FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/flac_parser.c
Date: 2024-07-17 14:05:47
Exec Total Coverage
Lines: 362 422 85.8%
Functions: 21 21 100.0%
Branches: 209 286 73.1%

Line Branch Exec Source
1 /*
2 * FLAC parser
3 * Copyright (c) 2010 Michael Chinen
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 * FLAC parser
25 *
26 * The FLAC parser buffers input until FLAC_MIN_HEADERS has been found.
27 * Each time it finds and verifies a CRC-8 header it sees which of the
28 * FLAC_MAX_SEQUENTIAL_HEADERS that came before it have a valid CRC-16 footer
29 * that ends at the newly found header.
30 * Headers are scored by FLAC_HEADER_BASE_SCORE plus the max of its crc-verified
31 * children, penalized by changes in sample rate, frame number, etc.
32 * The parser returns the frame with the highest score.
33 **/
34
35 #include "libavutil/attributes.h"
36 #include "libavutil/crc.h"
37 #include "libavutil/mem.h"
38 #include "flac_parse.h"
39
40 /** maximum number of adjacent headers that compare CRCs against each other */
41 #define FLAC_MAX_SEQUENTIAL_HEADERS 4
42 /** minimum number of headers buffered and checked before returning frames */
43 #define FLAC_MIN_HEADERS 10
44 /** estimate for average size of a FLAC frame */
45 #define FLAC_AVG_FRAME_SIZE 8192
46
47 /** scoring settings for score_header */
48 #define FLAC_HEADER_BASE_SCORE 10
49 #define FLAC_HEADER_CHANGED_PENALTY 7
50 #define FLAC_HEADER_CRC_FAIL_PENALTY 50
51 #define FLAC_HEADER_NOT_PENALIZED_YET 100000
52 #define FLAC_HEADER_NOT_SCORED_YET -100000
53
54 /** largest possible size of flac header */
55 #define MAX_FRAME_HEADER_SIZE 16
56 #define MAX_FRAME_VERIFY_SIZE (MAX_FRAME_HEADER_SIZE + 1)
57
58 typedef struct FifoBuffer {
59 uint8_t *buffer;
60 uint8_t *end;
61 uint8_t *rptr;
62 uint8_t *wptr;
63 int empty;
64 } FifoBuffer;
65
66 typedef struct FLACHeaderMarker {
67 int offset; /**< byte offset from start of FLACParseContext->buffer */
68 int link_penalty[FLAC_MAX_SEQUENTIAL_HEADERS]; /**< array of local scores
69 between this header and the one at a distance equal
70 array position */
71 int max_score; /**< maximum score found after checking each child that
72 has a valid CRC */
73 FLACFrameInfo fi; /**< decoded frame header info */
74 struct FLACHeaderMarker *next; /**< next CRC-8 verified header that
75 immediately follows this one in
76 the bytestream */
77 struct FLACHeaderMarker *best_child; /**< following frame header with
78 which this frame has the best
79 score with */
80 } FLACHeaderMarker;
81
82 typedef struct FLACParseContext {
83 AVCodecParserContext *pc; /**< parent context */
84 AVCodecContext *avctx; /**< codec context pointer for logging */
85 FLACHeaderMarker *headers; /**< linked-list that starts at the first
86 CRC-8 verified header within buffer */
87 FLACHeaderMarker *best_header; /**< highest scoring header within buffer */
88 int nb_headers_found; /**< number of headers found in the last
89 flac_parse() call */
90 int nb_headers_buffered; /**< number of headers that are buffered */
91 int best_header_valid; /**< flag set when the parser returns junk;
92 if set return best_header next time */
93 FifoBuffer fifo_buf; /**< buffer to store all data until headers
94 can be verified */
95 int end_padded; /**< specifies if fifo_buf's end is padded */
96 uint8_t *wrap_buf; /**< general fifo read buffer when wrapped */
97 int wrap_buf_allocated_size; /**< actual allocated size of the buffer */
98 FLACFrameInfo last_fi; /**< last decoded frame header info */
99 int last_fi_valid; /**< set if last_fi is valid */
100 } FLACParseContext;
101
102 5222 static int frame_header_is_valid(AVCodecContext *avctx, const uint8_t *buf,
103 FLACFrameInfo *fi)
104 {
105 GetBitContext gb;
106 uint8_t subframe_type;
107
108 // header plus one byte from first subframe
109 5222 init_get_bits(&gb, buf, MAX_FRAME_VERIFY_SIZE * 8);
110
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5222 if (ff_flac_decode_frame_header(avctx, &gb, fi, 127)) {
111 911 return 0;
112 }
113 // subframe zero bit
114
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4311 if (get_bits1(&gb) != 0) {
115 return 0;
116 }
117 // subframe type
118 // 000000 : SUBFRAME_CONSTANT
119 // 000001 : SUBFRAME_VERBATIM
120 // 00001x : reserved
121 // 0001xx : reserved
122 // 001xxx : if(xxx <= 4) SUBFRAME_FIXED, xxx=order ; else reserved
123 // 01xxxx : reserved
124 // 1xxxxx : SUBFRAME_LPC, xxxxx=order-1
125 4311 subframe_type = get_bits(&gb, 6);
126
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6501 if (!(subframe_type == 0 ||
127
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4173 subframe_type == 1 ||
128
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4173 ((subframe_type >= 8) && (subframe_type <= 12)) ||
129 (subframe_type >= 32))) {
130 return 0;
131 }
132
133 4311 return 1;
134 }
135
136 142292 static size_t flac_fifo_size(const FifoBuffer *f)
137 {
138
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142292 if (f->wptr <= f->rptr && !f->empty)
139 66060 return (f->wptr - f->buffer) + (f->end - f->rptr);
140 76232 return f->wptr - f->rptr;
141 }
142
143 68230 static size_t flac_fifo_space(const FifoBuffer *f)
144 {
145 68230 return f->end - f->buffer - flac_fifo_size(f);
146 }
147
148 /**
149 * Non-destructive fast fifo pointer fetching
150 * Returns a pointer from the specified offset.
151 * If possible the pointer points within the fifo buffer.
152 * Otherwise (if it would cause a wrap around,) a pointer to a user-specified
153 * buffer is used.
154 * The pointer can be NULL. In any case it will be reallocated to hold the size.
155 * If the returned pointer will be used after subsequent calls to flac_fifo_read_wrap
156 * then the subsequent calls should pass in a different wrap_buf so as to not
157 * overwrite the contents of the previous wrap_buf.
158 * This function is based on av_fifo_generic_read, which is why there is a comment
159 * about a memory barrier for SMP.
160 */
161 8122 static uint8_t *flac_fifo_read_wrap(FLACParseContext *fpc, int offset, int len,
162 uint8_t **wrap_buf, int *allocated_size)
163 {
164 8122 FifoBuffer *f = &fpc->fifo_buf;
165 8122 uint8_t *start = f->rptr + offset;
166 uint8_t *tmp_buf;
167
168
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8122 if (start >= f->end)
169 1610 start -= f->end - f->buffer;
170
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8122 if (f->end - start >= len)
171 7979 return start;
172
173 143 tmp_buf = av_fast_realloc(*wrap_buf, allocated_size, len);
174
175
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143 if (!tmp_buf) {
176 av_log(fpc->avctx, AV_LOG_ERROR,
177 "couldn't reallocate wrap buffer of size %d", len);
178 return NULL;
179 }
180 143 *wrap_buf = tmp_buf;
181 do {
182 286 int seg_len = FFMIN(f->end - start, len);
183 286 memcpy(tmp_buf, start, seg_len);
184 286 tmp_buf = (uint8_t*)tmp_buf + seg_len;
185 // memory barrier needed for SMP here in theory
186
187 286 start += seg_len - (f->end - f->buffer);
188 286 len -= seg_len;
189
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286 } while (len > 0);
190
191 143 return *wrap_buf;
192 }
193
194 /**
195 * Return a pointer in the fifo buffer where the offset starts at until
196 * the wrap point or end of request.
197 * len will contain the valid length of the returned buffer.
198 * A second call to flac_fifo_read (with new offset and len) should be called
199 * to get the post-wrap buf if the returned len is less than the requested.
200 **/
201 38546 static uint8_t *flac_fifo_read(FifoBuffer *f, int offset, int *len)
202 {
203 38546 uint8_t *start = f->rptr + offset;
204
205
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38546 if (start >= f->end)
206 17126 start -= f->end - f->buffer;
207 38546 *len = FFMIN(*len, f->end - start);
208 38546 return start;
209 }
210
211 26 static int flac_fifo_grow(FifoBuffer *f, size_t inc)
212 {
213 26 size_t size_old = f->end - f->buffer;
214 26 size_t offset_r = f->rptr - f->buffer;
215 26 size_t offset_w = f->wptr - f->buffer;
216 size_t size_new;
217
218 uint8_t *tmp;
219
220
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26 if (size_old > SIZE_MAX - inc)
221 return AVERROR(EINVAL);
222 26 size_new = size_old + inc;
223
224 26 tmp = av_realloc(f->buffer, size_new);
225
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26 if (!tmp)
226 return AVERROR(ENOMEM);
227
228 // move the data from the beginning of the ring buffer
229 // to the newly allocated space
230
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26 if (offset_w <= offset_r && !f->empty) {
231 17 const size_t copy = FFMIN(inc, offset_w);
232 17 memcpy(tmp + size_old, tmp, copy);
233
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17 if (copy < offset_w) {
234 memmove(tmp, tmp + copy, offset_w - copy);
235 offset_w -= copy;
236 } else
237 17 offset_w = size_old + copy;
238 }
239
240 26 f->buffer = tmp;
241 26 f->end = f->buffer + size_new;
242 26 f->rptr = f->buffer + offset_r;
243 26 f->wptr = f->buffer + offset_w;
244
245 26 return 0;
246 }
247
248 34115 static int flac_fifo_write(FifoBuffer *f, const uint8_t *src, size_t size)
249 {
250 uint8_t *wptr;
251
252
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34115 if (flac_fifo_space(f) < size) {
253
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26 int ret = flac_fifo_grow(f, FFMAX(flac_fifo_size(f), size));
254
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26 if (ret < 0)
255 return ret;
256 }
257
258
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34115 if (size)
259 34115 f->empty = 0;
260
261 34115 wptr = f->wptr;
262 do {
263 34268 size_t len = FFMIN(f->end - wptr, size);
264 34268 memcpy(wptr, src, len);
265 34268 src += len;
266 34268 wptr += len;
267
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34268 if (wptr >= f->end)
268 160 wptr = f->buffer;
269 34268 size -= len;
270
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34268 } while (size > 0);
271
272 34115 f->wptr = wptr;
273
274 34115 return 0;
275 }
276
277 2791 static void flac_fifo_drain(FifoBuffer *f, size_t size)
278 {
279 2791 size_t size_cur = flac_fifo_size(f);
280
281
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2791 av_assert0(size_cur >= size);
282
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2791 if (size_cur == size)
283 f->empty = 1;
284
285 2791 f->rptr += size;
286
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2791 if (f->rptr >= f->end)
287 143 f->rptr -= f->end - f->buffer;
288 2791 }
289
290 287 static int flac_fifo_alloc(FifoBuffer *f, size_t size)
291 {
292 287 memset(f, 0, sizeof(*f));
293
294 287 f->buffer = av_realloc(NULL, size);
295
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287 if (!f->buffer)
296 return AVERROR(ENOMEM);
297
298 287 f->wptr = f->buffer;
299 287 f->rptr = f->buffer;
300 287 f->end = f->buffer + size;
301
302 287 f->empty = 1;
303
304 287 return 0;
305 }
306
307 287 static void flac_fifo_free(FifoBuffer *f)
308 {
309 287 av_freep(&f->buffer);
310 287 memset(f, 0, sizeof(*f));
311 287 }
312
313 5083 static int find_headers_search_validate(FLACParseContext *fpc, int offset)
314 {
315 FLACFrameInfo fi;
316 uint8_t *header_buf;
317 5083 int size = 0;
318 5083 header_buf = flac_fifo_read_wrap(fpc, offset,
319 MAX_FRAME_VERIFY_SIZE + AV_INPUT_BUFFER_PADDING_SIZE,
320 &fpc->wrap_buf,
321 &fpc->wrap_buf_allocated_size);
322
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5083 if (frame_header_is_valid(fpc->avctx, header_buf, &fi)) {
323 4182 FLACHeaderMarker **end_handle = &fpc->headers;
324 int i;
325
326 4182 size = 0;
327
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34311 while (*end_handle) {
328 30129 end_handle = &(*end_handle)->next;
329 30129 size++;
330 }
331
332 4182 *end_handle = av_mallocz(sizeof(**end_handle));
333
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4182 if (!*end_handle) {
334 av_log(fpc->avctx, AV_LOG_ERROR,
335 "couldn't allocate FLACHeaderMarker\n");
336 return AVERROR(ENOMEM);
337 }
338 4182 (*end_handle)->fi = fi;
339 4182 (*end_handle)->offset = offset;
340
341
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20910 for (i = 0; i < FLAC_MAX_SEQUENTIAL_HEADERS; i++)
342 16728 (*end_handle)->link_penalty[i] = FLAC_HEADER_NOT_PENALIZED_YET;
343
344 4182 fpc->nb_headers_found++;
345 4182 size++;
346 }
347 5083 return size;
348 }
349
350 34273 static int find_headers_search(FLACParseContext *fpc, uint8_t *buf,
351 int buf_size, int search_start)
352 {
353 34273 int size = 0, mod_offset = (buf_size - 1) % 4, i, j;
354 uint32_t x;
355
356
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35043 for (i = 0; i < mod_offset; i++) {
357
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770 if ((AV_RB16(buf + i) & 0xFFFE) == 0xFFF8) {
358 66 int ret = find_headers_search_validate(fpc, search_start + i);
359 66 size = FFMAX(size, ret);
360 }
361 }
362
363
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8743923 for (; i < buf_size - 1; i += 4) {
364 8709650 x = AV_RN32(buf + i);
365
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8709650 if (((x & ~(x + 0x01010101)) & 0x80808080)) {
366
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609830 for (j = 0; j < 4; j++) {
367
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487864 if ((AV_RB16(buf + i + j) & 0xFFFE) == 0xFFF8) {
368 5017 int ret = find_headers_search_validate(fpc, search_start + i + j);
369 5017 size = FFMAX(size, ret);
370 }
371 }
372 }
373 }
374 34273 return size;
375 }
376
377 34115 static int find_new_headers(FLACParseContext *fpc, int search_start)
378 {
379 FLACHeaderMarker *end;
380 34115 int search_end, size = 0, read_len, temp;
381 uint8_t *buf;
382 34115 fpc->nb_headers_found = 0;
383
384 /* Search for a new header of at most 16 bytes. */
385 34115 search_end = flac_fifo_size(&fpc->fifo_buf) - (MAX_FRAME_HEADER_SIZE - 1);
386 34115 read_len = search_end - search_start + 1;
387 34115 buf = flac_fifo_read(&fpc->fifo_buf, search_start, &read_len);
388 34115 size = find_headers_search(fpc, buf, read_len, search_start);
389 34115 search_start += read_len - 1;
390
391 /* If fifo end was hit do the wrap around. */
392
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34115 if (search_start != search_end) {
393 uint8_t wrap[2];
394
395 158 wrap[0] = buf[read_len - 1];
396 /* search_start + 1 is the post-wrap offset in the fifo. */
397 158 read_len = search_end - (search_start + 1) + 1;
398
399 158 buf = flac_fifo_read(&fpc->fifo_buf, search_start + 1, &read_len);
400 158 wrap[1] = buf[0];
401
402
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158 if ((AV_RB16(wrap) & 0xFFFE) == 0xFFF8) {
403 temp = find_headers_search_validate(fpc, search_start);
404 size = FFMAX(size, temp);
405 }
406 158 search_start++;
407
408 /* Continue to do the last half of the wrap. */
409 158 temp = find_headers_search(fpc, buf, read_len, search_start);
410 158 size = FFMAX(size, temp);
411 158 search_start += read_len - 1;
412 }
413
414 /* Return the size even if no new headers were found. */
415
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34115 if (!size && fpc->headers)
416
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292476 for (end = fpc->headers; end; end = end->next)
417 262248 size++;
418 34115 return size;
419 }
420
421 43108 static int check_header_fi_mismatch(FLACParseContext *fpc,
422 FLACFrameInfo *header_fi,
423 FLACFrameInfo *child_fi,
424 int log_level_offset)
425 {
426 43108 int deduction = 0;
427
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43108 if (child_fi->samplerate != header_fi->samplerate) {
428 deduction += FLAC_HEADER_CHANGED_PENALTY;
429 av_log(fpc->avctx, AV_LOG_WARNING + log_level_offset,
430 "sample rate change detected in adjacent frames\n");
431 }
432
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43108 if (child_fi->bps != header_fi->bps) {
433 deduction += FLAC_HEADER_CHANGED_PENALTY;
434 av_log(fpc->avctx, AV_LOG_WARNING + log_level_offset,
435 "bits per sample change detected in adjacent frames\n");
436 }
437
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43108 if (child_fi->is_var_size != header_fi->is_var_size) {
438 /* Changing blocking strategy not allowed per the spec */
439 deduction += FLAC_HEADER_BASE_SCORE;
440 av_log(fpc->avctx, AV_LOG_WARNING + log_level_offset,
441 "blocking strategy change detected in adjacent frames\n");
442 }
443
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43108 if (child_fi->channels != header_fi->channels) {
444 deduction += FLAC_HEADER_CHANGED_PENALTY;
445 av_log(fpc->avctx, AV_LOG_WARNING + log_level_offset,
446 "number of channels change detected in adjacent frames\n");
447 }
448 43108 return deduction;
449 }
450
451 17883 static int check_header_mismatch(FLACParseContext *fpc,
452 FLACHeaderMarker *header,
453 FLACHeaderMarker *child,
454 int log_level_offset)
455 {
456 17883 FLACFrameInfo *header_fi = &header->fi, *child_fi = &child->fi;
457 17883 int check_crc, deduction, deduction_expected = 0, i;
458 17883 deduction = check_header_fi_mismatch(fpc, header_fi, child_fi,
459 log_level_offset);
460 /* Check sample and frame numbers. */
461 17883 if ((child_fi->frame_or_sample_num - header_fi->frame_or_sample_num
462
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17883 != header_fi->blocksize) &&
463 17883 (child_fi->frame_or_sample_num
464
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17883 != header_fi->frame_or_sample_num + 1)) {
465 FLACHeaderMarker *curr;
466 int64_t expected_frame_num, expected_sample_num;
467 /* If there are frames in the middle we expect this deduction,
468 as they are probably valid and this one follows it */
469
470 10989 expected_frame_num = expected_sample_num = header_fi->frame_or_sample_num;
471 10989 curr = header;
472
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43624 while (curr != child) {
473 /* Ignore frames that failed all crc checks */
474
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32635 for (i = 0; i < FLAC_MAX_SEQUENTIAL_HEADERS; i++) {
475
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32635 if (curr->link_penalty[i] < FLAC_HEADER_CRC_FAIL_PENALTY) {
476 32635 expected_frame_num++;
477 32635 expected_sample_num += curr->fi.blocksize;
478 32635 break;
479 }
480 }
481 32635 curr = curr->next;
482 }
483
484
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10989 if (expected_frame_num == child_fi->frame_or_sample_num ||
485 expected_sample_num == child_fi->frame_or_sample_num)
486 10989 deduction_expected = deduction ? 0 : 1;
487
488 10989 deduction += FLAC_HEADER_CHANGED_PENALTY;
489 10989 av_log(fpc->avctx, AV_LOG_WARNING + log_level_offset,
490 "sample/frame number mismatch in adjacent frames\n");
491 }
492
493
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17883 if (fpc->last_fi.is_var_size == header_fi->is_var_size) {
494
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17883 if (fpc->last_fi.is_var_size &&
495 fpc->last_fi.frame_or_sample_num + fpc->last_fi.blocksize == header_fi->frame_or_sample_num) {
496 check_crc = 0;
497
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17883 } else if (!fpc->last_fi.is_var_size &&
498
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17883 fpc->last_fi.frame_or_sample_num + 1 == header_fi->frame_or_sample_num) {
499 2897 check_crc = 0;
500 } else {
501
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14986 check_crc = !deduction && !deduction_expected;
502 }
503 } else {
504 check_crc = !deduction && !deduction_expected;
505 }
506
507 /* If we have suspicious headers, check the CRC between them */
508
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17883 if (check_crc || (deduction && !deduction_expected)) {
509 FLACHeaderMarker *curr;
510 int read_len;
511 uint8_t *buf;
512 4128 uint32_t crc = 1;
513 4128 int inverted_test = 0;
514
515 /* Since CRC is expensive only do it if we haven't yet.
516 This assumes a CRC penalty is greater than all other check penalties */
517 4128 curr = header->next;
518
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4128 for (i = 0; i < FLAC_MAX_SEQUENTIAL_HEADERS && curr != child; i++)
519 curr = curr->next;
520
521
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4128 av_assert0(i < FLAC_MAX_SEQUENTIAL_HEADERS);
522
523
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4128 if (header->link_penalty[i] < FLAC_HEADER_CRC_FAIL_PENALTY ||
524
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3959 header->link_penalty[i] == FLAC_HEADER_NOT_PENALIZED_YET) {
525 FLACHeaderMarker *start, *end;
526
527 /* Although overlapping chains are scored, the crc should never
528 have to be computed twice for a single byte. */
529 4128 start = header;
530 4128 end = child;
531
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4128 if (i > 0 &&
532 header->link_penalty[i - 1] >= FLAC_HEADER_CRC_FAIL_PENALTY) {
533 while (start->next != child)
534 start = start->next;
535 inverted_test = 1;
536
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4128 } else if (i > 0 &&
537 header->next->link_penalty[i-1] >=
538 FLAC_HEADER_CRC_FAIL_PENALTY ) {
539 end = header->next;
540 inverted_test = 1;
541 }
542
543 4128 read_len = end->offset - start->offset;
544 4128 buf = flac_fifo_read(&fpc->fifo_buf, start->offset, &read_len);
545 4128 crc = av_crc(av_crc_get_table(AV_CRC_16_ANSI), 0, buf, read_len);
546 4128 read_len = (end->offset - start->offset) - read_len;
547
548
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4128 if (read_len) {
549 145 buf = flac_fifo_read(&fpc->fifo_buf, end->offset - read_len, &read_len);
550 145 crc = av_crc(av_crc_get_table(AV_CRC_16_ANSI), crc, buf, read_len);
551 }
552 }
553
554
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4128 if (!crc ^ !inverted_test) {
555 deduction += FLAC_HEADER_CRC_FAIL_PENALTY;
556 av_log(fpc->avctx, AV_LOG_WARNING + log_level_offset,
557 "crc check failed from offset %i (frame %"PRId64") to %i (frame %"PRId64")\n",
558 header->offset, header_fi->frame_or_sample_num,
559 child->offset, child_fi->frame_or_sample_num);
560 }
561 }
562 17883 return deduction;
563 }
564
565 /**
566 * Score a header.
567 *
568 * Give FLAC_HEADER_BASE_SCORE points to a frame for existing.
569 * If it has children, (subsequent frames of which the preceding CRC footer
570 * validates against this one,) then take the maximum score of the children,
571 * with a penalty of FLAC_HEADER_CHANGED_PENALTY applied for each change to
572 * bps, sample rate, channels, but not decorrelation mode, or blocksize,
573 * because it can change often.
574 **/
575 107410 static int score_header(FLACParseContext *fpc, FLACHeaderMarker *header)
576 {
577 FLACHeaderMarker *child;
578 107410 int dist = 0;
579 int child_score;
580 107410 int base_score = FLAC_HEADER_BASE_SCORE;
581
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107410 if (header->max_score != FLAC_HEADER_NOT_SCORED_YET)
582 80539 return header->max_score;
583
584 /* Modify the base score with changes from the last output header */
585
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26871 if (fpc->last_fi_valid) {
586 /* Silence the log since this will be repeated if selected */
587 25225 base_score -= check_header_fi_mismatch(fpc, &fpc->last_fi, &header->fi,
588 AV_LOG_DEBUG);
589 }
590
591 26871 header->max_score = base_score;
592
593 /* Check and compute the children's scores. */
594 26871 child = header->next;
595
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107410 for (dist = 0; dist < FLAC_MAX_SEQUENTIAL_HEADERS && child; dist++) {
596 /* Look at the child's frame header info and penalize suspicious
597 changes between the headers. */
598
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80539 if (header->link_penalty[dist] == FLAC_HEADER_NOT_PENALIZED_YET) {
599 14993 header->link_penalty[dist] = check_header_mismatch(fpc, header,
600 child, AV_LOG_DEBUG);
601 }
602 80539 child_score = score_header(fpc, child) - header->link_penalty[dist];
603
604
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80539 if (FLAC_HEADER_BASE_SCORE + child_score > header->max_score) {
605 /* Keep the child because the frame scoring is dynamic. */
606 24172 header->best_child = child;
607 24172 header->max_score = base_score + child_score;
608 }
609 80539 child = child->next;
610 }
611
612 26871 return header->max_score;
613 }
614
615 2699 static void score_sequences(FLACParseContext *fpc)
616 {
617 FLACHeaderMarker *curr;
618 2699 int best_score = FLAC_HEADER_NOT_SCORED_YET;
619 /* First pass to clear all old scores. */
620
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29570 for (curr = fpc->headers; curr; curr = curr->next)
621 26871 curr->max_score = FLAC_HEADER_NOT_SCORED_YET;
622
623 /* Do a second pass to score them all. */
624
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29570 for (curr = fpc->headers; curr; curr = curr->next) {
625
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26871 if (score_header(fpc, curr) > best_score) {
626 2699 fpc->best_header = curr;
627 2699 best_score = curr->max_score;
628 }
629 }
630 2699 }
631
632 2927 static int get_best_header(FLACParseContext *fpc, const uint8_t **poutbuf,
633 int *poutbuf_size)
634 {
635 2927 FLACHeaderMarker *header = fpc->best_header;
636 2927 FLACHeaderMarker *child = header->best_child;
637
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2927 if (!child) {
638 37 *poutbuf_size = flac_fifo_size(&fpc->fifo_buf) - header->offset;
639 } else {
640 2890 *poutbuf_size = child->offset - header->offset;
641
642 /* If the child has suspicious changes, log them */
643 2890 check_header_mismatch(fpc, header, child, 0);
644 }
645
646 2927 ff_flac_set_channel_layout(fpc->avctx, header->fi.channels);
647
648 2927 fpc->avctx->sample_rate = header->fi.samplerate;
649 2927 fpc->pc->duration = header->fi.blocksize;
650 2927 *poutbuf = flac_fifo_read_wrap(fpc, header->offset, *poutbuf_size,
651 &fpc->wrap_buf,
652 &fpc->wrap_buf_allocated_size);
653
654
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2927 if (fpc->pc->flags & PARSER_FLAG_USE_CODEC_TS) {
655
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2927 if (header->fi.is_var_size)
656 fpc->pc->pts = header->fi.frame_or_sample_num;
657
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2927 else if (header->best_child)
658 2890 fpc->pc->pts = header->fi.frame_or_sample_num * header->fi.blocksize;
659 }
660
661 2927 fpc->best_header_valid = 0;
662 2927 fpc->last_fi_valid = 1;
663 2927 fpc->last_fi = header->fi;
664
665 /* Return the negative overread index so the client can compute pos.
666 This should be the amount overread to the beginning of the child */
667
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2927 if (child) {
668 2890 int64_t offset = child->offset - flac_fifo_size(&fpc->fifo_buf);
669
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2890 if (offset > -(1 << 28))
670 2890 return offset;
671 }
672 37 return 0;
673 }
674
675 37190 static int flac_parse(AVCodecParserContext *s, AVCodecContext *avctx,
676 const uint8_t **poutbuf, int *poutbuf_size,
677 const uint8_t *buf, int buf_size)
678 {
679 37190 FLACParseContext *fpc = s->priv_data;
680 FLACHeaderMarker *curr;
681 int nb_headers;
682 37190 const uint8_t *read_end = buf;
683 37190 const uint8_t *read_start = buf;
684
685
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37190 if (s->flags & PARSER_FLAG_COMPLETE_FRAMES) {
686 FLACFrameInfo fi;
687
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139 if (frame_header_is_valid(avctx, buf, &fi)) {
688 129 s->duration = fi.blocksize;
689
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129 if (!avctx->sample_rate)
690 avctx->sample_rate = fi.samplerate;
691
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129 if (fpc->pc->flags & PARSER_FLAG_USE_CODEC_TS) {
692 fpc->pc->pts = fi.frame_or_sample_num;
693 if (!fi.is_var_size)
694 fpc->pc->pts *= fi.blocksize;
695 }
696 }
697 139 *poutbuf = buf;
698 139 *poutbuf_size = buf_size;
699 139 return buf_size;
700 }
701
702 37051 fpc->avctx = avctx;
703
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37051 if (fpc->best_header_valid && fpc->nb_headers_buffered >= FLAC_MIN_HEADERS)
704 2638 return get_best_header(fpc, poutbuf, poutbuf_size);
705
706 /* If a best_header was found last call remove it with the buffer data. */
707
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34413 if (fpc->best_header && fpc->best_header->best_child) {
708 FLACHeaderMarker *temp;
709 2791 FLACHeaderMarker *best_child = fpc->best_header->best_child;
710
711 /* Remove headers in list until the end of the best_header. */
712
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5582 for (curr = fpc->headers; curr != best_child; curr = temp) {
713
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2791 if (curr != fpc->best_header) {
714 av_log(avctx, AV_LOG_DEBUG,
715 "dropping low score %i frame header from offset %i to %i\n",
716 curr->max_score, curr->offset, curr->next->offset);
717 }
718 2791 temp = curr->next;
719 2791 av_free(curr);
720 2791 fpc->nb_headers_buffered--;
721 }
722 /* Release returned data from ring buffer. */
723 2791 flac_fifo_drain(&fpc->fifo_buf, best_child->offset);
724
725 /* Fix the offset for the headers remaining to match the new buffer. */
726
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24068 for (curr = best_child->next; curr; curr = curr->next)
727 21277 curr->offset -= best_child->offset;
728
729 2791 best_child->offset = 0;
730 2791 fpc->headers = best_child;
731
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2791 if (fpc->nb_headers_buffered >= FLAC_MIN_HEADERS) {
732 29 fpc->best_header = best_child;
733 29 return get_best_header(fpc, poutbuf, poutbuf_size);
734 }
735 2762 fpc->best_header = NULL;
736
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31622 } else if (fpc->best_header) {
737 /* No end frame no need to delete the buffer; probably eof */
738 FLACHeaderMarker *temp;
739
740
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40 for (curr = fpc->headers; curr != fpc->best_header; curr = temp) {
741 temp = curr->next;
742 av_free(curr);
743 fpc->nb_headers_buffered--;
744 }
745 40 fpc->headers = fpc->best_header->next;
746 40 av_freep(&fpc->best_header);
747 40 fpc->nb_headers_buffered--;
748 }
749
750 /* Find and score new headers. */
751 /* buf_size is zero when flushing, so check for this since we do */
752 /* not want to try to read more input once we have found the end. */
753 /* Also note that buf can't be NULL. */
754
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71106 while ((buf_size && read_end < buf + buf_size &&
755
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34069 fpc->nb_headers_buffered < FLAC_MIN_HEADERS)
756
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39736 || (!buf_size && !fpc->end_padded)) {
757 int start_offset, ret;
758
759 /* Pad the end once if EOF, to check the final region for headers. */
760
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34115 if (!buf_size) {
761 46 fpc->end_padded = 1;
762 46 read_end = read_start + MAX_FRAME_HEADER_SIZE;
763 } else {
764 /* The maximum read size is the upper-bound of what the parser
765 needs to have the required number of frames buffered */
766 34069 int nb_desired = FLAC_MIN_HEADERS - fpc->nb_headers_buffered + 1;
767
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34069 read_end = read_end + FFMIN(buf + buf_size - read_end,
768 nb_desired * FLAC_AVG_FRAME_SIZE);
769 }
770
771
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34115 if (!flac_fifo_space(&fpc->fifo_buf) &&
772 1 flac_fifo_size(&fpc->fifo_buf) / FLAC_AVG_FRAME_SIZE >
773
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1 fpc->nb_headers_buffered * 20) {
774 /* There is less than one valid flac header buffered for 20 headers
775 * buffered. Therefore the fifo is most likely filled with invalid
776 * data and the input is not a flac file. */
777 goto handle_error;
778 }
779
780 /* Fill the buffer. */
781
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34115 if (buf_size) {
782 34069 ret = flac_fifo_write(&fpc->fifo_buf, read_start,
783 34069 read_end - read_start);
784 } else {
785 46 int8_t pad[MAX_FRAME_HEADER_SIZE] = { 0 };
786 46 ret = flac_fifo_write(&fpc->fifo_buf, pad, sizeof(pad));
787 }
788
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34115 if (ret < 0) {
789 av_log(avctx, AV_LOG_ERROR, "Error buffering data\n");
790 goto handle_error;
791 }
792
793 /* Tag headers and update sequences. */
794 34115 start_offset = flac_fifo_size(&fpc->fifo_buf) -
795 34115 ((read_end - read_start) + (MAX_FRAME_HEADER_SIZE - 1));
796 34115 start_offset = FFMAX(0, start_offset);
797 34115 nb_headers = find_new_headers(fpc, start_offset);
798
799
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34115 if (nb_headers < 0) {
800 av_log(avctx, AV_LOG_ERROR,
801 "find_new_headers couldn't allocate FLAC header\n");
802 goto handle_error;
803 }
804
805 34115 fpc->nb_headers_buffered = nb_headers;
806 /* Wait till FLAC_MIN_HEADERS to output a valid frame. */
807
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34115 if (!fpc->end_padded && fpc->nb_headers_buffered < FLAC_MIN_HEADERS) {
808
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31416 if (read_end < buf + buf_size) {
809 read_start = read_end;
810 continue;
811 } else {
812 31416 goto handle_error;
813 }
814 }
815
816 /* If headers found, update the scores since we have longer chains. */
817
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2699 if (fpc->end_padded || fpc->nb_headers_found)
818 2699 score_sequences(fpc);
819
820 /* restore the state pre-padding */
821
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2699 if (fpc->end_padded) {
822 46 int empty = flac_fifo_size(&fpc->fifo_buf) == MAX_FRAME_HEADER_SIZE;
823 46 int warp = fpc->fifo_buf.wptr - fpc->fifo_buf.buffer < MAX_FRAME_HEADER_SIZE;
824 /* HACK: drain the tail of the fifo */
825 46 fpc->fifo_buf.wptr -= MAX_FRAME_HEADER_SIZE;
826
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46 if (warp) {
827 fpc->fifo_buf.wptr += fpc->fifo_buf.end -
828 fpc->fifo_buf.buffer;
829 }
830 46 fpc->fifo_buf.empty = empty;
831 46 read_start = read_end = NULL;
832 }
833 }
834
835
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30820 for (curr = fpc->headers; curr; curr = curr->next) {
836
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27852 if (!fpc->best_header || curr->max_score > fpc->best_header->max_score) {
837 229 fpc->best_header = curr;
838 }
839 }
840
841
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2968 if (fpc->best_header && fpc->best_header->max_score <= 0) {
842 // Only accept a bad header if there is no other option to continue
843 if (!buf_size || read_end != buf || fpc->nb_headers_buffered < FLAC_MIN_HEADERS)
844 fpc->best_header = NULL;
845 }
846
847
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2968 if (fpc->best_header) {
848 2928 fpc->best_header_valid = 1;
849
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2928 if (fpc->best_header->offset > 0) {
850 /* Output a junk frame. */
851 112 av_log(avctx, AV_LOG_DEBUG, "Junk frame till offset %i\n",
852 112 fpc->best_header->offset);
853
854 /* Set duration to 0. It is unknown or invalid in a junk frame. */
855 112 s->duration = 0;
856 112 *poutbuf_size = fpc->best_header->offset;
857 112 *poutbuf = flac_fifo_read_wrap(fpc, 0, *poutbuf_size,
858 &fpc->wrap_buf,
859 &fpc->wrap_buf_allocated_size);
860
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127 return buf_size ? (read_end - buf) : (fpc->best_header->offset -
861 15 flac_fifo_size(&fpc->fifo_buf));
862 }
863
2/2
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2816 if (!buf_size)
864 260 return get_best_header(fpc, poutbuf, poutbuf_size);
865 }
866
867 2596 handle_error:
868 34012 *poutbuf = NULL;
869 34012 *poutbuf_size = 0;
870
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34012 return buf_size ? read_end - buf : 0;
871 }
872
873 287 static av_cold int flac_parse_init(AVCodecParserContext *c)
874 {
875 287 FLACParseContext *fpc = c->priv_data;
876 int ret;
877
878 287 fpc->pc = c;
879 /* There will generally be FLAC_MIN_HEADERS buffered in the fifo before
880 it drains. This is allocated early to avoid slow reallocation. */
881 287 ret = flac_fifo_alloc(&fpc->fifo_buf, (FLAC_MIN_HEADERS + 3) * FLAC_AVG_FRAME_SIZE);
882
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287 if (ret < 0) {
883 av_log(fpc->avctx, AV_LOG_ERROR,
884 "couldn't allocate fifo_buf\n");
885 return AVERROR(ENOMEM);
886 }
887 287 return 0;
888 }
889
890 287 static void flac_parse_close(AVCodecParserContext *c)
891 {
892 287 FLACParseContext *fpc = c->priv_data;
893 287 FLACHeaderMarker *curr = fpc->headers, *temp;
894
895
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1638 while (curr) {
896 1351 temp = curr->next;
897 1351 av_free(curr);
898 1351 curr = temp;
899 }
900 287 fpc->headers = NULL;
901 287 flac_fifo_free(&fpc->fifo_buf);
902 287 av_freep(&fpc->wrap_buf);
903 287 }
904
905 const AVCodecParser ff_flac_parser = {
906 .codec_ids = { AV_CODEC_ID_FLAC },
907 .priv_data_size = sizeof(FLACParseContext),
908 .parser_init = flac_parse_init,
909 .parser_parse = flac_parse,
910 .parser_close = flac_parse_close,
911 };
912