1/*
2 * V.Flash PTX (.ptx) image decoder
3 * Copyright (c) 2007 Ivo van Poorten
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#include "libavutil/intreadwrite.h"
23#include "avcodec.h"
24
25typedef struct PTXContext {
26    AVFrame picture;
27} PTXContext;
28
29static av_cold int ptx_init(AVCodecContext *avctx) {
30    PTXContext *s = avctx->priv_data;
31
32    avcodec_get_frame_defaults(&s->picture);
33    avctx->coded_frame= &s->picture;
34
35    return 0;
36}
37
38static int ptx_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
39                            const uint8_t *buf, int buf_size) {
40    PTXContext * const s = avctx->priv_data;
41    AVFrame *picture = data;
42    AVFrame * const p = &s->picture;
43    unsigned int offset, w, h, y, stride, bytes_per_pixel;
44    uint8_t *ptr;
45
46    offset          = AV_RL16(buf);
47    w               = AV_RL16(buf+8);
48    h               = AV_RL16(buf+10);
49    bytes_per_pixel = AV_RL16(buf+12) >> 3;
50
51    if (bytes_per_pixel != 2) {
52        av_log(avctx, AV_LOG_ERROR, "image format is not rgb15, please report on ffmpeg-users mailing list\n");
53        return -1;
54    }
55
56    avctx->pix_fmt = PIX_FMT_RGB555;
57
58    if (offset != 0x2c)
59        av_log(avctx, AV_LOG_WARNING, "offset != 0x2c, untested due to lack of sample files\n");
60
61    buf += offset;
62
63    if (p->data[0])
64        avctx->release_buffer(avctx, p);
65
66    if (avcodec_check_dimensions(avctx, w, h))
67        return -1;
68    if (w != avctx->width || h != avctx->height)
69        avcodec_set_dimensions(avctx, w, h);
70    if (avctx->get_buffer(avctx, p) < 0) {
71        av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
72        return -1;
73    }
74
75    p->pict_type = FF_I_TYPE;
76
77    ptr    = p->data[0];
78    stride = p->linesize[0];
79
80    for (y=0; y<h; y++) {
81#ifdef WORDS_BIGENDIAN
82        unsigned int x;
83        for (x=0; x<w*bytes_per_pixel; x+=bytes_per_pixel)
84            AV_WN16(ptr+x, AV_RL16(buf+x));
85#else
86        memcpy(ptr, buf, w*bytes_per_pixel);
87#endif
88        ptr += stride;
89        buf += w*bytes_per_pixel;
90    }
91
92    *picture = s->picture;
93    *data_size = sizeof(AVPicture);
94
95    return offset + w*h*bytes_per_pixel;
96}
97
98static av_cold int ptx_end(AVCodecContext *avctx) {
99    PTXContext *s = avctx->priv_data;
100
101    if(s->picture.data[0])
102        avctx->release_buffer(avctx, &s->picture);
103
104    return 0;
105}
106
107AVCodec ptx_decoder = {
108    "ptx",
109    CODEC_TYPE_VIDEO,
110    CODEC_ID_PTX,
111    sizeof(PTXContext),
112    ptx_init,
113    NULL,
114    ptx_end,
115    ptx_decode_frame,
116    0,
117    NULL,
118    .long_name = NULL_IF_CONFIG_SMALL("V.Flash PTX image"),
119};
120