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                            AVPacket *avpkt) {
40    const uint8_t *buf = avpkt->data;
41    PTXContext * const s = avctx->priv_data;
42    AVFrame *picture = data;
43    AVFrame * const p = &s->picture;
44    unsigned int offset, w, h, y, stride, bytes_per_pixel;
45    uint8_t *ptr;
46
47    offset          = AV_RL16(buf);
48    w               = AV_RL16(buf+8);
49    h               = AV_RL16(buf+10);
50    bytes_per_pixel = AV_RL16(buf+12) >> 3;
51
52    if (bytes_per_pixel != 2) {
53        av_log(avctx, AV_LOG_ERROR, "image format is not rgb15, please report on ffmpeg-users mailing list\n");
54        return -1;
55    }
56
57    avctx->pix_fmt = PIX_FMT_RGB555;
58
59    if (offset != 0x2c)
60        av_log(avctx, AV_LOG_WARNING, "offset != 0x2c, untested due to lack of sample files\n");
61
62    buf += offset;
63
64    if (p->data[0])
65        avctx->release_buffer(avctx, p);
66
67    if (avcodec_check_dimensions(avctx, w, h))
68        return -1;
69    if (w != avctx->width || h != avctx->height)
70        avcodec_set_dimensions(avctx, w, h);
71    if (avctx->get_buffer(avctx, p) < 0) {
72        av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
73        return -1;
74    }
75
76    p->pict_type = FF_I_TYPE;
77
78    ptr    = p->data[0];
79    stride = p->linesize[0];
80
81    for (y=0; y<h; y++) {
82#if HAVE_BIGENDIAN
83        unsigned int x;
84        for (x=0; x<w*bytes_per_pixel; x+=bytes_per_pixel)
85            AV_WN16(ptr+x, AV_RL16(buf+x));
86#else
87        memcpy(ptr, buf, w*bytes_per_pixel);
88#endif
89        ptr += stride;
90        buf += w*bytes_per_pixel;
91    }
92
93    *picture = s->picture;
94    *data_size = sizeof(AVPicture);
95
96    return offset + w*h*bytes_per_pixel;
97}
98
99static av_cold int ptx_end(AVCodecContext *avctx) {
100    PTXContext *s = avctx->priv_data;
101
102    if(s->picture.data[0])
103        avctx->release_buffer(avctx, &s->picture);
104
105    return 0;
106}
107
108AVCodec ptx_decoder = {
109    "ptx",
110    AVMEDIA_TYPE_VIDEO,
111    CODEC_ID_PTX,
112    sizeof(PTXContext),
113    ptx_init,
114    NULL,
115    ptx_end,
116    ptx_decode_frame,
117    CODEC_CAP_DR1,
118    NULL,
119    .long_name = NULL_IF_CONFIG_SMALL("V.Flash PTX image"),
120};
121