FFmpeg
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
dsicinav.c
Go to the documentation of this file.
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  cin->frame = av_frame_alloc();
122  if (!cin->frame)
123  return AVERROR(ENOMEM);
124 
125  cin->bitmap_size = avctx->width * avctx->height;
126  if (allocate_buffers(cin))
127  return AVERROR(ENOMEM);
128 
129  return 0;
130 }
131 
132 static void cin_apply_delta_data(const unsigned char *src, unsigned char *dst,
133  int size)
134 {
135  while (size--)
136  *dst++ += *src++;
137 }
138 
139 static int cin_decode_huffman(const unsigned char *src, int src_size,
140  unsigned char *dst, int dst_size)
141 {
142  int b, huff_code = 0;
143  unsigned char huff_code_table[15];
144  unsigned char *dst_cur = dst;
145  unsigned char *dst_end = dst + dst_size;
146  const unsigned char *src_end = src + src_size;
147 
148  memcpy(huff_code_table, src, 15);
149  src += 15;
150 
151  while (src < src_end) {
152  huff_code = *src++;
153  if ((huff_code >> 4) == 15) {
154  b = huff_code << 4;
155  huff_code = *src++;
156  *dst_cur++ = b | (huff_code >> 4);
157  } else
158  *dst_cur++ = huff_code_table[huff_code >> 4];
159  if (dst_cur >= dst_end)
160  break;
161 
162  huff_code &= 15;
163  if (huff_code == 15) {
164  *dst_cur++ = *src++;
165  } else
166  *dst_cur++ = huff_code_table[huff_code];
167  if (dst_cur >= dst_end)
168  break;
169  }
170 
171  return dst_cur - dst;
172 }
173 
174 static int cin_decode_lzss(const unsigned char *src, int src_size,
175  unsigned char *dst, int dst_size)
176 {
177  uint16_t cmd;
178  int i, sz, offset, code;
179  unsigned char *dst_end = dst + dst_size, *dst_start = dst;
180  const unsigned char *src_end = src + src_size;
181 
182  while (src < src_end && dst < dst_end) {
183  code = *src++;
184  for (i = 0; i < 8 && src < src_end && dst < dst_end; ++i) {
185  if (code & (1 << i)) {
186  *dst++ = *src++;
187  } else {
188  cmd = AV_RL16(src);
189  src += 2;
190  offset = cmd >> 4;
191  if ((int)(dst - dst_start) < offset + 1)
192  return AVERROR_INVALIDDATA;
193  sz = (cmd & 0xF) + 2;
194  /* don't use memcpy/memmove here as the decoding routine
195  * (ab)uses buffer overlappings to repeat bytes in the
196  * destination */
197  sz = FFMIN(sz, dst_end - dst);
198  while (sz--) {
199  *dst = *(dst - offset - 1);
200  ++dst;
201  }
202  }
203  }
204  }
205 
206  return 0;
207 }
208 
209 static int cin_decode_rle(const unsigned char *src, int src_size,
210  unsigned char *dst, int dst_size)
211 {
212  int len, code;
213  unsigned char *dst_end = dst + dst_size;
214  const unsigned char *src_end = src + src_size;
215 
216  while (src + 1 < src_end && dst < dst_end) {
217  code = *src++;
218  if (code & 0x80) {
219  len = code - 0x7F;
220  memset(dst, *src++, FFMIN(len, dst_end - dst));
221  } else {
222  len = code + 1;
223  if (len > src_end-src) {
224  av_log(NULL, AV_LOG_ERROR, "RLE overread\n");
225  return AVERROR_INVALIDDATA;
226  }
227  memcpy(dst, src, FFMIN3(len, dst_end - dst, src_end - src));
228  src += len;
229  }
230  dst += len;
231  }
232  return 0;
233 }
234 
235 static int cinvideo_decode_frame(AVCodecContext *avctx,
236  void *data, int *got_frame,
237  AVPacket *avpkt)
238 {
239  const uint8_t *buf = avpkt->data;
240  int buf_size = avpkt->size;
241  CinVideoContext *cin = avctx->priv_data;
242  int i, y, palette_type, palette_colors_count,
243  bitmap_frame_type, bitmap_frame_size, res = 0;
244 
245  palette_type = buf[0];
246  palette_colors_count = AV_RL16(buf + 1);
247  bitmap_frame_type = buf[3];
248  buf += 4;
249 
250  bitmap_frame_size = buf_size - 4;
251 
252  /* handle palette */
253  if (bitmap_frame_size < palette_colors_count * (3 + (palette_type != 0)))
254  return AVERROR_INVALIDDATA;
255  if (palette_type == 0) {
256  if (palette_colors_count > 256)
257  return AVERROR_INVALIDDATA;
258  for (i = 0; i < palette_colors_count; ++i) {
259  cin->palette[i] = 0xFFU << 24 | bytestream_get_le24(&buf);
260  bitmap_frame_size -= 3;
261  }
262  } else {
263  for (i = 0; i < palette_colors_count; ++i) {
264  cin->palette[buf[0]] = 0xFFU << 24 | AV_RL24(buf + 1);
265  buf += 4;
266  bitmap_frame_size -= 4;
267  }
268  }
269 
270  /* note: the decoding routines below assumes that
271  * surface.width = surface.pitch */
272  switch (bitmap_frame_type) {
273  case 9:
274  cin_decode_rle(buf, bitmap_frame_size,
275  cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
276  break;
277  case 34:
278  cin_decode_rle(buf, bitmap_frame_size,
279  cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
280  cin_apply_delta_data(cin->bitmap_table[CIN_PRE_BMP],
281  cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
282  break;
283  case 35:
284  bitmap_frame_size = cin_decode_huffman(buf, bitmap_frame_size,
285  cin->bitmap_table[CIN_INT_BMP], cin->bitmap_size);
286  cin_decode_rle(cin->bitmap_table[CIN_INT_BMP], bitmap_frame_size,
287  cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
288  break;
289  case 36:
290  bitmap_frame_size = cin_decode_huffman(buf, bitmap_frame_size,
291  cin->bitmap_table[CIN_INT_BMP],
292  cin->bitmap_size);
293  cin_decode_rle(cin->bitmap_table[CIN_INT_BMP], bitmap_frame_size,
294  cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
295  cin_apply_delta_data(cin->bitmap_table[CIN_PRE_BMP],
296  cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
297  break;
298  case 37:
299  cin_decode_huffman(buf, bitmap_frame_size,
300  cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
301  break;
302  case 38:
303  res = cin_decode_lzss(buf, bitmap_frame_size,
304  cin->bitmap_table[CIN_CUR_BMP],
305  cin->bitmap_size);
306  if (res < 0)
307  return res;
308  break;
309  case 39:
310  res = cin_decode_lzss(buf, bitmap_frame_size,
311  cin->bitmap_table[CIN_CUR_BMP],
312  cin->bitmap_size);
313  if (res < 0)
314  return res;
315  cin_apply_delta_data(cin->bitmap_table[CIN_PRE_BMP],
316  cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
317  break;
318  }
319 
320  if ((res = ff_reget_buffer(avctx, cin->frame)) < 0)
321  return res;
322 
323  memcpy(cin->frame->data[1], cin->palette, sizeof(cin->palette));
324  cin->frame->palette_has_changed = 1;
325  for (y = 0; y < cin->avctx->height; ++y)
326  memcpy(cin->frame->data[0] + (cin->avctx->height - 1 - y) * cin->frame->linesize[0],
327  cin->bitmap_table[CIN_CUR_BMP] + y * cin->avctx->width,
328  cin->avctx->width);
329 
330  FFSWAP(uint8_t *, cin->bitmap_table[CIN_CUR_BMP],
331  cin->bitmap_table[CIN_PRE_BMP]);
332 
333  if ((res = av_frame_ref(data, cin->frame)) < 0)
334  return res;
335 
336  *got_frame = 1;
337 
338  return buf_size;
339 }
340 
341 static av_cold int cinvideo_decode_end(AVCodecContext *avctx)
342 {
343  CinVideoContext *cin = avctx->priv_data;
344 
345  av_frame_free(&cin->frame);
346 
347  destroy_buffers(cin);
348 
349  return 0;
350 }
351 
352 static av_cold int cinaudio_decode_init(AVCodecContext *avctx)
353 {
354  CinAudioContext *cin = avctx->priv_data;
355 
356  cin->initial_decode_frame = 1;
357  cin->delta = 0;
358  avctx->sample_fmt = AV_SAMPLE_FMT_S16;
359  avctx->channels = 1;
360  avctx->channel_layout = AV_CH_LAYOUT_MONO;
361 
362  return 0;
363 }
364 
365 static int cinaudio_decode_frame(AVCodecContext *avctx, void *data,
366  int *got_frame_ptr, AVPacket *avpkt)
367 {
368  AVFrame *frame = data;
369  const uint8_t *buf = avpkt->data;
370  CinAudioContext *cin = avctx->priv_data;
371  const uint8_t *buf_end = buf + avpkt->size;
372  int16_t *samples;
373  int delta, ret;
374 
375  /* get output buffer */
376  frame->nb_samples = avpkt->size - cin->initial_decode_frame;
377  if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
378  return ret;
379  samples = (int16_t *)frame->data[0];
380 
381  delta = cin->delta;
382  if (cin->initial_decode_frame) {
383  cin->initial_decode_frame = 0;
384  delta = sign_extend(AV_RL16(buf), 16);
385  buf += 2;
386  *samples++ = delta;
387  }
388  while (buf < buf_end) {
389  delta += cinaudio_delta16_table[*buf++];
390  delta = av_clip_int16(delta);
391  *samples++ = delta;
392  }
393  cin->delta = delta;
394 
395  *got_frame_ptr = 1;
396 
397  return avpkt->size;
398 }
399 
400 AVCodec ff_dsicinvideo_decoder = {
401  .name = "dsicinvideo",
402  .long_name = NULL_IF_CONFIG_SMALL("Delphine Software International CIN video"),
403  .type = AVMEDIA_TYPE_VIDEO,
404  .id = AV_CODEC_ID_DSICINVIDEO,
405  .priv_data_size = sizeof(CinVideoContext),
406  .init = cinvideo_decode_init,
407  .close = cinvideo_decode_end,
408  .decode = cinvideo_decode_frame,
409  .capabilities = CODEC_CAP_DR1,
410 };
411 
412 AVCodec ff_dsicinaudio_decoder = {
413  .name = "dsicinaudio",
414  .long_name = NULL_IF_CONFIG_SMALL("Delphine Software International CIN audio"),
415  .type = AVMEDIA_TYPE_AUDIO,
416  .id = AV_CODEC_ID_DSICINAUDIO,
417  .priv_data_size = sizeof(CinAudioContext),
418  .init = cinaudio_decode_init,
419  .decode = cinaudio_decode_frame,
420  .capabilities = CODEC_CAP_DR1,
421 };
Generated on Sun Mar 23 2014 23:49:53 for FFmpeg by   doxygen 1.8.2