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 libavcodec/aasc.c
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    AVFrame frame;
38} AascContext;
39
40#define FETCH_NEXT_STREAM_BYTE() \
41    if (stream_ptr >= buf_size) \
42    { \
43      av_log(s->avctx, AV_LOG_ERROR, " AASC: stream ptr just went out of bounds (fetch)\n"); \
44      break; \
45    } \
46    stream_byte = buf[stream_ptr++];
47
48static av_cold int aasc_decode_init(AVCodecContext *avctx)
49{
50    AascContext *s = avctx->priv_data;
51
52    s->avctx = avctx;
53
54    avctx->pix_fmt = PIX_FMT_BGR24;
55    s->frame.data[0] = NULL;
56
57    return 0;
58}
59
60static int aasc_decode_frame(AVCodecContext *avctx,
61                              void *data, int *data_size,
62                              const uint8_t *buf, int buf_size)
63{
64    AascContext *s = avctx->priv_data;
65    int compr, i, stride;
66
67    s->frame.reference = 1;
68    s->frame.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
69    if (avctx->reget_buffer(avctx, &s->frame)) {
70        av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
71        return -1;
72    }
73
74    compr = AV_RL32(buf);
75    buf += 4;
76    buf_size -= 4;
77    switch(compr){
78    case 0:
79        stride = (avctx->width * 3 + 3) & ~3;
80        for(i = avctx->height - 1; i >= 0; i--){
81            memcpy(s->frame.data[0] + i*s->frame.linesize[0], buf, avctx->width*3);
82            buf += stride;
83        }
84        break;
85    case 1:
86        ff_msrle_decode(avctx, (AVPicture*)&s->frame, 8, buf - 4, buf_size + 4);
87        break;
88    default:
89        av_log(avctx, AV_LOG_ERROR, "Unknown compression type %d\n", compr);
90        return -1;
91    }
92
93    *data_size = sizeof(AVFrame);
94    *(AVFrame*)data = s->frame;
95
96    /* report that the buffer was completely consumed */
97    return buf_size;
98}
99
100static av_cold int aasc_decode_end(AVCodecContext *avctx)
101{
102    AascContext *s = avctx->priv_data;
103
104    /* release the last frame */
105    if (s->frame.data[0])
106        avctx->release_buffer(avctx, &s->frame);
107
108    return 0;
109}
110
111AVCodec aasc_decoder = {
112    "aasc",
113    CODEC_TYPE_VIDEO,
114    CODEC_ID_AASC,
115    sizeof(AascContext),
116    aasc_decode_init,
117    NULL,
118    aasc_decode_end,
119    aasc_decode_frame,
120    CODEC_CAP_DR1,
121    .long_name = NULL_IF_CONFIG_SMALL("Autodesk RLE"),
122};
123