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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, (AVPicture*)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, (AVPicture*)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 buf_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 = CODEC_CAP_DR1, | |
162 | }; |