GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/msrle.c Lines: 37 69 53.6 %
Date: 2019-11-18 18:00:01 Branches: 15 38 39.5 %

Line Branch Exec Source
1
/*
2
 * Microsoft RLE video decoder
3
 * Copyright (C) 2003 The FFmpeg project
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
 * MS RLE video decoder by Mike Melanson (melanson@pcisys.net)
25
 * For more information about the MS RLE format, visit:
26
 *   http://www.pcisys.net/~melanson/codecs/
27
 *
28
 * The MS RLE decoder outputs PAL8 colorspace data.
29
 */
30
31
#include <stdio.h>
32
#include <stdlib.h>
33
#include <string.h>
34
35
#include "avcodec.h"
36
#include "internal.h"
37
#include "msrledec.h"
38
#include "libavutil/imgutils.h"
39
40
typedef struct MsrleContext {
41
    AVCodecContext *avctx;
42
    AVFrame *frame;
43
44
    GetByteContext gb;
45
46
    uint32_t pal[256];
47
} MsrleContext;
48
49
2
static av_cold int msrle_decode_init(AVCodecContext *avctx)
50
{
51
2
    MsrleContext *s = avctx->priv_data;
52
    int i;
53
54
2
    s->avctx = avctx;
55
56

2
    switch (avctx->bits_per_coded_sample) {
57
    case 1:
58
        avctx->pix_fmt = AV_PIX_FMT_MONOWHITE;
59
        break;
60
2
    case 4:
61
    case 8:
62
2
        avctx->pix_fmt = AV_PIX_FMT_PAL8;
63
2
        break;
64
    case 24:
65
        avctx->pix_fmt = AV_PIX_FMT_BGR24;
66
        break;
67
    default:
68
        av_log(avctx, AV_LOG_ERROR, "unsupported bits per sample\n");
69
        return AVERROR_INVALIDDATA;
70
    }
71
72
2
    s->frame = av_frame_alloc();
73
2
    if (!s->frame)
74
        return AVERROR(ENOMEM);
75
76
2
    if (avctx->extradata_size >= 4)
77
36
        for (i = 0; i < FFMIN(avctx->extradata_size, AVPALETTE_SIZE)/4; i++)
78
34
            s->pal[i] = 0xFFU<<24 | AV_RL32(avctx->extradata+4*i);
79
80
2
    return 0;
81
}
82
83
29
static int msrle_decode_frame(AVCodecContext *avctx,
84
                              void *data, int *got_frame,
85
                              AVPacket *avpkt)
86
{
87
29
    const uint8_t *buf = avpkt->data;
88
29
    int buf_size = avpkt->size;
89
29
    MsrleContext *s = avctx->priv_data;
90
29
    int istride = FFALIGN(avctx->width*avctx->bits_per_coded_sample, 32) / 8;
91
    int ret;
92
93
29
    if (buf_size < 2) //Minimally a end of picture code should be there
94
        return AVERROR_INVALIDDATA;
95
96
29
    if ((ret = ff_reget_buffer(avctx, s->frame, 0)) < 0)
97
        return ret;
98
99

29
    if (avctx->bits_per_coded_sample > 1 && avctx->bits_per_coded_sample <= 8) {
100
        int size;
101
29
        const uint8_t *pal = av_packet_get_side_data(avpkt, AV_PKT_DATA_PALETTE, &size);
102
103

29
        if (pal && size == AVPALETTE_SIZE) {
104
1
            s->frame->palette_has_changed = 1;
105
1
            memcpy(s->pal, pal, AVPALETTE_SIZE);
106
28
        } else if (pal) {
107
            av_log(avctx, AV_LOG_ERROR, "Palette size %d is wrong\n", size);
108
        }
109
        /* make the palette available */
110
29
        memcpy(s->frame->data[1], s->pal, AVPALETTE_SIZE);
111
    }
112
113
    /* FIXME how to correctly detect RLE ??? */
114
29
    if (avctx->height * istride == avpkt->size) { /* assume uncompressed */
115
        int linesize = av_image_get_linesize(avctx->pix_fmt, avctx->width, 0);
116
        uint8_t *ptr = s->frame->data[0];
117
        uint8_t *buf = avpkt->data + (avctx->height-1)*istride;
118
        int i, j;
119
120
        if (linesize < 0)
121
            return linesize;
122
123
        for (i = 0; i < avctx->height; i++) {
124
            if (avctx->bits_per_coded_sample == 4) {
125
                for (j = 0; j < avctx->width - 1; j += 2) {
126
                    ptr[j+0] = buf[j>>1] >> 4;
127
                    ptr[j+1] = buf[j>>1] & 0xF;
128
                }
129
                if (avctx->width & 1)
130
                    ptr[j+0] = buf[j>>1] >> 4;
131
            } else {
132
                memcpy(ptr, buf, linesize);
133
            }
134
            buf -= istride;
135
            ptr += s->frame->linesize[0];
136
        }
137
    } else {
138
29
        bytestream2_init(&s->gb, buf, buf_size);
139
29
        ff_msrle_decode(avctx, s->frame, avctx->bits_per_coded_sample, &s->gb);
140
    }
141
142
29
    if ((ret = av_frame_ref(data, s->frame)) < 0)
143
        return ret;
144
145
29
    *got_frame      = 1;
146
147
    /* report that the buffer was completely consumed */
148
29
    return buf_size;
149
}
150
151
static void msrle_decode_flush(AVCodecContext *avctx)
152
{
153
    MsrleContext *s = avctx->priv_data;
154
155
    av_frame_unref(s->frame);
156
}
157
158
2
static av_cold int msrle_decode_end(AVCodecContext *avctx)
159
{
160
2
    MsrleContext *s = avctx->priv_data;
161
162
    /* release the last frame */
163
2
    av_frame_free(&s->frame);
164
165
2
    return 0;
166
}
167
168
AVCodec ff_msrle_decoder = {
169
    .name           = "msrle",
170
    .long_name      = NULL_IF_CONFIG_SMALL("Microsoft RLE"),
171
    .type           = AVMEDIA_TYPE_VIDEO,
172
    .id             = AV_CODEC_ID_MSRLE,
173
    .priv_data_size = sizeof(MsrleContext),
174
    .init           = msrle_decode_init,
175
    .close          = msrle_decode_end,
176
    .decode         = msrle_decode_frame,
177
    .flush          = msrle_decode_flush,
178
    .capabilities   = AV_CODEC_CAP_DR1,
179
};