1/*
2 * Autodesk RLE Decoder
3 * Copyright (C) 2005 the ffmpeg project
4 *
5 * This file is part of Libav.
6 *
7 * Libav 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 * Libav 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 Libav; 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 "dsputil.h"
33#include "msrledec.h"
34
35typedef struct AascContext {
36    AVCodecContext *avctx;
37    GetByteContext gb;
38    AVFrame frame;
39} AascContext;
40
41static av_cold int aasc_decode_init(AVCodecContext *avctx)
42{
43    AascContext *s = avctx->priv_data;
44
45    s->avctx = avctx;
46
47    avctx->pix_fmt = PIX_FMT_BGR24;
48
49    return 0;
50}
51
52static int aasc_decode_frame(AVCodecContext *avctx,
53                              void *data, int *data_size,
54                              AVPacket *avpkt)
55{
56    const uint8_t *buf = avpkt->data;
57    int buf_size = avpkt->size;
58    AascContext *s = avctx->priv_data;
59    int compr, i, stride;
60
61    s->frame.reference = 1;
62    s->frame.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
63    if (avctx->reget_buffer(avctx, &s->frame)) {
64        av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
65        return -1;
66    }
67
68    compr = AV_RL32(buf);
69    buf += 4;
70    buf_size -= 4;
71    switch(compr){
72    case 0:
73        stride = (avctx->width * 3 + 3) & ~3;
74        for(i = avctx->height - 1; i >= 0; i--){
75            memcpy(s->frame.data[0] + i*s->frame.linesize[0], buf, avctx->width*3);
76            buf += stride;
77        }
78        break;
79    case 1:
80        bytestream2_init(&s->gb, buf - 4, buf_size + 4);
81        ff_msrle_decode(avctx, (AVPicture*)&s->frame, 8, &s->gb);
82        break;
83    default:
84        av_log(avctx, AV_LOG_ERROR, "Unknown compression type %d\n", compr);
85        return -1;
86    }
87
88    *data_size = sizeof(AVFrame);
89    *(AVFrame*)data = s->frame;
90
91    /* report that the buffer was completely consumed */
92    return buf_size;
93}
94
95static av_cold int aasc_decode_end(AVCodecContext *avctx)
96{
97    AascContext *s = avctx->priv_data;
98
99    /* release the last frame */
100    if (s->frame.data[0])
101        avctx->release_buffer(avctx, &s->frame);
102
103    return 0;
104}
105
106AVCodec ff_aasc_decoder = {
107    .name           = "aasc",
108    .type           = AVMEDIA_TYPE_VIDEO,
109    .id             = CODEC_ID_AASC,
110    .priv_data_size = sizeof(AascContext),
111    .init           = aasc_decode_init,
112    .close          = aasc_decode_end,
113    .decode         = aasc_decode_frame,
114    .capabilities   = CODEC_CAP_DR1,
115    .long_name = NULL_IF_CONFIG_SMALL("Autodesk RLE"),
116};
117