static int dnxhd_find_frame_end(DNXHDParserContext *dctx, const uint8_t *buf, int buf_size) { ParseContext *pc = &dctx->pc; uint64_t state = pc->state64; int pic_found = pc->frame_start_found; int i = 0; if (!pic_found) { for (i = 0; i < buf_size; i++) { state = (state << 8) | buf[i]; if (ff_dnxhd_check_header_prefix(state & 0xffffffffff00LL) != 0) { i++; pic_found = 1; dctx->cur_byte = 0; dctx->remaining = 0; break; } } } if (pic_found && !dctx->remaining) { if (!buf_size) /* EOF considered as end of frame */ return 0; for (; i < buf_size; i++) { dctx->cur_byte++; state = (state << 8) | buf[i]; if (dctx->cur_byte == 24) { dctx->h = (state >> 32) & 0xFFFF; } else if (dctx->cur_byte == 26) { dctx->w = (state >> 32) & 0xFFFF; } else if (dctx->cur_byte == 42) { int cid = (state >> 32) & 0xFFFFFFFF; if (cid <= 0) continue; dctx->remaining = avpriv_dnxhd_get_frame_size(cid); if (dctx->remaining <= 0) { dctx->remaining = ff_dnxhd_get_hr_frame_size(cid, dctx->w, dctx->h); if (dctx->remaining <= 0) return dctx->remaining; } if (buf_size - i + 47 >= dctx->remaining) { int remaining = dctx->remaining; pc->frame_start_found = 0; pc->state64 = -1; dctx->cur_byte = 0; dctx->remaining = 0; return remaining; } else { dctx->remaining -= buf_size; } } } } else if (pic_found) { if (dctx->remaining > buf_size) { dctx->remaining -= buf_size; } else { int remaining = dctx->remaining; pc->frame_start_found = 0; pc->state64 = -1; dctx->cur_byte = 0; dctx->remaining = 0; return remaining; } } pc->frame_start_found = pic_found; pc->state64 = state; return END_NOT_FOUND; }