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1 | /* |
2 | * Bethesda VID video decoder | |
3 | * Copyright (C) 2007 Nicholas Tung | |
4 | * | |
5 | * This file is part of FFmpeg. | |
6 | * | |
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. | |
11 | * | |
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. | |
16 | * | |
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 | |
20 | */ | |
21 | ||
22 | /** | |
23 | * @file | |
24 | * @brief Bethesda Softworks VID Video Decoder | |
25 | * @author Nicholas Tung [ntung (at. ntung com] (2007-03) | |
26 | * @see http://wiki.multimedia.cx/index.php?title=Bethsoft_VID | |
27 | * @see http://www.svatopluk.com/andux/docs/dfvid.html | |
28 | */ | |
29 | ||
30 | #include "libavutil/common.h" | |
31 | #include "avcodec.h" | |
32 | #include "bethsoftvideo.h" | |
33 | #include "bytestream.h" | |
34 | #include "internal.h" | |
35 | ||
36 | typedef struct BethsoftvidContext { | |
37 | AVFrame *frame; | |
38 | GetByteContext g; | |
39 | } BethsoftvidContext; | |
40 | ||
41 | static av_cold int bethsoftvid_decode_init(AVCodecContext *avctx) | |
42 | { | |
43 | BethsoftvidContext *vid = avctx->priv_data; | |
44 | avctx->pix_fmt = AV_PIX_FMT_PAL8; | |
45 | ||
46 | vid->frame = av_frame_alloc(); | |
47 | if (!vid->frame) | |
48 | return AVERROR(ENOMEM); | |
49 | ||
50 | return 0; | |
51 | } | |
52 | ||
53 | static int set_palette(BethsoftvidContext *ctx) | |
54 | { | |
55 | uint32_t *palette = (uint32_t *)ctx->frame->data[1]; | |
56 | int a; | |
57 | ||
58 | if (bytestream2_get_bytes_left(&ctx->g) < 256*3) | |
59 | return AVERROR_INVALIDDATA; | |
60 | ||
61 | for(a = 0; a < 256; a++){ | |
62 | palette[a] = 0xFFU << 24 | bytestream2_get_be24u(&ctx->g) * 4; | |
63 | palette[a] |= palette[a] >> 6 & 0x30303; | |
64 | } | |
65 | ctx->frame->palette_has_changed = 1; | |
66 | return 0; | |
67 | } | |
68 | ||
69 | static int bethsoftvid_decode_frame(AVCodecContext *avctx, | |
70 | void *data, int *got_frame, | |
71 | AVPacket *avpkt) | |
72 | { | |
73 | BethsoftvidContext * vid = avctx->priv_data; | |
74 | char block_type; | |
75 | uint8_t * dst; | |
76 | uint8_t * frame_end; | |
77 | int remaining = avctx->width; // number of bytes remaining on a line | |
78 | int wrap_to_next_line; | |
79 | int code, ret; | |
80 | int yoffset; | |
81 | ||
82 | if ((ret = ff_reget_buffer(avctx, vid->frame)) < 0) | |
83 | return ret; | |
84 | wrap_to_next_line = vid->frame->linesize[0] - avctx->width; | |
85 | ||
86 | if (avpkt->side_data_elems > 0 && | |
87 | avpkt->side_data[0].type == AV_PKT_DATA_PALETTE) { | |
88 | bytestream2_init(&vid->g, avpkt->side_data[0].data, | |
89 | avpkt->side_data[0].size); | |
90 | if ((ret = set_palette(vid)) < 0) | |
91 | return ret; | |
92 | } | |
93 | ||
94 | bytestream2_init(&vid->g, avpkt->data, avpkt->size); | |
95 | dst = vid->frame->data[0]; | |
96 | frame_end = vid->frame->data[0] + vid->frame->linesize[0] * avctx->height; | |
97 | ||
98 | switch(block_type = bytestream2_get_byte(&vid->g)){ | |
99 | case PALETTE_BLOCK: { | |
100 | *got_frame = 0; | |
101 | if ((ret = set_palette(vid)) < 0) { | |
102 | av_log(avctx, AV_LOG_ERROR, "error reading palette\n"); | |
103 | return ret; | |
104 | } | |
105 | return bytestream2_tell(&vid->g); | |
106 | } | |
107 | case VIDEO_YOFF_P_FRAME: | |
108 | yoffset = bytestream2_get_le16(&vid->g); | |
109 | if(yoffset >= avctx->height) | |
110 | return AVERROR_INVALIDDATA; | |
111 | dst += vid->frame->linesize[0] * yoffset; | |
112 | } | |
113 | ||
114 | // main code | |
115 | while((code = bytestream2_get_byte(&vid->g))){ | |
116 | int length = code & 0x7f; | |
117 | ||
118 | // copy any bytes starting at the current position, and ending at the frame width | |
119 | while(length > remaining){ | |
120 | if(code < 0x80) | |
121 | bytestream2_get_buffer(&vid->g, dst, remaining); | |
122 | else if(block_type == VIDEO_I_FRAME) | |
123 | memset(dst, bytestream2_peek_byte(&vid->g), remaining); | |
124 | length -= remaining; // decrement the number of bytes to be copied | |
125 | dst += remaining + wrap_to_next_line; // skip over extra bytes at end of frame | |
126 | remaining = avctx->width; | |
127 | if(dst == frame_end) | |
128 | goto end; | |
129 | } | |
130 | ||
131 | // copy any remaining bytes after / if line overflows | |
132 | if(code < 0x80) | |
133 | bytestream2_get_buffer(&vid->g, dst, length); | |
134 | else if(block_type == VIDEO_I_FRAME) | |
135 | memset(dst, bytestream2_get_byte(&vid->g), length); | |
136 | remaining -= length; | |
137 | dst += length; | |
138 | } | |
139 | end: | |
140 | ||
141 | if ((ret = av_frame_ref(data, vid->frame)) < 0) | |
142 | return ret; | |
143 | ||
144 | *got_frame = 1; | |
145 | ||
146 | return avpkt->size; | |
147 | } | |
148 | ||
149 | static av_cold int bethsoftvid_decode_end(AVCodecContext *avctx) | |
150 | { | |
151 | BethsoftvidContext * vid = avctx->priv_data; | |
152 | av_frame_free(&vid->frame); | |
153 | return 0; | |
154 | } | |
155 | ||
156 | AVCodec ff_bethsoftvid_decoder = { | |
157 | .name = "bethsoftvid", | |
158 | .long_name = NULL_IF_CONFIG_SMALL("Bethesda VID video"), | |
159 | .type = AVMEDIA_TYPE_VIDEO, | |
160 | .id = AV_CODEC_ID_BETHSOFTVID, | |
161 | .priv_data_size = sizeof(BethsoftvidContext), | |
162 | .init = bethsoftvid_decode_init, | |
163 | .close = bethsoftvid_decode_end, | |
164 | .decode = bethsoftvid_decode_frame, | |
165 | .capabilities = CODEC_CAP_DR1, | |
166 | }; |