FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/indeo3.c
Date: 2026-01-23 19:11:46
Exec Total Coverage
Lines: 383 485 79.0%
Functions: 16 16 100.0%
Branches: 243 375 64.8%
Line Branch Exec Source
1 /*
2 * Indeo Video v3 compatible decoder
3 * Copyright (c) 2009 - 2011 Maxim Poliakovski
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 * This is a decoder for Intel Indeo Video v3.
25 * It is based on vector quantization, run-length coding and motion compensation.
26 * Known container formats: .avi and .mov
27 * Known FOURCCs: 'IV31', 'IV32'
28 *
29 * @see http://wiki.multimedia.cx/index.php?title=Indeo_3
30 */
31
32 #include "libavutil/imgutils.h"
33 #include "libavutil/intreadwrite.h"
34 #include "libavutil/mem.h"
35 #include "libavutil/thread.h"
36 #include "avcodec.h"
37 #include "codec_internal.h"
38 #include "decode.h"
39 #include "copy_block.h"
40 #include "bytestream.h"
41 #include "get_bits.h"
42 #include "hpeldsp.h"
43
44 #include "indeo3data.h"
45
46 /* RLE opcodes. */
47 enum {
48 RLE_ESC_F9 = 249, ///< same as RLE_ESC_FA + do the same with next block
49 RLE_ESC_FA = 250, ///< INTRA: skip block, INTER: copy data from reference
50 RLE_ESC_FB = 251, ///< apply null delta to N blocks / skip N blocks
51 RLE_ESC_FC = 252, ///< same as RLE_ESC_FD + do the same with next block
52 RLE_ESC_FD = 253, ///< apply null delta to all remaining lines of this block
53 RLE_ESC_FE = 254, ///< apply null delta to all lines up to the 3rd line
54 RLE_ESC_FF = 255 ///< apply null delta to all lines up to the 2nd line
55 };
56
57
58 /* Some constants for parsing frame bitstream flags. */
59 #define BS_8BIT_PEL (1 << 1) ///< 8-bit pixel bitdepth indicator
60 #define BS_KEYFRAME (1 << 2) ///< intra frame indicator
61 #define BS_MV_Y_HALF (1 << 4) ///< vertical mv halfpel resolution indicator
62 #define BS_MV_X_HALF (1 << 5) ///< horizontal mv halfpel resolution indicator
63 #define BS_NONREF (1 << 8) ///< nonref (discardable) frame indicator
64 #define BS_BUFFER 9 ///< indicates which of two frame buffers should be used
65
66
67 typedef struct Plane {
68 uint8_t *buffers[2];
69 uint8_t *pixels[2]; ///< pointer to the actual pixel data of the buffers above
70 uint32_t width;
71 uint32_t height;
72 ptrdiff_t pitch;
73 } Plane;
74
75 #define CELL_STACK_MAX 20
76
77 typedef struct Cell {
78 int16_t xpos; ///< cell coordinates in 4x4 blocks
79 int16_t ypos;
80 int16_t width; ///< cell width in 4x4 blocks
81 int16_t height; ///< cell height in 4x4 blocks
82 uint8_t tree; ///< tree id: 0- MC tree, 1 - VQ tree
83 const int8_t *mv_ptr; ///< ptr to the motion vector if any
84 } Cell;
85
86 typedef struct Indeo3DecodeContext {
87 AVCodecContext *avctx;
88 HpelDSPContext hdsp;
89
90 GetBitContext gb;
91 int need_resync;
92 int skip_bits;
93 const uint8_t *next_cell_data;
94 const uint8_t *last_byte;
95 const int8_t *mc_vectors;
96 unsigned num_vectors; ///< number of motion vectors in mc_vectors
97
98 int16_t width, height;
99 uint32_t frame_num; ///< current frame number (zero-based)
100 int data_size; ///< size of the frame data in bytes
101 uint16_t frame_flags; ///< frame properties
102 uint8_t cb_offset; ///< needed for selecting VQ tables
103 uint8_t buf_sel; ///< active frame buffer: 0 - primary, 1 -secondary
104 const uint8_t *y_data_ptr;
105 const uint8_t *v_data_ptr;
106 const uint8_t *u_data_ptr;
107 int32_t y_data_size;
108 int32_t v_data_size;
109 int32_t u_data_size;
110 const uint8_t *alt_quant; ///< secondary VQ table set for the modes 1 and 4
111 Plane planes[3];
112 } Indeo3DecodeContext;
113
114
115 static uint8_t requant_tab[8][128];
116
117 /*
118 * Build the static requantization table.
119 * This table is used to remap pixel values according to a specific
120 * quant index and thus avoid overflows while adding deltas.
121 */
122 2 static av_cold void build_requant_tab(void)
123 {
124 static const int8_t offsets[8] = { 1, 1, 2, -3, -3, 3, 4, 4 };
125 static const int8_t deltas [8] = { 0, 1, 0, 4, 4, 1, 0, 1 };
126
127 int i, j, step;
128
129
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 18 for (i = 0; i < 8; i++) {
130 16 step = i + 2;
131
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 2064 for (j = 0; j < 128; j++)
132 2048 requant_tab[i][j] = (j + offsets[i]) / step * step + deltas[i];
133 }
134
135 /* some last elements calculated above will have values >= 128 */
136 /* pixel values shall never exceed 127 so set them to non-overflowing values */
137 /* according with the quantization step of the respective section */
138 2 requant_tab[0][127] = 126;
139 2 requant_tab[1][119] = 118;
140 2 requant_tab[1][120] = 118;
141 2 requant_tab[2][126] = 124;
142 2 requant_tab[2][127] = 124;
143 2 requant_tab[6][124] = 120;
144 2 requant_tab[6][125] = 120;
145 2 requant_tab[6][126] = 120;
146 2 requant_tab[6][127] = 120;
147
148 /* Patch for compatibility with the Intel's binary decoders */
149 2 requant_tab[1][7] = 10;
150 2 requant_tab[4][8] = 10;
151 2 }
152
153
154 4 static av_cold void free_frame_buffers(Indeo3DecodeContext *ctx)
155 {
156 int p;
157
158 4 ctx->width = ctx->height = 0;
159
160
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 16 for (p = 0; p < 3; p++) {
161 12 av_freep(&ctx->planes[p].buffers[0]);
162 12 av_freep(&ctx->planes[p].buffers[1]);
163 12 ctx->planes[p].pixels[0] = ctx->planes[p].pixels[1] = 0;
164 }
165 4 }
166
167
168 4 static av_cold int allocate_frame_buffers(Indeo3DecodeContext *ctx,
169 AVCodecContext *avctx, int luma_width, int luma_height)
170 {
171 int p, chroma_width, chroma_height;
172 int luma_size, chroma_size;
173 ptrdiff_t luma_pitch, chroma_pitch;
174
175 4 luma_width = FFALIGN(luma_width , 2);
176 4 luma_height = FFALIGN(luma_height, 2);
177
178
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 4 if (luma_width < 16 || luma_width > 640 ||
179
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 4 luma_height < 16 || luma_height > 480 ||
180
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 4 luma_width & 1 || luma_height & 1) {
181 ✗ av_log(avctx, AV_LOG_ERROR, "Invalid picture dimensions: %d x %d!\n",
182 luma_width, luma_height);
183 ✗ return AVERROR_INVALIDDATA;
184 }
185
186 4 ctx->width = luma_width ;
187 4 ctx->height = luma_height;
188
189 4 chroma_width = FFALIGN(luma_width >> 2, 4);
190 4 chroma_height = FFALIGN(luma_height >> 2, 4);
191
192 4 luma_pitch = FFALIGN(luma_width, 16);
193 4 chroma_pitch = FFALIGN(chroma_width, 16);
194
195 /* Calculate size of the luminance plane. */
196 /* Add one line more for INTRA prediction. */
197 4 luma_size = luma_pitch * (luma_height + 1);
198
199 /* Calculate size of a chrominance planes. */
200 /* Add one line more for INTRA prediction. */
201 4 chroma_size = chroma_pitch * (chroma_height + 1);
202
203 /* allocate frame buffers */
204
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 16 for (p = 0; p < 3; p++) {
205
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 12 ctx->planes[p].pitch = !p ? luma_pitch : chroma_pitch;
206
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 12 ctx->planes[p].width = !p ? luma_width : chroma_width;
207
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 12 ctx->planes[p].height = !p ? luma_height : chroma_height;
208
209
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 12 ctx->planes[p].buffers[0] = av_malloc(!p ? luma_size : chroma_size);
210
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 12 ctx->planes[p].buffers[1] = av_malloc(!p ? luma_size : chroma_size);
211
212
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 12 if (!ctx->planes[p].buffers[0] || !ctx->planes[p].buffers[1])
213 ✗ return AVERROR(ENOMEM);
214
215 /* fill the INTRA prediction lines with the middle pixel value = 64 */
216 12 memset(ctx->planes[p].buffers[0], 0x40, ctx->planes[p].pitch);
217 12 memset(ctx->planes[p].buffers[1], 0x40, ctx->planes[p].pitch);
218
219 /* set buffer pointers = buf_ptr + pitch and thus skip the INTRA prediction line */
220 12 ctx->planes[p].pixels[0] = ctx->planes[p].buffers[0] + ctx->planes[p].pitch;
221 12 ctx->planes[p].pixels[1] = ctx->planes[p].buffers[1] + ctx->planes[p].pitch;
222 12 memset(ctx->planes[p].pixels[0], 0, ctx->planes[p].pitch * ctx->planes[p].height);
223 12 memset(ctx->planes[p].pixels[1], 0, ctx->planes[p].pitch * ctx->planes[p].height);
224 }
225
226 4 return 0;
227 }
228
229 /**
230 * Copy pixels of the cell(x + mv_x, y + mv_y) from the previous frame into
231 * the cell(x, y) in the current frame.
232 *
233 * @param ctx pointer to the decoder context
234 * @param plane pointer to the plane descriptor
235 * @param cell pointer to the cell descriptor
236 */
237 1683 static int copy_cell(Indeo3DecodeContext *ctx, Plane *plane, Cell *cell)
238 {
239 int h, w, mv_x, mv_y, offset, offset_dst;
240 uint8_t *src, *dst;
241
242 /* setup output and reference pointers */
243 1683 offset_dst = (cell->ypos << 2) * plane->pitch + (cell->xpos << 2);
244 1683 dst = plane->pixels[ctx->buf_sel] + offset_dst;
245
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 1683 if(cell->mv_ptr){
246 1683 mv_y = cell->mv_ptr[0];
247 1683 mv_x = cell->mv_ptr[1];
248 }else
249 ✗ mv_x= mv_y= 0;
250
251 /* -1 because there is an extra line on top for prediction */
252
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 1683 if ((cell->ypos << 2) + mv_y < -1 || (cell->xpos << 2) + mv_x < 0 ||
253
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 1683 ((cell->ypos + cell->height) << 2) + mv_y > plane->height ||
254
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 1683 ((cell->xpos + cell->width) << 2) + mv_x > plane->width) {
255 ✗ av_log(ctx->avctx, AV_LOG_ERROR,
256 "Motion vectors point out of the frame.\n");
257 ✗ return AVERROR_INVALIDDATA;
258 }
259
260 1683 offset = offset_dst + mv_y * plane->pitch + mv_x;
261 1683 src = plane->pixels[ctx->buf_sel ^ 1] + offset;
262
263 1683 h = cell->height << 2;
264
265
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 4624 for (w = cell->width; w > 0;) {
266 /* copy using 16xH blocks */
267
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 2941 if (!((cell->xpos << 2) & 15) && w >= 4) {
268
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 1682 for (; w >= 4; src += 16, dst += 16, w -= 4)
269 841 ctx->hdsp.put_pixels_tab[0][0](dst, src, plane->pitch, h);
270 }
271
272 /* copy using 8xH blocks */
273
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 2941 if (!((cell->xpos << 2) & 7) && w >= 2) {
274 2519 ctx->hdsp.put_pixels_tab[1][0](dst, src, plane->pitch, h);
275 2519 w -= 2;
276 2519 src += 8;
277 2519 dst += 8;
278
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 422 } else if (w >= 1) {
279 ✗ ctx->hdsp.put_pixels_tab[2][0](dst, src, plane->pitch, h);
280 ✗ w--;
281 ✗ src += 4;
282 ✗ dst += 4;
283 }
284 }
285
286 1683 return 0;
287 }
288
289
290 /* Average 4/8 pixels at once without rounding using SWAR */
291 #define AVG_32(dst, src, ref) \
292 AV_WN32A(dst, ((AV_RN32(src) + AV_RN32(ref)) >> 1) & 0x7F7F7F7FUL)
293
294 #define AVG_64(dst, src, ref) \
295 AV_WN64A(dst, ((AV_RN64(src) + AV_RN64(ref)) >> 1) & 0x7F7F7F7F7F7F7F7FULL)
296
297
298 /*
299 * Replicate each even pixel as follows:
300 * ABCDEFGH -> AACCEEGG
301 */
302 3811 static inline uint64_t replicate64(uint64_t a) {
303 #if HAVE_BIGENDIAN
304 a &= 0xFF00FF00FF00FF00ULL;
305 a |= a >> 8;
306 #else
307 3811 a &= 0x00FF00FF00FF00FFULL;
308 3811 a |= a << 8;
309 #endif
310 3811 return a;
311 }
312
313 12140 static inline uint32_t replicate32(uint32_t a) {
314 #if HAVE_BIGENDIAN
315 a &= 0xFF00FF00UL;
316 a |= a >> 8;
317 #else
318 12140 a &= 0x00FF00FFUL;
319 12140 a |= a << 8;
320 #endif
321 12140 return a;
322 }
323
324
325 /* Fill n lines with 64-bit pixel value pix */
326 17347 static inline void fill_64(uint8_t *dst, const uint64_t pix, int32_t n,
327 ptrdiff_t row_offset)
328 {
329
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 128722 for (; n > 0; dst += row_offset, n--)
330 111375 AV_WN64A(dst, pix);
331 17347 }
332
333
334 /* Error codes for cell decoding. */
335 enum {
336 IV3_NOERR = 0,
337 IV3_BAD_RLE = 1,
338 IV3_BAD_DATA = 2,
339 IV3_BAD_COUNTER = 3,
340 IV3_UNSUPPORTED = 4,
341 IV3_OUT_OF_DATA = 5
342 };
343
344
345 #define BUFFER_PRECHECK \
346 if (*data_ptr >= last_ptr) \
347 return IV3_OUT_OF_DATA; \
348
349 #define RLE_BLOCK_COPY \
350 if (cell->mv_ptr || !skip_flag) \
351 copy_block4(dst, ref, row_offset, row_offset, 4 << v_zoom)
352
353 #define RLE_BLOCK_COPY_8 \
354 pix64 = AV_RN64(ref);\
355 if (is_first_row) {/* special prediction case: top line of a cell */\
356 pix64 = replicate64(pix64);\
357 fill_64(dst + row_offset, pix64, 7, row_offset);\
358 AVG_64(dst, ref, dst + row_offset);\
359 } else \
360 fill_64(dst, pix64, 8, row_offset)
361
362 #define RLE_LINES_COPY \
363 copy_block4(dst, ref, row_offset, row_offset, num_lines << v_zoom)
364
365 #define RLE_LINES_COPY_M10 \
366 pix64 = AV_RN64(ref);\
367 if (is_top_of_cell) {\
368 pix64 = replicate64(pix64);\
369 fill_64(dst + row_offset, pix64, (num_lines << 1) - 1, row_offset);\
370 AVG_64(dst, ref, dst + row_offset);\
371 } else \
372 fill_64(dst, pix64, num_lines << 1, row_offset)
373
374 #define APPLY_DELTA_4 \
375 AV_WN16A(dst + line_offset ,\
376 (AV_RN16(ref ) + delta_tab->deltas[dyad1]) & 0x7F7F);\
377 AV_WN16A(dst + line_offset + 2,\
378 (AV_RN16(ref + 2) + delta_tab->deltas[dyad2]) & 0x7F7F);\
379 if (mode >= 3) {\
380 if (is_top_of_cell && !cell->ypos) {\
381 AV_COPY32U(dst, dst + row_offset);\
382 } else {\
383 AVG_32(dst, ref, dst + row_offset);\
384 }\
385 }
386
387 #define APPLY_DELTA_8 \
388 /* apply two 32-bit VQ deltas to next even line */\
389 if (is_top_of_cell) { \
390 AV_WN32A(dst + row_offset , \
391 (replicate32(AV_RN32(ref )) + delta_tab->deltas_m10[dyad1]) & 0x7F7F7F7F);\
392 AV_WN32A(dst + row_offset + 4, \
393 (replicate32(AV_RN32(ref + 4)) + delta_tab->deltas_m10[dyad2]) & 0x7F7F7F7F);\
394 } else { \
395 AV_WN32A(dst + row_offset , \
396 (AV_RN32(ref ) + delta_tab->deltas_m10[dyad1]) & 0x7F7F7F7F);\
397 AV_WN32A(dst + row_offset + 4, \
398 (AV_RN32(ref + 4) + delta_tab->deltas_m10[dyad2]) & 0x7F7F7F7F);\
399 } \
400 /* odd lines are not coded but rather interpolated/replicated */\
401 /* first line of the cell on the top of image? - replicate */\
402 /* otherwise - interpolate */\
403 if (is_top_of_cell && !cell->ypos) {\
404 AV_COPY64U(dst, dst + row_offset);\
405 } else \
406 AVG_64(dst, ref, dst + row_offset);
407
408
409 #define APPLY_DELTA_1011_INTER \
410 if (mode == 10) { \
411 AV_WN32A(dst , \
412 (AV_RN32(dst ) + delta_tab->deltas_m10[dyad1]) & 0x7F7F7F7F);\
413 AV_WN32A(dst + 4 , \
414 (AV_RN32(dst + 4 ) + delta_tab->deltas_m10[dyad2]) & 0x7F7F7F7F);\
415 AV_WN32A(dst + row_offset , \
416 (AV_RN32(dst + row_offset ) + delta_tab->deltas_m10[dyad1]) & 0x7F7F7F7F);\
417 AV_WN32A(dst + row_offset + 4, \
418 (AV_RN32(dst + row_offset + 4) + delta_tab->deltas_m10[dyad2]) & 0x7F7F7F7F);\
419 } else { \
420 AV_WN16A(dst , \
421 (AV_RN16(dst ) + delta_tab->deltas[dyad1]) & 0x7F7F);\
422 AV_WN16A(dst + 2 , \
423 (AV_RN16(dst + 2 ) + delta_tab->deltas[dyad2]) & 0x7F7F);\
424 AV_WN16A(dst + row_offset , \
425 (AV_RN16(dst + row_offset ) + delta_tab->deltas[dyad1]) & 0x7F7F);\
426 AV_WN16A(dst + row_offset + 2, \
427 (AV_RN16(dst + row_offset + 2) + delta_tab->deltas[dyad2]) & 0x7F7F);\
428 }
429
430
431 15944 static int decode_cell_data(Indeo3DecodeContext *ctx, Cell *cell,
432 uint8_t *block, const uint8_t *ref_block,
433 ptrdiff_t row_offset, int h_zoom, int v_zoom, int mode,
434 const vqEntry *delta[2], int swap_quads[2],
435 const uint8_t **data_ptr, const uint8_t *last_ptr)
436 {
437 int x, y, line, num_lines;
438 15944 int rle_blocks = 0;
439 const vqEntry *delta_tab;
440 unsigned int dyad1, dyad2;
441 uint64_t pix64;
442 15944 int skip_flag = 0, is_top_of_cell, is_first_row = 1;
443
444 15944 const ptrdiff_t blk_row_offset = (row_offset << (2 + v_zoom)) - (cell->width << 2);
445
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 15944 const ptrdiff_t line_offset = v_zoom ? row_offset : 0;
446
447
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 15944 if (cell->height & v_zoom || cell->width & h_zoom)
448 ✗ return IV3_BAD_DATA;
449
450
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 93487 for (y = 0; y < cell->height; is_first_row = 0, y += 1 + v_zoom) {
451
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 427098 for (x = 0; x < cell->width; x += 1 + h_zoom) {
452 349555 const uint8_t *ref = ref_block;
453 349555 uint8_t *dst = block;
454
455
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 349555 if (rle_blocks > 0) {
456
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 76314 if (mode <= 4) {
457
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 60984 RLE_BLOCK_COPY;
458
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 15330 } else if (mode == 10 && !cell->mv_ptr) {
459
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 8469 RLE_BLOCK_COPY_8;
460 }
461 76314 rle_blocks--;
462 } else {
463
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 1187685 for (line = 0; line < 4;) {
464 914444 num_lines = 1;
465
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 914444 is_top_of_cell = is_first_row && !line;
466
467 /* select primary VQ table for odd, secondary for even lines */
468
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 914444 if (mode <= 4)
469 842209 delta_tab = delta[line & 1];
470 else
471 72235 delta_tab = delta[1];
472
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 914444 BUFFER_PRECHECK;
473 914444 uint8_t code = bytestream_get_byte(data_ptr);
474
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 914444 if (code < 248) {
475
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 809297 if (code < delta_tab->num_dyads) {
476
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 342912 BUFFER_PRECHECK;
477 342912 dyad1 = bytestream_get_byte(data_ptr);
478 342912 dyad2 = code;
479
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 342912 if (dyad1 >= delta_tab->num_dyads || dyad1 >= 248)
480 ✗ return IV3_BAD_DATA;
481 } else {
482 /* process QUADS */
483 466385 code -= delta_tab->num_dyads;
484 466385 dyad1 = code / delta_tab->quad_exp;
485 466385 dyad2 = code % delta_tab->quad_exp;
486
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 466385 if (swap_quads[line & 1])
487 ✗ FFSWAP(unsigned int, dyad1, dyad2);
488 }
489
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 809297 if (mode <= 4) {
490
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 748407 APPLY_DELTA_4;
491
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 60890 } else if (mode == 10 && !cell->mv_ptr) {
492
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 59579 APPLY_DELTA_8;
493 } else {
494
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 1311 APPLY_DELTA_1011_INTER;
495 }
496 } else {
497 /* process RLE codes */
498
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 105147 switch (code) {
499 11658 case RLE_ESC_FC:
500 11658 skip_flag = 0;
501 11658 rle_blocks = 1;
502 11658 code = 253;
503 /* FALLTHROUGH */
504 88796 case RLE_ESC_FF:
505 case RLE_ESC_FE:
506 case RLE_ESC_FD:
507 88796 num_lines = 257 - code - line;
508
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 88796 if (num_lines <= 0)
509 ✗ return IV3_BAD_RLE;
510
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 88796 if (mode <= 4) {
511 80567 RLE_LINES_COPY;
512
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 8229 } else if (mode == 10 && !cell->mv_ptr) {
513
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 7274 RLE_LINES_COPY_M10;
514 }
515 88796 break;
516 14291 case RLE_ESC_FB:
517
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 14291 BUFFER_PRECHECK;
518 14291 code = bytestream_get_byte(data_ptr);
519 14291 rle_blocks = (code & 0x1F) - 1; /* set block counter */
520
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 14291 if (code >= 64 || rle_blocks < 0)
521 ✗ return IV3_BAD_COUNTER;
522 14291 skip_flag = code & 0x20;
523 14291 num_lines = 4 - line; /* enforce next block processing */
524
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 14291 if (mode >= 10 || (cell->mv_ptr || !skip_flag)) {
525
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 14291 if (mode <= 4) {
526 11441 RLE_LINES_COPY;
527
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 2850 } else if (mode == 10 && !cell->mv_ptr) {
528
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 1604 RLE_LINES_COPY_M10;
529 }
530 }
531 14291 break;
532 570 case RLE_ESC_F9:
533 570 skip_flag = 1;
534 570 rle_blocks = 1;
535 /* FALLTHROUGH */
536 2060 case RLE_ESC_FA:
537
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 2060 if (line)
538 ✗ return IV3_BAD_RLE;
539 2060 num_lines = 4; /* enforce next block processing */
540
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 2060 if (cell->mv_ptr) {
541
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 2060 if (mode <= 4) {
542 1794 RLE_LINES_COPY;
543
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 266 } else if (mode == 10 && !cell->mv_ptr) {
544 ✗ RLE_LINES_COPY_M10;
545 }
546 }
547 2060 break;
548 ✗ default:
549 ✗ return IV3_UNSUPPORTED;
550 }
551 }
552
553 914444 line += num_lines;
554 914444 ref += row_offset * (num_lines << v_zoom);
555 914444 dst += row_offset * (num_lines << v_zoom);
556 }
557 }
558
559 /* move to next horizontal block */
560 349555 block += 4 << h_zoom;
561 349555 ref_block += 4 << h_zoom;
562 }
563
564 /* move to next line of blocks */
565 77543 ref_block += blk_row_offset;
566 77543 block += blk_row_offset;
567 }
568 15944 return IV3_NOERR;
569 }
570
571
572 /**
573 * Decode a vector-quantized cell.
574 * It consists of several routines, each of which handles one or more "modes"
575 * with which a cell can be encoded.
576 *
577 * @param ctx pointer to the decoder context
578 * @param avctx ptr to the AVCodecContext
579 * @param plane pointer to the plane descriptor
580 * @param cell pointer to the cell descriptor
581 * @param data_ptr pointer to the compressed data
582 * @param last_ptr pointer to the last byte to catch reads past end of buffer
583 * @return number of consumed bytes or negative number in case of error
584 */
585 15944 static int decode_cell(Indeo3DecodeContext *ctx, AVCodecContext *avctx,
586 Plane *plane, Cell *cell, const uint8_t *data_ptr,
587 const uint8_t *last_ptr)
588 {
589 int x, mv_x, mv_y, mode, vq_index, prim_indx, second_indx;
590 int zoom_fac;
591 15944 int offset, error = 0, swap_quads[2];
592 15944 uint8_t code, *block, *ref_block = 0;
593 const vqEntry *delta[2];
594 15944 const uint8_t *data_start = data_ptr;
595
596 /* get coding mode and VQ table index from the VQ descriptor byte */
597 15944 code = *data_ptr++;
598 15944 mode = code >> 4;
599 15944 vq_index = code & 0xF;
600
601 /* setup output and reference pointers */
602 15944 offset = (cell->ypos << 2) * plane->pitch + (cell->xpos << 2);
603 15944 block = plane->pixels[ctx->buf_sel] + offset;
604
605
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 15944 if (!cell->mv_ptr) {
606 /* use previous line as reference for INTRA cells */
607 12410 ref_block = block - plane->pitch;
608
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 3534 } else if (mode >= 10) {
609 /* for mode 10 and 11 INTER first copy the predicted cell into the current one */
610 /* so we don't need to do data copying for each RLE code later */
611 1227 int ret = copy_cell(ctx, plane, cell);
612
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 1227 if (ret < 0)
613 ✗ return ret;
614 } else {
615 /* set the pointer to the reference pixels for modes 0-4 INTER */
616 2307 mv_y = cell->mv_ptr[0];
617 2307 mv_x = cell->mv_ptr[1];
618
619 /* -1 because there is an extra line on top for prediction */
620
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 2307 if ((cell->ypos << 2) + mv_y < -1 || (cell->xpos << 2) + mv_x < 0 ||
621
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 2307 ((cell->ypos + cell->height) << 2) + mv_y > plane->height ||
622
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 2307 ((cell->xpos + cell->width) << 2) + mv_x > plane->width) {
623 ✗ av_log(ctx->avctx, AV_LOG_ERROR,
624 "Motion vectors point out of the frame.\n");
625 ✗ return AVERROR_INVALIDDATA;
626 }
627
628 2307 offset += mv_y * plane->pitch + mv_x;
629 2307 ref_block = plane->pixels[ctx->buf_sel ^ 1] + offset;
630 }
631
632 /* select VQ tables as follows: */
633 /* modes 0 and 3 use only the primary table for all lines in a block */
634 /* while modes 1 and 4 switch between primary and secondary tables on alternate lines */
635
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 15944 if (mode == 1 || mode == 4) {
636 ✗ code = ctx->alt_quant[vq_index];
637 ✗ prim_indx = (code >> 4) + ctx->cb_offset;
638 ✗ second_indx = (code & 0xF) + ctx->cb_offset;
639 } else {
640 15944 vq_index += ctx->cb_offset;
641 15944 prim_indx = second_indx = vq_index;
642 }
643
644
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 15944 if (prim_indx >= 24 || second_indx >= 24) {
645 ✗ av_log(avctx, AV_LOG_ERROR, "Invalid VQ table indexes! Primary: %d, secondary: %d!\n",
646 prim_indx, second_indx);
647 ✗ return AVERROR_INVALIDDATA;
648 }
649
650 15944 delta[0] = &vq_tab[second_indx];
651 15944 delta[1] = &vq_tab[prim_indx];
652 15944 swap_quads[0] = second_indx >= 16;
653 15944 swap_quads[1] = prim_indx >= 16;
654
655 /* requantize the prediction if VQ index of this cell differs from VQ index */
656 /* of the predicted cell in order to avoid overflows. */
657
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 15944 if (vq_index >= 8 && ref_block) {
658
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 263506 for (x = 0; x < cell->width << 2; x++)
659 251096 ref_block[x] = requant_tab[vq_index & 7][ref_block[x] & 127];
660 }
661
662 15944 error = IV3_NOERR;
663
664
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 15944 switch (mode) {
665 10783 case 0: /*------------------ MODES 0 & 1 (4x4 block processing) --------------------*/
666 case 1:
667 case 3: /*------------------ MODES 3 & 4 (4x8 block processing) --------------------*/
668 case 4:
669
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 10783 if (mode >= 3 && cell->mv_ptr) {
670 ✗ av_log(avctx, AV_LOG_ERROR, "Attempt to apply Mode 3/4 to an INTER cell!\n");
671 ✗ return AVERROR_INVALIDDATA;
672 }
673
674 10783 zoom_fac = mode >= 3;
675 10783 error = decode_cell_data(ctx, cell, block, ref_block, plane->pitch,
676 0, zoom_fac, mode, delta, swap_quads,
677 &data_ptr, last_ptr);
678 10783 break;
679 5161 case 10: /*-------------------- MODE 10 (8x8 block processing) ---------------------*/
680 case 11: /*----------------- MODE 11 (4x8 INTER block processing) ------------------*/
681
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 5161 if (mode == 10 && !cell->mv_ptr) { /* MODE 10 INTRA processing */
682 3934 error = decode_cell_data(ctx, cell, block, ref_block, plane->pitch,
683 1, 1, mode, delta, swap_quads,
684 &data_ptr, last_ptr);
685 } else { /* mode 10 and 11 INTER processing */
686
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 1227 if (mode == 11 && !cell->mv_ptr) {
687 ✗ av_log(avctx, AV_LOG_ERROR, "Attempt to use Mode 11 for an INTRA cell!\n");
688 ✗ return AVERROR_INVALIDDATA;
689 }
690
691 1227 zoom_fac = mode == 10;
692 av_assert2(!ref_block);
693 1227 error = decode_cell_data(ctx, cell, block,
694 block /* dummy to avoid UB pointer arithmetic */,
695 plane->pitch, zoom_fac, 1, mode, delta,
696 swap_quads, &data_ptr, last_ptr);
697 }
698 5161 break;
699 ✗ default:
700 ✗ av_log(avctx, AV_LOG_ERROR, "Unsupported coding mode: %d\n", mode);
701 ✗ return AVERROR_INVALIDDATA;
702 }//switch mode
703
704
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 15944 switch (error) {
705 ✗ case IV3_BAD_RLE:
706 ✗ av_log(avctx, AV_LOG_ERROR, "Mode %d: RLE code %X is not allowed at the current line\n",
707 ✗ mode, data_ptr[-1]);
708 ✗ return AVERROR_INVALIDDATA;
709 ✗ case IV3_BAD_DATA:
710 ✗ av_log(avctx, AV_LOG_ERROR, "Mode %d: invalid VQ data\n", mode);
711 ✗ return AVERROR_INVALIDDATA;
712 ✗ case IV3_BAD_COUNTER:
713 ✗ av_log(avctx, AV_LOG_ERROR, "Mode %d: RLE-FB invalid counter: %d\n", mode, code);
714 ✗ return AVERROR_INVALIDDATA;
715 ✗ case IV3_UNSUPPORTED:
716 ✗ av_log(avctx, AV_LOG_ERROR, "Mode %d: unsupported RLE code: %X\n", mode, data_ptr[-1]);
717 ✗ return AVERROR_INVALIDDATA;
718 ✗ case IV3_OUT_OF_DATA:
719 ✗ av_log(avctx, AV_LOG_ERROR, "Mode %d: attempt to read past end of buffer\n", mode);
720 ✗ return AVERROR_INVALIDDATA;
721 }
722
723 15944 return data_ptr - data_start; /* report number of bytes consumed from the input buffer */
724 }
725
726
727 /* Binary tree codes. */
728 enum {
729 H_SPLIT = 0,
730 V_SPLIT = 1,
731 INTRA_NULL = 2,
732 INTER_DATA = 3
733 };
734
735
736 #define SPLIT_CELL(size, new_size) (new_size) = ((size) > 2) ? ((((size) + 2) >> 2) << 1) : 1
737
738 #define UPDATE_BITPOS(n) \
739 ctx->skip_bits += (n); \
740 ctx->need_resync = 1
741
742 #define RESYNC_BITSTREAM \
743 if (ctx->need_resync && !(get_bits_count(&ctx->gb) & 7)) { \
744 skip_bits_long(&ctx->gb, ctx->skip_bits); \
745 ctx->skip_bits = 0; \
746 ctx->need_resync = 0; \
747 }
748
749 #define CHECK_CELL \
750 if (curr_cell.xpos + curr_cell.width > (plane->width >> 2) || \
751 curr_cell.ypos + curr_cell.height > (plane->height >> 2)) { \
752 av_log(avctx, AV_LOG_ERROR, "Invalid cell: x=%d, y=%d, w=%d, h=%d\n", \
753 curr_cell.xpos, curr_cell.ypos, curr_cell.width, curr_cell.height); \
754 return AVERROR_INVALIDDATA; \
755 }
756
757
758 16400 static int parse_bintree(Indeo3DecodeContext *ctx, AVCodecContext *avctx,
759 Plane *plane, int code, Cell *ref_cell,
760 const int depth, const int strip_width)
761 {
762 Cell curr_cell;
763 int bytes_used, ret;
764
765
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 16400 if (depth <= 0) {
766 ✗ av_log(avctx, AV_LOG_ERROR, "Stack overflow (corrupted binary tree)!\n");
767 ✗ return AVERROR_INVALIDDATA; // unwind recursion
768 }
769
770 16400 curr_cell = *ref_cell; // clone parent cell
771
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 16400 if (code == H_SPLIT) {
772
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 5560 SPLIT_CELL(ref_cell->height, curr_cell.height);
773 5560 ref_cell->ypos += curr_cell.height;
774 5560 ref_cell->height -= curr_cell.height;
775
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 5560 if (ref_cell->height <= 0 || curr_cell.height <= 0)
776 ✗ return AVERROR_INVALIDDATA;
777
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 10840 } else if (code == V_SPLIT) {
778
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 10420 if (curr_cell.width > strip_width) {
779 /* split strip */
780
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 300 curr_cell.width = (curr_cell.width <= (strip_width << 1) ? 1 : 2) * strip_width;
781 } else
782
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 10120 SPLIT_CELL(ref_cell->width, curr_cell.width);
783 10420 ref_cell->xpos += curr_cell.width;
784 10420 ref_cell->width -= curr_cell.width;
785
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 10420 if (ref_cell->width <= 0 || curr_cell.width <= 0)
786 ✗ return AVERROR_INVALIDDATA;
787 }
788
789
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 54389 while (get_bits_left(&ctx->gb) >= 2) { /* loop until return */
790
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 37989 RESYNC_BITSTREAM;
791
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 37989 switch (code = get_bits(&ctx->gb, 2)) {
792 15980 case H_SPLIT:
793 case V_SPLIT:
794
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 15980 if (parse_bintree(ctx, avctx, plane, code, &curr_cell, depth - 1, strip_width))
795 ✗ return AVERROR_INVALIDDATA;
796 15980 break;
797 2829 case INTRA_NULL:
798
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 2829 if (!curr_cell.tree) { /* MC tree INTRA code */
799 2373 curr_cell.mv_ptr = 0; /* mark the current strip as INTRA */
800 2373 curr_cell.tree = 1; /* enter the VQ tree */
801 } else { /* VQ tree NULL code */
802
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 456 RESYNC_BITSTREAM;
803 456 code = get_bits(&ctx->gb, 2);
804
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 456 if (code >= 2) {
805 ✗ av_log(avctx, AV_LOG_ERROR, "Invalid VQ_NULL code: %d\n", code);
806 ✗ return AVERROR_INVALIDDATA;
807 }
808
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 456 if (code == 1)
809 ✗ av_log(avctx, AV_LOG_ERROR, "SkipCell procedure not implemented yet!\n");
810
811
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 456 CHECK_CELL
812
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 456 if (!curr_cell.mv_ptr)
813 ✗ return AVERROR_INVALIDDATA;
814
815 456 ret = copy_cell(ctx, plane, &curr_cell);
816 456 return ret;
817 }
818 2373 break;
819 19180 case INTER_DATA:
820
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 19180 if (!curr_cell.tree) { /* MC tree INTER code */
821 unsigned mv_idx;
822 /* get motion vector index and setup the pointer to the mv set */
823
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 3236 if (!ctx->need_resync)
824 1544 ctx->next_cell_data = &ctx->gb.buffer[(get_bits_count(&ctx->gb) + 7) >> 3];
825
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 3236 if (ctx->next_cell_data >= ctx->last_byte) {
826 ✗ av_log(avctx, AV_LOG_ERROR, "motion vector out of array\n");
827 ✗ return AVERROR_INVALIDDATA;
828 }
829 3236 mv_idx = *(ctx->next_cell_data++);
830
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 3236 if (mv_idx >= ctx->num_vectors) {
831 ✗ av_log(avctx, AV_LOG_ERROR, "motion vector index out of range\n");
832 ✗ return AVERROR_INVALIDDATA;
833 }
834 3236 curr_cell.mv_ptr = &ctx->mc_vectors[mv_idx << 1];
835 3236 curr_cell.tree = 1; /* enter the VQ tree */
836 3236 UPDATE_BITPOS(8);
837 } else { /* VQ tree DATA code */
838
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 15944 if (!ctx->need_resync)
839 7503 ctx->next_cell_data = &ctx->gb.buffer[(get_bits_count(&ctx->gb) + 7) >> 3];
840
841
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 15944 CHECK_CELL
842 15944 bytes_used = decode_cell(ctx, avctx, plane, &curr_cell,
843 ctx->next_cell_data, ctx->last_byte);
844
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 15944 if (bytes_used < 0)
845 ✗ return AVERROR_INVALIDDATA;
846
847 15944 UPDATE_BITPOS(bytes_used << 3);
848 15944 ctx->next_cell_data += bytes_used;
849 15944 return 0;
850 }
851 3236 break;
852 }
853 }//while
854
855 ✗ return AVERROR_INVALIDDATA;
856 }
857
858
859 420 static int decode_plane(Indeo3DecodeContext *ctx, AVCodecContext *avctx,
860 Plane *plane, const uint8_t *data, int32_t data_size,
861 int32_t strip_width)
862 {
863 Cell curr_cell;
864 unsigned num_vectors;
865
866 /* each plane data starts with mc_vector_count field, */
867 /* an optional array of motion vectors followed by the vq data */
868 420 num_vectors = bytestream_get_le32(&data); data_size -= 4;
869
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 420 if (num_vectors > 256) {
870 ✗ av_log(ctx->avctx, AV_LOG_ERROR,
871 "Read invalid number of motion vectors %d\n", num_vectors);
872 ✗ return AVERROR_INVALIDDATA;
873 }
874
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 420 if (num_vectors * 2 > data_size)
875 ✗ return AVERROR_INVALIDDATA;
876
877 420 ctx->num_vectors = num_vectors;
878
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 420 ctx->mc_vectors = num_vectors ? data : 0;
879
880 /* init the bitreader */
881 420 init_get_bits(&ctx->gb, &data[num_vectors * 2], (data_size - num_vectors * 2) << 3);
882 420 ctx->skip_bits = 0;
883 420 ctx->need_resync = 0;
884
885 420 ctx->last_byte = data + data_size;
886
887 /* initialize the 1st cell and set its dimensions to whole plane */
888 420 curr_cell.xpos = curr_cell.ypos = 0;
889 420 curr_cell.width = plane->width >> 2;
890 420 curr_cell.height = plane->height >> 2;
891 420 curr_cell.tree = 0; // we are in the MC tree now
892 420 curr_cell.mv_ptr = 0; // no motion vector = INTRA cell
893
894 420 return parse_bintree(ctx, avctx, plane, INTRA_NULL, &curr_cell, CELL_STACK_MAX, strip_width);
895 }
896
897
898 #define OS_HDR_ID MKBETAG('F', 'R', 'M', 'H')
899
900 140 static int decode_frame_headers(Indeo3DecodeContext *ctx, AVCodecContext *avctx,
901 const uint8_t *buf, int buf_size)
902 {
903 GetByteContext gb;
904 const uint8_t *bs_hdr;
905 uint32_t frame_num, word2, check_sum, data_size;
906 int y_offset, u_offset, v_offset;
907 uint32_t starts[3], ends[3];
908 uint16_t height, width;
909 int i, j;
910
911 140 bytestream2_init(&gb, buf, buf_size);
912
913 /* parse and check the OS header */
914 140 frame_num = bytestream2_get_le32(&gb);
915 140 word2 = bytestream2_get_le32(&gb);
916 140 check_sum = bytestream2_get_le32(&gb);
917 140 data_size = bytestream2_get_le32(&gb);
918
919
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 140 if ((frame_num ^ word2 ^ data_size ^ OS_HDR_ID) != check_sum) {
920 ✗ av_log(avctx, AV_LOG_ERROR, "OS header checksum mismatch!\n");
921 ✗ return AVERROR_INVALIDDATA;
922 }
923
924 /* parse the bitstream header */
925 140 bs_hdr = gb.buffer;
926
927
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 140 if (bytestream2_get_le16(&gb) != 32) {
928 ✗ av_log(avctx, AV_LOG_ERROR, "Unsupported codec version!\n");
929 ✗ return AVERROR_INVALIDDATA;
930 }
931
932 140 ctx->frame_num = frame_num;
933 140 ctx->frame_flags = bytestream2_get_le16(&gb);
934 140 ctx->data_size = (bytestream2_get_le32(&gb) + 7) >> 3;
935 140 ctx->cb_offset = bytestream2_get_byte(&gb);
936
937
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 140 if (ctx->data_size == 16)
938 ✗ return 4;
939
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 140 ctx->data_size = FFMIN(ctx->data_size, buf_size - 16);
940
941 140 bytestream2_skip(&gb, 3); // skip reserved byte and checksum
942
943 /* check frame dimensions */
944 140 height = bytestream2_get_le16(&gb);
945 140 width = bytestream2_get_le16(&gb);
946
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 140 if (av_image_check_size(width, height, 0, avctx))
947 ✗ return AVERROR_INVALIDDATA;
948
949
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 140 if (width != ctx->width || height != ctx->height) {
950 int res;
951
952 ff_dlog(avctx, "Frame dimensions changed!\n");
953
954 ✗ if (width < 16 || width > 640 ||
955 ✗ height < 16 || height > 480 ||
956 ✗ width & 3 || height & 3) {
957 ✗ av_log(avctx, AV_LOG_ERROR,
958 "Invalid picture dimensions: %d x %d!\n", width, height);
959 ✗ return AVERROR_INVALIDDATA;
960 }
961 ✗ free_frame_buffers(ctx);
962 ✗ if ((res = allocate_frame_buffers(ctx, avctx, width, height)) < 0)
963 ✗ return res;
964 ✗ if ((res = ff_set_dimensions(avctx, width, height)) < 0)
965 ✗ return res;
966 }
967
968 140 y_offset = bytestream2_get_le32(&gb);
969 140 v_offset = bytestream2_get_le32(&gb);
970 140 u_offset = bytestream2_get_le32(&gb);
971 140 bytestream2_skip(&gb, 4);
972
973 /* unfortunately there is no common order of planes in the buffer */
974 /* so we use that sorting algo for determining planes data sizes */
975 140 starts[0] = y_offset;
976 140 starts[1] = v_offset;
977 140 starts[2] = u_offset;
978
979
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 560 for (j = 0; j < 3; j++) {
980 420 ends[j] = ctx->data_size;
981
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 1680 for (i = 2; i >= 0; i--)
982
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 1260 if (starts[i] < ends[j] && starts[i] > starts[j])
983 280 ends[j] = starts[i];
984 }
985
986 140 ctx->y_data_size = ends[0] - starts[0];
987 140 ctx->v_data_size = ends[1] - starts[1];
988 140 ctx->u_data_size = ends[2] - starts[2];
989
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 140 if (FFMIN3(y_offset, v_offset, u_offset) < 0 ||
990
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 140 FFMAX3(y_offset, v_offset, u_offset) >= ctx->data_size - 16 ||
991
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 140 FFMIN3(y_offset, v_offset, u_offset) < gb.buffer - bs_hdr + 16 ||
992
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 140 FFMIN3(ctx->y_data_size, ctx->v_data_size, ctx->u_data_size) <= 0) {
993 ✗ av_log(avctx, AV_LOG_ERROR, "One of the y/u/v offsets is invalid\n");
994 ✗ return AVERROR_INVALIDDATA;
995 }
996
997 140 ctx->y_data_ptr = bs_hdr + y_offset;
998 140 ctx->v_data_ptr = bs_hdr + v_offset;
999 140 ctx->u_data_ptr = bs_hdr + u_offset;
1000 140 ctx->alt_quant = gb.buffer;
1001
1002
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 140 if (ctx->data_size == 16) {
1003 ✗ av_log(avctx, AV_LOG_DEBUG, "Sync frame encountered!\n");
1004 ✗ return 16;
1005 }
1006
1007
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 140 if (ctx->frame_flags & BS_8BIT_PEL) {
1008 ✗ avpriv_request_sample(avctx, "8-bit pixel format");
1009 ✗ return AVERROR_PATCHWELCOME;
1010 }
1011
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 140 if (ctx->frame_flags & BS_MV_X_HALF || ctx->frame_flags & BS_MV_Y_HALF) {
1013 ✗ avpriv_request_sample(avctx, "Halfpel motion vectors");
1014 ✗ return AVERROR_PATCHWELCOME;
1015 }
1016
1017 140 return 0;
1018 }
1019
1020
1021 /**
1022 * Convert and output the current plane.
1023 * All pixel values will be upsampled by shifting right by one bit.
1024 *
1025 * @param[in] plane pointer to the descriptor of the plane being processed
1026 * @param[in] buf_sel indicates which frame buffer the input data stored in
1027 * @param[out] dst pointer to the buffer receiving converted pixels
1028 * @param[in] dst_pitch pitch for moving to the next y line
1029 * @param[in] dst_height output plane height
1030 */
1031 420 static void output_plane(const Plane *plane, int buf_sel, uint8_t *dst,
1032 ptrdiff_t dst_pitch, int dst_height)
1033 {
1034 int x,y;
1035 420 const uint8_t *src = plane->pixels[buf_sel];
1036 420 ptrdiff_t pitch = plane->pitch;
1037
1038 420 dst_height = FFMIN(dst_height, plane->height);
1039
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 35820 for (y = 0; y < dst_height; y++) {
1040 /* convert four pixels at once using SWAR */
1041
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 1943400 for (x = 0; x < plane->width >> 2; x++) {
1042 1908000 AV_WN32A(dst, (AV_RN32A(src) & 0x7F7F7F7F) << 1);
1043 1908000 src += 4;
1044 1908000 dst += 4;
1045 }
1046
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 35400 for (x <<= 2; x < plane->width; x++)
1048 ✗ *dst++ = *src++ << 1;
1049
1050 35400 src += pitch - plane->width;
1051 35400 dst += dst_pitch - plane->width;
1052 }
1053 420 }
1054
1055
1056 4 static av_cold int decode_init(AVCodecContext *avctx)
1057 {
1058 static AVOnce init_static_once = AV_ONCE_INIT;
1059 4 Indeo3DecodeContext *ctx = avctx->priv_data;
1060
1061 4 ctx->avctx = avctx;
1062 4 avctx->pix_fmt = AV_PIX_FMT_YUV410P;
1063
1064 4 ff_thread_once(&init_static_once, build_requant_tab);
1065
1066 4 ff_hpeldsp_init(&ctx->hdsp, avctx->flags);
1067
1068 4 return allocate_frame_buffers(ctx, avctx, avctx->width, avctx->height);
1069 }
1070
1071
1072 140 static int decode_frame(AVCodecContext *avctx, AVFrame *frame,
1073 int *got_frame, AVPacket *avpkt)
1074 {
1075 140 Indeo3DecodeContext *ctx = avctx->priv_data;
1076 140 const uint8_t *buf = avpkt->data;
1077 140 int buf_size = avpkt->size;
1078 int res;
1079
1080 140 res = decode_frame_headers(ctx, avctx, buf, buf_size);
1081
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 140 if (res < 0)
1082 ✗ return res;
1083
1084 /* skip sync(null) frames */
1085
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 140 if (res) {
1086 // we have processed 16 bytes but no data was decoded
1087 ✗ *got_frame = 0;
1088 ✗ return buf_size;
1089 }
1090
1091 /* skip droppable INTER frames if requested */
1092
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 140 if (ctx->frame_flags & BS_NONREF &&
1093
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 32 (avctx->skip_frame >= AVDISCARD_NONREF))
1094 ✗ return 0;
1095
1096 /* skip INTER frames if requested */
1097
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 140 if (!(ctx->frame_flags & BS_KEYFRAME) && avctx->skip_frame >= AVDISCARD_NONKEY)
1098 ✗ return 0;
1099
1100 /* use BS_BUFFER flag for buffer switching */
1101 140 ctx->buf_sel = (ctx->frame_flags >> BS_BUFFER) & 1;
1102
1103
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 140 if ((res = ff_get_buffer(avctx, frame, 0)) < 0)
1104 ✗ return res;
1105
1106 /* decode luma plane */
1107
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 140 if ((res = decode_plane(ctx, avctx, ctx->planes, ctx->y_data_ptr, ctx->y_data_size, 40)))
1108 ✗ return res;
1109
1110 /* decode chroma planes */
1111
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 140 if ((res = decode_plane(ctx, avctx, &ctx->planes[1], ctx->u_data_ptr, ctx->u_data_size, 10)))
1112 ✗ return res;
1113
1114
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 140 if ((res = decode_plane(ctx, avctx, &ctx->planes[2], ctx->v_data_ptr, ctx->v_data_size, 10)))
1115 ✗ return res;
1116
1117 140 output_plane(&ctx->planes[0], ctx->buf_sel,
1118 140 frame->data[0], frame->linesize[0],
1119 avctx->height);
1120 140 output_plane(&ctx->planes[1], ctx->buf_sel,
1121 140 frame->data[1], frame->linesize[1],
1122 140 (avctx->height + 3) >> 2);
1123 140 output_plane(&ctx->planes[2], ctx->buf_sel,
1124 140 frame->data[2], frame->linesize[2],
1125 140 (avctx->height + 3) >> 2);
1126
1127 140 *got_frame = 1;
1128
1129 140 return buf_size;
1130 }
1131
1132
1133 4 static av_cold int decode_close(AVCodecContext *avctx)
1134 {
1135 4 free_frame_buffers(avctx->priv_data);
1136
1137 4 return 0;
1138 }
1139
1140 const FFCodec ff_indeo3_decoder = {
1141 .p.name = "indeo3",
1142 CODEC_LONG_NAME("Intel Indeo 3"),
1143 .p.type = AVMEDIA_TYPE_VIDEO,
1144 .p.id = AV_CODEC_ID_INDEO3,
1145 .priv_data_size = sizeof(Indeo3DecodeContext),
1146 .init = decode_init,
1147 .close = decode_close,
1148 FF_CODEC_DECODE_CB(decode_frame),
1149 .p.capabilities = AV_CODEC_CAP_DR1,
1150 .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
1151 };
1152