FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/msrle.c
Date: 2022-11-28 23:49:43
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 <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 2 static av_cold int msrle_decode_init(AVCodecContext *avctx)
49 {
50 2 MsrleContext *s = avctx->priv_data;
51 int i;
52
53 2 s->avctx = avctx;
54
55
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2 switch (avctx->bits_per_coded_sample) {
56 case 1:
57 avctx->pix_fmt = AV_PIX_FMT_MONOWHITE;
58 break;
59 2 case 4:
60 case 8:
61 2 avctx->pix_fmt = AV_PIX_FMT_PAL8;
62 2 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 2 s->frame = av_frame_alloc();
72
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2 if (!s->frame)
73 return AVERROR(ENOMEM);
74
75
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2 if (avctx->extradata_size >= 4)
76
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36 for (i = 0; i < FFMIN(avctx->extradata_size, AVPALETTE_SIZE)/4; i++)
77 34 s->pal[i] = 0xFFU<<24 | AV_RL32(avctx->extradata+4*i);
78
79 2 return 0;
80 }
81
82 29 static int msrle_decode_frame(AVCodecContext *avctx, AVFrame *rframe,
83 int *got_frame, AVPacket *avpkt)
84 {
85 29 const uint8_t *buf = avpkt->data;
86 29 int buf_size = avpkt->size;
87 29 MsrleContext *s = avctx->priv_data;
88 29 int istride = FFALIGN(avctx->width*avctx->bits_per_coded_sample, 32) / 8;
89 int ret;
90
91
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29 if (buf_size < 2) //Minimally a end of picture code should be there
92 return AVERROR_INVALIDDATA;
93
94
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29 if ((ret = ff_reget_buffer(avctx, s->frame, 0)) < 0)
95 return ret;
96
97
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29 if (avctx->bits_per_coded_sample > 1 && avctx->bits_per_coded_sample <= 8) {
98 29 s->frame->palette_has_changed = ff_copy_palette(s->pal, avpkt, avctx);
99
100 /* make the palette available */
101 29 memcpy(s->frame->data[1], s->pal, AVPALETTE_SIZE);
102 }
103
104 /* FIXME how to correctly detect RLE ??? */
105
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29 if (avctx->height * istride == avpkt->size) { /* assume uncompressed */
106 int linesize = av_image_get_linesize(avctx->pix_fmt, avctx->width, 0);
107 uint8_t *ptr = s->frame->data[0];
108 const uint8_t *buf = avpkt->data + (avctx->height-1)*istride;
109 int i, j;
110
111 if (linesize < 0)
112 return linesize;
113
114 for (i = 0; i < avctx->height; i++) {
115 if (avctx->bits_per_coded_sample == 4) {
116 for (j = 0; j < avctx->width - 1; j += 2) {
117 ptr[j+0] = buf[j>>1] >> 4;
118 ptr[j+1] = buf[j>>1] & 0xF;
119 }
120 if (avctx->width & 1)
121 ptr[j+0] = buf[j>>1] >> 4;
122 } else {
123 memcpy(ptr, buf, linesize);
124 }
125 buf -= istride;
126 ptr += s->frame->linesize[0];
127 }
128 } else {
129 29 bytestream2_init(&s->gb, buf, buf_size);
130 29 ff_msrle_decode(avctx, s->frame, avctx->bits_per_coded_sample, &s->gb);
131 }
132
133
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29 if ((ret = av_frame_ref(rframe, s->frame)) < 0)
134 return ret;
135
136 29 *got_frame = 1;
137
138 /* report that the buffer was completely consumed */
139 29 return buf_size;
140 }
141
142 static void msrle_decode_flush(AVCodecContext *avctx)
143 {
144 MsrleContext *s = avctx->priv_data;
145
146 av_frame_unref(s->frame);
147 }
148
149 2 static av_cold int msrle_decode_end(AVCodecContext *avctx)
150 {
151 2 MsrleContext *s = avctx->priv_data;
152
153 /* release the last frame */
154 2 av_frame_free(&s->frame);
155
156 2 return 0;
157 }
158
159 const FFCodec ff_msrle_decoder = {
160 .p.name = "msrle",
161 CODEC_LONG_NAME("Microsoft RLE"),
162 .p.type = AVMEDIA_TYPE_VIDEO,
163 .p.id = AV_CODEC_ID_MSRLE,
164 .priv_data_size = sizeof(MsrleContext),
165 .init = msrle_decode_init,
166 .close = msrle_decode_end,
167 FF_CODEC_DECODE_CB(msrle_decode_frame),
168 .flush = msrle_decode_flush,
169 .p.capabilities = AV_CODEC_CAP_DR1,
170 };
171