FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/msrle.c
Date: 2025-04-29 22:51:50
Exec Total Coverage
Lines: 33 65 50.8%
Functions: 3 4 75.0%
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 <string.h>
32
33 #include "avcodec.h"
34 #include "codec_internal.h"
35 #include "decode.h"
36 #include "msrledec.h"
37 #include "libavutil/imgutils.h"
38
39 typedef struct MsrleContext {
40 AVCodecContext *avctx;
41 AVFrame *frame;
42
43 GetByteContext gb;
44
45 uint32_t pal[256];
46 } MsrleContext;
47
48 10 static av_cold int msrle_decode_init(AVCodecContext *avctx)
49 {
50 10 MsrleContext *s = avctx->priv_data;
51 int i;
52
53 10 s->avctx = avctx;
54
55
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 10 switch (avctx->bits_per_coded_sample) {
56 ✗ case 1:
57 ✗ avctx->pix_fmt = AV_PIX_FMT_MONOWHITE;
58 ✗ break;
59 10 case 4:
60 case 8:
61 10 avctx->pix_fmt = AV_PIX_FMT_PAL8;
62 10 break;
63 ✗ case 24:
64 ✗ avctx->pix_fmt = AV_PIX_FMT_BGR24;
65 ✗ break;
66 ✗ default:
67 ✗ av_log(avctx, AV_LOG_ERROR, "unsupported bits per sample\n");
68 ✗ return AVERROR_INVALIDDATA;
69 }
70
71 10 s->frame = av_frame_alloc();
72
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 10 if (!s->frame)
73 ✗ return AVERROR(ENOMEM);
74
75
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 10 if (avctx->extradata_size >= 4)
76
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 2092 for (i = 0; i < FFMIN(avctx->extradata_size, AVPALETTE_SIZE)/4; i++)
77 2082 s->pal[i] = 0xFFU<<24 | AV_RL32(avctx->extradata+4*i);
78
79 10 return 0;
80 }
81
82 229 static int msrle_decode_frame(AVCodecContext *avctx, AVFrame *rframe,
83 int *got_frame, AVPacket *avpkt)
84 {
85 229 const uint8_t *buf = avpkt->data;
86 229 int buf_size = avpkt->size;
87 229 MsrleContext *s = avctx->priv_data;
88 229 int istride = FFALIGN(avctx->width*avctx->bits_per_coded_sample, 32) / 8;
89 int ret;
90
91
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 229 if (buf_size < 2) //Minimally a end of picture code should be there
92 ✗ return AVERROR_INVALIDDATA;
93
94
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 229 if ((ret = ff_reget_buffer(avctx, s->frame, 0)) < 0)
95 ✗ return ret;
96
97
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 229 if (avctx->bits_per_coded_sample > 1 && avctx->bits_per_coded_sample <= 8) {
98 229 ff_copy_palette(s->pal, avpkt, avctx);
99 /* make the palette available */
100 229 memcpy(s->frame->data[1], s->pal, AVPALETTE_SIZE);
101 }
102
103 /* FIXME how to correctly detect RLE ??? */
104
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 229 if (avctx->height * istride == avpkt->size) { /* assume uncompressed */
105 ✗ int linesize = av_image_get_linesize(avctx->pix_fmt, avctx->width, 0);
106 ✗ uint8_t *ptr = s->frame->data[0];
107 ✗ const uint8_t *buf = avpkt->data + (avctx->height-1)*istride;
108 int i, j;
109
110 ✗ if (linesize < 0)
111 ✗ return linesize;
112
113 ✗ for (i = 0; i < avctx->height; i++) {
114 ✗ if (avctx->bits_per_coded_sample == 4) {
115 ✗ for (j = 0; j < avctx->width - 1; j += 2) {
116 ✗ ptr[j+0] = buf[j>>1] >> 4;
117 ✗ ptr[j+1] = buf[j>>1] & 0xF;
118 }
119 ✗ if (avctx->width & 1)
120 ✗ ptr[j+0] = buf[j>>1] >> 4;
121 } else {
122 ✗ memcpy(ptr, buf, linesize);
123 }
124 ✗ buf -= istride;
125 ✗ ptr += s->frame->linesize[0];
126 }
127 } else {
128 229 bytestream2_init(&s->gb, buf, buf_size);
129 229 ff_msrle_decode(avctx, s->frame, avctx->bits_per_coded_sample, &s->gb);
130 }
131
132
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 229 if ((ret = av_frame_ref(rframe, s->frame)) < 0)
133 ✗ return ret;
134
135 229 *got_frame = 1;
136
137 /* report that the buffer was completely consumed */
138 229 return buf_size;
139 }
140
141 ✗ static void msrle_decode_flush(AVCodecContext *avctx)
142 {
143 ✗ MsrleContext *s = avctx->priv_data;
144
145 ✗ av_frame_unref(s->frame);
146 ✗ }
147
148 10 static av_cold int msrle_decode_end(AVCodecContext *avctx)
149 {
150 10 MsrleContext *s = avctx->priv_data;
151
152 /* release the last frame */
153 10 av_frame_free(&s->frame);
154
155 10 return 0;
156 }
157
158 const FFCodec ff_msrle_decoder = {
159 .p.name = "msrle",
160 CODEC_LONG_NAME("Microsoft RLE"),
161 .p.type = AVMEDIA_TYPE_VIDEO,
162 .p.id = AV_CODEC_ID_MSRLE,
163 .priv_data_size = sizeof(MsrleContext),
164 .init = msrle_decode_init,
165 .close = msrle_decode_end,
166 FF_CODEC_DECODE_CB(msrle_decode_frame),
167 .flush = msrle_decode_flush,
168 .p.capabilities = AV_CODEC_CAP_DR1,
169 };
170