summaryrefslogtreecommitdiffstats
path: root/qtsmc.c
blob: a0bd168bd64b874cb1d23e0c36ce603a22185e6e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
/*
    Apple Graphics (SMC) Decoder for MPlayer
    by Mike Melanson

    The description of the decoding algorithm can be found here:
      http://www.pcisys.net/~melanson/codecs/
*/

#include <stdlib.h>
#include "config.h"
#include "bswap.h"
#include "mp_msg.h"

#define BE_16(x) (be2me_16(*(unsigned short *)(x)))
#define BE_32(x) (be2me_32(*(unsigned int *)(x)))

#define COLORS_PER_TABLE 256
#define BYTES_PER_COLOR 4

#define CPAIR 2
#define CQUAD 4
#define COCTET 8

static unsigned char *color_pairs;
static unsigned char *color_quads;
static unsigned char *color_octets;

static int color_pair_index;
static int color_quad_index;
static int color_octet_index;

static int smc_initialized;

// returns 0 if successfully initialized (enough memory was available),
//  non-zero on failure
int qt_init_decode_smc(void)
{
  // be pessimistic to start
  smc_initialized = 0;

  // allocate memory for the 3 palette tables
  if ((color_pairs = (unsigned char *)malloc(
    COLORS_PER_TABLE * BYTES_PER_COLOR * 2)) == 0)
    return 1;  
  if ((color_quads = (unsigned char *)malloc(
    COLORS_PER_TABLE * BYTES_PER_COLOR * 4)) == 0)
    return 1;  
  if ((color_octets = (unsigned char *)malloc(
    COLORS_PER_TABLE * BYTES_PER_COLOR * 8)) == 0)
    return 1;

  color_pair_index = 0;
  color_quad_index = 0;
  color_octet_index = 0;

  // if execution got this far, initialization succeeded
  smc_initialized = 1;
  return 0;
}

#define GET_BLOCK_COUNT \
  (opcode & 0x10) ? (1 + encoded[stream_ptr++]) : 1 + (opcode & 0x0F);
#define ADVANCE_BLOCK() \
{ \
  pixel_ptr += block_x_inc; \
  if (pixel_ptr >= (width * bytes_per_pixel)) \
  { \
    pixel_ptr = 0; \
    row_ptr += block_y_inc * 4; \
  } \
  total_blocks--; \
  if (total_blocks < 0) \
  { \
    mp_msg(MSGT_DECVIDEO, MSGL_WARN, "block counter just went negative (this should not happen)\n"); \
    return; \
  } \
}

void qt_decode_smc(
  unsigned char *encoded,
  int encoded_size,
  unsigned char *decoded,
  int width,
  int height,
  unsigned char *palette_map,
  int bytes_per_pixel)
{
  int i;
  int stream_ptr = 0;
  int chunk_size;
  unsigned char opcode;
  int n_blocks;
  unsigned int color_flags;
  unsigned int color_flags_a;
  unsigned int color_flags_b;
  unsigned int flag_mask;

  int row_ptr = 0;
  int pixel_ptr = 0;
  int pixel_x, pixel_y;
  int row_inc = bytes_per_pixel * (width - 4);
  int max_height = row_inc * height;
  int block_x_inc = bytes_per_pixel * 4;
  int block_y_inc = bytes_per_pixel * width;
  int block_ptr;
  int prev_block_ptr;
  int prev_block_ptr1, prev_block_ptr2;
  int prev_block_flag;
  int total_blocks;
  int color_table_index;  // indexes to color pair, quad, or octet tables
  int color_index;  // indexes into palette map

static int counter;

//printf ("opcode count = %d\n", counter);
counter = 0;

  if (!smc_initialized)
    return;

  chunk_size = BE_32(&encoded[stream_ptr]) & 0x00FFFFFF;
  stream_ptr += 4;
  if (chunk_size != encoded_size)
    mp_msg(MSGT_DECVIDEO, MSGL_WARN, "MOV chunk size != encoded chunk size; using MOV chunk size\n");

  chunk_size = encoded_size;
  total_blocks = (width * height) / (4 * 4);

  // traverse through the blocks
  while (total_blocks)
  {
    // sanity checks
    // make sure stream ptr hasn't gone out of bounds
    if (stream_ptr > chunk_size)
    {
      mp_msg(MSGT_DECVIDEO, MSGL_ERR, 
        "SMC decoder just went out of bounds (stream ptr = %d, chunk size = %d)\n",
        stream_ptr, chunk_size);
      return;
    }
    // make sure the row pointer hasn't gone wild
    if (row_ptr >= max_height)
    {
      mp_msg(MSGT_DECVIDEO, MSGL_ERR, 
        "SMC decoder just went out of bounds (row ptr = %d, height = %d)\n",
        row_ptr, max_height);
      return;
    }

    opcode = encoded[stream_ptr++];
//printf ("opcode %02X\n", opcode & 0xF0);
counter++;
    switch (opcode & 0xF0)
    {
    // skip n blocks
    case 0x00:
    case 0x10:
      n_blocks = GET_BLOCK_COUNT;
      while (n_blocks--)
        ADVANCE_BLOCK();
      break;

    // repeat last block n times
    case 0x20:
    case 0x30:
      n_blocks = GET_BLOCK_COUNT;

      // sanity check
      if ((row_ptr == 0) && (pixel_ptr == 0))
      {
        mp_msg(MSGT_DECVIDEO, MSGL_WARN,
          "encountered repeat block opcode (%02X) but no blocks rendered yet\n",
          opcode & 0xF0);
        break;
      }

      // figure out where the previous block started
      if (row_ptr == 0)
        prev_block_ptr1 = (row_ptr - block_y_inc * 4) + width - 4;
      else
        prev_block_ptr1 = row_ptr + pixel_ptr - 4;

      while (n_blocks--)
      {
        block_ptr = row_ptr + pixel_ptr;
        prev_block_ptr = prev_block_ptr1;
        for (pixel_y = 0; pixel_y < 4; pixel_y++)
        {
          for (pixel_x = 0; pixel_x < 4; pixel_x++)
          {
            decoded[block_ptr++] = decoded[prev_block_ptr++];
            decoded[block_ptr++] = decoded[prev_block_ptr++];
            decoded[block_ptr++] = decoded[prev_block_ptr++];
            if (bytes_per_pixel == 4) /* 32bpp */
              block_ptr++;
          }
          block_ptr += row_inc;
          prev_block_ptr += row_inc;
        }
        ADVANCE_BLOCK();
      }
      break;

    // repeat previous pair of blocks n times
    case 0x40:
    case 0x50:
      n_blocks = GET_BLOCK_COUNT;
      n_blocks *= 2;

      // sanity check
      if ((row_ptr == 0) && (pixel_ptr < 2 * block_x_inc))
      {
        mp_msg(MSGT_DECVIDEO, MSGL_WARN,
          "encountered repeat block opcode (%02X) but not enough blocks rendered yet\n",
          opcode & 0xF0);
        break;
      }

      // figure out where the previous 2 blocks started
      if (row_ptr == 0)
        prev_block_ptr1 = (row_ptr - block_y_inc * 4) + 
          ((width - 4) * bytes_per_pixel);
      else
        prev_block_ptr1 = row_ptr + pixel_ptr - block_x_inc;

      if (row_ptr == 0)
        prev_block_ptr2 = (row_ptr - block_y_inc * 4) + 
          ((width - 8) * bytes_per_pixel);
      else if (row_ptr == block_x_inc)
        prev_block_ptr2 = (row_ptr - block_y_inc * 4) + 
          ((width - 4) * bytes_per_pixel);
      else
        prev_block_ptr2 = row_ptr + pixel_ptr - (block_x_inc * 2);

      prev_block_flag = 0;
      while (n_blocks--)
      {
        block_ptr = row_ptr + pixel_ptr;
        if (prev_block_flag)
          prev_block_ptr = prev_block_ptr2;
        else
          prev_block_ptr = prev_block_ptr1;
        prev_block_flag = !prev_block_flag;

        for (pixel_y = 0; pixel_y < 4; pixel_y++)
        {
          for (pixel_x = 0; pixel_x < 4; pixel_x++)
          {
            decoded[block_ptr++] = decoded[prev_block_ptr++];
            decoded[block_ptr++] = decoded[prev_block_ptr++];
            decoded[block_ptr++] = decoded[prev_block_ptr++];
            if (bytes_per_pixel == 4) /* 32bpp */
              block_ptr++;
          }
          block_ptr += row_inc;
          prev_block_ptr += row_inc;
        }
        ADVANCE_BLOCK();
      }
      break;

    // 1-color block encoding
    case 0x60:
    case 0x70:
      n_blocks = GET_BLOCK_COUNT;
      color_index = encoded[stream_ptr++] * 4;

      while (n_blocks--)
      {
        block_ptr = row_ptr + pixel_ptr;
        for (pixel_y = 0; pixel_y < 4; pixel_y++)
        {
          for (pixel_x = 0; pixel_x < 4; pixel_x++)
          {
            decoded[block_ptr++] = palette_map[color_index + 0];
            decoded[block_ptr++] = palette_map[color_index + 1];
            decoded[block_ptr++] = palette_map[color_index + 2];
            if (bytes_per_pixel == 4) /* 32bpp */
              block_ptr++;
          }
          block_ptr += row_inc;
        }
        ADVANCE_BLOCK();
      }
      break;

    // 2-color block encoding
    case 0x80:
    case 0x90:
      n_blocks = (opcode & 0x0F) + 1;

      // figure out which color pair to use to paint the 2-color block
      if ((opcode & 0xF0) == 0x80)
      {
        // fetch the next 2 colors from bytestream and store in next
        // available entry in the color pair table
        for (i = 0; i < CPAIR; i++)
        {
          color_index = encoded[stream_ptr++] * BYTES_PER_COLOR;
          color_table_index = CPAIR * BYTES_PER_COLOR * color_pair_index + 
            (i * BYTES_PER_COLOR);
          color_pairs[color_table_index + 0] = palette_map[color_index + 0];
          color_pairs[color_table_index + 1] = palette_map[color_index + 1];
          color_pairs[color_table_index + 2] = palette_map[color_index + 2];
        }
        // this is the base index to use for this block
        color_table_index = CPAIR * BYTES_PER_COLOR * color_pair_index;
        color_pair_index++;
        if (color_pair_index == COLORS_PER_TABLE)
          color_pair_index = 0;
      }
      else
        color_table_index = CPAIR * BYTES_PER_COLOR * encoded[stream_ptr++];

      while (n_blocks--)
      {
        color_flags = BE_16(&encoded[stream_ptr]);
        stream_ptr += 2;
        flag_mask = 0x8000;
        block_ptr = row_ptr + pixel_ptr;
        for (pixel_y = 0; pixel_y < 4; pixel_y++)
        {
          for (pixel_x = 0; pixel_x < 4; pixel_x++)
          {
            if (color_flags & flag_mask)
              color_index = color_table_index + BYTES_PER_COLOR;
            else
              color_index = color_table_index;
            flag_mask >>= 1;

            decoded[block_ptr++] = color_pairs[color_index + 0];
            decoded[block_ptr++] = color_pairs[color_index + 1];
            decoded[block_ptr++] = color_pairs[color_index + 2];
            if (bytes_per_pixel == 4) /* 32bpp */
              block_ptr++;
          }
          block_ptr += row_inc;
        }
        ADVANCE_BLOCK();
      }
      break;

    // 4-color block encoding
    case 0xA0:
    case 0xB0:
//for(i = 0; i < 16; i++)
//  printf (" %02X", encoded[stream_ptr - 1 + i]);
//printf ("\n");
      n_blocks = (opcode & 0x0F) + 1;

      // figure out which color quad to use to paint the 4-color block
      if ((opcode & 0xF0) == 0xA0)
      {
        // fetch the next 4 colors from bytestream and store in next
        // available entry in the color pair table
        for (i = 0; i < CQUAD; i++)
        {
          color_index = encoded[stream_ptr++] * BYTES_PER_COLOR;
          color_table_index = CQUAD * BYTES_PER_COLOR * color_quad_index + 
            (i * BYTES_PER_COLOR);
          color_quads[color_table_index + 0] = palette_map[color_index + 0];
          color_quads[color_table_index + 1] = palette_map[color_index + 1];
          color_quads[color_table_index + 2] = palette_map[color_index + 2];
        }
        // this is the base index to use for this block
        color_table_index = CQUAD * BYTES_PER_COLOR * color_quad_index;
        color_quad_index++;
        if (color_quad_index == COLORS_PER_TABLE)
          color_quad_index = 0;
      }
      else
        color_table_index = CQUAD * BYTES_PER_COLOR * encoded[stream_ptr++];

      while (n_blocks--)
      {
        color_flags = BE_32(&encoded[stream_ptr]);
        stream_ptr += 4;
        // flag mask actually acts as a bit shift count here
        flag_mask = 30;
        block_ptr = row_ptr + pixel_ptr;
        for (pixel_y = 0; pixel_y < 4; pixel_y++)
        {
          for (pixel_x = 0; pixel_x < 4; pixel_x++)
          {
            color_index = color_table_index + (BYTES_PER_COLOR * 
              ((color_flags >> flag_mask) & 0x03));
            flag_mask -= 2;

            decoded[block_ptr++] = color_quads[color_index + 0];
            decoded[block_ptr++] = color_quads[color_index + 1];
            decoded[block_ptr++] = color_quads[color_index + 2];
            if (bytes_per_pixel == 4) /* 32bpp */
              block_ptr++;
          }
          block_ptr += row_inc;
        }
        ADVANCE_BLOCK();
      }
      break;

    // 8-color block encoding
    case 0xC0:
    case 0xD0:
      n_blocks = (opcode & 0x0F) + 1;

      // figure out which color octet to use to paint the 8-color block
      if ((opcode & 0xF0) == 0xC0)
      {
        // fetch the next 8 colors from bytestream and store in next
        // available entry in the color pair table
        for (i = 0; i < COCTET; i++)
        {
          color_index = encoded[stream_ptr++] * BYTES_PER_COLOR;
          color_table_index = COCTET * BYTES_PER_COLOR * color_octet_index + 
            (i * BYTES_PER_COLOR);
          color_octets[color_table_index + 0] = palette_map[color_index + 0];
          color_octets[color_table_index + 1] = palette_map[color_index + 1];
          color_octets[color_table_index + 2] = palette_map[color_index + 2];
        }
        // this is the base index to use for this block
        color_table_index = COCTET * BYTES_PER_COLOR * color_octet_index;
        color_octet_index++;
        if (color_octet_index == COLORS_PER_TABLE)
          color_octet_index = 0;
      }
      else
        color_table_index = COCTET * BYTES_PER_COLOR * encoded[stream_ptr++];

      while (n_blocks--)
      {
        // build the color flags
        color_flags_a = color_flags_b = 0;
        color_flags_a |= (encoded[stream_ptr++] << 16);
        color_flags_b |= (encoded[stream_ptr++] << 16);
        color_flags_a |= (encoded[stream_ptr++] << 8);
        color_flags_b |= (encoded[stream_ptr++] << 8);
        color_flags_a |= (encoded[stream_ptr++] << 0);
        color_flags_b |= (encoded[stream_ptr++] << 0);

        color_flags = color_flags_a;
        // flag mask actually acts as a bit shift count here
        flag_mask = 21;
        block_ptr = row_ptr + pixel_ptr;
        for (pixel_y = 0; pixel_y < 4; pixel_y++)
        {
          // reload flags at third row (iteration pixel_y == 2)
          if (pixel_y == 2)
            color_flags = color_flags_b;
          for (pixel_x = 0; pixel_x < 4; pixel_x++)
          {
            color_index = color_table_index + (BYTES_PER_COLOR * 
              ((color_flags >> flag_mask) & 0x07));
            flag_mask -= 3;

            decoded[block_ptr++] = color_octets[color_index + 0];
            decoded[block_ptr++] = color_octets[color_index + 1];
            decoded[block_ptr++] = color_octets[color_index + 2];
            if (bytes_per_pixel == 4) /* 32bpp */
              block_ptr++;
          }
          block_ptr += row_inc;
        }
        ADVANCE_BLOCK();
      }
      break;

    // 16-color block encoding (every pixel is a different color)
    case 0xE0:
      n_blocks = (opcode & 0x0F) + 1;

      while (n_blocks--)
      {
        block_ptr = row_ptr + pixel_ptr;
        for (pixel_y = 0; pixel_y < 4; pixel_y++)
        {
          for (pixel_x = 0; pixel_x < 4; pixel_x++)
          {
            color_index = encoded[stream_ptr++] * BYTES_PER_COLOR;
            decoded[block_ptr++] = palette_map[color_index + 0];
            decoded[block_ptr++] = palette_map[color_index + 1];
            decoded[block_ptr++] = palette_map[color_index + 2];
            if (bytes_per_pixel == 4) /* 32bpp */
              block_ptr++;
          }
          block_ptr += row_inc;
        }
        ADVANCE_BLOCK();
      }
      break;

    case 0xF0:
      mp_msg(MSGT_DECVIDEO, MSGL_HINT, "0xF0 opcode seen in SMC chunk (MPlayer developers would like to know)\n");
      break;
    }
  }
}