4 * Copyright (c) 2009 Reimar Döffinger <Reimar.Doeffinger@gmx.de>
6 * This file is part of Libav.
8 * Libav is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
13 * Libav is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with Libav; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24 #include "bytestream.h"
27 static av_cold
int decode_init(AVCodecContext
*avctx
)
29 if (avctx
->width
& 1) {
30 av_log(avctx
, AV_LOG_ERROR
, "frwu needs even width\n");
31 return AVERROR(EINVAL
);
33 avctx
->pix_fmt
= AV_PIX_FMT_UYVY422
;
35 avctx
->coded_frame
= avcodec_alloc_frame();
36 if (!avctx
->coded_frame
)
37 return AVERROR(ENOMEM
);
42 static int decode_frame(AVCodecContext
*avctx
, void *data
, int *got_frame
,
46 AVFrame
*pic
= avctx
->coded_frame
;
47 const uint8_t *buf
= avpkt
->data
;
48 const uint8_t *buf_end
= buf
+ avpkt
->size
;
51 avctx
->release_buffer(avctx
, pic
);
53 if (avpkt
->size
< avctx
->width
* 2 * avctx
->height
+ 4 + 2*8) {
54 av_log(avctx
, AV_LOG_ERROR
, "Packet is too small.\n");
55 return AVERROR_INVALIDDATA
;
57 if (bytestream_get_le32(&buf
) != MKTAG('F', 'R', 'W', '1')) {
58 av_log(avctx
, AV_LOG_ERROR
, "incorrect marker\n");
59 return AVERROR_INVALIDDATA
;
63 if ((ret
= ff_get_buffer(avctx
, pic
)) < 0) {
64 av_log(avctx
, AV_LOG_ERROR
, "get_buffer() failed\n");
68 pic
->pict_type
= AV_PICTURE_TYPE_I
;
70 pic
->interlaced_frame
= 1;
71 pic
->top_field_first
= 1;
73 for (field
= 0; field
< 2; field
++) {
75 int field_h
= (avctx
->height
+ !field
) >> 1;
76 int field_size
, min_field_size
= avctx
->width
* 2 * field_h
;
77 uint8_t *dst
= pic
->data
[0];
78 if (buf_end
- buf
< 8)
79 return AVERROR_INVALIDDATA
;
80 buf
+= 4; // flags? 0x80 == bottom field maybe?
81 field_size
= bytestream_get_le32(&buf
);
82 if (field_size
< min_field_size
) {
83 av_log(avctx
, AV_LOG_ERROR
, "Field size %i is too small (required %i)\n", field_size
, min_field_size
);
84 return AVERROR_INVALIDDATA
;
86 if (buf_end
- buf
< field_size
) {
87 av_log(avctx
, AV_LOG_ERROR
, "Packet is too small, need %i, have %i\n", field_size
, (int)(buf_end
- buf
));
88 return AVERROR_INVALIDDATA
;
91 dst
+= pic
->linesize
[0];
92 for (i
= 0; i
< field_h
; i
++) {
93 memcpy(dst
, buf
, avctx
->width
* 2);
94 buf
+= avctx
->width
* 2;
95 dst
+= pic
->linesize
[0] << 1;
97 buf
+= field_size
- min_field_size
;
101 *(AVFrame
*)data
= *pic
;
106 static av_cold
int decode_close(AVCodecContext
*avctx
)
108 AVFrame
*pic
= avctx
->coded_frame
;
110 avctx
->release_buffer(avctx
, pic
);
111 av_freep(&avctx
->coded_frame
);
116 AVCodec ff_frwu_decoder
= {
118 .type
= AVMEDIA_TYPE_VIDEO
,
119 .id
= AV_CODEC_ID_FRWU
,
121 .close
= decode_close
,
122 .decode
= decode_frame
,
123 .capabilities
= CODEC_CAP_DR1
,
124 .long_name
= NULL_IF_CONFIG_SMALL("Forward Uncompressed"),