FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/msrle.c
Date: 2022-07-05 19:52:29
Exec Total Coverage
Lines: 33 64 51.6%
Branches: 11 32 34.4%
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 "codec_internal.h"
37 #include "decode.h"
38 #include "internal.h"
39 #include "msrledec.h"
40 #include "libavutil/imgutils.h"
41
42 typedef struct MsrleContext {
43 AVCodecContext *avctx;
44 AVFrame *frame;
45
46 GetByteContext gb;
47
48 uint32_t pal[256];
49 } MsrleContext;
50
51 2 static av_cold int msrle_decode_init(AVCodecContext *avctx)
52 {
53 2 MsrleContext *s = avctx->priv_data;
54 int i;
55
56 2 s->avctx = avctx;
57
58
1/4
✗ Branch 0 not taken.
✓ Branch 1 taken 2 times.
✗ Branch 2 not taken.
✗ Branch 3 not taken.
 2 switch (avctx->bits_per_coded_sample) {
59 ✗ case 1:
60 ✗ avctx->pix_fmt = AV_PIX_FMT_MONOWHITE;
61 ✗ break;
62 2 case 4:
63 case 8:
64 2 avctx->pix_fmt = AV_PIX_FMT_PAL8;
65 2 break;
66 ✗ case 24:
67 ✗ avctx->pix_fmt = AV_PIX_FMT_BGR24;
68 ✗ break;
69 ✗ default:
70 ✗ av_log(avctx, AV_LOG_ERROR, "unsupported bits per sample\n");
71 ✗ return AVERROR_INVALIDDATA;
72 }
73
74 2 s->frame = av_frame_alloc();
75
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 2 times.
 2 if (!s->frame)
76 ✗ return AVERROR(ENOMEM);
77
78
1/2
✓ Branch 0 taken 2 times.
✗ Branch 1 not taken.
 2 if (avctx->extradata_size >= 4)
79
2/2
✓ Branch 0 taken 34 times.
✓ Branch 1 taken 2 times.
 36 for (i = 0; i < FFMIN(avctx->extradata_size, AVPALETTE_SIZE)/4; i++)
80 34 s->pal[i] = 0xFFU<<24 | AV_RL32(avctx->extradata+4*i);
81
82 2 return 0;
83 }
84
85 29 static int msrle_decode_frame(AVCodecContext *avctx, AVFrame *rframe,
86 int *got_frame, AVPacket *avpkt)
87 {
88 29 const uint8_t *buf = avpkt->data;
89 29 int buf_size = avpkt->size;
90 29 MsrleContext *s = avctx->priv_data;
91 29 int istride = FFALIGN(avctx->width*avctx->bits_per_coded_sample, 32) / 8;
92 int ret;
93
94
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 29 times.
 29 if (buf_size < 2) //Minimally a end of picture code should be there
95 ✗ return AVERROR_INVALIDDATA;
96
97
1/2
✗ Branch 1 not taken.
✓ Branch 2 taken 29 times.
 29 if ((ret = ff_reget_buffer(avctx, s->frame, 0)) < 0)
98 ✗ return ret;
99
100
2/4
✓ Branch 0 taken 29 times.
✗ Branch 1 not taken.
✓ Branch 2 taken 29 times.
✗ Branch 3 not taken.
 29 if (avctx->bits_per_coded_sample > 1 && avctx->bits_per_coded_sample <= 8) {
101 29 s->frame->palette_has_changed = ff_copy_palette(s->pal, avpkt, avctx);
102
103 /* make the palette available */
104 29 memcpy(s->frame->data[1], s->pal, AVPALETTE_SIZE);
105 }
106
107 /* FIXME how to correctly detect RLE ??? */
108
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 29 times.
 29 if (avctx->height * istride == avpkt->size) { /* assume uncompressed */
109 ✗ int linesize = av_image_get_linesize(avctx->pix_fmt, avctx->width, 0);
110 ✗ uint8_t *ptr = s->frame->data[0];
111 ✗ const uint8_t *buf = avpkt->data + (avctx->height-1)*istride;
112 int i, j;
113
114 ✗ if (linesize < 0)
115 ✗ return linesize;
116
117 ✗ for (i = 0; i < avctx->height; i++) {
118 ✗ if (avctx->bits_per_coded_sample == 4) {
119 ✗ for (j = 0; j < avctx->width - 1; j += 2) {
120 ✗ ptr[j+0] = buf[j>>1] >> 4;
121 ✗ ptr[j+1] = buf[j>>1] & 0xF;
122 }
123 ✗ if (avctx->width & 1)
124 ✗ ptr[j+0] = buf[j>>1] >> 4;
125 } else {
126 ✗ memcpy(ptr, buf, linesize);
127 }
128 ✗ buf -= istride;
129 ✗ ptr += s->frame->linesize[0];
130 }
131 } else {
132 29 bytestream2_init(&s->gb, buf, buf_size);
133 29 ff_msrle_decode(avctx, s->frame, avctx->bits_per_coded_sample, &s->gb);
134 }
135
136
1/2
✗ Branch 1 not taken.
✓ Branch 2 taken 29 times.
 29 if ((ret = av_frame_ref(rframe, s->frame)) < 0)
137 ✗ return ret;
138
139 29 *got_frame = 1;
140
141 /* report that the buffer was completely consumed */
142 29 return buf_size;
143 }
144
145 ✗ static void msrle_decode_flush(AVCodecContext *avctx)
146 {
147 ✗ MsrleContext *s = avctx->priv_data;
148
149 ✗ av_frame_unref(s->frame);
150 }
151
152 2 static av_cold int msrle_decode_end(AVCodecContext *avctx)
153 {
154 2 MsrleContext *s = avctx->priv_data;
155
156 /* release the last frame */
157 2 av_frame_free(&s->frame);
158
159 2 return 0;
160 }
161
162 const FFCodec ff_msrle_decoder = {
163 .p.name = "msrle",
164 .p.long_name = NULL_IF_CONFIG_SMALL("Microsoft RLE"),
165 .p.type = AVMEDIA_TYPE_VIDEO,
166 .p.id = AV_CODEC_ID_MSRLE,
167 .priv_data_size = sizeof(MsrleContext),
168 .init = msrle_decode_init,
169 .close = msrle_decode_end,
170 FF_CODEC_DECODE_CB(msrle_decode_frame),
171 .flush = msrle_decode_flush,
172 .p.capabilities = AV_CODEC_CAP_DR1,
173 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
174 };
175