43 #define FLAC_MAX_SEQUENTIAL_HEADERS 3
45 #define FLAC_MIN_HEADERS 10
47 #define FLAC_AVG_FRAME_SIZE 8192
50 #define FLAC_HEADER_BASE_SCORE 10
51 #define FLAC_HEADER_CHANGED_PENALTY 7
52 #define FLAC_HEADER_CRC_FAIL_PENALTY 50
53 #define FLAC_HEADER_NOT_PENALIZED_YET 100000
54 #define FLAC_HEADER_NOT_SCORED_YET -100000
57 #define MAX_FRAME_HEADER_SIZE 16
114 uint8_t** wrap_buf,
int* allocated_size)
122 if (f->
end - start >= len)
129 "couldn't reallocate wrap buffer of size %d", len);
134 int seg_len =
FFMIN(f->
end - start, len);
135 memcpy(tmp_buf, start, seg_len);
136 tmp_buf = (
uint8_t*)tmp_buf + seg_len;
178 while (*end_handle) {
179 end_handle = &(*end_handle)->
next;
186 "couldn't allocate FLACHeaderMarker\n");
189 (*end_handle)->fi = fi;
190 (*end_handle)->offset = offset;
191 (*end_handle)->link_penalty =
av_malloc(
sizeof(
int) *
206 int size = 0, mod_offset = (buf_size - 1) % 4, i, j;
209 for (i = 0; i < mod_offset; i++) {
210 if ((
AV_RB16(buf + i) & 0xFFFE) == 0xFFF8)
214 for (; i < buf_size - 1; i += 4) {
216 if (((x & ~(x + 0x01010101)) & 0x80808080)) {
217 for (j = 0; j < 4; j++) {
218 if ((
AV_RB16(buf + i + j) & 0xFFFE) == 0xFFF8)
229 int search_end,
size = 0, read_len, temp;
235 read_len = search_end - search_start + 1;
238 search_start += read_len - 1;
241 if (search_start != search_end) {
244 wrap[0] = buf[read_len - 1];
245 read_len = search_end - search_start + 1;
251 if ((
AV_RB16(wrap) & 0xFFFE) == 0xFFF8) {
253 size =
FFMAX(size, temp);
259 size =
FFMAX(size, temp);
260 search_start += read_len - 1;
273 int log_level_offset)
276 int deduction = 0, deduction_expected = 0, i;
277 if (child_fi->samplerate != header_fi->samplerate) {
280 "sample rate change detected in adjacent frames\n");
282 if (child_fi->bps != header_fi->bps) {
285 "bits per sample change detected in adjacent frames\n");
287 if (child_fi->is_var_size != header_fi->
is_var_size) {
291 "blocking strategy change detected in adjacent frames\n");
293 if (child_fi->channels != header_fi->channels) {
296 "number of channels change detected in adjacent frames\n");
301 (child_fi->frame_or_sample_num
304 int expected_frame_num, expected_sample_num;
310 while (curr != child) {
314 expected_frame_num++;
322 if (expected_frame_num == child_fi->frame_or_sample_num ||
323 expected_sample_num == child_fi->frame_or_sample_num)
324 deduction_expected = deduction ? 0 : 1;
328 "sample/frame number mismatch in adjacent frames\n");
332 if (deduction && !deduction_expected) {
337 int inverted_test = 0;
355 while (start->
next != child)
376 if (!crc ^ !inverted_test) {
379 "crc check failed from offset %i (frame %"PRId64
") to %i (frame %"PRId64
")\n",
381 child->
offset, child_fi->frame_or_sample_num);
409 child = header->
next;
439 for (curr = fpc->
headers; curr; curr = curr->
next) {
481 const uint8_t **poutbuf,
int *poutbuf_size,
482 const uint8_t *buf,
int buf_size)
488 const uint8_t *read_start = buf;
495 *poutbuf_size = buf_size;
509 for (curr = fpc->
headers; curr != best_child; curr = temp) {
512 "dropping low score %i frame header from offset %i to %i\n",
524 for (curr = best_child->
next; curr; curr = curr->
next)
550 while ((buf && read_end < buf + buf_size &&
564 read_end = read_end +
FFMIN(buf + buf_size - read_end,
572 "couldn't reallocate buffer of size %td\n",
579 read_end - read_start,
NULL);
588 start_offset =
FFMAX(0, start_offset);
591 if (nb_headers < 0) {
593 "find_new_headers couldn't allocate FLAC header\n");
600 if (buf && read_end < buf + buf_size) {
601 read_start = read_end;
622 read_start = read_end =
NULL;
654 return read_end - buf;