LOG_ERROR, "%d components unsupported.\n", image->numcomps);
137                 goto done;
138    }
139
140    if(picture->data[0])
141        avctx->release_buffer(avctx, picture);
142
143    if(avctx->get_buffer(avctx, picture) < 0) {
144        av_log(avctx, AV_LOG_ERROR, "Couldn't allocate image buffer.\n");
145        return -1;
146    }
147
148    for(x = 0; x < image->numcomps; x++) {
149        adjust[x] = FFMAX(image->comps[x].prec - 8, 0);
150    }
151
152    for(y = 0; y < avctx->height; y++) {
153        index = y*avctx->width;
154        img_ptr = picture->data[0] + y*picture->linesize[0];
155        for(x = 0; x < avctx->width; x++, index++) {
156            *img_ptr++ = image->comps[0].data[index] >> adjust[0];
157            if(image->numcomps > 2 && check_image_attributes(image)) {
158                *img_ptr++ = image->comps[1].data[index] >> adjust[1];
159                *img_ptr++ = image->comps[2].data[index] >> adjust[2];
160                if(has_alpha)
161                    *img_ptr++ = image->comps[3].data[index] >> adjust[3];
162            }
163        }
164    }
165
166    *output    = ctx->image;
167    *data_size = sizeof(AVPicture);
168    ret = buf_size;
169
170done:
171    opj_image_destroy(image);
172    opj_destroy_decompress(dec);
173    return ret;
174}
175
176static av_cold int libopenjpeg_decode_close(AVCodecContext *avctx)
177{
178    LibOpenJPEGContext *ctx = avctx->priv_data;
179
180    if(ctx->image.data[0])
181        avctx->release_buffer(avctx, &ctx->image);
182    return 0 ;
183}
184
185
186AVCodec libopenjpeg_decoder = {
187    "libopenjpeg",
188    AVMEDIA_TYPE_VIDEO,
189    CODEC_ID_JPEG2000,
190    sizeof(LibOpenJPEGContext),
191    libopenjpeg_decode_init,
192    NULL,
193    libopenjpeg_decode_close,
194    libopenjpeg_decode_frame,
195    CODEC_CAP_DR1,
196    .long_name = NULL_IF_CONFIG_SMALL("OpenJPEG based JPEG 2000 decoder"),
197} ;
198