Directory: | ../../../ffmpeg/ |
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File: | src/libavcodec/msrle.c |
Date: | 2022-07-05 19:52:29 |
Exec | Total | Coverage | |
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Lines: | 33 | 64 | 51.6% |
Branches: | 11 | 32 | 34.4% |
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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 |
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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 |
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2 | if (!s->frame) |
76 | ✗ | return AVERROR(ENOMEM); | |
77 | |||
78 |
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2 | if (avctx->extradata_size >= 4) |
79 |
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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 |
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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 | ✗ | 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 |
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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 |