blob: 42147f4afce6d55742d26955cd4d6b9394ccaa03
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 | |
28 | static 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 | |
85 | AVCodec 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 = AV_CODEC_CAP_DR1, |
92 | }; |
93 |