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 "dsputil.h"
33 #include "msrledec.h"
34 
35 typedef struct AascContext {
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 
49 {
50  AascContext *s = avctx->priv_data;
51 
52  s->avctx = avctx;
53 
54  avctx->pix_fmt = PIX_FMT_BGR24;
55 
56  return 0;
57 }
58 
60  void *data, int *data_size,
61  AVPacket *avpkt)
62 {
63  const uint8_t *buf = avpkt->data;
64  int buf_size = avpkt->size;
65  AascContext *s = avctx->priv_data;
66  int compr, i, stride;
67 
68  s->frame.reference = 1;
70  if (avctx->reget_buffer(avctx, &s->frame)) {
71  av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
72  return -1;
73  }
74 
75  compr = AV_RL32(buf);
76  buf += 4;
77  buf_size -= 4;
78  switch(compr){
79  case 0:
80  stride = (avctx->width * 3 + 3) & ~3;
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  ff_msrle_decode(avctx, (AVPicture*)&s->frame, 8, buf - 4, buf_size + 4);
88  break;
89  default:
90  av_log(avctx, AV_LOG_ERROR, "Unknown compression type %d\n", compr);
91  return -1;
92  }
93 
94  *data_size = sizeof(AVFrame);
95  *(AVFrame*)data = s->frame;
96 
97  /* report that the buffer was completely consumed */
98  return buf_size;
99 }
100 
102 {
103  AascContext *s = avctx->priv_data;
104 
105  /* release the last frame */
106  if (s->frame.data[0])
107  avctx->release_buffer(avctx, &s->frame);
108 
109  return 0;
110 }
111 
113  .name = "aasc",
114  .type = AVMEDIA_TYPE_VIDEO,
115  .id = CODEC_ID_AASC,
116  .priv_data_size = sizeof(AascContext),
120  .capabilities = CODEC_CAP_DR1,
121  .long_name = NULL_IF_CONFIG_SMALL("Autodesk RLE"),
122 };