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/common.h"
23#include "libavutil/intreadwrite.h"
24#include "libavutil/imgutils.h"
25#include "avcodec.h"
26#include "internal.h"
27
28static int ptx_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
29                            AVPacket *avpkt) {
30    const uint8_t *buf = avpkt->data;
31    const uint8_t *buf_end = avpkt->data + avpkt->size;
32    AVFrame * const p = data;
33    unsigned int offset, w, h, y, stride, bytes_per_pixel;
34    int ret;
35    uint8_t *ptr;
36
37    if (buf_end - buf < 14)
38        return AVERROR_INVALIDDATA;
39    offset          = AV_RL16(buf);
40    w               = AV_RL16(buf+8);
41    h               = AV_RL16(buf+10);
42    bytes_per_pixel = AV_RL16(buf+12) >> 3;
43
44    if (bytes_per_pixel != 2) {
45        avpriv_request_sample(avctx, "Image format not RGB15");
46        return AVERROR_PATCHWELCOME;
47    }
48
49    avctx->pix_fmt = AV_PIX_FMT_BGR555LE;
50
51    if (buf_end - buf < offset)
52        return AVERROR_INVALIDDATA;
53    if (offset != 0x2c)
54        avpriv_request_sample(avctx, "offset != 0x2c");
55
56    buf += offset;
57
58    if ((ret = ff_set_dimensions(avctx, w, h)) < 0)
59        return ret;
60
61    if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
62        return ret;
63
64    p->pict_type = AV_PICTURE_TYPE_I;
65
66    ptr    = p->data[0];
67    stride = p->linesize[0];
68
69    for (y = 0; y < h && buf_end - buf >= w * bytes_per_pixel; y++) {
70        memcpy(ptr, buf, w*bytes_per_pixel);
71        ptr += stride;
72        buf += w*bytes_per_pixel;
73    }
74
75    *got_frame = 1;
76
77    if (y < h) {
78        av_log(avctx, AV_LOG_WARNING, "incomplete packet\n");
79        return avpkt->size;
80    }
81
82    return offset + w*h*bytes_per_pixel;
83}
84
85AVCodec ff_ptx_decoder = {
86    .name           = "ptx",
87    .long_name      = NULL_IF_CONFIG_SMALL("V.Flash PTX image"),
88    .type           = AVMEDIA_TYPE_VIDEO,
89    .id             = AV_CODEC_ID_PTX,
90    .decode         = ptx_decode_frame,
91    .capabilities   = CODEC_CAP_DR1,
92};
93