e6835e6f4aa63cae49b3a23e423420340676a353
2 * V.Flash PTX (.ptx) image decoder
3 * Copyright (c) 2007 Ivo van Poorten
5 * This file is part of Libav.
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.
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.
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
22 #include "libavutil/common.h"
23 #include "libavutil/intreadwrite.h"
24 #include "libavutil/imgutils.h"
27 typedef struct PTXContext
{
31 static av_cold
int ptx_init(AVCodecContext
*avctx
) {
32 PTXContext
*s
= avctx
->priv_data
;
34 avcodec_get_frame_defaults(&s
->picture
);
35 avctx
->coded_frame
= &s
->picture
;
40 static int ptx_decode_frame(AVCodecContext
*avctx
, void *data
, int *data_size
,
42 const uint8_t *buf
= avpkt
->data
;
43 const uint8_t *buf_end
= avpkt
->data
+ avpkt
->size
;
44 PTXContext
* const s
= avctx
->priv_data
;
45 AVFrame
*picture
= data
;
46 AVFrame
* const p
= &s
->picture
;
47 unsigned int offset
, w
, h
, y
, stride
, bytes_per_pixel
;
50 if (buf_end
- buf
< 14)
51 return AVERROR_INVALIDDATA
;
52 offset
= AV_RL16(buf
);
55 bytes_per_pixel
= AV_RL16(buf
+12) >> 3;
57 if (bytes_per_pixel
!= 2) {
58 av_log_ask_for_sample(avctx
, "Image format is not RGB15.\n");
62 avctx
->pix_fmt
= AV_PIX_FMT_RGB555
;
64 if (buf_end
- buf
< offset
)
65 return AVERROR_INVALIDDATA
;
67 av_log_ask_for_sample(avctx
, "offset != 0x2c\n");
72 avctx
->release_buffer(avctx
, p
);
74 if (av_image_check_size(w
, h
, 0, avctx
))
76 if (w
!= avctx
->width
|| h
!= avctx
->height
)
77 avcodec_set_dimensions(avctx
, w
, h
);
78 if (avctx
->get_buffer(avctx
, p
) < 0) {
79 av_log(avctx
, AV_LOG_ERROR
, "get_buffer() failed\n");
83 p
->pict_type
= AV_PICTURE_TYPE_I
;
86 stride
= p
->linesize
[0];
88 for (y
= 0; y
< h
&& buf_end
- buf
>= w
* bytes_per_pixel
; y
++) {
91 for (x
=0; x
<w
*bytes_per_pixel
; x
+=bytes_per_pixel
)
92 AV_WN16(ptr
+x
, AV_RL16(buf
+x
));
94 memcpy(ptr
, buf
, w
*bytes_per_pixel
);
97 buf
+= w
*bytes_per_pixel
;
100 *picture
= s
->picture
;
101 *data_size
= sizeof(AVPicture
);
104 av_log(avctx
, AV_LOG_WARNING
, "incomplete packet\n");
108 return offset
+ w
*h
*bytes_per_pixel
;
111 static av_cold
int ptx_end(AVCodecContext
*avctx
) {
112 PTXContext
*s
= avctx
->priv_data
;
114 if(s
->picture
.data
[0])
115 avctx
->release_buffer(avctx
, &s
->picture
);
120 AVCodec ff_ptx_decoder
= {
122 .type
= AVMEDIA_TYPE_VIDEO
,
123 .id
= AV_CODEC_ID_PTX
,
124 .priv_data_size
= sizeof(PTXContext
),
127 .decode
= ptx_decode_frame
,
128 .capabilities
= CODEC_CAP_DR1
,
129 .long_name
= NULL_IF_CONFIG_SMALL("V.Flash PTX image"),