dsicinav.c
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1 /*
2  * Delphine Software International CIN Audio/Video Decoders
3  * Copyright (c) 2006 Gregory Montoir (cyx@users.sourceforge.net)
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 "avcodec.h"
28 #include "bytestream.h"
29 #include "mathops.h"
30 
31 
32 typedef enum CinVideoBitmapIndex {
33  CIN_CUR_BMP = 0, /* current */
34  CIN_PRE_BMP = 1, /* previous */
35  CIN_INT_BMP = 2 /* intermediate */
37 
38 typedef struct CinVideoContext {
41  unsigned int bitmap_size;
42  uint32_t palette[256];
43  uint8_t *bitmap_table[3];
45 
46 typedef struct CinAudioContext {
49  int delta;
51 
52 
53 /* table defining a geometric sequence with multiplier = 32767 ^ (1 / 128) */
54 static const int16_t cinaudio_delta16_table[256] = {
55  0, 0, 0, 0, 0, 0, 0, 0,
56  0, 0, 0, 0, 0, 0, 0, 0,
57  0, 0, 0, -30210, -27853, -25680, -23677, -21829,
58  -20126, -18556, -17108, -15774, -14543, -13408, -12362, -11398,
59  -10508, -9689, -8933, -8236, -7593, -7001, -6455, -5951,
60  -5487, -5059, -4664, -4300, -3964, -3655, -3370, -3107,
61  -2865, -2641, -2435, -2245, -2070, -1908, -1759, -1622,
62  -1495, -1379, -1271, -1172, -1080, -996, -918, -847,
63  -781, -720, -663, -612, -564, -520, -479, -442,
64  -407, -376, -346, -319, -294, -271, -250, -230,
65  -212, -196, -181, -166, -153, -141, -130, -120,
66  -111, -102, -94, -87, -80, -74, -68, -62,
67  -58, -53, -49, -45, -41, -38, -35, -32,
68  -30, -27, -25, -23, -21, -20, -18, -17,
69  -15, -14, -13, -12, -11, -10, -9, -8,
70  -7, -6, -5, -4, -3, -2, -1, 0,
71  0, 1, 2, 3, 4, 5, 6, 7,
72  8, 9, 10, 11, 12, 13, 14, 15,
73  17, 18, 20, 21, 23, 25, 27, 30,
74  32, 35, 38, 41, 45, 49, 53, 58,
75  62, 68, 74, 80, 87, 94, 102, 111,
76  120, 130, 141, 153, 166, 181, 196, 212,
77  230, 250, 271, 294, 319, 346, 376, 407,
78  442, 479, 520, 564, 612, 663, 720, 781,
79  847, 918, 996, 1080, 1172, 1271, 1379, 1495,
80  1622, 1759, 1908, 2070, 2245, 2435, 2641, 2865,
81  3107, 3370, 3655, 3964, 4300, 4664, 5059, 5487,
82  5951, 6455, 7001, 7593, 8236, 8933, 9689, 10508,
83  11398, 12362, 13408, 14543, 15774, 17108, 18556, 20126,
84  21829, 23677, 25680, 27853, 30210, 0, 0, 0,
85  0, 0, 0, 0, 0, 0, 0, 0,
86  0, 0, 0, 0, 0, 0, 0, 0
87 };
88 
89 
91 {
92  CinVideoContext *cin = avctx->priv_data;
93  unsigned int i;
94 
95  cin->avctx = avctx;
96  avctx->pix_fmt = PIX_FMT_PAL8;
97 
98  cin->frame.data[0] = NULL;
99 
100  cin->bitmap_size = avctx->width * avctx->height;
101  for (i = 0; i < 3; ++i) {
102  cin->bitmap_table[i] = av_mallocz(cin->bitmap_size);
103  if (!cin->bitmap_table[i])
104  av_log(avctx, AV_LOG_ERROR, "Can't allocate bitmap buffers.\n");
105  }
106 
107  return 0;
108 }
109 
110 static void cin_apply_delta_data(const unsigned char *src, unsigned char *dst, int size)
111 {
112  while (size--)
113  *dst++ += *src++;
114 }
115 
116 static int cin_decode_huffman(const unsigned char *src, int src_size, unsigned char *dst, int dst_size)
117 {
118  int b, huff_code = 0;
119  unsigned char huff_code_table[15];
120  unsigned char *dst_cur = dst;
121  unsigned char *dst_end = dst + dst_size;
122  const unsigned char *src_end = src + src_size;
123 
124  memcpy(huff_code_table, src, 15); src += 15; src_size -= 15;
125 
126  while (src < src_end) {
127  huff_code = *src++;
128  if ((huff_code >> 4) == 15) {
129  b = huff_code << 4;
130  huff_code = *src++;
131  *dst_cur++ = b | (huff_code >> 4);
132  } else
133  *dst_cur++ = huff_code_table[huff_code >> 4];
134  if (dst_cur >= dst_end)
135  break;
136 
137  huff_code &= 15;
138  if (huff_code == 15) {
139  *dst_cur++ = *src++;
140  } else
141  *dst_cur++ = huff_code_table[huff_code];
142  if (dst_cur >= dst_end)
143  break;
144  }
145 
146  return dst_cur - dst;
147 }
148 
149 static int cin_decode_lzss(const unsigned char *src, int src_size, unsigned char *dst, int dst_size)
150 {
151  uint16_t cmd;
152  int i, sz, offset, code;
153  unsigned char *dst_end = dst + dst_size, *dst_start = dst;
154  const unsigned char *src_end = src + src_size;
155 
156  while (src < src_end && dst < dst_end) {
157  code = *src++;
158  for (i = 0; i < 8 && src < src_end && dst < dst_end; ++i) {
159  if (code & (1 << i)) {
160  *dst++ = *src++;
161  } else {
162  cmd = AV_RL16(src); src += 2;
163  offset = cmd >> 4;
164  if ((int) (dst - dst_start) < offset + 1)
165  return AVERROR_INVALIDDATA;
166  sz = (cmd & 0xF) + 2;
167  /* don't use memcpy/memmove here as the decoding routine (ab)uses */
168  /* buffer overlappings to repeat bytes in the destination */
169  sz = FFMIN(sz, dst_end - dst);
170  while (sz--) {
171  *dst = *(dst - offset - 1);
172  ++dst;
173  }
174  }
175  }
176  }
177 
178  return 0;
179 }
180 
181 static void cin_decode_rle(const unsigned char *src, int src_size, unsigned char *dst, int dst_size)
182 {
183  int len, code;
184  unsigned char *dst_end = dst + dst_size;
185  const unsigned char *src_end = src + src_size;
186 
187  while (src < src_end && dst < dst_end) {
188  code = *src++;
189  if (code & 0x80) {
190  len = code - 0x7F;
191  memset(dst, *src++, FFMIN(len, dst_end - dst));
192  } else {
193  len = code + 1;
194  memcpy(dst, src, FFMIN(len, dst_end - dst));
195  src += len;
196  }
197  dst += len;
198  }
199 }
200 
202  void *data, int *data_size,
203  AVPacket *avpkt)
204 {
205  const uint8_t *buf = avpkt->data;
206  int buf_size = avpkt->size;
207  CinVideoContext *cin = avctx->priv_data;
208  int i, y, palette_type, palette_colors_count, bitmap_frame_type, bitmap_frame_size, res = 0;
209 
210  palette_type = buf[0];
211  palette_colors_count = AV_RL16(buf+1);
212  bitmap_frame_type = buf[3];
213  buf += 4;
214 
215  bitmap_frame_size = buf_size - 4;
216 
217  /* handle palette */
218  if (bitmap_frame_size < palette_colors_count * (3 + (palette_type != 0)))
219  return AVERROR_INVALIDDATA;
220  if (palette_type == 0) {
221  if (palette_colors_count > 256)
222  return AVERROR_INVALIDDATA;
223  for (i = 0; i < palette_colors_count; ++i) {
224  cin->palette[i] = bytestream_get_le24(&buf);
225  bitmap_frame_size -= 3;
226  }
227  } else {
228  for (i = 0; i < palette_colors_count; ++i) {
229  cin->palette[buf[0]] = AV_RL24(buf+1);
230  buf += 4;
231  bitmap_frame_size -= 4;
232  }
233  }
234 
235  /* note: the decoding routines below assumes that surface.width = surface.pitch */
236  switch (bitmap_frame_type) {
237  case 9:
238  cin_decode_rle(buf, bitmap_frame_size,
239  cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
240  break;
241  case 34:
242  cin_decode_rle(buf, bitmap_frame_size,
243  cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
245  cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
246  break;
247  case 35:
248  cin_decode_huffman(buf, bitmap_frame_size,
249  cin->bitmap_table[CIN_INT_BMP], cin->bitmap_size);
250  cin_decode_rle(cin->bitmap_table[CIN_INT_BMP], bitmap_frame_size,
251  cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
252  break;
253  case 36:
254  bitmap_frame_size = cin_decode_huffman(buf, bitmap_frame_size,
255  cin->bitmap_table[CIN_INT_BMP], cin->bitmap_size);
256  cin_decode_rle(cin->bitmap_table[CIN_INT_BMP], bitmap_frame_size,
257  cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
259  cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
260  break;
261  case 37:
262  cin_decode_huffman(buf, bitmap_frame_size,
263  cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
264  break;
265  case 38:
266  res = cin_decode_lzss(buf, bitmap_frame_size,
268  cin->bitmap_size);
269  if (res < 0)
270  return res;
271  break;
272  case 39:
273  res = cin_decode_lzss(buf, bitmap_frame_size,
275  cin->bitmap_size);
276  if (res < 0)
277  return res;
279  cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
280  break;
281  }
282 
284  if (avctx->reget_buffer(avctx, &cin->frame)) {
285  av_log(cin->avctx, AV_LOG_ERROR, "delphinecinvideo: reget_buffer() failed to allocate a frame\n");
286  return -1;
287  }
288 
289  memcpy(cin->frame.data[1], cin->palette, sizeof(cin->palette));
290  cin->frame.palette_has_changed = 1;
291  for (y = 0; y < cin->avctx->height; ++y)
292  memcpy(cin->frame.data[0] + (cin->avctx->height - 1 - y) * cin->frame.linesize[0],
293  cin->bitmap_table[CIN_CUR_BMP] + y * cin->avctx->width,
294  cin->avctx->width);
295 
296  FFSWAP(uint8_t *, cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_table[CIN_PRE_BMP]);
297 
298  *data_size = sizeof(AVFrame);
299  *(AVFrame *)data = cin->frame;
300 
301  return buf_size;
302 }
303 
305 {
306  CinVideoContext *cin = avctx->priv_data;
307  int i;
308 
309  if (cin->frame.data[0])
310  avctx->release_buffer(avctx, &cin->frame);
311 
312  for (i = 0; i < 3; ++i)
313  av_free(cin->bitmap_table[i]);
314 
315  return 0;
316 }
317 
319 {
320  CinAudioContext *cin = avctx->priv_data;
321 
322  if (avctx->channels != 1) {
323  av_log_ask_for_sample(avctx, "Number of channels is not supported\n");
324  return AVERROR_PATCHWELCOME;
325  }
326 
327  cin->initial_decode_frame = 1;
328  cin->delta = 0;
329  avctx->sample_fmt = AV_SAMPLE_FMT_S16;
330 
332  avctx->coded_frame = &cin->frame;
333 
334  return 0;
335 }
336 
337 static int cinaudio_decode_frame(AVCodecContext *avctx, void *data,
338  int *got_frame_ptr, AVPacket *avpkt)
339 {
340  const uint8_t *buf = avpkt->data;
341  CinAudioContext *cin = avctx->priv_data;
342  const uint8_t *buf_end = buf + avpkt->size;
343  int16_t *samples;
344  int delta, ret;
345 
346  /* get output buffer */
347  cin->frame.nb_samples = avpkt->size - cin->initial_decode_frame;
348  if ((ret = avctx->get_buffer(avctx, &cin->frame)) < 0) {
349  av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
350  return ret;
351  }
352  samples = (int16_t *)cin->frame.data[0];
353 
354  delta = cin->delta;
355  if (cin->initial_decode_frame) {
356  cin->initial_decode_frame = 0;
357  delta = sign_extend(AV_RL16(buf), 16);
358  buf += 2;
359  *samples++ = delta;
360  }
361  while (buf < buf_end) {
362  delta += cinaudio_delta16_table[*buf++];
363  delta = av_clip_int16(delta);
364  *samples++ = delta;
365  }
366  cin->delta = delta;
367 
368  *got_frame_ptr = 1;
369  *(AVFrame *)data = cin->frame;
370 
371  return avpkt->size;
372 }
373 
374 
376  .name = "dsicinvideo",
377  .type = AVMEDIA_TYPE_VIDEO,
378  .id = CODEC_ID_DSICINVIDEO,
379  .priv_data_size = sizeof(CinVideoContext),
383  .capabilities = CODEC_CAP_DR1,
384  .long_name = NULL_IF_CONFIG_SMALL("Delphine Software International CIN video"),
385 };
386 
388  .name = "dsicinaudio",
389  .type = AVMEDIA_TYPE_AUDIO,
390  .id = CODEC_ID_DSICINAUDIO,
391  .priv_data_size = sizeof(CinAudioContext),
394  .capabilities = CODEC_CAP_DR1,
395  .long_name = NULL_IF_CONFIG_SMALL("Delphine Software International CIN audio"),
396 };