1/*
2 * V.Flash PTX (.ptx) image decoder
3 * Copyright (c) 2007 Ivo van Poorten
4 *
5 * This file is part of Libav.
6 *
7 * Libav 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 * Libav 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 Libav; 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 "libavutil/imgutils.h"
24#include "avcodec.h"
25
26typedef struct PTXContext {
27    AVFrame picture;
28} PTXContext;
29
30static av_cold int ptx_init(AVCodecContext *avctx) {
31    PTXContext *s = avctx->priv_data;
32
33    avcodec_get_frame_defaults(&s->picture);
34    avctx->coded_frame= &s->picture;
35
36    return 0;
37}
38
39static int ptx_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
40                            AVPacket *avpkt) {
41    const uint8_t *buf = avpkt->data;
42    const uint8_t *buf_end = avpkt->data + avpkt->size;
43    PTXContext * const s = avctx->priv_data;
44    AVFrame *picture = data;
45    AVFrame * const p = &s->picture;
46    unsigned int offset, w, h, y, stride, bytes_per_pixel;
47    uint8_t *ptr;
48
49    if (buf_end - buf < 14)
50        return AVERROR_INVALIDDATA;
51    offset          = AV_RL16(buf);
52    w               = AV_RL16(buf+8);
53    h               = AV_RL16(buf+10);
54    bytes_per_pixel = AV_RL16(buf+12) >> 3;
55
56    if (bytes_per_pixel != 2) {
57        av_log_ask_for_sample(avctx, "Image format is not RGB15.\n");
58        return -1;
59    }
60
61    avctx->pix_fmt = PIX_FMT_RGB555;
62
63    if (buf_end - buf < offset)
64        return AVERROR_INVALIDDATA;
65    if (offset != 0x2c)
66        av_log_ask_for_sample(avctx, "offset != 0x2c\n");
67
68    buf += offset;
69
70    if (p->data[0])
71        avctx->release_buffer(avctx, p);
72
73    if (av_image_check_size(w, h, 0, avctx))
74        return -1;
75    if (w != avctx->width || h != avctx->height)
76        avcodec_set_dimensions(avctx, w, h);
77    if (avctx->get_buffer(avctx, p) < 0) {
78        av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
79        return -1;
80    }
81
82    p->pict_type = AV_PICTURE_TYPE_I;
83
84    ptr    = p->data[0];
85    stride = p->linesize[0];
86
87    for (y = 0; y < h && buf_end - buf >= w * bytes_per_pixel; y++) {
88#if HAVE_BIGENDIAN
89        unsigned int x;
90        for (x=0; x<w*bytes_per_pixel; x+=bytes_per_pixel)
91            AV_WN16(ptr+x, AV_RL16(buf+x));
92#else
93        memcpy(ptr, buf, w*bytes_per_pixel);
94#endif
95        ptr += stride;
96        buf += w*bytes_per_pixel;
97    }
98
99    *picture = s->picture;
100    *data_size = sizeof(AVPicture);
101
102    if (y < h) {
103        av_log(avctx, AV_LOG_WARNING, "incomplete packet\n");
104        return avpkt->size;
105    }
106
107    return offset + w*h*bytes_per_pixel;
108}
109
110static av_cold int ptx_end(AVCodecContext *avctx) {
111    PTXContext *s = avctx->priv_data;
112
113    if(s->picture.data[0])
114        avctx->release_buffer(avctx, &s->picture);
115
116    return 0;
117}
118
119AVCodec ff_ptx_decoder = {
120    .name           = "ptx",
121    .type           = AVMEDIA_TYPE_VIDEO,
122    .id             = CODEC_ID_PTX,
123    .priv_data_size = sizeof(PTXContext),
124    .init           = ptx_init,
125    .close          = ptx_end,
126    .decode         = ptx_decode_frame,
127    .capabilities   = CODEC_CAP_DR1,
128    .long_name = NULL_IF_CONFIG_SMALL("V.Flash PTX image"),
129};
130