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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 "internal.h"
33 #include "msrledec.h"
34 
35 typedef struct AascContext {
39 
42 } AascContext;
43 
45 {
46  AascContext *s = avctx->priv_data;
47  uint8_t *ptr;
48  int i;
49 
50  s->avctx = avctx;
51  switch (avctx->bits_per_coded_sample) {
52  case 8:
53  avctx->pix_fmt = AV_PIX_FMT_PAL8;
54 
55  ptr = avctx->extradata;
57  for (i = 0; i < s->palette_size / 4; i++) {
58  s->palette[i] = 0xFFU << 24 | AV_RL32(ptr);
59  ptr += 4;
60  }
61  break;
62  case 16:
64  break;
65  case 24:
66  avctx->pix_fmt = AV_PIX_FMT_BGR24;
67  break;
68  default:
69  av_log(avctx, AV_LOG_ERROR, "Unsupported bit depth: %d\n", avctx->bits_per_coded_sample);
70  return -1;
71  }
72 
73  s->frame = av_frame_alloc();
74  if (!s->frame)
75  return AVERROR(ENOMEM);
76 
77  return 0;
78 }
79 
81  void *data, int *got_frame,
82  AVPacket *avpkt)
83 {
84  const uint8_t *buf = avpkt->data;
85  int buf_size = avpkt->size;
86  AascContext *s = avctx->priv_data;
87  int compr, i, stride, psize, ret;
88 
89  if (buf_size < 4) {
90  av_log(avctx, AV_LOG_ERROR, "frame too short\n");
91  return AVERROR_INVALIDDATA;
92  }
93 
94  if ((ret = ff_reget_buffer(avctx, s->frame)) < 0)
95  return ret;
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  if (buf_size < stride * avctx->height)
111  return AVERROR_INVALIDDATA;
112  for (i = avctx->height - 1; i >= 0; i--) {
113  memcpy(s->frame->data[0] + i * s->frame->linesize[0], buf, avctx->width * psize);
114  buf += stride;
115  buf_size -= stride;
116  }
117  break;
118  case 1:
119  bytestream2_init(&s->gb, buf, buf_size);
120  ff_msrle_decode(avctx, (AVPicture*)s->frame, 8, &s->gb);
121  break;
122  default:
123  av_log(avctx, AV_LOG_ERROR, "Unknown compression type %d\n", compr);
124  return AVERROR_INVALIDDATA;
125  }
126  break;
127  default:
128  av_log(avctx, AV_LOG_ERROR, "Unknown FourCC: %X\n", avctx->codec_tag);
129  return -1;
130  }
131 
132  if (avctx->pix_fmt == AV_PIX_FMT_PAL8)
133  memcpy(s->frame->data[1], s->palette, s->palette_size);
134 
135  *got_frame = 1;
136  if ((ret = av_frame_ref(data, s->frame)) < 0)
137  return ret;
138 
139  /* report that the buffer was completely consumed */
140  return avpkt->size;
141 }
142 
144 {
145  AascContext *s = avctx->priv_data;
146 
147  av_frame_free(&s->frame);
148 
149  return 0;
150 }
151 
153  .name = "aasc",
154  .long_name = NULL_IF_CONFIG_SMALL("Autodesk RLE"),
155  .type = AVMEDIA_TYPE_VIDEO,
156  .id = AV_CODEC_ID_AASC,
157  .priv_data_size = sizeof(AascContext),
159  .close = aasc_decode_end,
161  .capabilities = CODEC_CAP_DR1,
162 };