Libav
aasc.c
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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 
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 {
39 } AascContext;
40 
42 {
43  AascContext *s = avctx->priv_data;
44 
45  s->avctx = avctx;
46 
47  avctx->pix_fmt = AV_PIX_FMT_BGR24;
48 
49  s->frame = av_frame_alloc();
50  if (!s->frame)
51  return AVERROR(ENOMEM);
52 
53  return 0;
54 }
55 
57  void *data, int *got_frame,
58  AVPacket *avpkt)
59 {
60  const uint8_t *buf = avpkt->data;
61  int buf_size = avpkt->size;
62  AascContext *s = avctx->priv_data;
63  int compr, i, stride, ret;
64 
65  if (buf_size < 4)
66  return AVERROR_INVALIDDATA;
67 
68  if ((ret = ff_reget_buffer(avctx, s->frame)) < 0) {
69  av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
70  return ret;
71  }
72 
73  compr = AV_RL32(buf);
74  buf += 4;
75  buf_size -= 4;
76  switch (compr) {
77  case 0:
78  stride = (avctx->width * 3 + 3) & ~3;
79  if (buf_size < stride * avctx->height)
80  return AVERROR_INVALIDDATA;
81  for (i = avctx->height - 1; i >= 0; i--) {
82  memcpy(s->frame->data[0] + i * s->frame->linesize[0], buf, avctx->width * 3);
83  buf += stride;
84  }
85  break;
86  case 1:
87  bytestream2_init(&s->gb, buf, buf_size);
88  ff_msrle_decode(avctx, (AVPicture*)s->frame, 8, &s->gb);
89  break;
90  default:
91  av_log(avctx, AV_LOG_ERROR, "Unknown compression type %d\n", compr);
92  return AVERROR_INVALIDDATA;
93  }
94 
95  *got_frame = 1;
96  if ((ret = av_frame_ref(data, s->frame)) < 0)
97  return ret;
98 
99  /* report that the buffer was completely consumed */
100  return avpkt->size;
101 }
102 
104 {
105  AascContext *s = avctx->priv_data;
106 
107  av_frame_free(&s->frame);
108 
109  return 0;
110 }
111 
113  .name = "aasc",
114  .long_name = NULL_IF_CONFIG_SMALL("Autodesk RLE"),
115  .type = AVMEDIA_TYPE_VIDEO,
116  .id = AV_CODEC_ID_AASC,
117  .priv_data_size = sizeof(AascContext),
121  .capabilities = CODEC_CAP_DR1,
122 };