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