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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), FF_OPT_TYPE_INT, | |
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 = CODEC_CAP_DR1, | |
127 | .priv_class = &frwu_class, | |
128 | }; |