blob: 58cc3c85ba89d5907095b9d103c9dacb6bc32687
1 | /* |
2 | * Autodesk RLE Decoder |
3 | * Copyright (C) 2005 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 | * Autodesk RLE Video Decoder by Konstantin Shishkov |
25 | */ |
26 | |
27 | #include <stdio.h> |
28 | #include <stdlib.h> |
29 | #include <string.h> |
30 | |
31 | #include "avcodec.h" |
32 | #include "internal.h" |
33 | #include "msrledec.h" |
34 | |
35 | typedef struct AascContext { |
36 | AVCodecContext *avctx; |
37 | GetByteContext gb; |
38 | AVFrame *frame; |
39 | |
40 | uint32_t palette[AVPALETTE_COUNT]; |
41 | int palette_size; |
42 | } AascContext; |
43 | |
44 | static av_cold int aasc_decode_init(AVCodecContext *avctx) |
45 | { |
46 | AascContext *s = avctx->priv_data; |
47 | uint8_t *ptr; |
48 | int i; |
49 | |
50 | s->avctx = avctx; |
51 | switch (avctx->bits_per_coded_sample) { |
52 | case 8: |
53 | avctx->pix_fmt = AV_PIX_FMT_PAL8; |
54 | |
55 | ptr = avctx->extradata; |
56 | s->palette_size = FFMIN(avctx->extradata_size, AVPALETTE_SIZE); |
57 | for (i = 0; i < s->palette_size / 4; i++) { |
58 | s->palette[i] = 0xFFU << 24 | AV_RL32(ptr); |
59 | ptr += 4; |
60 | } |
61 | break; |
62 | case 16: |
63 | avctx->pix_fmt = AV_PIX_FMT_RGB555LE; |
64 | break; |
65 | case 24: |
66 | avctx->pix_fmt = AV_PIX_FMT_BGR24; |
67 | break; |
68 | default: |
69 | av_log(avctx, AV_LOG_ERROR, "Unsupported bit depth: %d\n", avctx->bits_per_coded_sample); |
70 | return -1; |
71 | } |
72 | |
73 | s->frame = av_frame_alloc(); |
74 | if (!s->frame) |
75 | return AVERROR(ENOMEM); |
76 | |
77 | return 0; |
78 | } |
79 | |
80 | static int aasc_decode_frame(AVCodecContext *avctx, |
81 | void *data, int *got_frame, |
82 | AVPacket *avpkt) |
83 | { |
84 | const uint8_t *buf = avpkt->data; |
85 | int buf_size = avpkt->size; |
86 | AascContext *s = avctx->priv_data; |
87 | int compr, i, stride, psize, ret; |
88 | |
89 | if (buf_size < 4) { |
90 | av_log(avctx, AV_LOG_ERROR, "frame too short\n"); |
91 | return AVERROR_INVALIDDATA; |
92 | } |
93 | |
94 | if ((ret = ff_reget_buffer(avctx, s->frame)) < 0) |
95 | return ret; |
96 | |
97 | compr = AV_RL32(buf); |
98 | buf += 4; |
99 | buf_size -= 4; |
100 | psize = avctx->bits_per_coded_sample / 8; |
101 | switch (avctx->codec_tag) { |
102 | case MKTAG('A', 'A', 'S', '4'): |
103 | bytestream2_init(&s->gb, buf - 4, buf_size + 4); |
104 | ff_msrle_decode(avctx, s->frame, 8, &s->gb); |
105 | break; |
106 | case MKTAG('A', 'A', 'S', 'C'): |
107 | switch (compr) { |
108 | case 0: |
109 | stride = (avctx->width * psize + psize) & ~psize; |
110 | if (buf_size < stride * avctx->height) |
111 | return AVERROR_INVALIDDATA; |
112 | for (i = avctx->height - 1; i >= 0; i--) { |
113 | memcpy(s->frame->data[0] + i * s->frame->linesize[0], buf, avctx->width * psize); |
114 | buf += stride; |
115 | buf_size -= stride; |
116 | } |
117 | break; |
118 | case 1: |
119 | bytestream2_init(&s->gb, buf, buf_size); |
120 | ff_msrle_decode(avctx, s->frame, 8, &s->gb); |
121 | break; |
122 | default: |
123 | av_log(avctx, AV_LOG_ERROR, "Unknown compression type %d\n", compr); |
124 | return AVERROR_INVALIDDATA; |
125 | } |
126 | break; |
127 | default: |
128 | av_log(avctx, AV_LOG_ERROR, "Unknown FourCC: %X\n", avctx->codec_tag); |
129 | return -1; |
130 | } |
131 | |
132 | if (avctx->pix_fmt == AV_PIX_FMT_PAL8) |
133 | memcpy(s->frame->data[1], s->palette, s->palette_size); |
134 | |
135 | *got_frame = 1; |
136 | if ((ret = av_frame_ref(data, s->frame)) < 0) |
137 | return ret; |
138 | |
139 | /* report that the buffer was completely consumed */ |
140 | return avpkt->size; |
141 | } |
142 | |
143 | static av_cold int aasc_decode_end(AVCodecContext *avctx) |
144 | { |
145 | AascContext *s = avctx->priv_data; |
146 | |
147 | av_frame_free(&s->frame); |
148 | |
149 | return 0; |
150 | } |
151 | |
152 | AVCodec ff_aasc_decoder = { |
153 | .name = "aasc", |
154 | .long_name = NULL_IF_CONFIG_SMALL("Autodesk RLE"), |
155 | .type = AVMEDIA_TYPE_VIDEO, |
156 | .id = AV_CODEC_ID_AASC, |
157 | .priv_data_size = sizeof(AascContext), |
158 | .init = aasc_decode_init, |
159 | .close = aasc_decode_end, |
160 | .decode = aasc_decode_frame, |
161 | .capabilities = AV_CODEC_CAP_DR1, |
162 | .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE, |
163 | }; |
164 |