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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 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 "msrledec.h"
33 
34 typedef struct AascContext {
38 
41 } AascContext;
42 
44 {
45  AascContext *s = avctx->priv_data;
46  uint8_t *ptr;
47  int i;
48 
49  s->avctx = avctx;
50  switch (avctx->bits_per_coded_sample) {
51  case 8:
52  avctx->pix_fmt = AV_PIX_FMT_PAL8;
53 
54  ptr = avctx->extradata;
56  for (i = 0; i < s->palette_size / 4; i++) {
57  s->palette[i] = 0xFFU << 24 | AV_RL32(ptr);
58  ptr += 4;
59  }
60  break;
61  case 16:
63  break;
64  case 24:
65  avctx->pix_fmt = AV_PIX_FMT_BGR24;
66  break;
67  default:
68  av_log(avctx, AV_LOG_ERROR, "Unsupported bit depth: %d\n", avctx->bits_per_coded_sample);
69  return -1;
70  }
72 
73  return 0;
74 }
75 
77  void *data, int *got_frame,
78  AVPacket *avpkt)
79 {
80  const uint8_t *buf = avpkt->data;
81  int buf_size = avpkt->size;
82  AascContext *s = avctx->priv_data;
83  int compr, i, stride, psize, ret;
84 
85  if (buf_size < 4) {
86  av_log(avctx, AV_LOG_ERROR, "frame too short\n");
87  return AVERROR_INVALIDDATA;
88  }
89 
90  s->frame.reference = 3;
92  if ((ret = avctx->reget_buffer(avctx, &s->frame)) < 0) {
93  av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
94  return ret;
95  }
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, (AVPicture*)&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  for (i = avctx->height - 1; i >= 0; i--) {
111  if (avctx->width * psize > buf_size) {
112  av_log(avctx, AV_LOG_ERROR, "Next line is beyond buffer bounds\n");
113  break;
114  }
115  memcpy(s->frame.data[0] + i*s->frame.linesize[0], buf, avctx->width * psize);
116  buf += stride;
117  buf_size -= stride;
118  }
119  break;
120  case 1:
121  bytestream2_init(&s->gb, buf, buf_size);
122  ff_msrle_decode(avctx, (AVPicture*)&s->frame, 8, &s->gb);
123  break;
124  default:
125  av_log(avctx, AV_LOG_ERROR, "Unknown compression type %d\n", compr);
126  return AVERROR_INVALIDDATA;
127  }
128  break;
129  default:
130  av_log(avctx, AV_LOG_ERROR, "Unknown FourCC: %X\n", avctx->codec_tag);
131  return -1;
132  }
133 
134  if (avctx->pix_fmt == AV_PIX_FMT_PAL8)
135  memcpy(s->frame.data[1], s->palette, s->palette_size);
136 
137  *got_frame = 1;
138  *(AVFrame*)data = s->frame;
139 
140  /* report that the buffer was completely consumed */
141  return buf_size;
142 }
143 
145 {
146  AascContext *s = avctx->priv_data;
147 
148  /* release the last frame */
149  if (s->frame.data[0])
150  avctx->release_buffer(avctx, &s->frame);
151 
152  return 0;
153 }
154 
156  .name = "aasc",
157  .type = AVMEDIA_TYPE_VIDEO,
158  .id = AV_CODEC_ID_AASC,
159  .priv_data_size = sizeof(AascContext),
163  .capabilities = CODEC_CAP_DR1,
164  .long_name = NULL_IF_CONFIG_SMALL("Autodesk RLE"),
165 };