FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/msrle.c
Date: 2021-09-23 20:34:37
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 "decode.h"
37 #include "internal.h"
38 #include "msrledec.h"
39 #include "libavutil/imgutils.h"
40
41 typedef struct MsrleContext {
42 AVCodecContext *avctx;
43 AVFrame *frame;
44
45 GetByteContext gb;
46
47 uint32_t pal[256];
48 } MsrleContext;
49
50 2 static av_cold int msrle_decode_init(AVCodecContext *avctx)
51 {
52 2 MsrleContext *s = avctx->priv_data;
53 int i;
54
55 2 s->avctx = avctx;
56
57
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2 switch (avctx->bits_per_coded_sample) {
58 case 1:
59 avctx->pix_fmt = AV_PIX_FMT_MONOWHITE;
60 break;
61 2 case 4:
62 case 8:
63 2 avctx->pix_fmt = AV_PIX_FMT_PAL8;
64 2 break;
65 case 24:
66 avctx->pix_fmt = AV_PIX_FMT_BGR24;
67 break;
68 default:
69 av_log(avctx, AV_LOG_ERROR, "unsupported bits per sample\n");
70 return AVERROR_INVALIDDATA;
71 }
72
73 2 s->frame = av_frame_alloc();
74
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2 if (!s->frame)
75 return AVERROR(ENOMEM);
76
77
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2 if (avctx->extradata_size >= 4)
78
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36 for (i = 0; i < FFMIN(avctx->extradata_size, AVPALETTE_SIZE)/4; i++)
79 34 s->pal[i] = 0xFFU<<24 | AV_RL32(avctx->extradata+4*i);
80
81 2 return 0;
82 }
83
84 29 static int msrle_decode_frame(AVCodecContext *avctx,
85 void *data, int *got_frame,
86 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
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29 if (buf_size < 2) //Minimally a end of picture code should be there
95 return AVERROR_INVALIDDATA;
96
97
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29 if ((ret = ff_reget_buffer(avctx, s->frame, 0)) < 0)
98 return ret;
99
100
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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
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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 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
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29 if ((ret = av_frame_ref(data, 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 AVCodec ff_msrle_decoder = {
163 .name = "msrle",
164 .long_name = NULL_IF_CONFIG_SMALL("Microsoft RLE"),
165 .type = AVMEDIA_TYPE_VIDEO,
166 .id = AV_CODEC_ID_MSRLE,
167 .priv_data_size = sizeof(MsrleContext),
168 .init = msrle_decode_init,
169 .close = msrle_decode_end,
170 .decode = msrle_decode_frame,
171 .flush = msrle_decode_flush,
172 .capabilities = AV_CODEC_CAP_DR1,
173 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
174 };
175