FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/smc.c
Date: 2025-07-08 13:42:56
Exec Total Coverage
Lines: 175 219 79.9%
Functions: 4 4 100.0%
Branches: 105 151 69.5%
Line Branch Exec Source
1 /*
2 * Quicktime Graphics (SMC) Video Decoder
3 * Copyright (C) 2003 The FFmpeg project
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 * QT SMC Video Decoder by Mike Melanson (melanson@pcisys.net)
25 * For more information about the SMC format, visit:
26 * http://www.pcisys.net/~melanson/codecs/
27 *
28 * The SMC decoder outputs PAL8 colorspace data.
29 */
30
31 #include <string.h>
32
33 #include "avcodec.h"
34 #include "bytestream.h"
35 #include "codec_internal.h"
36 #include "decode.h"
37
38 #define CPAIR 2
39 #define CQUAD 4
40 #define COCTET 8
41
42 #define COLORS_PER_TABLE 256
43
44 typedef struct SmcContext {
45
46 AVCodecContext *avctx;
47 AVFrame *frame;
48
49 /* SMC color tables */
50 uint8_t color_pairs[COLORS_PER_TABLE * CPAIR];
51 uint8_t color_quads[COLORS_PER_TABLE * CQUAD];
52 uint8_t color_octets[COLORS_PER_TABLE * COCTET];
53
54 uint32_t pal[256];
55 } SmcContext;
56
57 #define GET_BLOCK_COUNT() \
58 (opcode & 0x10) ? (1 + bytestream2_get_byte(gb)) : 1 + (opcode & 0x0F);
59
60 #define ADVANCE_BLOCK() \
61 { \
62 pixel_ptr += 4; \
63 if (pixel_ptr >= width) \
64 { \
65 pixel_ptr = 0; \
66 row_ptr += stride * 4; \
67 } \
68 total_blocks--; \
69 if (total_blocks < !!n_blocks) \
70 { \
71 av_log(s->avctx, AV_LOG_ERROR, "block counter just went negative (this should not happen)\n"); \
72 return AVERROR_INVALIDDATA; \
73 } \
74 }
75
76 320 static int smc_decode_stream(SmcContext *s, GetByteContext *gb)
77 {
78 320 int width = s->avctx->width;
79 320 int height = s->avctx->height;
80 320 int stride = s->frame->linesize[0];
81 int i;
82 int chunk_size;
83 320 int buf_size = bytestream2_size(gb);
84 uint8_t opcode;
85 int n_blocks;
86 unsigned int color_flags;
87 unsigned int color_flags_a;
88 unsigned int color_flags_b;
89 unsigned int flag_mask;
90
91 320 uint8_t * const pixels = s->frame->data[0];
92
93 320 int image_size = height * s->frame->linesize[0];
94 320 int row_ptr = 0;
95 320 int pixel_ptr = 0;
96 int pixel_x, pixel_y;
97 320 int row_inc = stride - 4;
98 int block_ptr;
99 int prev_block_ptr;
100 int prev_block_ptr1, prev_block_ptr2;
101 int prev_block_flag;
102 int total_blocks;
103 int color_table_index; /* indexes to color pair, quad, or octet tables */
104 int pixel;
105
106 320 int color_pair_index = 0;
107 320 int color_quad_index = 0;
108 320 int color_octet_index = 0;
109
110 /* make the palette available */
111 320 memcpy(s->frame->data[1], s->pal, AVPALETTE_SIZE);
112
113 320 bytestream2_skip(gb, 1);
114 320 chunk_size = bytestream2_get_be24(gb);
115
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 320 if (chunk_size != buf_size)
116 ✗ av_log(s->avctx, AV_LOG_WARNING, "MOV chunk size != encoded chunk size (%d != %d); using MOV chunk size\n",
117 chunk_size, buf_size);
118
119 320 chunk_size = buf_size;
120 320 total_blocks = ((s->avctx->width + 3) / 4) * ((s->avctx->height + 3) / 4);
121
122 /* traverse through the blocks */
123
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 1020401 while (total_blocks) {
124 /* sanity checks */
125 /* make sure the row pointer hasn't gone wild */
126
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 1019761 if (row_ptr >= image_size) {
127 ✗ av_log(s->avctx, AV_LOG_ERROR, "just went out of bounds (row ptr = %d, height = %d)\n",
128 row_ptr, image_size);
129 ✗ return AVERROR_INVALIDDATA;
130 }
131
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 1019761 if (bytestream2_get_bytes_left(gb) < 1) {
132 ✗ av_log(s->avctx, AV_LOG_ERROR, "input too small\n");
133 ✗ return AVERROR_INVALIDDATA;
134 }
135
136 1019761 opcode = bytestream2_get_byteu(gb);
137
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 1019761 switch (opcode & 0xF0) {
138 /* skip n blocks */
139 37007 case 0x00:
140 case 0x10:
141
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 37007 n_blocks = GET_BLOCK_COUNT();
142
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 466610 while (n_blocks--) {
143
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 429603 ADVANCE_BLOCK();
144 }
145 37007 break;
146
147 /* repeat last block n times */
148 1110 case 0x20:
149 case 0x30:
150
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 1110 n_blocks = GET_BLOCK_COUNT();
151
152 /* sanity check */
153
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 1110 if ((row_ptr == 0) && (pixel_ptr == 0)) {
154 ✗ av_log(s->avctx, AV_LOG_ERROR, "encountered repeat block opcode (%02X) but no blocks rendered yet\n",
155 opcode & 0xF0);
156 ✗ return AVERROR_INVALIDDATA;
157 }
158
159 /* figure out where the previous block started */
160
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 1110 if (pixel_ptr == 0)
161 ✗ prev_block_ptr1 =
162 ✗ (row_ptr - s->avctx->width * 4) + s->avctx->width - 4;
163 else
164 1110 prev_block_ptr1 = row_ptr + pixel_ptr - 4;
165
166
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 3484 while (n_blocks--) {
167 2374 block_ptr = row_ptr + pixel_ptr;
168 2374 prev_block_ptr = prev_block_ptr1;
169
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 11870 for (pixel_y = 0; pixel_y < 4; pixel_y++) {
170
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 47480 for (pixel_x = 0; pixel_x < 4; pixel_x++) {
171 37984 pixels[block_ptr++] = pixels[prev_block_ptr++];
172 }
173 9496 block_ptr += row_inc;
174 9496 prev_block_ptr += row_inc;
175 }
176
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 2374 ADVANCE_BLOCK();
177 }
178 1110 break;
179
180 /* repeat previous pair of blocks n times */
181 ✗ case 0x40:
182 case 0x50:
183 ✗ n_blocks = GET_BLOCK_COUNT();
184 ✗ n_blocks *= 2;
185
186 /* sanity check */
187 ✗ if ((row_ptr == 0) && (pixel_ptr < 2 * 4)) {
188 ✗ av_log(s->avctx, AV_LOG_ERROR, "encountered repeat block opcode (%02X) but not enough blocks rendered yet\n",
189 opcode & 0xF0);
190 ✗ return AVERROR_INVALIDDATA;
191 }
192
193 /* figure out where the previous 2 blocks started */
194 ✗ if (pixel_ptr == 0)
195 ✗ prev_block_ptr1 = (row_ptr - s->avctx->width * 4) +
196 ✗ s->avctx->width - 4 * 2;
197 ✗ else if (pixel_ptr == 4)
198 ✗ prev_block_ptr1 = (row_ptr - s->avctx->width * 4) + row_inc;
199 else
200 ✗ prev_block_ptr1 = row_ptr + pixel_ptr - 4 * 2;
201
202 ✗ if (pixel_ptr == 0)
203 ✗ prev_block_ptr2 = (row_ptr - s->avctx->width * 4) + row_inc;
204 else
205 ✗ prev_block_ptr2 = row_ptr + pixel_ptr - 4;
206
207 ✗ prev_block_flag = 0;
208 ✗ while (n_blocks--) {
209 ✗ block_ptr = row_ptr + pixel_ptr;
210 ✗ if (prev_block_flag)
211 ✗ prev_block_ptr = prev_block_ptr2;
212 else
213 ✗ prev_block_ptr = prev_block_ptr1;
214 ✗ prev_block_flag = !prev_block_flag;
215
216 ✗ for (pixel_y = 0; pixel_y < 4; pixel_y++) {
217 ✗ for (pixel_x = 0; pixel_x < 4; pixel_x++) {
218 ✗ pixels[block_ptr++] = pixels[prev_block_ptr++];
219 }
220 ✗ block_ptr += row_inc;
221 ✗ prev_block_ptr += row_inc;
222 }
223 ✗ ADVANCE_BLOCK();
224 }
225 ✗ break;
226
227 /* 1-color block encoding */
228 12199 case 0x60:
229 case 0x70:
230
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 12199 n_blocks = GET_BLOCK_COUNT();
231 12199 pixel = bytestream2_get_byte(gb);
232
233
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 63980 while (n_blocks--) {
234 51781 block_ptr = row_ptr + pixel_ptr;
235
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 258905 for (pixel_y = 0; pixel_y < 4; pixel_y++) {
236
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 1035620 for (pixel_x = 0; pixel_x < 4; pixel_x++) {
237 828496 pixels[block_ptr++] = pixel;
238 }
239 207124 block_ptr += row_inc;
240 }
241
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 51781 ADVANCE_BLOCK();
242 }
243 12199 break;
244
245 /* 2-color block encoding */
246 27872 case 0x80:
247 case 0x90:
248 27872 n_blocks = (opcode & 0x0F) + 1;
249
250 /* figure out which color pair to use to paint the 2-color block */
251
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 27872 if ((opcode & 0xF0) == 0x80) {
252 /* fetch the next 2 colors from bytestream and store in next
253 * available entry in the color pair table */
254
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 18330 for (i = 0; i < CPAIR; i++) {
255 12220 pixel = bytestream2_get_byte(gb);
256 12220 color_table_index = CPAIR * color_pair_index + i;
257 12220 s->color_pairs[color_table_index] = pixel;
258 }
259 /* this is the base index to use for this block */
260 6110 color_table_index = CPAIR * color_pair_index;
261 6110 color_pair_index++;
262 /* wraparound */
263
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 6110 if (color_pair_index == COLORS_PER_TABLE)
264 ✗ color_pair_index = 0;
265 } else
266 21762 color_table_index = CPAIR * bytestream2_get_byte(gb);
267
268
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 63698 while (n_blocks--) {
269 35826 color_flags = bytestream2_get_be16(gb);
270 35826 flag_mask = 0x8000;
271 35826 block_ptr = row_ptr + pixel_ptr;
272
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 179130 for (pixel_y = 0; pixel_y < 4; pixel_y++) {
273
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 716520 for (pixel_x = 0; pixel_x < 4; pixel_x++) {
274
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 573216 if (color_flags & flag_mask)
275 306808 pixel = color_table_index + 1;
276 else
277 266408 pixel = color_table_index;
278 573216 flag_mask >>= 1;
279 573216 pixels[block_ptr++] = s->color_pairs[pixel];
280 }
281 143304 block_ptr += row_inc;
282 }
283
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 35826 ADVANCE_BLOCK();
284 }
285 27872 break;
286
287 /* 4-color block encoding */
288 185929 case 0xA0:
289 case 0xB0:
290 185929 n_blocks = (opcode & 0x0F) + 1;
291
292 /* figure out which color quad to use to paint the 4-color block */
293
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 185929 if ((opcode & 0xF0) == 0xA0) {
294 /* fetch the next 4 colors from bytestream and store in next
295 * available entry in the color quad table */
296
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 208685 for (i = 0; i < CQUAD; i++) {
297 166948 pixel = bytestream2_get_byte(gb);
298 166948 color_table_index = CQUAD * color_quad_index + i;
299 166948 s->color_quads[color_table_index] = pixel;
300 }
301 /* this is the base index to use for this block */
302 41737 color_table_index = CQUAD * color_quad_index;
303 41737 color_quad_index++;
304 /* wraparound */
305
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 41737 if (color_quad_index == COLORS_PER_TABLE)
306 49 color_quad_index = 0;
307 } else
308 144192 color_table_index = CQUAD * bytestream2_get_byte(gb);
309
310
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 418468 while (n_blocks--) {
311 232539 color_flags = bytestream2_get_be32(gb);
312 /* flag mask actually acts as a bit shift count here */
313 232539 flag_mask = 30;
314 232539 block_ptr = row_ptr + pixel_ptr;
315
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 1162695 for (pixel_y = 0; pixel_y < 4; pixel_y++) {
316
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 4650780 for (pixel_x = 0; pixel_x < 4; pixel_x++) {
317 3720624 pixel = color_table_index +
318 3720624 ((color_flags >> flag_mask) & 0x03);
319 3720624 flag_mask -= 2;
320 3720624 pixels[block_ptr++] = s->color_quads[pixel];
321 }
322 930156 block_ptr += row_inc;
323 }
324
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 232539 ADVANCE_BLOCK();
325 }
326 185929 break;
327
328 /* 8-color block encoding */
329 546628 case 0xC0:
330 case 0xD0:
331 546628 n_blocks = (opcode & 0x0F) + 1;
332
333 /* figure out which color octet to use to paint the 8-color block */
334
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 546628 if ((opcode & 0xF0) == 0xC0) {
335 /* fetch the next 8 colors from bytestream and store in next
336 * available entry in the color octet table */
337
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 3606696 for (i = 0; i < COCTET; i++) {
338 3205952 pixel = bytestream2_get_byte(gb);
339 3205952 color_table_index = COCTET * color_octet_index + i;
340 3205952 s->color_octets[color_table_index] = pixel;
341 }
342 /* this is the base index to use for this block */
343 400744 color_table_index = COCTET * color_octet_index;
344 400744 color_octet_index++;
345 /* wraparound */
346
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 400744 if (color_octet_index == COLORS_PER_TABLE)
347 1434 color_octet_index = 0;
348 } else
349 145884 color_table_index = COCTET * bytestream2_get_byte(gb);
350
351
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 1115772 while (n_blocks--) {
352 /*
353 For this input of 6 hex bytes:
354 01 23 45 67 89 AB
355 Mangle it to this output:
356 flags_a = xx012456, flags_b = xx89A37B
357 */
358 /* build the color flags */
359 569144 int val1 = bytestream2_get_be16(gb);
360 569144 int val2 = bytestream2_get_be16(gb);
361 569144 int val3 = bytestream2_get_be16(gb);
362 569144 color_flags_a = ((val1 & 0xFFF0) << 8) | (val2 >> 4);
363 569144 color_flags_b = ((val3 & 0xFFF0) << 8) |
364 569144 ((val1 & 0x0F) << 8) | ((val2 & 0x0F) << 4) | (val3 & 0x0F);
365
366 569144 color_flags = color_flags_a;
367 /* flag mask actually acts as a bit shift count here */
368 569144 flag_mask = 21;
369 569144 block_ptr = row_ptr + pixel_ptr;
370
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 2845720 for (pixel_y = 0; pixel_y < 4; pixel_y++) {
371 /* reload flags at third row (iteration pixel_y == 2) */
372
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 2276576 if (pixel_y == 2) {
373 569144 color_flags = color_flags_b;
374 569144 flag_mask = 21;
375 }
376
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 11382880 for (pixel_x = 0; pixel_x < 4; pixel_x++) {
377 9106304 pixel = color_table_index +
378 9106304 ((color_flags >> flag_mask) & 0x07);
379 9106304 flag_mask -= 3;
380 9106304 pixels[block_ptr++] = s->color_octets[pixel];
381 }
382 2276576 block_ptr += row_inc;
383 }
384
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 569144 ADVANCE_BLOCK();
385 }
386 546628 break;
387
388 /* 16-color block encoding (every pixel is a different color) */
389 209016 case 0xE0:
390 case 0xF0:
391 209016 n_blocks = (opcode & 0x0F) + 1;
392
393
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 418199 while (n_blocks--) {
394 209183 block_ptr = row_ptr + pixel_ptr;
395
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 1045915 for (pixel_y = 0; pixel_y < 4; pixel_y++) {
396
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 4183660 for (pixel_x = 0; pixel_x < 4; pixel_x++) {
397 3346928 pixels[block_ptr++] = bytestream2_get_byte(gb);
398 }
399 836732 block_ptr += row_inc;
400 }
401
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 209183 ADVANCE_BLOCK();
402 }
403 209016 break;
404 }
405 }
406
407 320 return 0;
408 }
409
410 10 static av_cold int smc_decode_init(AVCodecContext *avctx)
411 {
412 10 SmcContext *s = avctx->priv_data;
413
414 10 s->avctx = avctx;
415 10 avctx->pix_fmt = AV_PIX_FMT_PAL8;
416
417 10 s->frame = av_frame_alloc();
418
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 10 if (!s->frame)
419 ✗ return AVERROR(ENOMEM);
420
421 10 return 0;
422 }
423
424 320 static int smc_decode_frame(AVCodecContext *avctx, AVFrame *rframe,
425 int *got_frame, AVPacket *avpkt)
426 {
427 320 const uint8_t *buf = avpkt->data;
428 320 int buf_size = avpkt->size;
429 320 SmcContext *s = avctx->priv_data;
430 GetByteContext gb;
431 int ret;
432 320 int total_blocks = ((s->avctx->width + 3) / 4) * ((s->avctx->height + 3) / 4);
433
434
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 320 if (total_blocks / 1024 > avpkt->size)
435 ✗ return AVERROR_INVALIDDATA;
436
437
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 320 if ((ret = ff_reget_buffer(avctx, s->frame, 0)) < 0)
438 ✗ return ret;
439
440 320 ff_copy_palette(s->pal, avpkt, avctx);
441
442 320 bytestream2_init(&gb, buf, buf_size);
443 320 ret = smc_decode_stream(s, &gb);
444
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 320 if (ret < 0)
445 ✗ return ret;
446
447 320 *got_frame = 1;
448
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 320 if ((ret = av_frame_ref(rframe, s->frame)) < 0)
449 ✗ return ret;
450
451 /* always report that the buffer was completely consumed */
452 320 return buf_size;
453 }
454
455 10 static av_cold int smc_decode_end(AVCodecContext *avctx)
456 {
457 10 SmcContext *s = avctx->priv_data;
458
459 10 av_frame_free(&s->frame);
460
461 10 return 0;
462 }
463
464 const FFCodec ff_smc_decoder = {
465 .p.name = "smc",
466 CODEC_LONG_NAME("QuickTime Graphics (SMC)"),
467 .p.type = AVMEDIA_TYPE_VIDEO,
468 .p.id = AV_CODEC_ID_SMC,
469 .priv_data_size = sizeof(SmcContext),
470 .init = smc_decode_init,
471 .close = smc_decode_end,
472 FF_CODEC_DECODE_CB(smc_decode_frame),
473 .p.capabilities = AV_CODEC_CAP_DR1,
474 };
475