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 "codec_internal.h"
33 #include "internal.h"
34 #include "msrledec.h"
35
36 typedef struct AascContext {
37 AVCodecContext *avctx;
38 GetByteContext gb;
39 AVFrame *frame;
40
41 uint32_t palette[AVPALETTE_COUNT];
42 int palette_size;
43 } AascContext;
44
aasc_decode_init(AVCodecContext *avctx)45 static av_cold int aasc_decode_init(AVCodecContext *avctx)
46 {
47 AascContext *s = avctx->priv_data;
48 uint8_t *ptr;
49 int i;
50
51 s->avctx = avctx;
52 switch (avctx->bits_per_coded_sample) {
53 case 8:
54 avctx->pix_fmt = AV_PIX_FMT_PAL8;
55
56 ptr = avctx->extradata;
57 s->palette_size = FFMIN(avctx->extradata_size, AVPALETTE_SIZE);
58 for (i = 0; i < s->palette_size / 4; i++) {
59 s->palette[i] = 0xFFU << 24 | AV_RL32(ptr);
60 ptr += 4;
61 }
62 break;
63 case 16:
64 avctx->pix_fmt = AV_PIX_FMT_RGB555LE;
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 bit depth: %d\n", avctx->bits_per_coded_sample);
71 return -1;
72 }
73
74 s->frame = av_frame_alloc();
75 if (!s->frame)
76 return AVERROR(ENOMEM);
77
78 return 0;
79 }
80
aasc_decode_frame(AVCodecContext *avctx, AVFrame *rframe, int *got_frame, AVPacket *avpkt)81 static int aasc_decode_frame(AVCodecContext *avctx, AVFrame *rframe,
82 int *got_frame, 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)) < 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(rframe, s->frame)) < 0)
137 return ret;
138
139 /* report that the buffer was completely consumed */
140 return avpkt->size;
141 }
142
aasc_decode_end(AVCodecContext *avctx)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 const FFCodec ff_aasc_decoder = {
153 .p.name = "aasc",
154 .p.long_name = NULL_IF_CONFIG_SMALL("Autodesk RLE"),
155 .p.type = AVMEDIA_TYPE_VIDEO,
156 .p.id = AV_CODEC_ID_AASC,
157 .priv_data_size = sizeof(AascContext),
158 .init = aasc_decode_init,
159 .close = aasc_decode_end,
160 FF_CODEC_DECODE_CB(aasc_decode_frame),
161 .p.capabilities = AV_CODEC_CAP_DR1,
162 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
163 };
164