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 "codec_internal.h"
27 #include "internal.h"
28
ptx_decode_frame(AVCodecContext *avctx, AVFrame *p, int *got_frame, AVPacket *avpkt)29 static int ptx_decode_frame(AVCodecContext *avctx, AVFrame *p,
30 int *got_frame, AVPacket *avpkt)
31 {
32 const uint8_t *buf = avpkt->data;
33 const uint8_t *buf_end = avpkt->data + avpkt->size;
34 unsigned int offset, w, h, y, stride, bytes_per_pixel;
35 int ret;
36 uint8_t *ptr;
37
38 if (buf_end - buf < 14)
39 return AVERROR_INVALIDDATA;
40 offset = AV_RL16(buf);
41 w = AV_RL16(buf+8);
42 h = AV_RL16(buf+10);
43 bytes_per_pixel = AV_RL16(buf+12) >> 3;
44
45 if (bytes_per_pixel != 2) {
46 avpriv_request_sample(avctx, "Image format not RGB15");
47 return AVERROR_PATCHWELCOME;
48 }
49
50 avctx->pix_fmt = AV_PIX_FMT_BGR555LE;
51
52 if (buf_end - buf < offset)
53 return AVERROR_INVALIDDATA;
54 if (offset != 0x2c)
55 avpriv_request_sample(avctx, "offset != 0x2c");
56
57 buf += offset;
58
59 if (buf_end - buf < w * bytes_per_pixel)
60 return AVERROR_INVALIDDATA;
61
62 if ((ret = ff_set_dimensions(avctx, w, h)) < 0)
63 return ret;
64
65 if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
66 return ret;
67
68 p->pict_type = AV_PICTURE_TYPE_I;
69
70 ptr = p->data[0];
71 stride = p->linesize[0];
72
73 for (y = 0; y < h && buf_end - buf >= w * bytes_per_pixel; y++) {
74 memcpy(ptr, buf, w*bytes_per_pixel);
75 ptr += stride;
76 buf += w*bytes_per_pixel;
77 }
78
79 *got_frame = 1;
80
81 if (y < h) {
82 av_log(avctx, AV_LOG_WARNING, "incomplete packet\n");
83 return avpkt->size;
84 }
85
86 return offset + w*h*bytes_per_pixel;
87 }
88
89 const FFCodec ff_ptx_decoder = {
90 .p.name = "ptx",
91 .p.long_name = NULL_IF_CONFIG_SMALL("V.Flash PTX image"),
92 .p.type = AVMEDIA_TYPE_VIDEO,
93 .p.id = AV_CODEC_ID_PTX,
94 .p.capabilities = AV_CODEC_CAP_DR1,
95 FF_CODEC_DECODE_CB(ptx_decode_frame),
96 };
97