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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 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  * Delphine Software International CIN audio/video decoders
25  */
26 
27 #include "libavutil/channel_layout.h"
28 #include "avcodec.h"
29 #include "bytestream.h"
30 #include "internal.h"
31 #include "mathops.h"
32 
33 
34 typedef enum CinVideoBitmapIndex {
35  CIN_CUR_BMP = 0, /* current */
36  CIN_PRE_BMP = 1, /* previous */
37  CIN_INT_BMP = 2 /* intermediate */
38 } CinVideoBitmapIndex;
39 
40 typedef struct CinVideoContext {
41  AVCodecContext *avctx;
42  AVFrame frame;
43  unsigned int bitmap_size;
44  uint32_t palette[256];
45  uint8_t *bitmap_table[3];
46 } CinVideoContext;
47 
48 typedef struct CinAudioContext {
49  AVFrame frame;
50  int initial_decode_frame;
51  int delta;
52 } CinAudioContext;
53 
54 
55 /* table defining a geometric sequence with multiplier = 32767 ^ (1 / 128) */
56 static const int16_t cinaudio_delta16_table[256] = {
57  0, 0, 0, 0, 0, 0, 0, 0,
58  0, 0, 0, 0, 0, 0, 0, 0,
59  0, 0, 0, -30210, -27853, -25680, -23677, -21829,
60  -20126, -18556, -17108, -15774, -14543, -13408, -12362, -11398,
61  -10508, -9689, -8933, -8236, -7593, -7001, -6455, -5951,
62  -5487, -5059, -4664, -4300, -3964, -3655, -3370, -3107,
63  -2865, -2641, -2435, -2245, -2070, -1908, -1759, -1622,
64  -1495, -1379, -1271, -1172, -1080, -996, -918, -847,
65  -781, -720, -663, -612, -564, -520, -479, -442,
66  -407, -376, -346, -319, -294, -271, -250, -230,
67  -212, -196, -181, -166, -153, -141, -130, -120,
68  -111, -102, -94, -87, -80, -74, -68, -62,
69  -58, -53, -49, -45, -41, -38, -35, -32,
70  -30, -27, -25, -23, -21, -20, -18, -17,
71  -15, -14, -13, -12, -11, -10, -9, -8,
72  -7, -6, -5, -4, -3, -2, -1, 0,
73  0, 1, 2, 3, 4, 5, 6, 7,
74  8, 9, 10, 11, 12, 13, 14, 15,
75  17, 18, 20, 21, 23, 25, 27, 30,
76  32, 35, 38, 41, 45, 49, 53, 58,
77  62, 68, 74, 80, 87, 94, 102, 111,
78  120, 130, 141, 153, 166, 181, 196, 212,
79  230, 250, 271, 294, 319, 346, 376, 407,
80  442, 479, 520, 564, 612, 663, 720, 781,
81  847, 918, 996, 1080, 1172, 1271, 1379, 1495,
82  1622, 1759, 1908, 2070, 2245, 2435, 2641, 2865,
83  3107, 3370, 3655, 3964, 4300, 4664, 5059, 5487,
84  5951, 6455, 7001, 7593, 8236, 8933, 9689, 10508,
85  11398, 12362, 13408, 14543, 15774, 17108, 18556, 20126,
86  21829, 23677, 25680, 27853, 30210, 0, 0, 0,
87  0, 0, 0, 0, 0, 0, 0, 0,
88  0, 0, 0, 0, 0, 0, 0, 0
89 };
90 
91 static av_cold void destroy_buffers(CinVideoContext *cin)
92 {
93  int i;
94 
95  for (i = 0; i < 3; ++i)
96  av_freep(&cin->bitmap_table[i]);
97 }
98 
99 static av_cold int allocate_buffers(CinVideoContext *cin)
100 {
101  int i;
102 
103  for (i = 0; i < 3; ++i) {
104  cin->bitmap_table[i] = av_mallocz(cin->bitmap_size);
105  if (!cin->bitmap_table[i]) {
106  av_log(cin->avctx, AV_LOG_ERROR, "Can't allocate bitmap buffers.\n");
107  destroy_buffers(cin);
108  return AVERROR(ENOMEM);
109  }
110  }
111 
112  return 0;
113 }
114 
115 static av_cold int cinvideo_decode_init(AVCodecContext *avctx)
116 {
117  CinVideoContext *cin = avctx->priv_data;
118 
119  cin->avctx = avctx;
120  avctx->pix_fmt = AV_PIX_FMT_PAL8;
121 
122  avcodec_get_frame_defaults(&cin->frame);
123 
124  cin->bitmap_size = avctx->width * avctx->height;
125  if (allocate_buffers(cin))
126  return AVERROR(ENOMEM);
127 
128  return 0;
129 }
130 
131 static void cin_apply_delta_data(const unsigned char *src, unsigned char *dst, int size)
132 {
133  while (size--)
134  *dst++ += *src++;
135 }
136 
137 static int cin_decode_huffman(const unsigned char *src, int src_size, unsigned char *dst, int dst_size)
138 {
139  int b, huff_code = 0;
140  unsigned char huff_code_table[15];
141  unsigned char *dst_cur = dst;
142  unsigned char *dst_end = dst + dst_size;
143  const unsigned char *src_end = src + src_size;
144 
145  memcpy(huff_code_table, src, 15); src += 15;
146 
147  while (src < src_end) {
148  huff_code = *src++;
149  if ((huff_code >> 4) == 15) {
150  b = huff_code << 4;
151  huff_code = *src++;
152  *dst_cur++ = b | (huff_code >> 4);
153  } else
154  *dst_cur++ = huff_code_table[huff_code >> 4];
155  if (dst_cur >= dst_end)
156  break;
157 
158  huff_code &= 15;
159  if (huff_code == 15) {
160  *dst_cur++ = *src++;
161  } else
162  *dst_cur++ = huff_code_table[huff_code];
163  if (dst_cur >= dst_end)
164  break;
165  }
166 
167  return dst_cur - dst;
168 }
169 
170 static int cin_decode_lzss(const unsigned char *src, int src_size, unsigned char *dst, int dst_size)
171 {
172  uint16_t cmd;
173  int i, sz, offset, code;
174  unsigned char *dst_end = dst + dst_size, *dst_start = dst;
175  const unsigned char *src_end = src + src_size;
176 
177  while (src < src_end && dst < dst_end) {
178  code = *src++;
179  for (i = 0; i < 8 && src < src_end && dst < dst_end; ++i) {
180  if (code & (1 << i)) {
181  *dst++ = *src++;
182  } else {
183  cmd = AV_RL16(src); src += 2;
184  offset = cmd >> 4;
185  if ((int) (dst - dst_start) < offset + 1)
186  return AVERROR_INVALIDDATA;
187  sz = (cmd & 0xF) + 2;
188  /* don't use memcpy/memmove here as the decoding routine (ab)uses */
189  /* buffer overlappings to repeat bytes in the destination */
190  sz = FFMIN(sz, dst_end - dst);
191  while (sz--) {
192  *dst = *(dst - offset - 1);
193  ++dst;
194  }
195  }
196  }
197  }
198 
199  return 0;
200 }
201 
202 static int cin_decode_rle(const unsigned char *src, int src_size, unsigned char *dst, int dst_size)
203 {
204  int len, code;
205  unsigned char *dst_end = dst + dst_size;
206  const unsigned char *src_end = src + src_size;
207 
208  while (src + 1 < src_end && dst < dst_end) {
209  code = *src++;
210  if (code & 0x80) {
211  len = code - 0x7F;
212  memset(dst, *src++, FFMIN(len, dst_end - dst));
213  } else {
214  len = code + 1;
215  if (len > src_end-src) {
216  av_log(NULL, AV_LOG_ERROR, "RLE overread\n");
217  return AVERROR_INVALIDDATA;
218  }
219  memcpy(dst, src, FFMIN(len, dst_end - dst));
220  src += len;
221  }
222  dst += len;
223  }
224  return 0;
225 }
226 
227 static int cinvideo_decode_frame(AVCodecContext *avctx,
228  void *data, int *got_frame,
229  AVPacket *avpkt)
230 {
231  const uint8_t *buf = avpkt->data;
232  int buf_size = avpkt->size;
233  CinVideoContext *cin = avctx->priv_data;
234  int i, y, palette_type, palette_colors_count, bitmap_frame_type, bitmap_frame_size, res = 0;
235 
236  palette_type = buf[0];
237  palette_colors_count = AV_RL16(buf+1);
238  bitmap_frame_type = buf[3];
239  buf += 4;
240 
241  bitmap_frame_size = buf_size - 4;
242 
243  /* handle palette */
244  if (bitmap_frame_size < palette_colors_count * (3 + (palette_type != 0)))
245  return AVERROR_INVALIDDATA;
246  if (palette_type == 0) {
247  if (palette_colors_count > 256)
248  return AVERROR_INVALIDDATA;
249  for (i = 0; i < palette_colors_count; ++i) {
250  cin->palette[i] = 0xFFU << 24 | bytestream_get_le24(&buf);
251  bitmap_frame_size -= 3;
252  }
253  } else {
254  for (i = 0; i < palette_colors_count; ++i) {
255  cin->palette[buf[0]] = 0xFFU << 24 | AV_RL24(buf+1);
256  buf += 4;
257  bitmap_frame_size -= 4;
258  }
259  }
260 
261  /* note: the decoding routines below assumes that surface.width = surface.pitch */
262  switch (bitmap_frame_type) {
263  case 9:
264  cin_decode_rle(buf, bitmap_frame_size,
265  cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
266  break;
267  case 34:
268  cin_decode_rle(buf, bitmap_frame_size,
269  cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
270  cin_apply_delta_data(cin->bitmap_table[CIN_PRE_BMP],
271  cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
272  break;
273  case 35:
274  bitmap_frame_size = cin_decode_huffman(buf, bitmap_frame_size,
275  cin->bitmap_table[CIN_INT_BMP], cin->bitmap_size);
276  cin_decode_rle(cin->bitmap_table[CIN_INT_BMP], bitmap_frame_size,
277  cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
278  break;
279  case 36:
280  bitmap_frame_size = cin_decode_huffman(buf, bitmap_frame_size,
281  cin->bitmap_table[CIN_INT_BMP], cin->bitmap_size);
282  cin_decode_rle(cin->bitmap_table[CIN_INT_BMP], bitmap_frame_size,
283  cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
284  cin_apply_delta_data(cin->bitmap_table[CIN_PRE_BMP],
285  cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
286  break;
287  case 37:
288  cin_decode_huffman(buf, bitmap_frame_size,
289  cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
290  break;
291  case 38:
292  res = cin_decode_lzss(buf, bitmap_frame_size,
293  cin->bitmap_table[CIN_CUR_BMP],
294  cin->bitmap_size);
295  if (res < 0)
296  return res;
297  break;
298  case 39:
299  res = cin_decode_lzss(buf, bitmap_frame_size,
300  cin->bitmap_table[CIN_CUR_BMP],
301  cin->bitmap_size);
302  if (res < 0)
303  return res;
304  cin_apply_delta_data(cin->bitmap_table[CIN_PRE_BMP],
305  cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
306  break;
307  }
308 
309  cin->frame.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
310  if ((res = avctx->reget_buffer(avctx, &cin->frame))) {
311  av_log(cin->avctx, AV_LOG_ERROR, "failed to allocate a frame\n");
312  return res;
313  }
314 
315  memcpy(cin->frame.data[1], cin->palette, sizeof(cin->palette));
316  cin->frame.palette_has_changed = 1;
317  for (y = 0; y < cin->avctx->height; ++y)
318  memcpy(cin->frame.data[0] + (cin->avctx->height - 1 - y) * cin->frame.linesize[0],
319  cin->bitmap_table[CIN_CUR_BMP] + y * cin->avctx->width,
320  cin->avctx->width);
321 
322  FFSWAP(uint8_t *, cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_table[CIN_PRE_BMP]);
323 
324  *got_frame = 1;
325  *(AVFrame *)data = cin->frame;
326 
327  return buf_size;
328 }
329 
330 static av_cold int cinvideo_decode_end(AVCodecContext *avctx)
331 {
332  CinVideoContext *cin = avctx->priv_data;
333 
334  if (cin->frame.data[0])
335  avctx->release_buffer(avctx, &cin->frame);
336 
337  destroy_buffers(cin);
338 
339  return 0;
340 }
341 
342 static av_cold int cinaudio_decode_init(AVCodecContext *avctx)
343 {
344  CinAudioContext *cin = avctx->priv_data;
345 
346  cin->initial_decode_frame = 1;
347  cin->delta = 0;
348  avctx->sample_fmt = AV_SAMPLE_FMT_S16;
349  avctx->channels = 1;
350  avctx->channel_layout = AV_CH_LAYOUT_MONO;
351 
352  avcodec_get_frame_defaults(&cin->frame);
353  avctx->coded_frame = &cin->frame;
354 
355  return 0;
356 }
357 
358 static int cinaudio_decode_frame(AVCodecContext *avctx, void *data,
359  int *got_frame_ptr, AVPacket *avpkt)
360 {
361  const uint8_t *buf = avpkt->data;
362  CinAudioContext *cin = avctx->priv_data;
363  const uint8_t *buf_end = buf + avpkt->size;
364  int16_t *samples;
365  int delta, ret;
366 
367  /* get output buffer */
368  cin->frame.nb_samples = avpkt->size - cin->initial_decode_frame;
369  if ((ret = ff_get_buffer(avctx, &cin->frame)) < 0) {
370  av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
371  return ret;
372  }
373  samples = (int16_t *)cin->frame.data[0];
374 
375  delta = cin->delta;
376  if (cin->initial_decode_frame) {
377  cin->initial_decode_frame = 0;
378  delta = sign_extend(AV_RL16(buf), 16);
379  buf += 2;
380  *samples++ = delta;
381  }
382  while (buf < buf_end) {
383  delta += cinaudio_delta16_table[*buf++];
384  delta = av_clip_int16(delta);
385  *samples++ = delta;
386  }
387  cin->delta = delta;
388 
389  *got_frame_ptr = 1;
390  *(AVFrame *)data = cin->frame;
391 
392  return avpkt->size;
393 }
394 
395 
396 AVCodec ff_dsicinvideo_decoder = {
397  .name = "dsicinvideo",
398  .type = AVMEDIA_TYPE_VIDEO,
399  .id = AV_CODEC_ID_DSICINVIDEO,
400  .priv_data_size = sizeof(CinVideoContext),
401  .init = cinvideo_decode_init,
402  .close = cinvideo_decode_end,
403  .decode = cinvideo_decode_frame,
404  .capabilities = CODEC_CAP_DR1,
405  .long_name = NULL_IF_CONFIG_SMALL("Delphine Software International CIN video"),
406 };
407 
408 AVCodec ff_dsicinaudio_decoder = {
409  .name = "dsicinaudio",
410  .type = AVMEDIA_TYPE_AUDIO,
411  .id = AV_CODEC_ID_DSICINAUDIO,
412  .priv_data_size = sizeof(CinAudioContext),
413  .init = cinaudio_decode_init,
414  .decode = cinaudio_decode_frame,
415  .capabilities = CODEC_CAP_DR1,
416  .long_name = NULL_IF_CONFIG_SMALL("Delphine Software International CIN audio"),
417 };
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