FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/bethsoftvideo.c
Date: 2021-09-16 08:47:15
Exec Total Coverage
Lines: 58 74 78.4%
Branches: 25 38 65.8%

Line Branch Exec Source
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 2 static av_cold int bethsoftvid_decode_init(AVCodecContext *avctx)
42 {
43 2 BethsoftvidContext *vid = avctx->priv_data;
44 2 avctx->pix_fmt = AV_PIX_FMT_PAL8;
45
46 2 vid->frame = av_frame_alloc();
47
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2 if (!vid->frame)
48 return AVERROR(ENOMEM);
49
50 2 return 0;
51 }
52
53 1 static int set_palette(BethsoftvidContext *ctx)
54 {
55 1 uint32_t *palette = (uint32_t *)ctx->frame->data[1];
56 int a;
57
58
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1 if (bytestream2_get_bytes_left(&ctx->g) < 256*3)
59 return AVERROR_INVALIDDATA;
60
61
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257 for(a = 0; a < 256; a++){
62 256 palette[a] = 0xFFU << 24 | bytestream2_get_be24u(&ctx->g) * 4;
63 256 palette[a] |= palette[a] >> 6 & 0x30303;
64 }
65 1 ctx->frame->palette_has_changed = 1;
66 1 return 0;
67 }
68
69 76 static int bethsoftvid_decode_frame(AVCodecContext *avctx,
70 void *data, int *got_frame,
71 AVPacket *avpkt)
72 {
73 76 BethsoftvidContext * vid = avctx->priv_data;
74 char block_type;
75 uint8_t * dst;
76 uint8_t * frame_end;
77 76 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
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76 if ((ret = ff_reget_buffer(avctx, vid->frame, 0)) < 0)
83 return ret;
84 76 wrap_to_next_line = vid->frame->linesize[0] - avctx->width;
85
86
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76 if (avpkt->side_data_elems > 0 &&
87
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1 avpkt->side_data[0].type == AV_PKT_DATA_PALETTE) {
88 1 bytestream2_init(&vid->g, avpkt->side_data[0].data,
89 1 avpkt->side_data[0].size);
90
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1 if ((ret = set_palette(vid)) < 0)
91 return ret;
92 }
93
94 76 bytestream2_init(&vid->g, avpkt->data, avpkt->size);
95 76 dst = vid->frame->data[0];
96 76 frame_end = vid->frame->data[0] + vid->frame->linesize[0] * avctx->height;
97
98
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76 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 75 case VIDEO_YOFF_P_FRAME:
108 75 yoffset = bytestream2_get_le16(&vid->g);
109
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75 if(yoffset >= avctx->height)
110 return AVERROR_INVALIDDATA;
111 75 dst += vid->frame->linesize[0] * yoffset;
112 76 case VIDEO_P_FRAME:
113 case VIDEO_I_FRAME:
114 76 break;
115 default:
116 return AVERROR_INVALIDDATA;
117 }
118
119 // main code
120
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231333 while((code = bytestream2_get_byte(&vid->g))){
121 231257 int length = code & 0x7f;
122
123 // copy any bytes starting at the current position, and ending at the frame width
124
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244168 while(length > remaining){
125
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12911 if(code < 0x80)
126 bytestream2_get_buffer(&vid->g, dst, remaining);
127
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12911 else if(block_type == VIDEO_I_FRAME)
128 199 memset(dst, bytestream2_peek_byte(&vid->g), remaining);
129 12911 length -= remaining; // decrement the number of bytes to be copied
130 12911 dst += remaining + wrap_to_next_line; // skip over extra bytes at end of frame
131 12911 remaining = avctx->width;
132
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12911 if(dst == frame_end)
133 goto end;
134 }
135
136 // copy any remaining bytes after / if line overflows
137
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231257 if(code < 0x80)
138 112219 bytestream2_get_buffer(&vid->g, dst, length);
139
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119038 else if(block_type == VIDEO_I_FRAME)
140 504 memset(dst, bytestream2_get_byte(&vid->g), length);
141 231257 remaining -= length;
142 231257 dst += length;
143 }
144 76 end:
145
146
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76 if ((ret = av_frame_ref(data, vid->frame)) < 0)
147 return ret;
148
149 76 *got_frame = 1;
150
151 76 return avpkt->size;
152 }
153
154 2 static av_cold int bethsoftvid_decode_end(AVCodecContext *avctx)
155 {
156 2 BethsoftvidContext * vid = avctx->priv_data;
157 2 av_frame_free(&vid->frame);
158 2 return 0;
159 }
160
161 const AVCodec ff_bethsoftvid_decoder = {
162 .name = "bethsoftvid",
163 .long_name = NULL_IF_CONFIG_SMALL("Bethesda VID video"),
164 .type = AVMEDIA_TYPE_VIDEO,
165 .id = AV_CODEC_ID_BETHSOFTVID,
166 .priv_data_size = sizeof(BethsoftvidContext),
167 .init = bethsoftvid_decode_init,
168 .close = bethsoftvid_decode_end,
169 .decode = bethsoftvid_decode_frame,
170 .capabilities = AV_CODEC_CAP_DR1,
171 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
172 };
173