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brender_pix.c
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1 /*
2  * BRender PIX (.pix) image decoder
3  * Copyright (c) 2012 Aleksi Nurmi
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  * Tested against samples from I-War / Independence War and Defiance.
24  * If the PIX file does not contain a palette, the
25  * palette_has_changed property of the AVFrame is set to 0.
26  */
27 
28 #include "libavutil/imgutils.h"
29 #include "avcodec.h"
30 #include "bytestream.h"
31 #include "internal.h"
32 
33 typedef struct BRPixHeader {
34  int format;
35  unsigned int width, height;
36 } BRPixHeader;
37 
39 {
40  unsigned int header_len = bytestream2_get_be32(pgb);
41 
42  out->format = bytestream2_get_byte(pgb);
43  bytestream2_skip(pgb, 2);
44  out->width = bytestream2_get_be16(pgb);
45  out->height = bytestream2_get_be16(pgb);
46 
47  // the header is at least 11 bytes long; we read the first 7
48  if (header_len < 11) {
49  return 0;
50  }
51 
52  // skip the rest of the header
53  bytestream2_skip(pgb, header_len-7);
54 
55  return 1;
56 }
57 
59  void *data, int *got_frame,
60  AVPacket *avpkt)
61 {
62  AVFrame *frame = data;
63 
64  int ret;
65  GetByteContext gb;
66 
67  unsigned int bytes_pp;
68 
69  unsigned int magic[4];
70  unsigned int chunk_type;
71  unsigned int data_len;
72  BRPixHeader hdr;
73 
74  bytestream2_init(&gb, avpkt->data, avpkt->size);
75 
76  magic[0] = bytestream2_get_be32(&gb);
77  magic[1] = bytestream2_get_be32(&gb);
78  magic[2] = bytestream2_get_be32(&gb);
79  magic[3] = bytestream2_get_be32(&gb);
80 
81  if (magic[0] != 0x12 ||
82  magic[1] != 0x8 ||
83  magic[2] != 0x2 ||
84  magic[3] != 0x2) {
85  av_log(avctx, AV_LOG_ERROR, "Not a BRender PIX file\n");
86  return AVERROR_INVALIDDATA;
87  }
88 
89  chunk_type = bytestream2_get_be32(&gb);
90  if (chunk_type != 0x3 && chunk_type != 0x3d) {
91  av_log(avctx, AV_LOG_ERROR, "Invalid chunk type %d\n", chunk_type);
92  return AVERROR_INVALIDDATA;
93  }
94 
95  ret = brpix_decode_header(&hdr, &gb);
96  if (!ret) {
97  av_log(avctx, AV_LOG_ERROR, "Invalid header length\n");
98  return AVERROR_INVALIDDATA;
99  }
100  switch (hdr.format) {
101  case 3:
102  avctx->pix_fmt = AV_PIX_FMT_PAL8;
103  bytes_pp = 1;
104  break;
105  case 4:
106  avctx->pix_fmt = AV_PIX_FMT_RGB555BE;
107  bytes_pp = 2;
108  break;
109  case 5:
110  avctx->pix_fmt = AV_PIX_FMT_RGB565BE;
111  bytes_pp = 2;
112  break;
113  case 6:
114  avctx->pix_fmt = AV_PIX_FMT_RGB24;
115  bytes_pp = 3;
116  break;
117  case 7:
118  avctx->pix_fmt = AV_PIX_FMT_0RGB;
119  bytes_pp = 4;
120  break;
121  case 18:
122  avctx->pix_fmt = AV_PIX_FMT_GRAY8A;
123  bytes_pp = 2;
124  break;
125  default:
126  av_log(avctx, AV_LOG_ERROR, "Format %d is not supported\n",
127  hdr.format);
128  return AVERROR_PATCHWELCOME;
129  }
130 
131  if (av_image_check_size(hdr.width, hdr.height, 0, avctx) < 0)
132  return AVERROR_INVALIDDATA;
133 
134  if (hdr.width != avctx->width || hdr.height != avctx->height)
135  avcodec_set_dimensions(avctx, hdr.width, hdr.height);
136 
137  if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
138  return ret;
139 
140  chunk_type = bytestream2_get_be32(&gb);
141 
142  if (avctx->pix_fmt == AV_PIX_FMT_PAL8 &&
143  (chunk_type == 0x3 || chunk_type == 0x3d)) {
144  BRPixHeader palhdr;
145  uint32_t *pal_out = (uint32_t *)frame->data[1];
146  int i;
147 
148  ret = brpix_decode_header(&palhdr, &gb);
149  if (!ret) {
150  av_log(avctx, AV_LOG_ERROR, "Invalid palette header length\n");
151  return AVERROR_INVALIDDATA;
152  }
153  if (palhdr.format != 7) {
154  av_log(avctx, AV_LOG_ERROR, "Palette is not in 0RGB format\n");
155  return AVERROR_INVALIDDATA;
156  }
157 
158  chunk_type = bytestream2_get_be32(&gb);
159  data_len = bytestream2_get_be32(&gb);
160  bytestream2_skip(&gb, 8);
161  if (chunk_type != 0x21 || data_len != 1032 ||
162  bytestream2_get_bytes_left(&gb) < 1032) {
163  av_log(avctx, AV_LOG_ERROR, "Invalid palette data\n");
164  return AVERROR_INVALIDDATA;
165  }
166  // convert 0RGB to machine endian format (ARGB32)
167  for (i = 0; i < 256; ++i) {
168  bytestream2_skipu(&gb, 1);
169  *pal_out++ = (0xFFU << 24) | bytestream2_get_be24u(&gb);
170  }
171  bytestream2_skip(&gb, 8);
172 
173  frame->palette_has_changed = 1;
174 
175  chunk_type = bytestream2_get_be32(&gb);
176  } else if (avctx->pix_fmt == AV_PIX_FMT_PAL8) {
177  uint32_t *pal_out = (uint32_t *)frame->data[1];
178  int i;
179 
180  for (i = 0; i < 256; ++i) {
181  *pal_out++ = (0xFFU << 24) | (i * 0x010101);
182  }
183  frame->palette_has_changed = 1;
184  }
185 
186  data_len = bytestream2_get_be32(&gb);
187  bytestream2_skip(&gb, 8);
188 
189  // read the image data to the buffer
190  {
191  unsigned int bytes_per_scanline = bytes_pp * hdr.width;
192  unsigned int bytes_left = bytestream2_get_bytes_left(&gb);
193 
194  if (chunk_type != 0x21 || data_len != bytes_left ||
195  bytes_left / bytes_per_scanline < hdr.height)
196  {
197  av_log(avctx, AV_LOG_ERROR, "Invalid image data\n");
198  return AVERROR_INVALIDDATA;
199  }
200 
201  av_image_copy_plane(frame->data[0], frame->linesize[0],
202  avpkt->data + bytestream2_tell(&gb),
203  bytes_per_scanline,
204  bytes_per_scanline, hdr.height);
205  }
206 
207  *got_frame = 1;
208 
209  return avpkt->size;
210 }
211 
213  .name = "brender_pix",
214  .long_name = NULL_IF_CONFIG_SMALL("BRender PIX image"),
215  .type = AVMEDIA_TYPE_VIDEO,
217  .decode = brpix_decode_frame,
218  .capabilities = CODEC_CAP_DR1,
219 };