GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/bethsoftvideo.c Lines: 58 74 78.4 %
Date: 2019-11-18 18:00:01 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
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
1
    if (bytestream2_get_bytes_left(&ctx->g) < 256*3)
59
        return AVERROR_INVALIDDATA;
60
61
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
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
76
    if (avpkt->side_data_elems > 0 &&
87
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
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

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
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
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
244168
        while(length > remaining){
125
12911
            if(code < 0x80)
126
                bytestream2_get_buffer(&vid->g, dst, remaining);
127
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
12911
            if(dst == frame_end)
133
                goto end;
134
        }
135
136
        // copy any remaining bytes after / if line overflows
137
231257
        if(code < 0x80)
138
112219
            bytestream2_get_buffer(&vid->g, dst, length);
139
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
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
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
};