blob: adb55b1302c0762de53852731946068ff15ea7f9
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 "internal.h" |
37 | #include "msrledec.h" |
38 | #include "libavutil/imgutils.h" |
39 | |
40 | typedef struct MsrleContext { |
41 | AVCodecContext *avctx; |
42 | AVFrame *frame; |
43 | |
44 | GetByteContext gb; |
45 | const unsigned char *buf; |
46 | int size; |
47 | |
48 | uint32_t pal[256]; |
49 | } MsrleContext; |
50 | |
51 | static av_cold int msrle_decode_init(AVCodecContext *avctx) |
52 | { |
53 | MsrleContext *s = avctx->priv_data; |
54 | int i; |
55 | |
56 | s->avctx = avctx; |
57 | |
58 | switch (avctx->bits_per_coded_sample) { |
59 | case 1: |
60 | avctx->pix_fmt = AV_PIX_FMT_MONOWHITE; |
61 | break; |
62 | case 4: |
63 | case 8: |
64 | avctx->pix_fmt = AV_PIX_FMT_PAL8; |
65 | 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 | s->frame = av_frame_alloc(); |
75 | if (!s->frame) |
76 | return AVERROR(ENOMEM); |
77 | |
78 | if (avctx->extradata_size >= 4) |
79 | for (i = 0; i < FFMIN(avctx->extradata_size, AVPALETTE_SIZE)/4; i++) |
80 | s->pal[i] = 0xFFU<<24 | AV_RL32(avctx->extradata+4*i); |
81 | |
82 | return 0; |
83 | } |
84 | |
85 | static int msrle_decode_frame(AVCodecContext *avctx, |
86 | void *data, int *got_frame, |
87 | AVPacket *avpkt) |
88 | { |
89 | const uint8_t *buf = avpkt->data; |
90 | int buf_size = avpkt->size; |
91 | MsrleContext *s = avctx->priv_data; |
92 | int istride = FFALIGN(avctx->width*avctx->bits_per_coded_sample, 32) / 8; |
93 | int ret; |
94 | |
95 | s->buf = buf; |
96 | s->size = buf_size; |
97 | |
98 | if ((ret = ff_reget_buffer(avctx, s->frame)) < 0) |
99 | return ret; |
100 | |
101 | if (avctx->bits_per_coded_sample > 1 && avctx->bits_per_coded_sample <= 8) { |
102 | int size; |
103 | const uint8_t *pal = av_packet_get_side_data(avpkt, AV_PKT_DATA_PALETTE, &size); |
104 | |
105 | if (pal && size == AVPALETTE_SIZE) { |
106 | s->frame->palette_has_changed = 1; |
107 | memcpy(s->pal, pal, AVPALETTE_SIZE); |
108 | } else if (pal) { |
109 | av_log(avctx, AV_LOG_ERROR, "Palette size %d is wrong\n", size); |
110 | } |
111 | /* make the palette available */ |
112 | memcpy(s->frame->data[1], s->pal, AVPALETTE_SIZE); |
113 | } |
114 | |
115 | /* FIXME how to correctly detect RLE ??? */ |
116 | if (avctx->height * istride == avpkt->size) { /* assume uncompressed */ |
117 | int linesize = av_image_get_linesize(avctx->pix_fmt, avctx->width, 0); |
118 | uint8_t *ptr = s->frame->data[0]; |
119 | uint8_t *buf = avpkt->data + (avctx->height-1)*istride; |
120 | int i, j; |
121 | |
122 | if (linesize < 0) |
123 | return linesize; |
124 | |
125 | for (i = 0; i < avctx->height; i++) { |
126 | if (avctx->bits_per_coded_sample == 4) { |
127 | for (j = 0; j < avctx->width - 1; j += 2) { |
128 | ptr[j+0] = buf[j>>1] >> 4; |
129 | ptr[j+1] = buf[j>>1] & 0xF; |
130 | } |
131 | if (avctx->width & 1) |
132 | ptr[j+0] = buf[j>>1] >> 4; |
133 | } else { |
134 | memcpy(ptr, buf, linesize); |
135 | } |
136 | buf -= istride; |
137 | ptr += s->frame->linesize[0]; |
138 | } |
139 | } else { |
140 | bytestream2_init(&s->gb, buf, buf_size); |
141 | ff_msrle_decode(avctx, s->frame, avctx->bits_per_coded_sample, &s->gb); |
142 | } |
143 | |
144 | if ((ret = av_frame_ref(data, s->frame)) < 0) |
145 | return ret; |
146 | |
147 | *got_frame = 1; |
148 | |
149 | /* report that the buffer was completely consumed */ |
150 | return buf_size; |
151 | } |
152 | |
153 | static av_cold int msrle_decode_end(AVCodecContext *avctx) |
154 | { |
155 | MsrleContext *s = avctx->priv_data; |
156 | |
157 | /* release the last frame */ |
158 | av_frame_free(&s->frame); |
159 | |
160 | return 0; |
161 | } |
162 | |
163 | AVCodec ff_msrle_decoder = { |
164 | .name = "msrle", |
165 | .long_name = NULL_IF_CONFIG_SMALL("Microsoft RLE"), |
166 | .type = AVMEDIA_TYPE_VIDEO, |
167 | .id = AV_CODEC_ID_MSRLE, |
168 | .priv_data_size = sizeof(MsrleContext), |
169 | .init = msrle_decode_init, |
170 | .close = msrle_decode_end, |
171 | .decode = msrle_decode_frame, |
172 | .capabilities = AV_CODEC_CAP_DR1, |
173 | }; |
174 |