blob: e68fda967f1fbaf96b459b49f66bfea59a084aad
1 | /* |
2 | * Forward Uncompressed |
3 | * |
4 | * Copyright (c) 2009 Reimar Döffinger <Reimar.Doeffinger@gmx.de> |
5 | * |
6 | * This file is part of FFmpeg. |
7 | * |
8 | * FFmpeg 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. |
12 | * |
13 | * FFmpeg 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. |
17 | * |
18 | * You should have received a copy of the GNU Lesser General Public |
19 | * License along with FFmpeg; if not, write to the Free Software |
20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
21 | */ |
22 | |
23 | #include "avcodec.h" |
24 | #include "bytestream.h" |
25 | #include "internal.h" |
26 | #include "libavutil/opt.h" |
27 | |
28 | typedef struct { |
29 | AVClass *av_class; |
30 | int change_field_order; |
31 | } FRWUContext; |
32 | |
33 | static av_cold int decode_init(AVCodecContext *avctx) |
34 | { |
35 | if (avctx->width & 1) { |
36 | av_log(avctx, AV_LOG_ERROR, "frwu needs even width\n"); |
37 | return AVERROR(EINVAL); |
38 | } |
39 | avctx->pix_fmt = AV_PIX_FMT_UYVY422; |
40 | |
41 | return 0; |
42 | } |
43 | |
44 | static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, |
45 | AVPacket *avpkt) |
46 | { |
47 | FRWUContext *s = avctx->priv_data; |
48 | int field, ret; |
49 | AVFrame *pic = data; |
50 | const uint8_t *buf = avpkt->data; |
51 | const uint8_t *buf_end = buf + avpkt->size; |
52 | |
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; |
56 | } |
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; |
60 | } |
61 | |
62 | if ((ret = ff_get_buffer(avctx, pic, 0)) < 0) |
63 | return ret; |
64 | |
65 | pic->pict_type = AV_PICTURE_TYPE_I; |
66 | pic->key_frame = 1; |
67 | |
68 | for (field = 0; field < 2; field++) { |
69 | int i; |
70 | int field_h = (avctx->height + !field) >> 1; |
71 | int field_size, min_field_size = avctx->width * 2 * field_h; |
72 | uint8_t *dst = pic->data[0]; |
73 | if (buf_end - buf < 8) |
74 | return AVERROR_INVALIDDATA; |
75 | buf += 4; // flags? 0x80 == bottom field maybe? |
76 | field_size = bytestream_get_le32(&buf); |
77 | if (field_size < min_field_size) { |
78 | av_log(avctx, AV_LOG_ERROR, "Field size %i is too small (required %i)\n", field_size, min_field_size); |
79 | return AVERROR_INVALIDDATA; |
80 | } |
81 | if (buf_end - buf < field_size) { |
82 | av_log(avctx, AV_LOG_ERROR, "Packet is too small, need %i, have %i\n", field_size, (int)(buf_end - buf)); |
83 | return AVERROR_INVALIDDATA; |
84 | } |
85 | if (field ^ s->change_field_order) { |
86 | dst += pic->linesize[0]; |
87 | } else if (s->change_field_order) { |
88 | dst += 2 * pic->linesize[0]; |
89 | } |
90 | for (i = 0; i < field_h; i++) { |
91 | if (s->change_field_order && field && i == field_h - 1) |
92 | dst = pic->data[0]; |
93 | memcpy(dst, buf, avctx->width * 2); |
94 | buf += avctx->width * 2; |
95 | dst += pic->linesize[0] << 1; |
96 | } |
97 | buf += field_size - min_field_size; |
98 | } |
99 | |
100 | *got_frame = 1; |
101 | |
102 | return avpkt->size; |
103 | } |
104 | |
105 | static const AVOption frwu_options[] = { |
106 | {"change_field_order", "Change field order", offsetof(FRWUContext, change_field_order), AV_OPT_TYPE_BOOL, |
107 | {.i64 = 0}, 0, 1, AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_VIDEO_PARAM}, |
108 | {NULL} |
109 | }; |
110 | |
111 | static const AVClass frwu_class = { |
112 | .class_name = "frwu Decoder", |
113 | .item_name = av_default_item_name, |
114 | .option = frwu_options, |
115 | .version = LIBAVUTIL_VERSION_INT, |
116 | }; |
117 | |
118 | AVCodec ff_frwu_decoder = { |
119 | .name = "frwu", |
120 | .long_name = NULL_IF_CONFIG_SMALL("Forward Uncompressed"), |
121 | .type = AVMEDIA_TYPE_VIDEO, |
122 | .id = AV_CODEC_ID_FRWU, |
123 | .priv_data_size = sizeof(FRWUContext), |
124 | .init = decode_init, |
125 | .decode = decode_frame, |
126 | .capabilities = AV_CODEC_CAP_DR1, |
127 | .priv_class = &frwu_class, |
128 | }; |
129 |