2 * V.Flash PTX (.ptx) image decoder
3 * Copyright (c) 2007 Ivo van Poorten
5 * This file is part of FFmpeg.
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.
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.
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
22 #include "libavutil/common.h"
23 #include "libavutil/intreadwrite.h"
24 #include "libavutil/imgutils.h"
28 static int ptx_decode_frame(AVCodecContext
*avctx
, void *data
, int *got_frame
,
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
;
37 if (buf_end
- buf
< 14)
38 return AVERROR_INVALIDDATA
;
39 offset
= AV_RL16(buf
);
42 bytes_per_pixel
= AV_RL16(buf
+12) >> 3;
44 if (bytes_per_pixel
!= 2) {
45 avpriv_request_sample(avctx
, "Image format not RGB15");
46 return AVERROR_PATCHWELCOME
;
49 avctx
->pix_fmt
= AV_PIX_FMT_BGR555LE
;
51 if (buf_end
- buf
< offset
)
52 return AVERROR_INVALIDDATA
;
54 avpriv_request_sample(avctx
, "offset != 0x2c");
58 if ((ret
= ff_set_dimensions(avctx
, w
, h
)) < 0)
61 if ((ret
= ff_get_buffer(avctx
, p
, 0)) < 0)
64 p
->pict_type
= AV_PICTURE_TYPE_I
;
67 stride
= p
->linesize
[0];
69 for (y
= 0; y
< h
&& buf_end
- buf
>= w
* bytes_per_pixel
; y
++) {
70 memcpy(ptr
, buf
, w
*bytes_per_pixel
);
72 buf
+= w
*bytes_per_pixel
;
78 av_log(avctx
, AV_LOG_WARNING
, "incomplete packet\n");
82 return offset
+ w
*h
*bytes_per_pixel
;
85 AVCodec ff_ptx_decoder
= {
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
,